Trempealeau, Wisconsin climate: Normal weather by month, frost dates and records
Trempealeau's normal year runs from 9°F January nights to 82°F July afternoons, with 34.7 inches of precipitation and 36 inches of snow a year. (NOAA 1991-2020 normals)
In metric: a yearly mean of 8.1°C, January lows of −13°C, July highs of 28°C, 882 mm of precipitation a year.
- NOAA stationTrempealeau Dam 6
- Station IDUSC00478589
- Location44.00°N 91.44°W
- Elevation660 ft (201 m)
- Population1,856
On October 14, the normal high in Trempealeau is 60°F and the normal low 41°F, and the chance of measurable rain or snow is 30%.
Normals describe a typical year at the station, not a forecast. The National Weather Service forecast for Trempealeau.
- Jan 25° 9°
- Feb 30° 12°
- Mar 43° 24°
- Apr 57° 37°
- May 69° 48°
- Jun 78° 59°
- Jul 82° 63°
- Aug 80° 61°
- Sep 72° 53°
- Oct 59° 40°
- Nov 43° 28°
- Dec 30° 16°
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 Trempealeau each month?
July is the warmest month, with normal highs of 82°F; January the coldest, with normal lows of 9°F. The most precipitation falls in July (4.63 in), the least in January (1.12 in).
| Month | High | Low | Mean | Precip. | Snow | Wet days | 90°F days | Freezing nights | Daylight |
|---|---|---|---|---|---|---|---|---|---|
| January | 25°F | 9°F | 16.9°F | 1.12 | 7.4 | 7 | <1 | 30 | 9 h 10 min |
| February | 30°F | 12°F | 21.1°F | 1.14 | 10.1 | 6 | <1 | 26 | 10 h 30 min |
| March | 43°F | 24°F | 33.4°F | 1.84 | 5.8 | 8 | <1 | 23 | 11 h 50 min |
| April | 57°F | 37°F | 46.9°F | 3.68 | 1.7 | 11 | <1 | 9 | 13 h 20 min |
| May | 69°F | 48°F | 58.8°F | 4.44 | 0.1 | 12 | <1 | 1 | 14 h 40 min |
| June | 78°F | 59°F | 68.4°F | 4.31 | 0.0 | 12 | 2 | <1 | 15 h 30 min |
| July | 82°F | 63°F | 72.4°F | 4.63 | 0.0 | 11 | 3 | <1 | 15 h 10 min |
| August | 80°F | 61°F | 70.2°F | 4.09 | 0.0 | 10 | 2 | <1 | 14 h |
| September | 72°F | 53°F | 62.5°F | 3.78 | 0.0 | 9 | <1 | <1 | 12 h 40 min |
| October | 59°F | 40°F | 49.7°F | 2.59 | 0.0 | 9 | <1 | 5 | 11 h 10 min |
| November | 43°F | 28°F | 35.6°F | 1.76 | 2.3 | 7 | <1 | 19 | 9 h 40 min |
| December | 30°F | 16°F | 23.0°F | 1.33 | 8.8 | 8 | <1 | 29 | 9 h |
| Year (annual) | 56°F | 37°F | 46.6°F | 34.71 | 36.2 | 110 | 8 | 141 |
The same normals in °C and millimetres
| Month | High | Low | Mean | Precip. | Snow |
|---|---|---|---|---|---|
| January | −4°C | −13°C | −8.4°C | 28 mm | 19 cm |
| February | −1°C | −11°C | −6.1°C | 29 mm | 26 cm |
| March | 6°C | −4°C | 0.8°C | 47 mm | 15 cm |
| April | 14°C | 3°C | 8.3°C | 93 mm | 4 cm |
| May | 21°C | 9°C | 14.9°C | 113 mm | 0 cm |
| June | 26°C | 15°C | 20.2°C | 109 mm | 0 cm |
| July | 28°C | 17°C | 22.4°C | 118 mm | 0 cm |
| August | 27°C | 16°C | 21.2°C | 104 mm | 0 cm |
| September | 22°C | 11°C | 16.9°C | 96 mm | 0 cm |
| October | 15°C | 5°C | 9.8°C | 66 mm | 0 cm |
| November | 6°C | −2°C | 2.0°C | 45 mm | 6 cm |
| December | −1°C | −9°C | −5.0°C | 34 mm | 22 cm |
Source: NOAA NCEI 1991-2020 monthly normals, station USC00478589; 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 Trempealeau?
Normal highs sit between 65°F and 85°F in May, June, July, August and September. Of those, September 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 USC00478589.
When is the last frost in Trempealeau?
In Trempealeau, the last spring frost (32°F) comes after April 29 in half of years and after May 13 in one year in ten; the first autumn frost comes before October 11 in half of years and before September 26 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
- April 291 year in 10 after May 13; 9 in 10 after April 11
- First autumn frost, half of years before
- October 111 year in 10 before September 26; 9 in 10 before October 26
NOAA puts the median frost-free season at 165 days, and the season without a hard freeze (28°F) at 188 days.
A hard freeze (28°F) comes after April 17 in half of springs and before October 23 in half of autumns.
The USDA's 2023 Plant Hardiness Zone Map puts Trempealeau in zone 5a in ZIP code 54661, the nearest ZIP area. By the map's own method, the average of each year's coldest night over 1991-2020, Trempealeau's NOAA station is in zone 5a: the coldest night of a typical year reaches −19°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 USC00478589; 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 Trempealeau?
In a normal year in Trempealeau, 8 days a year reach 90°F, 141 nights fall to 32°F or colder and 110 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
- 141a normal year
- Days that stay below freezing
- 61high of 32°F or less
- Days with 0.01 inch of precipitation
- 110a normal year
- Days with 1 inch of snow or more
- 13a normal year
The highest temperature in this station's record (since 1937) is 109°F, on July 9, 1937; the lowest is −44°F, on January 30, 1951.
The wettest calendar year on that record is 2019, with 49.13 in; the snowiest season is 1951–52, with 71.9 inches.
Source: NOAA NCEI 1991-2020 annual normals, station USC00478589; records: ACIS (NOAA Regional Climate Centers), station USC00478589. Records use complete months only; a month missing more than three days is left out.
How sunny is Trempealeau?
Over a year 73% of the sunlight that would reach the ground under clear skies gets through the clouds in the area around Trempealeau, 3.9 kWh per square metre a day. July is the sunniest month (80%) and December the cloudiest (62%).
| Month | Share of clear-sky sunshine | Sunshine, kWh/m² a day |
|---|---|---|
| January | 69% | 1.8 |
| February | 75% | 2.9 |
| March | 71% | 3.8 |
| April | 67% | 4.6 |
| May | 70% | 5.5 |
| June | 74% | 6.1 |
| July | 80% | 6.3 |
| August | 78% | 5.3 |
| September | 77% | 4.2 |
| October | 69% | 2.8 |
| November | 67% | 1.9 |
| December | 62% | 1.4 |
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 Trempealeau need?
A normal year in Trempealeau brings 7,328 heating degree days, 36% more than the median U.S. place (5,373), and 657 cooling degree days, 28% 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 2,751 growing degree days a year above 50°F.
| Month | Heating | Cooling |
|---|---|---|
| January | 1,489 | 0 |
| February | 1,228 | 0 |
| March | 980 | 0 |
| April | 545 | 3 |
| May | 226 | 35 |
| June | 37 | 139 |
| July | 6 | 234 |
| August | 16 | 177 |
| September | 137 | 62 |
| October | 478 | 5 |
| November | 884 | 0 |
| December | 1,302 | 0 |
| Year (annual) | 7,328 | 657 |
Source: NOAA NCEI 1991-2020 monthly normals, station USC00478589. 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 Trempealeau been warmer than normal lately?
2025 averaged 48.0°F, 1.4°F above the 1991-2020 normal of 46.6°F. 2 of the 3 complete years since 2021 ran warmer than the normal.
| Year | Mean | Against normal | Precip. | Snow |
|---|---|---|---|---|
| 2021 | 48.7°F | +2.1°F | 36.52 | 28.9 |
| 2022 | 45.4°F | −1.2°F | 36.12 | 23.7 |
| 2025 | 48.0°F | +1.4°F | 38.98 | 26.6 |
Over 62 complete years from 1950 to 2025, the station's annual mean temperature rose at a fitted 4.5°F per century (+0.25°C per decade). A fitted rate summarizes the whole record; single years swing well above and below it.
Source: observed years: ACIS, station USC00478589; trend: NOAA GHCN-Monthly v4. A year counts only with all twelve months complete.
How does Trempealeau's climate compare?
Trempealeau is warmer than 123 of the other 164 places with their own NOAA record in Wisconsin, and wetter than 81. Across the 7,247 U.S. stations with normals, its annual mean of 46.6°F is warmer than 26%.
In the Köppen classification computed from these normals, Trempealeau is Dfa: continental, no dry season, hot 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 Trempealeau 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.
- Homer, MN189 people · 6 mi W
- Pickwick, MN153 people · 3 mi SW
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 Trempealeau's climate
What is the coldest month in Trempealeau?
January, with a normal high of 25°F and a normal low of 9°F. The warmest is July (82°F by day, 63°F at night).
Does it snow in Trempealeau?
Yes: 36 inches in a normal year, falling on 18 days with 0.1 inch or more, the most in February (10.1 inches).
What is the rainiest month in Trempealeau?
July, with 4.63 in of precipitation in a normal year; the driest is January with 1.12 in.
What plant hardiness zone is Trempealeau in?
The USDA's 2023 map puts Trempealeau in zone 5a in ZIP code 54661, the nearest ZIP area. By the same method at Trempealeau's NOAA station, the coldest night of a typical year reaches −19°F (30 years, 1991-2020): zone 5a.
How late can frost come in Trempealeau?
In half of years the last 32°F night comes after April 29; in one year in ten it comes after May 13. Waiting until May 13 leaves about a one-in-ten chance of a later frost.
Nearby and next
- Wisconsin climateThe statewide normals and every place in the state
- Winona, MN11 miles from this station, 48.8°F a year
- Dodge, WI11 miles from this station, 46.8°F a year
- La Crescent, MN11 miles from this station, 48.1°F a year
- La Crosse, WI12 miles from this station, 48.9°F a year
- Compare two placesMonth by month, side by side
Download these normals (CSV) · JSON · How these figures are made