Koosharem, Utah climate: Normal weather by month, frost dates and records
Koosharem's normal year runs from 11°F December nights to 85°F July afternoons, with 10.1 inches of precipitation a year. (NOAA 1991-2020 normals)
In metric: a yearly mean of 7.1°C, December lows of −12°C, July highs of 29°C, 256 mm of precipitation a year.
- NOAA stationKoosharem
- Station IDUSC00424764
- Location38.51°N 111.88°W
- Elevation6,930 ft (2,112 m)
- Population310
On October 23, the normal high in Koosharem is 60°F and the normal low 26°F, and the chance of measurable rain or snow is 19%.
Normals describe a typical year at the station, not a forecast. The National Weather Service forecast for Koosharem.
- Jan 39° 12°
- Feb 43° 16°
- Mar 52° 21°
- Apr 59° 27°
- May 69° 32°
- Jun 80° 41°
- Jul 85° 48°
- Aug 82° 47°
- Sep 75° 39°
- Oct 63° 28°
- Nov 51° 19°
- Dec 39° 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 in Koosharem each month?
July is the warmest month, with normal highs of 85°F; December the coldest, with normal lows of 11°F. The most precipitation falls in August (1.37 in), the least in February (0.48 in).
| Month | High | Low | Mean | Precip. | Wet days | 90°F days | Freezing nights | Daylight |
|---|---|---|---|---|---|---|---|---|
| January | 39°F | 12°F | 25.3°F | 0.70 | 6 | <1 | 31 | 9 h 50 min |
| February | 43°F | 16°F | 29.3°F | 0.48 | 7 | <1 | 28 | 10 h 40 min |
| March | 52°F | 21°F | 36.5°F | 0.72 | 6 | <1 | 30 | 11 h 50 min |
| April | 59°F | 27°F | 42.9°F | 0.59 | 7 | <1 | 25 | 13 h 10 min |
| May | 69°F | 32°F | 50.5°F | 0.88 | 5 | <1 | 15 | 14 h 10 min |
| June | 80°F | 41°F | 60.3°F | 0.55 | 3 | 2 | 4 | 14 h 50 min |
| July | 85°F | 48°F | 66.4°F | 1.29 | 7 | 5 | <1 | 14 h 40 min |
| August | 82°F | 47°F | 64.2°F | 1.37 | 9 | 1 | <1 | 13 h 40 min |
| September | 75°F | 39°F | 56.9°F | 1.14 | 7 | <1 | 7 | 12 h 30 min |
| October | 63°F | 28°F | 45.3°F | 1.16 | 6 | <1 | 23 | 11 h 20 min |
| November | 51°F | 19°F | 34.8°F | 0.56 | 5 | <1 | 29 | 10 h 10 min |
| December | 39°F | 11°F | 25.0°F | 0.65 | 5 | <1 | 31 | 9 h 30 min |
| Year (annual) | 61°F | 28°F | 44.8°F | 10.09 | 72 | 8 | 221 |
The same normals in °C and millimetres
| Month | High | Low | Mean | Precip. |
|---|---|---|---|---|
| January | 4°C | −11°C | −3.7°C | 18 mm |
| February | 6°C | −9°C | −1.5°C | 12 mm |
| March | 11°C | −6°C | 2.5°C | 18 mm |
| April | 15°C | −3°C | 6.1°C | 15 mm |
| May | 20°C | 0°C | 10.3°C | 22 mm |
| June | 26°C | 5°C | 15.7°C | 14 mm |
| July | 29°C | 9°C | 19.1°C | 33 mm |
| August | 28°C | 8°C | 17.9°C | 35 mm |
| September | 24°C | 4°C | 13.8°C | 29 mm |
| October | 17°C | −2°C | 7.4°C | 29 mm |
| November | 10°C | −7°C | 1.6°C | 14 mm |
| December | 4°C | −12°C | −3.9°C | 17 mm |
NOAA publishes no 1991-2020 snowfall normal for this station. The nearest record that keeps one, Loa (15 miles away), gets 19 inches of snow in a normal year; elevation and distance can change that.
Source: NOAA NCEI 1991-2020 monthly normals, station USC00424764; 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 Koosharem?
Normal highs sit between 65°F and 85°F in May, June, July, August and September. Of those, June has the fewest days with rain (3).
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 USC00424764.
When is the last frost in Koosharem?
In Koosharem, the last spring frost (32°F) comes after June 6 in half of years and after June 26 in one year in ten; the first autumn frost comes before September 21 in half of years and before September 5 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 61 year in 10 after June 26; 9 in 10 after May 24
- First autumn frost, half of years before
- September 211 year in 10 before September 5; 9 in 10 before October 2
NOAA puts the median frost-free season at 104 days, and the season without a hard freeze (28°F) at 126 days.
A hard freeze (28°F) comes after May 26 in half of springs and before September 29 in half of autumns.
The USDA's 2023 Plant Hardiness Zone Map puts Koosharem in zone 5b in ZIP code 84732, the nearest ZIP area.
Frost dates for every NOAA station in Utah · Frost dates by ZIP code
Source: NOAA NCEI 1991-2020 annual normals (frost probabilities), station USC00424764; 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 in Koosharem?
In a normal year in Koosharem, 8 days a year reach 90°F, 221 nights fall to 32°F or colder and 72 days bring measurable precipitation.
- Days at 90°F or more
- 8a normal year
- Days at 100°F or more
- fewer than 1a normal year
- Nights at 32°F or colder
- 221a normal year
- Days that stay below freezing
- 19high of 32°F or less
- Days with 0.01 inch of precipitation
- 72a normal year
Source: NOAA NCEI 1991-2020 annual normals, station USC00424764.
How sunny is Koosharem?
Over a year 81% of the sunlight that would reach the ground under clear skies gets through the clouds in the area around Koosharem, 5.1 kWh per square metre a day. June is the sunniest month (87%) and December the cloudiest (76%).
| Month | Share of clear-sky sunshine | Sunshine, kWh/m² a day |
|---|---|---|
| January | 79% | 2.8 |
| February | 77% | 3.6 |
| March | 78% | 4.9 |
| April | 79% | 6.2 |
| May | 81% | 7.1 |
| June | 87% | 8.0 |
| July | 79% | 6.9 |
| August | 80% | 6.2 |
| September | 85% | 5.6 |
| October | 85% | 4.3 |
| November | 81% | 3.0 |
| December | 76% | 2.3 |
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 Koosharem need?
A normal year in Koosharem brings 7,475 heating degree days, 39% more than the median U.S. place (5,373), and 133 cooling degree days, 85% 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 1,620 growing degree days a year above 50°F.
| Month | Heating | Cooling |
|---|---|---|
| January | 1,231 | 0 |
| February | 1,000 | 0 |
| March | 882 | 0 |
| April | 663 | 0 |
| May | 450 | 1 |
| June | 157 | 18 |
| July | 35 | 78 |
| August | 60 | 35 |
| September | 245 | 2 |
| October | 609 | 0 |
| November | 906 | 0 |
| December | 1,238 | 0 |
| Year (annual) | 7,475 | 133 |
Source: NOAA NCEI 1991-2020 monthly normals, station USC00424764. 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 Koosharem's climate compare?
Koosharem is warmer than 15 of the other 96 places with their own NOAA record in Utah, and wetter than 29. Across the 7,247 U.S. stations with normals, its annual mean of 44.8°F is warmer than 18%.
In the Köppen classification computed from these normals, Koosharem 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 Koosharem's climate
What is the coldest month in Koosharem?
December, with a normal high of 39°F and a normal low of 11°F. The warmest is July (85°F by day, 48°F at night).
Does it snow in Koosharem?
Yes. NOAA publishes no 1991-2020 snowfall normal for Koosharem's NOAA station; the nearest record that keeps one, Loa (15 miles away), records 19 inches of snow in a normal year.
What is the rainiest month in Koosharem?
August, with 1.37 in of precipitation in a normal year; the driest is February with 0.48 in.
What plant hardiness zone is Koosharem in?
The USDA's 2023 map puts Koosharem in zone 5b in ZIP code 84732, the nearest ZIP area.
How late can frost come in Koosharem?
In half of years the last 32°F night comes after June 6; in one year in ten it comes after June 26. Waiting until June 26 leaves about a one-in-ten chance of a later frost.
Nearby and next
- Utah climateThe statewide normals and every place in the state
- Loa, UT15 miles from this station, 44.5°F a year
- Angle, UT19 miles from this station, 43.9°F a year
- Marysvale, UT19 miles from this station, 49.2°F a year
- Richfield, UT21 miles from this station, 49.7°F a year
- Compare two placesMonth by month, side by side
Download these normals (CSV) · JSON · How these figures are made