February 2016 ranked among the warmest 15% and the driest 35% of February’s at the Boise airport.
Temperatures on most days were more typical of March and early April. Highs reached 60°F or above on four days. The 65°F on the 26th was the warmest day since the 70°F on October 25 2015. Lows were above freezing on eleven nights, including every night from the 14th through the 21st. Despite the unseasonably warm weather, no records were equaled or broken.
Only four days averaged below normal, including the 1st through the 3rd, due to a deep cold upper level trough, and the 23rd, when clear skies and dry air allowed the temperature to drop to 24°F in the pre-dawn hours.
Measurable precipitation fell on only five days. The only measurable snowfall was 0.7 inch on the 4th. An average February has 2.9 inches of snow.
The pattern responsible for the relatively warm and dry February was a persistent warm upper level high pressure ridge, which established itself following the departure of the upper level trough. There was enough flow through the ridge to allow Pacific weather systems to cross our area, but they dropped most of their rain and snow on the mountains of northern and central Idaho.
Thunderstorms accompanied a cold front which crossed the Boise area around 5 am on the 18th. Some locations even reported small hail. Early morning thunderstorms, and winter thunderstorms, are rare in
The front was followed by winds which gusted to 41 mph at the Airport.
Another cold front crossed the Boise area around 5 pm on the 19th, bringing brief heavy rain showers and a wind gust of 47 mph.
Fog and low clouds were observed on eleven days, including dense fog on four of those days. The fog usually dissipated in the afternoons.