Contents
- Weather in September
- Frequently asked questions
- Average temperature in September
- Average pressure in September
- Average wind speed in September
- Average humidity in September
- Average rainfall in September
- Average rainfall days in September
- Average snowfall in September
- Average snowfall days in September
- Average daylight in September
- Average sunshine in September
- Average sunshine days in September
- Average UV index in September
- Average cloud cover in September
- Average visibility in September
Weather in September
Temperature
With September's arrival, Van Norman sees a decrease in average high-temperatures, moving from a moderately hot 82.6°F (28.1°C) in August to a pleasant 71.2°F (21.8°C). Van Norman observes an average low-temperature of 54.9°F (12.7°C) during September nights.Humidity
The average relative humidity in September is 44%.Rainfall
In Van Norman, in September, during 8.7 rainfall days, 1.1" (28mm) of precipitation is typically accumulated. In Van Norman, during the entire year, the rain falls for 104.8 days and collects up to 13.03" (331mm) of precipitation.Snowfall
Months with snowfall are January through May, September through December. September is the first month it typically snows. Throughout September, in the average 0.1 snowfall days, it receives 0.04" (1mm) of snow. Throughout the year, in Van Norman, there are 58.4 snowfall days, and 21.1" (536mm) of snow is accumulated.Daylight
In Van Norman, the average length of the day in September is 12h and 32min.On the first day of September, sunrise is at 6:25 am and sunset at 7:44 pm. On the last day of the month, sunrise is at 7:04 am and sunset at 6:46 pm MDT.
Sunshine
The average sunshine in September in Van Norman is 10.1h.UV index
The average daily maximum UV index in September is 4. A UV Index reading of 3 to 5 represents a moderate threat to health from unsafe exposure to UV radiation for the ordinary person.Note: In September, a daily maximum UV index of 4 leads to the following instructions:
Ensure safety - Recommendations to avert sunburn are presented. Limiting exposure to the direct Sun during midday hours can help prevent harmful UV radiation effects. Sun protection is enhanced with clothing that boasts a tight weave yet offers a loose fit. Heed this! Snow reflection can almost augment the UV radiation of the sun by double.
Frequently asked questions
What is the temperature in September in Van Norman?
What is the average humidity in September in Van Norman?
How much does it rain in Van Norman in September?
When does it start to snow in Van Norman?
How many hours of daylight does Van Norman have in September?
When are sunrise and sunset in September in Van Norman?
How many hours of sunshine does Van Norman have in September?
What is the UV index intensity in September in Van Norman?
Average temperature in September
Van Norman, MT
- Average high temperature in September: 71.2°F
The warmest month (with the highest average high temperature) is July (83.8°F).
The month with the lowest average high temperature is January (27.7°F).
- Average low temperature in September: 54.9°F
The month with the highest average low temperature is July (64.4°F).
The coldest month (with the lowest average low temperature) is January (14.7°F).
Average pressure in September
Van Norman, MT
- Average pressure in September: 29.92"Hg
The months with the highest atmospheric pressure are January and February (30.14"Hg).
The month with the lowest atmospheric pressure is June (29.83"Hg).
Average wind speed in September
Van Norman, MT
- Average wind speed in September: 10.5mph
The windiest month (with the highest average wind speed) is April (12mph).
The calmest month (with the lowest average wind speed) is February (9.9mph).
Average humidity in September
Van Norman, MT
- Average humidity in September: 44%
The month with the highest relative humidity is January (82%).
The month with the lowest relative humidity is August (40%).
Average rainfall in September
Van Norman, MT
- Average rainfall in September: 1.1"
The wettest months (with the highest rainfall) are May and June (1.89").
The driest month (with the least rainfall) is November (0.63").
Average rainfall days in September
Van Norman, MT
- Average rainfall days in September: 8.7 days
The month with the highest number of rainy days is May (14.5 days).
The month with the least rainy days is February (3.7 days).
Average snowfall in September
Van Norman, MT
- Average snowfall in September: 0.04"
The month with the highest snowfall is December (4.45").
The months with the least snowfall are June, July and August (0").
Average snowfall days in September
Van Norman, MT
- Average snowfall days in September: 0.1 days
The month with the highest number of snowfall days is December (12.5 days).
The months with the least snowfall days are July and August (0 days).
Average daylight in September /
Average sunshine in September
Van Norman, MT
- Average daylight in September: 12h and 3min
The month with the longest days is June (Average daylight: 15h and 54min).
The month with the shortest days is December (Average daylight: 8h and 30min).
- Average sunshine in September: 10h and 1min
The month with the most sunshine is July (Average sunshine: 11h and 54min).
The months with the least sunshine are January and February (Average sunshine: 4h and 54min).
Average sunshine days in September
Van Norman, MT
- Average sunshine days in September: 18.7 days
The month with the most sunshine days is November (19.1 days).
The month with the least sunshine days is April (12.3 days).
Average UV index in September
Van Norman, MT
- Average UV index in September: 4
The month with the highest UV index is July (UV index 7).
The month with the lowest UV index is December (UV index 1).
Average cloud cover in September
Van Norman, MT
- Average cloud cover in September: 23
The month with the most cloud cover is February (Cloud cover 49).
The months with the least cloud cover are July and August (Cloud cover 16).
Average visibility in September
Van Norman, MT
- Average visibility in September: 6mi
The months with the highest visibility are February, March, April, May, June, July, August, September, October, November and December (6mi).
The month with the lowest visibility is January (5mi).
Van Norman, Montana, USA
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