Brillion, Wisconsin climate: Normal weather by month, frost dates and records
Brillion's normal year runs from 10°F January nights to 82°F July afternoons, with 32.2 inches of precipitation and 43 inches of snow a year. (NOAA 1991-2020 normals)
In metric: a yearly mean of 7.3°C, January lows of −12°C, July highs of 28°C, 818 mm of precipitation a year.
- NOAA stationBrillion
- Station IDUSC00471064
- Location44.16°N 88.08°W
- Elevation810 ft (247 m)
- From the center1 miles
- Population3,318
On October 24, the normal high in Brillion is 54°F and the normal low 35°F, and the chance of measurable rain or snow is 35%.
Normals describe a typical year at the station, not a forecast. The National Weather Service forecast for Brillion.
- Jan 26° 10°
- Feb 29° 12°
- Mar 41° 22°
- Apr 54° 33°
- May 68° 45°
- Jun 77° 56°
- Jul 82° 59°
- Aug 79° 56°
- Sep 72° 49°
- Oct 58° 38°
- Nov 44° 28°
- Dec 31° 17°
Each month: normal high (large) and low, °F. Fill: the month's normal mean, colder blue to hotter red.
What is the weather like in Brillion each month?
July is the warmest month, with normal highs of 82°F; January the coldest, with normal lows of 10°F. The most precipitation falls in June (4.52 in), the least in February (1.04 in).
| Month | High | Low | Mean | Precip. | Snow | Wet days | 90°F days | Freezing nights | Daylight |
|---|---|---|---|---|---|---|---|---|---|
| January | 26°F | 10°F | 17.7°F | 1.36 | 12.2 | 9 | <1 | 30 | 9 h 10 min |
| February | 29°F | 12°F | 20.7°F | 1.04 | 9.7 | 8 | <1 | 27 | 10 h 30 min |
| March | 41°F | 22°F | 31.3°F | 1.87 | 5.6 | 8 | <1 | 26 | 11 h 50 min |
| April | 54°F | 33°F | 43.6°F | 3.01 | 2.7 | 11 | <1 | 15 | 13 h 20 min |
| May | 68°F | 45°F | 56.1°F | 3.91 | 0.0 | 12 | <1 | 2 | 14 h 40 min |
| June | 77°F | 56°F | 66.4°F | 4.52 | 0.0 | 11 | 1 | <1 | 15 h 30 min |
| July | 82°F | 59°F | 70.4°F | 3.72 | 0.0 | 11 | 3 | <1 | 15 h 10 min |
| August | 79°F | 56°F | 67.8°F | 3.28 | 0.0 | 10 | 1 | <1 | 14 h |
| September | 72°F | 49°F | 60.5°F | 3.13 | 0.0 | 10 | 1 | <1 | 12 h 40 min |
| October | 58°F | 38°F | 48.2°F | 2.81 | 0.3 | 11 | <1 | 9 | 11 h |
| November | 44°F | 28°F | 35.6°F | 2.02 | 2.2 | 9 | <1 | 21 | 9 h 40 min |
| December | 31°F | 17°F | 24.3°F | 1.55 | 10.5 | 10 | <1 | 29 | 8 h 50 min |
| Year (annual) | 55°F | 36°F | 45.2°F | 32.22 | 43.2 | 121 | 7 | 159 |
The same normals in °C and millimetres
| Month | High | Low | Mean | Precip. | Snow |
|---|---|---|---|---|---|
| January | −4°C | −12°C | −7.9°C | 35 mm | 31 cm |
| February | −1°C | −11°C | −6.3°C | 26 mm | 25 cm |
| March | 5°C | −5°C | −0.4°C | 47 mm | 14 cm |
| April | 12°C | 1°C | 6.4°C | 76 mm | 7 cm |
| May | 20°C | 7°C | 13.4°C | 99 mm | 0 cm |
| June | 25°C | 13°C | 19.1°C | 115 mm | 0 cm |
| July | 28°C | 15°C | 21.3°C | 94 mm | 0 cm |
| August | 26°C | 13°C | 19.9°C | 83 mm | 0 cm |
| September | 22°C | 9°C | 15.8°C | 80 mm | 0 cm |
| October | 15°C | 3°C | 9.0°C | 71 mm | 1 cm |
| November | 6°C | −2°C | 2.0°C | 51 mm | 6 cm |
| December | 0°C | −8°C | −4.3°C | 39 mm | 27 cm |
Source: NOAA NCEI 1991-2020 monthly normals, station USC00471064; annual normals. Wet days: 0.01 inch or more; 90°F days and freezing nights: NOAA's day counts. Daylight: sunrise to sunset on the 15th, computed from the latitude.
When is the best weather to visit Brillion?
Normal highs sit between 65°F and 85°F in May, June, July, August and September. Of those, August has the fewest days with rain (10).
That is a measurement, not a recommendation: it counts the months whose normal afternoon high sits between 65°F and 85°F, where a light layer is enough by day.
Source: NOAA NCEI 1991-2020 monthly normals, station USC00471064.
When is the last frost in Brillion?
In Brillion, the last spring frost (32°F) comes after May 6 in half of years and after May 21 in one year in ten; the first autumn frost comes before October 6 in half of years and before September 23 in one year in ten.
Frost-free in half of yearsFrost in 1 to 9 years out of 10Frost most years
- Last spring frost, half of years after
- May 61 year in 10 after May 21; 9 in 10 after April 22
- First autumn frost, half of years before
- October 61 year in 10 before September 23; 9 in 10 before October 21
NOAA puts the median frost-free season at 151 days, and the season without a hard freeze (28°F) at 175 days.
A hard freeze (28°F) comes after April 25 in half of springs and before October 18 in half of autumns.
The USDA's 2023 Plant Hardiness Zone Map puts Brillion in zone 5b in ZIP code 54110, the nearest ZIP area. By the map's own method, the average of each year's coldest night over 1991-2020, Brillion's NOAA station is in zone 5b: the coldest night of a typical year reaches −14°F (23 complete years).
Frost dates for every NOAA station in Wisconsin · Frost dates by ZIP code
Source: NOAA NCEI 1991-2020 annual normals (frost probabilities), station USC00471064; USDA 2023 Plant Hardiness Zone Map, ZIP listings: PRISM Group, Oregon State University, https://prism.oregonstate.edu, accessed October 8, 2026; the station zone: ACIS daily lows, 1991-2020. A 10% date means one year in ten has a frost after it in spring or before it in autumn.
How hot and how cold does it get in Brillion?
In a normal year in Brillion, 7 days a year reach 90°F, 159 nights fall to 32°F or colder and 121 days bring measurable precipitation.
- Days at 90°F or more
- 7a normal year
- Days at 100°F or more
- fewer than 1a normal year
- Nights at 32°F or colder
- 159a normal year
- Days that stay below freezing
- 68high of 32°F or less
- Days with 0.01 inch of precipitation
- 121a normal year
- Days with 1 inch of snow or more
- 17a normal year
The highest temperature in this station's record (since 1968) is 98°F, on July 30, 1999; the lowest is −26°F, on January 26, 2019.
The wettest calendar year on that record is 2024, with 43.94 in; the snowiest season is 1951–52, with 84.1 inches.
Source: NOAA NCEI 1991-2020 annual normals, station USC00471064; records: ACIS (NOAA Regional Climate Centers), station USC00471064. Records use complete months only; a month missing more than three days is left out.
How sunny is Brillion?
Over a year 72% of the sunlight that would reach the ground under clear skies gets through the clouds in the area around Brillion, 3.8 kWh per square metre a day. July is the sunniest month (80%) and December the cloudiest (58%).
| Month | Share of clear-sky sunshine | Sunshine, kWh/m² a day |
|---|---|---|
| January | 65% | 1.6 |
| February | 72% | 2.7 |
| March | 72% | 3.8 |
| April | 68% | 4.6 |
| May | 71% | 5.6 |
| June | 74% | 6.1 |
| July | 80% | 6.3 |
| August | 77% | 5.3 |
| September | 76% | 4.1 |
| October | 68% | 2.6 |
| November | 65% | 1.7 |
| December | 58% | 1.2 |
Source: NASA POWER solar climatology, 2001-2020 (CERES SYN1deg). Satellite-based, for the 1-degree cell (about 100 km across) around the station, so it describes the area rather than the airport.
How much heating and cooling does Brillion need?
A normal year in Brillion brings 7,667 heating degree days, 43% more than the median U.S. place (5,373), and 491 cooling degree days, 46% fewer than the median (908). Seven months need 300 or more heating degree days, a monthly mean of about 55°F or colder. For gardens and crops, NOAA counts 2,374 growing degree days a year above 50°F.
| Month | Heating | Cooling |
|---|---|---|
| January | 1,466 | 0 |
| February | 1,239 | 0 |
| March | 1,045 | 0 |
| April | 643 | 1 |
| May | 298 | 24 |
| June | 69 | 110 |
| July | 20 | 186 |
| August | 36 | 121 |
| September | 180 | 45 |
| October | 527 | 5 |
| November | 881 | 0 |
| December | 1,263 | 0 |
| Year (annual) | 7,667 | 491 |
Source: NOAA NCEI 1991-2020 monthly normals, station USC00471064. A degree day is one degree of a day's mean temperature below 65°F (heating) or above it (cooling); utilities use them to estimate energy use.
Has Brillion been warmer than normal lately?
2025 averaged 45.3°F, 0.1°F above the 1991-2020 normal of 45.2°F. 4 of the 5 complete years since 2021 ran warmer than the normal.
| Year | Mean | Against normal | Precip. | Snow |
|---|---|---|---|---|
| 2021 | 46.8°F | +1.6°F | 34.81 | 27.3 |
| 2022 | 44.2°F | −1.0°F | 34.27 | 29.5 |
| 2023 | 47.1°F | +1.9°F | 28.52 | 54.0 |
| 2024 | 48.3°F | +3.1°F | 43.94 | 35.5 |
| 2025 | 45.3°F | +0.1°F | 29.08 | 44.5 |
Source: observed years: ACIS, station USC00471064. A year counts only with all twelve months complete.
How does Brillion's climate compare?
Brillion is warmer than 87 of the other 164 places with their own NOAA record in Wisconsin, and wetter than 30. Across the 7,247 U.S. stations with normals, its annual mean of 45.2°F is warmer than 20%.
In the Köppen classification computed from these normals, Brillion is Dfb: continental, no dry season, warm summer. What the classes mean.
Places with the most similar year elsewhere
Measured month by month on the normal high, low and precipitation, among places of 20,000 or more people in other states:
Source: NOAA NCEI 1991-2020 normals for every station PlainClimate covers. Similarity: the root-mean-square difference of the 36 monthly figures, precipitation weighted so an inch counts like 6°F.
Which places near Brillion share this climate record?
8 places have no NOAA station with 1991-2020 normals of their own, and this station is the nearest full record. A place's own climate can differ from these figures, by several degrees where it sits much higher or lower than the station, nearer the coast, or inside a large city's heat; for the larger places the next nearest records are named with their yearly mean, so the spread around them is visible, and places of 50,000 or more have their own page with NOAA's gridded normals.
- Sherwood, WI3,282 people · 10 mi W
- Hilbert, WI1,217 people · 4 mi W
- Reedsville, WI1,193 people · 6 mi E
- Valders, WI956 people · 12 mi SE
- Greenleaf, WI921 people · 11 mi N
- Forest Junction, WI655 people · 5 mi NW
- Potter, WI232 people · 3 mi S
- Collins, WI211 people · 7 mi SE
Source: Census Bureau 2024 Gazetteer (place centers) and Vintage 2024 population estimates. Distance and direction from the station to each place's center.
Questions about Brillion's climate
What is the coldest month in Brillion?
January, with a normal high of 26°F and a normal low of 10°F. The warmest is July (82°F by day, 59°F at night).
Does it snow in Brillion?
Yes: 43 inches in a normal year, falling on 24 days with 0.1 inch or more, the most in January (12.2 inches).
What is the rainiest month in Brillion?
June, with 4.52 in of precipitation in a normal year; the driest is February with 1.04 in.
What plant hardiness zone is Brillion in?
The USDA's 2023 map puts Brillion in zone 5b in ZIP code 54110, the nearest ZIP area. By the same method at Brillion's NOAA station, the coldest night of a typical year reaches −14°F (23 years, 1991-2020): zone 5b.
How late can frost come in Brillion?
In half of years the last 32°F night comes after May 6; in one year in ten it comes after May 21. Waiting until May 21 leaves about a one-in-ten chance of a later frost.
Nearby and next
- Wisconsin climateThe statewide normals and every place in the state
- Chilton, WI9 miles from this station, 45.7°F a year
- Denmark, WI19 miles from this station, 44.7°F a year
- Appleton, WI19 miles from this station, 45.6°F a year
- Manitowoc, WI22 miles from this station, 45.1°F a year
- Compare two placesMonth by month, side by side
Download these normals (CSV) · JSON · How these figures are made