Hot-summer humid continental climate
Climate Geneseo - Illinois
Annual high60ºF
Annual low41ºF
Precipitation37.81 inch
| Month | HighºF | LowºF | Precipinch | Snowinch |
|---|---|---|---|---|
| Jan | 31 | 15 | 1.42 | 8 |
| Feb | 35 | 19 | 1.62 | 5 |
| Mar | 48 | 29 | 2.69 | 2 |
| Apr | 62 | 40 | 3.66 | 1 |
| May | 73 | 51 | 4.20 | 0 |
| Jun | 82 | 61 | 4.06 | 0 |
| Jul | 85 | 65 | 4.05 | 0 |
| Aug | 83 | 63 | 4.41 | 0 |
| Sep | 76 | 54 | 3.35 | 0 |
| Oct | 63 | 43 | 3.38 | 0 |
| Nov | 48 | 31 | 2.80 | 1 |
| Dec | 34 | 19 | 2.17 | 8 |
- JanHigh 31ºFLow 15ºFPrecip 1.42 inch
- FebHigh 35ºFLow 19ºFPrecip 1.62 inch
- MarHigh 48ºFLow 29ºFPrecip 2.69 inch
- AprHigh 62ºFLow 40ºFPrecip 3.66 inch
- MayHigh 73ºFLow 51ºFPrecip 4.20 inch
- JunHigh 82ºFLow 61ºFPrecip 4.06 inch
- JulHigh 85ºFLow 65ºFPrecip 4.05 inch
- AugHigh 83ºFLow 63ºFPrecip 4.41 inch
- SepHigh 76ºFLow 54ºFPrecip 3.35 inch
- OctHigh 63ºFLow 43ºFPrecip 3.38 inch
- NovHigh 48ºFLow 31ºFPrecip 2.80 inch
- DecHigh 34ºFLow 19ºFPrecip 2.17 inch
Climate summary
What is the average weather in Geneseo, Illinois?
Geneseo experiences a humid continental climate, marked by a very large seasonal temperature contrast. Summers are warm and bring the wettest conditions, with precipitation peaking in August. Winters are cold and see regular snowfall, contributing to the fairly wet annual precipitation that is spread relatively evenly throughout the year.
Geneseo weather averages
Annual high60ºF
Annual low41ºF
Precipitation37.81 inch
Snowfall25 inch
Daily normals Geneseo - Illinois - January
| Day | HighºF | LowºF | Prec/ | Prec/ | Snow/ | Snow/ |
|---|---|---|---|---|---|---|
| Jan 1 | 31.8 | 16.6 | 0.05 | 0.05 | 0.30 | 0.30 |
| Jan 2 | 31.6 | 16.3 | 0.11 | 0.11 | 0.50 | 0.50 |
| Jan 3 | 31.5 | 16.1 | 0.16 | 0.16 | 0.80 | 0.80 |
| Jan 4 | 31.4 | 15.9 | 0.22 | 0.22 | 1.10 | 1.10 |
| Jan 5 | 31.2 | 15.7 | 0.27 | 0.27 | 1.40 | 1.40 |
| Jan 6 | 31.1 | 15.5 | 0.33 | 0.33 | 1.70 | 1.70 |
| Jan 7 | 31.0 | 15.4 | 0.39 | 0.39 | 2.00 | 2.00 |
| Jan 8 | 30.9 | 15.2 | 0.44 | 0.44 | 2.30 | 2.30 |
| Jan 9 | 30.8 | 15.0 | 0.50 | 0.50 | 2.60 | 2.60 |
| Jan 10 | 30.7 | 14.8 | 0.55 | 0.55 | 2.90 | 2.90 |
| Jan 11 | 30.6 | 14.7 | 0.61 | 0.61 | 3.20 | 3.20 |
| Jan 12 | 30.5 | 14.5 | 0.66 | 0.66 | 3.60 | 3.60 |
| Jan 13 | 30.5 | 14.4 | 0.71 | 0.71 | 3.90 | 3.90 |
| Jan 14 | 30.4 | 14.3 | 0.77 | 0.77 | 4.20 | 4.20 |
| Jan 15 | 30.4 | 14.2 | 0.82 | 0.82 | 4.50 | 4.50 |
| Jan 16 | 30.4 | 14.1 | 0.87 | 0.87 | 4.80 | 4.80 |
| Jan 17 | 30.4 | 14.0 | 0.92 | 0.92 | 5.20 | 5.20 |
| Jan 18 | 30.3 | 13.9 | 0.97 | 0.97 | 5.50 | 5.50 |
| Jan 19 | 30.3 | 13.9 | 1.03 | 1.03 | 5.80 | 5.80 |
| Jan 20 | 30.4 | 13.8 | 1.08 | 1.08 | 6.20 | 6.20 |
| Jan 21 | 30.4 | 13.8 | 1.13 | 1.13 | 6.50 | 6.50 |
| Jan 22 | 30.4 | 13.8 | 1.18 | 1.18 | 6.80 | 6.80 |
| Jan 23 | 30.5 | 13.8 | 1.23 | 1.23 | 7.20 | 7.20 |
| Jan 24 | 30.5 | 13.8 | 1.29 | 1.29 | 7.50 | 7.50 |
| Jan 25 | 30.6 | 13.9 | 1.34 | 1.34 | 7.80 | 7.80 |
| Jan 26 | 30.7 | 13.9 | 1.39 | 1.39 | 8.20 | 8.20 |
| Jan 27 | 30.8 | 14.0 | 1.44 | 1.44 | 8.50 | 8.50 |
| Jan 28 | 30.9 | 14.1 | 1.49 | 1.49 | 8.80 | 8.80 |
| Jan 29 | 31.1 | 14.2 | 1.54 | 1.54 | 9.20 | 9.20 |
| Jan 30 | 31.2 | 14.3 | 1.59 | 1.59 | 9.50 | 9.50 |
| Jan 31 | 31.4 | 14.5 | 1.64 | 1.64 | 9.80 | 9.80 |
Precipitation and snow add up through the month (/mo) and the year (/yr)
Weather history Geneseo - October 2026
| Day | HighºF | LowºF | Precip.inch |
|---|---|---|---|
| Oct 1 | 70.0 | 60.1 | 1.02 |
| Oct 2 | 68.0 | 48.0 | 0.00 |
| Oct 3 | 73.0 | 44.1 | 0.00 |
| Oct 4 | – | – | – |
| Oct 5 | – | – | – |
| Oct 6 | 78.1 | 55.0 | 0.00 |
| Oct 7 | 81.0 | 55.0 | 0.00 |
| Oct 8 | 77.0 | 52.0 | 0.00 |
| Oct 9 | 80.1 | 53.1 | 0.23 |
| Oct 10 | 84.0 | 61.0 | 0.00 |
| Oct 11 | 84.0 | 52.0 | 0.00 |
| Oct 12 | 88.0 | 64.9 | 0.00 |
| Oct 13 | 77.0 | 61.0 | 0.02 |
| Oct 14 | 68.0 | 60.1 | 0.00 |
| Oct 15 | 64.9 | 52.0 | 0.40 |
| Oct 16 | 55.9 | 42.1 | 0.06 |
| Oct 17 | – | – | – |
| Oct 18 | 66.0 | 39.9 | 0.00 |
| Oct 19 | – | – | – |
| Oct 20 | – | – | – |
| Oct 21 | 73.0 | 43.0 | 0.00 |
| Oct 22 | 75.9 | 46.0 | 0.00 |
| Oct 23 | 75.9 | 46.9 | 0.00 |
| Oct 24 | 75.0 | 54.0 | 0.00 |
| Oct 25 | 78.1 | 46.9 | 0.00 |
| Oct 26 | 66.9 | 51.1 | 0.00 |
| Oct 27 | 72.0 | 46.9 | 0.00 |
| Oct 28 | 78.1 | 57.9 | 0.00 |
| Oct 29 | 70.0 | 46.0 | 0.02 |
| Oct 30 | – | – | – |
| Oct 31 | – | – | – |
The data for October 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 temperature88.0ºF · Oct 12
- Lowest max temperature55.9ºF · Oct 16
- Highest min temperature64.9ºF · Oct 12
- Lowest min temperature39.9ºF · Oct 18
Geo Geneseo - Illinois
Location
- Country
- United States
- State
- Illinois
- County
- Henry
- City
- Geneseo
- Zip Code
- 61254
- Elevation
- 643 ft
- Longitude
- -90.11
- Latitude
- 41.44
- ICAO
- –
- IATA
- –