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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, the same as December, in Decatur, Indiana, is a freezing cold winter month, with an average temperature ranging between max 31.3°F (-0.4°C) and min 19.8°F (-6.8°C). Decatur witnesses the coldest weather in January, with temperatures averaging a high of 31.3°F (-0.4°C) and a low of 19.8°F (-6.8°C). Weather in January »
Weather in February
The last month of the winter, February, is a cold month in Decatur, Indiana, with an average temperature ranging between min 23.4°F (-4.8°C) and max 35.2°F (1.8°C). With February's arrival, Decatur notes an average high-temperature of an icy 35.2°F (1.8°C), closely following the trend of the preceding month. Weather in February »
Weather in March
The first month of the spring, March, is a chilly month in Decatur, Indiana, with an average temperature fluctuating between 32.4°F (0.2°C) and 46.9°F (8.3°C). Decatur's March weather shows an increase in high-temperatures, moving from February's icy 35.2°F (1.8°C) to a chilly 46.9°F (8.3°C). Weather in March »
Weather in April
April in Decatur, Indiana, is a mild spring month, with an average temperature ranging between max 59°F (15°C) and min 42.1°F (5.6°C). In April, the average high-temperature increases from a chilly 46.9°F (8.3°C) in March to a refreshing 59°F (15°C). Weather in April »
Weather in May
May, the last month of the spring in Decatur, is a pleasant month, with an average temperature fluctuating between 54°F (12.2°C) and 70.7°F (21.5°C). In Decatur, the average high-temperature in May rises, from a refreshing 59°F (15°C) in April, to an agreeable 70.7°F (21.5°C). Weather in May »
Weather in June
June, the first month of the summer in Decatur, is a warm month, with an average temperature varying between 78.1°F (25.6°C) and 61.3°F (16.3°C). June witnesses a subtle temperature ascent, adjusting from a pleasant 70.7°F (21.5°C) in May to a warm 78.1°F (25.6°C). Weather in June »
Weather in July
July, the same as June, is a moderately hot summer month in Decatur, Indiana, with an average temperature ranging between min 64°F (17.8°C) and max 81.1°F (27.3°C). July, on average, is the warmest month, registering a high temperature of 81.1°F (27.3°C) and a low of 64°F (17.8°C). During July, the heat index is estimated at a hot 87.8°F (31°C). Weather in July »
Weather in August
August, the last month of the summer in Decatur, is another warm month, with an average temperature ranging between max 79.2°F (26.2°C) and min 61.7°F (16.5°C). August denotes a minimal variation in the average high-temperature to a still moderately hot 79.2°F (26.2°C) from July's 81.1°F (27.3°C). Weather in August »
Weather in September
The first month of the autumn, September, is also a moderately hot month in Decatur, Indiana, with an average temperature fluctuating between 55.8°F (13.2°C) and 73.8°F (23.2°C). The arrival of September corresponds with a minor reduction in the average high-temperature, down from August's 79.2°F (26.2°C) to a still warm 73.8°F (23.2°C). Weather in September »
Weather in October
October, like September, in Decatur, Indiana, is another comfortable autumn month, with an average temperature fluctuating between 61.7°F (16.5°C) and 45.9°F (7.7°C). The commencement of October indicates a shift in the average high-temperature, receding from September's moderately hot 73.8°F (23.2°C) to an enjoyable 61.7°F (16.5°C). Weather in October »
Weather in November
The last month of the autumn, November, is another chilly month in Decatur, Indiana, with an average temperature ranging between max 47.5°F (8.6°C) and min 35.1°F (1.7°C). With the beginning of November, the average high-temperature shows a decrease, transitioning from a comfortable 61.7°F (16.5°C) in October to a chilly 47.5°F (8.6°C). Weather in November »
Weather in December
December, the first month of the winter in Decatur, is also a wintry month, with an average temperature ranging between min 27.1°F (-2.7°C) and max 36.7°F (2.6°C). A subtle decrease in the average high-temperature marks December, falling from November's chilly 47.5°F (8.6°C) to an icy 36.7°F (2.6°C). Weather in December »
Updated: Aug 9, 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 is the coldest time of year?
January is the month when Decatur experiences its coldest temperatures, averaging a high of 31.3°F (-0.4°C) and a low of 19.8°F (-6.8°C).
What is the most humid month?
January and February, with an average relative humidity of 83%, are most humid months.
How many days does it rain?
In Decatur, during the entire year, the rain falls for 159.4 days and collects up to 23.74" (603mm) of precipitation.
When does it snow?
January through April, October through December are months with snowfall.
How many days does it snow?
In Decatur, during the entire year, snow falls for 48.4 days and aggregates up to 10.47" (266mm) of snow.
What is the month with the least sunshine?
The month with the least sunshine is January, with an average of 3.5h of sunshine.
What is the driest month in Decatur?
The month with the least rainfall is February, when the rain falls for 7.5 days and typically collects 1.34" (34mm) of precipitation.
What is the snowiest month?
The month with the most snowfall is February, when snow falls for 12 days and typically aggregates up to 2.83" (72mm) of snow.
When is Daylight Saving Time (DST) in Decatur?
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?
May is the month with the most rainfall. Rain falls for 18.3 days and accumulates 3.03" (77mm) of precipitation.
When it does not snow?
May through September are months without snowfall.
When are the longest days?
The month with the longest days is June, with an average of 15h and 6min of daylight.
What are the months with the highest UV index?
The months with the highest UV index are June and July, with an average maximum UV index of 6.
What month is the hottest?
Decatur experiences its highest temperatures in July, with an average peak of 81.1°F (27.3°C) and a low of 64°F (17.8°C).
What month has the most sunshine?
The month with the most sunshine is July, with an average of 10.3h of sunshine.
What is the least humid month?
The least humid month is October, with an average relative humidity of 74%.
What is the month with the shortest days?
The month with the shortest days in Decatur is December, with an average of 9h and 18min of daylight.
What is the month with the lowest UV index?
The month with the lowest UV index is December, with an average maximum UV index of 1.
Average temperature
Decatur, IN
The warmest month (with the highest average high temperature) is July (81.1°F).
The month with the lowest average high temperature is January (31.3°F).
The month with the highest average low temperature is July (64°F).
The coldest month (with the lowest average low temperature) is January (19.8°F).
Average pressure
Decatur, IN
- Average pressure in January:
30.11"Hg - Average pressure in February:
30.09"Hg - Average pressure in March:
30.09"Hg - Average pressure in April:
29.96"Hg - Average pressure in May:
29.97"Hg - Average pressure in June:
29.93"Hg
- Average pressure in July:
29.97"Hg - Average pressure in August:
29.98"Hg - Average pressure in September:
30.04"Hg - Average pressure in October:
30.02"Hg - Average pressure in November:
30.12"Hg - Average pressure in December:
30.1"Hg
The month with the highest atmospheric pressure is November (30.12"Hg).
The month with the lowest atmospheric pressure is June (29.93"Hg).
Average wind speed
Decatur, IN
- Average wind speed in January:
10.6mph - Average wind speed in February:
10.3mph - Average wind speed in March:
9.7mph - Average wind speed in April:
10mph - Average wind speed in May:
8.3mph - Average wind speed in June:
7.5mph
- Average wind speed in July:
6.2mph - Average wind speed in August:
6mph - Average wind speed in September:
6.8mph - Average wind speed in October:
8.8mph - Average wind speed in November:
9.5mph - Average wind speed in December:
9.7mph
The windiest month (with the highest average wind speed) is January (10.6mph).
The calmest month (with the lowest average wind speed) is August (6mph).
Average humidity
Decatur, IN
The months with the highest relative humidity are January and February (83%).
The month with the lowest relative humidity is October (74%).
Average rainfall
Decatur, IN
- Average rainfall in January:
1.54" - Average rainfall in February:
1.34" - Average rainfall in March:
2.09" - Average rainfall in April:
2.68" - Average rainfall in May:
3.03" - Average rainfall in June:
2.52"
- Average rainfall in July:
2.28" - Average rainfall in August:
2.01" - Average rainfall in September:
1.57" - Average rainfall in October:
1.57" - Average rainfall in November:
1.5" - Average rainfall in December:
1.61"
The wettest month (with the highest rainfall) is May (3.03").
The driest month (with the least rainfall) is February (1.34").
Average rainfall days
Decatur, IN
- Average rainfall days in January:
8.3 days - Average rainfall days in February:
7.5 days - Average rainfall days in March:
12.7 days - Average rainfall days in April:
16.8 days - Average rainfall days in May:
18.3 days - Average rainfall days in June:
17.2 days
- Average rainfall days in July:
16.1 days - Average rainfall days in August:
15.1 days - Average rainfall days in September:
13.5 days - Average rainfall days in October:
12.6 days - Average rainfall days in November:
10.2 days - Average rainfall days in December:
11.1 days
The month with the highest number of rainy days is May (18.3 days).
The month with the least rainy days is February (7.5 days).
Average snowfall
Decatur, IN
The month with the highest snowfall is February (2.83").
The months with the least snowfall are May, June, July, August and September (0").
Average snowfall days
Decatur, IN
- Average snowfall days in January:
13.5 days - Average snowfall days in February:
12 days - Average snowfall days in March:
6.3 days - Average snowfall days in April:
1.8 days - Average snowfall days in May:
0.1 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:
0.3 days - Average snowfall days in November:
4.4 days - Average snowfall days in December:
10 days
The month with the highest number of snowfall days is January (13.5 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight / Average sunshine
Decatur, IN
- Average daylight in January:
9h and 4min - Average daylight in February:
10h and 4min - Average daylight in March:
12h and 0min - Average daylight in April:
13h and 2min - Average daylight in May:
14h and 3min - Average daylight in June:
15h and 1min
- Average daylight in July:
14h and 5min - Average daylight in August:
13h and 5min - Average daylight in September:
12h and 3min - Average daylight in October:
11h and 1min - Average daylight in November:
9h and 5min - Average daylight in December:
9h and 2min
The month with the longest days is June (Average daylight: 15h and 6min).
The month with the shortest days is December (Average daylight: 9h and 18min).
- Average sunshine in January:
3h and 3min - Average sunshine in February:
4h and 3min - Average sunshine in March:
5h and 5min - Average sunshine in April:
6h and 5min - Average sunshine in May:
8h and 4min - Average sunshine in June:
10h and 0min
- Average sunshine in July:
10h and 2min - Average sunshine in August:
9h and 4min - Average sunshine in September:
8h and 0min - Average sunshine in October:
6h and 1min - Average sunshine in November:
5h and 1min - Average sunshine in December:
3h and 5min
The month with the most sunshine is July (Average sunshine: 10h and 18min).
The month with the least sunshine is January (Average sunshine: 3h and 30min).
Average sunshine days
Decatur, IN
- Average sunshine days in January:
12.1 days - Average sunshine days in February:
10.2 days - Average sunshine days in March:
13 days - Average sunshine days in April:
10.8 days - Average sunshine days in May:
10.2 days - Average sunshine days in June:
10 days
- Average sunshine days in July:
11.9 days - Average sunshine days in August:
12.3 days - Average sunshine days in September:
14.5 days - Average sunshine days in October:
15.6 days - Average sunshine days in November:
16.3 days - Average sunshine days in December:
13 days
The month with the most sunshine days is November (16.3 days).
The month with the least sunshine days is June (10 days).
Average UV index
Decatur, IN
The months with the highest UV index are June and July (UV index 6).
The month with the lowest UV index is December (UV index 1).
Average cloud cover
Decatur, IN
The month with the most cloud cover is January (Cloud cover 64).
The months with the least cloud cover are July and August (Cloud cover 32).
Average visibility
Decatur, IN
The months with the highest visibility are February, March, April, May, June, July, September, October, November and December (6mi).
The months with the lowest visibility are January and August (5mi).
Decatur, Indiana, USA
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