Hot-summer humid continental climate
Climate Mount Vernon - Illinois
Annual high64ºF
Annual low44ºF
Precipitation43.4 inch
| Month | HighºF | LowºF | Precipinch | Snowinch |
|---|---|---|---|---|
| Jan | 38 | 21 | 2.34 | 4 |
| Feb | 43 | 24 | 2.85 | 5 |
| Mar | 53 | 33 | 3.87 | 1 |
| Apr | 65 | 44 | 4.36 | 0 |
| May | 74 | 54 | 5.16 | 0 |
| Jun | 83 | 63 | 3.88 | 0 |
| Jul | 86 | 67 | 3.68 | 0 |
| Aug | 86 | 65 | 2.96 | 0 |
| Sep | 79 | 56 | 3.22 | 0 |
| Oct | 67 | 44 | 3.65 | 0 |
| Nov | 55 | 35 | 4.21 | 0 |
| Dec | 41 | 24 | 3.22 | 4 |
- JanHigh 38ºFLow 21ºFPrecip 2.34 inch
- FebHigh 43ºFLow 24ºFPrecip 2.85 inch
- MarHigh 53ºFLow 33ºFPrecip 3.87 inch
- AprHigh 65ºFLow 44ºFPrecip 4.36 inch
- MayHigh 74ºFLow 54ºFPrecip 5.16 inch
- JunHigh 83ºFLow 63ºFPrecip 3.88 inch
- JulHigh 86ºFLow 67ºFPrecip 3.68 inch
- AugHigh 86ºFLow 65ºFPrecip 2.96 inch
- SepHigh 79ºFLow 56ºFPrecip 3.22 inch
- OctHigh 67ºFLow 44ºFPrecip 3.65 inch
- NovHigh 55ºFLow 35ºFPrecip 4.21 inch
- DecHigh 41ºFLow 24ºFPrecip 3.22 inch
Climate summary
What is the average weather in Mount Vernon, Illinois?
Mount Vernon experiences a humid continental climate, characterized by very strong seasonal temperature contrasts. Summers are warm, while winters are cold and bring regular snowfall. The area is fairly wet overall, with precipitation spread relatively evenly throughout the year, though spring tends to be wetter and winter is the driest season.
Mount Vernon weather averages
Annual high64ºF
Annual low44ºF
Precipitation43.4 inch
Snowfall14 inch
Daily normals Mount Vernon - Illinois - January
| Day | HighºF | LowºF | Prec/ | Prec/ | Snow/ | Snow/ |
|---|---|---|---|---|---|---|
| Jan 1 | 39.2 | 23.1 | 0.09 | 0.09 | 0.10 | 0.10 |
| Jan 2 | 39.0 | 22.9 | 0.17 | 0.17 | 0.20 | 0.20 |
| Jan 3 | 38.9 | 22.7 | 0.26 | 0.26 | 0.30 | 0.30 |
| Jan 4 | 38.7 | 22.6 | 0.34 | 0.34 | 0.40 | 0.40 |
| Jan 5 | 38.6 | 22.5 | 0.42 | 0.42 | 0.50 | 0.50 |
| Jan 6 | 38.5 | 22.3 | 0.51 | 0.51 | 0.60 | 0.60 |
| Jan 7 | 38.4 | 22.2 | 0.59 | 0.59 | 0.80 | 0.80 |
| Jan 8 | 38.3 | 22.1 | 0.67 | 0.67 | 0.90 | 0.90 |
| Jan 9 | 38.2 | 21.9 | 0.75 | 0.75 | 1.00 | 1.00 |
| Jan 10 | 38.1 | 21.8 | 0.84 | 0.84 | 1.10 | 1.10 |
| Jan 11 | 38.1 | 21.7 | 0.92 | 0.92 | 1.20 | 1.20 |
| Jan 12 | 38.0 | 21.6 | 1.00 | 1.00 | 1.30 | 1.30 |
| Jan 13 | 38.0 | 21.5 | 1.09 | 1.09 | 1.40 | 1.40 |
| Jan 14 | 38.0 | 21.4 | 1.18 | 1.18 | 1.50 | 1.50 |
| Jan 15 | 38.0 | 21.4 | 1.27 | 1.27 | 1.60 | 1.60 |
| Jan 16 | 38.0 | 21.3 | 1.36 | 1.36 | 1.70 | 1.70 |
| Jan 17 | 38.0 | 21.3 | 1.45 | 1.45 | 1.80 | 1.80 |
| Jan 18 | 38.0 | 21.2 | 1.54 | 1.54 | 1.90 | 1.90 |
| Jan 19 | 38.1 | 21.2 | 1.63 | 1.63 | 2.00 | 2.00 |
| Jan 20 | 38.1 | 21.2 | 1.71 | 1.71 | 2.10 | 2.10 |
| Jan 21 | 38.2 | 21.1 | 1.79 | 1.79 | 2.20 | 2.20 |
| Jan 22 | 38.3 | 21.2 | 1.87 | 1.87 | 2.30 | 2.30 |
| Jan 23 | 38.4 | 21.2 | 1.95 | 1.95 | 2.40 | 2.40 |
| Jan 24 | 38.5 | 21.2 | 2.04 | 2.04 | 2.50 | 2.50 |
| Jan 25 | 38.7 | 21.2 | 2.12 | 2.12 | 2.60 | 2.60 |
| Jan 26 | 38.8 | 21.3 | 2.20 | 2.20 | 2.70 | 2.70 |
| Jan 27 | 38.9 | 21.4 | 2.29 | 2.29 | 2.80 | 2.80 |
| Jan 28 | 39.1 | 21.4 | 2.36 | 2.36 | 2.90 | 2.90 |
| Jan 29 | 39.3 | 21.5 | 2.44 | 2.44 | 3.00 | 3.00 |
| Jan 30 | 39.5 | 21.6 | 2.52 | 2.52 | 3.10 | 3.10 |
| Jan 31 | 39.7 | 21.8 | 2.60 | 2.60 | 3.20 | 3.20 |
Precipitation and snow add up through the month (/mo) and the year (/yr)
Weather history Mount Vernon - October 2026
| Day | HighºF | LowºF | Precip.inch |
|---|---|---|---|
| Oct 1 | 93.0 | 70.0 | 0.02 |
| Oct 2 | 72.0 | 57.9 | 0.11 |
| Oct 3 | – | – | – |
| Oct 4 | – | – | – |
| Oct 5 | – | – | – |
| Oct 6 | 80.1 | 39.0 | 0.00 |
| Oct 7 | 90.0 | 42.1 | 0.00 |
| Oct 8 | 87.1 | 45.0 | 0.00 |
| Oct 9 | 91.0 | 43.0 | 0.00 |
| Oct 10 | 77.0 | 48.9 | 0.00 |
| Oct 11 | 86.0 | 53.1 | 0.00 |
| Oct 12 | 93.0 | 53.1 | 0.00 |
| Oct 13 | 93.0 | 59.0 | 0.00 |
| Oct 14 | 78.1 | 66.0 | 0.17 |
| Oct 15 | 82.0 | 66.0 | 0.12 |
| Oct 16 | – | – | – |
| Oct 17 | 60.1 | 36.0 | 0.00 |
| Oct 18 | – | – | – |
| Oct 19 | – | – | – |
| Oct 20 | 75.0 | 43.0 | 0.00 |
| Oct 21 | 75.0 | 37.9 | 0.00 |
| Oct 22 | – | – | – |
| Oct 23 | 75.0 | 45.0 | 0.00 |
| Oct 24 | 77.0 | 39.9 | 0.00 |
| Oct 25 | 80.1 | 39.9 | 0.00 |
| Oct 26 | 75.9 | 44.1 | 0.00 |
| Oct 27 | 75.0 | 43.0 | 0.00 |
| Oct 28 | 79.0 | 41.0 | 0.00 |
| Oct 29 | – | – | – |
| 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 temperature93.0ºF · Oct 1
- Lowest max temperature60.1ºF · Oct 17
- Highest min temperature70.0ºF · Oct 1
- Lowest min temperature36.0ºF · Oct 17
Geo Mount Vernon - Illinois
Location
- Country
- United States
- State
- Illinois
- County
- –
- City
- Mount Vernon
- Zip Code
- 62864
- Elevation
- 512 ft
- Longitude
- -88.90
- Latitude
- 38.32
- ICAO
- –
- IATA
- –