Many pupils asked some very interesting questions. Which just shows, what good scientists they are! I hope these answers are useful to you all.

Thanks, Professor Plant

Q.Why does the rainfall go up in 10mm on the on-line form?
If the rainfall went up in 1’s rather than 10’s the on-line selection boxes would be too long and very difficult to use. Please round-up your numbers to the nearest 10mm as Pupils from Ysgol Llangewydd, Ysgol Iau Hen Golwyn, Ysgol Llanbrynmair and Brackla Juniors did.

Q. How do we record zero rainfall?
A. Very good question! Thanks for reporting this mistake - Ffynnon Gynydd School & St. Pardarn’s Primary! I have up-dated the website and now you can record zero. I have also gone into the data base and made the relevant alterations.

Q. Why do we measure rainfall in mm and not ml?
A. Traditionally, weather is measured in mm and not ml. If we all measured in ml we would have to have exactly the same size cyliners. When you measure in mm’s you can measure using any size pot (as long as it has straight edges) - the height of the water in the pot will always be the same. To test this - leave two different sized pots - next to each other - out in the rain. When you measure the rainfall in mm’s there will be the same height of water in each pot.

Q. What if you get more than 100mm’s of rain?
In November, Hawthorn Primary got 300 ml’s of Rain! They selected 100mm in the selection box and noted that the days when there were more than 100mm’s of rain in the comments box. This is the correct way to record extremely high amounts of rain.

Q. What if the rain blows over the rain cylinder?
A. This happened to Ysgol Esgob Morgan. They noted that it had been raining in the comments box - which is very useful.

Q. What if we get frosty weather, gails or snow?
A. All weather decriptions are very useful. Please record them in the comments box as Gwenfro Juniors did when they had over-night frost in November.

Q. What time should we record the weather records and should all schools record at the same time - to ensure a fair test?
A. This question came from Prendergast Juniors. In an ideal world all schools would reocord at exactly the same time each day, but because school timetables vary this isn’t always possible. Each school should try to record in the afternoon at roughtly the same time each day.

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