Phillips, Wyoming climate: Climate normals at a NOAA weather station
Phillips's normal year runs from 16°F December nights to 88°F July afternoons, with 15.2 inches of precipitation and 53 inches of snow a year. (NOAA 1991-2020 normals)
In metric: a yearly mean of 8.8°C, December lows of −9°C, July highs of 31°C, 387 mm of precipitation a year.
- NOAA stationPhillips
- Station IDUSC00487200
- Location41.63°N 104.49°W
- Elevation4,982 ft (1,519 m)
On October 22, the normal high in Phillips is 61°F and the normal low 30°F, and the chance of measurable rain or snow is 17%.
Normals describe a typical year at the station, not a forecast. The National Weather Service forecast for Phillips.
- Jan 42° 17°
- Feb 44° 17°
- Mar 53° 24°
- Apr 60° 30°
- May 69° 39°
- Jun 80° 48°
- Jul 88° 55°
- Aug 86° 52°
- Sep 77° 43°
- Oct 63° 32°
- Nov 51° 23°
- Dec 42° 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 at Phillips each month?
July is the warmest month, with normal highs of 88°F; December the coldest, with normal lows of 16°F. The most precipitation falls in May (2.82 in), the least in January (0.30 in).
| Month | High | Low | Mean | Precip. | Snow | Wet days | 90°F days | Freezing nights | Daylight |
|---|---|---|---|---|---|---|---|---|---|
| January | 42°F | 17°F | 29.6°F | 0.30 | 6.7 | 4 | <1 | 29 | 9 h 30 min |
| February | 44°F | 17°F | 30.5°F | 0.43 | 9.0 | 4 | <1 | 26 | 10 h 30 min |
| March | 53°F | 24°F | 38.6°F | 0.86 | 7.8 | 4 | <1 | 25 | 11 h 50 min |
| April | 60°F | 30°F | 45.0°F | 1.79 | 6.3 | 7 | <1 | 17 | 13 h 20 min |
| May | 69°F | 39°F | 53.9°F | 2.82 | 2.4 | 10 | 1 | 6 | 14 h 30 min |
| June | 80°F | 48°F | 63.7°F | 2.08 | 0.0 | 8 | 4 | <1 | 15 h 10 min |
| July | 88°F | 55°F | 71.0°F | 1.61 | 0.0 | 6 | 14 | <1 | 15 h |
| August | 86°F | 52°F | 69.0°F | 1.52 | 0.0 | 6 | 10 | <1 | 13 h 50 min |
| September | 77°F | 43°F | 60.3°F | 1.42 | 0.2 | 5 | 3 | 2 | 12 h 30 min |
| October | 63°F | 32°F | 47.4°F | 1.27 | 3.5 | 6 | <1 | 15 | 11 h 10 min |
| November | 51°F | 23°F | 37.0°F | 0.64 | 6.7 | 4 | <1 | 25 | 9 h 50 min |
| December | 42°F | 16°F | 29.0°F | 0.48 | 9.9 | 4 | <1 | 29 | 9 h 10 min |
| Year (annual) | 63°F | 33°F | 47.9°F | 15.22 | 52.5 | 68 | 33 | 175 |
The same normals in °C and millimetres
| Month | High | Low | Mean | Precip. | Snow |
|---|---|---|---|---|---|
| January | 6°C | −8°C | −1.3°C | 8 mm | 17 cm |
| February | 7°C | −8°C | −0.8°C | 11 mm | 23 cm |
| March | 12°C | −5°C | 3.7°C | 22 mm | 20 cm |
| April | 15°C | −1°C | 7.2°C | 45 mm | 16 cm |
| May | 20°C | 4°C | 12.2°C | 72 mm | 6 cm |
| June | 27°C | 9°C | 17.6°C | 53 mm | 0 cm |
| July | 31°C | 13°C | 21.7°C | 41 mm | 0 cm |
| August | 30°C | 11°C | 20.6°C | 39 mm | 0 cm |
| September | 25°C | 6°C | 15.7°C | 36 mm | 1 cm |
| October | 17°C | 0°C | 8.6°C | 32 mm | 9 cm |
| November | 11°C | −5°C | 2.8°C | 16 mm | 17 cm |
| December | 5°C | −9°C | −1.7°C | 12 mm | 25 cm |
Source: NOAA NCEI 1991-2020 monthly normals, station USC00487200; 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 Phillips?
Normal highs sit between 65°F and 85°F in May, June and September. Of those, September has the fewest days with rain (5).
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 USC00487200.
When is the last frost at Phillips?
In Phillips, the last spring frost (32°F) comes after May 21 in half of years and after June 7 in one year in ten; the first autumn frost comes before September 21 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 211 year in 10 after June 7; 9 in 10 after May 8
- First autumn frost, half of years before
- September 211 year in 10 before September 8; 9 in 10 before October 3
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 8 in half of springs and before September 30 in half of autumns.
The USDA's 2023 Plant Hardiness Zone Map puts Phillips in zone 5a in ZIP code 82081, 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 5a: the coldest night of a typical year reaches −17°F (15 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 USC00487200; 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 Phillips?
In a normal year in Phillips, 33 days a year reach 90°F (1 of them 100°F or more), 175 nights fall to 32°F or colder and 68 days bring measurable precipitation.
- Days at 90°F or more
- 33a normal year
- Days at 100°F or more
- 1a normal year
- Nights at 32°F or colder
- 175a normal year
- Days that stay below freezing
- 24high of 32°F or less
- Days with 0.01 inch of precipitation
- 68a normal year
- Days with 1 inch of snow or more
- 18a normal year
The highest temperature in this station's record (since 1948) is 105°F, on July 11, 1954; the lowest is −33°F, on December 22, 1990.
The wettest calendar year on that record is 2015, with 22.42 in; the snowiest season is 1979–80, with 112.5 inches.
Source: NOAA NCEI 1991-2020 annual normals, station USC00487200; records: ACIS (NOAA Regional Climate Centers), station USC00487200. Records use complete months only; a month missing more than three days is left out.
How sunny is it at Phillips?
Over a year 78% of the sunlight that would reach the ground under clear skies gets through the clouds at Phillips, 4.6 kWh per square metre a day. August is the sunniest month (83%) and April the cloudiest (72%).
| Month | Share of clear-sky sunshine | Sunshine, kWh/m² a day |
|---|---|---|
| January | 77% | 2.3 |
| February | 75% | 3.2 |
| March | 76% | 4.5 |
| April | 72% | 5.4 |
| May | 73% | 6.1 |
| June | 81% | 7.1 |
| July | 83% | 6.9 |
| August | 83% | 6.1 |
| September | 83% | 5.0 |
| October | 78% | 3.6 |
| November | 78% | 2.5 |
| December | 75% | 2.0 |
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 Phillips record?
A normal year at Phillips brings 6,660 heating degree days, 24% more than the median U.S. place (5,373), and 464 cooling degree days, 49% 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 2,309 growing degree days a year above 50°F.
| Month | Heating | Cooling |
|---|---|---|
| January | 1,098 | 0 |
| February | 966 | 0 |
| March | 819 | 0 |
| April | 599 | 0 |
| May | 350 | 7 |
| June | 104 | 66 |
| July | 13 | 199 |
| August | 28 | 152 |
| September | 181 | 38 |
| October | 546 | 1 |
| November | 840 | 0 |
| December | 1,117 | 0 |
| Year (annual) | 6,660 | 464 |
Source: NOAA NCEI 1991-2020 monthly normals, station USC00487200. 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 Phillips been warmer than normal?
Over 55 complete years from 1949 to 2015, the station's annual mean temperature rose at a fitted 3.0°F per century (+0.16°C per decade). A fitted rate summarizes the whole record; single years swing well above and below it.
Source: trend: NOAA GHCN-Monthly v4. A year counts only with all twelve months complete.
How does Phillips's climate compare?
Phillips is warmer than 63 of the 71 places with their own NOAA record in Wyoming, and wetter than 46. Across the 7,247 U.S. stations with normals, its annual mean of 47.9°F is warmer than 31%.
In the Köppen classification computed from these normals, Phillips 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.
Questions about Phillips's climate
What is the coldest month at Phillips?
December, with a normal high of 42°F and a normal low of 16°F. The warmest is July (88°F by day, 55°F at night).
Does it snow at Phillips?
Yes: 53 inches in a normal year, falling on 22 days with 0.1 inch or more, the most in December (9.9 inches).
What is the rainiest month at Phillips?
May, with 2.82 in of precipitation in a normal year; the driest is January with 0.30 in.
What plant hardiness zone is Phillips in?
The USDA's 2023 map puts Phillips in zone 5a in ZIP code 82081, the nearest ZIP area. By the same method at the station, the coldest night of a typical year reaches −17°F (15 years, 1991-2020): zone 5a.
How late can frost come at Phillips?
In half of years the last 32°F night comes after May 21; in one year in ten it comes after June 7. Waiting until June 7 leaves about a one-in-ten chance of a later frost.
Nearby and next
- Wyoming climateThe statewide normals and every place in the state
- La Grange, WY17 miles from this station, 50.0°F a year
- Chugwater, WY19 miles from this station, 47.8°F a year
- Yoder, WY21 miles from this station, 49.8°F a year
- Albin, WY25 miles from this station, 48.3°F a year
- Compare two placesMonth by month, side by side
Download these normals (CSV) · JSON · How these figures are made