Arches National Park Headquarters, Utah climate: Climate normals at a NOAA weather station
Arches National Park Headquarters's normal year runs from 22°F January nights to 99°F July afternoons, with 8.4 inches of precipitation and 8 inches of snow a year. (NOAA 1991-2020 normals)
In metric: a yearly mean of 14.4°C, January lows of −5°C, July highs of 37°C, 215 mm of precipitation a year.
- NOAA stationArches National Park Headquarters
- Station IDUSC00420336
- Location38.62°N 109.62°W
- Elevation4,093 ft (1,248 m)
On October 23, the normal high in Arches National Park Headquarters is 69°F and the normal low 41°F, and the chance of measurable rain or snow is 16%.
Normals describe a typical year at the station, not a forecast. The National Weather Service forecast for Arches National Park Headquarters.
- Jan 42° 22°
- Feb 50° 29°
- Mar 62° 37°
- Apr 70° 44°
- May 80° 53°
- Jun 93° 63°
- Jul 99° 70°
- Aug 96° 68°
- Sep 87° 58°
- Oct 72° 44°
- Nov 56° 33°
- Dec 42° 24°
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 Arches National Park Headquarters each month?
July is the warmest month, with normal highs of 99°F; January the coldest, with normal lows of 22°F. The most precipitation falls in October (1.12 in), the least in June (0.43 in).
| Month | High | Low | Mean | Precip. | Snow | Wet days | 90°F days | Freezing nights | Daylight |
|---|---|---|---|---|---|---|---|---|---|
| January | 42°F | 22°F | 31.9°F | 0.55 | 2.1 | 4 | <1 | 29 | 9 h 40 min |
| February | 50°F | 29°F | 39.6°F | 0.56 | 1.2 | 5 | <1 | 22 | 10 h 40 min |
| March | 62°F | 37°F | 49.5°F | 0.65 | 0.5 | 5 | <1 | 10 | 11 h 50 min |
| April | 70°F | 44°F | 56.7°F | 0.71 | 0.0 | 5 | <1 | 3 | 13 h 10 min |
| May | 80°F | 53°F | 66.6°F | 0.75 | 0.0 | 5 | 6 | <1 | 14 h 10 min |
| June | 93°F | 63°F | 77.8°F | 0.43 | 0.0 | 2 | 23 | <1 | 14 h 50 min |
| July | 99°F | 70°F | 84.5°F | 0.73 | 0.0 | 5 | 29 | <1 | 14 h 40 min |
| August | 96°F | 68°F | 81.9°F | 0.90 | 0.0 | 6 | 28 | <1 | 13 h 40 min |
| September | 87°F | 58°F | 72.7°F | 0.88 | 0.0 | 5 | 15 | <1 | 12 h 30 min |
| October | 72°F | 44°F | 58.1°F | 1.12 | 0.1 | 6 | 1 | 3 | 11 h 20 min |
| November | 56°F | 33°F | 44.3°F | 0.56 | 0.7 | 4 | <1 | 18 | 10 h 10 min |
| December | 42°F | 24°F | 32.9°F | 0.61 | 3.5 | 4 | <1 | 29 | 9 h 30 min |
| Year (annual) | 71°F | 45°F | 58.0°F | 8.45 | 8.1 | 55 | 101 | 112 |
The same normals in °C and millimetres
| Month | High | Low | Mean | Precip. | Snow |
|---|---|---|---|---|---|
| January | 5°C | −5°C | −0.1°C | 14 mm | 5 cm |
| February | 10°C | −2°C | 4.2°C | 14 mm | 3 cm |
| March | 17°C | 3°C | 9.7°C | 17 mm | 1 cm |
| April | 21°C | 7°C | 13.7°C | 18 mm | 0 cm |
| May | 27°C | 12°C | 19.2°C | 19 mm | 0 cm |
| June | 34°C | 17°C | 25.4°C | 11 mm | 0 cm |
| July | 37°C | 21°C | 29.2°C | 19 mm | 0 cm |
| August | 35°C | 20°C | 27.7°C | 23 mm | 0 cm |
| September | 31°C | 15°C | 22.6°C | 22 mm | 0 cm |
| October | 22°C | 7°C | 14.5°C | 28 mm | 0 cm |
| November | 13°C | 0°C | 6.8°C | 14 mm | 2 cm |
| December | 5°C | −5°C | 0.5°C | 15 mm | 9 cm |
Source: NOAA NCEI 1991-2020 monthly normals, station USC00420336; 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 Arches National Park Headquarters?
Normal highs sit between 65°F and 85°F in April, May and October. Of those, May has the fewest days with rain (5).
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 USC00420336.
When is the last frost at Arches National Park Headquarters?
In Arches National Park Headquarters, the last spring frost (32°F) comes after April 2 in half of years and after April 23 in one year in ten; the first autumn frost comes before October 30 in half of years and before October 12 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 21 year in 10 after April 23; 9 in 10 after March 10
- First autumn frost, half of years before
- October 301 year in 10 before October 12; 9 in 10 before November 14
NOAA puts the median frost-free season at 207 days, and the season without a hard freeze (28°F) at 242 days.
A hard freeze (28°F) comes after March 10 in half of springs and before November 10 in half of autumns.
The USDA's 2023 Plant Hardiness Zone Map puts Arches National Park Headquarters in zone 7a in ZIP code 84532, the nearest ZIP area. By the map's own method, the average of each year's coldest night over 1991-2020, the station is in zone 7b: the coldest night of a typical year reaches 7°F (24 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 Utah · Frost dates by ZIP code
Source: NOAA NCEI 1991-2020 annual normals (frost probabilities), station USC00420336; 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 at Arches National Park Headquarters?
In a normal year in Arches National Park Headquarters, 101 days a year reach 90°F (37 of them 100°F or more), 112 nights fall to 32°F or colder and 55 days bring measurable precipitation.
- Days at 90°F or more
- 101a normal year
- Days at 100°F or more
- 37a normal year
- Nights at 32°F or colder
- 112a normal year
- Days that stay below freezing
- 8high of 32°F or less
- Days with 0.01 inch of precipitation
- 55a normal year
- Days with 1 inch of snow or more
- 4a normal year
The highest temperature in this station's record (since 1980) is 116°F, on July 13, 2003; the lowest is −8°F, on February 7, 1989.
The wettest calendar year on that record is 2006, with 13.41 in; the snowiest season is 1988–89, with 22.3 inches.
Source: NOAA NCEI 1991-2020 annual normals, station USC00420336; records: ACIS (NOAA Regional Climate Centers), station USC00420336. Records use complete months only; a month missing more than three days is left out.
How sunny is it at Arches National Park Headquarters?
Over a year 85% of the sunlight that would reach the ground under clear skies gets through the clouds at Arches National Park Headquarters, 5.3 kWh per square metre a day. June is the sunniest month (91%) and December the cloudiest (76%).
| Month | Share of clear-sky sunshine | Sunshine, kWh/m² a day |
|---|---|---|
| January | 78% | 2.7 |
| February | 77% | 3.6 |
| March | 83% | 5.2 |
| April | 84% | 6.5 |
| May | 86% | 7.5 |
| June | 91% | 8.3 |
| July | 88% | 7.5 |
| August | 87% | 6.7 |
| September | 89% | 5.8 |
| October | 87% | 4.3 |
| November | 84% | 3.1 |
| 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 many heating and cooling degree days does Arches National Park Headquarters record?
A normal year at Arches National Park Headquarters brings 4,449 heating degree days, 17% fewer than the median U.S. place (5,373), and 1,938 cooling degree days, 2.1 times the median (908). Five months need 300 or more heating degree days, a monthly mean of about 55°F or colder. For gardens and crops, NOAA counts 4,703 growing degree days a year above 50°F.
| Month | Heating | Cooling |
|---|---|---|
| January | 1,026 | 0 |
| February | 713 | 0 |
| March | 482 | 1 |
| April | 265 | 15 |
| May | 81 | 129 |
| June | 6 | 388 |
| July | 0 | 605 |
| August | 0 | 523 |
| September | 21 | 252 |
| October | 238 | 26 |
| November | 623 | 0 |
| December | 995 | 0 |
| Year (annual) | 4,449 | 1,938 |
Source: NOAA NCEI 1991-2020 monthly normals, station USC00420336. 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 Arches National Park Headquarters's climate compare?
Arches National Park Headquarters is warmer than 94 of the 97 places with their own NOAA record in Utah, and wetter than 18. Across the 7,247 U.S. stations with normals, its annual mean of 58.0°F is warmer than 69%.
In the Köppen classification computed from these normals, Arches National Park Headquarters is BWk: cold desert. 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 Arches National Park Headquarters's climate
What is the coldest month at Arches National Park Headquarters?
January, with a normal high of 42°F and a normal low of 22°F. The warmest is July (99°F by day, 70°F at night).
Does it snow at Arches National Park Headquarters?
Yes: 8 inches in a normal year, falling on 5 days with 0.1 inch or more, the most in December (3.5 inches).
What is the rainiest month at Arches National Park Headquarters?
October, with 1.12 in of precipitation in a normal year; the driest is June with 0.43 in.
What plant hardiness zone is Arches National Park Headquarters in?
The USDA's 2023 map puts Arches National Park Headquarters in zone 7a in ZIP code 84532, the nearest ZIP area. By the same method at the station, the coldest night of a typical year reaches 7°F (24 years, 1991-2020): zone 7b.
How late can frost come at Arches National Park Headquarters?
In half of years the last 32°F night comes after April 2; in one year in ten it comes after April 23. Waiting until April 23 leaves about a one-in-ten chance of a later frost.
Nearby and next
- Utah climateThe statewide normals and every place in the state
- Moab, UT5 miles from this station, 57.6°F a year
- Moab Canyonland Airport, UT12 miles from this station, 54.1°F a year
- Castle Valley, UT12 miles from this station, 54.7°F a year
- Canyonlands-The Neck, UT16 miles from this station, 53.6°F a year
- Compare two placesMonth by month, side by side
Download these normals (CSV) · JSON · How these figures are made