Contents
- Weather in October
- Frequently asked questions
- Average temperature in October
- Average pressure in October
- Average wind speed in October
- Average humidity in October
- Average rainfall in October
- Average rainfall days in October
- Average snowfall in October
- Average snowfall days in October
- Average daylight in October
- Average sunshine in October
- Average sunshine days in October
- Average UV index in October
- Average cloud cover in October
- Average visibility in October
Weather in October
Temperature
In O'Fallon, the beginning of October is marked by a lowered average high-temperature, shifting from September's moderately hot 79°F (26.1°C) to a comfortable 66.6°F (19.2°C). Throughout October nights, O'Fallon registers an average low-temperature of 48.7°F (9.3°C).Humidity
The least humid month is October, with an average relative humidity of 70%.Rainfall
In O'Fallon, during October, the rain falls for 8.3 days and regularly aggregates up to 0.75" (19mm) of precipitation. Throughout the year, in O'Fallon, there are 108.8 rainfall days, and 10.24" (260mm) of precipitation is accumulated.Snowfall
In O'Fallon, snow does not fall in April through October.Daylight
In October, the average length of the day is 11h and 11min.On the first day of the month, sunrise is at 6:56 am and sunset at 6:41 pm. On the last day of October, sunrise is at 7:26 am and sunset at 6:00 pm CDT.
Sunshine
In O'Fallon, the average sunshine in October is 6.3h.UV index
The average daily maximum UV index in October is 3. A UV Index value of 3 to 5 symbolizes a moderate health risk from exposure to the Sun's UV radiation for the average person.Note: The average daily UV index of 3 in October transforms into the following instructions:
Be mindful. Individuals with a lighter skin tone may suffer burns in less than 30 minutes. Exposing oneself to the midday Sun can be harmful due to the strong UV radiation; limit your time outside. On days when the sun blazes, arm yourself with sunglasses that block UVA and UVB radiation.
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Data Sources | Weather Forecasting & Climate
Frequently asked questions
What is the average October temperature?
What is the least humid month?
What is the average humidity in October?
How many days does it rain in October?
When it does not snow?
Does it snow in October?
How many hours of daylight does O'Fallon have in October?
What time are sunrise and sunset in October?
How many hours of sunshine does O'Fallon have in October?
How high is the UV index in October?
Average temperature in October
O'Fallon, IL
- Average high temperature in October: 66.6°F
The warmest month (with the highest average high temperature) is July (85.6°F).
The month with the lowest average high temperature is January (37.8°F).
- Average low temperature in October: 48.7°F
The month with the highest average low temperature is July (68.2°F).
The coldest month (with the lowest average low temperature) is January (24.6°F).
Average pressure in October
O'Fallon, IL
- Average pressure in October: 30.04"Hg
The month with the highest atmospheric pressure is January (30.16"Hg).
The month with the lowest atmospheric pressure is June (29.93"Hg).
Average wind speed in October
O'Fallon, IL
- Average wind speed in October: 8.2mph
The windiest month (with the highest average wind speed) is January (9.5mph).
The calmest month (with the lowest average wind speed) is July (5.6mph).
Average humidity in October
O'Fallon, IL
- Average humidity in October: 70%
The months with the highest relative humidity are May, July and August (79%).
The month with the lowest relative humidity is October (70%).
Average rainfall in October
O'Fallon, IL
- Average rainfall in October: 0.75"
The wettest month (with the highest rainfall) is July (1.42").
The driest month (with the least rainfall) is December (0.31").
Average rainfall days in October
O'Fallon, IL
- Average rainfall days in October: 8.3 days
The month with the highest number of rainy days is July (13.1 days).
The month with the least rainy days is December (4.6 days).
Average snowfall in October
O'Fallon, IL
- Average snowfall in October: 0"
The month with the highest snowfall is January (0.51").
The months with the least snowfall are April, May, June, July, August, September and October (0").
Average snowfall days in October
O'Fallon, IL
- Average snowfall days in October: 0 days
The month with the highest number of snowfall days is January (4.7 days).
The months with the least snowfall days are May, June, July, August, September and October (0 days).
Average daylight in October /
Average sunshine in October
O'Fallon, IL
- Average daylight in October: 11h and 1min
The month with the longest days is June (Average daylight: 14h and 48min).
The month with the shortest days is December (Average daylight: 9h and 30min).
- Average sunshine in October: 6h and 2min
The months with the most sunshine are June and July (Average sunshine: 10h and 24min).
The month with the least sunshine is January (Average sunshine: 4h and 30min).
Average sunshine days in October
O'Fallon, IL
- Average sunshine days in October: 22.2 days
The month with the most sunshine days is December (23.6 days).
The months with the least sunshine days are May and July (15.5 days).
Average UV index in October
O'Fallon, IL
- Average UV index in October: 3
The months with the highest UV index are May, June, July and August (UV index 6).
The months with the lowest UV index are January, February, November and December (UV index 2).
Average cloud cover in October
O'Fallon, IL
- Average cloud cover in October: 33
The month with the most cloud cover is January (Cloud cover 51).
The month with the least cloud cover is August (Cloud cover 28).
Average visibility in October
O'Fallon, IL
- Average visibility in October: 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).
O'Fallon, Illinois, USA
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