December is one of the cooler months of the year in Peoria, with average highs near 18.9°C and lows around 5.7°C (mean 12.3°C). It is about average for rainfall, averaging 24 mm of rainfall and 44% relative humidity across the period.
December is one of the cooler months of the year in Peoria. Across 45 years of records, the warmest December in Peoria was 2025 — when the month averaged 16.7°C — while the coldest was 1987 at 9.6°C. Typical December days reach 18.9°C with nights near 5.7°C. The long-term trend is warming, about 0.6°C per decade.
December is about average for rainfall in Peoria, averaging 24 mm of rainfall. The wettest December on record was 1992 with 88 mm, while the driest were 1999 and 2024 at 0 mm.
Relative humidity in Peoria during December averages 44%. The most humid December was 1984 at 64%, and the least humid was 2017 at 23%.
December receives about 3.1 kWh/m²/day of solar energy in Peoria. The sunniest December was 1989 at 3.5 kWh/m²/day, and the cloudiest was 1984 at 2.7.
Average wind speed in Peoria during December is 2 m/s. The windiest December was 1982 at 2.4 m/s, while the calmest was 2022 at 1.5 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 11.7°C | 11.7°C | 11.7°C | 12.7°C | 14.5°C | +2.8°C |
| Avg High | 18.3°C | 18.5°C | 18.5°C | 19.0°C | 21.1°C | +2.8°C |
| Avg Low | 5.1°C | 4.9°C | 5.0°C | 6.4°C | 7.9°C | +2.8°C |
| Avg Rain | 31 mm | 27 mm | 18 mm | 23 mm | 20 mm | -11 mm |
December temperatures in Peoria have risen by about 2.7°C between 1981–1985 and 2021–2025.
December has ranged from a record low of -6°C (1990) to a record high of 29.5°C (2021).
Rainfall in December is about average for rainfall, averaging 24 mm, with a wettest year of 88 mm.
A quieter season to visit Peoria
If your dates are flexible, the more temperate months of April and October tend to be the most comfortable for visiting Peoria. That said, December — with days averaging 18.9°C and nights around 5.7°C (mean 12.3°C) and low rainfall (24 mm) — can still be rewarding for travellers who don't mind the cooler conditions, and often means fewer crowds.
| Year | Avg High | Avg Temp | Avg Low | Hottest Day | Coldest Day | Rainfall | Humidity | Wind | Solar |
|---|---|---|---|---|---|---|---|---|---|
| 2025 🔥 | 23.6°C | 16.7°C | 9.8°C | 27.4°C | 5.4°C | 3 mm | 43% | 1.8 m/s | — |
| 2024 | 23.7°C | 16.4°C | 9.2°C | 27.5°C | 4.9°C | 0 mm | 26% | 1.7 m/s | 3.3 |
| 2023 | 21.1°C | 14.5°C | 7.9°C | 27.1°C | 2.4°C | 21 mm | 39% | 1.8 m/s | 3.1 |
| 2022 | 18.1°C | 12.2°C | 6.4°C | 23.1°C | 0.0°C | 37 mm | 53% | 1.5 m/s | 2.9 |
| 2021 | 20.3°C | 14.3°C | 8.2°C | 29.5°C | 2.3°C | 48 mm | 45% | 1.8 m/s | 2.9 |
| 2020 | 19.7°C | 12.7°C | 5.8°C | 25.8°C | 1.6°C | 11 mm | 30% | 2.2 m/s | 3.3 |
| 2019 | 17.7°C | 12.1°C | 6.5°C | 23.3°C | -1.1°C | 34 mm | 55% | 2 m/s | 2.8 |
| 2018 | 18.6°C | 12.4°C | 6.2°C | 23.3°C | -0.1°C | 8 mm | 45% | 1.8 m/s | 3 |
| 2017 | 22.3°C | 15.3°C | 8.2°C | 29.2°C | 1.4°C | 2 mm | 23% | 2.1 m/s | 3.2 |
| 2016 | 19.9°C | 13.9°C | 7.8°C | 25.4°C | 1.2°C | 39 mm | 49% | 2 m/s | 2.9 |
| 2015 | 18.1°C | 11.4°C | 4.6°C | 26.2°C | -0.6°C | 6 mm | 39% | 2 m/s | 3.2 |
| 2014 | 18.9°C | 13.2°C | 7.4°C | 25.3°C | 0.1°C | 31 mm | 50% | 1.7 m/s | 2.8 |
| 2013 | 18.5°C | 11.6°C | 4.7°C | 26.2°C | -1.6°C | 10 mm | 44% | 2.1 m/s | 3.3 |
| 2012 | 18.8°C | 12.5°C | 6.2°C | 27.2°C | 0.1°C | 25 mm | 43% | 1.8 m/s | 3.2 |
| 2011 | 16.9°C | 10.4°C | 4.0°C | 24.6°C | -1.1°C | 34 mm | 49% | 2 m/s | 3 |
| 2010 | 20.7°C | 14.4°C | 8.1°C | 27.9°C | -2.9°C | 39 mm | 44% | 2 m/s | 2.9 |
| 2009 | 16.9°C | 10.7°C | 4.5°C | 22.4°C | -0.8°C | 21 mm | 43% | 2 m/s | 3 |
| 2008 | 17.5°C | 11.4°C | 5.3°C | 24.6°C | -1.4°C | 45 mm | 52% | 2.1 m/s | 2.9 |
| 2007 | 16.4°C | 9.9°C | 3.4°C | 24.1°C | -1.0°C | 31 mm | 49% | 2 m/s | 3.3 |
| 2006 | 19.0°C | 11.8°C | 4.6°C | 25.6°C | -0.5°C | 5 mm | 35% | 2 m/s | 3.2 |
| 2005 | 20.7°C | 13.6°C | 6.4°C | 25.9°C | 0.6°C | 0 mm | 26% | 1.8 m/s | 3.1 |
| 2004 | 18.6°C | 12.0°C | 5.4°C | 25.7°C | -0.5°C | 46 mm | 50% | 2.1 m/s | 3.1 |
| 2003 | 19.3°C | 12.5°C | 5.6°C | 25.6°C | -2.9°C | 8 mm | 38% | 2.1 m/s | 3.3 |
| 2002 | 18.1°C | 11.6°C | 5.1°C | 22.3°C | 0.6°C | 5 mm | 48% | 1.8 m/s | 3.2 |
| 2001 | 17.7°C | 10.7°C | 3.6°C | 24.0°C | -0.8°C | 16 mm | 43% | 1.9 m/s | 3.1 |
| 2000 | 20.3°C | 13.1°C | 6.0°C | 24.6°C | 1.9°C | 1 mm | 42% | 1.9 m/s | 3.3 |
| 1999 | 20.1°C | 12.7°C | 5.2°C | 25.1°C | 1.0°C | 0 mm | 25% | 2.3 m/s | 3.4 |
| 1998 | 18.7°C | 11.6°C | 4.4°C | 26.3°C | -3.4°C | 11 mm | 46% | 2.1 m/s | 3.2 |
| 1997 | 16.9°C | 10.5°C | 4.0°C | 22.2°C | -1.8°C | 39 mm | 50% | 2.2 m/s | 3.2 |
| 1996 | 20.5°C | 13.0°C | 5.6°C | 27.1°C | -1.7°C | 1 mm | 36% | 2 m/s | 3.2 |
| 1995 | 20.7°C | 13.6°C | 6.5°C | 26.3°C | 1.8°C | 0 mm | 36% | 1.9 m/s | 3.2 |
| 1994 | 17.8°C | 11.6°C | 5.5°C | 23.3°C | -0.7°C | 69 mm | 55% | 2 m/s | 2.9 |
| 1993 | 18.5°C | 11.3°C | 4.0°C | 23.4°C | -0.9°C | 2 mm | 43% | 2.2 m/s | 3.4 |
| 1992 🌧️ | 16.3°C | 10.1°C | 3.9°C | 20.5°C | -1.3°C | 88 mm | 58% | 2 m/s | 2.9 |
| 1991 | 18.0°C | 12.2°C | 6.5°C | 23.0°C | -2.2°C | 42 mm | 59% | 2.2 m/s | 3.1 |
| 1990 | 17.0°C | 10.1°C | 3.1°C | 24.3°C | -6.0°C | 19 mm | 43% | 2.3 m/s | 3.2 |
| 1989 | 20.1°C | 12.8°C | 5.6°C | 25.7°C | 0.1°C | 8 mm | 31% | 2.1 m/s | 3.5 |
| 1988 | 18.0°C | 11.1°C | 4.3°C | 24.2°C | -3.3°C | 3 mm | 42% | 2.3 m/s | 3.2 |
| 1987 ❄️ | 16.0°C | 9.6°C | 3.3°C | 24.6°C | -3.4°C | 37 mm | 51% | 1.8 m/s | 3.1 |
| 1986 | 18.2°C | 11.7°C | 5.3°C | 23.7°C | 0.5°C | 33 mm | 50% | 2 m/s | 3 |
| 1985 | 19.2°C | 12.1°C | 4.9°C | 23.8°C | -2.3°C | 23 mm | 49% | 2 m/s | 3.4 |
| 1984 | 17.1°C | 11.5°C | 5.9°C | 23.9°C | 0.8°C | 87 mm | 64% | 2.2 m/s | 2.7 |
| 1983 | 18.7°C | 12.2°C | 5.8°C | 22.6°C | 0.3°C | 37 mm | 56% | 2.1 m/s | — |
| 1982 | 16.7°C | 10.5°C | 4.3°C | 22.2°C | 0.3°C | 50 mm | 57% | 2.4 m/s | — |
| 1981 | 21.0°C | 14.0°C | 6.9°C | 26.9°C | 0.2°C | 3 mm | 43% | 1.9 m/s | — |
Actual recorded December data for each year, 1981–2025 — sourced from NASA POWER.
The average high in December is around 18.9°C with lows near 5.7°C (mean 12.3°C), based on 45 years of NASA POWER data.
December averages 24 mm of rainfall in Peoria, about average for rainfall. The wettest on record was 88 mm in 1992.
The hottest December reached 29.5°C in 2021. The coldest dipped to -6°C in 1990.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average December temperatures have risen by about 2.7°C. Daytime highs moved from 18.5°C to 21.4°C and overnight lows from 5.6°C to 8.3°C over the same span.
December is one of the cooler months of the year in Peoria and about average for rainfall, so plan for around 18.9°C daytime highs and 5.7°C at night.
Yes — December is the coldest month of the year in Peoria, averaging 12.3°C.
For December in Peoria, pack warm layers and a jacket for chilly mornings, with typical highs of 18.9°C and lows of 5.7°C.
Relative humidity in December averages 44% — relatively dry.
Average wind speed in December is 2 m/s. The windiest December on record averaged 2.4 m/s (1982).
The wettest December on record was 1992 with 88 mm. On average, December sees 24 mm.
All figures are derived from NASA POWER (Prediction Of Worldwide Energy Resources), based on MERRA-2 satellite reanalysis, covering 1981–2025.
Explore how the weather in Peoria behaves each December, based on 45 years of NASA POWER climate data from 1981 to 2025. This page breaks down average temperatures, rainfall, humidity, wind and solar radiation for December specifically, along with year-by-year records and how the month has changed over the decades.
