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
The commencement of September includes a gentle temperature shift, with the average high-temperature dropping a bit from a moderately hot 81.9°F (27.7°C) in August to an agreeable 73°F (22.8°C). Nighttime temperature experiences an average drop to a cool 52°F (11.1°C) in September.Humidity
The average relative humidity in September is 38%.Rainfall
In September, the rain falls for 9.4 days. Throughout September, 0.91" (23mm) of precipitation is accumulated. Throughout the year, there are 117.2 rainfall days, and 11.14" (283mm) of precipitation is accumulated.Snowfall
January through May, September through December are months with snowfall in Hamilton Dome, Wyoming. September is the first month it typically snows. Throughout September, in the average 0.2 snowfall days, it receives 0.47" (12mm) of snow. In Hamilton Dome, during the entire year, snow falls for 51.2 days and aggregates up to 21.3" (541mm) of snow.Daylight
In Hamilton Dome, the average length of the day in September is 12h and 29min.On the first day of the month, sunrise is at 6:38 am and sunset at 7:49 pm. On the last day of September, sunrise is at 7:11 am and sunset at 6:56 pm MDT.
Sunshine
The average sunshine in September is 10.7h.UV index
The average daily maximum UV index in September is 4. A UV Index of 3 to 5 symbolizes a moderate threat to health from exposure to the Sun's UV rays for ordinary individuals.Note: The maximum UV index of 4 during September leads to these instructions:
Take measures. Individuals with light skin might experience burns in under 30 minutes. Avoiding the Sun's peak radiation during midday hours is essential for health and safety. Boost your sun resistance with garments that are densely woven yet spacious. Heed this! Snow reflection can almost augment the UV radiation of the sun by double.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What is the usual temperature for Hamilton Dome in September?
What is the average humidity in September?
How many days does it rain in September?
When does it start to snow in Hamilton Dome?
What is the average length of the day in September?
When are sunrise and sunset in September in Hamilton Dome?
How long on average sun shines in September in Hamilton Dome?
How high is the UV index in September?
Average temperature in September
Hamilton Dome, WY
- Average high temperature in September: 73°F
The warmest month (with the highest average high temperature) is July (84.9°F).
The month with the lowest average high temperature is December (28.2°F).
- Average low temperature in September: 52°F
The month with the highest average low temperature is July (61.3°F).
The coldest month (with the lowest average low temperature) is January (12.6°F).
Average pressure in September
Hamilton Dome, WY
- Average pressure in September: 29.97"Hg
The month with the highest atmospheric pressure is January (30.19"Hg).
The month with the lowest atmospheric pressure is June (29.88"Hg).
Average wind speed in September
Hamilton Dome, WY
- Average wind speed in September: 5.7mph
The windiest month (with the highest average wind speed) is April (7.1mph).
The calmest month (with the lowest average wind speed) is January (5mph).
Average humidity in September
Hamilton Dome, WY
- Average humidity in September: 38%
The month with the highest relative humidity is January (81%).
The months with the lowest relative humidity are July and August (35%).
Average rainfall in September
Hamilton Dome, WY
- Average rainfall in September: 0.91"
The wettest month (with the highest rainfall) is May (1.93").
The driest month (with the least rainfall) is January (0.43").
Average rainfall days in September
Hamilton Dome, WY
- Average rainfall days in September: 9.4 days
The month with the highest number of rainy days is May (17 days).
The months with the least rainy days are January and December (4.3 days).
Average snowfall in September
Hamilton Dome, WY
- Average snowfall in September: 0.47"
The month with the highest snowfall is February (4.57").
The months with the least snowfall are June, July and August (0").
Average snowfall days in September
Hamilton Dome, WY
- Average snowfall days in September: 0.2 days
The month with the highest number of snowfall days is February (11.1 days).
The months with the least snowfall days are June, July and August (0 days).
Average daylight in September /
Average sunshine in September
Hamilton Dome, WY
- Average daylight in September: 12h and 3min
The month with the longest days is June (Average daylight: 15h and 24min).
The month with the shortest days is December (Average daylight: 9h and 0min).
- Average sunshine in September: 10h and 4min
The month with the most sunshine is July (Average sunshine: 11h and 54min).
The month with the least sunshine is February (Average sunshine: 6h and 12min).
Average sunshine days in September
Hamilton Dome, WY
- Average sunshine days in September: 17.3 days
The month with the most sunshine days is January (20.2 days).
The month with the least sunshine days is May (10.1 days).
Average UV index in September
Hamilton Dome, 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, November and December (UV index 2).
Average cloud cover in September
Hamilton Dome, WY
- Average cloud cover in September: 15
The month with the most cloud cover is February (Cloud cover 35).
The months with the least cloud cover are July and August (Cloud cover 14).
Average visibility in September
Hamilton Dome, WY
- 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).
Hamilton Dome, Wyoming, USA
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