Basin, Wyoming climate: Normal weather by month, frost dates and records
Basin's normal year runs from 9°F January nights to 93°F July afternoons, with 7.2 inches of precipitation and 20 inches of snow a year. (NOAA 1991-2020 normals)
In metric: a yearly mean of 9.4°C, January lows of −13°C, July highs of 34°C, 182 mm of precipitation a year.
- NOAA stationBasin
- Station IDUSC00480540
- Location44.38°N 108.03°W
- Elevation3,840 ft (1,170 m)
- Population1,337
On October 23, the normal high in Basin is 59°F and the normal low 33°F, and the chance of measurable rain or snow is 12%.
Normals describe a typical year at the station, not a forecast. The National Weather Service forecast for Basin.
- Jan 32° 9°
- Feb 39° 15°
- Mar 54° 27°
- Apr 63° 37°
- May 73° 47°
- Jun 84° 55°
- Jul 93° 60°
- Aug 91° 57°
- Sep 79° 48°
- Oct 63° 36°
- Nov 46° 23°
- Dec 34° 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 Basin each month?
July is the warmest month, with normal highs of 93°F; January the coldest, with normal lows of 9°F. The most precipitation falls in May (1.37 in), the least in January (0.24 in).
| Month | High | Low | Mean | Precip. | Snow | Wet days | 90°F days | Freezing nights | Daylight |
|---|---|---|---|---|---|---|---|---|---|
| January | 32°F | 9°F | 20.6°F | 0.24 | 3.4 | 3 | <1 | 31 | 9 h 10 min |
| February | 39°F | 15°F | 26.8°F | 0.32 | 4.1 | 4 | <1 | 28 | 10 h 30 min |
| March | 54°F | 27°F | 40.7°F | 0.31 | 2.3 | 3 | <1 | 26 | 11 h 50 min |
| April | 63°F | 37°F | 49.8°F | 0.75 | 1.5 | 5 | <1 | 14 | 13 h 20 min |
| May | 73°F | 47°F | 59.8°F | 1.37 | 0.1 | 7 | 1 | 3 | 14 h 40 min |
| June | 84°F | 55°F | 69.2°F | 1.04 | 0.0 | 6 | 7 | <1 | 15 h 30 min |
| July | 93°F | 60°F | 76.5°F | 0.41 | 0.0 | 3 | 20 | <1 | 15 h 10 min |
| August | 91°F | 57°F | 74.1°F | 0.32 | 0.0 | 4 | 17 | <1 | 14 h 10 min |
| September | 79°F | 48°F | 63.4°F | 0.95 | 0.2 | 5 | 4 | 2 | 12 h 40 min |
| October | 63°F | 36°F | 49.2°F | 0.79 | 1.5 | 4 | <1 | 15 | 11 h |
| November | 46°F | 23°F | 34.6°F | 0.36 | 3.0 | 3 | <1 | 28 | 9 h 40 min |
| December | 34°F | 11°F | 22.6°F | 0.30 | 4.0 | 3 | <1 | 31 | 8 h 50 min |
| Year (annual) | 63°F | 35°F | 48.9°F | 7.16 | 20.1 | 50 | 49 | 176 |
The same normals in °C and millimetres
| Month | High | Low | Mean | Precip. | Snow |
|---|---|---|---|---|---|
| January | 0°C | −13°C | −6.3°C | 6 mm | 9 cm |
| February | 4°C | −10°C | −2.9°C | 8 mm | 10 cm |
| March | 12°C | −3°C | 4.8°C | 8 mm | 6 cm |
| April | 17°C | 3°C | 9.9°C | 19 mm | 4 cm |
| May | 23°C | 8°C | 15.4°C | 35 mm | 0 cm |
| June | 29°C | 13°C | 20.7°C | 26 mm | 0 cm |
| July | 34°C | 16°C | 24.7°C | 10 mm | 0 cm |
| August | 33°C | 14°C | 23.4°C | 8 mm | 0 cm |
| September | 26°C | 9°C | 17.4°C | 24 mm | 1 cm |
| October | 17°C | 2°C | 9.6°C | 20 mm | 4 cm |
| November | 8°C | −5°C | 1.4°C | 9 mm | 8 cm |
| December | 1°C | −11°C | −5.2°C | 8 mm | 10 cm |
Source: NOAA NCEI 1991-2020 monthly normals, station USC00480540; 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 Basin?
Normal highs sit between 65°F and 85°F in May, June and September. Of those, September 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 USC00480540.
When is the last frost in Basin?
In Basin, the last spring frost (32°F) comes after April 28 in half of years and after May 11 in one year in ten; the first autumn frost comes before October 10 in half of years and before September 26 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 281 year in 10 after May 11; 9 in 10 after April 15
- First autumn frost, half of years before
- October 101 year in 10 before September 26; 9 in 10 before October 22
NOAA puts the median frost-free season at 164 days, and the season without a hard freeze (28°F) at 187 days.
A hard freeze (28°F) comes after April 17 in half of springs and before October 20 in half of autumns.
The USDA's 2023 Plant Hardiness Zone Map puts Basin in zone 4b in ZIP code 82410, the nearest ZIP area. By the map's own method, the average of each year's coldest night over 1991-2020, Basin's NOAA station is in zone 4b: the coldest night of a typical year reaches −22°F (29 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 USC00480540; 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 in Basin?
In a normal year in Basin, 49 days a year reach 90°F (5 of them 100°F or more), 176 nights fall to 32°F or colder and 50 days bring measurable precipitation.
- Days at 90°F or more
- 49a normal year
- Days at 100°F or more
- 5a normal year
- Nights at 32°F or colder
- 176a normal year
- Days that stay below freezing
- 46high of 32°F or less
- Days with 0.01 inch of precipitation
- 50a normal year
- Days with 1 inch of snow or more
- 11a normal year
The highest temperature in this station's record (since 1898) is 115°F, on August 8, 1983; the lowest is −43°F, on January 30, 1951.
The wettest calendar year on that record is 2011, with 10.84 in; the snowiest season is 1958–59, with 38.5 inches.
Source: NOAA NCEI 1991-2020 annual normals, station USC00480540; records: ACIS (NOAA Regional Climate Centers), station USC00480540. Records use complete months only; a month missing more than three days is left out.
How sunny is Basin?
Over a year 78% of the sunlight that would reach the ground under clear skies gets through the clouds in the area around Basin, 4.4 kWh per square metre a day. July is the sunniest month (87%) and December the cloudiest (65%).
| Month | Share of clear-sky sunshine | Sunshine, kWh/m² a day |
|---|---|---|
| January | 71% | 1.8 |
| February | 72% | 2.8 |
| March | 74% | 4.0 |
| April | 74% | 5.3 |
| May | 75% | 6.3 |
| June | 82% | 7.2 |
| July | 87% | 7.3 |
| August | 85% | 6.2 |
| September | 83% | 4.8 |
| October | 76% | 3.2 |
| November | 72% | 2.0 |
| December | 65% | 1.4 |
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 Basin need?
A normal year in Basin brings 6,765 heating degree days, 26% more than the median U.S. place (5,373), and 950 cooling degree days, 5% more than the median (908). Seven months need 300 or more heating degree days, a monthly mean of about 55°F or colder. For gardens and crops, NOAA counts 3,112 growing degree days a year above 50°F.
| Month | Heating | Cooling |
|---|---|---|
| January | 1,376 | 0 |
| February | 1,068 | 0 |
| March | 752 | 0 |
| April | 460 | 3 |
| May | 205 | 44 |
| June | 42 | 168 |
| July | 4 | 360 |
| August | 11 | 293 |
| September | 127 | 78 |
| October | 494 | 4 |
| November | 912 | 0 |
| December | 1,314 | 0 |
| Year (annual) | 6,765 | 950 |
Source: NOAA NCEI 1991-2020 monthly normals, station USC00480540. 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.
Has Basin been warmer than normal lately?
2024 averaged 49.9°F, 1.0°F above the 1991-2020 normal of 48.9°F. 2 of the 4 complete years since 2021 ran warmer than the normal.
| Year | Mean | Against normal | Precip. | Snow |
|---|---|---|---|---|
| 2021 | 49.6°F | +0.7°F | 5.15 | 30.8 |
| 2022 | 46.7°F | −2.2°F | 7.48 | 20.1 |
| 2023 | 47.0°F | −1.9°F | 9.97 | 29.0 |
| 2024 | 49.9°F | +1.0°F | 6.04 | 8.0 |
Over 95 complete years from 1900 to 2024, the station's annual mean temperature rose at a fitted 2.6°F per century (+0.15°C per decade). A fitted rate summarizes the whole record; single years swing well above and below it.
Source: observed years: ACIS, station USC00480540; trend: NOAA GHCN-Monthly v4. A year counts only with all twelve months complete.
How does Basin's climate compare?
Basin is warmer than 67 of the other 70 places with their own NOAA record in Wyoming, and wetter than 4. Across the 7,247 U.S. stations with normals, its annual mean of 48.9°F is warmer than 36%.
In the Köppen classification computed from these normals, Basin 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.
Which places near Basin share this climate record?
Manderson has no NOAA station with 1991-2020 normals of its own, and this station is the nearest full record. A place's own climate can differ from these figures, by several degrees where it sits much higher or lower than the station, nearer the coast, or inside a large city's heat; for the larger places the next nearest records are named with their yearly mean, so the spread around them is visible, and places of 50,000 or more have their own page with NOAA's gridded normals.
- Manderson, WY89 people · 8 mi SE
Source: Census Bureau 2024 Gazetteer (place centers) and Vintage 2024 population estimates. Distance and direction from the station to each place's center.
Questions about Basin's climate
What is the coldest month in Basin?
January, with a normal high of 32°F and a normal low of 9°F. The warmest is July (93°F by day, 60°F at night).
Does it snow in Basin?
Yes: 20 inches in a normal year, falling on 12 days with 0.1 inch or more, the most in February (4.1 inches).
What is the rainiest month in Basin?
May, with 1.37 in of precipitation in a normal year; the driest is January with 0.24 in.
What plant hardiness zone is Basin in?
The USDA's 2023 map puts Basin in zone 4b in ZIP code 82410, the nearest ZIP area. By the same method at Basin's NOAA station, the coldest night of a typical year reaches −22°F (29 years, 1991-2020): zone 4b.
How late can frost come in Basin?
In half of years the last 32°F night comes after April 28; in one year in ten it comes after May 11. Waiting until May 11 leaves about a one-in-ten chance of a later frost.
Nearby and next
- Wyoming climateThe statewide normals and every place in the state
- Greybull, WY10 miles from this station, 46.2°F a year
- Shell, WY17 miles from this station, 44.8°F a year
- Emblem, WY19 miles from this station, 44.9°F a year
- Worland, WY29 miles from this station, 44.6°F a year
- Compare two placesMonth by month, side by side
Download these normals (CSV) · JSON · How these figures are made