Wednesday 4 August 2010

July weather summary

July was the first month of 2010 which was dominated by weather patterns associated with Atlantic depressions. Slow-moving frontal systems brought significant falls of rain at times, while most days were cloudy but mild, with south to southwesterly winds.

Rainfall totals for July were above normal everywhere and were more than twice the average at some stations; it was the fourth successive July with rainfall totals much in excess of normal over most of the country. Unlike previous years, however, the relatively dry weather of the preceding months of 2010 and consequent high soil moisture deficits helped to prevent significant flooding during this month. Claremorris had its wettest July since records began there in 1950, while its daily fall of 56mm on the 10th was also a record for the month at the station. Belmullet’s total of 140mm equalled its previous highest July value, recorded in 1988. Heavy falls in the period around the middle of the month were often associated with thunderstorms. Most stations recorded between 15 and 21 wetdays during the month (days with 1mm or more rainfall), compared with the normal range for July of between nine and 13.

Mean monthly air temperatures were near normal in the south, but were around half a degree higher than normal at most stations. As shown by the accompanying temperature charts, there was little variation in either daily maximum or minimum values during the month, with few very warm days. Mean maximum temperatures were close to normal, but the generally cloudy conditions kept mean minimum values over a degree higher than normal generally. July sunshine totals were below normal everywhere, the first relatively dull month of 2010.
Valentia Observatory’s sunshine total of only 85 hours was among the five lowest for July in over a century of records at the station and was also its lowest of any month so far in 2010. The sunniest days of the month were during the first week and on the 22nd.
Source - Met Eireann

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