Sunnyside City, Utah climate: Climate normals at a NOAA weather station
Sunnyside City's normal year runs from 22°F December nights to 89°F July afternoons, with 15.3 inches of precipitation a year. (NOAA 1991-2020 normals)
In metric: a yearly mean of 10.3°C, December lows of −6°C, July highs of 31°C, 389 mm of precipitation a year.
- NOAA stationSunnyside City
- Station IDUSC00428476
- Location39.55°N 110.39°W
- Elevation6,511 ft (1,985 m)
On October 23, the normal high in Sunnyside City is 59°F and the normal low 37°F.
Normals describe a typical year at the station, not a forecast. The National Weather Service forecast for Sunnyside City.
- Jan 39° 22°
- Feb 43° 23°
- Mar 54° 30°
- Apr 61° 36°
- May 71° 43°
- Jun 82° 52°
- Jul 89° 59°
- Aug 86° 58°
- Sep 77° 50°
- Oct 62° 39°
- Nov 49° 30°
- Dec 38° 22°
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 Sunnyside City each month?
July is the warmest month, with normal highs of 89°F; December the coldest, with normal lows of 22°F. The most precipitation falls in September (2.00 in), the least in November (0.69 in).
| Month | High | Low | Mean | Precip. | Wet days | 90°F days | Freezing nights | Daylight |
|---|---|---|---|---|---|---|---|---|
| January | 39°F | 22°F | 30.2°F | 1.09 | – | <1 | 29 | 9 h 40 min |
| February | 43°F | 23°F | 33.1°F | 0.94 | – | <1 | 26 | 10 h 40 min |
| March | 54°F | 30°F | 42.0°F | 1.45 | – | <1 | 16 | 11 h 50 min |
| April | 61°F | 36°F | 48.4°F | 1.29 | – | <1 | 6 | 13 h 10 min |
| May | 71°F | 43°F | 57.0°F | 1.43 | – | <1 | 1 | 14 h 20 min |
| June | 82°F | 52°F | 67.2°F | 0.79 | – | 7 | <1 | 15 h |
| July | 89°F | 59°F | 73.7°F | 1.23 | – | 16 | <1 | 14 h 40 min |
| August | 86°F | 58°F | 71.9°F | 1.55 | – | 12 | <1 | 13 h 50 min |
| September | 77°F | 50°F | 63.5°F | 2.00 | – | 2 | <1 | 12 h 30 min |
| October | 62°F | 39°F | 50.6°F | 1.42 | – | <1 | 5 | 11 h 10 min |
| November | 49°F | 30°F | 39.0°F | 0.69 | – | <1 | 15 | 10 h |
| December | 38°F | 22°F | 30.0°F | 1.43 | – | <1 | 29 | 9 h 20 min |
| Year (annual) | 62°F | 39°F | 50.5°F | 15.31 | – | 36 | 128 |
The same normals in °C and millimetres
| Month | High | Low | Mean | Precip. |
|---|---|---|---|---|
| January | 4°C | −6°C | −1.0°C | 28 mm |
| February | 6°C | −5°C | 0.6°C | 24 mm |
| March | 12°C | −1°C | 5.6°C | 37 mm |
| April | 16°C | 2°C | 9.1°C | 33 mm |
| May | 21°C | 6°C | 13.9°C | 36 mm |
| June | 28°C | 11°C | 19.6°C | 20 mm |
| July | 31°C | 15°C | 23.2°C | 31 mm |
| August | 30°C | 14°C | 22.2°C | 39 mm |
| September | 25°C | 10°C | 17.5°C | 51 mm |
| October | 17°C | 4°C | 10.3°C | 36 mm |
| November | 9°C | −1°C | 3.9°C | 18 mm |
| December | 3°C | −6°C | −1.1°C | 36 mm |
NOAA publishes no 1991-2020 snowfall normal for this station. The nearest record that keeps one, Wellington (16 miles away), gets 22 inches of snow in a normal year; elevation and distance can change that.
Source: NOAA NCEI 1991-2020 monthly normals, station USC00428476; 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 Sunnyside City?
Normal highs sit between 65°F and 85°F in May, June 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 USC00428476.
When is the last frost at Sunnyside City?
In Sunnyside City, the last spring frost (32°F) comes after April 26 in half of years and after May 18 in one year in ten; the first autumn frost comes before October 25 in half of years and before October 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
- April 261 year in 10 after May 18; 9 in 10 after April 8
- First autumn frost, half of years before
- October 251 year in 10 before October 7; 9 in 10 before November 11
NOAA puts the median frost-free season at 181 days, and the season without a hard freeze (28°F) at 212 days.
A hard freeze (28°F) comes after April 7 in half of springs and before November 7 in half of autumns.
The USDA's 2023 Plant Hardiness Zone Map puts Sunnyside City in zone 6b in ZIP code 84539, the nearest ZIP area.
Frost dates for every NOAA station in Utah · Frost dates by ZIP code
Source: NOAA NCEI 1991-2020 annual normals (frost probabilities), station USC00428476; 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 Sunnyside City?
In a normal year in Sunnyside City, 36 days a year reach 90°F and 128 nights fall to 32°F or colder.
- Days at 90°F or more
- 36a normal year
- Days at 100°F or more
- fewer than 1a normal year
- Nights at 32°F or colder
- 128a normal year
- Days that stay below freezing
- 16high of 32°F or less
Source: NOAA NCEI 1991-2020 annual normals, station USC00428476.
How sunny is it at Sunnyside City?
Over a year 82% of the sunlight that would reach the ground under clear skies gets through the clouds at Sunnyside City, 5.1 kWh per square metre a day. June is the sunniest month (87%) and December the cloudiest (74%).
| Month | Share of clear-sky sunshine | Sunshine, kWh/m² a day |
|---|---|---|
| January | 76% | 2.5 |
| February | 75% | 3.4 |
| March | 80% | 4.9 |
| April | 80% | 6.2 |
| May | 82% | 7.1 |
| June | 87% | 7.9 |
| July | 84% | 7.2 |
| August | 84% | 6.5 |
| September | 87% | 5.6 |
| October | 85% | 4.2 |
| November | 82% | 2.9 |
| December | 74% | 2.2 |
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 Sunnyside City record?
A normal year at Sunnyside City brings 5,933 heating degree days, 10% more than the median U.S. place (5,373), and 688 cooling degree days, 24% fewer than the median (908). Seven months need 300 or more heating degree days, a monthly mean of about 55°F or colder. For gardens and crops, NOAA counts 2,773 growing degree days a year above 50°F.
| Month | Heating | Cooling |
|---|---|---|
| January | 1,079 | 0 |
| February | 894 | 0 |
| March | 713 | 0 |
| April | 500 | 0 |
| May | 264 | 16 |
| June | 56 | 120 |
| July | 2 | 269 |
| August | 7 | 221 |
| September | 105 | 58 |
| October | 450 | 3 |
| November | 780 | 0 |
| December | 1,084 | 0 |
| Year (annual) | 5,933 | 688 |
Source: NOAA NCEI 1991-2020 monthly normals, station USC00428476. 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 Sunnyside City been warmer than normal?
2025 averaged 54.9°F, 4.4°F above the 1991-2020 normal of 50.5°F. 5 of the 5 complete years since 2021 ran warmer than the normal.
| Year | Mean | Against normal | Precip. |
|---|---|---|---|
| 2021 | 53.2°F | +2.7°F | 16.91 |
| 2022 | 51.4°F | +0.9°F | 12.80 |
| 2023 | 51.4°F | +0.9°F | 13.28 |
| 2024 | 53.8°F | +3.3°F | 14.64 |
| 2025 | 54.9°F | +4.4°F | 11.55 |
Source: observed years: ACIS, station USC00428476. A year counts only with all twelve months complete.
How does Sunnyside City's climate compare?
Sunnyside City is warmer than 55 of the 97 places with their own NOAA record in Utah, and wetter than 61. Across the 7,247 U.S. stations with normals, its annual mean of 50.5°F is warmer than 43%.
In the Köppen classification computed from these normals, Sunnyside City is Dfa: continental, no dry season, hot 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 Sunnyside City share this climate record?
East Carbon 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.
- East Carbon, UT1,566 people · 2 mi SW
Source: Census Bureau 2024 Gazetteer (place centers) and Vintage 2024 population estimates. Distance and direction from the station to each place's center.
What do Sunnyside City's other NOAA stations record?
One more NOAA station keeps 1991-2020 normals in or near Sunnyside City. This page uses SUNNYSIDE CITY; the other differs by site and elevation:
| Station | From this station | Elevation | Year | Jan low | Jul high | Precip. | Snow | Last frost |
|---|---|---|---|---|---|---|---|---|
| Sunnyside City Center USC00428478 | in town | 6,530 ft | 49.0°F | 19°F | 87°F | 14.0 | – | May 5 |
Source: NOAA NCEI 1991-2020 normals for each station. Last frost: the median last spring date of 32°F.
Questions about Sunnyside City's climate
What is the coldest month at Sunnyside City?
December, with a normal high of 38°F and a normal low of 22°F. The warmest is July (89°F by day, 59°F at night).
Does it snow at Sunnyside City?
Yes. NOAA publishes no 1991-2020 snowfall normal for the station; the nearest record that keeps one, Wellington (16 miles away), records 22 inches of snow in a normal year.
What is the rainiest month at Sunnyside City?
September, with 2.00 in of precipitation in a normal year; the driest is November with 0.69 in.
What plant hardiness zone is Sunnyside City in?
The USDA's 2023 map puts Sunnyside City in zone 6b in ZIP code 84539, the nearest ZIP area.
How late can frost come at Sunnyside City?
In half of years the last 32°F night comes after April 26; in one year in ten it comes after May 18. Waiting until May 18 leaves about a one-in-ten chance of a later frost.
Nearby and next
- Utah climateThe statewide normals and every place in the state
- Wellington, UT16 miles from this station, 47.0°F a year
- Price, UT20 miles from this station, 49.5°F a year
- Castle Dale, UT41 miles from this station, 48.9°F a year
- Duchesne, UT43 miles from this station, 48.1°F a year
- Compare two placesMonth by month, side by side
Download these normals (CSV) · JSON · How these figures are made