Seminoe Reservoir USBR, Wyoming climate: Climate normals at a NOAA weather station
Seminoe Reservoir USBR's normal year runs from 14°F January nights to 84°F July afternoons, with 13.2 inches of precipitation a year. (NOAA 1991-2020 normals)
In metric: a yearly mean of 6.6°C, January lows of −10°C, July highs of 29°C, 335 mm of precipitation a year.
- NOAA stationSeminoe Reservoir USBR
- Station IDUSC00488074
- Location42.16°N 106.91°W
- Elevation6,975 ft (2,126 m)
On October 23, the normal high in Seminoe Reservoir USBR is 51°F and the normal low 31°F.
Normals describe a typical year at the station, not a forecast. The National Weather Service forecast for Seminoe Reservoir USBR.
- Jan 31° 14°
- Feb 34° 15°
- Mar 43° 23°
- Apr 52° 30°
- May 62° 39°
- Jun 75° 49°
- Jul 84° 57°
- Aug 81° 54°
- Sep 70° 45°
- Oct 55° 33°
- Nov 41° 23°
- Dec 31° 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 Seminoe Reservoir USBR each month?
July is the warmest month, with normal highs of 84°F; January the coldest, with normal lows of 14°F. The most precipitation falls in May (2.14 in), the least in December (0.39 in).
| Month | High | Low | Mean | Precip. | Wet days | 90°F days | Freezing nights | Daylight |
|---|---|---|---|---|---|---|---|---|
| January | 31°F | 14°F | 22.4°F | 0.51 | – | <1 | 31 | 9 h 30 min |
| February | 34°F | 15°F | 24.5°F | 0.72 | – | <1 | 27 | 10 h 30 min |
| March | 43°F | 23°F | 33.0°F | 1.32 | – | <1 | 24 | 11 h 50 min |
| April | 52°F | 30°F | 40.7°F | 1.84 | – | <1 | 19 | 13 h 20 min |
| May | 62°F | 39°F | 50.4°F | 2.14 | – | <1 | 6 | 14 h 30 min |
| June | 75°F | 49°F | 61.7°F | 1.44 | – | 1 | <1 | 15 h 10 min |
| July | 84°F | 57°F | 70.3°F | 0.85 | – | 5 | <1 | 15 h |
| August | 81°F | 54°F | 67.8°F | 0.90 | – | 2 | <1 | 14 h |
| September | 70°F | 45°F | 57.6°F | 1.00 | – | <1 | 1 | 12 h 30 min |
| October | 55°F | 33°F | 43.9°F | 1.37 | – | <1 | 13 | 11 h 10 min |
| November | 41°F | 23°F | 31.9°F | 0.71 | – | <1 | 23 | 9 h 50 min |
| December | 31°F | 14°F | 22.6°F | 0.39 | – | <1 | 29 | 9 h 10 min |
| Year (annual) | 55°F | 33°F | 43.9°F | 13.19 | – | 8 | 173 |
The same normals in °C and millimetres
| Month | High | Low | Mean | Precip. |
|---|---|---|---|---|
| January | 0°C | −10°C | −5.3°C | 13 mm |
| February | 1°C | −10°C | −4.2°C | 18 mm |
| March | 6°C | −5°C | 0.6°C | 34 mm |
| April | 11°C | −1°C | 4.8°C | 47 mm |
| May | 17°C | 4°C | 10.2°C | 54 mm |
| June | 24°C | 9°C | 16.5°C | 37 mm |
| July | 29°C | 14°C | 21.3°C | 22 mm |
| August | 27°C | 12°C | 19.9°C | 23 mm |
| September | 21°C | 7°C | 14.2°C | 25 mm |
| October | 13°C | 1°C | 6.6°C | 35 mm |
| November | 5°C | −5°C | −0.1°C | 18 mm |
| December | −1°C | −10°C | −5.2°C | 10 mm |
NOAA publishes no 1991-2020 snowfall normal for this station. The nearest record that keeps one, Leo (6 mi SW) (4 miles away), gets 50 inches of snow in a normal year; elevation and distance can change that.
Source: NOAA NCEI 1991-2020 monthly normals, station USC00488074; 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 Seminoe Reservoir USBR?
Normal highs sit between 65°F and 85°F in June, July, August and September.
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 USC00488074.
When is the last frost at Seminoe Reservoir USBR?
In Seminoe Reservoir USBR, the last spring frost (32°F) comes after May 12 in half of years and after May 25 in one year in ten; the first autumn frost comes before October 4 in half of years and before September 23 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 121 year in 10 after May 25; 9 in 10 after May 1
- First autumn frost, half of years before
- October 41 year in 10 before September 23; 9 in 10 before October 17
NOAA puts the median frost-free season at 143 days, and the season without a hard freeze (28°F) at 161 days.
A hard freeze (28°F) comes after May 2 in half of springs and before October 12 in half of autumns.
The USDA's 2023 Plant Hardiness Zone Map puts Seminoe Reservoir USBR in zone 5a in ZIP code 82334, 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 USC00488074; 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 Seminoe Reservoir USBR?
In a normal year in Seminoe Reservoir USBR, 8 days a year reach 90°F and 173 nights fall to 32°F or colder.
- Days at 90°F or more
- 8a normal year
- Days at 100°F or more
- fewer than 1a normal year
- Nights at 32°F or colder
- 173a normal year
- Days that stay below freezing
- 68high of 32°F or less
Source: NOAA NCEI 1991-2020 annual normals, station USC00488074.
How sunny is it at Seminoe Reservoir USBR?
Over a year 78% of the sunlight that would reach the ground under clear skies gets through the clouds at Seminoe Reservoir USBR, 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 Seminoe Reservoir USBR record?
A normal year at Seminoe Reservoir USBR brings 8,032 heating degree days, 49% more than the median U.S. place (5,373), and 362 cooling degree days, 60% 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 1,983 growing degree days a year above 50°F.
| Month | Heating | Cooling |
|---|---|---|
| January | 1,322 | 0 |
| February | 1,135 | 0 |
| March | 992 | 0 |
| April | 729 | 0 |
| May | 456 | 2 |
| June | 141 | 40 |
| July | 12 | 176 |
| August | 39 | 124 |
| September | 241 | 19 |
| October | 656 | 0 |
| November | 995 | 0 |
| December | 1,314 | 0 |
| Year (annual) | 8,032 | 362 |
Source: NOAA NCEI 1991-2020 monthly normals, station USC00488074. 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 Seminoe Reservoir USBR been warmer than normal?
2022 averaged 43.4°F, 0.5°F below the 1991-2020 normal of 43.9°F. 1 of the 2 complete years since 2021 ran warmer than the normal.
| Year | Mean | Against normal | Precip. |
|---|---|---|---|
| 2021 | 44.9°F | +1.0°F | 13.94 |
| 2022 | 43.4°F | −0.5°F | 11.15 |
Source: observed years: ACIS, station USC00488074. A year counts only with all twelve months complete.
How does Seminoe Reservoir USBR's climate compare?
Seminoe Reservoir USBR is warmer than 32 of the 71 places with their own NOAA record in Wyoming, and wetter than 38. Across the 7,247 U.S. stations with normals, its annual mean of 43.9°F is warmer than 15%.
In the Köppen classification computed from these normals, Seminoe Reservoir USBR is Dfb: continental, no dry season, warm 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 Seminoe Reservoir USBR's climate
What is the coldest month at Seminoe Reservoir USBR?
January, with a normal high of 31°F and a normal low of 14°F. The warmest is July (84°F by day, 57°F at night).
Does it snow at Seminoe Reservoir USBR?
Yes. NOAA publishes no 1991-2020 snowfall normal for the station; the nearest record that keeps one, Leo (6 mi SW) (4 miles away), records 50 inches of snow in a normal year.
What is the rainiest month at Seminoe Reservoir USBR?
May, with 2.14 in of precipitation in a normal year; the driest is December with 0.39 in.
What plant hardiness zone is Seminoe Reservoir USBR in?
The USDA's 2023 map puts Seminoe Reservoir USBR in zone 5a in ZIP code 82334, the nearest ZIP area.
How late can frost come at Seminoe Reservoir USBR?
In half of years the last 32°F night comes after May 12; in one year in ten it comes after May 25. Waiting until May 25 leaves about a one-in-ten chance of a later frost.
Nearby and next
- Wyoming climateThe statewide normals and every place in the state
- Leo (6 mi SW), WY4 miles from this station, 45.9°F a year
- Pathfinder Dam, WY22 miles from this station, 46.3°F a year
- Rawlins, WY29 miles from this station, 43.1°F a year
- Muddy Gap, WY30 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