Climate averages 1991–2020
Green Bay weather
in May.
A mild, moderately wet month: the 5th warmest and the 9th driest of the year.
Long-term climate patterns, not a forecast for a particular trip.
May is a mild month in Green Bay: daytime highs average 18.5°C and nights cool to about 8.7°C. By daytime temperature it is the 5th warmest of the 12 months.
Expect about 86 mm of rain on roughly 11 days, which makes May a moderately wet month (the 9th driest of the 12 months). Daylight, from sunrise to sunset, lasts about 14 h 46 min on an average May day.
The nearest other city in this atlas is Appleton (42 km away). In May its highs average 18.5°C, about as warm as Green Bay, with 85 mm of rain.
Among the 498 cities listed in the United States, Green Bay ranks joint 461st of 498 for the warmest May highs and joint 259th of 498 for the driest May (rainfall, lowest first). The mean May high of those 498 cities is 23.8°C; Green Bay is 5.3°C cooler than that mean.
From May to June, average highs rise by 5.6°C to 24.1°C, and monthly rainfall rises from 86 mm to 91 mm.
The annual picture
May in context
Monthly precipitation
Average total · mmAverages from hourly ERA5 reanalysis data. Actual weather varies from year to year. How these numbers are calculated
Every month, side by side
Green Bay climate table
| Month | Average highHigh / low | Average low | Precipitation mm/month | Wet days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | -4.1°C-11.9°C | -11.9°C | 37 | 7.6 | 9.29 h |
| February | -2.3°C-10.8°C | -10.8°C | 33 | 6.5 | 10.410 h |
| March | 4.2°C-5.1°C | -5.1°C | 56 | 8.3 | 11.912 h |
| April | 11.3°C1.6°C | 1.6°C | 80 | 11.4 | 13.413 h |
| May, selected | 18.5°C8.7°C | 8.7°C | 86 | 11.4 | 14.815 h |
| June | 24.1°C14.9°C | 14.9°C | 91 | 11.2 | 15.515 h |
| July | 26.7°C17.8°C | 17.8°C | 88 | 11.2 | 15.215 h |
| August | 25.6°C17.3°C | 17.3°C | 87 | 10.4 | 14.014 h |
| September | 21.5°C13.3°C | 13.3°C | 67 | 9.1 | 12.613 h |
| October | 14.0°C6.6°C | 6.6°C | 71 | 9.5 | 11.011 h |
| November | 6.1°C-0.4°C | -0.4°C | 54 | 8.2 | 9.610 h |
| December | -0.6°C-7.2°C | -7.2°C | 45 | 7.3 | 8.99 h |
Precipitation (rain or snow, as water) is the average of the 30 separate monthly totals. A wet day is a local calendar day with at least 1 mm of precipitation. Daylight is the calculated sunrise-to-sunset length, not measured sunshine.
Compare places
May in nearby cities
- Appleton in MayUnited States · 42 kmHigh 18.5°C · Low 8.7°C · 85 mm rain
- Milwaukee in MayUnited States · 165 kmHigh 14.4°C · Low 9.4°C · 91 mm rain
- Waukesha in MayUnited States · 168 kmHigh 18.9°C · Low 9.5°C · 95 mm rain
- Madison in MayUnited States · 195 kmHigh 19.8°C · Low 9.6°C · 101 mm rain
- Racine in MayUnited States · 200 kmHigh 13.8°C · Low 9.6°C · 90 mm rain
- Kenosha in MayUnited States · 216 kmHigh 13.9°C · Low 9.7°C · 96 mm rain
- Waukegan in MayUnited States · 240 kmHigh 14.5°C · Low 10.1°C · 105 mm rain
- Grand Rapids in MayUnited States · 256 kmHigh 19.6°C · Low 9.7°C · 108 mm rain
Read the numbers correctly
Climate, not a promise.
These patterns help compare months. They cannot tell you the weather on a specific day of your trip.
Sources, method and limitsHow these numbers are made (what the highs, lows and rain days mean, the sources and the model cell used for Green Bay) is explained once on the Green Bay year overview and on the Sources, method and limits page.