March weather forecast
Decatur, IL

Weather in March

The first month of the spring, March, is a cool month in Decatur, Illinois, with temperature in the range of an average high of 50.5°F (10.3°C) and an average low of 35.6°F (2°C).

Temperature

In March, the average high-temperature rises, from a cold 37.8°F (3.2°C) in February, to a fresh 50.5°F (10.3°C). In Decatur, Illinois,, the average low-temperature is 35.6°F (2°C).

Humidity

The average relative humidity in March is 75%.

Rainfall

In Decatur, in March, during 11.6 rainfall days, 1.3" (33mm) of precipitation is typically accumulated. In Decatur, during the entire year, the rain falls for 130.2 days and collects up to 16.34" (415mm) of precipitation.

Snowfall

Months with snowfall in Decatur, Illinois, are January through April, November and December. In Decatur, during 2.6 snowfall days, 0.98" (25mm) of snow is typically accumulated. In Decatur, during the entire year, snow falls for 23.1 days, and aggregates up to 5.67" (144mm) of snow.

Daylight

The average length of the day in March is 12h.

Sunshine

In Decatur, the average sunshine is 6.4h.

UV index

In March, the average daily maximum UV index in Decatur, Illinois, is 3. A UV Index reading of 3 to 5 represents a moderate health risk from the exposure to the Sun's UV rays for average individuals.
Note: The daily maximum UV index of 3 interpret into the following advice:
Take precautions - Protection against sunburn is recommended. The Sun's most intense and consequently most harmful UV radiation during midday hours should be decreased by minimizing exposure and seeking shade. Sun-protective clothing, a long-sleeved shirt and pants, a wide-brimmed hat, and UVA and UVB-blocking sunglasses are particularly helpful in blocking UV radiation's harmful effects. Caution! The reflection of snow can nearly double the intensity of the Sun's UV radiation.
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FAQ

What is the average humidity in March in Decatur?

In March, the average relative humidity in Decatur, Illinois, is 75%.

How many days does it rain in March in Decatur?

In Decatur, in March, it is raining for 11.6 days, with typically 1.3" (33mm) of accumulated precipitation.

How many days does it snow in March in Decatur?

In March, in Decatur, it is snowing for 2.6 days. Throughout March, 0.98" (25mm) of snow is accumulated.

How many hours of daylight does Decatur have in March?

In March, the average length of the day is 12h.

How many hours of sunshine does Decatur have in March?

The average sunshine in March in Decatur is 6.4h.

What is the UV index intensity in March in Decatur?

In Decatur, Illinois, the average daily maximum UV index in March is 3. A UV Index value of 3 to 5 symbolizes a medium hazard to health from unsafe exposure to the Sun's UV rays.

Average temperature in March
Decatur, IL

Average temperature in March - Decatur, IL
  • Average high temperature in March: 50.5°F

The warmest month (with the highest average high temperature) is July (82°F).
The month with the lowest average high temperature is January (32.9°F).

  • Average low temperature in March: 35.6°F

The month with the highest average low temperature is July (65.7°F).
The coldest month (with the lowest average low temperature) is January (21.2°F).

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Average pressure in March
Decatur, IL

Average pressure in March - Decatur, IL
  • Average pressure in March: 30.08"

The month with the highest atmospheric pressure is January (30.15").
The month with the lowest atmospheric pressure is June (29.92").

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Average wind speed in March
Decatur, IL

Average wind speed in March - Decatur, IL
  • Average wind speed in March: 10.3mph

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).

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Average humidity in March
Decatur, IL

Average humidity in March - Decatur, IL
  • Average humidity in March: 75%

The month with the highest relative humidity is July (84%).
The month with the lowest relative humidity is October (70%).

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Average rainfall in March
Decatur, IL

Average rainfall in March - Decatur, IL
  • Average rainfall in March: 1.3"

The wettest month (with the highest rainfall) is May (2.01").
The driest months (with the least rainfall) are February and December (0.87").

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Average rainfall days in March
Decatur, IL

Average rainfall days in March - Decatur, IL
  • Average rainfall days in March: 11.6 days

The month with the highest number of rainy days is May (17 days).
The month with the least rainy days is February (5.8 days).

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Average snowfall in March
Decatur, IL

Average snowfall in March - Decatur, IL
  • Average snowfall in March: 0.98"

The month with the highest snowfall is January (1.85").
Months with the least snowfall are May, June, July, August, September and October (0").

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Average snowfall days in March
Decatur, IL

Average snowfall days in March - Decatur, IL
  • Average snowfall days in March: 2.6 days

The month with the highest number of snowfall days is January (7.2 days).
Months with the least snowfall days are May, June, July, August, September and October (0 days).

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Average daylight in March /
Average sunshine in March
Decatur, IL

Average daylight in March / Average sunshine in March - Decatur, IL
  • Average daylight in March: 12h

The month with the longest days is June (Average daylight: 15h).
The month with the shortest days is December (Average daylight: 9.4h).

  • Average sunshine in March: 6.4h

The month with the most sunshine is June (Average sunshine: 10.4h).
The month with the least sunshine is January (Average sunshine: 4.1h).

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Average sunshine days in March
Decatur, IL

Average sunshine days in March - Decatur, IL
  • Average sunshine days in March: 16.4 days

The month with the most sunshine days is October (19.8 days).
The month with the least sunshine days is May (11.5 days).

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Average UV index in March
Decatur, IL

Average UV index in March - Decatur, IL
  • Average UV index in March: 3

Months with the highest UV index are June, July and August (UV index 6).
Months with the lowest UV index are January, February, November and December (UV index 2).

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Average cloud cover in March
Decatur, IL

Average cloud cover in March - Decatur, IL
  • Average cloud cover in March: 47

The month with the most cloud cover is January (Cloud cover 56).
The month with the least cloud cover is September (Cloud cover 29).

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Average visibility in March
Decatur, IL

Average visibility in March - Decatur, IL
  • Average visibility in March: 6mi

Months with the highest visibility are January, February, March, April, May, June, September, October, November and December (6mi).
Months with the lowest visibility are July and August (5mi).

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