Climate and monthly weather forecastSaint Peter, IL
Climate and monthly weather forecast
Weather in January
January, like December, in Saint Peter, Illinois, is another cold winter month, with an average temperature fluctuating between 23.4°F (-4.8°C) and 36°F (2.2°C). With an average high-temperature of 36°F (2.2°C) and an average low-temperature of 23.4°F (-4.8°C), January is the coldest month. Weather in January »Weather in February
The last month of the winter, February, is also a wintry month in Saint Peter, Illinois, with temperature in the range of an average low of 27°F (-2.8°C) and an average high of 40.5°F (4.7°C). The average high-temperature in February, at a still wintry 40.5°F (4.7°C), reveals a modest deviation from January's 36°F (2.2°C). Weather in February »Weather in March
The first month of the spring, March, is a fresh month in Saint Peter, Illinois, with an average temperature fluctuating between 52.2°F (11.2°C) and 36.9°F (2.7°C). As February transitions into March, a change in temperatures is observed, with average highs moving from a cold 40.5°F (4.7°C) to a fresh 52.2°F (11.2°C). Weather in March »Weather in April
April in Saint Peter, Illinois, is a refreshing spring month, with an average temperature fluctuating between 46.6°F (8.1°C) and 63.5°F (17.5°C). April brings a rise in the average high-temperature, transitioning from March's fresh 52.2°F (11.2°C) to a comfortable 63.5°F (17.5°C). Weather in April »Weather in May
May, the last month of the spring in Saint Peter, is a moderately hot month, with an average temperature varying between 57°F (13.9°C) and 73.4°F (23°C). The arrival of May signals an increase in the average high-temperature, moving from an enjoyable 63.5°F (17.5°C) in April to a moderately hot 73.4°F (23°C). Weather in May »Weather in June
June, the first month of the summer in Saint Peter, is also a moderately hot month, with an average temperature ranging between min 65.5°F (18.6°C) and max 82.2°F (27.9°C). Saint Peter's transition into June brings a slight rise in the average high-temperature, moving from a warm 73.4°F (23°C) in May to a still moderately hot 82.2°F (27.9°C). Weather in June »Weather in July
July, like June, in Saint Peter, Illinois, is another warm summer month, with an average temperature varying between 83.7°F (28.7°C) and 67.1°F (19.5°C). July, with average temperatures reaching a high of 83.7°F (28.7°C) and a low of 67.1°F (19.5°C), is the warmest month. July's average heat index is computed to be a hot 93.2°F (34°C). Weather in July »Weather in August
The last month of the summer, August, is also a moderately hot month in Saint Peter, Illinois, with an average temperature varying between 65.1°F (18.4°C) and 82.4°F (28°C). August brings an average high-temperature of a still warm 82.4°F (28°C), nearly identical to the preceding month. Weather in August »Weather in September
September, the first month of the autumn in Saint Peter, is also a moderately hot month, with an average temperature fluctuating between 59.4°F (15.2°C) and 77.9°F (25.5°C). September records an average high-temperature of a still warm 77.9°F (25.5°C), indicating a minor variation from the preceding month. Weather in September »Weather in October
October, like September, in Saint Peter, Illinois, is another refreshing autumn month, with an average temperature varying between 48.4°F (9.1°C) and 65.1°F (18.4°C). The average high-temperature drops in October, from September's warm 77.9°F (25.5°C) to a refreshing 65.1°F (18.4°C). Weather in October »Weather in November
The last month of the autumn, November, is also a fresh month in Saint Peter, Illinois, with an average temperature ranging between min 37.2°F (2.9°C) and max 51.4°F (10.8°C). A shift in Saint Peter's weather is observed as October turns into November, with the average high temperature reducing from a refreshing 65.1°F (18.4°C) to a cool 51.4°F (10.8°C). Weather in November »Weather in December
December, the first month of the winter in Saint Peter, is also a wintry month, with temperature in the range of an average high of 40.6°F (4.8°C) and an average low of 29.5°F (-1.4°C). December shows a mild decline in the average high-temperature, falling from November's fresh 51.4°F (10.8°C) to an icy 40.6°F (4.8°C). Weather in December »Updated: Feb 12, 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
With average high and low temperatures of 36°F (2.2°C) and 23.4°F (-4.8°C) respectively, January is Saint Peter's coldest month.
In Saint Peter, Illinois, during the entire year, the rain falls for 139.3 days and collects up to 23.94" (608mm) of precipitation.
January through April, November and December are months with snowfall.
In Saint Peter, Illinois, during the entire year, snow falls for 18.9 days and aggregates up to 5.24" (133mm) of snow.
The month with the least sunshine is January, with an average of 4.3h of sunshine.
January, February, November and December, with an average maximum UV index of 2, are months with the lowest UV index in Saint Peter, Illinois.
The month with the least rainfall in Saint Peter, Illinois, is February, when the rain falls for 7.8 days and typically collects 1.18" (30mm) of precipitation.
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.
The wettest months in Saint Peter are April and June, with an average 2.95" (75mm) of rainfall.
May through October are months without snowfall.
With an average of 14h and 48min of daylight, June has the longest days of the year.
With an average of 10.4h of sunshine, June has the most sunshine of the year in Saint Peter.
The months with the highest UV index in Saint Peter, Illinois, are June through August, with an average maximum UV index of 6.
In Saint Peter, July registers the highest temperatures, averaging 83.7°F (28.7°C) at the peak and 67.1°F (19.5°C) at the lowest.
The months with the highest humidity in Saint Peter are July and August, with an average relative humidity of 81%.
October is the least humid month in Saint Peter, with an average relative humidity of 71%.
December is the month with the most snowfall. Snow falls for 3.5 days and accumulates 1.65" (42mm) of snow.
December has the shortest days of the year, with an average of 9h and 30min of daylight.
Average temperature
Saint Peter, IL
The warmest month (with the highest average high temperature) is July (83.7°F).
The month with the lowest average high temperature is January (36°F).
The month with the highest average low temperature is July (67.1°F).
The coldest month (with the lowest average low temperature) is January (23.4°F).
Average pressure
Saint Peter, IL
- Average pressure in January:
30.16"Hg - Average pressure in February:
30.12"Hg - Average pressure in March:
30.08"Hg - Average pressure in April:
29.95"Hg - Average pressure in May:
29.96"Hg - Average pressure in June:
29.93"Hg
- Average pressure in July:
29.97"Hg - Average pressure in August:
29.98"Hg - Average pressure in September:
30.03"Hg - Average pressure in October:
30.03"Hg - Average pressure in November:
30.13"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 (29.93"Hg).
Average wind speed
Saint Peter, IL
- Average wind speed in January:
10.3mph - Average wind speed in February:
10.2mph - Average wind speed in March:
10mph - Average wind speed in April:
9.9mph - Average wind speed in May:
8.2mph - Average wind speed in June:
7.1mph
- Average wind speed in July:
6mph - Average wind speed in August:
6mph - Average wind speed in September:
6.6mph - Average wind speed in October:
8.7mph - Average wind speed in November:
9.3mph - Average wind speed in December:
9.4mph
The windiest month (with the highest average wind speed) is January (10.3mph).
The calmest months (with the lowest average wind speed) are July and August (6mph).
Average humidity
Saint Peter, IL
The months with the highest relative humidity are July and August (81%).
The month with the lowest relative humidity is October (71%).
Average rainfall
Saint Peter, IL
- Average rainfall in January:
1.61" - Average rainfall in February:
1.18" - Average rainfall in March:
1.93" - Average rainfall in April:
2.95" - Average rainfall in May:
2.56" - Average rainfall in June:
2.95"
The wettest months (with the highest rainfall) are April and June (2.95").
The driest month (with the least rainfall) is February (1.18").
Average rainfall days
Saint Peter, IL
- Average rainfall days in January:
7.3 days - Average rainfall days in February:
7.8 days - Average rainfall days in March:
12.8 days - Average rainfall days in April:
14.2 days - Average rainfall days in May:
15.7 days - Average rainfall days in June:
14.1 days
- Average rainfall days in July:
16 days - Average rainfall days in August:
12.8 days - Average rainfall days in September:
11.5 days - Average rainfall days in October:
9.7 days - Average rainfall days in November:
8.5 days - Average rainfall days in December:
8.9 days
The month with the highest number of rainy days is July (16 days).
The month with the least rainy days is January (7.3 days).
Average snowfall
Saint Peter, IL
The month with the highest snowfall is December (1.65").
The months with the least snowfall are May, June, July, August, September and October (0").
Average snowfall days
Saint Peter, IL
- Average snowfall days in January:
5.7 days - Average snowfall days in February:
5.6 days - Average snowfall days in March:
2.6 days - Average snowfall days in April:
0.3 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:
1.1 days - Average snowfall days in December:
3.5 days
The month with the highest number of snowfall days is January (5.7 days).
The months with the least snowfall days are May, June, July, August and September (0 days).
Average daylight / Average sunshine
Saint Peter, IL
- 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 18min - Average sunshine in February:
4h and 30min - Average sunshine in March:
6h and 18min - Average sunshine in April:
8h and 12min - Average sunshine in May:
9h and 0min - Average sunshine in June:
10h and 24min
- Average sunshine in July:
10h and 12min - Average sunshine in August:
9h and 54min - Average sunshine in September:
9h and 12min - Average sunshine in October:
6h and 18min - Average sunshine in November:
5h and 24min - Average sunshine in December:
4h and 36min
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 18min).
Average sunshine days
Saint Peter, IL
- Average sunshine days in January:
19.5 days - Average sunshine days in February:
15.1 days - Average sunshine days in March:
15.3 days - Average sunshine days in April:
13.8 days - Average sunshine days in May:
12.3 days - Average sunshine days in June:
12.9 days
- Average sunshine days in July:
12.3 days - Average sunshine days in August:
14.4 days - Average sunshine days in September:
16.4 days - Average sunshine days in October:
19.4 days - Average sunshine days in November:
19.5 days - Average sunshine days in December:
19.2 days
The months with the most sunshine days are January and November (19.5 days).
The months with the least sunshine days are May and July (12.3 days).
Average UV index
Saint Peter, IL
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
Saint Peter, IL
The month with the most cloud cover is January (Cloud cover 53).
The months with the least cloud cover are June and July (Cloud cover 29).
Average visibility
Saint Peter, IL
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).
