Weather in Green Bay, Wisconsin
Roses open along the stoops. Day 59 of spring. Read this microseason across nine climate regions →
- TodayMay 16Light Drizzle58%87°59°
- SundayMay 17Rain52%61°51°
- MondayMay 18Light Showers76%75°54°
- TuesdayMay 19Light Showers79%70°51°
- WednesdayMay 20Overcast—55°38°
- ThursdayMay 21Overcast—58°35°
- FridayMay 22Light Drizzle10%58°43°
- PM 2.5
- 8.9 μg/m³
- PM 10
- 10.2 μg/m³
- NO₂
- 9.2 μg/m³
- Ozone
- 68.0 μg/m³
- UV Index
- 0.0 Low
When the dew is on the grass, rain will never come to pass.
- Moonrise
- 10:22 AM
- Moonset
- 1:49 AM
- In sign
- ♊︎ Gemini
Roses open along the stoops
Green Bay at a glance
- Today vs. normal: 4°F below the seasonal normal for this latitude
- Last frost: May 13 (climatological average for this latitude)
- Microseason: 28 of 72, May 16–20
- Planting window: Direct sow okra, melons, and southern peas. Thin carrot rows.
Right now in the garden
Cool-season window is open
As of May 17, the cool-season window is open or about to open. Direct-sow peas, lettuce, spinach, radishes, and brassicas now. Hold off on warm-season crops until 1–2 weeks after the last spring frost (around May).
Planting calendar
| Month | Plant | Harvest |
|---|---|---|
| January | — | — |
| February | — | — |
| March | — | — |
| April | — | — |
| May | lettuce, peas, spinach, radishes | lettuce, peas, radishes |
| June | lettuce, peas, spinach, radishes, tomatoes, peppers, beans, squash | lettuce, peas, radishes |
| July | tomatoes, peppers, beans, squash | tomatoes, beans, summer squash |
| August | tomatoes, peppers, beans, squash, fall brassicas, garlic (overwinter), carrots | tomatoes, beans, summer squash |
| September | fall brassicas, garlic (overwinter), carrots | tomatoes, beans, summer squash |
| October | — | winter squash, tomatoes (last) |
| November | — | — |
| December | — | — |
A year in weather
July brings Green Bay's warmest temperatures (~69°F mean) while January delivers the coldest (~17°F). June sees peak rainfall (4.2 inches) and February marks the driest period (1.1 inches).
| Month | Mean temp | Precip | Rainy days |
|---|---|---|---|
| January | 17° | 1.3″ | 4 |
| February | 20° | 1.1″ | 4 |
| March | 31° | 1.9″ | 6 |
| April | 43° | 3.1″ | 10 |
| May | 56° | 3.6″ | 12 |
| June | 65° | 4.2″ | 14 |
| July | 69° | 3.7″ | 12 |
| August | 68° | 3.4″ | 11 |
| September | 60° | 3.4″ | 11 |
| October | 49° | 2.8″ | 9 |
| November | 36° | 2.0″ | 7 |
| December | 24° | 1.8″ | 6 |
Regional context
Green Bay belongs to a warm-summer humid continental climate region — sharing similar temperature ranges, seasonal patterns, and growing conditions with nearby cities.
Similar climates: Milwaukee, WI, Madison, WI, Appleton, WI, Racine, WI, Kenosha, WI.
Naturalist notes
American robins return to Green Bay lawns in late March, their red breasts signaling winter's retreat across Wisconsin.
Sugar maples begin leafing out in early May, their tender green unfurling as soil temperatures climb past the 45°F threshold.
Frequently asked
- When does it freeze in Green Bay?
- Green Bay's last spring frost typically occurs around mid-May, with the first fall frost returning around mid-October.
- What is the rainy season in Green Bay?
- June receives the most rainfall with about 4.2 inches on average; the city gets roughly 32 inches annually.
- What is the warmest month in Green Bay?
- July typically brings the warmest weather, averaging about 69°F.
- What is the coldest month in Green Bay?
- January typically delivers the coldest temperatures, averaging about 17°F.
- When can I start a vegetable garden in Green Bay?
- Cool-season crops (peas, lettuce) can be planted around the last spring frost (mid-May); warm-season crops (tomatoes, peppers) should wait until 1–2 weeks after.
- How many rainy days does Green Bay get?
- Green Bay experiences about 106 rainy days per year on average.
- What hardiness zone is Green Bay?
- Green Bay's USDA hardiness zone depends on its lowest average winter temperature; use the USDA's online lookup with the city ZIP for the current zone designation.
Climate
Green Bay, Wisconsin experiences a warm-summer humid continental climate zone. January temperatures hover near 17°F while July averages 69°F — creating a 53°F seasonal swing.
Throughout the year, Green Bay receives about 32 inches of precipitation spread over roughly 106 rainy days.
Latitude (44.5°N), proximity to large water bodies, and elevation determine the rhythm of the year — shaping what grows here, when frost arrives, and daily weather patterns.