Climate and monthly weather forecastPrinceton, IL
Climate and monthly weather forecast
Weather in January
January, like December, is another subzero cold winter month in Princeton, Illinois, with an average temperature varying between 16.5°F (-8.6°C) and 28.8°F (-1.8°C). January is the month that records the lowest temperatures, with averages ranging from a high of 28.8°F (-1.8°C) to a low of 16.5°F (-8.6°C). Weather in January »Weather in February
February, the last month of the winter in Princeton, is an icy month, with an average temperature varying between 19.8°F (-6.8°C) and 32.7°F (0.4°C). The advent of February brings an average high-temperature of a cold 32.7°F (0.4°C), almost identical to the preceding month. Weather in February »Weather in March
The first month of the spring, March, is a chilly month in Princeton, Illinois, with an average temperature fluctuating between 46.8°F (8.2°C) and 32°F (0°C). Entering March, Princeton sees a temperature rise, with the average high-temperature advancing from February's wintry 32.7°F (0.4°C) to a chilly 46.8°F (8.2°C). Weather in March »Weather in April
April is a mild spring month in Princeton, Illinois, with an average temperature ranging between max 58.6°F (14.8°C) and min 42.4°F (5.8°C). As April sets, the average high-temperature shows an increase, moving up from a chilly 46.8°F (8.2°C) in March to a refreshing 58.6°F (14.8°C). Weather in April »Weather in May
The last month of the spring, May, is a pleasant month in Princeton, Illinois, with an average temperature varying between 53.4°F (11.9°C) and 70.3°F (21.3°C). As May sets, the average high-temperature shows an increase, moving up from a mild 58.6°F (14.8°C) in April to an agreeable 70.3°F (21.3°C). Weather in May »Weather in June
June, the first month of the summer in Princeton, is a moderately hot month, with an average temperature varying between 61.5°F (16.4°C) and 78.6°F (25.9°C). As May gives way to June, the average high-temperature displays a slight ascent, adjusting from a pleasant 70.3°F (21.3°C) to a warm 78.6°F (25.9°C). Weather in June »Weather in July
July, like June, in Princeton, Illinois, is another warm summer month, with an average temperature ranging between max 80.6°F (27°C) and min 64.2°F (17.9°C). July stands out as Princeton's warmest month, with an average high-temperature of 80.6°F (27°C) and a low-temperature of 64.2°F (17.9°C). July's average heat index is estimated at a tropical 86°F (30°C). Weather in July »Weather in August
The last month of the summer, August, is also a moderately hot month in Princeton, Illinois, with an average temperature fluctuating between 62.1°F (16.7°C) and 79.5°F (26.4°C). Princeton sees the arrival of August with an average high-temperature of a still warm 79.5°F (26.4°C), indicating a subtle variation from July. Weather in August »Weather in September
September, the first month of the autumn in Princeton, is also a moderately hot month, with an average temperature ranging between max 74.7°F (23.7°C) and min 56.1°F (13.4°C). The onset of September brings an average high-temperature of a still warm 74.7°F (23.7°C), nearly matching the August temperature. Weather in September »Weather in October
October, like September, in Princeton, Illinois, is another comfortable autumn month, with an average temperature ranging between min 45.3°F (7.4°C) and max 61.2°F (16.2°C). In Princeton, the average high-temperature in October drops from a warm 74.7°F (23.7°C) in September to a comfortable 61.2°F (16.2°C). Weather in October »Weather in November
The last month of the autumn, November, is also a frosty month in Princeton, Illinois, with an average temperature ranging between max 46.4°F (8°C) and min 33.6°F (0.9°C). November's arrival signals a significant decrease in average high-temperatures, falling from October's enjoyable 61.2°F (16.2°C) to a chilly 46.4°F (8°C). Weather in November »Weather in December
The first month of the winter, December, is still a cold month in Princeton, Illinois, with an average temperature fluctuating between 24.1°F (-4.4°C) and 34.5°F (1.4°C). Princeton in December experiences a subtle temperature decline, with average high-temperatures reducing from a chilly 46.4°F (8°C) in November to a wintry 34.5°F (1.4°C). Weather in December »Updated: Aug 9, 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
Princeton's coldest month, January, generally records average temperatures ranging from a high of 28.8°F (-1.8°C) to a low of 16.5°F (-8.6°C).
January is the month with the least rainfall. Rain falls for 4.8 days and accumulates 0.75" (19mm) of precipitation.
In Princeton, during the entire year, the rain falls for 130 days and collects up to 17.64" (448mm) of precipitation.
January through April, October through December are months with snowfall.
January is the month with the most snowfall. Snow falls for 10.4 days and accumulates 2.09" (53mm) of snow.
Throughout the year, there are 33.4 snowfall days, and 7.05" (179mm) of snow is accumulated.
January has the least sunshine of the year in Princeton, with an average of 3.8h of sunshine.
January and December, with an average maximum UV index of 1, are months with the lowest UV index.
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.
May is the month with the most rainfall. Rain falls for 17 days and accumulates 2.91" (74mm) of precipitation.
In Princeton, snow does not fall in May through September.
June has the longest days of the year, with an average of 15h and 6min of daylight.
June and July, with an average of 9.7h of sunshine, are months with the most sunshine.
With its average high temperature of 80.6°F (27°C) and a low of 64.2°F (17.9°C), July is regarded as the warmest month.
The most humid month is July, with an average relative humidity of 85%.
July is the month with the highest UV index, with an average maximum UV index of 6.
With an average relative humidity of 72%, October is the least humid month.
With an average of 9h and 12min of daylight, December has the shortest days of the year.
Average temperature
Princeton, IL
The warmest month (with the highest average high temperature) is July (80.6°F).
The month with the lowest average high temperature is January (28.8°F).
The month with the highest average low temperature is July (64.2°F).
The coldest month (with the lowest average low temperature) is January (16.5°F).
Average pressure
Princeton, IL
- Average pressure in January:
30.13"Hg - Average pressure in February:
30.11"Hg - Average pressure in March:
30.08"Hg - Average pressure in April:
29.94"Hg - Average pressure in May:
29.95"Hg - Average pressure in June:
29.91"Hg
- Average pressure in July:
29.97"Hg - Average pressure in August:
29.97"Hg - Average pressure in September:
30.03"Hg - Average pressure in October:
30.01"Hg - Average pressure in November:
30.1"Hg - Average pressure in December:
30.1"Hg
The month with the highest atmospheric pressure is January (30.13"Hg).
The month with the lowest atmospheric pressure is June (29.91"Hg).
Average wind speed
Princeton, IL
- Average wind speed in January:
10.3mph - Average wind speed in February:
10.3mph - Average wind speed in March:
10.1mph - Average wind speed in April:
10.5mph - Average wind speed in May:
8.9mph - Average wind speed in June:
7.7mph
- Average wind speed in July:
6.6mph - Average wind speed in August:
6.4mph - Average wind speed in September:
7.6mph - Average wind speed in October:
9.2mph - Average wind speed in November:
9.9mph - Average wind speed in December:
9.6mph
The windiest month (with the highest average wind speed) is April (10.5mph).
The calmest month (with the lowest average wind speed) is August (6.4mph).
Average humidity
Princeton, IL
The month with the highest relative humidity is July (85%).
The month with the lowest relative humidity is October (72%).
Average rainfall
Princeton, IL
- Average rainfall in January:
0.75" - Average rainfall in February:
0.83" - Average rainfall in March:
1.1" - Average rainfall in April:
2.09" - Average rainfall in May:
2.91" - Average rainfall in June:
1.89"
- Average rainfall in July:
1.77" - Average rainfall in August:
1.5" - Average rainfall in September:
1.22" - Average rainfall in October:
1.65" - Average rainfall in November:
1.02" - Average rainfall in December:
0.91"
The wettest month (with the highest rainfall) is May (2.91").
The driest month (with the least rainfall) is January (0.75").
Average rainfall days
Princeton, IL
- Average rainfall days in January:
4.8 days - Average rainfall days in February:
4.5 days - Average rainfall days in March:
10.6 days - Average rainfall days in April:
14.7 days - Average rainfall days in May:
17 days - Average rainfall days in June:
15.8 days
- Average rainfall days in July:
14.3 days - Average rainfall days in August:
12.8 days - Average rainfall days in September:
10.5 days - Average rainfall days in October:
10.7 days - Average rainfall days in November:
8.1 days - Average rainfall days in December:
6.2 days
The month with the highest number of rainy days is May (17 days).
The month with the least rainy days is February (4.5 days).
Average snowfall
Princeton, IL
The month with the highest snowfall is January (2.09").
The months with the least snowfall are May, June, July, August and September (0").
Average snowfall days
Princeton, IL
- Average snowfall days in January:
10.4 days - Average snowfall days in February:
8.5 days - Average snowfall days in March:
3.6 days - Average snowfall days in April:
0.8 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:
0.4 days - Average snowfall days in November:
2.5 days - Average snowfall days in December:
7.1 days
The month with the highest number of snowfall days is January (10.4 days).
The months with the least snowfall days are May, June, July and August (0 days).
Average daylight / Average sunshine
Princeton, IL
- Average daylight in January:
9h and 36min - Average daylight in February:
10h and 36min - Average daylight in March:
12h and 0min - Average daylight in April:
13h and 24min - Average daylight in May:
14h and 30min - Average daylight in June:
15h and 6min
- Average daylight in July:
14h and 48min - Average daylight in August:
13h and 48min - Average daylight in September:
12h and 30min - Average daylight in October:
11h and 6min - Average daylight in November:
9h and 54min - Average daylight in December:
9h and 12min
The month with the longest days is June (Average daylight: 15h and 6min).
The month with the shortest days is December (Average daylight: 9h and 12min).
- Average sunshine in January:
3h and 48min - Average sunshine in February:
4h and 0min - Average sunshine in March:
6h and 24min - Average sunshine in April:
7h and 48min - Average sunshine in May:
8h and 36min - Average sunshine in June:
9h and 42min
- Average sunshine in July:
9h and 42min - Average sunshine in August:
9h and 36min - Average sunshine in September:
8h and 54min - Average sunshine in October:
5h and 42min - Average sunshine in November:
5h and 12min - Average sunshine in December:
4h and 12min
The months with the most sunshine are June and July (Average sunshine: 9h and 42min).
The month with the least sunshine is January (Average sunshine: 3h and 48min).
Average sunshine days
Princeton, IL
- Average sunshine days in January:
17.8 days - Average sunshine days in February:
15.6 days - Average sunshine days in March:
17 days - Average sunshine days in April:
13.4 days - Average sunshine days in May:
11.9 days - Average sunshine days in June:
11.8 days
- Average sunshine days in July:
12.9 days - Average sunshine days in August:
15.4 days - Average sunshine days in September:
17.6 days - Average sunshine days in October:
18.1 days - Average sunshine days in November:
19.5 days - Average sunshine days in December:
17.5 days
The month with the most sunshine days is November (19.5 days).
The month with the least sunshine days is June (11.8 days).
Average UV index
Princeton, IL
The month with the highest UV index is July (UV index 6).
The months with the lowest UV index are January and December (UV index 1).
Average cloud cover
Princeton, IL
The month with the most cloud cover is January (Cloud cover 60).
The month with the least cloud cover is September (Cloud cover 32).
Average visibility
Princeton, IL
The months with the highest visibility are January, February, March, April, May, June, September, October, November and December (6mi).
The months with the lowest visibility are July and August (5mi).
