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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, is a wintry winter month in Saint Clair, Missouri, with an average temperature ranging between max 39°F (3.9°C) and min 24.3°F (-4.3°C). January, noted for its average high-temperature of 39°F (3.9°C) and an average low-temperature of 24.3°F (-4.3°C), is considered the coldest month. Weather in January »
Weather in February
The last month of the winter, February, is a chilly month in Saint Clair, Missouri, with an average temperature fluctuating between 27.9°F (-2.3°C) and 43°F (6.1°C). As Saint Clair steps into February, the average high-temperature holds at a chilly 43°F (6.1°C), hinting at a minor fluctuation from the prior month. Weather in February »
Weather in March
The first month of the spring, March, is a fresh month in Saint Clair, Missouri, with temperature in the range of an average high of 55°F (12.8°C) and an average low of 37.9°F (3.3°C). Saint Clair's transition into March brings a rise in the average high-temperature, moving from a frosty 43°F (6.1°C) in February to a cool 55°F (12.8°C). Weather in March »
Weather in April
April in Saint Clair, Missouri, is an enjoyable spring month, with temperature in the range of an average low of 46.9°F (8.3°C) and an average high of 66.6°F (19.2°C). As March transitions into April, Saint Clair sees a rise in the average high-temperature, moving from a cool 55°F (12.8°C) to a refreshing 66.6°F (19.2°C). Weather in April »
Weather in May
May, the last month of the spring in Saint Clair, is a warm month, with temperature in the range of an average high of 76.3°F (24.6°C) and an average low of 56.3°F (13.5°C). The beginning of May signals a rise in the average high-temperature, moving from an enjoyable 66.6°F (19.2°C) in April to a warm 76.3°F (24.6°C). Weather in May »
Weather in June
June, the first month of the summer in Saint Clair, is still a warm month, with an average temperature fluctuating between 85.6°F (29.8°C) and 64.9°F (18.3°C). The onset of June marks an increase in the average high-temperature, moving from 76.3°F (24.6°C) in May to a still warm 85.6°F (29.8°C). Weather in June »
Weather in July
July is a tropical summer month in Saint Clair, Missouri, with an average temperature varying between 88.9°F (31.6°C) and 68°F (20°C). July is the month that records the highest temperatures, with averages ranging from a high of 88.9°F (31.6°C) to a low of 68°F (20°C). The heat index value for July is calculated to be a blistering 105.8°F (41°C). Weather in July »
Weather in August
August, the last month of the summer in Saint Clair, is another hot month, with temperature in the range of an average low of 65.8°F (18.8°C) and an average high of 87.3°F (30.7°C). The commencement of August notes an average high-temperature of a still hot 87.3°F (30.7°C), exhibiting little difference from the previous month. Weather in August »
Weather in September
The first month of the autumn, September, is also a moderately hot month in Saint Clair, Missouri, with temperature in the range of an average high of 80.2°F (26.8°C) and an average low of 59.2°F (15.1°C). September's arrival coincides with a soft drop in the average high-temperature, subtly decreasing from August's tropical 87.3°F (30.7°C) to a moderately hot 80.2°F (26.8°C). Weather in September »
Weather in October
October, the same as September, is another enjoyable autumn month in Saint Clair, Missouri, with an average temperature ranging between max 66.6°F (19.2°C) and min 48.2°F (9°C). The beginning of October involves a decrease in the average high-temperature, transitioning from a warm 80.2°F (26.8°C) in September to a comfortable 66.6°F (19.2°C). Weather in October »
Weather in November
The last month of the autumn, November, is also a fresh month in Saint Clair, Missouri, with temperature in the range of an average high of 53.8°F (12.1°C) and an average low of 37.2°F (2.9°C). Welcoming November, Saint Clair observes a shift in the average high-temperature, falling from October's comfortable 66.6°F (19.2°C) to a cool 53.8°F (12.1°C). Weather in November »
Weather in December
The first month of the winter, December, is still a chilly month in Saint Clair, Missouri, with an average temperature fluctuating between 29.8°F (-1.2°C) and 43.2°F (6.2°C). In December, the average high-temperature decreases from a cool 53.8°F (12.1°C) in November to a chilly 43.2°F (6.2°C). Weather in December »
Updated: Jul 10, 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 month is the coldest?
Saint Clair's temperature records reveal January as the coldest month, marked by average highs of 39°F (3.9°C) and lows of 24.3°F (-4.3°C).
What is the driest month?
The months with the least rainfall are January and February Rain falls for 5.9 days and accumulates 0.98" (25mm) of rain.
How much does it rain?
Throughout the year, there are 126.7 rainfall days, and 20.63" (524mm) of precipitation is accumulated.
When does it snow?
January through March, November and December are months with snowfall.
How many days does it snow?
Throughout the year, there are 19.3 snowfall days, and 4.17" (106mm) of snow is accumulated.
What are the months with the least sunshine?
The months with the least sunshine are January and February, with an average of 4.7h of sunshine.
What is the month with the lowest UV index?
The months with the lowest UV index are January, February, November and December, with an average maximum UV index of 2.
When does it snow the most?
February is the month with the most snowfall. Snow falls for 5.7 days and accumulates 1.57" (40mm) of snow.
When is Daylight Saving Time (DST)?
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 ends Sunday, November 3. 2024, at 2:00 am, and the time zone reverts from CDT to CST.
What is the rainiest month?
The months with the most rainfall are April and May, with an average 2.48" (63mm) of precipitation.
When it does not snow?
April through October are months without snowfall.
What is the most humid month?
May is the most humid month, with an average relative humidity of 78%.
What are the months with the highest UV index?
The months with the highest UV index are May through August, with an average maximum UV index of 6.
When are the longest days?
The month with the longest days is June, with an average of 14h and 48min of daylight.
What are the months with the most sunshine?
The months with the most sunshine are June and July, with an average of 10.4h of sunshine.
What part of the year is the hottest?
July registers as the month with the average highest temperatures, reaching 88.9°F (31.6°C) at its peak and 68°F (20°C) at the lowest.
What is the least humid month?
October is the least humid month, with an average relative humidity of 72%.
What is the month with the shortest days?
December has the shortest days of the year, with an average of 9h and 30min of daylight.
Average temperature
Saint Clair, MO
The warmest month (with the highest average high temperature) is July (88.9°F).
The month with the lowest average high temperature is January (39°F).
The month with the highest average low temperature is July (68°F).
The coldest month (with the lowest average low temperature) is January (24.3°F).
Average pressure
Saint Clair, MO
- Average pressure in January:
30.16"Hg - Average pressure in February:
30.12"Hg - Average pressure in March:
30.07"Hg - Average pressure in April:
29.93"Hg - Average pressure in May:
29.95"Hg - Average pressure in June:
29.92"Hg
- Average pressure in July:
29.97"Hg - Average pressure in August:
29.97"Hg - Average pressure in September:
30.02"Hg - Average pressure in October:
30.03"Hg - Average pressure in November:
30.12"Hg - Average pressure in December:
30.13"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).
Average wind speed
Saint Clair, MO
- Average wind speed in January:
8.5mph - Average wind speed in February:
8.3mph - Average wind speed in March:
8.2mph - Average wind speed in April:
8.2mph - Average wind speed in May:
6.7mph - Average wind speed in June:
6.1mph
- Average wind speed in July:
5.3mph - Average wind speed in August:
5.3mph - Average wind speed in September:
5.7mph - Average wind speed in October:
7mph - Average wind speed in November:
7.8mph - Average wind speed in December:
8mph
The windiest month (with the highest average wind speed) is January (8.5mph).
The calmest months (with the lowest average wind speed) are July and August (5.3mph).
Average humidity
Saint Clair, MO
The month with the highest relative humidity is May (78%).
The month with the lowest relative humidity is October (72%).
Average rainfall
Saint Clair, MO
- Average rainfall in January:
0.98" - Average rainfall in February:
0.98" - Average rainfall in March:
1.65" - Average rainfall in April:
2.48" - Average rainfall in May:
2.48" - Average rainfall in June:
2.01"
- Average rainfall in July:
2.13" - Average rainfall in August:
2.44" - Average rainfall in September:
1.46" - Average rainfall in October:
1.65" - Average rainfall in November:
1.22" - Average rainfall in December:
1.14"
The wettest months (with the highest rainfall) are April and May (2.48").
The driest months (with the least rainfall) are January and February (0.98").
Average rainfall days
Saint Clair, MO
- Average rainfall days in January:
5.9 days - Average rainfall days in February:
7.1 days - Average rainfall days in March:
11.7 days - Average rainfall days in April:
12.9 days - Average rainfall days in May:
15.4 days - Average rainfall days in June:
12.8 days
- Average rainfall days in July:
13.5 days - Average rainfall days in August:
13.8 days - Average rainfall days in September:
9.8 days - Average rainfall days in October:
9.2 days - Average rainfall days in November:
8.3 days - Average rainfall days in December:
6.3 days
The month with the highest number of rainy days is May (15.4 days).
The month with the least rainy days is January (5.9 days).
Average snowfall
Saint Clair, MO
The month with the highest snowfall is February (1.57").
The months with the least snowfall are April, May, June, July, August, September and October (0").
Average snowfall days
Saint Clair, MO
- Average snowfall days in January:
6.2 days - Average snowfall days in February:
5.7 days - Average snowfall days in March:
2.2 days - Average snowfall days in April:
0.2 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:
0.1 days - Average snowfall days in October:
0.1 days - Average snowfall days in November:
1.1 days - Average snowfall days in December:
3.7 days
The month with the highest number of snowfall days is January (6.2 days).
The months with the least snowfall days are May, June, July and August (0 days).
Average daylight / Average sunshine
Saint Clair, MO
- 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 1min - Average daylight in May:
14h and 2min - Average daylight in June:
14h and 5min
- Average daylight in July:
14h and 3min - 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 1min - Average daylight in December:
9h and 3min
The month with the longest days is June (Average daylight: 14h and 48min).
The month with the shortest days is December (Average daylight: 9h and 30min).
- Average sunshine in January:
4h and 4min - Average sunshine in February:
4h and 4min - Average sunshine in March:
6h and 2min - Average sunshine in April:
8h and 2min - Average sunshine in May:
9h and 1min - Average sunshine in June:
10h and 2min
- Average sunshine in July:
10h and 2min - Average sunshine in August:
10h and 0min - Average sunshine in September:
9h and 2min - Average sunshine in October:
5h and 5min - Average sunshine in November:
5h and 3min - Average sunshine in December:
4h and 5min
The months with the most sunshine are June and July (Average sunshine: 10h and 24min).
The months with the least sunshine are January and February (Average sunshine: 4h and 42min).
Average sunshine days
Saint Clair, MO
- Average sunshine days in January:
20.6 days - Average sunshine days in February:
16.9 days - Average sunshine days in March:
16.1 days - Average sunshine days in April:
15.7 days - Average sunshine days in May:
13.7 days - Average sunshine days in June:
14.2 days
- Average sunshine days in July:
14.8 days - Average sunshine days in August:
15.2 days - Average sunshine days in September:
18.1 days - Average sunshine days in October:
20 days - Average sunshine days in November:
20.2 days - Average sunshine days in December:
20.5 days
The month with the most sunshine days is January (20.6 days).
The month with the least sunshine days is May (13.7 days).
Average UV index
Saint Clair, MO
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
Saint Clair, MO
The months with the most cloud cover are January and February (Cloud cover 49).
The months with the least cloud cover are June and July (Cloud cover 29).
Average visibility
Saint Clair, MO
The months with the highest visibility are January, February, March, April, June, July, October, November and December (6mi).
The months with the lowest visibility are May, August and September (5mi).
Saint Clair, Missouri, USA
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