Leiter (9 mi N), Wyoming climate: Climate normals at a NOAA weather station
Leiter (9 mi N)'s normal year runs from 14°F January nights to 89°F July afternoons, with 15.6 inches of precipitation and 53 inches of snow a year. (NOAA 1991-2020 normals)
In metric: a yearly mean of 8.2°C, January lows of −10°C, July highs of 32°C, 395 mm of precipitation a year.
- NOAA stationLeiter (9 mi N)
- Station IDUSC00485506
- Location44.85°N 106.29°W
- Elevation4,160 ft (1,268 m)
On October 23, the normal high in Leiter (9 mi N) is 56°F and the normal low 31°F, and the chance of measurable rain or snow is 24%.
Normals describe a typical year at the station, not a forecast. The National Weather Service forecast for Leiter (9 mi N).
- Jan 35° 14°
- Feb 37° 16°
- Mar 49° 24°
- Apr 57° 32°
- May 67° 41°
- Jun 78° 50°
- Jul 89° 57°
- Aug 88° 56°
- Sep 77° 46°
- Oct 60° 34°
- Nov 46° 23°
- Dec 35° 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 Leiter (9 mi N) each month?
July is the warmest month, with normal highs of 89°F; January the coldest, with normal lows of 14°F. The most precipitation falls in May (2.71 in), the least in February (0.50 in).
| Month | High | Low | Mean | Precip. | Snow | Wet days | 90°F days | Freezing nights | Daylight |
|---|---|---|---|---|---|---|---|---|---|
| January | 35°F | 14°F | 24.2°F | 0.55 | 9.1 | 7 | <1 | 30 | 9 h 10 min |
| February | 37°F | 16°F | 26.6°F | 0.50 | 7.7 | 6 | <1 | 27 | 10 h 20 min |
| March | 49°F | 24°F | 36.8°F | 1.04 | 8.6 | 8 | <1 | 25 | 11 h 50 min |
| April | 57°F | 32°F | 44.6°F | 1.82 | 7.7 | 9 | <1 | 15 | 13 h 30 min |
| May | 67°F | 41°F | 54.0°F | 2.71 | 1.2 | 10 | <1 | 4 | 14 h 50 min |
| June | 78°F | 50°F | 64.0°F | 2.31 | 0.0 | 9 | 4 | <1 | 15 h 30 min |
| July | 89°F | 57°F | 73.0°F | 1.72 | 0.0 | 7 | 16 | <1 | 15 h 20 min |
| August | 88°F | 56°F | 71.7°F | 0.80 | 0.0 | 5 | 15 | <1 | 14 h 10 min |
| September | 77°F | 46°F | 61.5°F | 1.28 | 0.4 | 5 | 4 | 1 | 12 h 40 min |
| October | 60°F | 34°F | 47.0°F | 1.59 | 4.2 | 8 | <1 | 11 | 11 h |
| November | 46°F | 23°F | 34.2°F | 0.65 | 6.4 | 6 | <1 | 25 | 9 h 40 min |
| December | 35°F | 14°F | 24.6°F | 0.58 | 8.1 | 6 | <1 | 30 | 8 h 50 min |
| Year (annual) | 60°F | 34°F | 46.8°F | 15.55 | 53.4 | 87 | 39 | 168 |
The same normals in °C and millimetres
| Month | High | Low | Mean | Precip. | Snow |
|---|---|---|---|---|---|
| January | 2°C | −10°C | −4.3°C | 14 mm | 23 cm |
| February | 3°C | −9°C | −3.0°C | 13 mm | 20 cm |
| March | 10°C | −4°C | 2.7°C | 26 mm | 22 cm |
| April | 14°C | 0°C | 7.0°C | 46 mm | 20 cm |
| May | 19°C | 5°C | 12.2°C | 69 mm | 3 cm |
| June | 26°C | 10°C | 17.8°C | 59 mm | 0 cm |
| July | 32°C | 14°C | 22.8°C | 44 mm | 0 cm |
| August | 31°C | 13°C | 22.1°C | 20 mm | 0 cm |
| September | 25°C | 8°C | 16.4°C | 33 mm | 1 cm |
| October | 15°C | 1°C | 8.3°C | 40 mm | 11 cm |
| November | 8°C | −5°C | 1.2°C | 17 mm | 16 cm |
| December | 2°C | −10°C | −4.1°C | 15 mm | 21 cm |
Source: NOAA NCEI 1991-2020 monthly normals, station USC00485506; 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 Leiter (9 mi N)?
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 USC00485506.
When is the last frost at Leiter (9 mi N)?
In Leiter (9 mi N), the last spring frost (32°F) comes after May 14 in half of years and after May 29 in one year in ten; the first autumn frost comes before September 30 in half of years and before September 17 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 May 29; 9 in 10 after April 30
- First autumn frost, half of years before
- September 301 year in 10 before September 17; 9 in 10 before October 13
NOAA puts the median frost-free season at 137 days, and the season without a hard freeze (28°F) at 157 days.
A hard freeze (28°F) comes after May 2 in half of springs and before October 8 in half of autumns.
The USDA's 2023 Plant Hardiness Zone Map puts Leiter (9 mi N) in zone 5a in ZIP code 82835, 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 5a: the coldest night of a typical year reaches −17°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 USC00485506; 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 Leiter (9 mi N)?
In a normal year in Leiter (9 mi N), 39 days a year reach 90°F (5 of them 100°F or more), 168 nights fall to 32°F or colder and 87 days bring measurable precipitation.
- Days at 90°F or more
- 39a normal year
- Days at 100°F or more
- 5a normal year
- Nights at 32°F or colder
- 168a normal year
- Days that stay below freezing
- 40high of 32°F or less
- Days with 0.01 inch of precipitation
- 87a normal year
- Days with 1 inch of snow or more
- 20a normal year
The highest temperature in this station's record (since 1964) is 111°F, on July 15, 2006; the lowest is −36°F, on December 24, 1983.
The wettest calendar year on that record is 2025, with 20.79 in; the snowiest season is 1989–90, with 92.7 inches.
Source: NOAA NCEI 1991-2020 annual normals, station USC00485506; records: ACIS (NOAA Regional Climate Centers), station USC00485506. Records use complete months only; a month missing more than three days is left out.
How sunny is it at Leiter (9 mi N)?
Over a year 77% of the sunlight that would reach the ground under clear skies gets through the clouds at Leiter (9 mi N), 4.3 kWh per square metre a day. July is the sunniest month (86%) and April the cloudiest (70%).
| Month | Share of clear-sky sunshine | Sunshine, kWh/m² a day |
|---|---|---|
| January | 74% | 1.9 |
| February | 73% | 2.8 |
| March | 72% | 4.0 |
| April | 70% | 5.0 |
| May | 72% | 5.9 |
| June | 80% | 7.0 |
| July | 86% | 7.2 |
| August | 85% | 6.1 |
| September | 82% | 4.8 |
| October | 75% | 3.1 |
| November | 73% | 2.1 |
| December | 70% | 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 Leiter (9 mi N) record?
A normal year at Leiter (9 mi N) brings 7,230 heating degree days, 35% more than the median U.S. place (5,373), and 646 cooling degree days, 29% 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 2,492 growing degree days a year above 50°F.
| Month | Heating | Cooling |
|---|---|---|
| January | 1,265 | 0 |
| February | 1,076 | 0 |
| March | 876 | 0 |
| April | 612 | 0 |
| May | 350 | 8 |
| June | 105 | 77 |
| July | 15 | 264 |
| August | 23 | 232 |
| September | 169 | 62 |
| October | 562 | 3 |
| November | 924 | 0 |
| December | 1,252 | 0 |
| Year (annual) | 7,230 | 646 |
Source: NOAA NCEI 1991-2020 monthly normals, station USC00485506. 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 Leiter (9 mi N) been warmer than normal?
2025 averaged 47.4°F, 0.6°F above the 1991-2020 normal of 46.8°F. 2 of the 4 complete years since 2022 ran warmer than the normal.
| Year | Mean | Against normal | Precip. | Snow |
|---|---|---|---|---|
| 2022 | 46.1°F | −0.7°F | 17.33 | 53.0 |
| 2023 | 46.4°F | −0.4°F | 20.07 | 41.8 |
| 2024 | 49.5°F | +2.7°F | 11.28 | 13.0 |
| 2025 | 47.4°F | +0.6°F | 20.79 | – |
Over 50 complete years from 1965 to 2025, the station's annual mean temperature rose at a fitted 3.2°F per century (+0.18°C per decade). A fitted rate summarizes the whole record; single years swing well above and below it.
Source: observed years: ACIS, station USC00485506; trend: NOAA GHCN-Monthly v4. A year counts only with all twelve months complete.
How does Leiter (9 mi N)'s climate compare?
Leiter (9 mi N) 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 46.8°F is warmer than 27%.
In the Köppen classification computed from these normals, Leiter (9 mi N) 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.
Which places near Leiter (9 mi N) share this climate record?
Arvada 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.
- Arvada, WY9 people · 15 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 Leiter (9 mi N)'s climate
What is the coldest month at Leiter (9 mi N)?
January, with a normal high of 35°F and a normal low of 14°F. The warmest is July (89°F by day, 57°F at night).
Does it snow at Leiter (9 mi N)?
Yes: 53 inches in a normal year, falling on 36 days with 0.1 inch or more, the most in January (9.1 inches).
What is the rainiest month at Leiter (9 mi N)?
May, with 2.71 in of precipitation in a normal year; the driest is February with 0.50 in.
What plant hardiness zone is Leiter (9 mi N) in?
The USDA's 2023 map puts Leiter (9 mi N) in zone 5a in ZIP code 82835, the nearest ZIP area. By the same method at the station, the coldest night of a typical year reaches −17°F (29 years, 1991-2020): zone 5a.
How late can frost come at Leiter (9 mi N)?
In half of years the last 32°F night comes after May 14; in one year in ten it comes after May 29. Waiting until May 29 leaves about a one-in-ten chance of a later frost.
Nearby and next
- Wyoming climateThe statewide normals and every place in the state
- Clearmont, WY21 miles from this station, 43.6°F a year
- Echeta (2 mi NW), WY32 miles from this station, 45.8°F a year
- Sheridan, WY34 miles from this station, 45.4°F a year
- Moorhead (9 mi NE), MT35 miles from this station, 46.2°F a year
- Compare two placesMonth by month, side by side
Download these normals (CSV) · JSON · How these figures are made