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Contents
- Weather in January
- Weather in February
- Weather in March
- Weather in April
- Weather in May
- Weather in June
- Weather in July
- Weather in August
- Weather in September
- Weather in October
- Weather in November
- Weather in December
- Frequently asked questions
- Average temperature
- Average pressure
- Average wind speed
- Average humidity
- Average rainfall
- Average rainfall days
- Average snowfall
- Average snowfall days
- Average daylight
- Average sunshine
- Average sunshine days
- Average UV index
- Average cloud cover
- Average visibility
Weather in January
January, like December, in Sullivan, Indiana, is an icy winter month, with temperature in the range of an average low of 23.2°F (-4.9°C) and an average high of 36°F (2.2°C). January is the coldest month, with an average high-temperature of 36°F (2.2°C) and an average low-temperature of 23.2°F (-4.9°C). Weather in January »
Weather in February
February, the last month of the winter in Sullivan, is also a wintry month, with an average temperature fluctuating between 40.6°F (4.8°C) and 27°F (-2.8°C). Transitioning into February, Sullivan records an average high-temperature of a still cold 40.6°F (4.8°C), almost identical to January's 36°F (2.2°C). Weather in February »
Weather in March
The first month of the spring, March, is a cool month in Sullivan, Indiana, with an average temperature fluctuating between 52.3°F (11.3°C) and 36.7°F (2.6°C). The shift from February to March is marked by an increase in the average high-temperature, moving from a cold 40.6°F (4.8°C) to a fresh 52.3°F (11.3°C). Weather in March »
Weather in April
April is a comfortable spring month in Sullivan, Indiana, with an average temperature fluctuating between 63.7°F (17.6°C) and 46.9°F (8.3°C). With the onset of April, Sullivan sees a temperature rise, with the average high-temperature moving from March's fresh 52.3°F (11.3°C) to an enjoyable 63.7°F (17.6°C). Weather in April »
Weather in May
The last month of the spring, May, is an agreeable month in Sullivan, Indiana, with an average temperature varying between 73°F (22.8°C) and 56.7°F (13.7°C). Sullivan sees an increase in average high-temperatures during May, moving from a refreshing 63.7°F (17.6°C) in April to a pleasant 73°F (22.8°C). Weather in May »
Weather in June
June, the first month of the summer in Sullivan, is a warm month, with an average temperature fluctuating between 64.9°F (18.3°C) and 81.9°F (27.7°C). Sullivan observes a slight ascent in average high-temperatures during June, adjusting from an agreeable 73°F (22.8°C) in May to a moderately hot 81.9°F (27.7°C). Weather in June »
Weather in July
July, the same as June, is a moderately hot summer month in Sullivan, Indiana, with temperature in the range of an average low of 66.7°F (19.3°C) and an average high of 83.7°F (28.7°C). In Sullivan, the peak temperatures are generally noted in July, averaging a high of 83.7°F (28.7°C) and a low of 66.7°F (19.3°C). For July, the heat index is calculated to be a tropical 93.2°F (34°C). Weather in July »
Weather in August
The last month of the summer, August, is another warm month in Sullivan, Indiana, with temperature in the range of an average low of 64.8°F (18.2°C) and an average high of 82.6°F (28.1°C). With the advent of August, Sullivan experiences an average high-temperature of a still warm 82.6°F (28.1°C), mirroring a close resemblance to the previous month. Weather in August »
Weather in September
September, the first month of the autumn in Sullivan, is still a warm month, with temperature in the range of an average high of 77.7°F (25.4°C) and an average low of 59.5°F (15.3°C). Welcoming September, Sullivan notes an average high-temperature of a still warm 77.7°F (25.4°C), nearly consistent with August's 82.6°F (28.1°C). Weather in September »
Weather in October
October, like September, in Sullivan, Indiana, is another comfortable autumn month, with an average temperature varying between 65.1°F (18.4°C) and 48.4°F (9.1°C). The shift from September to October involves a decrease in the average high-temperature, from a moderately hot 77.7°F (25.4°C) to a refreshing 65.1°F (18.4°C). Weather in October »
Weather in November
November, the last month of the autumn in Sullivan, is another cool month, with temperature in the range of an average low of 37.2°F (2.9°C) and an average high of 51.3°F (10.7°C). November's onset brings a slight change in high-temperatures, falling from a comfortable 65.1°F (18.4°C) in October to a fresh 51.3°F (10.7°C). Weather in November »
Weather in December
December, the first month of the winter in Sullivan, is still a cold month, with an average temperature varying between 40.8°F (4.9°C) and 29.5°F (-1.4°C). A moderate decline in the average high-temperature is seen during December, decreasing from a fresh 51.3°F (10.7°C) in November to a cold 40.8°F (4.9°C). Weather in December »
Updated: Jul 30, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What time of the year is the coldest?
In Sullivan, January records the average lowest temperatures, peaking at 36°F (2.2°C) and reaching a low of 23.2°F (-4.9°C).
How much does it rain?
Throughout the year, there are 150.1 rainfall days, and 28.5" (724mm) of precipitation is accumulated.
When does it snow?
January through April, November and December are months with snowfall.
What is the snowiest month?
January is the month with the most snowfall. Snow falls for 7.3 days and accumulates 2.13" (54mm) of snow.
How much does it snow?
Throughout the year, there are 23.8 snowfall days, and 6.89" (175mm) of snow is accumulated.
What is the month with the lowest UV index?
January, February, November and December, with an average maximum UV index of 2, are months with the lowest UV index.
When is Daylight Saving Time (DST) in Sullivan?
On Sunday, March 10. 2024, at 2:00 am, Daylight Saving Time starts, and the time zone changes from EST to EDT. Daylight Saving Time ends Sunday, November 3. 2024, at 2:00 am, and the time zone reverts from EDT to EST.
What is the wettest month?
April is the month with the most rainfall. Rain falls for 16 days and accumulates 4.06" (103mm) of precipitation.
When it does not snow?
In Sullivan, Indiana, snow does not fall in May through October.
What are the months with the highest UV index?
May through August, with an average maximum UV index of 6, are months with the highest UV index.
When are the longest days?
June has the longest days of the year, with an average of 14h and 54min of daylight.
What month has the most sunshine?
With an average of 10.4h of sunshine, June has the most sunshine of the year in Sullivan.
What part of the year is the hottest in Sullivan?
The temperatures reach their highest averages in July, with highs of 83.7°F (28.7°C) and lows of 66.7°F (19.3°C).
What is the most humid month?
The most humid month is July, with an average relative humidity of 82%.
What is the driest month?
September is the month with the least rainfall. Rain falls for 11.8 days and accumulates 1.54" (39mm) of precipitation.
What is the least humid month in Sullivan?
The least humid month is October, with an average relative humidity of 71%.
What is the month with the shortest days?
With an average of 9h and 30min of daylight, December has the shortest days of the year.
What is the month with the least sunshine?
With an average of 4.4h of sunshine, December has the least sunshine of the year.
Average temperature
Sullivan, IN
The warmest month (with the highest average high temperature) is July (83.7°F).
The month with the lowest average high temperature is January (36°F).
The month with the highest average low temperature is July (66.7°F).
The coldest month (with the lowest average low temperature) is January (23.2°F).
Average pressure
Sullivan, IN
- Average pressure in January:
30.15"Hg - Average pressure in February:
30.11"Hg - Average pressure in March:
30.08"Hg - Average pressure in April:
29.95"Hg - Average pressure in May:
29.97"Hg - Average pressure in June:
29.93"Hg
- Average pressure in July:
29.98"Hg - Average pressure in August:
29.99"Hg - Average pressure in September:
30.03"Hg - Average pressure in October:
30.03"Hg - Average pressure in November:
30.14"Hg - Average pressure in December:
30.13"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
Sullivan, IN
- Average wind speed in January:
9.8mph - Average wind speed in February:
9.8mph - Average wind speed in March:
9.6mph - Average wind speed in April:
9.6mph - Average wind speed in May:
8mph - Average wind speed in June:
6.9mph
- Average wind speed in July:
5.8mph - Average wind speed in August:
5.8mph - Average wind speed in September:
6.6mph - Average wind speed in October:
8.4mph - Average wind speed in November:
8.9mph - Average wind speed in December:
8.9mph
The windiest months (with the highest average wind speed) are January and February (9.8mph).
The calmest months (with the lowest average wind speed) are July and August (5.8mph).
Average humidity
Sullivan, IN
The month with the highest relative humidity is July (82%).
The month with the lowest relative humidity is October (71%).
Average rainfall
Sullivan, IN
- Average rainfall in January:
2.01" - Average rainfall in February:
1.61" - Average rainfall in March:
2.13" - Average rainfall in April:
4.06" - Average rainfall in May:
3.07" - Average rainfall in June:
3.19"
- Average rainfall in July:
2.68" - Average rainfall in August:
2.2" - Average rainfall in September:
1.54" - Average rainfall in October:
1.89" - Average rainfall in November:
1.89" - Average rainfall in December:
2.24"
The wettest month (with the highest rainfall) is April (4.06").
The driest month (with the least rainfall) is September (1.54").
Average rainfall days
Sullivan, IN
- Average rainfall days in January:
8.5 days - Average rainfall days in February:
8.6 days - Average rainfall days in March:
13.1 days - Average rainfall days in April:
16 days - Average rainfall days in May:
18 days - Average rainfall days in June:
14.8 days
- Average rainfall days in July:
16.5 days - Average rainfall days in August:
13.6 days - Average rainfall days in September:
11.8 days - Average rainfall days in October:
10.7 days - Average rainfall days in November:
9.1 days - Average rainfall days in December:
9.4 days
The month with the highest number of rainy days is May (18 days).
The month with the least rainy days is January (8.5 days).
Average snowfall
Sullivan, IN
The month with the highest snowfall is January (2.13").
The months with the least snowfall are May, June, July, August, September and October (0").
Average snowfall days
Sullivan, IN
- Average snowfall days in January:
7.3 days - Average snowfall days in February:
5.5 days - Average snowfall days in March:
3.3 days - Average snowfall days in April:
0.4 days - Average snowfall days in May:
0 days - Average snowfall days in June:
0 days
- Average snowfall days in July:
0 days - Average snowfall days in August:
0 days - Average snowfall days in September:
0 days - Average snowfall days in October:
0 days - Average snowfall days in November:
2.1 days - Average snowfall days in December:
5.2 days
The month with the highest number of snowfall days is January (7.3 days).
The months with the least snowfall days are May, June, July, August, September and October (0 days).
Average daylight / Average sunshine
Sullivan, IN
- Average daylight in January:
9h and 5min - Average daylight in February:
10h and 5min - Average daylight in March:
12h and 0min - Average daylight in April:
13h and 2min - Average daylight in May:
14h and 2min - Average daylight in June:
14h and 5min
- Average daylight in July:
14h and 4min - Average daylight in August:
13h and 4min - Average daylight in September:
12h and 2min - Average daylight in October:
11h and 1min - Average daylight in November:
10h and 0min - Average daylight in December:
9h and 3min
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 30min).
- Average sunshine in January:
4h and 3min - Average sunshine in February:
5h and 4min - Average sunshine in March:
6h and 2min - Average sunshine in April:
7h and 1min - Average sunshine in May:
8h and 5min - Average sunshine in June:
10h and 2min
- Average sunshine in July:
10h and 1min - Average sunshine in August:
9h and 1min - Average sunshine in September:
8h and 4min - Average sunshine in October:
7h and 1min - Average sunshine in November:
5h and 2min - Average sunshine in December:
4h and 2min
The month with the most sunshine is June (Average sunshine: 10h and 24min).
The month with the least sunshine is December (Average sunshine: 4h and 24min).
Average sunshine days
Sullivan, IN
- Average sunshine days in January:
16.9 days - Average sunshine days in February:
13.9 days - Average sunshine days in March:
14.4 days - Average sunshine days in April:
12.3 days - Average sunshine days in May:
10.1 days - Average sunshine days in June:
12.8 days
- Average sunshine days in July:
11.6 days - Average sunshine days in August:
14.7 days - Average sunshine days in September:
15.9 days - Average sunshine days in October:
18.6 days - Average sunshine days in November:
18.7 days - Average sunshine days in December:
16.9 days
The month with the most sunshine days is November (18.7 days).
The month with the least sunshine days is May (10.1 days).
Average UV index
Sullivan, IN
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
Sullivan, IN
The month with the most cloud cover is January (Cloud cover 55).
The month with the least cloud cover is August (Cloud cover 29).
Average visibility
Sullivan, IN
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).
Sullivan, Indiana, USA
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