Sullivan County, IN Weather


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The most pleasant months of the year for Sullivan County are September, May and June. In Sullivan County, there are 3 comfortable months with high temperatures in the range of 70-85°. July is the hottest month for Sullivan County with an average high temperature of 86.3°, which ranks it as warmer than most places in Indiana. January is the snowiest month in Sullivan County with 4.1 inches of snow, and 4 months of the year have significant snowfall. July is the most humid month, though humidity is low for most of the year.

Today's Weather - Sullivan, IN

12 AM PST

Mostly Cloudy

62°F

7 DAY FORECASTDESCRIPTIONHIGH/LOWWIND
OvernightMostly Cloudy62° / 80°SE 6 mph
Tuesday NightScattered Showers And Thunderstorms then Partly Cloudy60° / 83°SW 6 to 20 mph
Wednesday NightChance Showers And Thunderstorms then Showers And Thunderstorms62° / 74°SSW 13 mph
Thursday NightSlight Chance Showers And Thunderstorms then Partly Cloudy48° / 66°NW 13 to 18 mph
Friday NightSlight Chance Rain Showers then Slight Chance Showers And Thunderstorms49° / 69°W 7 to 13 mph
Saturday NightChance Showers And Thunderstorms then Partly Cloudy48° / 72°WNW 9 to 17 mph
Sunday NightSlight Chance Rain Showers then Mostly Clear51° / 77°SW 9 to 13 mph

Weather Highlights

Summer High: the July high is around 86 degrees
Winter Low: the January low is 21
Rain: averages 44 inches of rain a year
Snow: averages 12 inches of snow a year


BESTPLACES COMFORT INDEX

The annual BestPlaces Comfort Index for the Sullivan County area is 8.1 (10=best), which means it is more comfortable than most places in Indiana.

8.1 / 10

A higher score indicates a more comfortable year-round climate. The US average for the comfort index is 7.8. Our index is based on the total number of days annually within the comfort range of 70-80 degrees, and we also applied a penalty for days of excessive humidity.


Average Monthly High and Low (°F)
HighLow
January37° 21°
February42° 24°
March53° 33°
April65° 43°
May75° 53°
June83° 63°
July86° 66°
August85° 64°
September79° 55°
October67° 44°
November54° 35°
December41° 25°
Hot, Freezing, Rainy, Snowy Days: Sullivan
Hot
Days
Freezing
Days
Rainy
Days
Snowy
Days
January026103
February02292
March016101
April04110
May10120
June40100
July8090
August7080
September2070
October0380
November013100
December023102

YOU SHOULD KNOW

Many people confuse weather and climate but they are different. Weather is the conditions of the atmosphere over a short period of time, and climate is how the atmosphere is over long periods of time.

Weather is how the atmosphere is behaving and its effects upon life and human activities. Weather can change from minute-to-minute. Most people think of weather in terms of temperature, humidity, precipitation, cloudiness, brightness, visibility, wind, and atmospheric pressure.

Climate is the description of the long-term pattern of weather in a place. Climate can mean the average weather for a particular region and time period taken over 30 years. Climate is the average of weather over time.

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