Clam Lake, Wisconsin climate: Normal weather by month, frost dates and records
Clam Lake's normal year runs from 1°F January nights to 76°F July afternoons, with 33.9 inches of precipitation a year. (NOAA 1991-2020 normals)
In metric: a yearly mean of 4.2°C, January lows of −17°C, July highs of 25°C, 862 mm of precipitation a year.
- NOAA stationClam Lake (4 mi W)
- Station IDUSC00471604
- Location46.17°N 90.98°W
- Elevation1,498 ft (457 m)
- Population (census place)47
On October 23, the normal high in Clam Lake is 49°F and the normal low 31°F, and the chance of measurable rain or snow is 43%.
Normals describe a typical year at the station, not a forecast. The National Weather Service forecast for Clam Lake.
- Jan 20° 1°
- Feb 25° 1°
- Mar 36° 13°
- Apr 49° 27°
- May 63° 40°
- Jun 73° 51°
- Jul 76° 56°
- Aug 75° 54°
- Sep 67° 46°
- Oct 53° 34°
- Nov 37° 22°
- Dec 25° 8°
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 Clam Lake each month?
July is the warmest month, with normal highs of 76°F; January the coldest, with normal lows of 1°F. The most precipitation falls in August (4.27 in), the least in February (0.94 in).
| Month | High | Low | Mean | Precip. | Wet days | 90°F days | Freezing nights | Daylight |
|---|---|---|---|---|---|---|---|---|
| January | 20°F | 1°F | 10.1°F | 0.99 | 11 | <1 | 31 | 9 h |
| February | 25°F | 1°F | 12.9°F | 0.94 | 9 | <1 | 28 | 10 h 20 min |
| March | 36°F | 13°F | 24.6°F | 1.91 | 9 | <1 | 29 | 11 h 50 min |
| April | 49°F | 27°F | 38.3°F | 3.12 | 13 | <1 | 24 | 13 h 30 min |
| May | 63°F | 40°F | 51.7°F | 4.08 | 13 | <1 | 7 | 15 h |
| June | 73°F | 51°F | 61.9°F | 4.19 | 14 | <1 | <1 | 15 h 40 min |
| July | 76°F | 56°F | 66.2°F | 3.96 | 12 | <1 | <1 | 15 h 30 min |
| August | 75°F | 54°F | 64.1°F | 4.27 | 13 | <1 | <1 | 14 h 10 min |
| September | 67°F | 46°F | 56.3°F | 3.64 | 13 | <1 | 2 | 12 h 40 min |
| October | 53°F | 34°F | 43.1°F | 3.37 | 14 | <1 | 14 | 11 h |
| November | 37°F | 22°F | 29.5°F | 2.01 | 11 | <1 | 26 | 9 h 30 min |
| December | 25°F | 8°F | 16.6°F | 1.44 | 13 | <1 | 31 | 8 h 40 min |
| Year (annual) | 50°F | 29°F | 39.6°F | 33.92 | 145 | 1 | 190 |
The same normals in °C and millimetres
| Month | High | Low | Mean | Precip. |
|---|---|---|---|---|
| January | −7°C | −17°C | −12.2°C | 25 mm |
| February | −4°C | −17°C | −10.6°C | 24 mm |
| March | 2°C | −11°C | −4.1°C | 49 mm |
| April | 10°C | −3°C | 3.5°C | 79 mm |
| May | 17°C | 5°C | 10.9°C | 104 mm |
| June | 23°C | 11°C | 16.6°C | 106 mm |
| July | 25°C | 13°C | 19.0°C | 101 mm |
| August | 24°C | 12°C | 17.8°C | 108 mm |
| September | 19°C | 8°C | 13.5°C | 92 mm |
| October | 11°C | 1°C | 6.2°C | 86 mm |
| November | 3°C | −6°C | −1.4°C | 51 mm |
| December | −4°C | −13°C | −8.6°C | 37 mm |
NOAA publishes no 1991-2020 snowfall normal for this station. The nearest record that keeps one, Drummond (18 miles away), gets 74 inches of snow in a normal year; elevation and distance can change that.
Source: NOAA NCEI 1991-2020 monthly normals, station USC00471604; 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 Clam Lake?
Normal highs sit between 65°F and 85°F in June, July, August and September. Of those, July has the fewest days with rain (12).
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 USC00471604.
When is the last frost in Clam Lake?
In Clam Lake, the last spring frost (32°F) comes after May 16 in half of years and after May 27 in one year in ten; the first autumn frost comes before September 30 in half of years and before September 17 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 161 year in 10 after May 27; 9 in 10 after May 1
- First autumn frost, half of years before
- September 301 year in 10 before September 17; 9 in 10 before October 12
NOAA puts the median frost-free season at 136 days, and the season without a hard freeze (28°F) at 157 days.
A hard freeze (28°F) comes after May 3 in half of springs and before October 10 in half of autumns.
The USDA's 2023 Plant Hardiness Zone Map puts Clam Lake in zone 4a in ZIP code 54517, the nearest ZIP area.
Frost dates for every NOAA station in Wisconsin · Frost dates by ZIP code
Source: NOAA NCEI 1991-2020 annual normals (frost probabilities), station USC00471604; USDA 2023 Plant Hardiness Zone Map, ZIP listings: PRISM Group, Oregon State University, https://prism.oregonstate.edu, accessed October 8, 2026. 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 Clam Lake?
In a normal year in Clam Lake, 1 day a year reaches 90°F, 190 nights fall to 32°F or colder and 145 days bring measurable precipitation.
- Days at 90°F or more
- 1a normal year
- Days at 100°F or more
- fewer than 1a normal year
- Nights at 32°F or colder
- 190a normal year
- Days that stay below freezing
- 99high of 32°F or less
- Days with 0.01 inch of precipitation
- 145a normal year
Source: NOAA NCEI 1991-2020 annual normals, station USC00471604.
How sunny is Clam Lake?
Over a year 69% of the sunlight that would reach the ground under clear skies gets through the clouds in the area around Clam Lake, 3.6 kWh per square metre a day. July is the sunniest month (78%) and December the cloudiest (52%).
| Month | Share of clear-sky sunshine | Sunshine, kWh/m² a day |
|---|---|---|
| January | 59% | 1.3 |
| February | 66% | 2.3 |
| March | 68% | 3.5 |
| April | 67% | 4.5 |
| May | 68% | 5.3 |
| June | 72% | 5.9 |
| July | 78% | 6.2 |
| August | 76% | 5.1 |
| September | 72% | 3.8 |
| October | 63% | 2.4 |
| November | 58% | 1.4 |
| December | 52% | 1.0 |
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 Clam Lake need?
A normal year in Clam Lake brings 9,412 heating degree days, 75% more than the median U.S. place (5,373), and 201 cooling degree days, 78% fewer than the median (908). Eight months need 300 or more heating degree days, a monthly mean of about 55°F or colder. For gardens and crops, NOAA counts 1,724 growing degree days a year above 50°F.
| Month | Heating | Cooling |
|---|---|---|
| January | 1,700 | 0 |
| February | 1,457 | 0 |
| March | 1,252 | 0 |
| April | 801 | 0 |
| May | 418 | 6 |
| June | 126 | 35 |
| July | 50 | 87 |
| August | 84 | 56 |
| September | 278 | 17 |
| October | 679 | 1 |
| November | 1,064 | 0 |
| December | 1,502 | 0 |
| Year (annual) | 9,412 | 201 |
Source: NOAA NCEI 1991-2020 monthly normals, station USC00471604. 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 Clam Lake been warmer than normal lately?
2025 averaged 40.2°F, 0.6°F above the 1991-2020 normal of 39.6°F. 4 of the 5 complete years since 2021 ran warmer than the normal.
| Year | Mean | Against normal | Precip. |
|---|---|---|---|
| 2021 | 41.4°F | +1.8°F | 32.03 |
| 2022 | 38.0°F | −1.6°F | 31.50 |
| 2023 | 41.6°F | +2.0°F | 37.89 |
| 2024 | 43.4°F | +3.8°F | 33.42 |
| 2025 | 40.2°F | +0.6°F | 27.79 |
Source: observed years: ACIS, station USC00471604. A year counts only with all twelve months complete.
How does Clam Lake's climate compare?
Clam Lake is warmer than 1 of the other 164 places with their own NOAA record in Wisconsin, and wetter than 60. Across the 7,247 U.S. stations with normals, its annual mean of 39.6°F is warmer than 5%.
In the Köppen classification computed from these normals, Clam Lake 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.
Questions about Clam Lake's climate
What is the coldest month in Clam Lake?
January, with a normal high of 20°F and a normal low of 1°F. The warmest is July (76°F by day, 56°F at night).
Does it snow in Clam Lake?
Yes. NOAA publishes no 1991-2020 snowfall normal for Clam Lake's NOAA station; the nearest record that keeps one, Drummond (18 miles away), records 74 inches of snow in a normal year.
What is the rainiest month in Clam Lake?
August, with 4.27 in of precipitation in a normal year; the driest is February with 0.94 in.
What plant hardiness zone is Clam Lake in?
The USDA's 2023 map puts Clam Lake in zone 4a in ZIP code 54517, the nearest ZIP area.
How late can frost come in Clam Lake?
In half of years the last 32°F night comes after May 16; in one year in ten it comes after May 27. Waiting until May 27 leaves about a one-in-ten chance of a later frost.
Nearby and next
- Wisconsin climateThe statewide normals and every place in the state
- Drummond, WI18 miles from this station, 40.6°F a year
- Mellen, WI21 miles from this station, 40.4°F a year
- Hayward, WI24 miles from this station, 41.5°F a year
- Butternut, WI25 miles from this station, 39.7°F a year
- Compare two placesMonth by month, side by side
Download these normals (CSV) · JSON · How these figures are made