Hot-summer humid continental climate
Climate Walnut - Illinois
Annual high59ºF
Annual low39ºF
Precipitation35.81 inch
| Month | HighºF | LowºF | Precipinch | Snowinch |
|---|---|---|---|---|
| Jan | 29 | 12 | 1.29 | 10 |
| Feb | 34 | 17 | 1.57 | 8 |
| Mar | 47 | 28 | 2.15 | 3 |
| Apr | 61 | 38 | 3.18 | 1 |
| May | 71 | 50 | 4.36 | 0 |
| Jun | 81 | 59 | 4.56 | 0 |
| Jul | 84 | 63 | 3.85 | 0 |
| Aug | 82 | 61 | 4.44 | 0 |
| Sep | 75 | 52 | 3.12 | 0 |
| Oct | 63 | 40 | 2.89 | 0 |
| Nov | 48 | 30 | 2.44 | 1 |
| Dec | 33 | 17 | 1.96 | 9 |
- JanHigh 29ºFLow 12ºFPrecip 1.29 inch
- FebHigh 34ºFLow 17ºFPrecip 1.57 inch
- MarHigh 47ºFLow 28ºFPrecip 2.15 inch
- AprHigh 61ºFLow 38ºFPrecip 3.18 inch
- MayHigh 71ºFLow 50ºFPrecip 4.36 inch
- JunHigh 81ºFLow 59ºFPrecip 4.56 inch
- JulHigh 84ºFLow 63ºFPrecip 3.85 inch
- AugHigh 82ºFLow 61ºFPrecip 4.44 inch
- SepHigh 75ºFLow 52ºFPrecip 3.12 inch
- OctHigh 63ºFLow 40ºFPrecip 2.89 inch
- NovHigh 48ºFLow 30ºFPrecip 2.44 inch
- DecHigh 33ºFLow 17ºFPrecip 1.96 inch
Climate summary
What is the average weather in Walnut, Illinois?
Walnut experiences a humid continental climate, marked by very large seasonal temperature contrasts. Summers are warm and fairly wet, with the most precipitation arriving in June. Winters are cold and snowy, bringing significant snowfall, while January is the driest month overall.
Walnut weather averages
Annual high59ºF
Annual low39ºF
Precipitation35.81 inch
Snowfall32 inch
Daily normals Walnut - Illinois - January
| Day | HighºF | LowºF | Prec/ | Prec/ | Snow/ | Snow/ |
|---|---|---|---|---|---|---|
| Jan 1 | 30.7 | 14.9 | 0.05 | 0.05 | 0.40 | 0.40 |
| Jan 2 | 30.5 | 14.7 | 0.10 | 0.10 | 0.80 | 0.80 |
| Jan 3 | 30.3 | 14.5 | 0.15 | 0.15 | 1.20 | 1.20 |
| Jan 4 | 30.1 | 14.3 | 0.20 | 0.20 | 1.60 | 1.60 |
| Jan 5 | 30.0 | 14.1 | 0.25 | 0.25 | 2.00 | 2.00 |
| Jan 6 | 29.8 | 13.9 | 0.31 | 0.31 | 2.40 | 2.40 |
| Jan 7 | 29.7 | 13.7 | 0.36 | 0.36 | 2.80 | 2.80 |
| Jan 8 | 29.5 | 13.5 | 0.41 | 0.41 | 3.30 | 3.30 |
| Jan 9 | 29.4 | 13.3 | 0.46 | 0.46 | 3.70 | 3.70 |
| Jan 10 | 29.3 | 13.2 | 0.51 | 0.51 | 4.20 | 4.20 |
| Jan 11 | 29.2 | 13.0 | 0.57 | 0.57 | 4.60 | 4.60 |
| Jan 12 | 29.1 | 12.9 | 0.62 | 0.62 | 5.10 | 5.10 |
| Jan 13 | 29.0 | 12.7 | 0.67 | 0.67 | 5.50 | 5.50 |
| Jan 14 | 28.9 | 12.6 | 0.72 | 0.72 | 6.00 | 6.00 |
| Jan 15 | 28.9 | 12.5 | 0.77 | 0.77 | 6.40 | 6.40 |
| Jan 16 | 28.8 | 12.4 | 0.82 | 0.82 | 6.80 | 6.80 |
| Jan 17 | 28.8 | 12.3 | 0.87 | 0.87 | 7.30 | 7.30 |
| Jan 18 | 28.8 | 12.2 | 0.92 | 0.92 | 7.70 | 7.70 |
| Jan 19 | 28.7 | 12.2 | 0.97 | 0.97 | 8.20 | 8.20 |
| Jan 20 | 28.7 | 12.1 | 1.02 | 1.02 | 8.60 | 8.60 |
| Jan 21 | 28.8 | 12.1 | 1.07 | 1.07 | 9.00 | 9.00 |
| Jan 22 | 28.8 | 12.1 | 1.11 | 1.11 | 9.40 | 9.40 |
| Jan 23 | 28.8 | 12.1 | 1.16 | 1.16 | 9.80 | 9.80 |
| Jan 24 | 28.9 | 12.1 | 1.21 | 1.21 | 10.20 | 10.20 |
| Jan 25 | 28.9 | 12.1 | 1.25 | 1.25 | 10.50 | 10.50 |
| Jan 26 | 29.0 | 12.2 | 1.30 | 1.30 | 10.90 | 10.90 |
| Jan 27 | 29.1 | 12.3 | 1.34 | 1.34 | 11.30 | 11.30 |
| Jan 28 | 29.2 | 12.4 | 1.38 | 1.38 | 11.60 | 11.60 |
| Jan 29 | 29.4 | 12.5 | 1.43 | 1.43 | 12.00 | 12.00 |
| Jan 30 | 29.5 | 12.6 | 1.47 | 1.47 | 12.30 | 12.30 |
| Jan 31 | 29.6 | 12.7 | 1.52 | 1.52 | 12.70 | 12.70 |
Precipitation and snow add up through the month (/mo) and the year (/yr)
Weather history Walnut - September 2026
| Day | HighºF | LowºF | Precip.inch |
|---|---|---|---|
| Sep 1 | 90.0 | 69.1 | T |
| Sep 2 | 93.9 | 75.0 | 0.00 |
| Sep 3 | 95.0 | 73.9 | 0.00 |
| Sep 4 | 93.9 | 75.9 | 0.00 |
| Sep 5 | 95.0 | 73.0 | 0.00 |
| Sep 6 | 89.1 | 66.0 | 0.00 |
| Sep 7 | 84.9 | 59.0 | 0.00 |
| Sep 8 | 82.0 | 61.0 | 0.00 |
| Sep 9 | 88.0 | 63.0 | 0.60 |
| Sep 10 | 79.0 | 66.9 | 0.10 |
| Sep 11 | 81.0 | 60.1 | 0.00 |
| Sep 12 | 82.9 | 60.1 | 0.00 |
| Sep 13 | 84.9 | 55.0 | 0.00 |
| Sep 14 | 72.0 | 50.0 | – |
| Sep 15 | 73.0 | 59.0 | 0.20 |
| Sep 16 | 84.0 | 64.0 | 0.30 |
| Sep 17 | 73.0 | 64.9 | 0.30 |
| Sep 18 | 88.0 | 64.9 | T |
| Sep 19 | 75.9 | 64.0 | – |
| Sep 20 | 70.0 | 63.0 | 2.90 |
| Sep 21 | 69.1 | 57.9 | 0.60 |
| Sep 22 | 66.0 | 57.0 | T |
| Sep 23 | 64.9 | 53.1 | 0.00 |
| Sep 24 | 71.1 | 53.1 | 0.00 |
| Sep 25 | 72.0 | 54.0 | T |
| Sep 26 | 69.1 | 50.0 | 0.00 |
| Sep 27 | 73.0 | 50.0 | 0.00 |
| Sep 28 | 77.0 | 46.9 | 0.00 |
| Sep 29 | 79.0 | 46.0 | 0.00 |
| Sep 30 | 82.0 | 59.0 | 0.60 |
The data for September 2026 is incomplete: some days or values are missing.
- –No data
- –Not yet observed or received
- TTrace, too small to measure
Observed extremes
- Highest max temperature95.0ºF · Sep 3
- Lowest max temperature64.9ºF · Sep 23
- Highest min temperature75.9ºF · Sep 4
- Lowest min temperature46.0ºF · Sep 29
Geo Walnut - Illinois
Location
- Country
- United States
- State
- Illinois
- County
- Bureau
- City
- Walnut
- Zip Code
- 61376
- Elevation
- 715 ft
- Longitude
- -89.59
- Latitude
- 41.56
- ICAO
- –
- IATA
- –