Leo (6 mi SW), Wyoming climate: Climate normals at a NOAA weather station
Leo (6 mi SW)'s normal year runs from 16°F December nights to 89°F July afternoons, with 11.1 inches of precipitation and 50 inches of snow a year. (NOAA 1991-2020 normals)
In metric: a yearly mean of 7.7°C, December lows of −9°C, July highs of 32°C, 282 mm of precipitation a year.
- NOAA stationLeo (6 mi SW)
- Station IDUSC00485525
- Location42.20°N 106.86°W
- Elevation6,035 ft (1,840 m)
On October 22, the normal high in Leo (6 mi SW) is 58°F and the normal low 30°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 Leo (6 mi SW).
- Jan 36° 14°
- Feb 38° 14°
- Mar 49° 23°
- Apr 58° 29°
- May 69° 37°
- Jun 81° 45°
- Jul 89° 52°
- Aug 87° 50°
- Sep 76° 42°
- Oct 61° 32°
- Nov 47° 24°
- Dec 35° 16°
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 Leo (6 mi SW) each month?
July is the warmest month, with normal highs of 89°F; December the coldest, with normal lows of 16°F. The most precipitation falls in May (1.85 in), the least in January (0.51 in).
| Month | High | Low | Mean | Precip. | Snow | Wet days | 90°F days | Freezing nights | Daylight |
|---|---|---|---|---|---|---|---|---|---|
| January | 36°F | 14°F | 25.1°F | 0.51 | 6.4 | 5 | <1 | 29 | 9 h 20 min |
| February | 38°F | 14°F | 26.3°F | 0.73 | 9.6 | 5 | <1 | 25 | 10 h 30 min |
| March | 49°F | 23°F | 36.0°F | 0.80 | 6.4 | 5 | <1 | 24 | 11 h 50 min |
| April | 58°F | 29°F | 43.4°F | 1.42 | 6.9 | 8 | <1 | 19 | 13 h 20 min |
| May | 69°F | 37°F | 53.0°F | 1.85 | 1.3 | 7 | <1 | 8 | 14 h 30 min |
| June | 81°F | 45°F | 62.8°F | 0.92 | 0.0 | 5 | 7 | 2 | 15 h 10 min |
| July | 89°F | 52°F | 70.3°F | 0.77 | 0.0 | 4 | 17 | <1 | 15 h |
| August | 87°F | 50°F | 68.5°F | 0.62 | 0.0 | 4 | 12 | <1 | 14 h |
| September | 76°F | 42°F | 59.0°F | 0.84 | 1.1 | 5 | 3 | 2 | 12 h 30 min |
| October | 61°F | 32°F | 46.6°F | 1.16 | 3.0 | 5 | <1 | 17 | 11 h 10 min |
| November | 47°F | 24°F | 35.2°F | 0.71 | 6.6 | 4 | <1 | 21 | 9 h 50 min |
| December | 35°F | 16°F | 25.0°F | 0.76 | 8.5 | 6 | <1 | 29 | 9 h 10 min |
| Year (annual) | 60°F | 32°F | 45.9°F | 11.09 | 49.8 | 63 | 38 | 177 |
The same normals in °C and millimetres
| Month | High | Low | Mean | Precip. | Snow |
|---|---|---|---|---|---|
| January | 2°C | −10°C | −3.8°C | 13 mm | 16 cm |
| February | 3°C | −10°C | −3.2°C | 19 mm | 24 cm |
| March | 9°C | −5°C | 2.2°C | 20 mm | 16 cm |
| April | 14°C | −2°C | 6.3°C | 36 mm | 18 cm |
| May | 20°C | 3°C | 11.7°C | 47 mm | 3 cm |
| June | 27°C | 7°C | 17.1°C | 23 mm | 0 cm |
| July | 32°C | 11°C | 21.3°C | 20 mm | 0 cm |
| August | 30°C | 10°C | 20.3°C | 16 mm | 0 cm |
| September | 24°C | 5°C | 15.0°C | 21 mm | 3 cm |
| October | 16°C | 0°C | 8.1°C | 29 mm | 8 cm |
| November | 8°C | −5°C | 1.8°C | 18 mm | 17 cm |
| December | 1°C | −9°C | −3.9°C | 19 mm | 22 cm |
Source: NOAA NCEI 1991-2020 monthly normals, station USC00485525; 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 Leo (6 mi SW)?
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 USC00485525.
When is the last frost at Leo (6 mi SW)?
In Leo (6 mi SW), the last spring frost (32°F) comes after May 20 in half of years and after June 13 in one year in ten; the first autumn frost comes before September 28 in half of years and before September 9 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 201 year in 10 after June 13; 9 in 10 after May 3
- First autumn frost, half of years before
- September 281 year in 10 before September 9; 9 in 10 before October 13
NOAA puts the median frost-free season at 128 days, and the season without a hard freeze (28°F) at 153 days.
A hard freeze (28°F) comes after May 6 in half of springs and before October 8 in half of autumns.
The USDA's 2023 Plant Hardiness Zone Map puts Leo (6 mi SW) in zone 5a in ZIP code 82327, 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 USC00485525; 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 Leo (6 mi SW)?
In a normal year in Leo (6 mi SW), 38 days a year reach 90°F (1 of them 100°F or more), 177 nights fall to 32°F or colder and 63 days bring measurable precipitation.
- Days at 90°F or more
- 38a normal year
- Days at 100°F or more
- 1a normal year
- Nights at 32°F or colder
- 177a normal year
- Days that stay below freezing
- 32high of 32°F or less
- Days with 0.01 inch of precipitation
- 63a normal year
- Days with 1 inch of snow or more
- 17a normal year
The highest temperature in this station's record (since 1930) is 102°F, on July 23, 2014; the lowest is −40°F, on January 17, 1930.
The wettest calendar year on that record is 1946, with 14.47 in; the snowiest season is 1972–73, with 130.7 inches.
Source: NOAA NCEI 1991-2020 annual normals, station USC00485525; records: ACIS (NOAA Regional Climate Centers), station USC00485525. Records use complete months only; a month missing more than three days is left out.
How sunny is it at Leo (6 mi SW)?
Over a year 78% of the sunlight that would reach the ground under clear skies gets through the clouds at Leo (6 mi SW), 4.6 kWh per square metre a day. July is the sunniest month (86%) and December the cloudiest (68%).
| Month | Share of clear-sky sunshine | Sunshine, kWh/m² a day |
|---|---|---|
| January | 73% | 2.1 |
| February | 70% | 3.0 |
| March | 72% | 4.2 |
| April | 72% | 5.4 |
| May | 75% | 6.4 |
| June | 84% | 7.5 |
| July | 86% | 7.3 |
| August | 86% | 6.4 |
| September | 85% | 5.2 |
| October | 77% | 3.5 |
| November | 75% | 2.4 |
| December | 68% | 1.7 |
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 Leo (6 mi SW) record?
A normal year at Leo (6 mi SW) brings 7,310 heating degree days, 36% more than the median U.S. place (5,373), and 385 cooling degree days, 58% 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 2,154 growing degree days a year above 50°F.
| Month | Heating | Cooling |
|---|---|---|
| January | 1,239 | 0 |
| February | 1,085 | 0 |
| March | 899 | 0 |
| April | 648 | 0 |
| May | 377 | 5 |
| June | 114 | 48 |
| July | 11 | 174 |
| August | 30 | 136 |
| September | 202 | 20 |
| October | 572 | 1 |
| November | 894 | 0 |
| December | 1,239 | 0 |
| Year (annual) | 7,310 | 385 |
Source: NOAA NCEI 1991-2020 monthly normals, station USC00485525. 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 Leo (6 mi SW) been warmer than normal?
2025 averaged 48.7°F, 2.8°F above the 1991-2020 normal of 45.9°F. 4 of the 5 complete years since 2021 ran warmer than the normal.
| Year | Mean | Against normal | Precip. | Snow |
|---|---|---|---|---|
| 2021 | 47.5°F | +1.6°F | 10.48 | 49.0 |
| 2022 | 46.1°F | +0.2°F | 10.18 | 55.0 |
| 2023 | 45.4°F | −0.5°F | 12.66 | 79.0 |
| 2024 | 48.6°F | +2.7°F | 7.72 | 34.0 |
| 2025 | 48.7°F | +2.8°F | 11.82 | 46.0 |
Source: observed years: ACIS, station USC00485525. A year counts only with all twelve months complete.
How does Leo (6 mi SW)'s climate compare?
Leo (6 mi SW) is warmer than 52 of the 71 places with their own NOAA record in Wyoming, and wetter than 25. Across the 7,247 U.S. stations with normals, its annual mean of 45.9°F is warmer than 23%.
In the Köppen classification computed from these normals, Leo (6 mi SW) 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 Leo (6 mi SW)'s climate
What is the coldest month at Leo (6 mi SW)?
December, with a normal high of 35°F and a normal low of 16°F. The warmest is July (89°F by day, 52°F at night).
Does it snow at Leo (6 mi SW)?
Yes: 50 inches in a normal year, falling on 21 days with 0.1 inch or more, the most in February (9.6 inches).
What is the rainiest month at Leo (6 mi SW)?
May, with 1.85 in of precipitation in a normal year; the driest is January with 0.51 in.
What plant hardiness zone is Leo (6 mi SW) in?
The USDA's 2023 map puts Leo (6 mi SW) in zone 5a in ZIP code 82327, the nearest ZIP area.
How late can frost come at Leo (6 mi SW)?
In half of years the last 32°F night comes after May 20; in one year in ten it comes after June 13. Waiting until June 13 leaves about a one-in-ten chance of a later frost.
Nearby and next
- Wyoming climateThe statewide normals and every place in the state
- Seminoe Reservoir USBR, WY4 miles from this station, 43.9°F a year
- Pathfinder Dam, WY19 miles from this station, 46.3°F a year
- Rawlins, WY32 miles from this station, 43.1°F a year
- Muddy Gap, WY32 miles from this station, 45.4°F a year
- Compare two placesMonth by month, side by side
Download these normals (CSV) · JSON · How these figures are made