Robbinston News

 

Kathy Mekelburg

 

September Weather Summary: Record warmth dominated for the first three weeks of September, but then temperatures ran below normal during the final week.  It was still the third warmest September in 23 years of record with 1999 and 2015 being warmer. The monthly mean temperature of 60.9 degrees was 2.0 degrees above normal. Maximum was 85 degrees on the 9th, minimum was 37 degrees on the 30th. There were 4 days with maximums 80 degrees or higher. There were 133 heating degree days or 62 below normal. Total since July stands at 163 or 113 below normal. There were 30 cooling degree days or 11 above normal. total for the season stands at 297 or 104 above normal. This is the second highest season total on record; only 1999 had more with 305 cooling degree days.

September was very dry, the second driest on record at 1.70 inches or 3.11 inches below normal. Only 2011 with 1.60 inches was drier. Total precipitation since January stands at 33.50 inches or 5.03 inches below normal. Maximum daily amount was .590 inches on the 18th and 23rd. There were 11 days with measurable rainfall. There was enough rain to keep lawns green, but stream flow was the lowest since 2001 (15 years)! This was due mainly to the dry spring and hot summer.

 

With the lack of rain came high barometric readings. The monthly mean barometer of 30.10 inches established a new September high beating 30.08 inches set in 2008! Highest was 30.59 inches on the 30th, while the lowest was 29.71 inches on the 11th. Mean relative humidity was 80.5 per cent; the monthly low was 36 per cent. Prevailing winds were southwest with an average speed of 2.2 miles per hour. Peak gust was 28/sw. on the 11th. There were 6 clear days, 13 partly cloudy days, and 11 cloudy days. Daytime sky cover averaged 63 percent. There were 9 days with dense fog. This tied the September high record set in 1998 and 2010. Thunder occurred on the 1st and 11th.