Climate Janesville - Wisconsin
| JanJa | FebFe | MarMa | AprAp | MayMa | JunJu | |
|---|---|---|---|---|---|---|
| Average high in ºF Av. high Hi | 28 | 33 | 45 | 58 | 70 | 80 |
| Average low in ºF Av. low Lo | 11 | 15 | 26 | 37 | 47 | 57 |
| Av. precipitation in inch Av. precip. Pre. | 1.37 | 1.43 | 1.96 | 3.45 | 3.77 | 4.36 |
| Av. snowfall in inch Snowfall Sn | 11 | 9 | 4 | 1 | 0 | 0 |
| JulJu | AugAu | SepSe | OctOc | NovNo | DecDe | |
|---|---|---|---|---|---|---|
| Average high in ºF Av. high Hi | 83 | 81 | 74 | 61 | 46 | 32 |
| Average low in ºF Av. low Lo | 61 | 59 | 50 | 38 | 29 | 15 |
| Av. precipitation in inch Av. precip. Pre. | 3.78 | 4.47 | 3.31 | 2.93 | 2.44 | 1.88 |
| Av. snowfall in inch Snowfall Sn | 0 | 0 | 0 | 0 | 2 | 9 |
What is the average weather in Janesville, Wisconsin?
Janesville experiences a humid continental climate, marked by very large seasonal temperature contrasts. Summers are warm and fairly wet, with August being the wettest month. Winters are cold and snowy, bringing significant snowfall, while January is typically the driest month overall. Precipitation is spread relatively evenly throughout the year, with winter moisture often arriving as snow.
Janesville Climate Graph - Wisconsin Climate Chart
Daily normals Janesville - Wisconsin - January
Day | High ºF | Low ºF | Prec/mo inch | Prec/yr inch | Snow/mo inch | Snow/yr inch |
|---|---|---|---|---|---|---|
| 1 Jan | 28.1 | 11.8 | 0.04 | 0.04 | 3.15 | 8.00 |
| 2 Jan | 28.1 | 11.7 | 0.12 | 0.12 | 5.91 | 15.00 |
| 3 Jan | 28.0 | 11.6 | 0.16 | 0.16 | 9.06 | 23.00 |
| 4 Jan | 28.0 | 11.5 | 0.20 | 0.20 | 11.81 | 30.00 |
| 5 Jan | 28.0 | 11.4 | 0.24 | 0.24 | 14.96 | 38.00 |
| 6 Jan | 27.9 | 11.4 | 0.28 | 0.28 | 18.11 | 46.00 |
| 7 Jan | 27.9 | 11.3 | 0.31 | 0.31 | 20.87 | 53.00 |
| 8 Jan | 27.9 | 11.2 | 0.35 | 0.35 | 25.20 | 64.00 |
| 9 Jan | 27.9 | 11.2 | 0.43 | 0.43 | 27.95 | 71.00 |
| 10 Jan | 27.9 | 11.1 | 0.47 | 0.47 | 31.10 | 79.00 |
| 11 Jan | 27.9 | 11.1 | 0.51 | 0.51 | 35.04 | 89.00 |
| 12 Jan | 28.0 | 11.1 | 0.55 | 0.55 | 38.98 | 99.00 |
| 13 Jan | 28.0 | 11.0 | 0.59 | 0.59 | 42.91 | 109.00 |
| 14 Jan | 28.0 | 11.0 | 0.67 | 0.67 | 46.06 | 117.00 |
| 15 Jan | 28.0 | 11.0 | 0.71 | 0.71 | 50.00 | 127.00 |
| 16 Jan | 28.1 | 10.9 | 0.75 | 0.75 | 53.94 | 137.00 |
| 17 Jan | 28.1 | 10.9 | 0.79 | 0.79 | 57.87 | 147.00 |
| 18 Jan | 28.2 | 10.9 | 0.83 | 0.83 | 61.81 | 157.00 |
| 19 Jan | 28.2 | 10.9 | 0.87 | 0.87 | 66.14 | 168.00 |
| 20 Jan | 28.3 | 10.9 | 0.91 | 0.91 | 68.90 | 175.00 |
| 21 Jan | 28.3 | 11.0 | 0.94 | 0.94 | 72.05 | 183.00 |
| 22 Jan | 28.4 | 11.0 | 0.98 | 0.98 | 75.98 | 193.00 |
| 23 Jan | 28.5 | 11.0 | 1.02 | 1.02 | 79.13 | 201.00 |
| 24 Jan | 28.6 | 11.0 | 1.06 | 1.06 | 81.89 | 208.00 |
| 25 Jan | 28.7 | 11.1 | 1.10 | 1.10 | 85.83 | 218.00 |
| 26 Jan | 28.8 | 11.1 | 1.14 | 1.14 | 88.98 | 226.00 |
| 27 Jan | 28.9 | 11.2 | 1.18 | 1.18 | 92.91 | 236.00 |
| 28 Jan | 29.0 | 11.3 | 1.22 | 1.22 | 96.06 | 244.00 |
| 29 Jan | 29.1 | 11.4 | 1.30 | 1.30 | 100.00 | 254.00 |
| 30 Jan | 29.2 | 11.5 | 1.34 | 1.34 | 103.94 | 264.00 |
| 31 Jan | 29.3 | 11.6 | 1.38 | 1.38 | 107.87 | 274.00 |
Weather history Janesville - May 2026
| Day | High ºF | Low ºF | Precip. inch | Snow inch | Snow d. inch |
|---|---|---|---|---|---|
| 01 May | 54.0 | 37.0 | 0.12 | - | - |
| 02 May | 52.0 | 30.9 | T | - | - |
| 03 May | 57.9 | 32.0 | T | - | - |
| 04 May | 70.0 | 41.0 | T | - | - |
| 05 May | 81.0 | 45.0 | 0.00 | - | - |
| 06 May | 81.0 | 33.1 | 0.00 | 0.00 | 0.0 |
| 07 May | 55.0 | 30.9 | 0.00 | - | - |
| 08 May | 64.0 | 34.0 | 0.00 | - | - |
| 09 May | - | - | - | - | - |
| 10 May | - | - | - | - | - |
| 11 May | 64.9 | 39.9 | 0.00 | - | - |
| 12 May | 64.0 | 39.9 | 0.00 | - | - |
| 13 May | 75.0 | 45.0 | 0.01 | - | - |
| 14 May | 66.0 | 37.0 | 0.00 | - | - |
| 15 May | 73.0 | 43.0 | 0.00 | - | - |
| 16 May | 81.0 | 57.9 | 0.14 | - | - |
| 17 May | 84.0 | 60.1 | 0.00 | - | - |
| 18 May | 84.0 | 62.1 | 0.08 | 0.00 | 0.0 |
| 19 May | 81.0 | 64.0 | 0.11 | 0.00 | 0.0 |
| 20 May | 75.0 | 44.1 | 0.00 | 0.00 | 0.0 |
| 21 May | 66.9 | 44.1 | 0.00 | - | - |
| 22 May | 59.0 | 46.0 | 0.00 | - | - |
| 23 May | 70.0 | 50.0 | 0.00 | - | - |
| 24 May | 78.1 | 55.9 | 0.01 | - | - |
| 25 May | 81.0 | 53.1 | 0.00 | 0.00 | 0.0 |
| 26 May | 86.0 | 57.0 | 0.00 | 0.00 | 0.0 |
| 27 May | 90.0 | 57.0 | 0.00 | - | - |
| 28 May | 90.0 | 57.0 | 0.00 | - | - |
| 29 May | 82.0 | 46.9 | 0.00 | - | - |
| 30 May | - | - | - | - | - |
| 31 May | - | - | - | - | - |
Past weather Janesville
| May 26 | Normal | ||
|---|---|---|---|
| Average high temperature Av. high temp. | 72.8 ºF | 28 ºF | |
| Average low temperature Av. low temp. | 46.1 ºF | 11 ºF | |
| Total precipitation Total precip. | 0.47 inch | 1.37 inch | |
| Total snowfall Total snowfall | - inch | 11 inch | |
| Highest max temperature Highest max temp. | 90.0 ºF | - | |
| Lowest max temperature Lowest max temp. | 52.0 ºF | - | |
| Highest min temperature Highest min temp. | 64.0 ºF | - | |
| Lowest min temperature Lowest min temp. | 30.9 ºF | - | |
Past weather May 2026 incomplete - Missing data
Geo Janesville - Wisconsin
| Country | United States | |
|---|---|---|
| State | Wisconsin | |
| County | - | |
| City | Janesville | |
| Zip Code | 53545 | |
| Longitude | -89.02 dec. degr. | |
| Latitude | 42.68 dec. degr. | |
| Altitude - Elevation | 837ft | |
| ICAO | - | |
| IATA | - |
Date and Time Janesville - Wisconsin
| Local Time | 12:48 PM | |
|---|---|---|
| Sunrise | 05:22 AM | |
| Sunset | 08:38 PM | |
| Day/Night | Day | |
| Timezone | Central Daylight Time | |
| Timezone DB | America - Chicago |
Map of Janesville - Wisconsin
USGS National Map — Open interactive map
Janesville weather averages
| Annual high temperature | 58ºF |
| Annual low temperature | 37ºF |
| Average annual precip. | 35.15 inch |
| Av. annual snowfall | 36 inch |
Station Data
Monthly averages Janesville
Longitude: -89.0187, Latitude: 42.6828
Average weather Janesville, WI - 53545
Monthly: 1991-2020 normals
History: 2008-2026
Abbreviations
Average precipitation in : Av. precipitation in
Jan: January, Feb: February, ...Jan: January, Feb: February, ...Ja: January, Fe: February, ...