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
September's arrival signals a moderate reduction in the average high-temperature, easing from a warm 79.7°F (26.5°C) in August to a pleasant 70.9°F (21.6°C). In Hanna, in September, the average low-temperature is a cool 50.2°F (10.1°C).Humidity
In Hanna, the average relative humidity in September is 38%.Rainfall
In Hanna, Wyoming, during September, the rain falls for 6.2 days and regularly aggregates up to 0.39" (10mm) of precipitation. In Hanna, Wyoming, during the entire year, the rain falls for 80.5 days and collects up to 8.39" (213mm) of precipitation.Snowfall
January through May, September through December are months with snowfall. September is the first month it typically snows in Hanna. Throughout September, in the average 0.1 snowfall days, it receives 0.04" (1mm) of snow. In Hanna, during the entire year, snow falls for 70.3 days and aggregates up to 29.57" (751mm) of snow.Daylight
In Hanna, Wyoming, the average length of the day in September is 12h and 28min.On the first day of September, sunrise is at 6:32 am and sunset at 7:39 pm. On the last day of the month, sunrise is at 7:02 am and sunset at 6:48 pm MDT.
Sunshine
In September, the average sunshine is 11.1h.UV index
In September, the average daily maximum UV index in Hanna, Wyoming, is 4. A UV Index of 3 to 5 symbolizes a medium vulnerability from exposure to the Sun's UV radiation for the average person.Note: The UV index of 4 during September leads to these advisories:
Take measures. Individuals with light skin might experience burns in under 30 minutes. Midday Sun has the strongest UV rays, making it crucial to limit exposure and find shade. In bright sunlight, prioritize sunglasses that grant protection from UVA and UVB radiation. Mark this! Snow reflection can nearly double the UV radiation intensity from the Sun.
Frequently asked questions
What are September temperatures in Hanna?
What is the average humidity in September in Hanna?
How many days does it rain in September in Hanna?
When does it start snowing in Hanna?
What is the average length of the day in September in Hanna?
What time are sunrise and sunset in September in Hanna?
How many hours of sunshine does Hanna have in September?
What is the UV index reading in September in Hanna?
Average temperature in September
Hanna, WY
- Average high temperature in September: 70.9°F
The warmest month (with the highest average high temperature) is July (81.7°F).
The month with the lowest average high temperature is December (26.4°F).
- Average low temperature in September: 50.2°F
The month with the highest average low temperature is July (58.3°F).
The coldest month (with the lowest average low temperature) is December (13.1°F).
Average pressure in September
Hanna, WY
- Average pressure in September: 29.97"Hg
The month with the highest atmospheric pressure is January (30.21"Hg).
The month with the lowest atmospheric pressure is June (29.87"Hg).
Average wind speed in September
Hanna, WY
- Average wind speed in September: 10.5mph
The windiest month (with the highest average wind speed) is November (12.4mph).
The calmest months (with the lowest average wind speed) are July and August (9.3mph).
Average humidity in September
Hanna, WY
- Average humidity in September: 38%
The month with the highest relative humidity is January (83%).
The month with the lowest relative humidity is August (34%).
Average rainfall in September
Hanna, WY
- Average rainfall in September: 0.39"
The wettest month (with the highest rainfall) is April (1.34").
The driest month (with the least rainfall) is August (0.24").
Average rainfall days in September
Hanna, WY
- Average rainfall days in September: 6.2 days
The month with the highest number of rainy days is May (12.3 days).
The month with the least rainy days is February (4.3 days).
Average snowfall in September
Hanna, WY
- Average snowfall in September: 0.04"
The month with the highest snowfall is March (5.47").
The months with the least snowfall are June, July and August (0").
Average snowfall days in September
Hanna, WY
- Average snowfall days in September: 0.1 days
The month with the highest number of snowfall days is February (12.5 days).
The months with the least snowfall days are June, July and August (0 days).
Average daylight in September /
Average sunshine in September
Hanna, WY
- Average daylight in September: 12h and 3min
The month with the longest days is June (Average daylight: 15h and 12min).
The month with the shortest days is December (Average daylight: 9h and 12min).
- Average sunshine in September: 11h and 1min
The month with the most sunshine is July (Average sunshine: 12h and 0min).
The months with the least sunshine are February and December (Average sunshine: 5h and 54min).
Average sunshine days in September
Hanna, WY
- Average sunshine days in September: 22.4 days
The month with the most sunshine days is August (23.6 days).
The month with the least sunshine days is April (12.6 days).
Average UV index in September
Hanna, WY
- Average UV index in September: 4
The month with the highest UV index is July (UV index 6).
The months with the lowest UV index are January, February, March, April, October, November and December (UV index 2).
Average cloud cover in September
Hanna, WY
- Average cloud cover in September: 14
The month with the most cloud cover is February (Cloud cover 43).
The month with the least cloud cover is August (Cloud cover 13).
Average visibility in September
Hanna, WY
- Average visibility in September: 6mi
The months with the highest visibility are January, February, March, April, May, June, July, August, September, October and November (6mi).
The month with the lowest visibility is December (5mi).
Hanna, Wyoming, USA
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