Midwest, Wyoming climate: Normal weather by month, frost dates and records
Midwest's normal year runs from 12°F January nights to 88°F July afternoons, with 12.4 inches of precipitation and 46 inches of snow a year. (NOAA 1991-2020 normals)
In metric: a yearly mean of 7.2°C, January lows of −11°C, July highs of 31°C, 315 mm of precipitation a year.
- NOAA stationMidwest
- Station IDUSC00486195
- Location43.41°N 106.28°W
- Elevation4,860 ft (1,481 m)
- From the centerunder 1 mile
- Population291
On October 23, the normal high in Midwest is 57°F and the normal low 28°F, and the chance of measurable rain or snow is 14%.
Normals describe a typical year at the station, not a forecast. The National Weather Service forecast for Midwest.
- Jan 36° 12°
- Feb 38° 13°
- Mar 49° 21°
- Apr 56° 28°
- May 66° 38°
- Jun 79° 46°
- Jul 88° 53°
- Aug 86° 50°
- Sep 76° 41°
- Oct 61° 30°
- Nov 46° 20°
- Dec 35° 12°
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 Midwest each month?
July is the warmest month, with normal highs of 88°F; January the coldest, with normal lows of 12°F. The most precipitation falls in May (2.52 in), the least in January (0.32 in).
| Month | High | Low | Mean | Precip. | Snow | Wet days | 90°F days | Freezing nights | Daylight |
|---|---|---|---|---|---|---|---|---|---|
| January | 36°F | 12°F | 23.6°F | 0.32 | 5.0 | 4 | <1 | 30 | 9 h 20 min |
| February | 38°F | 13°F | 25.4°F | 0.53 | 8.3 | 4 | <1 | 28 | 10 h 30 min |
| March | 49°F | 21°F | 35.2°F | 0.96 | 7.7 | 5 | <1 | 27 | 11 h 50 min |
| April | 56°F | 28°F | 42.1°F | 1.39 | 5.7 | 6 | <1 | 20 | 13 h 20 min |
| May | 66°F | 38°F | 51.9°F | 2.52 | 0.7 | 8 | <1 | 7 | 14 h 40 min |
| June | 79°F | 46°F | 62.2°F | 1.59 | 0.0 | 6 | 5 | <1 | 15 h 20 min |
| July | 88°F | 53°F | 70.3°F | 1.07 | 0.0 | 4 | 16 | <1 | 15 h 10 min |
| August | 86°F | 50°F | 68.3°F | 0.66 | 0.0 | 4 | 13 | <1 | 14 h |
| September | 76°F | 41°F | 58.6°F | 0.88 | 0.3 | 4 | 3 | 2 | 12 h 30 min |
| October | 61°F | 30°F | 45.5°F | 1.29 | 4.1 | 5 | <1 | 17 | 11 h 10 min |
| November | 46°F | 20°F | 33.3°F | 0.57 | 6.6 | 4 | <1 | 26 | 9 h 40 min |
| December | 35°F | 12°F | 23.7°F | 0.61 | 7.5 | 4 | <1 | 30 | 9 h |
| Year (annual) | 60°F | 30°F | 45.0°F | 12.39 | 45.9 | 58 | 37 | 187 |
The same normals in °C and millimetres
| Month | High | Low | Mean | Precip. | Snow |
|---|---|---|---|---|---|
| January | 2°C | −11°C | −4.7°C | 8 mm | 13 cm |
| February | 3°C | −10°C | −3.7°C | 13 mm | 21 cm |
| March | 9°C | −6°C | 1.8°C | 24 mm | 20 cm |
| April | 14°C | −2°C | 5.6°C | 35 mm | 14 cm |
| May | 19°C | 3°C | 11.1°C | 64 mm | 2 cm |
| June | 26°C | 8°C | 16.8°C | 40 mm | 0 cm |
| July | 31°C | 11°C | 21.3°C | 27 mm | 0 cm |
| August | 30°C | 10°C | 20.2°C | 17 mm | 0 cm |
| September | 24°C | 5°C | 14.8°C | 22 mm | 1 cm |
| October | 16°C | −1°C | 7.5°C | 33 mm | 10 cm |
| November | 8°C | −6°C | 0.7°C | 14 mm | 17 cm |
| December | 2°C | −11°C | −4.6°C | 15 mm | 19 cm |
Source: NOAA NCEI 1991-2020 monthly normals, station USC00486195; 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 Midwest?
Normal highs sit between 65°F and 85°F in May, June and September. Of those, September has the fewest days with rain (4).
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 USC00486195.
When is the last frost in Midwest?
In Midwest, the last spring frost (32°F) comes after May 22 in half of years and after June 6 in one year in ten; the first autumn frost comes before September 22 in half of years and before September 8 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 221 year in 10 after June 6; 9 in 10 after May 8
- First autumn frost, half of years before
- September 221 year in 10 before September 8; 9 in 10 before October 5
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 9 in half of springs and before October 2 in half of autumns.
The USDA's 2023 Plant Hardiness Zone Map puts Midwest in zone 5a in ZIP code 82643, the nearest ZIP area. By the map's own method, the average of each year's coldest night over 1991-2020, Midwest's NOAA station is in zone 5a: the coldest night of a typical year reaches −19°F (16 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 USC00486195; 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 in Midwest?
In a normal year in Midwest, 37 days a year reach 90°F (2 of them 100°F or more), 187 nights fall to 32°F or colder and 58 days bring measurable precipitation.
- Days at 90°F or more
- 37a normal year
- Days at 100°F or more
- 2a normal year
- Nights at 32°F or colder
- 187a normal year
- Days that stay below freezing
- 39high of 32°F or less
- Days with 0.01 inch of precipitation
- 58a normal year
- Days with 1 inch of snow or more
- 18a normal year
The highest temperature in this station's record (since 1939) is 106°F, on July 12, 1973; the lowest is −42°F, on December 22, 2022.
The wettest calendar year on that record is 1978, with 18.73 in; the snowiest season is 1978–79, with 96.3 inches.
Source: NOAA NCEI 1991-2020 annual normals, station USC00486195; records: ACIS (NOAA Regional Climate Centers), station USC00486195. Records use complete months only; a month missing more than three days is left out.
How sunny is Midwest?
Over a year 79% of the sunlight that would reach the ground under clear skies gets through the clouds in the area around Midwest, 4.5 kWh per square metre a day. July is the sunniest month (87%) and December the cloudiest (70%).
| Month | Share of clear-sky sunshine | Sunshine, kWh/m² a day |
|---|---|---|
| January | 75% | 2.0 |
| February | 71% | 2.8 |
| March | 73% | 4.1 |
| April | 72% | 5.3 |
| May | 74% | 6.2 |
| June | 84% | 7.4 |
| July | 87% | 7.3 |
| August | 87% | 6.4 |
| September | 84% | 5.0 |
| October | 77% | 3.3 |
| November | 74% | 2.2 |
| 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 much heating and cooling does Midwest need?
A normal year in Midwest brings 7,663 heating degree days, 43% more than the median U.S. place (5,373), and 408 cooling degree days, 55% 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 2,101 growing degree days a year above 50°F.
| Month | Heating | Cooling |
|---|---|---|
| January | 1,283 | 0 |
| February | 1,109 | 0 |
| March | 926 | 0 |
| April | 689 | 0 |
| May | 411 | 5 |
| June | 132 | 48 |
| July | 21 | 186 |
| August | 39 | 141 |
| September | 218 | 25 |
| October | 604 | 1 |
| November | 953 | 0 |
| December | 1,280 | 0 |
| Year (annual) | 7,663 | 408 |
Source: NOAA NCEI 1991-2020 monthly normals, station USC00486195. 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 Midwest been warmer than normal lately?
2022 averaged 43.9°F, 1.1°F below the 1991-2020 normal of 45.0°F.
| Year | Mean | Against normal | Precip. | Snow |
|---|---|---|---|---|
| 2022 | 43.9°F | −1.1°F | 14.56 | 73.0 |
Over 72 complete years from 1923 to 2022, the station's annual mean temperature rose at a fitted 0.0°F per century (+0.00°C per decade). A fitted rate summarizes the whole record; single years swing well above and below it.
Source: observed years: ACIS, station USC00486195; trend: NOAA GHCN-Monthly v4. A year counts only with all twelve months complete.
How does Midwest's climate compare?
Midwest is warmer than 42 of the other 70 places with their own NOAA record in Wyoming, and wetter than 34. Across the 7,247 U.S. stations with normals, its annual mean of 45.0°F is warmer than 19%.
In the Köppen classification computed from these normals, Midwest 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.
Which places near Midwest share this climate record?
Edgerton 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.
- Edgerton, WY155 people · 1 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 Midwest's climate
What is the coldest month in Midwest?
January, with a normal high of 36°F and a normal low of 12°F. The warmest is July (88°F by day, 53°F at night).
Does it snow in Midwest?
Yes: 46 inches in a normal year, falling on 23 days with 0.1 inch or more, the most in February (8.3 inches).
What is the rainiest month in Midwest?
May, with 2.52 in of precipitation in a normal year; the driest is January with 0.32 in.
What plant hardiness zone is Midwest in?
The USDA's 2023 map puts Midwest in zone 5a in ZIP code 82643, the nearest ZIP area. By the same method at Midwest's NOAA station, the coldest night of a typical year reaches −19°F (16 years, 1991-2020): zone 5a.
How late can frost come in Midwest?
In half of years the last 32°F night comes after May 22; in one year in ten it comes after June 6. Waiting until June 6 leaves about a one-in-ten chance of a later frost.
Nearby and next
- Wyoming climateThe statewide normals and every place in the state
- Kaycee, WY27 miles from this station, 45.2°F a year
- Wright (12 mi W), WY35 miles from this station, 44.6°F a year
- Casper, WY37 miles from this station, 45.6°F a year
- Powder River, WY44 miles from this station, 44.6°F a year
- Compare two placesMonth by month, side by side
Download these normals (CSV) · JSON · How these figures are made