Nephi, Utah climate: Normal weather by month, frost dates and records
Nephi's normal year runs from 20°F December nights to 90°F July afternoons, with 13.7 inches of precipitation and 45 inches of snow a year. (NOAA 1991-2020 normals)
In metric: a yearly mean of 10.3°C, December lows of −7°C, July highs of 32°C, 349 mm of precipitation a year.
- NOAA stationNephi
- Station IDUSC00426135
- Location39.71°N 111.83°W
- Elevation5,146 ft (1,569 m)
- Population7,326
On October 23, the normal high in Nephi is 61°F and the normal low 36°F, and the chance of measurable rain or snow is 23%.
Normals describe a typical year at the station, not a forecast. The National Weather Service forecast for Nephi.
- Jan 37° 20°
- Feb 42° 24°
- Mar 53° 31°
- Apr 60° 36°
- May 70° 44°
- Jun 82° 53°
- Jul 90° 61°
- Aug 87° 60°
- Sep 78° 50°
- Oct 64° 38°
- Nov 49° 28°
- Dec 37° 20°
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 Nephi each month?
July is the warmest month, with normal highs of 90°F; December the coldest, with normal lows of 20°F. The most precipitation falls in April (1.64 in), the least in July (0.55 in).
| Month | High | Low | Mean | Precip. | Snow | Wet days | 90°F days | Freezing nights | Daylight |
|---|---|---|---|---|---|---|---|---|---|
| January | 37°F | 20°F | 28.4°F | 1.30 | 10.9 | 8 | <1 | 29 | 9 h 40 min |
| February | 42°F | 24°F | 33.2°F | 1.24 | 8.1 | 9 | <1 | 25 | 10 h 40 min |
| March | 53°F | 31°F | 41.9°F | 1.38 | 4.5 | 9 | <1 | 21 | 11 h 50 min |
| April | 60°F | 36°F | 47.6°F | 1.64 | 2.6 | 10 | <1 | 12 | 13 h 10 min |
| May | 70°F | 44°F | 57.0°F | 1.52 | 0.1 | 9 | 1 | 2 | 14 h 20 min |
| June | 82°F | 53°F | 67.2°F | 0.77 | 0.0 | 5 | 7 | <1 | 15 h |
| July | 90°F | 61°F | 75.4°F | 0.55 | 0.0 | 5 | 21 | <1 | 14 h 40 min |
| August | 87°F | 60°F | 73.4°F | 0.73 | 0.0 | 6 | 16 | <1 | 13 h 50 min |
| September | 78°F | 50°F | 64.1°F | 0.95 | 0.0 | 6 | 2 | 1 | 12 h 30 min |
| October | 64°F | 38°F | 50.9°F | 1.33 | 0.7 | 7 | <1 | 9 | 11 h 10 min |
| November | 49°F | 28°F | 38.7°F | 1.09 | 6.0 | 7 | <1 | 22 | 10 h |
| December | 37°F | 20°F | 28.3°F | 1.24 | 12.5 | 8 | <1 | 29 | 9 h 20 min |
| Year (annual) | 62°F | 39°F | 50.5°F | 13.74 | 45.4 | 90 | 48 | 148 |
The same normals in °C and millimetres
| Month | High | Low | Mean | Precip. | Snow |
|---|---|---|---|---|---|
| January | 3°C | −7°C | −2.0°C | 33 mm | 28 cm |
| February | 6°C | −4°C | 0.7°C | 31 mm | 21 cm |
| March | 12°C | −1°C | 5.5°C | 35 mm | 11 cm |
| April | 15°C | 2°C | 8.7°C | 42 mm | 7 cm |
| May | 21°C | 7°C | 13.9°C | 39 mm | 0 cm |
| June | 28°C | 12°C | 19.6°C | 20 mm | 0 cm |
| July | 32°C | 16°C | 24.1°C | 14 mm | 0 cm |
| August | 31°C | 15°C | 23.0°C | 19 mm | 0 cm |
| September | 26°C | 10°C | 17.8°C | 24 mm | 0 cm |
| October | 18°C | 3°C | 10.5°C | 34 mm | 2 cm |
| November | 10°C | −2°C | 3.7°C | 28 mm | 15 cm |
| December | 3°C | −7°C | −2.1°C | 31 mm | 32 cm |
Source: NOAA NCEI 1991-2020 monthly normals, station USC00426135; 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 Nephi?
Normal highs sit between 65°F and 85°F in May, June and September. Of those, June 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 USC00426135.
When is the last frost in Nephi?
In Nephi, the last spring frost (32°F) comes after May 6 in half of years and after May 24 in one year in ten; the first autumn frost comes before October 10 in half of years and before September 28 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 61 year in 10 after May 24; 9 in 10 after April 21
- First autumn frost, half of years before
- October 101 year in 10 before September 28; 9 in 10 before October 24
NOAA puts the median frost-free season at 156 days, and the season without a hard freeze (28°F) at 182 days.
A hard freeze (28°F) comes after April 21 in half of springs and before October 23 in half of autumns.
The USDA's 2023 Plant Hardiness Zone Map puts Nephi in zone 6a in ZIP code 84648, the nearest ZIP area. By the map's own method, the average of each year's coldest night over 1991-2020, Nephi's NOAA station is in zone 6b: the coldest night of a typical year reaches −3°F (29 complete years); the map interpolates between stations and terrain, so the station and the ZIP area can differ by half a zone.
Frost dates for every NOAA station in Utah · Frost dates by ZIP code
Source: NOAA NCEI 1991-2020 annual normals (frost probabilities), station USC00426135; 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 Nephi?
In a normal year in Nephi, 48 days a year reach 90°F (1 of them 100°F or more), 148 nights fall to 32°F or colder and 90 days bring measurable precipitation.
- Days at 90°F or more
- 48a normal year
- Days at 100°F or more
- 1a normal year
- Nights at 32°F or colder
- 148a normal year
- Days that stay below freezing
- 21high of 32°F or less
- Days with 0.01 inch of precipitation
- 90a normal year
- Days with 1 inch of snow or more
- 16a normal year
The highest temperature in this station's record (since 1913) is 110°F, on June 26, 1970; the lowest is −21°F, on December 23, 1990.
The wettest calendar year on that record is 1983, with 26.52 in; the snowiest season is 1983–84, with 100.0 inches.
Source: NOAA NCEI 1991-2020 annual normals, station USC00426135; records: ACIS (NOAA Regional Climate Centers), station USC00426135. Records use complete months only; a month missing more than three days is left out.
How sunny is Nephi?
Over a year 80% of the sunlight that would reach the ground under clear skies gets through the clouds in the area around Nephi, 5.0 kWh per square metre a day. June is the sunniest month (87%) and December the cloudiest (72%).
| Month | Share of clear-sky sunshine | Sunshine, kWh/m² a day |
|---|---|---|
| January | 76% | 2.5 |
| February | 75% | 3.4 |
| March | 76% | 4.7 |
| April | 74% | 5.7 |
| May | 78% | 6.8 |
| June | 87% | 7.9 |
| July | 84% | 7.2 |
| August | 84% | 6.5 |
| September | 86% | 5.5 |
| October | 82% | 4.0 |
| November | 77% | 2.7 |
| December | 72% | 2.1 |
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 Nephi need?
A normal year in Nephi brings 6,077 heating degree days, 13% more than the median U.S. place (5,373), and 821 cooling degree days, 10% 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 2,928 growing degree days a year above 50°F.
| Month | Heating | Cooling |
|---|---|---|
| January | 1,136 | 0 |
| February | 889 | 0 |
| March | 715 | 0 |
| April | 523 | 1 |
| May | 271 | 21 |
| June | 66 | 132 |
| July | 2 | 325 |
| August | 5 | 266 |
| September | 103 | 75 |
| October | 439 | 2 |
| November | 791 | 0 |
| December | 1,137 | 0 |
| Year (annual) | 6,077 | 821 |
Source: NOAA NCEI 1991-2020 monthly normals, station USC00426135. 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 Nephi been warmer than normal lately?
2025 averaged 53.6°F, 3.1°F above the 1991-2020 normal of 50.5°F. 3 of the 3 complete years since 2022 ran warmer than the normal.
| Year | Mean | Against normal | Precip. | Snow |
|---|---|---|---|---|
| 2022 | 51.0°F | +0.5°F | 12.20 | – |
| 2024 | 52.8°F | +2.3°F | 17.01 | 34.9 |
| 2025 | 53.6°F | +3.1°F | 11.10 | 19.0 |
Over 63 complete years from 1943 to 2025, the station's annual mean temperature rose at a fitted 3.1°F per century (+0.17°C per decade). A fitted rate summarizes the whole record; single years swing well above and below it.
Source: observed years: ACIS, station USC00426135; trend: NOAA GHCN-Monthly v4. A year counts only with all twelve months complete.
How does Nephi's climate compare?
Nephi is warmer than 55 of the other 96 places with their own NOAA record in Utah, and wetter than 50. 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, Nephi 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 Nephi share this climate record?
Mona 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.
- Mona, UT1,950 people · 7 mi N
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 Nephi's climate
What is the coldest month in Nephi?
December, with a normal high of 37°F and a normal low of 20°F. The warmest is July (90°F by day, 61°F at night).
Does it snow in Nephi?
Yes: 45 inches in a normal year, falling on 24 days with 0.1 inch or more, the most in December (12.5 inches).
What is the rainiest month in Nephi?
April, with 1.64 in of precipitation in a normal year; the driest is July with 0.55 in.
What plant hardiness zone is Nephi in?
The USDA's 2023 map puts Nephi in zone 6a in ZIP code 84648, the nearest ZIP area. By the same method at Nephi's NOAA station, the coldest night of a typical year reaches −3°F (29 years, 1991-2020): zone 6b.
How late can frost come in Nephi?
In half of years the last 32°F night comes after May 6; in one year in ten it comes after May 24. Waiting until May 24 leaves about a one-in-ten chance of a later frost.
Nearby and next
- Utah climateThe statewide normals and every place in the state
- Levan, UT11 miles from this station, 50.5°F a year
- Santaquin, UT17 miles from this station, 50.7°F a year
- Moroni, UT18 miles from this station, 47.5°F a year
- Little Sahara Rec Area, UT25 miles from this station, 50.1°F a year
- Compare two placesMonth by month, side by side
Download these normals (CSV) · JSON · How these figures are made