Bloomer, Wisconsin climate: Normal weather by month, frost dates and records
Bloomer's normal year runs from 3°F January nights to 81°F July afternoons, with 31.9 inches of precipitation and 42 inches of snow a year. (NOAA 1991-2020 normals)
In metric: a yearly mean of 6.3°C, January lows of −16°C, July highs of 27°C, 811 mm of precipitation a year.
- NOAA stationBloomer
- Station IDUSC00470904
- Location45.09°N 91.49°W
- Elevation990 ft (302 m)
- From the centerunder 1 mile
- Population3,646
On October 12, the normal high in Bloomer is 59°F and the normal low 37°F, and the chance of measurable rain or snow is 33%.
Normals describe a typical year at the station, not a forecast. The National Weather Service forecast for Bloomer.
- Jan 21° 3°
- Feb 26° 7°
- Mar 39° 19°
- Apr 54° 33°
- May 68° 45°
- Jun 77° 56°
- Jul 81° 60°
- Aug 79° 57°
- Sep 71° 48°
- Oct 56° 36°
- Nov 40° 24°
- Dec 27° 11°
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 Bloomer each month?
July is the warmest month, with normal highs of 81°F; January the coldest, with normal lows of 3°F. The most precipitation falls in June (4.51 in), the least in February (0.94 in).
| Month | High | Low | Mean | Precip. | Snow | Wet days | 90°F days | Freezing nights | Daylight |
|---|---|---|---|---|---|---|---|---|---|
| January | 21°F | 3°F | 12.4°F | 1.00 | 9.3 | 8 | <1 | 31 | 9 h 10 min |
| February | 26°F | 7°F | 16.4°F | 0.94 | 9.9 | 6 | <1 | 27 | 10 h 20 min |
| March | 39°F | 19°F | 29.2°F | 1.58 | 7.2 | 8 | <1 | 27 | 11 h 50 min |
| April | 54°F | 33°F | 43.5°F | 2.93 | 2.4 | 11 | <1 | 15 | 13 h 30 min |
| May | 68°F | 45°F | 56.5°F | 3.73 | 0.3 | 12 | 1 | 2 | 14 h 50 min |
| June | 77°F | 56°F | 66.4°F | 4.51 | 0.0 | 12 | 2 | <1 | 15 h 40 min |
| July | 81°F | 60°F | 70.5°F | 4.14 | 0.0 | 10 | 4 | <1 | 15 h 20 min |
| August | 79°F | 57°F | 68.1°F | 3.98 | 0.0 | 9 | 2 | <1 | 14 h 10 min |
| September | 71°F | 48°F | 59.7°F | 3.32 | 0.0 | 10 | <1 | 1 | 12 h 40 min |
| October | 56°F | 36°F | 46.0°F | 2.82 | 0.6 | 10 | <1 | 12 | 11 h |
| November | 40°F | 24°F | 32.1°F | 1.74 | 2.6 | 7 | <1 | 25 | 9 h 40 min |
| December | 27°F | 11°F | 19.1°F | 1.22 | 9.5 | 9 | <1 | 30 | 8 h 50 min |
| Year (annual) | 53°F | 33°F | 43.3°F | 31.91 | 41.8 | 113 | 8 | 170 |
The same normals in °C and millimetres
| Month | High | Low | Mean | Precip. | Snow |
|---|---|---|---|---|---|
| January | −6°C | −16°C | −10.9°C | 25 mm | 24 cm |
| February | −3°C | −14°C | −8.7°C | 24 mm | 25 cm |
| March | 4°C | −7°C | −1.6°C | 40 mm | 18 cm |
| April | 12°C | 0°C | 6.4°C | 74 mm | 6 cm |
| May | 20°C | 7°C | 13.6°C | 95 mm | 1 cm |
| June | 25°C | 13°C | 19.1°C | 115 mm | 0 cm |
| July | 27°C | 15°C | 21.4°C | 105 mm | 0 cm |
| August | 26°C | 14°C | 20.1°C | 101 mm | 0 cm |
| September | 22°C | 9°C | 15.4°C | 84 mm | 0 cm |
| October | 14°C | 2°C | 7.8°C | 72 mm | 2 cm |
| November | 5°C | −5°C | 0.1°C | 44 mm | 7 cm |
| December | −3°C | −12°C | −7.2°C | 31 mm | 24 cm |
Source: NOAA NCEI 1991-2020 monthly normals, station USC00470904; 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 Bloomer?
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 (9).
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 USC00470904.
When is the last frost in Bloomer?
In Bloomer, the last spring frost (32°F) comes after May 5 in half of years and after May 19 in one year in ten; the first autumn frost comes before October 3 in half of years and before September 20 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 51 year in 10 after May 19; 9 in 10 after April 23
- First autumn frost, half of years before
- October 31 year in 10 before September 20; 9 in 10 before October 17
NOAA puts the median frost-free season at 151 days, and the season without a hard freeze (28°F) at 171 days.
A hard freeze (28°F) comes after April 26 in half of springs and before October 15 in half of autumns.
The USDA's 2023 Plant Hardiness Zone Map puts Bloomer in zone 4b in ZIP code 54724, the nearest ZIP area. By the map's own method, the average of each year's coldest night over 1991-2020, Bloomer's NOAA station is in zone 4b: the coldest night of a typical year reaches −22°F (30 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 USC00470904; 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 Bloomer?
In a normal year in Bloomer, 8 days a year reach 90°F, 170 nights fall to 32°F or colder and 113 days bring measurable precipitation.
- Days at 90°F or more
- 8a normal year
- Days at 100°F or more
- fewer than 1a normal year
- Nights at 32°F or colder
- 170a normal year
- Days that stay below freezing
- 80high of 32°F or less
- Days with 0.01 inch of precipitation
- 113a normal year
- Days with 1 inch of snow or more
- 18a normal year
The highest temperature in this station's record (since 1944) is 104°F, on August 2, 1988; the lowest is −43°F, on January 9, 1977.
The wettest calendar year on that record is 1990, with 44.62 in; the snowiest season is 1985–86, with 75.0 inches.
Source: NOAA NCEI 1991-2020 annual normals, station USC00470904; records: ACIS (NOAA Regional Climate Centers), station USC00470904. Records use complete months only; a month missing more than three days is left out.
How sunny is Bloomer?
Over a year 72% of the sunlight that would reach the ground under clear skies gets through the clouds in the area around Bloomer, 3.7 kWh per square metre a day. July is the sunniest month (78%) and December the cloudiest (57%).
| Month | Share of clear-sky sunshine | Sunshine, kWh/m² a day |
|---|---|---|
| January | 70% | 1.7 |
| February | 76% | 2.8 |
| March | 73% | 3.9 |
| April | 68% | 4.6 |
| May | 68% | 5.4 |
| June | 73% | 6.0 |
| July | 78% | 6.2 |
| August | 76% | 5.2 |
| September | 74% | 4.0 |
| October | 66% | 2.5 |
| November | 62% | 1.6 |
| December | 57% | 1.1 |
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 Bloomer need?
A normal year in Bloomer brings 8,356 heating degree days, 56% more than the median U.S. place (5,373), and 497 cooling degree days, 45% 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 2,357 growing degree days a year above 50°F.
| Month | Heating | Cooling |
|---|---|---|
| January | 1,632 | 0 |
| February | 1,359 | 0 |
| March | 1,108 | 0 |
| April | 648 | 2 |
| May | 287 | 25 |
| June | 67 | 109 |
| July | 17 | 187 |
| August | 36 | 130 |
| September | 201 | 42 |
| October | 591 | 2 |
| November | 987 | 0 |
| December | 1,423 | 0 |
| Year (annual) | 8,356 | 497 |
Source: NOAA NCEI 1991-2020 monthly normals, station USC00470904. 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 Bloomer been warmer than normal lately?
2025 averaged 44.0°F, 0.7°F above the 1991-2020 normal of 43.3°F. 4 of the 5 complete years since 2021 ran warmer than the normal.
| Year | Mean | Against normal | Precip. | Snow |
|---|---|---|---|---|
| 2021 | 45.5°F | +2.2°F | 32.07 | 31.1 |
| 2022 | 41.6°F | −1.7°F | 33.30 | 28.4 |
| 2023 | 45.6°F | +2.3°F | 31.76 | 45.8 |
| 2024 | 47.3°F | +4.0°F | 33.36 | 22.7 |
| 2025 | 44.0°F | +0.7°F | 28.13 | 34.0 |
Over 60 complete years from 1948 to 2025, the station's annual mean temperature rose at a fitted 4.4°F per century (+0.24°C per decade). A fitted rate summarizes the whole record; single years swing well above and below it.
Source: observed years: ACIS, station USC00470904; trend: NOAA GHCN-Monthly v4. A year counts only with all twelve months complete.
How does Bloomer's climate compare?
Bloomer is warmer than 41 of the other 164 places with their own NOAA record in Wisconsin, and wetter than 26. Across the 7,247 U.S. stations with normals, its annual mean of 43.3°F is warmer than 13%.
In the Köppen classification computed from these normals, Bloomer 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 Bloomer share this climate record?
2 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.
- Colfax, WI1,204 people · 13 mi SW
- New Auburn, WI562 people · 8 mi NW
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 Bloomer's climate
What is the coldest month in Bloomer?
January, with a normal high of 21°F and a normal low of 3°F. The warmest is July (81°F by day, 60°F at night).
Does it snow in Bloomer?
Yes: 42 inches in a normal year, falling on 20 days with 0.1 inch or more, the most in February (9.9 inches).
What is the rainiest month in Bloomer?
June, with 4.51 in of precipitation in a normal year; the driest is February with 0.94 in.
What plant hardiness zone is Bloomer in?
The USDA's 2023 map puts Bloomer in zone 4b in ZIP code 54724, the nearest ZIP area. By the same method at Bloomer's NOAA station, the coldest night of a typical year reaches −22°F (30 years, 1991-2020): zone 4b.
How late can frost come in Bloomer?
In half of years the last 32°F night comes after May 5; in one year in ten it comes after May 19. Waiting until May 19 leaves about a one-in-ten chance of a later frost.
Nearby and next
- Wisconsin climateThe statewide normals and every place in the state
- Jim Falls, WI7 miles from this station, 44.3°F a year
- Eau Claire, WI16 miles from this station, 44.7°F a year
- Holcombe, WI20 miles from this station, 42.7°F a year
- Ridgeland, WI21 miles from this station, 42.4°F a year
- Compare two placesMonth by month, side by side
Download these normals (CSV) · JSON · How these figures are made