Richfield, Wisconsin climate: Normal weather by month, frost dates and records
Richfield's normal year runs from 11°F January nights to 83°F July afternoons, with 36.8 inches of precipitation a year. (NOAA 1991-2020 normals)
In metric: a yearly mean of 8.1°C, January lows of −12°C, July highs of 28°C, 935 mm of precipitation a year.
- NOAA stationRichfield (3 mi SSW)
- Station IDUSC00477148
- Location43.21°N 88.21°W
- Elevation984 ft (300 m)
- From the center2 miles
- Population11,783
On October 23, the normal high in Richfield is 57°F and the normal low 37°F.
Normals describe a typical year at the station, not a forecast. The National Weather Service forecast for Richfield.
- Jan 28° 11°
- Feb 32° 13°
- Mar 43° 23°
- Apr 56° 34°
- May 68° 45°
- Jun 79° 54°
- Jul 83° 60°
- Aug 81° 59°
- Sep 73° 51°
- Oct 60° 40°
- Nov 45° 28°
- Dec 33° 18°
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 Richfield each month?
July is the warmest month, with normal highs of 83°F; January the coldest, with normal lows of 11°F. The most precipitation falls in June (4.65 in), the least in January (1.74 in).
| Month | High | Low | Mean | Precip. | Wet days | 90°F days | Freezing nights | Daylight |
|---|---|---|---|---|---|---|---|---|
| January | 28°F | 11°F | 19.2°F | 1.74 | – | <1 | 30 | 9 h 20 min |
| February | 32°F | 13°F | 22.7°F | 1.85 | – | <1 | 27 | 10 h 30 min |
| March | 43°F | 23°F | 33.4°F | 2.13 | – | <1 | 26 | 11 h 50 min |
| April | 56°F | 34°F | 44.7°F | 3.85 | – | <1 | 14 | 13 h 20 min |
| May | 68°F | 45°F | 56.7°F | 4.13 | – | 1 | 1 | 14 h 40 min |
| June | 79°F | 54°F | 66.5°F | 4.65 | – | 2 | <1 | 15 h 20 min |
| July | 83°F | 60°F | 71.8°F | 4.18 | – | 6 | <1 | 15 h 10 min |
| August | 81°F | 59°F | 70.0°F | 3.69 | – | 3 | <1 | 14 h |
| September | 73°F | 51°F | 62.0°F | 3.30 | – | 1 | <1 | 12 h 30 min |
| October | 60°F | 40°F | 49.9°F | 2.93 | – | <1 | 7 | 11 h 10 min |
| November | 45°F | 28°F | 36.3°F | 2.25 | – | <1 | 21 | 9 h 50 min |
| December | 33°F | 18°F | 25.1°F | 2.10 | – | <1 | 28 | 9 h |
| Year (annual) | 57°F | 36°F | 46.5°F | 36.80 | – | 13 | 153 |
The same normals in °C and millimetres
| Month | High | Low | Mean | Precip. |
|---|---|---|---|---|
| January | −2°C | −12°C | −7.1°C | 44 mm |
| February | 0°C | −10°C | −5.2°C | 47 mm |
| March | 6°C | −5°C | 0.8°C | 54 mm |
| April | 13°C | 1°C | 7.1°C | 98 mm |
| May | 20°C | 7°C | 13.7°C | 105 mm |
| June | 26°C | 12°C | 19.2°C | 118 mm |
| July | 28°C | 16°C | 22.1°C | 106 mm |
| August | 27°C | 15°C | 21.1°C | 94 mm |
| September | 23°C | 11°C | 16.7°C | 84 mm |
| October | 16°C | 4°C | 9.9°C | 74 mm |
| November | 7°C | −2°C | 2.4°C | 57 mm |
| December | 0°C | −8°C | −3.8°C | 53 mm |
NOAA publishes no 1991-2020 snowfall normal for this station. The nearest record that keeps one, Germantown (5 miles away), gets 54 inches of snow in a normal year; elevation and distance can change that.
Source: NOAA NCEI 1991-2020 monthly normals, station USC00477148; 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 Richfield?
Normal highs sit between 65°F and 85°F in May, June, July, August and September.
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 USC00477148.
When is the last frost in Richfield?
In Richfield, the last spring frost (32°F) comes after April 30 in half of years and after May 16 in one year in ten; the first autumn frost comes before October 16 in half of years and before October 1 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 301 year in 10 after May 16; 9 in 10 after April 16
- First autumn frost, half of years before
- October 161 year in 10 before October 1; 9 in 10 before October 29
NOAA puts the median frost-free season at 167 days, and the season without a hard freeze (28°F) at 190 days.
A hard freeze (28°F) comes after April 19 in half of springs and before October 27 in half of autumns.
The USDA's 2023 Plant Hardiness Zone Map puts Richfield in zones 5a to 5b across its 3 ZIP code areas (5a in 53033, the largest). By the map's own method, the average of each year's coldest night over 1991-2020, Richfield's NOAA station is in zone 5b: the coldest night of a typical year reaches −13°F (21 complete years); the map interpolates between stations and terrain, so the station and the ZIP area can differ by half a zone.
Frost dates for every NOAA station in Wisconsin · Frost dates by ZIP code
Source: NOAA NCEI 1991-2020 annual normals (frost probabilities), station USC00477148; 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.
What hardiness zone is each Richfield ZIP code in?
The USDA's 2023 map gives each ZIP code area one zone. Richfield's 3 ZIP code areas run from zone 5a to 5b: 2 in 5a and 1 in 5b. Each ZIP's frost dates are in the frost tool.
Source: USDA 2023 Plant Hardiness Zone Map, ZIP listings: PRISM Group, Oregon State University, https://prism.oregonstate.edu, accessed October 8, 2026; ZIP areas in the place: Census Bureau 2020 ZCTA-to-place relationship file. A ZIP area counts when at least a tenth of its land (and 0.5 km²) lies in the place.
How hot and how cold does it get in Richfield?
In a normal year in Richfield, 13 days a year reach 90°F and 153 nights fall to 32°F or colder.
- Days at 90°F or more
- 13a normal year
- Days at 100°F or more
- fewer than 1a normal year
- Nights at 32°F or colder
- 153a normal year
- Days that stay below freezing
- 58high of 32°F or less
Source: NOAA NCEI 1991-2020 annual normals, station USC00477148.
How sunny is Richfield?
Over a year 72% of the sunlight that would reach the ground under clear skies gets through the clouds in the area around Richfield, 3.8 kWh per square metre a day. July is the sunniest month (80%) and December the cloudiest (59%).
| Month | Share of clear-sky sunshine | Sunshine, kWh/m² a day |
|---|---|---|
| January | 63% | 1.6 |
| February | 70% | 2.7 |
| March | 70% | 3.7 |
| April | 68% | 4.6 |
| May | 71% | 5.5 |
| June | 76% | 6.1 |
| July | 80% | 6.3 |
| August | 78% | 5.3 |
| September | 77% | 4.2 |
| October | 68% | 2.7 |
| November | 66% | 1.8 |
| December | 59% | 1.3 |
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 Richfield need?
A normal year in Richfield brings 7,284 heating degree days, 36% more than the median U.S. place (5,373), and 580 cooling degree days, 36% 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 2,585 growing degree days a year above 50°F.
| Month | Heating | Cooling |
|---|---|---|
| January | 1,421 | 0 |
| February | 1,186 | 0 |
| March | 981 | 2 |
| April | 610 | 1 |
| May | 282 | 24 |
| June | 56 | 101 |
| July | 11 | 220 |
| August | 19 | 172 |
| September | 147 | 56 |
| October | 474 | 4 |
| November | 861 | 0 |
| December | 1,237 | 0 |
| Year (annual) | 7,284 | 580 |
Source: NOAA NCEI 1991-2020 monthly normals, station USC00477148. 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 Richfield's climate compare?
Richfield is warmer than 118 of the other 164 places with their own NOAA record in Wisconsin, and wetter than 122. Across the 7,247 U.S. stations with normals, its annual mean of 46.5°F is warmer than 25%.
In the Köppen classification computed from these normals, Richfield 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 Richfield share this climate record?
4 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.
- Sussex, WI12,607 people · 5 mi S
- Lisbon, WI11,127 people · 4 mi SW
- Merton, WI3,655 people · 7 mi SW
- Lannon, WI2,048 people · 5 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 Richfield's climate
What is the coldest month in Richfield?
January, with a normal high of 28°F and a normal low of 11°F. The warmest is July (83°F by day, 60°F at night).
Does it snow in Richfield?
Yes. NOAA publishes no 1991-2020 snowfall normal for Richfield's NOAA station; the nearest record that keeps one, Germantown (5 miles away), records 54 inches of snow in a normal year.
What is the rainiest month in Richfield?
June, with 4.65 in of precipitation in a normal year; the driest is January with 1.74 in.
What plant hardiness zone is Richfield in?
The USDA's 2023 map puts Richfield in zones 5a to 5b across its 3 ZIP code areas (5a in 53033, the largest). By the same method at Richfield's NOAA station, the coldest night of a typical year reaches −13°F (21 years, 1991-2020): zone 5b.
How late can frost come in Richfield?
In half of years the last 32°F night comes after April 30; in one year in ten it comes after May 16. Waiting until May 16 leaves about a one-in-ten chance of a later frost.
Nearby and next
- Wisconsin climateThe statewide normals and every place in the state
- Germantown, WI5 miles from this station, 45.8°F a year
- Jackson, WI7 miles from this station, 46.7°F a year
- Slinger, WI9 miles from this station, 44.4°F a year
- Brookfield, WI11 miles from this station, 46.6°F a year
- Compare two placesMonth by month, side by side
Download these normals (CSV) · JSON · How these figures are made