Climate and monthly weather forecastSaint Charles, MO
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 37.2°F (2.9°C) and min 24.3°F (-4.3°C). Saint Charles's January weather reaches an average high of 37.2°F (2.9°C) and an average low of 24.3°F (-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 27.5°F (-2.5°C) and 42.1°F (5.6°C). Saint Charles registers an average high-temperature of a still cold 42.1°F (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 37.9°F (3.3°C) and an average high of 54.1°F (12.3°C). Saint Charles's weather in March shows a rise in the average high-temperature, moving up from February's icy 42.1°F (5.6°C) to a fresh 54.1°F (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 65.3°F (18.5°C) and 48°F (8.9°C). April comes with an increase, with the average high-temperature moving from a fresh 54.1°F (12.3°C) in March to a comfortable 65.3°F (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 57.6°F (14.2°C) and 74.8°F (23.8°C). With the onset of May, Saint Charles sees a temperature rise, with the average high-temperature moving from April's refreshing 65.3°F (18.5°C) to a warm 74.8°F (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 84.2°F (29°C) and an average low of 66.7°F (19.3°C). The onset of June brings a rise in the average high-temperature, elevating from a moderately hot 74.8°F (23.8°C) in May to a still warm 84.2°F (29°C). Weather in June »Weather in July
July is a hot summer month in Saint Charles, Missouri, with an average temperature varying between 86.7°F (30.4°C) and 68.9°F (20.5°C). In Saint Charles, the peak average temperatures are observed in July, with a high of 86.7°F (30.4°C) and a low of 68.9°F (20.5°C). The average heat index in July is calculated to be a fiery hot 100.4°F (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 85.5°F (29.7°C) and min 67.1°F (19.5°C). August's climate shows a minor adjustment in average high-temperatures to a moderately hot 85.5°F (29.7°C) from July's 86.7°F (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 60.1°F (15.6°C) and 79.7°F (26.5°C). Saint Charles's weather subtly changes with the onset of September, barely falling from 85.5°F (29.7°C) in August to a still warm 79.7°F (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 49.5°F (9.7°C) and 66°F (18.9°C). October shows a mild decline in the average high-temperature, falling from September's warm 79.7°F (26.5°C) to a refreshing 66°F (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 37.9°F (3.3°C) and an average high of 53.2°F (11.8°C). November brings a decrease in the average high-temperature, shifting from an enjoyable 66°F (18.9°C) in October to a fresh 53.2°F (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 42.1°F (5.6°C) and min 30°F (-1.1°C). Observing a mild shift, the average high-temperature during December reduces from November's fresh 53.2°F (11.8°C) to an icy 42.1°F (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
In Saint Charles, the average lowest temperatures are observed in January, with a high of 37.2°F (2.9°C) and a low of 24.3°F (-4.3°C).
Throughout the year, there are 141.9 rainfall days, and 27.68" (703mm) of precipitation is accumulated.
January through March, November and December are months with snowfall in Saint Charles.
In Saint Charles, during the entire year, snow falls for 21.6 days and aggregates up to 6.73" (171mm) of snow.
January has the least sunshine of the year, with an average of 4.6h of sunshine.
The months with the lowest UV index are January, February and December, with an average maximum UV index of 2.
The month with the least rainfall is February, when the rain falls for 7.3 days and typically collects 1.42" (36mm) of precipitation.
February is the month with the most snowfall. Snow falls for 6.2 days and accumulates 2.05" (52mm) of snow.
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.
In Saint Charles, Missouri, snow does not fall in April through October.
May is the most humid month in Saint Charles, Missouri, with an average relative humidity of 77%.
The month with the most rainfall in Saint Charles, Missouri, is May, when the rain falls for 16 days and typically aggregates up to 3.31" (84mm) of precipitation.
May through August, with an average maximum UV index of 6, are months with the highest UV index.
June has the longest days of the year, with an average of 14h and 48min of daylight.
July, with its high-temperature average of 86.7°F (30.4°C) and a low-temperature average of 68.9°F (20.5°C), is the warmest month in Saint Charles, Missouri.
The month with the most sunshine in Saint Charles is July, with an average of 10.6h of sunshine.
October is the least humid month, with an average relative humidity of 70%.
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 (86.7°F).
The month with the lowest average high temperature is January (37.2°F).
The month with the highest average low temperature is July (68.9°F).
The coldest month (with the lowest average low temperature) is January (24.3°F).
Average pressure
Saint Charles, 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:
29.94"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 Charles, MO
- Average wind speed in January:
9.3mph - Average wind speed in February:
9.1mph - Average wind speed in March:
8.9mph - Average wind speed in April:
8.9mph - Average wind speed in May:
7.3mph - Average wind speed in June:
6.5mph
- Average wind speed in July:
5.6mph - Average wind speed in August:
5.6mph - Average wind speed in September:
6.1mph - Average wind speed in October:
7.9mph - Average wind speed in November:
8.5mph - Average wind speed in December:
8.6mph
The windiest month (with the highest average wind speed) is January (9.3mph).
The calmest months (with the lowest average wind speed) are July and August (5.6mph).
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
- Average rainfall in January:
1.61" - Average rainfall in February:
1.42" - Average rainfall in March:
1.97" - Average rainfall in April:
3.19" - Average rainfall in May:
3.31" - Average rainfall in June:
3.03"
- Average rainfall in July:
2.87" - Average rainfall in August:
2.95" - Average rainfall in September:
1.73" - Average rainfall in October:
2.24" - Average rainfall in November:
1.61" - Average rainfall in December:
1.73"
The wettest month (with the highest rainfall) is May (3.31").
The driest month (with the least rainfall) is February (1.42").
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 (2.05").
The months with the least snowfall are April, May, June, July, August, September and October (0").
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 48min - Average daylight in February:
10h and 48min - Average daylight in March:
12h and 0min - Average daylight in April:
13h and 12min - Average daylight in May:
14h and 18min - Average daylight in June:
14h and 48min
- Average daylight in July:
14h and 36min - Average daylight in August:
13h and 36min - Average daylight in September:
12h and 24min - Average daylight in October:
11h and 12min - Average daylight in November:
10h and 6min - Average daylight in December:
9h and 30min
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 36min - Average sunshine in February:
4h and 42min - Average sunshine in March:
6h and 30min - Average sunshine in April:
8h and 36min - Average sunshine in May:
9h and 30min - Average sunshine in June:
10h and 30min
- Average sunshine in July:
10h and 36min - Average sunshine in August:
10h and 18min - Average sunshine in September:
9h and 36min - Average sunshine in October:
6h and 12min - Average sunshine in November:
5h and 30min - Average sunshine in December:
4h and 54min
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 (6mi).
The months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
