Upton, Wyoming climate: Normal weather by month, frost dates and records
Upton's normal year runs from 10°F January nights to 87°F July afternoons, with 16.2 inches of precipitation and 46 inches of snow a year. (NOAA 1991-2020 normals)
In metric: a yearly mean of 7.1°C, January lows of −12°C, July highs of 31°C, 410 mm of precipitation a year.
- NOAA stationUpton
- Station IDUSC00489205
- Location44.09°N 104.61°W
- Elevation4,320 ft (1,317 m)
- Population900
On October 23, the normal high in Upton is 55°F and the normal low 29°F, and the chance of measurable rain or snow is 15%.
Normals describe a typical year at the station, not a forecast. The National Weather Service forecast for Upton.
- Jan 33° 10°
- Feb 35° 12°
- Mar 47° 22°
- Apr 56° 30°
- May 65° 40°
- Jun 77° 49°
- Jul 87° 57°
- Aug 85° 54°
- Sep 75° 44°
- Oct 59° 32°
- Nov 44° 20°
- Dec 33° 10°
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 Upton each month?
July is the warmest month, with normal highs of 87°F; January the coldest, with normal lows of 10°F. The most precipitation falls in May (2.83 in), the least in January (0.45 in).
| Month | High | Low | Mean | Precip. | Snow | Wet days | 90°F days | Freezing nights | Daylight |
|---|---|---|---|---|---|---|---|---|---|
| January | 33°F | 10°F | 21.0°F | 0.45 | 8.2 | 4 | <1 | 31 | 9 h 10 min |
| February | 35°F | 12°F | 23.4°F | 0.46 | 8.1 | 4 | <1 | 28 | 10 h 30 min |
| March | 47°F | 22°F | 34.5°F | 0.82 | 6.2 | 5 | <1 | 27 | 11 h 50 min |
| April | 56°F | 30°F | 42.8°F | 1.77 | 5.3 | 8 | <1 | 17 | 13 h 20 min |
| May | 65°F | 40°F | 52.5°F | 2.83 | 0.7 | 10 | <1 | 6 | 14 h 40 min |
| June | 77°F | 49°F | 63.2°F | 2.57 | 0.1 | 9 | 4 | <1 | 15 h 30 min |
| July | 87°F | 57°F | 71.8°F | 2.13 | 0.0 | 7 | 12 | <1 | 15 h 10 min |
| August | 85°F | 54°F | 69.9°F | 1.42 | 0.0 | 5 | 11 | <1 | 14 h |
| September | 75°F | 44°F | 59.6°F | 1.20 | 0.1 | 4 | 3 | 2 | 12 h 40 min |
| October | 59°F | 32°F | 45.3°F | 1.48 | 3.1 | 5 | <1 | 14 | 11 h 10 min |
| November | 44°F | 20°F | 31.5°F | 0.58 | 6.3 | 3 | <1 | 27 | 9 h 40 min |
| December | 33°F | 10°F | 21.8°F | 0.45 | 8.3 | 4 | <1 | 31 | 8 h 50 min |
| Year (annual) | 58°F | 32°F | 44.8°F | 16.16 | 46.4 | 69 | 31 | 182 |
The same normals in °C and millimetres
| Month | High | Low | Mean | Precip. | Snow |
|---|---|---|---|---|---|
| January | 0°C | −12°C | −6.1°C | 11 mm | 21 cm |
| February | 2°C | −11°C | −4.8°C | 12 mm | 21 cm |
| March | 8°C | −6°C | 1.4°C | 21 mm | 16 cm |
| April | 13°C | −1°C | 6.0°C | 45 mm | 13 cm |
| May | 19°C | 4°C | 11.4°C | 72 mm | 2 cm |
| June | 25°C | 10°C | 17.3°C | 65 mm | 0 cm |
| July | 31°C | 14°C | 22.1°C | 54 mm | 0 cm |
| August | 30°C | 12°C | 21.1°C | 36 mm | 0 cm |
| September | 24°C | 7°C | 15.3°C | 30 mm | 0 cm |
| October | 15°C | 0°C | 7.4°C | 38 mm | 8 cm |
| November | 6°C | −7°C | −0.3°C | 15 mm | 16 cm |
| December | 1°C | −12°C | −5.7°C | 11 mm | 21 cm |
Source: NOAA NCEI 1991-2020 monthly normals, station USC00489205; 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 Upton?
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 USC00489205.
When is the last frost in Upton?
In Upton, the last spring frost (32°F) comes after May 20 in half of years and after June 4 in one year in ten; the first autumn frost comes before September 23 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 201 year in 10 after June 4; 9 in 10 after May 8
- First autumn frost, half of years before
- September 231 year in 10 before September 7; 9 in 10 before October 5
NOAA puts the median frost-free season at 123 days, and the season without a hard freeze (28°F) at 145 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 Upton in zone 4b in ZIP code 82730, the nearest ZIP area. By the map's own method, the average of each year's coldest night over 1991-2020, Upton's NOAA station is in zone 4b: the coldest night of a typical year reaches −22°F (28 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 USC00489205; 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 Upton?
In a normal year in Upton, 31 days a year reach 90°F (2 of them 100°F or more), 182 nights fall to 32°F or colder and 69 days bring measurable precipitation.
- Days at 90°F or more
- 31a normal year
- Days at 100°F or more
- 2a normal year
- Nights at 32°F or colder
- 182a normal year
- Days that stay below freezing
- 48high of 32°F or less
- Days with 0.01 inch of precipitation
- 69a normal year
- Days with 1 inch of snow or more
- 19a normal year
The highest temperature in this station's record (since 1909) is 110°F, on July 9, 1954; the lowest is −45°F, on January 23, 1915.
The wettest calendar year on that record is 1998, with 25.76 in; the snowiest season is 1969–70, with 74.0 inches.
Source: NOAA NCEI 1991-2020 annual normals, station USC00489205; records: ACIS (NOAA Regional Climate Centers), station USC00489205. Records use complete months only; a month missing more than three days is left out.
How sunny is Upton?
Over a year 78% of the sunlight that would reach the ground under clear skies gets through the clouds in the area around Upton, 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 Upton need?
A normal year in Upton brings 7,875 heating degree days, 47% more than the median U.S. place (5,373), and 528 cooling degree days, 42% 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 2,258 growing degree days a year above 50°F.
| Month | Heating | Cooling |
|---|---|---|
| January | 1,364 | 0 |
| February | 1,165 | 0 |
| March | 947 | 0 |
| April | 668 | 0 |
| May | 394 | 5 |
| June | 122 | 68 |
| July | 16 | 227 |
| August | 34 | 184 |
| September | 206 | 43 |
| October | 614 | 1 |
| November | 1,005 | 0 |
| December | 1,341 | 0 |
| Year (annual) | 7,875 | 528 |
Source: NOAA NCEI 1991-2020 monthly normals, station USC00489205. 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 Upton been warmer than normal lately?
2024 averaged 48.6°F, 3.8°F above the 1991-2020 normal of 44.8°F. 3 of the 4 complete years since 2021 ran warmer than the normal.
| Year | Mean | Against normal | Precip. | Snow |
|---|---|---|---|---|
| 2021 | 46.5°F | +1.8°F | 11.80 | 40.0 |
| 2022 | 44.3°F | −0.5°F | 12.34 | 31.5 |
| 2023 | 45.7°F | +0.9°F | 15.89 | 53.0 |
| 2024 | 48.6°F | +3.8°F | 12.07 | 28.0 |
Over 54 complete years from 1955 to 2024, the station's annual mean temperature rose at a fitted 4.4°F per century (+0.24°C per decade). A fitted rate summarizes the whole record; single years swing well above and below it.
Source: observed years: ACIS, station USC00489205; trend: NOAA GHCN-Monthly v4. A year counts only with all twelve months complete.
How does Upton's climate compare?
Upton is warmer than 39 of the other 70 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 44.8°F is warmer than 18%.
In the Köppen classification computed from these normals, Upton 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 Upton share this climate record?
Osage 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.
- Osage, WY91 people · 11 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 Upton's climate
What is the coldest month in Upton?
January, with a normal high of 33°F and a normal low of 10°F. The warmest is July (87°F by day, 57°F at night).
Does it snow in Upton?
Yes: 46 inches in a normal year, falling on 21 days with 0.1 inch or more, the most in December (8.3 inches).
What is the rainiest month in Upton?
May, with 2.83 in of precipitation in a normal year; the driest is January with 0.45 in.
What plant hardiness zone is Upton in?
The USDA's 2023 map puts Upton in zone 4b in ZIP code 82730, the nearest ZIP area. By the same method at Upton's NOAA station, the coldest night of a typical year reaches −22°F (28 years, 1991-2020): zone 4b.
How late can frost come in Upton?
In half of years the last 32°F night comes after May 20; in one year in ten it comes after June 4. Waiting until June 4 leaves about a one-in-ten chance of a later frost.
Nearby and next
- Wyoming climateThe statewide normals and every place in the state
- Moorcroft, WY18 miles from this station, 44.6°F a year
- Dillinger, WY25 miles from this station, 45.0°F a year
- Newcastle, WY27 miles from this station, 47.3°F a year
- Sundance, WY30 miles from this station, 41.1°F a year
- Compare two placesMonth by month, side by side
Download these normals (CSV) · JSON · How these figures are made