March weather forecast
O'Fallon, MO

Weather in March

The first month of the spring, March, is a fresh month in O'Fallon, Missouri, with an average temperature varying between 37.9°F (3.3°C) and 54.1°F (12.3°C).

Temperature

In March, the average high-temperature rises from a cold 41.9°F (5.5°C) in February to a fresh 54.1°F (12.3°C). In O'Fallon, in March, the average low-temperature is 37.9°F (3.3°C).

Humidity

In March, the average relative humidity is 75%.

Rainfall

In O'Fallon, during 11.8 rainfall days, 1.5" (38mm) of precipitation is typically accumulated. In O'Fallon, during the entire year, the rain falls for 132.3 days and collects up to 21.06" (535mm) of precipitation.

Snowfall

January through March, November and December are months with snowfall in O'Fallon. March is the last month it regularly snows in O'Fallon. During 1.9 snowfall days, O'Fallon aggregates 0.59" (15mm) of snow. Throughout the year, in O'Fallon, there are 19 snowfall days, and 4.13" (105mm) of snow is accumulated.

Daylight

In O'Fallon, the average length of the day in March is 11h and 59min.
On the first day of the month, sunrise is at 6:34 am and sunset at 5:55 pm CST. On the last day of March, in O'Fallon, sunrise is at 6:48 am and sunset at 7:25 pm CDT.
Note: On Sunday, March 13. 2022, at 2:00 am, Daylight Saving Time starts, and the time zone changes from CST to CDT. Daylight Saving Time lasts until Sunday, November 6. 2022, at 2:00 am; consequently, the time zone reverts from CDT to CST.

Sunshine

In O'Fallon, the average sunshine in March is 6.6h.

UV index

In O'Fallon, the average daily maximum UV index in March is 4. A UV Index estimate of 3 to 5 represents a moderate threat to health from exposure to the Sun's UV rays for average individuals.
Note: The daily maximum UV index of 4 in March interpret into the following advice:
Take precautions. Light skin individuals may get burned in less than 30 minutes. The Sun's most intense and consequently most harmful UV radiation during midday hours should be decreased by minimizing exposure and seeking shade. 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. Tightly woven, loose-fitting clothes provide additional protection from the Sun. Beware! The strength of the UV rays is increased nearly double-fold by the reflection of the snow.
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FAQ

What is the average humidity in March in O'Fallon?

In O'Fallon, the average relative humidity in March is 75%.

How many days does it rain in March in O'Fallon?

In O'Fallon, during March, the rain falls for 11.8 days and regularly aggregates up to 1.5" (38mm) of precipitation.

What is the last month it snows in O'Fallon?

March is the last month it regularly snows in O'Fallon, Missouri. During 1.9 snowfall days, in March, O'Fallon aggregates 0.59" (15mm) of snow.

What is the average length of the day in March in O'Fallon?

In March, the average day length is 11h and 59min.

When are sunrise and sunset in March in O'Fallon?

In March, on the first day of the month, sunrise is at 6:34 am and sunset at 5:55 pm CST. On the last day of the month, in O'Fallon, sunrise is at 6:48 am and sunset at 7:25 pm CDT.

When does Daylight Saving Time (DST) start in March in O'Fallon?

On Sunday, March 13. 2022, at 2:00 am, Daylight Saving Time starts in O'Fallon, and the time zone changes from CST to CDT. DST ends Sunday, November 6. 2022, at 2:00 am.

How long on average sun shines in March in O'Fallon?

In March, the average sunshine duration in O'Fallon is 6.6h.

What is the UV index reading in March in O'Fallon?

The average daily maximum UV index in March in O'Fallon, Missouri, is 4. A UV Index reading of 3 to 5 represents a moderate vulnerability from exposure to Sun's UV rays.
Average humidity
Average rainfall days
Average snowfall days
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in March
O'Fallon, MO

Average temperature in March - O
  • Average high temperature in March: 54.1°F

The warmest month (with the highest average high temperature) is July (87.1°F).
The month with the lowest average high temperature is January (37.4°F).

  • Average low temperature in March: 37.9°F

The month with the highest average low temperature is July (68.5°F).
The coldest month (with the lowest average low temperature) is January (23.7°F).

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Average pressure in March
O'Fallon, MO

Average pressure in March - O
  • Average pressure in March: 30.07"Hg

The month with the highest atmospheric pressure is January (30.16"Hg).
The month with the lowest atmospheric pressure is June (29.92"Hg).

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Average wind speed in March
O'Fallon, MO

Average wind speed in March - O
  • Average wind speed in March: 8.8mph

The windiest month (with the highest average wind speed) is January (9.1mph).
The calmest month (with the lowest average wind speed) is July (5.5mph).

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Average humidity in March
O'Fallon, MO

Average humidity in March - O
  • Average humidity in March: 75%

The month with the highest relative humidity is May (79%).
The month with the lowest relative humidity is October (70%).

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Average rainfall in March
O'Fallon, MO

Average rainfall in March - O
  • Average rainfall in March: 1.5"

The wettest month (with the highest rainfall) is May (2.76").
The driest month (with the least rainfall) is December (0.91").

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Average rainfall days in March
O'Fallon, MO

Average rainfall days in March - O
  • Average rainfall days in March: 11.8 days

The month with the highest number of rainy days is May (15.7 days).
The month with the least rainy days is February (6.8 days).

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Average snowfall in March
O'Fallon, MO

Average snowfall in March - O
  • Average snowfall in March: 0.59"

The month with the highest snowfall is February (1.61").
The months with the least snowfall are April, May, June, July, August, September and October (0").

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Average snowfall days in March
O'Fallon, MO

Average snowfall days in March - O
  • Average snowfall days in March: 1.9 days

The months with the highest number of snowfall days are January and February (5.8 days).
The 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
O'Fallon, MO

Average daylight in March / Average sunshine in March - O
  • Average daylight in March: 11h and 59min

The month with the longest days is June (Average daylight: 14h and 50min).
The month with the shortest days is December (Average daylight: 9h and 30min).

  • Average sunshine in March: 6h and 36min

The month with the most sunshine is June (Average sunshine: 10h and 30min).
The months with the least sunshine are January and February (Average sunshine: 4h and 42min).

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Average sunshine days in March
O'Fallon, MO

Average sunshine days in March - O
  • Average sunshine days in March: 16.1 days

The month with the most sunshine days is December (20.6 days).
The month with the least sunshine days is July (12.6 days).

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Average UV index in March
O'Fallon, MO

Average UV index in March - O
  • Average UV index in March: 4

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).

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Average cloud cover in March
O'Fallon, MO

Average cloud cover in March - O
  • Average cloud cover in March: 47

The month with the most cloud cover is January (Cloud cover 50).
The months with the least cloud cover are June, July, August and September (Cloud cover 28).

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Average visibility in March
O'Fallon, MO

Average visibility in March - O
  • Average visibility in March: 6mi

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).

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