Sundance, Wyoming climate: Normal weather by month, frost dates and records
Sundance's normal year runs from 15°F February nights to 75°F July afternoons, with 29.2 inches of precipitation a year. (NOAA 1991-2020 normals)
In metric: a yearly mean of 5.1°C, February lows of −10°C, July highs of 24°C, 742 mm of precipitation a year.
- NOAA stationSundance (8 mi NNW)
- Station IDUSW00094088
- Location44.52°N 104.44°W
- Elevation5,792 ft (1,765 m)
- Population1,123
On October 23, the normal high in Sundance is 47°F and the normal low 30°F, and the chance of measurable rain or snow is 34%.
Normals describe a typical year at the station, not a forecast. The National Weather Service forecast for Sundance.
- Jan 32° 15°
- Feb 30° 15°
- Mar 39° 23°
- Apr 46° 28°
- May 55° 38°
- Jun 65° 47°
- Jul 75° 53°
- Aug 74° 52°
- Sep 65° 44°
- Oct 50° 33°
- Nov 39° 23°
- Dec 30° 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 in Sundance each month?
July is the warmest month, with normal highs of 75°F; February the coldest, with normal lows of 15°F. The most precipitation falls in May (3.86 in), the least in January (1.57 in).
| Month | High | Low | Mean | Precip. | Wet days | 90°F days | Freezing nights | Daylight |
|---|---|---|---|---|---|---|---|---|
| January | 32°F | 15°F | 23.3°F | 1.57 | 14 | <1 | 30 | 9 h 10 min |
| February | 30°F | 15°F | 22.4°F | 2.03 | 15 | <1 | 27 | 10 h 30 min |
| March | 39°F | 23°F | 30.7°F | 2.61 | 13 | <1 | 25 | 11 h 50 min |
| April | 46°F | 28°F | 37.1°F | 3.56 | 16 | <1 | 21 | 13 h 30 min |
| May | 55°F | 38°F | 46.5°F | 3.86 | 17 | <1 | 10 | 14 h 50 min |
| June | 65°F | 47°F | 56.0°F | 2.93 | 13 | <1 | <1 | 15 h 30 min |
| July | 75°F | 53°F | 64.0°F | 2.44 | 11 | <1 | <1 | 15 h 10 min |
| August | 74°F | 52°F | 63.1°F | 1.92 | 8 | <1 | <1 | 14 h 10 min |
| September | 65°F | 44°F | 54.8°F | 1.71 | 8 | <1 | 2 | 12 h 40 min |
| October | 50°F | 33°F | 41.2°F | 3.06 | 11 | <1 | 15 | 11 h |
| November | 39°F | 23°F | 31.0°F | 1.79 | 10 | <1 | 24 | 9 h 40 min |
| December | 30°F | 16°F | 23.1°F | 1.73 | 13 | <1 | 29 | 8 h 50 min |
| Year (annual) | 50°F | 32°F | 41.1°F | 29.21 | 149 | 1 | 182 |
The same normals in °C and millimetres
| Month | High | Low | Mean | Precip. |
|---|---|---|---|---|
| January | 0°C | −9°C | −4.8°C | 40 mm |
| February | −1°C | −10°C | −5.3°C | 52 mm |
| March | 4°C | −5°C | −0.7°C | 66 mm |
| April | 8°C | −2°C | 2.8°C | 90 mm |
| May | 13°C | 3°C | 8.1°C | 98 mm |
| June | 19°C | 8°C | 13.3°C | 74 mm |
| July | 24°C | 12°C | 17.8°C | 62 mm |
| August | 23°C | 11°C | 17.3°C | 49 mm |
| September | 19°C | 7°C | 12.7°C | 43 mm |
| October | 10°C | 0°C | 5.1°C | 78 mm |
| November | 4°C | −5°C | −0.6°C | 45 mm |
| December | −1°C | −9°C | −4.9°C | 44 mm |
NOAA publishes no 1991-2020 snowfall normal for this station. Sundance's own co-op station Sundance station does: 81 inches of snow in a normal year (see the other stations below).
Source: NOAA NCEI 1991-2020 monthly normals, station USW00094088; 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 Sundance?
Normal highs sit between 65°F and 85°F in June, July, August and September. Of those, August has the fewest days with rain (8).
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 USW00094088.
When is the last frost in Sundance?
In Sundance, the last spring frost (32°F) comes after May 23 in half of years and after June 3 in one year in ten; the first autumn frost comes before September 24 in half of years and before September 7 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 231 year in 10 after June 3; 9 in 10 after May 10
- First autumn frost, half of years before
- September 241 year in 10 before September 7; 9 in 10 before October 8
NOAA puts the median frost-free season at 121 days, and the season without a hard freeze (28°F) at 143 days.
A hard freeze (28°F) comes after May 12 in half of springs and before October 4 in half of autumns.
The USDA's 2023 Plant Hardiness Zone Map puts Sundance in zone 4b in ZIP code 82729, 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 USW00094088; 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 in Sundance?
In a normal year in Sundance, 1 day a year reaches 90°F, 182 nights fall to 32°F or colder and 149 days bring measurable precipitation.
- Days at 90°F or more
- 1a normal year
- Days at 100°F or more
- fewer than 1a normal year
- Nights at 32°F or colder
- 182a normal year
- Days that stay below freezing
- 77high of 32°F or less
- Days with 0.01 inch of precipitation
- 149a normal year
Source: NOAA NCEI 1991-2020 annual normals, station USW00094088.
How sunny is Sundance?
Over a year 78% of the sunlight that would reach the ground under clear skies gets through the clouds in the area around Sundance, 4.3 kWh per square metre a day. July is the sunniest month (87%) and April the cloudiest (71%).
| Month | Share of clear-sky sunshine | Sunshine, kWh/m² a day |
|---|---|---|
| January | 74% | 1.9 |
| February | 75% | 2.9 |
| March | 74% | 4.0 |
| April | 71% | 5.0 |
| May | 72% | 6.0 |
| June | 81% | 7.0 |
| July | 87% | 7.2 |
| August | 87% | 6.2 |
| September | 82% | 4.7 |
| October | 74% | 3.1 |
| November | 74% | 2.1 |
| December | 71% | 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 much heating and cooling does Sundance need?
A normal year in Sundance brings 8,839 heating degree days, 65% more than the median U.S. place (5,373), and 157 cooling degree days, 83% fewer than the median (908). Nine months need 300 or more heating degree days, a monthly mean of about 55°F or colder. For gardens and crops, NOAA counts 1,407 growing degree days a year above 50°F.
| Month | Heating | Cooling |
|---|---|---|
| January | 1,293 | 0 |
| February | 1,193 | 0 |
| March | 1,062 | 0 |
| April | 838 | 0 |
| May | 576 | 2 |
| June | 281 | 11 |
| July | 91 | 60 |
| August | 118 | 61 |
| September | 327 | 22 |
| October | 741 | 1 |
| November | 1,020 | 0 |
| December | 1,300 | 0 |
| Year (annual) | 8,839 | 157 |
Source: NOAA NCEI 1991-2020 monthly normals, station USW00094088. 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 Sundance been warmer than normal lately?
2025 averaged 42.6°F, 1.5°F above the 1991-2020 normal of 41.1°F. 4 of the 5 complete years since 2021 ran warmer than the normal.
| Year | Mean | Against normal | Precip. |
|---|---|---|---|
| 2021 | 42.8°F | +1.7°F | 20.69 |
| 2022 | 40.5°F | −0.6°F | 28.11 |
| 2023 | 41.9°F | +0.8°F | 38.05 |
| 2024 | 44.0°F | +2.9°F | – |
| 2025 | 42.6°F | +1.5°F | 33.59 |
Source: observed years: ACIS, station USW00094088. A year counts only with all twelve months complete.
How does Sundance's climate compare?
Sundance is warmer than 18 of the other 70 places with their own NOAA record in Wyoming, and wetter than 63. Across the 7,247 U.S. stations with normals, its annual mean of 41.1°F is warmer than 8%.
In the Köppen classification computed from these normals, Sundance 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.
What do Sundance's other NOAA stations record?
One more NOAA station keeps 1991-2020 normals in or near Sundance. This page uses Sundance (8 mi NNW); the other differs by site and elevation:
| Station | From this station | Elevation | Year | Jan low | Jul high | Precip. | Snow | Last frost |
|---|---|---|---|---|---|---|---|---|
| Sundance station USC00488705 | 8 mi SE | 4,695 ft | 43.8°F | 13°F | 82°F | 20.4 | 81 | May 21 |
Source: NOAA NCEI 1991-2020 normals for each station. Last frost: the median last spring date of 32°F.
Questions about Sundance's climate
What is the coldest month in Sundance?
February, with a normal high of 30°F and a normal low of 15°F. The warmest is July (75°F by day, 53°F at night).
Does it snow in Sundance?
Yes. NOAA publishes no 1991-2020 snowfall normal for Sundance's NOAA station; Sundance's own co-op station Sundance station records 81 inches of snow in a normal year.
What is the rainiest month in Sundance?
May, with 3.86 in of precipitation in a normal year; the driest is January with 1.57 in.
What plant hardiness zone is Sundance in?
The USDA's 2023 map puts Sundance in zone 4b in ZIP code 82729, the nearest ZIP area.
How late can frost come in Sundance?
In half of years the last 32°F night comes after May 23; in one year in ten it comes after June 3. Waiting until June 3 leaves about a one-in-ten chance of a later frost.
Nearby and next
- Wyoming climateThe statewide normals and every place in the state
- Hulett, WY14 miles from this station, 45.0°F a year
- Devils Tower #2, WY14 miles from this station, 44.4°F a year
- Bear Ridge, SD20 miles from this station, 46.7°F a year
- Spearfish, SD28 miles from this station, 46.5°F a year
- Compare two placesMonth by month, side by side
Download these normals (CSV) · JSON · How these figures are made