September weather forecastVan Tassell, WY
September
Weather in September
The first month of the autumn, September, is still a warm month in Van Tassell, Wyoming, with an average temperature fluctuating between 75.6°F (24.2°C) and 55.2°F (12.9°C).Temperature
The onset of September results in a small decrease in the average high-temperature, moderately receding from a moderately hot 83.8°F (28.8°C) in August to a still warm 75.6°F (24.2°C). An average minimum temperature of 55.2°F (12.9°C) marks the month of September.Humidity
The average relative humidity in September in Van Tassell is 45%.Rainfall
In Van Tassell, in September, it is raining for 7.4 days, with typically 0.67" (17mm) of accumulated precipitation. In Van Tassell, during the entire year, the rain falls for 94.9 days and collects up to 10.39" (264mm) of precipitation.Snowfall
January through May, September through December are months with snowfall. September is the first month it typically snows. Throughout September, in the average 0.2 snowfall days, it receives 0.08" (2mm) of snow. Throughout the year, there are 43.5 snowfall days, and 15.63" (397mm) of snow is accumulated.Daylight
In September, the average length of the day in Van Tassell is 12h and 28min.On the first day of September, sunrise is at 6:22 am and sunset at 7:30 pm. On the last day of the month, sunrise is at 6:53 am and sunset at 6:38 pm MDT.
Sunshine
In Van Tassell, the average sunshine in September is 10.7h.UV index
In Van Tassell, Wyoming, the average daily maximum UV index in September is 4. A UV Index value of 3 to 5 symbolizes a medium health hazard from exposure to the Sun's UV rays for ordinary individuals.Note: The UV index of 4 in September translates into these instructions:
Exercise prevention - Warding off sunburn is urged. The intensity of the Sun's UV radiation during midday suggests reducing time spent outdoors. Employ a wide-brim hat for potent defense against up to 50% of UV rays. Be cautious! The UV radiation from the Sun can be magnified almost twofold by snow reflection.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Van Tassell, WY
- Average high temperature in September: 75.6°F
The warmest month (with the highest average high temperature) is July (85.8°F).
The month with the lowest average high temperature is December (32°F).
- Average low temperature in September: 55.2°F
The month with the highest average low temperature is July (64.2°F).
The coldest month (with the lowest average low temperature) is December (18.9°F).
Average pressure in September
Van Tassell, WY
- Average pressure in September: 29.93"Hg
The month with the highest atmospheric pressure is January (30.13"Hg).
The month with the lowest atmospheric pressure is June (29.84"Hg).
Average wind speed in September
Van Tassell, WY
- Average wind speed in September: 10.5mph
The windiest month (with the highest average wind speed) is April (11.9mph).
The calmest month (with the lowest average wind speed) is August (9.3mph).
Average humidity in September
Van Tassell, WY
- Average humidity in September: 45%
The month with the highest relative humidity is January (74%).
The month with the lowest relative humidity is August (44%).
Average rainfall in September
Van Tassell, WY
- Average rainfall in September: 0.67"
The wettest months (with the highest rainfall) are May and June (1.57").
The driest month (with the least rainfall) is January (0.28").
Average rainfall days in September
Van Tassell, WY
- Average rainfall days in September: 7.4 days
The month with the highest number of rainy days is May (13.4 days).
The month with the least rainy days is December (2.7 days).
Average snowfall in September
Van Tassell, WY
- Average snowfall in September: 0.08"
The month with the highest snowfall is March (2.56").
The months with the least snowfall are June, July and August (0").
Average snowfall days in September
Van Tassell, WY
- Average snowfall days in September: 0.2 days
The month with the highest number of snowfall days is February (8 days).
The months with the least snowfall days are June, July and August (0 days).
Average daylight in September /
Average sunshine in September
Van Tassell, WY
- Average daylight in September: 12h and 30min
The month with the longest days is June (Average daylight: 15h and 18min).
The month with the shortest days is December (Average daylight: 9h and 6min).
- Average sunshine in September: 10h and 42min
The months with the most sunshine are July and August (Average sunshine: 11h and 48min).
The months with the least sunshine are February and December (Average sunshine: 6h and 12min).
Average sunshine days in September
Van Tassell, WY
- Average sunshine days in September: 19.7 days
The month with the most sunshine days is December (22.9 days).
The month with the least sunshine days is June (12.3 days).
Average UV index in September
Van Tassell, WY
- Average UV index in September: 4
The months with the highest UV index are June, July and August (UV index 6).
The months with the lowest UV index are January, February, November and December (UV index 2).
Average cloud cover in September
Van Tassell, WY
- Average cloud cover in September: 17
The month with the most cloud cover is February (Cloud cover 36).
The month with the least cloud cover is August (Cloud cover 16).
Average visibility in September
Van Tassell, WY
- Average visibility in September: 6mi
The months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
The months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
