Hamer, Idaho climate: Normal weather by month, frost dates and records
Hamer's normal year runs from 7°F January nights to 89°F July afternoons, with 8.9 inches of precipitation and 20 inches of snow a year. (NOAA 1991-2020 normals)
In metric: a yearly mean of 6.6°C, January lows of −14°C, July highs of 32°C, 227 mm of precipitation a year.
- NOAA stationHamer (4 mi NW)
- Station IDUSC00103964
- Location43.97°N 112.26°W
- Elevation4,790 ft (1,460 m)
- From the center4 miles
- Population51
On October 24, the normal high in Hamer is 57°F and the normal low 25°F, and the chance of measurable rain or snow is 13%.
Normals describe a typical year at the station, not a forecast. The National Weather Service forecast for Hamer.
- Jan 29° 7°
- Feb 36° 11°
- Mar 49° 22°
- Apr 60° 29°
- May 70° 37°
- Jun 79° 44°
- Jul 89° 49°
- Aug 87° 47°
- Sep 78° 39°
- Oct 62° 28°
- Nov 44° 17°
- Dec 30° 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 in Hamer each month?
July is the warmest month, with normal highs of 89°F; January the coldest, with normal lows of 7°F. The most precipitation falls in May (1.47 in), the least in February (0.44 in).
| Month | High | Low | Mean | Precip. | Snow | Wet days | 90°F days | Freezing nights | Daylight |
|---|---|---|---|---|---|---|---|---|---|
| January | 29°F | 7°F | 18.1°F | 0.72 | 5.8 | 6 | <1 | 31 | 9 h 10 min |
| February | 36°F | 11°F | 23.4°F | 0.44 | 3.5 | 5 | <1 | 28 | 10 h 30 min |
| March | 49°F | 22°F | 35.3°F | 0.50 | 1.7 | 4 | <1 | 28 | 11 h 50 min |
| April | 60°F | 29°F | 44.7°F | 0.94 | 0.8 | 6 | <1 | 22 | 13 h 20 min |
| May | 70°F | 37°F | 53.6°F | 1.47 | 0.0 | 7 | <1 | 8 | 14 h 40 min |
| June | 79°F | 44°F | 61.4°F | 1.11 | 0.0 | 6 | 3 | 1 | 15 h 30 min |
| July | 89°F | 49°F | 68.9°F | 0.52 | 0.0 | 4 | 15 | <1 | 15 h 10 min |
| August | 87°F | 47°F | 67.3°F | 0.51 | 0.0 | 4 | 12 | 1 | 14 h |
| September | 78°F | 39°F | 58.2°F | 0.63 | 0.0 | 4 | 1 | 6 | 12 h 40 min |
| October | 62°F | 28°F | 45.0°F | 0.73 | 0.1 | 4 | <1 | 22 | 11 h 10 min |
| November | 44°F | 17°F | 30.5°F | 0.56 | 1.7 | 5 | <1 | 28 | 9 h 40 min |
| December | 30°F | 9°F | 19.6°F | 0.80 | 6.8 | 6 | <1 | 31 | 9 h |
| Year (annual) | 59°F | 28°F | 43.8°F | 8.93 | 20.4 | 61 | 31 | 205 |
The same normals in °C and millimetres
| Month | High | Low | Mean | Precip. | Snow |
|---|---|---|---|---|---|
| January | −2°C | −14°C | −7.7°C | 18 mm | 15 cm |
| February | 2°C | −11°C | −4.8°C | 11 mm | 9 cm |
| March | 9°C | −6°C | 1.8°C | 13 mm | 4 cm |
| April | 16°C | −2°C | 7.1°C | 24 mm | 2 cm |
| May | 21°C | 3°C | 12.0°C | 37 mm | 0 cm |
| June | 26°C | 7°C | 16.3°C | 28 mm | 0 cm |
| July | 32°C | 10°C | 20.5°C | 13 mm | 0 cm |
| August | 31°C | 8°C | 19.6°C | 13 mm | 0 cm |
| September | 25°C | 4°C | 14.6°C | 16 mm | 0 cm |
| October | 16°C | −2°C | 7.2°C | 19 mm | 0 cm |
| November | 7°C | −8°C | −0.8°C | 14 mm | 4 cm |
| December | −1°C | −13°C | −6.9°C | 20 mm | 17 cm |
Source: NOAA NCEI 1991-2020 monthly normals, station USC00103964; 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 Hamer?
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 USC00103964.
When is the last frost in Hamer?
In Hamer, the last spring frost (32°F) comes after June 3 in half of years and after June 21 in one year in ten; the first autumn frost comes before September 11 in half of years and before August 30 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
- June 31 year in 10 after June 21; 9 in 10 after May 15
- First autumn frost, half of years before
- September 111 year in 10 before August 30; 9 in 10 before September 24
NOAA puts the median frost-free season at 98 days, and the season without a hard freeze (28°F) at 127 days.
A hard freeze (28°F) comes after May 14 in half of springs and before September 21 in half of autumns.
The USDA's 2023 Plant Hardiness Zone Map puts Hamer in zone 5a in ZIP code 83425, the nearest ZIP area. By the map's own method, the average of each year's coldest night over 1991-2020, Hamer's NOAA station is in zone 4b: the coldest night of a typical year reaches −23°F (22 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 Idaho · Frost dates by ZIP code
Source: NOAA NCEI 1991-2020 annual normals (frost probabilities), station USC00103964; 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 Hamer?
In a normal year in Hamer, 31 days a year reach 90°F, 205 nights fall to 32°F or colder and 61 days bring measurable precipitation.
- Days at 90°F or more
- 31a normal year
- Days at 100°F or more
- fewer than 1a normal year
- Nights at 32°F or colder
- 205a normal year
- Days that stay below freezing
- 55high of 32°F or less
- Days with 0.01 inch of precipitation
- 61a normal year
- Days with 1 inch of snow or more
- 10a normal year
The highest temperature in this station's record (since 1948) is 105°F, on July 20, 1960; the lowest is −48°F, on January 1, 1979.
The wettest calendar year on that record is 1995, with 13.18 in; the snowiest season is 1970–71, with 53.6 inches.
Source: NOAA NCEI 1991-2020 annual normals, station USC00103964; records: ACIS (NOAA Regional Climate Centers), station USC00103964. Records use complete months only; a month missing more than three days is left out.
How sunny is Hamer?
Over a year 80% of the sunlight that would reach the ground under clear skies gets through the clouds in the area around Hamer, 4.5 kWh per square metre a day. July is the sunniest month (90%) and December the cloudiest (60%).
| Month | Share of clear-sky sunshine | Sunshine, kWh/m² a day |
|---|---|---|
| January | 65% | 1.8 |
| February | 68% | 2.7 |
| March | 73% | 4.1 |
| April | 76% | 5.5 |
| May | 79% | 6.6 |
| June | 85% | 7.5 |
| July | 90% | 7.6 |
| August | 89% | 6.6 |
| September | 87% | 5.1 |
| October | 80% | 3.5 |
| November | 72% | 2.1 |
| December | 60% | 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 Hamer need?
A normal year in Hamer brings 7,992 heating degree days, 49% more than the median U.S. place (5,373), and 308 cooling degree days, 66% 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 1,964 growing degree days a year above 50°F.
| Month | Heating | Cooling |
|---|---|---|
| January | 1,455 | 0 |
| February | 1,165 | 0 |
| March | 921 | 0 |
| April | 611 | 0 |
| May | 357 | 3 |
| June | 144 | 36 |
| July | 26 | 148 |
| August | 36 | 106 |
| September | 218 | 14 |
| October | 620 | 0 |
| November | 1,034 | 0 |
| December | 1,406 | 0 |
| Year (annual) | 7,992 | 308 |
Source: NOAA NCEI 1991-2020 monthly normals, station USC00103964. 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 Hamer been warmer than normal lately?
2024 averaged 46.2°F, 2.4°F above the 1991-2020 normal of 43.8°F. 1 of the 4 complete years since 2021 ran warmer than the normal.
| Year | Mean | Against normal | Precip. | Snow |
|---|---|---|---|---|
| 2021 | 43.8°F | at normal | 8.49 | 21.0 |
| 2022 | 41.6°F | −2.2°F | 7.41 | 28.5 |
| 2023 | 41.2°F | −2.6°F | 7.17 | 30.0 |
| 2024 | 46.2°F | +2.4°F | 7.88 | 30.0 |
Over 44 complete years from 1949 to 2024, the station's annual mean temperature rose at a fitted 3.7°F per century (+0.20°C per decade). A fitted rate summarizes the whole record; single years swing well above and below it.
Source: observed years: ACIS, station USC00103964; trend: NOAA GHCN-Monthly v4. A year counts only with all twelve months complete.
How does Hamer's climate compare?
Hamer is warmer than 21 of the other 84 places with their own NOAA record in Idaho, and wetter than 4. Across the 7,247 U.S. stations with normals, its annual mean of 43.8°F is warmer than 15%.
In the Köppen classification computed from these normals, Hamer 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 Hamer's climate
What is the coldest month in Hamer?
January, with a normal high of 29°F and a normal low of 7°F. The warmest is July (89°F by day, 49°F at night).
Does it snow in Hamer?
Yes: 20 inches in a normal year, falling on 16 days with 0.1 inch or more, the most in December (6.8 inches).
What is the rainiest month in Hamer?
May, with 1.47 in of precipitation in a normal year; the driest is February with 0.44 in.
What plant hardiness zone is Hamer in?
The USDA's 2023 map puts Hamer in zone 5a in ZIP code 83425, the nearest ZIP area. By the same method at Hamer's NOAA station, the coldest night of a typical year reaches −23°F (22 years, 1991-2020): zone 4b.
How late can frost come in Hamer?
In half of years the last 32°F night comes after June 3; in one year in ten it comes after June 21. Waiting until June 21 leaves about a one-in-ten chance of a later frost.
Nearby and next
- Idaho climateThe statewide normals and every place in the state
- Monteview, ID16 miles from this station, 41.6°F a year
- Dubois, ID19 miles from this station, 45.3°F a year
- Small (6 mi N), ID24 miles from this station, 42.5°F a year
- Rexburg, ID25 miles from this station, 44.0°F a year
- Compare two placesMonth by month, side by side
Download these normals (CSV) · JSON · How these figures are made