October weather forecastSullivan, IL
October
Weather in October
October, like September, in Sullivan, Illinois, is another refreshing autumn month, with an average temperature varying between 63.9°F (17.7°C) and 48.2°F (9°C).Temperature
As September shifts into October, a slight alteration in temperatures is observed, with average highs reducing from a moderately hot 77.2°F (25.1°C) to an enjoyable 63.9°F (17.7°C). In October, Sullivan experiences an average nighttime temperature of 48.2°F (9°C).Humidity
October is the least humid month, with an average relative humidity of 70%.Rainfall
In October, in Sullivan, the rain falls for 9.2 days. Throughout October, 1.3" (33mm) of precipitation is accumulated. Throughout the year, in Sullivan, Illinois, there are 130.9 rainfall days, and 15.43" (392mm) of precipitation is accumulated.Snowfall
May through October are months without snowfall in Sullivan, Illinois.Daylight
In October, the average length of the day is 11h and 8min.On the first day of the month, sunrise is at 6:51 am and sunset at 6:36 pm. On the last day of October, in Sullivan, sunrise is at 7:22 am and sunset at 5:53 pm CDT.
Sunshine
In October, the average sunshine is 6.3h.UV index
In October, the average daily maximum UV index in Sullivan, Illinois, is 3. A UV Index reading of 3 to 5 represents a medium health hazard from unprotected exposure to Sun's UV rays for the average person.Note: The maximum UV index of 3 during October leads to these instructions:
Take necessary precautions - Protection from skin and eye injury is mandatory. During midday, the Sun's radiation is strongest, and it's advisable to reduce direct exposure. To best shield against UV radiation, choose sun-safe garments and dependable sunglasses.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in October
Sullivan, IL
- Average high temperature in October: 63.9°F
The warmest month (with the highest average high temperature) is July (82.2°F).
The month with the lowest average high temperature is January (33.6°F).
- Average low temperature in October: 48.2°F
The month with the highest average low temperature is July (65.8°F).
The coldest month (with the lowest average low temperature) is January (21.6°F).
Average pressure in October
Sullivan, IL
- Average pressure in October: 30.03"Hg
The month with the highest atmospheric pressure is January (30.15"Hg).
The month with the lowest atmospheric pressure is June (29.93"Hg).
Average wind speed in October
Sullivan, IL
- Average wind speed in October: 9.3mph
The windiest month (with the highest average wind speed) is January (10.7mph).
The calmest months (with the lowest average wind speed) are July and August (6.3mph).
Average humidity in October
Sullivan, IL
- Average humidity in October: 70%
The month with the highest relative humidity is July (84%).
The month with the lowest relative humidity is October (70%).
Average rainfall in October
Sullivan, IL
- Average rainfall in October: 1.3"
The wettest month (with the highest rainfall) is June (1.85").
The driest month (with the least rainfall) is February (0.71").
Average rainfall days in October
Sullivan, IL
- Average rainfall days in October: 9.2 days
The month with the highest number of rainy days is May (16.3 days).
The month with the least rainy days is February (5.9 days).
Average snowfall in October
Sullivan, IL
- Average snowfall in October: 0"
The month with the highest snowfall is January (1.54").
The months with the least snowfall are May, June, July, August, September and October (0").
Average snowfall days in October
Sullivan, IL
- Average snowfall days in October: 0 days
The month with the highest number of snowfall days is January (6.4 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
Sullivan, IL
- Average daylight in October: 11h and 6min
The month with the longest days is June (Average daylight: 14h and 54min).
The month with the shortest days is December (Average daylight: 9h and 24min).
- Average sunshine in October: 6h and 18min
The month with the most sunshine is June (Average sunshine: 10h and 24min).
The month with the least sunshine is January (Average sunshine: 4h and 6min).
Average sunshine days in October
Sullivan, IL
- Average sunshine days in October: 20.5 days
The month with the most sunshine days is October (20.5 days).
The month with the least sunshine days is May (12.3 days).
Average UV index in October
Sullivan, IL
- Average UV index in October: 3
The months with the highest UV index are 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
Sullivan, IL
- Average cloud cover in October: 35
The month with the most cloud cover is January (Cloud cover 56).
The month with the least cloud cover is June (Cloud cover 30).
Average visibility in October
Sullivan, IL
- Average visibility in October: 6mi
The months with the highest visibility are January, February, March, April, May, June, September, October, November and December (6mi).
The months with the lowest visibility are July and August (5mi).
