Black Mountain, Wyoming climate: Climate normals at a NOAA weather station
Black Mountain's normal year runs from 19°F December nights to 86°F July afternoons, with 15.4 inches of precipitation and 73 inches of snow a year. (NOAA 1991-2020 normals)
In metric: a yearly mean of 8.2°C, December lows of −7°C, July highs of 30°C, 391 mm of precipitation a year.
- NOAA stationBlack Mountain
- Station IDUSC00480778
- Location43.66°N 107.74°W
- Elevation5,635 ft (1,718 m)
On October 23, the normal high in Black Mountain is 52°F and the normal low 34°F, and the chance of measurable rain or snow is 21%.
Normals describe a typical year at the station, not a forecast. The National Weather Service forecast for Black Mountain.
- Jan 35° 19°
- Feb 36° 19°
- Mar 45° 27°
- Apr 52° 33°
- May 63° 43°
- Jun 75° 52°
- Jul 86° 61°
- Aug 84° 59°
- Sep 72° 49°
- Oct 56° 36°
- Nov 43° 27°
- Dec 34° 19°
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 Black Mountain each month?
July is the warmest month, with normal highs of 86°F; December the coldest, with normal lows of 19°F. The most precipitation falls in May (2.73 in), the least in January (0.62 in).
| Month | High | Low | Mean | Precip. | Snow | Wet days | 90°F days | Freezing nights | Daylight |
|---|---|---|---|---|---|---|---|---|---|
| January | 35°F | 19°F | 26.8°F | 0.62 | 8.5 | 6 | <1 | 29 | 9 h 20 min |
| February | 36°F | 19°F | 27.6°F | 0.76 | 10.6 | 7 | <1 | 26 | 10 h 30 min |
| March | 45°F | 27°F | 35.9°F | 1.28 | 8.9 | 7 | <1 | 23 | 11 h 50 min |
| April | 52°F | 33°F | 42.5°F | 2.10 | 14.9 | 10 | <1 | 17 | 13 h 20 min |
| May | 63°F | 43°F | 52.5°F | 2.73 | 2.4 | 10 | <1 | 5 | 14 h 40 min |
| June | 75°F | 52°F | 63.8°F | 1.50 | 0.3 | 7 | 4 | <1 | 15 h 30 min |
| July | 86°F | 61°F | 73.3°F | 0.90 | 0.0 | 6 | 15 | <1 | 15 h 10 min |
| August | 84°F | 59°F | 71.3°F | 0.72 | 0.0 | 6 | 11 | <1 | 14 h |
| September | 72°F | 49°F | 60.4°F | 1.34 | 1.0 | 6 | 1 | 2 | 12 h 30 min |
| October | 56°F | 36°F | 45.9°F | 1.73 | 6.9 | 7 | <1 | 12 | 11 h 10 min |
| November | 43°F | 27°F | 34.7°F | 0.94 | 9.3 | 6 | <1 | 22 | 9 h 40 min |
| December | 34°F | 19°F | 26.5°F | 0.79 | 9.8 | 7 | <1 | 28 | 9 h |
| Year (annual) | 57°F | 37°F | 46.8°F | 15.41 | 72.6 | 83 | 31 | 164 |
The same normals in °C and millimetres
| Month | High | Low | Mean | Precip. | Snow |
|---|---|---|---|---|---|
| January | 2°C | −7°C | −2.9°C | 16 mm | 22 cm |
| February | 2°C | −7°C | −2.4°C | 19 mm | 27 cm |
| March | 7°C | −3°C | 2.2°C | 33 mm | 23 cm |
| April | 11°C | 0°C | 5.8°C | 53 mm | 38 cm |
| May | 17°C | 6°C | 11.4°C | 69 mm | 6 cm |
| June | 24°C | 11°C | 17.7°C | 38 mm | 1 cm |
| July | 30°C | 16°C | 22.9°C | 23 mm | 0 cm |
| August | 29°C | 15°C | 21.8°C | 18 mm | 0 cm |
| September | 22°C | 9°C | 15.8°C | 34 mm | 3 cm |
| October | 13°C | 2°C | 7.7°C | 44 mm | 18 cm |
| November | 6°C | −3°C | 1.5°C | 24 mm | 24 cm |
| December | 1°C | −7°C | −3.1°C | 20 mm | 25 cm |
Source: NOAA NCEI 1991-2020 monthly normals, station USC00480778; 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 Black Mountain?
Normal highs sit between 65°F and 85°F in June, August and September. Of those, August has the fewest days with rain (6).
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 USC00480778.
When is the last frost at Black Mountain?
In Black Mountain, the last spring frost (32°F) comes after May 14 in half of years and after June 1 in one year in ten; the first autumn frost comes before October 3 in half of years and before September 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
- May 141 year in 10 after June 1; 9 in 10 after April 29
- First autumn frost, half of years before
- October 31 year in 10 before September 20; 9 in 10 before October 18
NOAA puts the median frost-free season at 140 days, and the season without a hard freeze (28°F) at 162 days.
A hard freeze (28°F) comes after May 1 in half of springs and before October 12 in half of autumns.
By the USDA's method, the average of each year's coldest night over 1991-2020, the station is in plant hardiness zone 5b: the coldest night of a typical year reaches −12°F (19 complete years).
Frost dates for every NOAA station in Wyoming · Frost dates by ZIP code
Source: NOAA NCEI 1991-2020 annual normals (frost probabilities), station USC00480778; 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 Black Mountain?
In a normal year in Black Mountain, 31 days a year reach 90°F (1 of them 100°F or more), 164 nights fall to 32°F or colder and 83 days bring measurable precipitation.
- Days at 90°F or more
- 31a normal year
- Days at 100°F or more
- 1a normal year
- Nights at 32°F or colder
- 164a normal year
- Days that stay below freezing
- 37high of 32°F or less
- Days with 0.01 inch of precipitation
- 83a normal year
- Days with 1 inch of snow or more
- 25a normal year
The highest temperature in this station's record (since 1963) is 104°F, on July 14, 2002; the lowest is −34°F, on December 10, 1972.
The wettest calendar year on that record is 2017, with 22.47 in; the snowiest season is 1966–67, with 122.5 inches.
Source: NOAA NCEI 1991-2020 annual normals, station USC00480778; records: ACIS (NOAA Regional Climate Centers), station USC00480778. Records use complete months only; a month missing more than three days is left out.
How sunny is it at Black Mountain?
Over a year 80% of the sunlight that would reach the ground under clear skies gets through the clouds at Black Mountain, 4.6 kWh per square metre a day. July is the sunniest month (88%) and December the cloudiest (69%).
| Month | Share of clear-sky sunshine | Sunshine, kWh/m² a day |
|---|---|---|
| January | 74% | 2.0 |
| February | 73% | 2.9 |
| March | 73% | 4.1 |
| April | 72% | 5.3 |
| May | 76% | 6.4 |
| June | 85% | 7.6 |
| July | 88% | 7.5 |
| August | 88% | 6.5 |
| September | 85% | 5.1 |
| October | 77% | 3.4 |
| November | 75% | 2.3 |
| December | 69% | 1.6 |
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 Black Mountain record?
A normal year at Black Mountain brings 7,276 heating degree days, 35% more than the median U.S. place (5,373), and 663 cooling degree days, 27% 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 2,460 growing degree days a year above 50°F.
| Month | Heating | Cooling |
|---|---|---|
| January | 1,184 | 0 |
| February | 1,048 | 0 |
| March | 902 | 0 |
| April | 674 | 1 |
| May | 400 | 13 |
| June | 124 | 88 |
| July | 16 | 274 |
| August | 30 | 223 |
| September | 200 | 61 |
| October | 597 | 4 |
| November | 908 | 0 |
| December | 1,193 | 0 |
| Year (annual) | 7,276 | 663 |
Source: NOAA NCEI 1991-2020 monthly normals, station USC00480778. 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.
Have recent years at Black Mountain been warmer than normal?
2024 averaged 48.5°F, 1.7°F above the 1991-2020 normal of 46.8°F. 3 of the 4 complete years since 2021 ran warmer than the normal.
| Year | Mean | Against normal | Precip. | Snow |
|---|---|---|---|---|
| 2021 | 47.9°F | +1.1°F | 13.49 | 77.8 |
| 2022 | 45.8°F | −1.0°F | 16.31 | 90.0 |
| 2023 | 47.1°F | +0.3°F | 21.83 | 70.6 |
| 2024 | 48.5°F | +1.7°F | 13.91 | 71.5 |
Over 32 complete years from 1965 to 2024, the station's annual mean temperature rose at a fitted 4.9°F per century (+0.27°C per decade). A fitted rate summarizes the whole record; single years swing well above and below it.
Source: observed years: ACIS, station USC00480778; trend: NOAA GHCN-Monthly v4. A year counts only with all twelve months complete.
How does Black Mountain's climate compare?
Black Mountain is warmer than 56 of the 71 places with their own NOAA record in Wyoming, and wetter than 47. Across the 7,247 U.S. stations with normals, its annual mean of 46.8°F is warmer than 27%.
In the Köppen classification computed from these normals, Black Mountain is Dfa: continental, no dry season, hot 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 Black Mountain's climate
What is the coldest month at Black Mountain?
December, with a normal high of 34°F and a normal low of 19°F. The warmest is July (86°F by day, 61°F at night).
Does it snow at Black Mountain?
Yes: 73 inches in a normal year, falling on 37 days with 0.1 inch or more, the most in April (14.9 inches).
What is the rainiest month at Black Mountain?
May, with 2.73 in of precipitation in a normal year; the driest is January with 0.62 in.
What plant hardiness zone is Black Mountain in?
By the same method at the station, the coldest night of a typical year reaches −12°F (19 years, 1991-2020): zone 5b.
How late can frost come at Black Mountain?
In half of years the last 32°F night comes after May 14; in one year in ten it comes after June 1. Waiting until June 1 leaves about a one-in-ten chance of a later frost.
Nearby and next
- Wyoming climateThe statewide normals and every place in the state
- Tensleep (16 mi SSE), WY22 miles from this station, 42.1°F a year
- Thermopolis, WY24 miles from this station, 48.6°F a year
- Worland, WY24 miles from this station, 44.6°F a year
- Boysen Dam, WY27 miles from this station, 46.4°F a year
- Compare two placesMonth by month, side by side
Download these normals (CSV) · JSON · How these figures are made