Archer, Wyoming climate: Climate normals at a NOAA weather station
Archer's normal year runs from 14°F December nights to 88°F July afternoons, with 16.1 inches of precipitation and 47 inches of snow a year. (NOAA 1991-2020 normals)
In metric: a yearly mean of 8.2°C, December lows of −10°C, July highs of 31°C, 410 mm of precipitation a year.
- NOAA stationArcher
- Station IDUSC00480270
- Location41.15°N 104.66°W
- Elevation6,010 ft (1,832 m)
On October 12, the normal high in Archer is 64°F and the normal low 32°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 Archer.
- Jan 42° 15°
- Feb 43° 15°
- Mar 52° 22°
- Apr 58° 28°
- May 67° 38°
- Jun 79° 46°
- Jul 88° 52°
- Aug 85° 50°
- Sep 77° 42°
- Oct 63° 30°
- Nov 51° 21°
- Dec 42° 14°
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 Archer each month?
July is the warmest month, with normal highs of 88°F; December the coldest, with normal lows of 14°F. The most precipitation falls in May (2.83 in), the least in January (0.33 in).
| Month | High | Low | Mean | Precip. | Snow | Wet days | 90°F days | Freezing nights | Daylight |
|---|---|---|---|---|---|---|---|---|---|
| January | 42°F | 15°F | 28.3°F | 0.33 | 5.6 | 4 | <1 | 31 | 9 h 30 min |
| February | 43°F | 15°F | 29.4°F | 0.45 | 6.2 | 5 | <1 | 27 | 10 h 40 min |
| March | 52°F | 22°F | 37.0°F | 0.91 | 8.0 | 7 | <1 | 28 | 11 h 50 min |
| April | 58°F | 28°F | 43.1°F | 1.45 | 7.1 | 8 | <1 | 22 | 13 h 20 min |
| May | 67°F | 38°F | 52.4°F | 2.83 | 1.7 | 11 | 1 | 8 | 14 h 30 min |
| June | 79°F | 46°F | 62.6°F | 2.70 | 0.0 | 11 | 3 | 1 | 15 h 10 min |
| July | 88°F | 52°F | 70.0°F | 1.87 | 0.0 | 10 | 12 | <1 | 14 h 50 min |
| August | 85°F | 50°F | 67.6°F | 1.78 | 0.0 | 10 | 9 | <1 | 13 h 50 min |
| September | 77°F | 42°F | 59.6°F | 1.57 | 1.2 | 8 | 2 | 4 | 12 h 30 min |
| October | 63°F | 30°F | 46.6°F | 1.08 | 4.1 | 6 | <1 | 19 | 11 h 10 min |
| November | 51°F | 21°F | 35.9°F | 0.64 | 7.6 | 6 | <1 | 28 | 10 h |
| December | 42°F | 14°F | 28.1°F | 0.53 | 5.6 | 4 | <1 | 30 | 9 h 10 min |
| Year (annual) | 62°F | 31°F | 46.7°F | 16.14 | 47.1 | 90 | 26 | 196 |
The same normals in °C and millimetres
| Month | High | Low | Mean | Precip. | Snow |
|---|---|---|---|---|---|
| January | 6°C | −10°C | −2.1°C | 8 mm | 14 cm |
| February | 6°C | −9°C | −1.4°C | 11 mm | 16 cm |
| March | 11°C | −5°C | 2.8°C | 23 mm | 20 cm |
| April | 15°C | −2°C | 6.2°C | 37 mm | 18 cm |
| May | 19°C | 3°C | 11.3°C | 72 mm | 4 cm |
| June | 26°C | 8°C | 17.0°C | 69 mm | 0 cm |
| July | 31°C | 11°C | 21.1°C | 47 mm | 0 cm |
| August | 30°C | 10°C | 19.8°C | 45 mm | 0 cm |
| September | 25°C | 6°C | 15.3°C | 40 mm | 3 cm |
| October | 17°C | −1°C | 8.1°C | 27 mm | 10 cm |
| November | 11°C | −6°C | 2.2°C | 16 mm | 19 cm |
| December | 6°C | −10°C | −2.2°C | 13 mm | 14 cm |
Source: NOAA NCEI 1991-2020 monthly normals, station USC00480270; 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 Archer?
Normal highs sit between 65°F and 85°F in May, June and September. Of those, September has the fewest days with rain (8).
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 USC00480270.
When is the last frost at Archer?
In Archer, the last spring frost (32°F) comes after May 21 in half of years and after June 6 in one year in ten; the first autumn frost comes before September 24 in half of years and before September 8 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 211 year in 10 after June 6; 9 in 10 after May 8
- First autumn frost, half of years before
- September 241 year in 10 before September 8; 9 in 10 before October 5
NOAA puts the median frost-free season at 124 days, and the season without a hard freeze (28°F) at 144 days.
A hard freeze (28°F) comes after May 9 in half of springs and before October 1 in half of autumns.
The USDA's 2023 Plant Hardiness Zone Map puts Archer in zone 5b in ZIP code 82007, the nearest ZIP area.
Frost dates for every NOAA station in Wyoming · Frost dates by ZIP code
Source: NOAA NCEI 1991-2020 annual normals (frost probabilities), station USC00480270; 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 Archer?
In a normal year in Archer, 26 days a year reach 90°F (1 of them 100°F or more), 196 nights fall to 32°F or colder and 90 days bring measurable precipitation.
- Days at 90°F or more
- 26a normal year
- Days at 100°F or more
- 1a normal year
- Nights at 32°F or colder
- 196a normal year
- Days that stay below freezing
- 28high of 32°F or less
- Days with 0.01 inch of precipitation
- 90a normal year
- Days with 1 inch of snow or more
- 17a normal year
The highest temperature in this station's record (since 1915) is 104°F, on June 24, 1954; the lowest is −30°F, on December 22, 1990.
The wettest calendar year on that record is 1983, with 26.77 in; the snowiest season is 1983–84, with 97.0 inches.
Source: NOAA NCEI 1991-2020 annual normals, station USC00480270; records: ACIS (NOAA Regional Climate Centers), station USC00480270. Records use complete months only; a month missing more than three days is left out.
How sunny is it at Archer?
Over a year 78% of the sunlight that would reach the ground under clear skies gets through the clouds at Archer, 4.6 kWh per square metre a day. August is the sunniest month (83%) and April the cloudiest (72%).
| Month | Share of clear-sky sunshine | Sunshine, kWh/m² a day |
|---|---|---|
| January | 77% | 2.3 |
| February | 75% | 3.2 |
| March | 76% | 4.5 |
| April | 72% | 5.4 |
| May | 73% | 6.1 |
| June | 81% | 7.1 |
| July | 83% | 6.9 |
| August | 83% | 6.1 |
| September | 83% | 5.0 |
| October | 78% | 3.6 |
| November | 78% | 2.5 |
| December | 75% | 2.0 |
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 Archer record?
A normal year at Archer brings 7,023 heating degree days, 31% more than the median U.S. place (5,373), and 389 cooling degree days, 57% 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 2,137 growing degree days a year above 50°F.
| Month | Heating | Cooling |
|---|---|---|
| January | 1,136 | 0 |
| February | 996 | 0 |
| March | 868 | 0 |
| April | 657 | 0 |
| May | 394 | 5 |
| June | 129 | 57 |
| July | 24 | 178 |
| August | 37 | 117 |
| September | 194 | 30 |
| October | 570 | 1 |
| November | 874 | 0 |
| December | 1,144 | 0 |
| Year (annual) | 7,023 | 389 |
Source: NOAA NCEI 1991-2020 monthly normals, station USC00480270. 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 Archer's climate compare?
Archer is warmer than 56 of the 71 places with their own NOAA record in Wyoming, and wetter than 48. Across the 7,247 U.S. stations with normals, its annual mean of 46.7°F is warmer than 26%.
In the Köppen classification computed from these normals, Archer 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 Archer's climate
What is the coldest month at Archer?
December, with a normal high of 42°F and a normal low of 14°F. The warmest is July (88°F by day, 52°F at night).
Does it snow at Archer?
Yes: 47 inches in a normal year, falling on 30 days with 0.1 inch or more, the most in March (8.0 inches).
What is the rainiest month at Archer?
May, with 2.83 in of precipitation in a normal year; the driest is January with 0.33 in.
What plant hardiness zone is Archer in?
The USDA's 2023 map puts Archer in zone 5b in ZIP code 82007, the nearest ZIP area.
How late can frost come at Archer?
In half of years the last 32°F night comes after May 21; in one year in ten it comes after June 6. Waiting until June 6 leaves about a one-in-ten chance of a later frost.
Nearby and next
- Wyoming climateThe statewide normals and every place in the state
- Cheyenne, WY7 miles from this station, 46.9°F a year
- Carpenter, WY16 miles from this station, 46.9°F a year
- Nunn, CO24 miles from this station, 47.3°F a year
- Hecla (1 mi E), WY27 miles from this station, 45.0°F a year
- Compare two placesMonth by month, side by side
Download these normals (CSV) · JSON · How these figures are made