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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
Climate and monthly weather forecast
Weather in January
January, the same as December, is another cold winter month in Saint Charles, Missouri, with an average temperature ranging between max 2.9°C and min -4.3°C. Saint Charles's January weather reaches an average high of 2.9°C and an average low of -4.3°C, making it the coldest month. Weather in January »
Weather in February
The last month of the winter, February, is another cold month in Saint Charles, Missouri, with an average temperature varying between -2.5°C and 5.6°C. Saint Charles registers an average high-temperature of a still cold 5.6°C with the arrival of February, showing minor deviation from the preceding month. Weather in February »
Weather in March
March, the first month of the spring in Saint Charles, is a fresh month, with temperature in the range of an average low of 3.3°C and an average high of 12.3°C. Saint Charles's weather in March shows a rise in the average high-temperature, moving up from February's icy 5.6°C to a fresh 12.3°C. Weather in March »
Weather in April
April in Saint Charles, Missouri, is a refreshing spring month, with an average temperature fluctuating between 18.5°C and 8.9°C. April comes with an increase, with the average high-temperature moving from a fresh 12.3°C in March to a comfortable 18.5°C. Weather in April »
Weather in May
May, the last month of the spring in Saint Charles, is a moderately hot month, with an average temperature varying between 14.2°C and 23.8°C. With the onset of May, Saint Charles sees a temperature rise, with the average high-temperature moving from April's refreshing 18.5°C to a warm 23.8°C. Weather in May »
Weather in June
June, the first month of the summer in Saint Charles, is also a moderately hot month, with temperature in the range of an average high of 29°C and an average low of 19.3°C. The onset of June brings a rise in the average high-temperature, elevating from a moderately hot 23.8°C in May to a still warm 29°C. Weather in June »
Weather in July
July is a hot summer month in Saint Charles, Missouri, with an average temperature varying between 30.4°C and 20.5°C. In Saint Charles, the peak average temperatures are observed in July, with a high of 30.4°C and a low of 20.5°C. The average heat index in July is calculated to be a fiery hot 38°C. Weather in July »
Weather in August
The last month of the summer, August, is also a moderately hot month in Saint Charles, Missouri, with an average temperature ranging between max 29.7°C and min 19.5°C. August's climate shows a minor adjustment in average high-temperatures to a moderately hot 29.7°C from July's 30.4°C. Weather in August »
Weather in September
The first month of the autumn, September, is still a warm month in Saint Charles, Missouri, with an average temperature varying between 15.6°C and 26.5°C. Saint Charles's weather subtly changes with the onset of September, barely falling from 29.7°C in August to a still warm 26.5°C. Weather in September »
Weather in October
October, like September, in Saint Charles, Missouri, is another refreshing autumn month, with an average temperature fluctuating between 9.7°C and 18.9°C. October shows a mild decline in the average high-temperature, falling from September's warm 26.5°C to a refreshing 18.9°C. Weather in October »
Weather in November
November, the last month of the autumn in Saint Charles, is another cool month, with temperature in the range of an average low of 3.3°C and an average high of 11.8°C. November brings a decrease in the average high-temperature, shifting from an enjoyable 18.9°C in October to a fresh 11.8°C. Weather in November »
Weather in December
The first month of the winter, December, is also a wintry month in Saint Charles, Missouri, with an average temperature ranging between max 5.6°C and min -1.1°C. Observing a mild shift, the average high-temperature during December reduces from November's fresh 11.8°C to an icy 5.6°C. Weather in December »
Updated: Aug 26, 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 are the coldest months?
In Saint Charles, the average lowest temperatures are observed in January, with a high of 2.9°C and a low of -4.3°C.
How much does it rain?
Throughout the year, there are 141.9 rainfall days, and 703mm of precipitation is accumulated.
When does it snow in Saint Charles?
January through March, November and December are months with snowfall in Saint Charles.
How much does it snow?
In Saint Charles, during the entire year, snow falls for 21.6 days and aggregates up to 171mm of snow.
What is the month with the least sunshine?
January has the least sunshine of the year, with an average of 4.6h of sunshine.
What are the months with the lowest UV index?
The months with the lowest UV index are January, February and December, with an average maximum UV index of 2.
What is the driest month?
The month with the least rainfall is February, when the rain falls for 7.3 days and typically collects 36mm of precipitation.
When does it snow the most?
February is the month with the most snowfall. Snow falls for 6.2 days and accumulates 52mm 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.
When it does not snow?
In Saint Charles, Missouri, snow does not fall in April through October.
What is the most humid month?
May is the most humid month in Saint Charles, Missouri, with an average relative humidity of 77%.
What is the wettest month?
The month with the most rainfall in Saint Charles, Missouri, is May, when the rain falls for 16 days and typically aggregates up to 84mm of precipitation.
When is the highest UV index?
May through August, with an average maximum UV index of 6, are months with the highest UV index.
When are the longest days?
June has the longest days of the year, with an average of 14h and 48min of daylight.
What is the hottest time of year?
July, with its high-temperature average of 30.4°C and a low-temperature average of 20.5°C, is the warmest month in Saint Charles, Missouri.
What month has the most sunshine?
The month with the most sunshine in Saint Charles is July, with an average of 10.6h of sunshine.
What is the least humid month?
October is the least humid month, with an average relative humidity of 70%.
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 Charles, MO
The warmest month (with the highest average high temperature) is July (30.4°C).
The month with the lowest average high temperature is January (2.9°C).
The month with the highest average low temperature is July (20.5°C).
The coldest month (with the lowest average low temperature) is January (-4.3°C).
Average pressure
Saint Charles, MO
- Average pressure in January:
1021.2mbar - Average pressure in February:
1020mbar - Average pressure in March:
1018.3mbar - Average pressure in April:
1013.8mbar - Average pressure in May:
1014.3mbar - Average pressure in June:
1013.2mbar
- Average pressure in July:
1014.8mbar - Average pressure in August:
1015mbar - Average pressure in September:
1016.7mbar - Average pressure in October:
1017mbar - Average pressure in November:
1020mbar - Average pressure in December:
1020.3mbar
The month with the highest atmospheric pressure is January (1021.2mbar).
The month with the lowest atmospheric pressure is June (1013.2mbar).
Average wind speed
Saint Charles, MO
- Average wind speed in January:
14.9km/h - Average wind speed in February:
14.7km/h - Average wind speed in March:
14.4km/h - Average wind speed in April:
14.4km/h - Average wind speed in May:
11.7km/h - Average wind speed in June:
10.4km/h
- Average wind speed in July:
9km/h - Average wind speed in August:
9km/h - Average wind speed in September:
9.8km/h - Average wind speed in October:
12.7km/h - Average wind speed in November:
13.7km/h - Average wind speed in December:
13.9km/h
The windiest month (with the highest average wind speed) is January (14.9km/h).
The calmest months (with the lowest average wind speed) are July and August (9km/h).
Average humidity
Saint Charles, MO
The month with the highest relative humidity is May (77%).
The month with the lowest relative humidity is October (70%).
Average rainfall
Saint Charles, MO
The wettest month (with the highest rainfall) is May (84mm).
The driest month (with the least rainfall) is February (36mm).
Average rainfall days
Saint Charles, MO
- Average rainfall days in January:
7.8 days - Average rainfall days in February:
7.3 days - Average rainfall days in March:
12.9 days - Average rainfall days in April:
14.8 days - Average rainfall days in May:
16 days - Average rainfall days in June:
14.8 days
- Average rainfall days in July:
16.3 days - Average rainfall days in August:
13.2 days - Average rainfall days in September:
12.3 days - Average rainfall days in October:
10.3 days - Average rainfall days in November:
8.9 days - Average rainfall days in December:
7.3 days
The month with the highest number of rainy days is July (16.3 days).
The months with the least rainy days are February and December (7.3 days).
Average snowfall
Saint Charles, MO
The month with the highest snowfall is February (52mm).
The months with the least snowfall are April, May, June, July, August, September and October (0mm).
Average snowfall days
Saint Charles, MO
- Average snowfall days in January:
6.8 days - Average snowfall days in February:
6.2 days - Average snowfall days in March:
2.4 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 days - Average snowfall days in October:
0.1 days - Average snowfall days in November:
1.5 days - Average snowfall days in December:
4.4 days
The month with the highest number of snowfall days is January (6.8 days).
The months with the least snowfall days are May, June, July, August and September (0 days).
Average daylight / Average sunshine
Saint Charles, 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 4min - 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 3min - Average sunshine in April:
8h and 4min - Average sunshine in May:
9h and 3min - Average sunshine in June:
10h and 3min
- Average sunshine in July:
10h and 4min - Average sunshine in August:
10h and 2min - Average sunshine in September:
9h and 4min - Average sunshine in October:
6h and 1min - Average sunshine in November:
5h and 3min - Average sunshine in December:
4h and 5min
The month with the most sunshine is July (Average sunshine: 10h and 36min).
The month with the least sunshine is January (Average sunshine: 4h and 36min).
Average sunshine days
Saint Charles, MO
- Average sunshine days in January:
18.7 days - Average sunshine days in February:
14.7 days - Average sunshine days in March:
14.4 days - Average sunshine days in April:
13.2 days - Average sunshine days in May:
12.1 days - Average sunshine days in June:
11.8 days
- Average sunshine days in July:
11.4 days - Average sunshine days in August:
13.4 days - Average sunshine days in September:
15.3 days - Average sunshine days in October:
19.2 days - Average sunshine days in November:
18.2 days - Average sunshine days in December:
18.8 days
The month with the most sunshine days is October (19.2 days).
The month with the least sunshine days is July (11.4 days).
Average UV index
Saint Charles, 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 and December (UV index 2).
Average cloud cover
Saint Charles, MO
The month with the most cloud cover is January (Cloud cover 50).
The month with the least cloud cover is August (Cloud cover 27).
Average visibility
Saint Charles, MO
The months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (9km).
The months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (9km).