Hill City (1 mi W), Idaho climate: Climate normals at a NOAA weather station
Hill City (1 mi W)'s normal year runs from 9°F January nights to 85°F July afternoons, with 14.0 inches of precipitation a year. (NOAA 1991-2020 normals)
In metric: a yearly mean of 5.6°C, January lows of −13°C, July highs of 30°C, 355 mm of precipitation a year.
- NOAA stationHill City (1 mi W)
- Station IDUSC00104268
- Location43.30°N 115.07°W
- Elevation5,100 ft (1,555 m)
On October 24, the normal high in Hill City (1 mi W) is 56°F and the normal low 26°F, and the chance of measurable rain or snow is 20%.
Normals describe a typical year at the station, not a forecast. The National Weather Service forecast for Hill City (1 mi W).
- Jan 29° 9°
- Feb 32° 12°
- Mar 42° 21°
- Apr 54° 29°
- May 65° 35°
- Jun 75° 40°
- Jul 85° 47°
- Aug 85° 45°
- Sep 76° 37°
- Oct 61° 28°
- Nov 43° 20°
- Dec 30° 11°
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 Hill City (1 mi W) each month?
July is the warmest month, with normal highs of 85°F; January the coldest, with normal lows of 9°F. The most precipitation falls in December (2.72 in), the least in August (0.24 in).
| Month | High | Low | Mean | Precip. | Wet days | 90°F days | Freezing nights | Daylight |
|---|---|---|---|---|---|---|---|---|
| January | 29°F | 9°F | 19.1°F | 2.06 | 11 | <1 | 31 | 9 h 20 min |
| February | 32°F | 12°F | 21.8°F | 1.22 | 9 | <1 | 28 | 10 h 30 min |
| March | 42°F | 21°F | 31.4°F | 1.17 | 8 | <1 | 29 | 11 h 50 min |
| April | 54°F | 29°F | 41.5°F | 1.20 | 8 | <1 | 21 | 13 h 20 min |
| May | 65°F | 35°F | 50.0°F | 1.28 | 8 | <1 | 10 | 14 h 40 min |
| June | 75°F | 40°F | 57.4°F | 0.80 | 6 | 1 | 4 | 15 h 20 min |
| July | 85°F | 47°F | 66.0°F | 0.47 | 3 | 8 | <1 | 15 h 10 min |
| August | 85°F | 45°F | 64.9°F | 0.24 | 3 | 7 | 2 | 14 h |
| September | 76°F | 37°F | 56.3°F | 0.52 | 4 | <1 | 8 | 12 h 30 min |
| October | 61°F | 28°F | 44.4°F | 1.05 | 6 | <1 | 21 | 11 h 10 min |
| November | 43°F | 20°F | 31.4°F | 1.26 | 8 | <1 | 28 | 9 h 40 min |
| December | 30°F | 11°F | 20.5°F | 2.72 | 12 | <1 | 30 | 9 h |
| Year (annual) | 56°F | 28°F | 42.1°F | 13.99 | 85 | 16 | 212 |
The same normals in °C and millimetres
| Month | High | Low | Mean | Precip. |
|---|---|---|---|---|
| January | −2°C | −13°C | −7.2°C | 52 mm |
| February | 0°C | −11°C | −5.7°C | 31 mm |
| March | 6°C | −6°C | −0.3°C | 30 mm |
| April | 12°C | −2°C | 5.3°C | 30 mm |
| May | 18°C | 2°C | 10.0°C | 33 mm |
| June | 24°C | 5°C | 14.1°C | 20 mm |
| July | 30°C | 8°C | 18.9°C | 12 mm |
| August | 30°C | 7°C | 18.3°C | 6 mm |
| September | 24°C | 3°C | 13.5°C | 13 mm |
| October | 16°C | −2°C | 6.9°C | 27 mm |
| November | 6°C | −7°C | −0.3°C | 32 mm |
| December | −1°C | −12°C | −6.4°C | 69 mm |
NOAA publishes no 1991-2020 snowfall normal for this station, and no record within 25 miles keeps one, so snow is left out here rather than estimated.
Source: NOAA NCEI 1991-2020 monthly normals, station USC00104268; 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 Hill City (1 mi W)?
Normal highs sit between 65°F and 85°F in 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 USC00104268.
When is the last frost at Hill City (1 mi W)?
In Hill City (1 mi W), the last spring frost (32°F) comes after June 16 in half of years and after July 3 in one year in ten; the first autumn frost comes before September 6 in half of years and before August 20 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 161 year in 10 after July 3; 9 in 10 after May 31
- First autumn frost, half of years before
- September 61 year in 10 before August 20; 9 in 10 before September 22
NOAA puts the median frost-free season at 80 days, and the season without a hard freeze (28°F) at 109 days.
A hard freeze (28°F) comes after May 30 in half of springs and before September 18 in half of autumns.
The USDA's 2023 Plant Hardiness Zone Map puts Hill City (1 mi W) in zone 5a in ZIP code 83322, the nearest ZIP area.
Frost dates for every NOAA station in Idaho · Frost dates by ZIP code
Source: NOAA NCEI 1991-2020 annual normals (frost probabilities), station USC00104268; 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 Hill City (1 mi W)?
In a normal year in Hill City (1 mi W), 16 days a year reach 90°F, 212 nights fall to 32°F or colder and 85 days bring measurable precipitation.
- Days at 90°F or more
- 16a normal year
- Days at 100°F or more
- fewer than 1a normal year
- Nights at 32°F or colder
- 212a normal year
- Days that stay below freezing
- 60high of 32°F or less
- Days with 0.01 inch of precipitation
- 85a normal year
The highest temperature in this station's record (since 1915) is 102°F, on July 28, 1934; the lowest is −49°F, on December 22, 1990.
The wettest calendar year on that record is 1970, with 24.60 in; the snowiest season is 1951–52, with 271.0 inches.
Source: NOAA NCEI 1991-2020 annual normals, station USC00104268; records: ACIS (NOAA Regional Climate Centers), station USC00104268. Records use complete months only; a month missing more than three days is left out.
How sunny is it at Hill City (1 mi W)?
Over a year 81% of the sunlight that would reach the ground under clear skies gets through the clouds at Hill City (1 mi W), 4.6 kWh per square metre a day. July is the sunniest month (92%) and December the cloudiest (63%).
| Month | Share of clear-sky sunshine | Sunshine, kWh/m² a day |
|---|---|---|
| January | 67% | 1.8 |
| February | 71% | 2.8 |
| March | 70% | 3.9 |
| April | 75% | 5.4 |
| May | 79% | 6.6 |
| June | 85% | 7.6 |
| July | 92% | 7.8 |
| August | 91% | 6.7 |
| September | 87% | 5.2 |
| October | 80% | 3.5 |
| November | 71% | 2.1 |
| December | 63% | 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 many heating and cooling degree days does Hill City (1 mi W) record?
A normal year at Hill City (1 mi W) brings 8,513 heating degree days, 58% more than the median U.S. place (5,373), and 182 cooling degree days, 80% 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 1,547 growing degree days a year above 50°F.
| Month | Heating | Cooling |
|---|---|---|
| January | 1,423 | 0 |
| February | 1,211 | 0 |
| March | 1,040 | 0 |
| April | 704 | 0 |
| May | 465 | 0 |
| June | 240 | 12 |
| July | 60 | 91 |
| August | 73 | 72 |
| September | 269 | 8 |
| October | 640 | 0 |
| November | 1,010 | 0 |
| December | 1,379 | 0 |
| Year (annual) | 8,513 | 182 |
Source: NOAA NCEI 1991-2020 monthly normals, station USC00104268. 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 Hill City (1 mi W)'s climate compare?
Hill City (1 mi W) is warmer than 8 of the 85 places with their own NOAA record in Idaho, and wetter than 39. Across the 7,247 U.S. stations with normals, its annual mean of 42.1°F is warmer than 10%.
In the Köppen classification computed from these normals, Hill City (1 mi W) is Dsb: continental, dry-summer, 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 Hill City (1 mi W)'s climate
What is the coldest month at Hill City (1 mi W)?
January, with a normal high of 29°F and a normal low of 9°F. The warmest is July (85°F by day, 47°F at night).
What is the rainiest month at Hill City (1 mi W)?
December, with 2.72 in of precipitation in a normal year; the driest is August with 0.24 in.
What plant hardiness zone is Hill City (1 mi W) in?
The USDA's 2023 map puts Hill City (1 mi W) in zone 5a in ZIP code 83322, the nearest ZIP area.
How late can frost come at Hill City (1 mi W)?
In half of years the last 32°F night comes after June 16; in one year in ten it comes after July 3. Waiting until July 3 leaves about a one-in-ten chance of a later frost.
Nearby and next
- Idaho climateThe statewide normals and every place in the state
- Fairfield, ID14 miles from this station, 42.1°F a year
- Glenns Ferry, ID28 miles from this station, 54.6°F a year
- Mountain Home, ID34 miles from this station, 52.3°F a year
- Hagerman, ID35 miles from this station, 50.6°F a year
- Compare two placesMonth by month, side by side
Download these normals (CSV) · JSON · How these figures are made