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
Observing a mild shift, the average high-temperature during September reduces from August's moderately hot 81°F (27.2°C) to an agreeable 71.4°F (21.9°C). Frannie observes an average nighttime low-temperature of 51.3°F (10.7°C) during the month of September.Humidity
In Frannie, Wyoming, the average relative humidity in September is 42%.Rainfall
In Frannie, in September, during 9.5 rainfall days, 0.98" (25mm) of precipitation is typically accumulated. Throughout the year, there are 133.8 rainfall days, and 9.8" (249mm) of precipitation is accumulated.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, there are 64 snowfall days, and 19.92" (506mm) of snow is accumulated.Daylight
In September, the average length of the day is 12h and 31min.On the first day of September, sunrise is at 6:37 am and sunset at 7:50 pm. On the last day of the month, sunrise is at 7:12 am and sunset at 6:56 pm MDT.
Sunshine
In September, the average sunshine is 10.8h.UV index
In Frannie, 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 the average person.Note: The maximum daily UV index of 4 in September converts into the following recommendations:
Prioritize safety - Recommendations to avert sunburn are shared. Limiting exposure to the direct Sun during midday hours can help prevent harmful UV radiation effects. Wearing a wide-brim hat can block approximately 50% of UV radiation, protecting the eyes. Be alert to the fact! The reflection from snow can nearly double the UV radiation of the Sun.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What are the temperatures in September?
What is the average humidity in September?
How many days does it rain in September?
When does it start to snow?
What is the average length of the day in September?
When is the sunrise / sunset in September?
How long on average sun shines in September?
How high is the UV index in September?
Average temperature in September
Frannie, WY
- Average high temperature in September: 71.4°F
The warmest month (with the highest average high temperature) is July (83.5°F).
The month with the lowest average high temperature is December (27.5°F).
- Average low temperature in September: 51.3°F
The month with the highest average low temperature is July (61°F).
The coldest months (with the lowest average low temperature) are January and February (14.4°F).
Average pressure in September
Frannie, WY
- Average pressure in September: 29.96"Hg
The months with the highest atmospheric pressure are January and December (30.15"Hg).
The month with the lowest atmospheric pressure is June (29.88"Hg).
Average wind speed in September
Frannie, WY
- Average wind speed in September: 6.8mph
The windiest month (with the highest average wind speed) is April (8.7mph).
The calmest month (with the lowest average wind speed) is August (5.8mph).
Average humidity in September
Frannie, WY
- Average humidity in September: 42%
The month with the highest relative humidity is January (80%).
The month with the lowest relative humidity is August (37%).
Average rainfall in September
Frannie, WY
- Average rainfall in September: 0.98"
The wettest month (with the highest rainfall) is May (1.57").
The driest month (with the least rainfall) is December (0.51").
Average rainfall days in September
Frannie, WY
- Average rainfall days in September: 9.5 days
The month with the highest number of rainy days is May (16.9 days).
The month with the least rainy days is November (8.3 days).
Average snowfall in September
Frannie, WY
- Average snowfall in September: 0.04"
The month with the highest snowfall is February (4.88").
The months with the least snowfall are June, July and August (0").
Average snowfall days in September
Frannie, WY
- Average snowfall days in September: 0.1 days
The month with the highest number of snowfall days is January (14.1 days).
The months with the least snowfall days are June, July and August (0 days).
Average daylight in September /
Average sunshine in September
Frannie, WY
- Average daylight in September: 12h and 3min
The month with the longest days is June (Average daylight: 15h and 36min).
The month with the shortest days is December (Average daylight: 8h and 48min).
- Average sunshine in September: 10h and 5min
The month with the most sunshine is July (Average sunshine: 12h and 0min).
The months with the least sunshine are January, February and December (Average sunshine: 6h and 24min).
Average sunshine days in September
Frannie, WY
- Average sunshine days in September: 16.2 days
The month with the most sunshine days is December (17.2 days).
The month with the least sunshine days is May (10.2 days).
Average UV index in September
Frannie, WY
- Average UV index in September: 4
The months with the highest UV index are June and July (UV index 6).
The months with the lowest UV index are January, February, March, November and December (UV index 2).
Average cloud cover in September
Frannie, WY
- Average cloud cover in September: 16
The month with the most cloud cover is February (Cloud cover 35).
The month with the least cloud cover is July (Cloud cover 12).
Average visibility in September
Frannie, 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).
Frannie, Wyoming, USA
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