Climateby Month

Peoria, IL climate by month

NOAA 1991-2020 normals · 502 ft elevation

Summers in Peoria are warm and often humid; winters are cold and snowy. Highs peak at 86°F in July and fall to 34°F in January. Wet days are spread through the year, from about 8 to 13 a month. Normal snowfall is about 26 in a year. The most comfortable time to visit is May.

Warmest month
86°F
July normal high
Coldest month
18°F
January normal low
Wet days a year
117
37.5 in of precipitation
Snow a year
26.2 in
normal snowfall

How warm is Peoria?

Normal highs range from 34°F in January to 86°F in July.

0°20°40°60°80°100° January: normal high 34°F (1°C), low 18°F (-8°C) 34° 18° February: normal high 39°F (4°C), low 21°F (-6°C) March: normal high 51°F (11°C), low 32°F (0°C) April: normal high 64°F (18°C), low 42°F (6°C) May: normal high 74°F (23°C), low 53°F (12°C) June: normal high 83°F (28°C), low 62°F (17°C) July: normal high 86°F (30°C), low 66°F (19°C) 86° 66° August: normal high 85°F (29°C), low 64°F (18°C) September: normal high 78°F (26°C), low 56°F (13°C) October: normal high 65°F (18°C), low 44°F (7°C) November: normal high 51°F (11°C), low 33°F (1°C) December: normal high 39°F (4°C), low 23°F (-5°C) JFMAMJJASOND

Bars run from the normal low to the normal high for each month.

How rainy is Peoria?

May has the most wet days (about 13); the year brings about 38 in of precipitation.

January: 10 wet days February: 9 wet days March: 11 wet days April: 12 wet days May: 13 wet days 13 June: 11 wet days July: 9 wet days August: 8 wet days September: 8 wet days 8 October: 10 wet days November: 9 wet days December: 10 wet days JFMAMJJASOND

Wet day: at least 0.01 in of rain or melted snow, counted from daily records 1991-2020.

How much does it snow?

Normal snowfall is 26.2 in a year, most of it in January.

January: 7.7 in of snow 7.7 February: 6.9 in of snow March: 3.3 in of snow April: 0.5 in of snow May: 0.0 in of snow 0.0 June: 0.0 in of snow July: 0.0 in of snow August: 0.0 in of snow September: 0.0 in of snow October: 0.1 in of snow November: 1.5 in of snow December: 6.2 in of snow JFMAMJJASOND

How humid is Peoria?

Muggy days peak in July, at about 17 days.

January: 0 muggy days 0 February: 0 muggy days March: 0 muggy days April: 0 muggy days May: 3 muggy days June: 10 muggy days July: 17 muggy days 17 August: 15 muggy days September: 5 muggy days October: 1 muggy days November: 0 muggy days December: 0 muggy days JFMAMJJASOND

Muggy day: daily mean dew point of 65°F or higher, from hourly observations 1991-2020 at Greater Peoria Regional Airport, 5.3 mi WSW of the city center.

How much daylight?

Daylight ranges from about 9.3 hours in December to 15.0 hours in June.

January: 9.6 hours of daylight February: 10.7 hours of daylight March: 12.0 hours of daylight April: 13.3 hours of daylight May: 14.5 hours of daylight June: 15.0 hours of daylight 15.0 July: 14.8 hours of daylight August: 13.8 hours of daylight September: 12.5 hours of daylight October: 11.1 hours of daylight November: 9.9 hours of daylight December: 9.3 hours of daylight 9.3 JFMAMJJASOND
See all numbers
Monthly climate normals and day counts for Peoria, 1991-2020
MonthHighLowPrecip.Wet daysSnowMuggy daysDaylight
January 34°F18°F 2.1 in10 7.7 in 0 9.6 h
February 39°F21°F 2.0 in9 6.9 in 0 10.7 h
March 51°F32°F 2.7 in11 3.3 in 0 12.0 h
April 64°F42°F 4.0 in12 0.5 in 0 13.3 h
May 74°F53°F 4.7 in13 0.0 in 3 14.5 h
June 83°F62°F 3.7 in11 0.0 in 10 15.0 h
July 86°F66°F 3.5 in9 0.0 in 17 14.8 h
August 85°F64°F 3.3 in8 0.0 in 15 13.8 h
September 78°F56°F 3.5 in8 0.0 in 5 12.5 h
October 65°F44°F 3.2 in10 0.1 in 1 11.1 h
November 51°F33°F 2.7 in9 1.5 in 0 9.9 h
December 39°F23°F 2.2 in10 6.2 in 0 9.3 h

High and low: NOAA 1991-2020 normal daily high and low. Wet days: at least 0.01 in of rain or melted snow. Muggy days: daily mean dew point 65°F or higher.

Best months to visit Peoria

By our comfort score, the best month is May.

Comfort score by month (0-100) and its parts, in days per month
MonthScoreComfortableNotable rainHot or cold
Jan 280523
Feb 341518
Mar 49567
Apr 641181
May 691481
Jun 60775
Jul 53359
Aug 54566
Sep 651353
Oct 611260
Nov 43466
Dec 300519

Score = 40 × share of comfortable days + 25 × share of days without notable rain + 20 × share of days neither hot (90°F+) nor cold (high 40°F or below) + 15 × daylight. How the score works.

Frost dates in Peoria

The last spring frost typically comes around Apr 16, and the first fall frost around Oct 23, leaving 189 frost-free days in a typical year.

Frost and freeze dates for Peoria
Typical date1 year in 10
Last spring frost (32°F)Apr 16after May 4
First fall frost (32°F)Oct 23before Oct 9
Last hard freeze (28°F)Apr 5after Apr 21
First hard freeze (28°F)Nov 2before Oct 21
Frost-free season189 daysunder 167 days

"Typical" is the date with a 50% chance of a later spring frost (or earlier fall frost). Planting after the "1 year in 10" spring date gives a 90% chance of no further frost. The Old Farmer's Almanac publishes 30% dates, which fall between our typical and 1-in-10 dates.

Station: Peoria Gtr Peoria Airport (USW00014842), NOAA 1991-2020 freeze probabilities. Frost dates for every city in Illinois.

Hottest and coldest readings, 1991-2020

The highest reading was 104°F (July 23, 2012, and 2 other days); the lowest was -21°F (January 16, 2009, and 1 other day).

From the temperature station's daily records with NOAA quality flags removed. Not an all-time record.

Near Peoria

Similar climates elsewhere

Where the numbers come from

  • Temperature, rain, snowfall, snow depth, frost dates, humidity and wind by hour and cloud cover: Peoria Gtr Peoria Airport (USW00014842), 5.3 mi WSW of the city center, 650 ft (148 ft higher than the city). NOAA normals and daily records, 1991-2020.
  • Daily humidity and wind: Greater Peoria Regional Airport (725320-14842), 5.3 mi WSW of the city center, 655 ft (153 ft higher than the city). Hourly observations, 1991-2020.

Distances from the city center (USGS). Methodology · Report an error