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June 2015
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Spring Climatological Summary

Posted: June 8th, 2015

 

MAM 2015 Summary

 

Meteorological spring is defined as the three-month period between March 1st and May 31st (MAM). Seattle’s 2015 MAM ended up being warmer than normal and drier than normal.

 

At 53.7º, Seatac’s three-month average temperature was 2.7º greater than the 30-year normal. Despite the warmth, not a single daily maximum temperature record was set over the period. 70º was first reached on April 19th, and 80º on May 9th. The highest temperature of the season was 82º on May 28th. On the low side, we haven’t seen anything below 40º since April 16th, and May only featured a single below normal low temperature (43º) on May 7th.

 

At 7.08″, rainfall fell 1.29″ inches short of normal. Looking more closely, had we not been hit by one significant atmospheric river during the ides of March, MAM would have been much, much drier. Said storm also represented the only daily precipitation record of the season with 2.20″ on March 15th.

 

State-wide, temperatures were well above average, ranking 119/121 (119th warmest out of 121 years), according to NOAA. Precipitation was below average, ranking 27th wettest out of 121 years. Within the state, as can be seen above, the most abnormally warm region was just east of the Cascade crest. All areas west of the crest produced our abnormal dryness.

 

NOAA Rankings

NWS Seatac Graphs and Records

 

JRH