Peoria climate
Peoria (Illinois, United States) has a hot-summer humid continental climate (Köppen Dfa). The average temperature over the year is 11 °C52 °F, and about 983 mm39 in of precipitation falls in an average year.
Temperature by month
Precipitation by month
Peoria climate table
| Month | High °C°F | Low °C°F | Mean °C°F | Precip. mmin | Frost days |
|---|---|---|---|---|---|
| Jan | 133 | −818 | −425 | 522.1 | 29 |
| Feb | 337 | −720 | −228 | 512.0 | 26 |
| Mar | 1051 | −130 | 540 | 682.7 | 20 |
| Apr | 1864 | 541 | 1253 | 983.8 | 6 |
| May | 2374 | 1253 | 1763 | 1144.5 | 0 |
| Jun | 2882 | 1763 | 2373 | 1104.3 | 0 |
| Jul | 3086 | 1967 | 2576 | 1014.0 | 0 |
| Aug | 3085 | 1865 | 2475 | 923.6 | 0 |
| Sep | 2679 | 1457 | 2068 | 853.4 | 0 |
| Oct | 1865 | 643 | 1254 | 883.4 | 3 |
| Nov | 1051 | 032 | 542 | 642.5 | 16 |
| Dec | 338 | −523 | −130 | 612.4 | 27 |
| Year | 3086 | −818 | 1152 | 98339 | 127 |
“Year” row: highest monthly high, lowest monthly low, annual mean and annual total. Frost days are for the whole grid cell.
| Month | Humid. | Cloud | Solar | Daylight |
|---|---|---|---|---|
| Jan | 84% | 67% | 1.9 | 9:34 |
| Feb | 82% | 66% | 2.8 | 10:35 |
| Mar | 78% | 64% | 3.7 | 11:49 |
| Apr | 75% | 60% | 4.9 | 13:15 |
| May | 76% | 62% | 5.6 | 14:26 |
| Jun | 77% | 53% | 6.3 | 15:04 |
| Jul | 74% | 47% | 6.4 | 14:49 |
| Aug | 72% | 46% | 5.6 | 13:47 |
| Sep | 71% | 44% | 4.7 | 12:24 |
| Oct | 73% | 54% | 3.2 | 11:02 |
| Nov | 78% | 59% | 2.2 | 9:51 |
| Dec | 84% | 69% | 1.6 | 9:16 |
Humid. = average relative humidity at 2 m; cloud = average cloud amount; solar = average daily solar energy reaching the ground in kWh/m² (all-sky); daylight in hours:minutes, calculated for the 15th of each month.
What the climate of Peoria is like
The warmest month is July, with an average high of 30 °C86 °F and a low of 19 °C67 °F. The coldest is January, when highs average 1 °C33 °F and lows −8 °C18 °F. Seasons are strongly marked: the warmest month is on average 28.2 °C50.9 °F warmer than the coldest.
Annual precipitation is moderate at about 983 mm39 in. The wettest three-month stretch is May–July, which brings 33% of the annual total. The wettest month is May (114 mm4.5 in), the driest is February (51 mm2.0 in).
Relative humidity ranges from 71% in September to 84% in January. The clearest skies (lowest average cloud amount, 44%) are typical of September. Average wind speed near the ground ranges from 8 km/h (5 mph) in July to 14 km/h (9 mph) in April. Daylight lasts from about 9.3 hours in December to 15.1 hours in June.
A lasting snow cover is typical in December–February, when the average snow depth in the reanalysis exceeds 10 cm (deepest in January, about 15 cm).
Best time to visit Peoria
Based on these averages, the most comfortable months for sightseeing and outdoor activities are September: average highs of 26 °C79 °F to 26 °C79 °F with 85 mm3.4 in to 85 mm3.4 in of precipitation per month.
The most challenging month is January, which is cold, with average highs of 1 °C33 °F.
Comfort score: months are ranked by how close they come to an average high of 21–28 °C (70–82 °F), lows above 5 °C (41 °F), little precipitation and moderate humidity. The best-ranked months of each place are recommended, even where none meets all of these. These are general rules of thumb applied to long-term averages.
What to pack for Peoria
- Winter (December–February) — highs 133 to 3 °C38 °F, lows −818 to −5 °C23 °F, about 55 mm2.2 in of precipitation a month. Pack a winter coat, hat, gloves and warm, non-slip boots and shoes with good grip, as frost is common.
- Spring (March–May) — highs 1051 to 23 °C74 °F, lows −130 to 12 °C53 °F, about 93 mm3.7 in of precipitation a month. Pack long sleeves, a sweater and a medium jacket, an extra layer for the cooler mornings and evenings and an umbrella or light rain jacket.
- Summer (June–August) — highs 2882 to 30 °C86 °F, lows 1763 to 19 °C67 °F, about 101 mm4.0 in of precipitation a month. Pack light summer clothes such as T-shirts, shorts or light dresses and an umbrella or light rain jacket.
- Autumn (September–November) — highs 1051 to 26 °C79 °F, lows 032 to 14 °C57 °F, about 79 mm3.1 in of precipitation a month. Pack light layers — T-shirts plus a light sweater or jacket and an extra layer for the cooler mornings and evenings.
How Peoria compares
Compared with Joliet, about 156 km to the northeast, Peoria is on average 1.1 °C2 °F warmer and receives a similar amount of precipitation. The difference is largest in April (1.6 °C2.9 °F warmer).
Of the 222 places in the United States covered by World Climates, Peoria is the 170th warmest by annual mean temperature and the 108th wettest by annual precipitation. See all of them on the United States climate page.
Places in other countries with the most similar temperature and rainfall pattern: Satu Mare (Romania, Dfa), Piteşti (Romania, Dfa) and Sunzha (Ordzhonikidzevskaya) (Russia, Dfa).
The same NASA POWER grid cell also contains North Peoria (pop. 113,004). Their long-term averages in this dataset are essentially the same as for Peoria, so they do not have separate pages.
Nearby places
- Springfield 99 km · 12 °C53 °F · 1,001 mm39 in
- Davenport 124 km · 10 °C51 °F · 924 mm36 in
- Joliet 156 km · 10 °C51 °F · 985 mm39 in
- Aurora 159 km · 10 °C49 °F · 983 mm39 in
- Rockford 180 km · 9 °C48 °F · 967 mm38 in
- Elgin 185 km · 10 °C49 °F · 983 mm39 in
- Chicago 207 km · 10 °C50 °F · 982 mm39 in
- Cedar Rapids 225 km · 9 °C49 °F · 922 mm36 in
Frequently asked questions
What is the warmest month in Peoria?
July is the warmest month in Peoria, with an average high of 30 °C (86 °F) and an average low of 19 °C (67 °F).
What is the coldest month in Peoria?
January is the coldest month, with an average high of 1 °C (33 °F) and an average low of -8 °C (18 °F).
When does it rain the most in Peoria?
May is the wettest month with about 114 mm (4.5 in) of precipitation; February is the driest with about 51 mm (2.0 in).
What is the best time to visit Peoria?
Judging by long-term averages, the most comfortable months are September.
About this data
All figures are 25-year averages (January 2001 – December 2025) from the NASA POWER project. Temperature, humidity, wind and precipitation come from the MERRA-2 reanalysis (precipitation is the bias-corrected MERRA-2 product), cloud and solar values from CERES satellite data. They describe a grid cell of roughly 50–70 km, not a single weather station, so they can differ from airport records — most of all on coasts, in mountains and for rainfall. Average highs and lows are the monthly mean temperature plus/minus half of the average daily temperature range. Counts of rainy days are not part of this dataset.
The grid cell’s average elevation is 205 m, while Peoria lies at about 153 m. Temperatures on this page were therefore adjusted by +0.3 °C0.6 °F using the standard lapse rate of 6.5 °C per 1,000 m.