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
In Dell, the average high-temperature in September decreases from a moderately hot 75.4°F (24.1°C) in August to a refreshing 65.8°F (18.8°C). Dell, after hot September days, encounters a marked drop to an average nighttime temperature of 42.1°F (5.6°C).Humidity
In Dell, the average relative humidity in September is 48%.Rainfall
In Dell, in September, during 7.8 rainfall days, 0.75" (19mm) of precipitation is typically accumulated. Throughout the year, there are 103.2 rainfall days, and 9.84" (250mm) of precipitation is accumulated.Snowfall
January through June, September through December are months with snowfall in Dell. September is the first month it typically snows in Dell. Throughout September, in the average 0.9 snowfall days, it receives 1.22" (31mm) of snow. In Dell, during the entire year, snow falls for 81.9 days and aggregates up to 31.65" (804mm) of snow.Daylight
The average length of the day in September in Dell is 12h and 30min.On the first day of September, sunrise is at 6:54 am and sunset at 8:06 pm. On the last day of the month, sunrise is at 7:28 am and sunset at 7:12 pm MDT.
Sunshine
In Dell, the average sunshine in September is 9.7h.UV index
In Dell, Montana, the average daily maximum UV index in September is 3. A UV Index reading of 3 to 5 represents a moderate threat to health from exposure to the Sun's UV rays for the ordinary person.Note: The average daily UV index of 3 in September transforms into the following instructions:
Make use of precautions - Shielding skin and eyes from injury is a requirement. Avoiding the Sun during its peak radiation time around midday is a healthy practice. On bright days sunglasses that block both UVA and UVB rays should be worn. A hat with a wide brim is extremely helpful, as it can prevent roughly 50% of UV radiation from reaching the eyes. Take to heart! Snow reflection can almost magnify the Sun's UV radiation twofold.
Frequently asked questions
What are September temperatures in Dell?
What is the average humidity in September in Dell?
How many days does it rain in September in Dell?
When does it start snowing in Dell?
How many hours of daylight does Dell have in September?
When is the sunrise / sunset in September in Dell?
How many hours of sunshine does Dell have in September?
How high is the UV index in September in Dell?
Average temperature in September
Dell, MT
- Average high temperature in September: 65.8°F
The warmest month (with the highest average high temperature) is July (76.6°F).
The month with the lowest average high temperature is December (24.3°F).
- Average low temperature in September: 42.1°F
The month with the highest average low temperature is July (47.1°F).
The coldest month (with the lowest average low temperature) is December (9.9°F).
Average pressure in September
Dell, MT
- Average pressure in September: 29.99"Hg
The month with the highest atmospheric pressure is January (30.25"Hg).
The month with the lowest atmospheric pressure is June (29.92"Hg).
Average wind speed in September
Dell, MT
- Average wind speed in September: 5.8mph
The windiest months (with the highest average wind speed) are November and December (7.3mph).
The calmest month (with the lowest average wind speed) is August (5.4mph).
Average humidity in September
Dell, MT
- Average humidity in September: 48%
The months with the highest relative humidity are January and February (86%).
The months with the lowest relative humidity are July and August (43%).
Average rainfall in September
Dell, MT
- Average rainfall in September: 0.75"
The wettest month (with the highest rainfall) is June (1.73").
The driest month (with the least rainfall) is January (0.43").
Average rainfall days in September
Dell, MT
- Average rainfall days in September: 7.8 days
The month with the highest number of rainy days is May (13.7 days).
The month with the least rainy days is January (4.6 days).
Average snowfall in September
Dell, MT
- Average snowfall in September: 1.22"
The month with the highest snowfall is April (4.96").
The months with the least snowfall are July and August (0").
Average snowfall days in September
Dell, MT
- Average snowfall days in September: 0.9 days
The month with the highest number of snowfall days is February (13.3 days).
The months with the least snowfall days are July and August (0 days).
Average daylight in September /
Average sunshine in September
Dell, MT
- Average daylight in September: 12h and 3min
The month with the longest days is June (Average daylight: 15h and 30min).
The month with the shortest days is December (Average daylight: 8h and 54min).
- Average sunshine in September: 9h and 4min
The month with the most sunshine is July (Average sunshine: 11h and 54min).
The month with the least sunshine is January (Average sunshine: 5h and 54min).
Average sunshine days in September
Dell, MT
- Average sunshine days in September: 18.4 days
The month with the most sunshine days is July (20.7 days).
The month with the least sunshine days is April (10.7 days).
Average UV index in September
Dell, MT
- Average UV index in September: 3
The month with the highest UV index is July (UV index 5).
The month with the lowest UV index is February (UV index 1).
Average cloud cover in September
Dell, MT
- Average cloud cover in September: 19
The month with the most cloud cover is February (Cloud cover 45).
The month with the least cloud cover is July (Cloud cover 13).
Average visibility in September
Dell, MT
- Average visibility in September: 6mi
The months with the highest visibility are April, May, June, July, August, September, October and November (6mi).
The month with the lowest visibility is February (4mi).
Dell, Montana, USA
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