Old Fort Laramie, Wyoming climate: Climate normals at a NOAA weather station
Old Fort Laramie's normal year runs from 15°F December nights to 91°F July afternoons, with 14.9 inches of precipitation and 28 inches of snow a year. (NOAA 1991-2020 normals)
In metric: a yearly mean of 9.5°C, December lows of −9°C, July highs of 33°C, 379 mm of precipitation a year.
- NOAA stationOld Fort Laramie
- Station IDUSC00486852
- Location42.21°N 104.56°W
- Elevation4,250 ft (1,295 m)
On October 23, the normal high in Old Fort Laramie is 62°F and the normal low 28°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 Old Fort Laramie.
- Jan 43° 15°
- Feb 45° 17°
- Mar 55° 24°
- Apr 62° 30°
- May 71° 41°
- Jun 83° 50°
- Jul 91° 57°
- Aug 89° 54°
- Sep 80° 44°
- Oct 65° 31°
- Nov 52° 22°
- Dec 43° 15°
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 Old Fort Laramie each month?
July is the warmest month, with normal highs of 91°F; December the coldest, with normal lows of 15°F. The most precipitation falls in May (2.93 in), the least in January (0.24 in).
| Month | High | Low | Mean | Precip. | Snow | Wet days | 90°F days | Freezing nights | Daylight |
|---|---|---|---|---|---|---|---|---|---|
| January | 43°F | 15°F | 29.1°F | 0.24 | 2.2 | 4 | <1 | 30 | 9 h 20 min |
| February | 45°F | 17°F | 31.0°F | 0.53 | 6.3 | 5 | <1 | 27 | 10 h 30 min |
| March | 55°F | 24°F | 39.1°F | 0.80 | 3.1 | 5 | <1 | 28 | 11 h 50 min |
| April | 62°F | 30°F | 46.0°F | 1.71 | 3.5 | 7 | <1 | 21 | 13 h 20 min |
| May | 71°F | 41°F | 55.8°F | 2.93 | 0.6 | 10 | 1 | 7 | 14 h 30 min |
| June | 83°F | 50°F | 66.4°F | 2.19 | 0.0 | 8 | 7 | <1 | 15 h 10 min |
| July | 91°F | 57°F | 73.8°F | 1.78 | 0.0 | 7 | 17 | <1 | 15 h |
| August | 89°F | 54°F | 71.6°F | 1.36 | 0.0 | 6 | 15 | <1 | 14 h |
| September | 80°F | 44°F | 61.8°F | 1.39 | 0.0 | 6 | 5 | 4 | 12 h 30 min |
| October | 65°F | 31°F | 48.2°F | 1.13 | 2.4 | 6 | <1 | 21 | 11 h 10 min |
| November | 52°F | 22°F | 37.0°F | 0.46 | 3.2 | 4 | <1 | 28 | 9 h 50 min |
| December | 43°F | 15°F | 29.0°F | 0.42 | 6.2 | 4 | <1 | 30 | 9 h 10 min |
| Year (annual) | 65°F | 33°F | 49.1°F | 14.94 | 27.5 | 70 | 45 | 196 |
The same normals in °C and millimetres
| Month | High | Low | Mean | Precip. | Snow |
|---|---|---|---|---|---|
| January | 6°C | −9°C | −1.6°C | 6 mm | 6 cm |
| February | 7°C | −8°C | −0.6°C | 13 mm | 16 cm |
| March | 13°C | −5°C | 3.9°C | 20 mm | 8 cm |
| April | 17°C | −1°C | 7.8°C | 43 mm | 9 cm |
| May | 22°C | 5°C | 13.2°C | 74 mm | 2 cm |
| June | 28°C | 10°C | 19.1°C | 56 mm | 0 cm |
| July | 33°C | 14°C | 23.2°C | 45 mm | 0 cm |
| August | 32°C | 12°C | 22.0°C | 35 mm | 0 cm |
| September | 27°C | 7°C | 16.6°C | 35 mm | 0 cm |
| October | 18°C | 0°C | 9.0°C | 29 mm | 6 cm |
| November | 11°C | −5°C | 2.8°C | 12 mm | 8 cm |
| December | 6°C | −9°C | −1.7°C | 11 mm | 16 cm |
Source: NOAA NCEI 1991-2020 monthly normals, station USC00486852; 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 Old Fort Laramie?
Normal highs sit between 65°F and 85°F in May, June, September and October. Of those, September 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 USC00486852.
When is the last frost at Old Fort Laramie?
In Old Fort Laramie, the last spring frost (32°F) comes after May 14 in half of years and after May 27 in one year in ten; the first autumn frost comes before September 26 in half of years and before September 12 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 27; 9 in 10 after May 3
- First autumn frost, half of years before
- September 261 year in 10 before September 12; 9 in 10 before October 7
NOAA puts the median frost-free season at 134 days, and the season without a hard freeze (28°F) at 153 days.
A hard freeze (28°F) comes after May 3 in half of springs and before October 5 in half of autumns.
The USDA's 2023 Plant Hardiness Zone Map puts Old Fort Laramie in zone 5a in ZIP code 82212, 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 4b: the coldest night of a typical year reaches −21°F (26 complete years); the map interpolates between stations and terrain, so the station and the ZIP area can differ by half a zone.
Frost dates for every NOAA station in Wyoming · Frost dates by ZIP code
Source: NOAA NCEI 1991-2020 annual normals (frost probabilities), station USC00486852; 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 Old Fort Laramie?
In a normal year in Old Fort Laramie, 45 days a year reach 90°F (4 of them 100°F or more), 196 nights fall to 32°F or colder and 70 days bring measurable precipitation.
- Days at 90°F or more
- 45a normal year
- Days at 100°F or more
- 4a normal year
- Nights at 32°F or colder
- 196a normal year
- Days that stay below freezing
- 27high of 32°F or less
- Days with 0.01 inch of precipitation
- 70a normal year
- Days with 1 inch of snow or more
- 10a normal year
The highest temperature in this station's record (since 1989) is 108°F, on July 26, 2026; the lowest is −40°F, on December 22, 1989.
The wettest calendar year on that record is 2019, with 19.23 in; the snowiest season is 2020–21, with 72.5 inches.
Source: NOAA NCEI 1991-2020 annual normals, station USC00486852; records: ACIS (NOAA Regional Climate Centers), station USC00486852. Records use complete months only; a month missing more than three days is left out.
How sunny is it at Old Fort Laramie?
Over a year 78% of the sunlight that would reach the ground under clear skies gets through the clouds at Old Fort Laramie, 4.5 kWh per square metre a day. July is the sunniest month (86%) and February the cloudiest (72%).
| Month | Share of clear-sky sunshine | Sunshine, kWh/m² a day |
|---|---|---|
| January | 75% | 2.1 |
| February | 72% | 2.9 |
| March | 73% | 4.2 |
| April | 72% | 5.2 |
| May | 74% | 6.2 |
| June | 82% | 7.2 |
| July | 86% | 7.1 |
| August | 86% | 6.3 |
| September | 84% | 5.0 |
| October | 77% | 3.4 |
| November | 76% | 2.4 |
| December | 72% | 1.8 |
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 Old Fort Laramie record?
A normal year at Old Fort Laramie brings 6,448 heating degree days, 20% more than the median U.S. place (5,373), and 676 cooling degree days, 26% 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 2,654 growing degree days a year above 50°F.
| Month | Heating | Cooling |
|---|---|---|
| January | 1,111 | 0 |
| February | 950 | 0 |
| March | 801 | 0 |
| April | 570 | 0 |
| May | 300 | 15 |
| June | 64 | 106 |
| July | 6 | 277 |
| August | 16 | 222 |
| September | 150 | 54 |
| October | 523 | 0 |
| November | 839 | 0 |
| December | 1,116 | 0 |
| Year (annual) | 6,448 | 676 |
Source: NOAA NCEI 1991-2020 monthly normals, station USC00486852. 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 Old Fort Laramie been warmer than normal?
2024 averaged 51.3°F, 2.1°F above the 1991-2020 normal of 49.1°F. 1 of the 3 complete years since 2022 ran warmer than the normal.
| Year | Mean | Against normal | Precip. | Snow |
|---|---|---|---|---|
| 2022 | 48.7°F | −0.4°F | 11.66 | 42.7 |
| 2023 | 48.6°F | −0.5°F | 18.92 | 62.1 |
| 2024 | 51.3°F | +2.1°F | 9.51 | 10.0 |
Source: observed years: ACIS, station USC00486852. A year counts only with all twelve months complete.
How does Old Fort Laramie's climate compare?
Old Fort Laramie is warmer than 69 of the 71 places with their own NOAA record in Wyoming, and wetter than 44. Across the 7,247 U.S. stations with normals, its annual mean of 49.1°F is warmer than 36%.
In the Köppen classification computed from these normals, Old Fort Laramie 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 Old Fort Laramie share this climate record?
Fort Laramie 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.
- Fort Laramie, WY222 people · 2 mi E
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 Old Fort Laramie's climate
What is the coldest month at Old Fort Laramie?
December, with a normal high of 43°F and a normal low of 15°F. The warmest is July (91°F by day, 57°F at night).
Does it snow at Old Fort Laramie?
Yes: 28 inches in a normal year, falling on 14 days with 0.1 inch or more, the most in February (6.3 inches).
What is the rainiest month at Old Fort Laramie?
May, with 2.93 in of precipitation in a normal year; the driest is January with 0.24 in.
What plant hardiness zone is Old Fort Laramie in?
The USDA's 2023 map puts Old Fort Laramie in zone 5a in ZIP code 82212, the nearest ZIP area. By the same method at the station, the coldest night of a typical year reaches −21°F (26 years, 1991-2020): zone 4b.
How late can frost come at Old Fort Laramie?
In half of years the last 32°F night comes after May 14; in one year in ten it comes after May 27. Waiting until May 27 leaves about a one-in-ten chance of a later frost.
Nearby and next
- Wyoming climateThe statewide normals and every place in the state
- Whalen Dam USBR, WY5 miles from this station, 48.1°F a year
- Lingle, WY10 miles from this station, 46.9°F a year
- Guernsey, WY12 miles from this station, 48.7°F a year
- Wheatland, WY21 miles from this station, 49.0°F a year
- Compare two placesMonth by month, side by side
Download these normals (CSV) · JSON · How these figures are made