Richfield, Idaho climate: Normal weather by month, frost dates and records
Richfield's normal year runs from 14°F January nights to 89°F July afternoons, with 10.5 inches of precipitation and 29 inches of snow a year. (NOAA 1991-2020 normals)
In metric: a yearly mean of 7.8°C, January lows of −10°C, July highs of 32°C, 267 mm of precipitation a year.
- NOAA stationRichfield
- Station IDUSC00107673
- Location43.05°N 114.16°W
- Elevation4,309 ft (1,313 m)
- Population476
On October 23, the normal high in Richfield is 58°F and the normal low 30°F, and the chance of measurable rain or snow is 15%.
Normals describe a typical year at the station, not a forecast. The National Weather Service forecast for Richfield.
- Jan 32° 14°
- Feb 37° 18°
- Mar 49° 25°
- Apr 58° 31°
- May 68° 39°
- Jun 78° 46°
- Jul 89° 53°
- Aug 88° 52°
- Sep 77° 43°
- Oct 62° 32°
- Nov 45° 23°
- Dec 33° 15°
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 89°F; January the coldest, with normal lows of 14°F. The most precipitation falls in December (1.66 in), the least in July (0.17 in).
| Month | High | Low | Mean | Precip. | Snow | Wet days | 90°F days | Freezing nights | Daylight |
|---|---|---|---|---|---|---|---|---|---|
| January | 32°F | 14°F | 22.8°F | 1.53 | 11.5 | 8 | <1 | 31 | 9 h 20 min |
| February | 37°F | 18°F | 27.5°F | 0.91 | 6.7 | 7 | <1 | 27 | 10 h 30 min |
| March | 49°F | 25°F | 36.8°F | 1.01 | 1.0 | 7 | <1 | 27 | 11 h 50 min |
| April | 58°F | 31°F | 44.5°F | 0.88 | 0.3 | 7 | <1 | 18 | 13 h 20 min |
| May | 68°F | 39°F | 53.6°F | 1.09 | 0.0 | 7 | <1 | 6 | 14 h 40 min |
| June | 78°F | 46°F | 62.0°F | 0.70 | 0.0 | 4 | 4 | 1 | 15 h 20 min |
| July | 89°F | 53°F | 71.0°F | 0.17 | 0.0 | 2 | 16 | <1 | 15 h |
| August | 88°F | 52°F | 70.0°F | 0.29 | 0.0 | 2 | 14 | <1 | 14 h |
| September | 77°F | 43°F | 60.2°F | 0.49 | 0.0 | 4 | 2 | 2 | 12 h 30 min |
| October | 62°F | 32°F | 47.2°F | 0.87 | 0.1 | 5 | <1 | 16 | 11 h 10 min |
| November | 45°F | 23°F | 34.1°F | 0.92 | 2.1 | 6 | <1 | 27 | 9 h 50 min |
| December | 33°F | 15°F | 24.0°F | 1.66 | 6.9 | 8 | <1 | 30 | 9 h |
| Year (annual) | 60°F | 33°F | 46.1°F | 10.52 | 28.6 | 64 | 37 | 185 |
The same normals in °C and millimetres
| Month | High | Low | Mean | Precip. | Snow |
|---|---|---|---|---|---|
| January | 0°C | −10°C | −5.1°C | 39 mm | 29 cm |
| February | 3°C | −8°C | −2.5°C | 23 mm | 17 cm |
| March | 9°C | −4°C | 2.7°C | 26 mm | 3 cm |
| April | 15°C | −1°C | 6.9°C | 22 mm | 1 cm |
| May | 20°C | 4°C | 12.0°C | 28 mm | 0 cm |
| June | 26°C | 8°C | 16.7°C | 18 mm | 0 cm |
| July | 32°C | 12°C | 21.7°C | 4 mm | 0 cm |
| August | 31°C | 11°C | 21.1°C | 7 mm | 0 cm |
| September | 25°C | 6°C | 15.7°C | 12 mm | 0 cm |
| October | 17°C | 0°C | 8.4°C | 22 mm | 0 cm |
| November | 7°C | −5°C | 1.2°C | 23 mm | 5 cm |
| December | 0°C | −9°C | −4.4°C | 42 mm | 18 cm |
Source: NOAA NCEI 1991-2020 monthly normals, station USC00107673; 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 and September. Of those, September has the fewest days with rain (4).
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 USC00107673.
When is the last frost in Richfield?
In Richfield, the last spring frost (32°F) comes after May 24 in half of years and after June 14 in one year in ten; the first autumn frost comes before September 26 in half of years and before September 10 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 241 year in 10 after June 14; 9 in 10 after May 6
- First autumn frost, half of years before
- September 261 year in 10 before September 10; 9 in 10 before October 10
NOAA puts the median frost-free season at 123 days, and the season without a hard freeze (28°F) at 152 days.
A hard freeze (28°F) comes after May 8 in half of springs and before October 7 in half of autumns.
The USDA's 2023 Plant Hardiness Zone Map puts Richfield in zone 6a in ZIP code 83349, the nearest ZIP area. By the map's own method, the average of each year's coldest night over 1991-2020, Richfield's NOAA station is in zone 6a: the coldest night of a typical year reaches −9°F (23 complete years).
Frost dates for every NOAA station in Idaho · Frost dates by ZIP code
Source: NOAA NCEI 1991-2020 annual normals (frost probabilities), station USC00107673; 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 Richfield?
In a normal year in Richfield, 37 days a year reach 90°F (2 of them 100°F or more), 185 nights fall to 32°F or colder and 64 days bring measurable precipitation.
- Days at 90°F or more
- 37a normal year
- Days at 100°F or more
- 2a normal year
- Nights at 32°F or colder
- 185a normal year
- Days that stay below freezing
- 44high of 32°F or less
- Days with 0.01 inch of precipitation
- 64a normal year
- Days with 1 inch of snow or more
- 11a normal year
The highest temperature in this station's record (since 1910) is 105°F, on July 2, 1924; the lowest is −40°F, on February 9, 1933.
The wettest calendar year on that record is 1983, with 19.08 in; the snowiest season is 1915–16, with 74.7 inches.
Source: NOAA NCEI 1991-2020 annual normals, station USC00107673; records: ACIS (NOAA Regional Climate Centers), station USC00107673. Records use complete months only; a month missing more than three days is left out.
How sunny is Richfield?
Over a year 80% of the sunlight that would reach the ground under clear skies gets through the clouds in the area around Richfield, 4.6 kWh per square metre a day. July is the sunniest month (90%) and December the cloudiest (66%).
| Month | Share of clear-sky sunshine | Sunshine, kWh/m² a day |
|---|---|---|
| January | 72% | 2.0 |
| February | 72% | 2.9 |
| March | 72% | 4.1 |
| April | 74% | 5.4 |
| May | 76% | 6.4 |
| June | 84% | 7.5 |
| July | 90% | 7.7 |
| August | 89% | 6.6 |
| September | 86% | 5.1 |
| October | 80% | 3.5 |
| November | 72% | 2.1 |
| December | 66% | 1.5 |
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 7,336 heating degree days, 37% more than the median U.S. place (5,373), and 488 cooling degree days, 46% 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 2,223 growing degree days a year above 50°F.
| Month | Heating | Cooling |
|---|---|---|
| January | 1,308 | 0 |
| February | 1,051 | 0 |
| March | 874 | 0 |
| April | 617 | 1 |
| May | 359 | 8 |
| June | 145 | 54 |
| July | 21 | 207 |
| August | 26 | 181 |
| September | 181 | 37 |
| October | 553 | 1 |
| November | 929 | 0 |
| December | 1,271 | 0 |
| Year (annual) | 7,336 | 488 |
Source: NOAA NCEI 1991-2020 monthly normals, station USC00107673. 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 Richfield been warmer than normal lately?
2025 averaged 48.3°F, 2.2°F above the 1991-2020 normal of 46.1°F. 3 of the 5 complete years since 2021 ran warmer than the normal.
| Year | Mean | Against normal | Precip. | Snow |
|---|---|---|---|---|
| 2021 | 48.6°F | +2.5°F | 7.74 | 34.0 |
| 2022 | 44.1°F | −2.0°F | 5.96 | 33.5 |
| 2023 | 45.6°F | −0.5°F | 10.24 | 40.4 |
| 2024 | 47.7°F | +1.6°F | 9.66 | 48.7 |
| 2025 | 48.3°F | +2.2°F | 7.69 | 21.8 |
Over 64 complete years from 1953 to 2025, the station's annual mean temperature rose at a fitted 3.5°F per century (+0.19°C per decade). A fitted rate summarizes the whole record; single years swing well above and below it.
Source: observed years: ACIS, station USC00107673; trend: NOAA GHCN-Monthly v4. A year counts only with all twelve months complete.
How does Richfield's climate compare?
Richfield is warmer than 37 of the other 84 places with their own NOAA record in Idaho, and wetter than 20. Across the 7,247 U.S. stations with normals, its annual mean of 46.1°F is warmer than 24%.
In the Köppen classification computed from these normals, Richfield is BSk: cold semi-arid steppe. 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 Richfield's climate
What is the coldest month in Richfield?
January, with a normal high of 32°F and a normal low of 14°F. The warmest is July (89°F by day, 53°F at night).
Does it snow in Richfield?
Yes: 29 inches in a normal year, falling on 11 days with 0.1 inch or more, the most in January (11.5 inches).
What is the rainiest month in Richfield?
December, with 1.66 in of precipitation in a normal year; the driest is July with 0.17 in.
What plant hardiness zone is Richfield in?
The USDA's 2023 map puts Richfield in zone 6a in ZIP code 83349, the nearest ZIP area. By the same method at Richfield's NOAA station, the coldest night of a typical year reaches −9°F (23 years, 1991-2020): zone 6a.
How late can frost come in Richfield?
In half of years the last 32°F night comes after May 24; in one year in ten it comes after June 14. Waiting until June 14 leaves about a one-in-ten chance of a later frost.
Nearby and next
- Idaho climateThe statewide normals and every place in the state
- Shoshone, ID16 miles from this station, 52.7°F a year
- Picabo, ID18 miles from this station, 42.4°F a year
- Jerome, ID27 miles from this station, 50.2°F a year
- Bellevue, ID29 miles from this station, 46.9°F a year
- Compare two placesMonth by month, side by side
Download these normals (CSV) · JSON · How these figures are made