Helo Gyfeillion y Gwanwyn,

Hoffwn rannu rhigwm doniol gan R o Thorn Primary School: "If I was a dog and you were a flower I’d lift my leg and give you a shower!"

Ysgol Clocaenog: Heddiw, rydym wedi gweld bod ein cennin pedr yn dechrau tyfu. Mae cennin pedr K wedi tyfu 1.5cm. Mae rhai ohonynt dal heb ddechrau eto. Athro'r Ardd: Wel, rwy'n falch o glywed bod eich Cennin Pedr wedi cychwyn tyfu. Mae'n swnio fel bod bwlb K yn tyfu yn gyflym iawn! Daliwch ati gyda'r gwaith da Ysgol Clocaenog!

Thorn Primary School: What happens to the plants after they have flowered? Do they die? Prof P: Hi Thorn Primary School. This is a very important question. Your bulbs won’t die after they have flowered! The leaves of your plant make food and the roots absorb water. When your flower dies the bulb stores all remaining food and water inside itself ready for next Autumn. Your teacher has information on how to care for your bulbs after your flowers die, and I will blog about it closer to the time. But this won’t happen until the end of Spring – so enjoy your flowers while they are here!

Skelmorlie Primary School: This week we have had a lot of snow and sleet in our weather. It has been really cold so we have had to look out for ice when we are playing too. In our water gauge this week, there was around 13 mm of water and 37 mm of ice/snow. Prof P: Hi Skelmorlie Primary School. I’m glad to hear you are being careful when you are outside, the weather can cause dangerous conditions! I’m assuming you melted the 37mm of snow to 13mm of water. Was there less water than you thought there would be? This is because water expands when it freezes and evaporates when it heats! I’d like to thank you for all the weekly comments you have sent me – you are definitely Super Scientists!

St. Ignatius Primary School: Professor Plant we missed some recordings this week due to the bad weather here. Our teacher decided it was not safe enough for us to go out and collect the recordings. Today we had a big piece of ice in our rainfall gauge so if that melted our rainfall would be more. The raifall gauge was also this full as it includes the 3 days we didn't take recordings. St. Ignatius Primary 4. Prof P: Hello St Ignatius Primary 4. Not to worry about missing some recordings due to bad weather – if it’s icy it’s better to stay warm and safe! As for the block of ice, you are not the only school to have had this problem. If this happens again please take your rain gauge inside and wait for the ice to melt. Then record the water level as rain fall on your weather chart!

Morningside Primary School: We brought our rain gauge in on Monday as it was full of snow and let it melt before we took the measurement. Prof P: Well done Morningside Primary School, you really are Super Scientists! I hope you enjoyed the experiment. I always try to guess how much water there will be when the ice melts!  Other schools have had the chance to do this experiment too, including Corshill Primary School.

Chryston Primary School: We are terribly sorry that we could not finish our records last week. We have been very busy with our Scottish afternoon and the weather here has been horrible. Hopefully we will finish our records next week. Prof P: Not to worry Chryston Primary School. Scottish afternoon sounds exciting! I hope you had a good week!

Thorn Primary School: We had lots of snow this week as well as lots of ice! We have no recording for Thursday as our school was closed due to the ice making it unsafe for staff and children to arrive. Prof P: Not to worry Thorn Primary School, other schools were unable to complete their records due to bad weather too! And lots of schools have reported snow, including: Woodlands Primary School, St. Brigid's School, Ysgol Hiraddug, Abbey Primary School, Manor Road Primary School, Rivington Foundation Primary School, Bickerstaffe CE Primary School and Balshaw Lane Community Primary School.

Our Lady of Peace Primary School: It has been very windy,snowy and icy. Two girls fell today at playtime and lunchtime on the ice and hurt themselves. It snowed last Tuesday and Wednesday. The two girl that fell are the girls that wrote this. Prof P: Hello, I’m sorry to hear you fell on the ice! I hope you weren’t badly hurt! I hope children at other schools take note and that everyone is extra careful when outdoors in this weather!

Ysgol Y Plas: Dear professor plant I thought you would like to know that nineteen bulbs in the flower bed have been growing and sixteen in the pots have started as well. From C. Prof P: Hi C, that’s great news! Other schools have reported new shoots too, including Skelmorlie Primary School!

Tongwynlais Primary School: We have no rain records for monday and tuesday as a few of our fellow pupils have been playing with our rain gage. We hope we can collect more accurate measurements next week. Prof P: Thank you for letting me know Tongwynlais Primary School. Other schools have been having problems with their rain gauges too. Including Euxton Church of England Primary School whose rain gauge has been repeatedly knocked over by football players! They have found a new location for their rain gauge now.

Darran Park Primary: I have got a new friend doing this job now - he enjoys doing it !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! Prof P: Haha, well I’m guessing that not everyone at Darran Park Primary is enjoying this project! I hope your new friend can show you how much fun science can be and that you come to enjoy the project as much as he does!

The Blessed Sacrament Catholic Primary School: It has been really icy in the mornings but the daffodil shoots are getting taller. F. Prof P: Good to know F. You must be looking after them very well!

Bancyfelin: 1 mm of snow fell on Thursday 29th of January. This means that 4mm of rain + 1mm of snow fell on this day. Prof P: Well done Bancyfelin. I assume you measured the snow using snow sticks? I see you recorded 4mm of rain, so I assume the snow melted in your rain gauge!

Baird Memorial Primary School: We are surprised by the changes that occurred within the temperature side of things. The changes were dramatic. Prof P: Hi Baird Memorial Primary School. You are right, there is quite a jump in your temperature readings from -1°c on Thursday to 11°c on Friday! This shows how temperamental the weather can be. Drops in temperature are often caused by cold winds, clouds and precipitation (rain and snow).

Ysgol Nant Y Coed: We enjoyed doing we like doing it very much its so FUN!!!! This is are last time doing it :(wahhhhhhhh we wish we could do it again-S and A. Prof P: Hi S & A! I’m glad you are enjoying the project and I hope you have learnt a lot! There are other scientific experiments you can take part in. I’m guessing its someone else’s turn to take the temperature and rain fall readings for this project now. But you could easily do a similar experiment at home! The MET Office have a Weather Observation Website (WOW) where they ask people to document temperature reading from their area. This information then helps Meteorologists to build a clearer picture of weather patterns across the UK. You can take part here: http://wow.metoffice.gov.uk/weather/manual .

Daliwch ati Gyfeillion y Gwanwyn!!

Athro’r Ardd

Helo Gyfeillion y Gwanwyn,

Diolch i bawb wnaeth yrru data tywydd ata i'r wythnos ddiwethaf. Yn enwedig y rhai ohonoch wnaeth yrru jôcs – daliwch ati, mae nhw’n gwneud i mi chwerthin!

Roedd rhai o sylwadau’r wythnos yma yn dweud bod y tymheredd yn codi a’r dyddiau’n mynd yn hirach, sy’n esgus perffaith i mi siarad rhywfaint am y tymhorau!

Mae yna bedwar tymor mewn blwyddyn: gaeaf, gwanwyn, haf a hydref. Mae hi’n dal yn aeaf ar hyn o bryd, y tymor oeraf.

Mae’r gwanwyn yn dechrau o gwmpas Mawrth yr 20fed (Cyhydnos y Gwanwyn) a dyma’r tymor lle bydd y rhan fwyaf o blanhigion yn blodeuo ac anifeiliaid bach yn cael eu geni wrth i’r tywydd gynhesu. Mae ŵyn bach yn y caeau yn arwydd da bod y gwanwyn wedi cyrraedd!

O fis Mehefin tan fis Medi bydd hi’n haf – y dyddiau’n hir a’r tywydd yn gynnes. Yn lwcus i chi, byddwch yn cael gwyliau hir o’r ysgol!

Bydd yr hydref yn gafael o ddiwedd Medi ymlaen – y dyddiau yn byrhau, y tywydd yn oeri, a’r dail yn troi’n oren, coch a brown cyn syrthio o’r coed. Daw’r gaeaf unwaith eto ym mis Rhagfyr a bydd yn aros efo ni tan ganol Mawrth.

Ydych chi’n gwybod pam ein bod yn cael tymhorau? Beth sy’n achosi i’r tywydd newid mor ddramatig yn ystod y flwyddyn? Mae’n digwydd achos bod y Ddaear yn troi o amgylch yr Haul ar ongl. Mae’r llun isod yn dangos y Ddaear a’r Haul. Mae’r Ddaear yn cylchdroi ar echel (dychmygwch linell yn cysylltu Pegwn y Gogledd â Phegwn y De) wrth symud o amgylch yr Haul.

Mae’n cymryd 365 diwrnod i’r Ddaear deithio unwaith o amgylch yr Haul. Hyd blwyddyn ar blaned yw’r amser mae’n gymryd i deithio o amgylch ei seren unwaith. Felly mae blwyddyn ar y Ddaear yn para 365 diwrnod.

Y Tymhorau (gan wefan BBC Bitesize)

Mae’r llun uchod yn dangos llwybr y Ddaear o amgylch yr Haul. Yr echel yw’r llinell goch trwy’r ddau begwn. Mae’r echel ar ongl wahanol i lwybr y Ddaear o amgylch yr Haul (y llinell wen doredig). Mae hyn yn golygu ein bod ar ongl fymryn yn wahanol i’r Haul bob dydd. Dyma sy’n achosi’r newid yn hyd y dydd. Mae dyddiau byrrach (gaeaf) yn golygu llai o olau a llai o wres, sy’n gwneud y gaeaf yn oerach. Mae dyddiau hirach (haf) yn golygu mwy o olau a gwres, sy’n ei gwneud yn gynhesach!

Mae’r DU yn ‘Hemisffer y Gogledd’ sy’n golygu ein bod yn nes at Begwn y Gogledd nag at Begwn y De. Yn y llun, mae Pegwn y Gogledd (y llinell goch sy’n pwyntio am i fyny) yn gwyro i gyfeiriad yr Haul ym mis Mehefin ac oddi wrth yr Haul ym mis Rhagfyr. Yr ongl hon sy’n achosi’r newid yn hyd y dyddiau wrth i’r Ddaear droi o amgylch yr Haul.

Mae gwledydd eraill yn profi’r newidiadau hyn ar wahanol adegau. Yn Awstralia mae’n haf ym mis Rhagfyr! Ac yng Ngwlad yr Iâ mae’n olau dydd am ddyddiau ar y tro yn yr haf, ac yn dywyll am ddyddiau yn y gaeaf... dychmygwch yr Haul yn tywynnu am hanner nos!

Daliwch ati Gyfeillion y Gwanwyn,

Athro’r Ardd

Helo Gyfeillion y Gwanwyn,

Mae yna arolwg gwyddonol cyffrous yn digwydd y penwythnos hwn, ac mae angen eich help chi! ‘The Big Garden Birdwatch’ yw’r enw a’r RSPB - elusen sy’n helpu i edrych ar ôl ein bywyd gwyllt - sy’n trefnu. Gallwch chithau helpu drwy gofrestru ar-lein yma: https://www.rspb.org.uk/birdwatch/. Wedi gwneud hynny, treuliwch awr dros y penwythnos hwn yn cofnodi’r adar sy’n dod i’ch gardd neu lecyn gwyrdd yn agos i’ch cartref. Bydd y pecyn gwybodaeth ar wefan RSPB yn eich helpu i adnabod yr adar! Wedyn, rhowch eich canlyniadau ar wefan RSPB fel eu bod nhw yn gallu eu hychwanegu at yr arolwg mawr cenedlaethol ar boblogaethau adar, sy’n ceisio darganfod mwy am hynt a helynt ein ffrindiau pluog!

Mae’r ‘Big Garden Birdwatch’ wedi bod yn mynd ers 1979! Gallwch ddod o hyd i ganlyniadau blaenorol yma: https://www.rspb.org.uk/birdwatch/previous-results/. Mae arolwg blynyddol a chenedlaethol yn ffordd wych o sylwi ar newidiadau mewn poblogaethau adar. Mae hyn yn bwysig, oherwydd pan fyddwn yn gwybod pa adar sy’n mynd yn brin, gallwn ddod i ddeall pam mae hyn yn digwydd a cheisio helpu’r adar i oroesi. Mae’r ddrudwen yn enghraifft o hyn. Ers i’r ‘Big Garden Birdwatch’ ddechrau yn 1979, mae poblogaeth y ddrudwen wedi lleihau 80%. Mae’r RSPB wedi bod yn codi ymwybyddiaeth o’r pethau y gallwn ni wneud i helpu’r adar hyn, fel torri’r lawnt mewn rhannau o’r ardd er mwyn i’r ddrudwen allu cyrraedd eu bwyd, sef trychfilod a phryfed bach sy’n byw yn y pridd.

Drudwy yn y Gaeaf (llun drwy garedigrwydd wefan yr RSPB).

Dyma rai syniadau ar sut i ddenu adar i’r ardd: http://www.rspb.org.uk/news/387868-top-10-bird-feeding-tips-this-winter. A dyma weithgareddau difyr yn ymwneud ag adar: https://www.rspb.org.uk/birdwatch/family-fun/.

Bydd Sain Ffagan Amgueddfa Werin Cymru ac Amgueddfa Genedlaethol Caerdydd yn cynnal gweithgareddau ‘Big Garden Birdwatch’ y penwythnos hwn! Os ydych chi eisiau ymuno, mae mwy o fanylion yma:

Caerdydd           Sain Ffagan

Diolch yn fawr i bawb wnaeth yrru data tywydd ata i yr wythnos ddiwethaf. Rwy’n edrych ymlaen i weld os yw hi wedi bod yn gynhesach neu’n oerach yr wythnos hon ac os yw hi wedi bwrw eira neu gesair! Cofiwch, os wnewch chi yrru’ch data a gadael i mi wybod ar-lein pan fydd eich planhigion wedi blodeuo, byddwch yn derbyn gwobr Gwyddonydd Gwych a bydd cyfle i chi ennill Taith Natur!
 
Daliwch ati Gyfeillion y Gwanwyn!

Athro’r Ardd

Helo Gyfeillion y Gwanwyn,

Rwy'n falch i adrodd yr arwyddion cyntaf o Wanwyn yn Amgueddfa Genedlaethol Caerdydd! Mae'r Cennin Pedr wedi cychwyn tyfu yn yr Amgueddfa!

Cennin Pedr yn tyfu yn Amgueddfa Genedlaethol Caerdydd

Hoffwn rannu jôc gan St Paul's Primary School. Wnaeth hyn wneud i mi chwerthin! Os oes gennych jôcs i wneud a gwyddoniaeth, natur neu (yn arbennig) planhigion, yna plîs anfonwch nhw i mewn!

Q.        Why was the computer cold?
A.        Because it left its windows open!

Coppull Parish Primary School: Friday's rain measurement may be misleading as it was not water but hailstones! Professor P: Hi Coppull Parish Primary, I always like to watch hail but hate to get caught in it! The Blessed Sacrament Catholic Primary School also reported that their rain gauge filled with hail stones! The readings shouldn’t be miss-leading if you do the same as we do to measure snow. If it hails again, take the rain gauge inside and wait for the hail to melt, then record the water level as rainfall. 

Thorn Primary School: Hi Professor Plant, We have had snow this week! It snowed on Tuesday night and a little bit on Wednesday morning then for most of the day on Friday. Is there anything we need to do to care for our bulbs during snowy weather? Most of our bulbs now have shoots. Prof P: Hi Thorn Primary School, I hope you enjoyed the snow and it wasn’t too cold! Your plants are quite sturdy and will be Okay outside in this weather. The soil provides a warm layer for the bulb and protects it from the cold. You might notice that daffodils planted in the ground are growing quicker than those in your plant pots. That is because the soil is thicker around bulbs planted in the ground and so is providing more warmth. This shows how important warmth is to growing plants and why changes in the climate have an effect on when plants grow and flower!

St. Ignatius Primary School: Dear, Professor Plant. We brought our plants in over the Christmas holidays and when we came back we noticed some of the shoots had come up. We are so excited about this but hope it's not too soon for them to be growing. Also we have had some really windy and wet weather so some of or plants had fallen over. We think they are ok and we will keep an eye on them. Thanks P4 St. Ignatius. Prof P: Hi P4 at St. Ignatius Primary! I’m sorry to hear the wind blew over your plants, but am very glad that they are all Okay! It’s great that your plants have started growing and don’t worry, it’s not too early! Other schools have reported their first shoots too, including St. Brigid's School, Bickerstaffe CE Primary School, Stanford in the Vale Primary School and Freuchie Primary School. Silverdale St. John's CE School have informed me that their shoots are now 3cm high! I'm happy to report that my plants have started to grow too!

The Blessed Sacrament Catholic Primary School: Over the holidays it had rained so much that the rain gauge had filled up and tipped to one side so some of the water had tipped out. We are really enjoying collecting the weather data and watching the shoots growing from the bulbs. Thank you for sending them to us. K and J. Prof P: Hi K & J, Thank you for letting me know that your rain gauge had tipped over and for monitoring the weather so well! You must have had a lot of rain! I’m glad you are taking good care of the bulbs and watching the shoots closely. Other schools have had similar problems with their rain gauges on coming back from the holidays. Rivington Foundation Primary School and Llanishen Fach C.P School reported that their rain gauges were overflowing on their first day back! 

Ysgol Nant Y Coed: There should be rainfall on Wed and Thurs but the rain gauge had been tipped over. We're very sorry. We've now put a second, back up rain gauge out so it shouldn't happen again. C and E. Prof P: Hi Ysgol Nant Y Coed, don’t worry about your rain gauge falling over but thank you for letting me know! And well done for thinking of a solution and putting out a second rain gauge! St Laurence CE Primary School have been having the same problem, maybe they could try using a back-up rain gauge too! Or, they could secure their rain gauge (maybe by tying it to a fence or post) or move it to an area where it might be more sheltered from the wind but will still be able to collect rainfall! 

Darran Park Primary: Sorry for not doing it for a couple of weeks but we couldn’t find this page. I really enjoyed the Christmas card and we will use the coupon to improve our school garden which we also use as a learning area. Prof P: Hello Darran Park Primary! The gift vouchers were from our sponsors at the Edina Trust, and I’m glad to hear you are putting them to good use. As for being late recording your readings, that’s fine, you can still upload readings for previous weeks! 

Darran Park Primary: Professor Plant we have checked our crocuses and our daffodils and some are starting to get bigger and healthier. I enjoyed the Christmas card you gave me. I had to photocopy it so my friend Brandon and I could have one each, we are going to use the £10 voucher on our school garden. We really enjoy checking the temperature and the plants and we really enjoy talking to you and please could you send a letter telling us more information about your museum and more information on plants and more about history. Prof P: Hello Darran Park Primary, what a lovely comment, thank you very much! I would like to see a photo of your school garden when the flowers start to bloom! I’m glad to hear that you are enjoying the project and are looking after your plants so well. I will of course send a letter with some more information about National Museum Wales. You can also explore the seven Museum sites online: http://www.museumwales.ac.uk/. The closest to you are St Fagans National History Museum, which run regular out door nature activities and National Museum Cardiff, which has wonderful galleries exploring Natural History. There is an exciting exhibition on at the moment which I think you would like: http://www.amgueddfacymru.ac.uk/digwyddiadau/?id=7233. 

Keir Hardie Memorial Primary School: We did not get the chance to check the weather records for the rainfall because the weather was rainy and snowy all week so our interval and lunchtimes were indoor. We were able to record the temperature because Miss Nicholls did the reading at the playground door. From Primary 4/5. Prof P: Not to worry Keir Hardie Memorial Primary, thank you for letting me know why there are no rainfall records and well done for recording the temperature! Other schools have reported colder weather, strong winds and storms! These include Arkholme CE Primary School, St. Brigid's School, Ysgol Rhys Prichard, St. Paul's Primary School, Maes-y-Coed Primary and Morningside Primary School. Stanford Gardening Club at Stanford in the Vale Primary have also noticed changing patterns through the week, reporting ‘very cold weather, snow Tuesday, rain Thursday and high winds during the week. Then today Friday the sun is out!’

Daliwch ati Gyfeillion y Gwanwyn, 

Athro’r Ardd

Shwmae Gyfeillion y Gwanwyn, 

Diolch am anfon cofnodion yr wythnos ddiwethaf. Mae hi’n bendant yn dechrau oeri, ac mae rhai ohonoch chi wedi gweld eira hyd yn oed! Dyma pam dwi am esbonio sut mae meteorolegwyr (gwyddonwyr tywydd) yn mesur eira. 

Mae mesur faint o law sy’n disgyn yn hawdd o’i gymharu â mesur faint o eira sy’n disgyn. Fydd eira ddim yn bihafio! Bydd yn aml yn cael ei chwythu gan y gwynt ac yn lluwchio, sy’n golygu bod yr eira’n ddwfn mewn mannau ond yn llawer llai dafliad carreg i ffwrdd. Oherwydd bod yr eira’n disgyn yn anghyson, bydd y mesuriadau o’r llefydd yma’n anghywir! Dyna pam mae’n rhaid mesur mewn mannau gwastad, agored ymhell o ble fydd eira’n lluwchio. Bydd eira hefyd yn chwarae gemau gyda’r Meteorolegwyr sy’n ceisio ei fesur – bydd yn toddi’n ddŵr, cyn rhewi fel iâ. Felly dyw’r eira sy’n cael ei fesur ddim bob tro yn cyfateb i faint o eira sydd wedi disgyn. Mae eira newydd yn disgyn ar ben hen eira hefyd, ac mae’n anodd dweud faint o eira sydd wedi disgyn o un diwrnod i’r llall. 

Mae’n rhaid i’r meteorolegwyr gofio holl driciau’r eira a meddwl am ffyrdd i ddarganfod faint o eira sydd wedi disgyn. Byddan nhw’n edrych ar gwymp eira (faint o eira sy’n disgyn mewn diwrnod) a dyfnder eira (cyfanswm dyfnder yr eira, hen a newydd). Un ffordd o fesur cwymp eira yw gyda ffon bren. Bydd y meteorolegwr yn gosod y pren mewn lleoliad agored lle na fydd eira’n lluwchio ac yn mesur yr eira bob chwech awr. Drwy glirio’r eira o’r pren ar ôl ei fesur, dim ond eira’r diwrnod hwnnw fydd yn cael ei fesur, a gall y gwyddonydd ddweud faint o eira sydd wedi cwympo ar y diwrnod hwnnw. 

Gallwn ni hefyd fesur eira wedi toddi ar ffurf dŵr. Gallwch chi felly ddefnyddio’ch mesurydd glaw i fesur cwymp eira. Os taw dim ond ychydig o eira sy’n cwympo, bydd yn toddi yn y mesurydd beth bynnag, ond os yw hi’n bwrw’n drwm, ewch â’r mesurydd i mewn ac aros iddo doddi’n ddŵr. Gallwch chi wedyn fesur y dŵr fel rydych chi wedi’i wneud bob wythnos, a’i gofnodi fel glawiad yn eich cofnodion tywydd. 

Os oes eira ar lawr a bod digon o amser i arbrofi, beth am fynd ati i fesur dyfnder yr eira? Y cyfan sydd ei angen arnoch chi yw pren mesur (neu pren eira os ydych chi am siarad fel gwyddonydd gwych!). Gwthiwch y pren i’r eira tan ei fod yn cyffwrdd y ddaear a chofnodi pa mor ddwfn yw’r ddaear fesul milimedr. Rhaid i chi fesur o arwyneb gwastad (fel mainc) mewn lle agored lle nad yw’r eira’n lluwchio. Rhaid i chi gofnodi o leiaf tri mesuriad i gyfrifo dyfnder cyfartalog yr eira lleol. Cyfrifwch y cyfartaledd drwy adio’r cofnodion gwahanol a’u rhannu gyda’r nifer o gofnodion. Os ydw i’n cofnodi tri dyfnder o 7cm, 9cm a 6cm, rhaid i fi adio pob rhif (7 + 9 + 6 = 22) cyn rhannu gyda 3 (22 / 3 = 7.33). Dyfnder cyfartalog yr eira felly yw 7.33cm. 

Mae gorsafoedd tywydd fel y Swyddfa Dywydd (MET Office) wedi troi at dechnoleg i ddyfeisio dulliau newydd o fesur dyfnder eira. Edrychwch ar y llun o un o orsafoedd eira’r Swyddfa Dywydd. Mae nhw’n defnyddio synwyryddion laser i fesur dyfnder yr eira ar yr arwyneb gwastad. Gall meteorolegwyr gasglu data o bob cwr o’r wlad wrth wasgu botwm – llawer haws a mwy dibynadwy nag anfon pobl allan i’r oerfel gyda phren eira! Mae pob un o orsafoedd eira’r Swyddfa Dywydd i’w gweld ar y map – oes un yn agos atoch chi? 

Llun o Synhwyrydd Dyfnder Eira y Swyddfa Dywydd.

(Wefan y Swyddfa Dywydd)

Map o leoliadau Synwyryddion Dyfnder Eira y Swyddfa Dywydd – oes un yn agos atoch chi?

(Delwedd o wefan y Swyddfa Dywydd)

Os yw hi wedi bwrw eira, cofiwch fesur y cwymp gyda’r mesurydd glaw neu’r dyfnder gyda phren eira a nodi’r canlyniadau fel ‘Sylwadau’ wrth uwchlwytho eich cofnodion wythnosol. Bydd yn ddiddorol cymharu dyfnder yr eira â chwymp yr eira yn y mesurydd glaw! 

Daliwch ati Gyfeillion y Gwanwyn, 

Athro’r Ardd