The best times to visit Princeton for ideal weather are

April 30th to October 21st

based on average temperature and humidity from NOAA (the National Oceanic and Atmospheric Administration). Read below for more weather and travel details.

 

 


Other Princeton Travel Info

Weather in Princeton

Temperature

Average temperatures in Princeton vary drastically. Considering humidity, temperatures feel cold for about half of the year and otherwise nice with a low chance of precipitation most of the year. The area is somewhat temperate — in the 40th percentile for pleasant weather — compared to tourist destinations worldwide. Weeks with ideal weather are listed above. If you’re looking for the very warmest time to visit Princeton, the hottest months are July, August, and then June. See average monthly temperatures below. The warmest time of year is generally mid July where highs are regularly around 86.9°F (30.5°C) with temperatures rarely dropping below 67.3°F (19.6°C) at night.

Princeton Temperatures (Fahrenheit)

Key
High
Average
Low

Princeton Temperatures (Celsius)

Key
High
Average
Low

“Feels-Like” Temperatures

The way we experience weather isn’t all about temperature. Higher temperatures affect us much more at higher humidity, and colder temperatures feel piercing with high winds. Our perceived temperatures factor in humidity and wind chill to better represent how hot or cold the day feels to a person.

Princeton Perceived Temperature (F)

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High
Average
Low

Princeton Perceived Temperature (C)

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High
Average
Low

 

Average Princeton Temperatures by Month

Daily highs (averaged for the month) usually give the best indication of the weather. A significantly lower mean and low generally just means it gets colder at night.

Show Fahrenheit

Month Avg. High (°F) Avg. Mean (°F) Avg. Low (°F)
Jan 32.9 24.1 16.7
Feb 33.3 24.7 17.4
Mar 50.7 40 31.9
Apr 64 51.7 41.3
May 76 63.8 53.2
Jun 82.8 71.9 61.9
Jul 85.5 75.1 65.1
Aug 83.9 73.3 63.4
Sep 78.3 65.9 55.4
Oct 65.8 54.4 44.6
Nov 51.6 41.7 33.2
Dec 37.9 30.2 23.1

Show Celsius

Month Avg. High (°C) Avg. Mean (°C) Avg. Low (°C)
Jan 0.5 -4.4 -8.5
Feb 0.7 -4.1 -8.1
Mar 10.4 4.4 -0.1
Apr 17.8 10.9 5.2
May 24.4 17.7 11.8
Jun 28.2 22.2 16.6
Jul 29.7 23.9 18.4
Aug 28.8 22.9 17.4
Sep 25.7 18.8 13
Oct 18.8 12.4 7
Nov 10.9 5.4 0.7
Dec 3.3 -1 -4.9

 


 

Precipitation (Rain or Snow)

If dry weather is what you’re after, the months with the lowest chance of significant precipitation in Princeton are February, January, and then March. Note that we define “significant precipitation” as .1 inches or more in this section. The lowest chance of rain or snow occurs around mid July. For example, on the week of July 16th there are no days of precipitation on average. By contrast, it’s most likely to rain or snow in mid June with an average of 3 days of significant precipitation the week of June 18th.

When can you find snow in Princeton? Weather stations report no annual snow. Please note that a value of 0 for snow in the graph below may either mean there was no snow, or that snow is unreported.

Chance of Precipitation

The graph below shows the % chance of rainy and snowy days in Princeton.

Key
Days with precipitation

Snow on the Ground

The graph below shows the average snow on the ground in Princeton (in).

Key
Snow depth

Average Rain and Snow by Month

Show Inches

Month Daily Chance of Rain Average Snow Depth (in) Total Precipitation (in)
Jan 9% 0 1.3
Feb 9% 0 1.1
Mar 10% 0 1
Apr 18% 0 2.5
May 23% 0 3.6
Jun 25% 0 3.6
Jul 10% 0 1.3
Aug 12% 0 2
Sep 14% 0 1.9
Oct 15% 0 2.1
Nov 10% 0 1.3
Dec 14% 0 1.9

Show Centimeters

Month Daily Chance of Rain Average Snow Depth (cm) Total Precipitation (cm)
Jan 9 0 3.3
Feb 9 0 2.8
Mar 10 0 2.5
Apr 18 0 6.4
May 23 0 9.1
Jun 25 0 9.1
Jul 10 0 3.3
Aug 12 0 5.1
Sep 14 0 4.8
Oct 15 0 5.3
Nov 10 0 3.3
Dec 14 0 4.8

 

Humidity and Wind

Princeton has some very humid months, with other comfortably humid months. The least humid month is April (52.1% relative humidity), and the most humid month is December (75.7%).

Wind in Princeton is usually moderate. The windiest month is April, followed by February and January. April’s average wind speed of around 10.2 knots (11.7 MPH or 18.9 KPH) is considered “a gentle breeze.” Maximum sustained winds (the highest speed for the day lasting more than a few moments) are at their highest in late April where average top sustained speeds reach 19.5 knots, which is considered a fresh breeze.

Relative Humidity (%)

The graph below shows the average % humidity by month in Princeton.

Key
Avg. Relative Humidity

Wind

The graph below shows wind speed (max and average) in knots.

Key
Max Sustained Wind
Average Daily Wind

Average Wind Speeds

Show Wind Speeds

All wind speeds are in knots. 1 knot = 1.15 MPH or 1.85 KPH.

Month Avg. Wind Avg. Wind Feel Sustained High Wind High Wind Feel
Jan 9.5 Gentle breeze 17 Strong breeze
Feb 9.6 Gentle breeze 16.9 Significant breeze
Mar 9.4 Gentle breeze 17 Strong breeze
Apr 10.2 Gentle breeze 19.3 Strong breeze
May 8.6 Gentle breeze 17.5 Strong breeze
Jun 7.3 Gentle breeze 15.8 Significant breeze
Jul 5.8 Light breeze 12.8 Strong breeze
Aug 5.3 Light breeze 11.8 Significant breeze
Sep 6.4 Light breeze 13.3 Strong breeze
Oct 8.2 Gentle breeze 15.6 Significant breeze
Nov 9.2 Gentle breeze 16.7 Strong breeze
Dec 8.8 Gentle breeze 16 Significant breeze

Show Relative Humidity by Month

Month Avg. Relative Humidity
Jan 69.2%
Feb 68.2%
Mar 61.6%
Apr 52.1%
May 52.7%
Jun 59.7%
Jul 61.6%
Aug 64.1%
Sep 60.2%
Oct 58.1%
Nov 62.7%
Dec 75.7%

 

Is it Safe to Travel to Princeton?

Our best data indicates this area is generally safe. As of Oct 07, 2019 there are no travel advisories or warnings for the United States; exercise normal security precautions. Check this page for any recent changes or regions to avoid: Travel Advice and Advisories. This advisory was last updated on Sep 23, 2019.


 

The Busiest and Least Crowded Months

The busiest month for tourism in Princeton, IL, US is July, followed by June and August. Prices for hotels and flights will be most expensive during these months, though you can save if you purchase well in advance. Tourists are unlikely to visit Princeton in November. Those willing to visit at these times will likely find it the least expensive month.

Estimated Tourism by Month

 

Most Popular Months to Visit

Key
Tourists Seeking Accommodations

Tourism graph is based on Google searches for services used by tourists relative to the rest of the year. Tourism data for this area is extrapolated based on nearby areas. Displayed data is calculated relative to the peak, so a score of 38.7 in November means 38.7% of the tourists vs. July.

 

 

Overall Princeton Travel Experience by Season

Spring (March through May)

Humidity and temperatures combine to make this season feel moderately cold. Highs range from 80.1°F (26.7°C) and 36.9°F (2.7°C) with far warmer temperatures in the later months. Rain is somewhat common with 3 to 7 days of significant precipitation per month. Spring is the second busiest for tourism, which makes it a good time for those looking for things to do.

Summer (June through August)

The middle-year months have very comfortable weather with high temperatures that are comfortable. These months see moderate precipitation with 3 to 8 days of precipitation per month. June – August is the busiest season for tourism in Princeton, so lodging and other accommodations may cost more than usual.

Fall (September through November)

Fall daily highs range from 81.4°F (27.4°C) and 43.8°F (6.6°C), which will feel chilly given the humidity and wind. It rains or snows a significant amount: 3 to 5 days per month. Tourism is the slowest during these months due to the weather, so hotels may be affordably priced.

Winter (December through February)

Weather is far too cold this time of year in Princeton to be enjoyable for warm weather travelers. The average high during this season is between 37.9°F (3.3°C) and 30.8°F (-0.7°C). On average, it rains or snows a smalll amount: 3 to 4 times per month. These times of year are fairly slow with tourists.

 

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