Spells of exceptionally cold weather during December brought some of the lowest temperatures ever
recorded in Ireland, together with heavy snowfalls in places. There were also short periods of milder
weather, while overall the month was drier and sunnier than normal. Mean air temperatures for the month were up to six degrees lower than normal in places and it was the coldest December on record almost everywhere. It was also the coldest of any month at Dublin Airport, Casement Aerodrome and Mullingar, each with over 50 years of record. The lowest December air temperature ever measured in the country, -17.5°C, was recorded at the climatological station of Straide, Co. Mayo, on the morning of the 25th, while Casement Aerodrome’s minimum value of -15.7°C on the same day was the lowest value of any month ever recorded in the Dublin area. Ballyhaise’s mean monthly temperature of -1.4°C represents the lowest ever measured in the country for any month; the daily value of -9.4°C at the same station on the 21st was the lowest daily maximum on record. Between 14 and 24 days with air frost were recorded during the
month, over twice the normal number for December. Almost all parts of the country received snowfall at
times, with most persistent falls over Leinster. Although there was some thawing of lying snow around midmonth, by Christmas Day there was 27cm of snow lying at Casement Aerodrome. Monthly rainfall totals
(including snowmelt) were below normal everywhere; heaviest daily falls were on the 26th/27th in the south and southwest, as bands of heavy rain introduced much milder conditions at the end of the month. There were between 6 and 11 wetdays during the month at most stations (days with 1mm or more rainfall), around half of the December average. Sunshine totals varied widely, but it was a very sunny month in the west and southwest, where both Belmullet and Valentia Observatory recorded their sunniest December on record.
Meer te lezen hier;
http://www.met.ie/metadmin/useruploads/file/dec10sum.pdf
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