September saw temp records, but month was cooler overall

Oct 10, 2017 From staff reports

A recap of September weather shows the month was slightly cooler than normal while also meeting or exceeding several high-temperature records, according to the National Weather Service.

The warmest thermometer reading of the month was seen Sept. 3, when temperatures reached 92 degrees, tying the previous record for that day set in 2007.

A new record high was set Sept. 12, when the temperature reached 88 degrees, breaking the previous record of 87 degrees set in 2004.

Another record was tied Sept. 11, when temperatures reached 87 degrees - the same as in 2004.

Despite the warm days this year, the record high for September remains in place, at 94 degrees set Sept. 5, 2013.

The coldest thermometer reading of the month was 34 degrees Sept. 26, well above the record low temperature for the month of 21 degree set Sept. 27,1996.

The average temperature for September 2017 was 57.5 degrees, and the departure from normal was -.9 degree.

Much moisture

The NWS says most of the state received "copious amounts" of precipitation last month. In fact, the agency said, this will be the second September in a row that experienced record amounts of precipitation.

"This certainly aided in keeping wildfires suppressed across the area," the NWS report said.

In Fremont County several one wildfire in particular, covering up to 100 acres above Fort Washakie, was stopped by rain that started Sept. 15. That day saw the wettest 24-hour period of the month; the NWS recorded .68 of an inch at Riverton Regional Airport - a new record.

The previous record for the day was .54 inch set in 2013.

Another record was set Sept. 22 when .43 inch of rain fell, breaking the previous record for the day of .38 inch set in 2016.

Overall Riverton was "much wetter than normal" in September, the NWS said.

At Riverton Riverton Regional Airport there was an average of 1.73 inches of precipitation for the month - 192 percent of normal for a .83-inch departure from usual.

It was the third-wettest September on record.

The wettest September on record at the airport recording stationwas in 2013, when 3.01 inches of rain fell.

The record driest September was in 2010, when only .01 inch of precipitation fell.