March weather forecastDecatur, IL

March

Weather in March

March in Decatur, Illinois greets the advent of spring with a rewarding rise in temperature. With the highest daily average temperature blossoming to reach 50.5°F (10.3°C), the snowfall amount dwindens to less than 1 inch, signifying the retreat of the winter onslaught. The populace breathes a sigh of relief as greenery begins to reclaim its rightful status, and brighter days outshine the glacial gloom. Days grow longer, cheapening the reliance on artificial light during the daytime. Despite the volatility, the month's weather echoes much-anticipated hints of the warmer, sunnier days to come.

Temperature

March's onset is marked by a temperature increase, moving from a wintry 37.8°F (3.2°C) in February to a cool 50.5°F (10.3°C). In March, Decatur reports a consistent average low-temperature of 35.6°F (2°C) during the nights.

Humidity

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

Rainfall

In Decatur, during March, the rain falls for 11.6 days and regularly aggregates up to 1.3" (33mm) of precipitation. 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 are January through April, November and December. In Decatur, during March, snow falls for 2.6 days and regularly aggregates up to 0.98" (25mm) of snow. 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 11h and 59min.
On the first day of March, sunrise is at 6:27 am and sunset at 5:48 pm CST. On the last day of the month, sunrise is at 6:40 am and sunset at 7:19 pm CDT.
Note: On Sunday, March 10. 2024, at 2:00 am, Daylight Saving Time starts, and the time zone changes from CST to CDT. Daylight Saving Time lasts until Sunday, November 3. 2024, at 2:00 am; consequently, the time zone reverts from CDT to CST.

Sunshine

The average sunshine in March in Decatur is 6.4h.

UV index

In March, the average daily maximum UV index in Decatur, Illinois, is 3. A UV Index of 3 to 5 symbolizes a medium health hazard from unsafe exposure to UV radiation for ordinary individuals.
Note: A maximum high UV index of 3 in March translates into the following recommendations:
Heed the precautions - Suggestions to avoid sunburn are made. UV radiation is strongest from the Sun during midday; protect yourself by staying in shaded areas. A wide-brim hat offers excellent sun protection for the eyes, ears, face, and neck. Sunglasses with UVA and UVB protection significantly reduce eye damage from sun exposure. Consider carefully! The reflective quality of snow can almost double the intensity of the Sun's UV radiation.

Updated: Feb 12, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

The average high-temperature, in March, in Decatur, is 50.5°F (10.3°C), while the average low-temperature is 35.6°F (2°C).

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

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

In Decatur, in March, during 2.6 snowfall days, 0.98" (25mm) of snow is typically accumulated.

The average day length in March is 11h and 59min.

On the first day of March in Decatur, Illinois, sunrise is at 6:27 am and sunset at 5:48 pm CST. On the last day of the month, sunrise is at 6:40 am and sunset at 7:19 pm CDT.

On Sunday, March 10. 2024, at 2:00 am, Daylight Saving Time starts in Decatur, and the time zone changes from CST to CDT. DST ends Sunday, November 3. 2024, at 2:00 am.

The average sunshine duration in March in Decatur, Illinois, is 6.4h.

The average daily maximum UV index in March in Decatur is 3. A UV Index value of 3 to 5 symbolizes a moderate health threat from unsafe exposure to Sun's UV rays.

Today

Tomorrow

Long-term

Year J F March A M J J A S O N D

Feb

March

Apr

Average high temperature

37.8°F

50.5°F

61.9°F

Average low temperature

Average pressure

Average wind speed

Average max. wind speed

11.2mph

11mph

11.4mph

Average wind speed gusts

Average humidity

Average rainfall

Average rainfall days

Average snowfall

Average snowfall days

Average daylight

Average sunshine

Average sunshine days

16.7

16.4

14.5

Average UV index

Average cloud cover

Average visibility

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).

Average pressure in March
Decatur, IL

Average pressure in March: 30.08"Hg

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

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).

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%).

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").

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).

Average snowfall in March
Decatur, IL

Average snowfall in March: 0.98"

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

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).
The months with the least snowfall days are May, June, July, August, September and October (0 days).

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

Average daylight in March: 12h and 0min

The month with the longest days is June (Average daylight: 15h and 0min).
The month with the shortest days is December (Average daylight: 9h and 24min).

Average sunshine in March: 6h and 24min

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 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).

Average UV index in March
Decatur, IL

Average UV index in March: 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 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).

Average visibility in March
Decatur, IL

Average visibility in March: 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).