Fitchburg, Wisconsin Weather
Fireflies rise from the lawn. Day 77 of spring. Read this microseason across nine climate regions →
Fitchburg weather forecast — hour by hour, 7-day outlook, NOAA radar
- TodayJun 4Overcast——85°57°—
- FridayJun 5Light Showers89%0.85″75°67°-10°
- SaturdayJun 6Light Showers44%—83°63°+8°
- SundayJun 7Overcast14%—79°63°-4°
- MondayJun 8Light Showers45%0.38″76°63°-3°
- TuesdayJun 9Drizzle35%0.23″83°68°+7°
- WednesdayJun 10Drizzle21%0.18″81°68°-2°
PM2.5 at 7.7 µg/m³ (AQI 43) with a 0.84 fine-to-coarse ratio and 6 mph wind — combustion smoke trapped in calm air, not road dust. AQI down 11 over the last 6 hours (steady decline since this morning).
OK No precautions needed for the general population; unusually sensitive individuals may consider limiting prolonged outdoor exertion.
What's driving it
Ozone × UV × Sky
Ozone at AQI 33. Overcast through the UV peak window (cloud cover ~71%) — afternoon ozone should stay flat.
- Present
- AQI 33
- UV peak
- 3.3 at 1 PM
- Sky at peak
- overcast
- Projected peak
- AQI 7
PM × Wind × Precip
PM2.5 at 7.7 µg/m³ (AQI 43) with a 0.84 fine-to-coarse ratio and 6 mph wind — combustion smoke trapped in calm air, not road dust.
- PM2.5/PM10
- 0.84
- Wind
- light
- Recent rain
- 0h in last 6h
- Pattern
- stagnant smoke
Trends
Seven days of AQI and PM2.5.
Hourly air-quality data from the Copernicus Atmosphere Monitoring Service, charted across the past and next several days. Dashed lines mark the AQI breakpoints at 50 (Good → Moderate) and 100 (Moderate → Unhealthy for Sensitive Groups).
A summer fog for fair, a winter fog for rain.
- Moonrise
- 4:37 AM
- Moonset
- 1:50 PM
- In sign
- ♑︎ Capricorn
Fireflies rise from the lawn
Fitchburg at a glance
- Today vs. normal: 11°F below the seasonal normal for this latitude
- Last frost: May 4 (climatological average for this latitude)
- Microseason: Jun 1–5
- Planting window: Harvest spring lettuce before it bolts. Sow heat-tolerant greens.
Right now in the garden
Peak growing season
As of June 4, the growing season is at its peak — frost is months away. Continue succession-planting beans and summer squash. Start fall brassicas (broccoli, cabbage, kale) from seed indoors for transplanting in late summer.
SPC Convective Outlook
Storm Prediction Center — Fitchburg
SPC has placed Fitchburg in the Marginal Risk category for severe thunderstorms day after tomorrow.
- TODAYNONENo severe risk
- TOMORROWTSTMGeneral Thunderstorms
- DAY 3MRGLMarginal Risk
Isolated severe storms possible. Limited threat for hail or damaging wind.
Source: NOAA / NWS Storm Prediction Center categorical convective outlook. Outlooks are re-issued multiple times per day; this page reflects the most recent SPC polygons covering the city’s coordinates.
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
Fitchburg's warmest month is July (~72°F mean) and its coldest is January (~19°F). Rainfall peaks in June (5.7 inches) and bottoms out in January (1.7 inches).
| Month | Mean temp | Precip | Rainy days |
|---|---|---|---|
| January | 19° | 1.7″ | 4 |
| February | 23° | 1.7″ | 5 |
| March | 34° | 2.3″ | 5 |
| April | 47° | 4.2″ | 8 |
| May | 58° | 4.5″ | 9 |
| June | 68° | 5.7″ | 8 |
| July | 72° | 4.7″ | 7 |
| August | 70° | 4.1″ | 6 |
| September | 62° | 3.9″ | 6 |
| October | 50° | 3.0″ | 6 |
| November | 37° | 2.3″ | 5 |
| December | 25° | 1.9″ | 5 |
Regional context
Fitchburg sits within a warm-summer humid continental climate region — a cohort that shares similar temperature ranges, seasonal patterns, and growing conditions across nearby cities.
Similar climates: Milwaukee, WI, Madison, WI, Appleton, WI, Green Bay, WI, Racine, WI.
Frequently asked
- When does it freeze in Fitchburg?
- Fitchburg's last spring frost typically falls around mid-May, and the first fall frost arrives around mid-October.
- What is the rainy season in Fitchburg?
- June is the wettest month with about 5.7 inches of rain on average; the city receives roughly 40 inches annually.
- What is the warmest month in Fitchburg?
- July is typically warmest, averaging about 72°F.
- What is the coldest month in Fitchburg?
- January is typically coldest, averaging about 19°F.
- When can I start a vegetable garden in Fitchburg?
- Cool-season crops (peas, lettuce) can be sown around the last spring frost (mid-May); warm-season crops (tomatoes, peppers) wait until 1–2 weeks after.
- How many rainy days does Fitchburg get?
- Fitchburg averages about 73 rainy days per year.
- What hardiness zone is Fitchburg?
- Fitchburg's USDA hardiness zone is determined by its lowest average winter temperature; check the USDA's online lookup with the city ZIP for the current zone designation.
Climate
Fitchburg, Wisconsin sits in a warm-summer humid continental climate zone. January means hover near 19°F while July averages 72°F — a 52°F seasonal swing.
Across the year, Fitchburg receives about 40 inches of precipitation spread over roughly 73 rainy days.
The rhythm of the year is set by latitude (43.0°N), proximity to large water bodies, and elevation — all of which shape what grows here, when frost is likely, and what the weather story looks like day to day.