St Germain, Wisconsin climate: Climate normals at a NOAA weather station
St Germain's normal year runs from 1°F January nights to 75°F July afternoons, with 33.6 inches of precipitation and 74 inches of snow a year. (NOAA 1991-2020 normals)
In metric: a yearly mean of 4.2°C, January lows of −17°C, July highs of 24°C, 853 mm of precipitation a year.
- NOAA stationSt Germain
- Station IDUSC00477480
- Location45.92°N 89.49°W
- Elevation1,643 ft (501 m)
On October 23, the normal high in St Germain is 49°F and the normal low 31°F, and the chance of measurable rain or snow is 34%.
Normals describe a typical year at the station, not a forecast. The National Weather Service forecast for St Germain.
- Jan 20° 1°
- Feb 25° 2°
- Mar 36° 13°
- Apr 49° 26°
- May 63° 40°
- Jun 72° 51°
- Jul 75° 56°
- Aug 73° 55°
- Sep 66° 47°
- Oct 52° 34°
- Nov 37° 22°
- Dec 25° 9°
Each month: normal high (large) and low, °F. Fill: the month's normal mean, colder blue to hotter red.
What is the weather like at St Germain each month?
July is the warmest month, with normal highs of 75°F; January the coldest, with normal lows of 1°F. The most precipitation falls in July (4.30 in), the least in February (1.19 in).
| Month | High | Low | Mean | Precip. | Snow | Wet days | 90°F days | Freezing nights | Daylight |
|---|---|---|---|---|---|---|---|---|---|
| January | 20°F | 1°F | 10.2°F | 1.39 | 15.2 | 9 | <1 | 31 | 9 h |
| February | 25°F | 2°F | 13.2°F | 1.19 | 14.6 | 7 | <1 | 28 | 10 h 20 min |
| March | 36°F | 13°F | 24.7°F | 1.78 | 11.7 | 7 | <1 | 29 | 11 h 50 min |
| April | 49°F | 26°F | 37.5°F | 2.82 | 8.2 | 11 | <1 | 23 | 13 h 30 min |
| May | 63°F | 40°F | 51.3°F | 3.79 | 0.1 | 12 | <1 | 6 | 14 h 50 min |
| June | 72°F | 51°F | 61.9°F | 4.15 | 0.0 | 12 | <1 | <1 | 15 h 40 min |
| July | 75°F | 56°F | 65.9°F | 4.30 | 0.0 | 12 | 1 | <1 | 15 h 30 min |
| August | 73°F | 55°F | 64.0°F | 3.34 | 0.0 | 10 | <1 | <1 | 14 h 10 min |
| September | 66°F | 47°F | 56.3°F | 3.81 | 0.0 | 12 | <1 | 1 | 12 h 40 min |
| October | 52°F | 34°F | 42.8°F | 3.44 | 1.8 | 11 | <1 | 15 | 11 h |
| November | 37°F | 22°F | 29.3°F | 1.95 | 8.6 | 10 | <1 | 27 | 9 h 30 min |
| December | 25°F | 9°F | 17.1°F | 1.64 | 13.5 | 9 | <1 | 31 | 8 h 40 min |
| Year (annual) | 49°F | 30°F | 39.5°F | 33.60 | 73.7 | 120 | 1 | 191 |
The same normals in °C and millimetres
| Month | High | Low | Mean | Precip. | Snow |
|---|---|---|---|---|---|
| January | −7°C | −17°C | −12.1°C | 35 mm | 39 cm |
| February | −4°C | −17°C | −10.4°C | 30 mm | 37 cm |
| March | 2°C | −10°C | −4.1°C | 45 mm | 30 cm |
| April | 9°C | −3°C | 3.1°C | 72 mm | 21 cm |
| May | 17°C | 4°C | 10.7°C | 96 mm | 0 cm |
| June | 22°C | 11°C | 16.6°C | 105 mm | 0 cm |
| July | 24°C | 13°C | 18.8°C | 109 mm | 0 cm |
| August | 23°C | 13°C | 17.8°C | 85 mm | 0 cm |
| September | 19°C | 8°C | 13.5°C | 97 mm | 0 cm |
| October | 11°C | 1°C | 6.0°C | 87 mm | 5 cm |
| November | 3°C | −6°C | −1.5°C | 50 mm | 22 cm |
| December | −4°C | −13°C | −8.3°C | 42 mm | 34 cm |
Source: NOAA NCEI 1991-2020 monthly normals, station USC00477480; 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.
Which months are mildest at St Germain?
Normal highs sit between 65°F and 85°F in 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 USC00477480.
When is the last frost at St Germain?
In St Germain, the last spring frost (32°F) comes after May 19 in half of years and after May 31 in one year in ten; the first autumn frost comes before October 3 in half of years and before September 18 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 191 year in 10 after May 31; 9 in 10 after May 5
- First autumn frost, half of years before
- October 31 year in 10 before September 18; 9 in 10 before October 13
NOAA puts the median frost-free season at 136 days, and the season without a hard freeze (28°F) at 156 days.
A hard freeze (28°F) comes after May 8 in half of springs and before October 12 in half of autumns.
The USDA's 2023 Plant Hardiness Zone Map puts St Germain in zone 4a in ZIP code 54558, 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 USC00477480; 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 at St Germain?
In a normal year in St Germain, 1 day a year reaches 90°F, 191 nights fall to 32°F or colder and 120 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
- 191a normal year
- Days that stay below freezing
- 98high of 32°F or less
- Days with 0.01 inch of precipitation
- 120a normal year
- Days with 1 inch of snow or more
- 26a normal year
The highest temperature in this station's record (since 1971) is 97°F, on July 8, 1988; the lowest is −43°F, on February 4, 1996.
The wettest calendar year on that record is 1985, with 39.29 in; the snowiest season is 2018–19, with 111.9 inches.
Source: NOAA NCEI 1991-2020 annual normals, station USC00477480; records: ACIS (NOAA Regional Climate Centers), station USC00477480. Records use complete months only; a month missing more than three days is left out.
How sunny is it at St Germain?
Over a year 71% of the sunlight that would reach the ground under clear skies gets through the clouds at St Germain, 3.7 kWh per square metre a day. July is the sunniest month (78%) and December the cloudiest (56%).
| Month | Share of clear-sky sunshine | Sunshine, kWh/m² a day |
|---|---|---|
| January | 65% | 1.6 |
| February | 73% | 2.6 |
| March | 73% | 3.8 |
| April | 68% | 4.6 |
| May | 69% | 5.4 |
| June | 72% | 6.0 |
| July | 78% | 6.1 |
| August | 76% | 5.1 |
| September | 73% | 3.9 |
| October | 65% | 2.5 |
| November | 61% | 1.5 |
| December | 56% | 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 many heating and cooling degree days does St Germain record?
A normal year at St Germain brings 9,481 heating degree days, 76% more than the median U.S. place (5,373), and 221 cooling degree days, 76% 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 1,688 growing degree days a year above 50°F.
| Month | Heating | Cooling |
|---|---|---|
| January | 1,699 | 0 |
| February | 1,452 | 0 |
| March | 1,251 | 0 |
| April | 825 | 0 |
| May | 435 | 8 |
| June | 144 | 49 |
| July | 61 | 88 |
| August | 88 | 57 |
| September | 280 | 18 |
| October | 688 | 1 |
| November | 1,073 | 0 |
| December | 1,486 | 0 |
| Year (annual) | 9,481 | 221 |
Source: NOAA NCEI 1991-2020 monthly normals, station USC00477480. 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.
How does St Germain's climate compare?
St Germain is warmer than 0 of the 165 places with their own NOAA record in Wisconsin, and wetter than 50. Across the 7,247 U.S. stations with normals, its annual mean of 39.5°F is warmer than 5%.
In the Köppen classification computed from these normals, St Germain 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 St Germain 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.
- Lake Tomahawk, WI193 people · 9 mi SW
- Sayner, WI168 people · 6 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 St Germain's climate
What is the coldest month at St Germain?
January, with a normal high of 20°F and a normal low of 1°F. The warmest is July (75°F by day, 56°F at night).
Does it snow at St Germain?
Yes: 74 inches in a normal year, falling on 39 days with 0.1 inch or more, the most in January (15.2 inches).
What is the rainiest month at St Germain?
July, with 4.30 in of precipitation in a normal year; the driest is February with 1.19 in.
What plant hardiness zone is St Germain in?
The USDA's 2023 map puts St Germain in zone 4a in ZIP code 54558, the nearest ZIP area.
How late can frost come at St Germain?
In half of years the last 32°F night comes after May 19; in one year in ten it comes after May 31. Waiting until May 31 leaves about a one-in-ten chance of a later frost.
Nearby and next
- Wisconsin climateThe statewide normals and every place in the state
- Eagle River, WI11 miles from this station, 40.0°F a year
- Minocqua, WI12 miles from this station, 39.5°F a year
- Rhinelander, WI20 miles from this station, 41.4°F a year
- Willow Reservoir, WI22 miles from this station, 40.2°F a year
- Compare two placesMonth by month, side by side
Download these normals (CSV) · JSON · How these figures are made