Ephraim, Utah climate: Normal weather by month, frost dates and records
Ephraim's normal year runs from 11°F January nights to 91°F July afternoons, with 11.7 inches of precipitation and 20 inches of snow a year. (NOAA 1991-2020 normals)
In metric: a yearly mean of 8.3°C, January lows of −12°C, July highs of 33°C, 297 mm of precipitation a year.
- NOAA stationEphraim
- Station IDUSC00422578
- Location39.36°N 111.60°W
- Elevation5,498 ft (1,676 m)
- From the centerunder 1 mile
- Population6,220
On October 23, the normal high in Ephraim is 62°F and the normal low 28°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 Ephraim.
- Jan 36° 11°
- Feb 42° 17°
- Mar 54° 25°
- Apr 61° 30°
- May 71° 37°
- Jun 83° 44°
- Jul 91° 52°
- Aug 89° 50°
- Sep 79° 41°
- Oct 65° 30°
- Nov 51° 20°
- Dec 37° 11°
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 Ephraim each month?
July is the warmest month, with normal highs of 91°F; January the coldest, with normal lows of 11°F. The most precipitation falls in May (1.30 in), the least in July (0.62 in).
| Month | High | Low | Mean | Precip. | Snow | Wet days | 90°F days | Freezing nights | Daylight |
|---|---|---|---|---|---|---|---|---|---|
| January | 36°F | 11°F | 23.5°F | 0.90 | 4.1 | 6 | <1 | 30 | 9 h 40 min |
| February | 42°F | 17°F | 29.8°F | 0.96 | 2.8 | 7 | <1 | 27 | 10 h 40 min |
| March | 54°F | 25°F | 39.3°F | 1.02 | 2.6 | 7 | <1 | 26 | 11 h 50 min |
| April | 61°F | 30°F | 45.1°F | 1.11 | 0.7 | 7 | <1 | 18 | 13 h 10 min |
| May | 71°F | 37°F | 54.3°F | 1.30 | 0.1 | 6 | 1 | 6 | 14 h 20 min |
| June | 83°F | 44°F | 63.5°F | 0.78 | 0.0 | 4 | 8 | 1 | 15 h |
| July | 91°F | 52°F | 71.4°F | 0.62 | 0.0 | 4 | 21 | <1 | 14 h 40 min |
| August | 89°F | 50°F | 69.2°F | 0.81 | 0.0 | 6 | 16 | <1 | 13 h 50 min |
| September | 79°F | 41°F | 60.1°F | 1.08 | 0.0 | 5 | 2 | 4 | 12 h 30 min |
| October | 65°F | 30°F | 47.7°F | 1.08 | 0.1 | 5 | <1 | 19 | 11 h 10 min |
| November | 51°F | 20°F | 35.4°F | 0.88 | 1.4 | 5 | <1 | 27 | 10 h |
| December | 37°F | 11°F | 24.0°F | 1.15 | 8.0 | 7 | <1 | 30 | 9 h 30 min |
| Year (annual) | 63°F | 31°F | 46.9°F | 11.69 | 19.8 | 69 | 48 | 187 |
The same normals in °C and millimetres
| Month | High | Low | Mean | Precip. | Snow |
|---|---|---|---|---|---|
| January | 2°C | −12°C | −4.7°C | 23 mm | 10 cm |
| February | 6°C | −8°C | −1.2°C | 24 mm | 7 cm |
| March | 12°C | −4°C | 4.1°C | 26 mm | 7 cm |
| April | 16°C | −1°C | 7.3°C | 28 mm | 2 cm |
| May | 22°C | 3°C | 12.4°C | 33 mm | 0 cm |
| June | 28°C | 7°C | 17.5°C | 20 mm | 0 cm |
| July | 33°C | 11°C | 21.9°C | 16 mm | 0 cm |
| August | 32°C | 10°C | 20.7°C | 21 mm | 0 cm |
| September | 26°C | 5°C | 15.6°C | 27 mm | 0 cm |
| October | 19°C | −1°C | 8.7°C | 27 mm | 0 cm |
| November | 10°C | −6°C | 1.9°C | 22 mm | 4 cm |
| December | 3°C | −11°C | −4.4°C | 29 mm | 20 cm |
Source: NOAA NCEI 1991-2020 monthly normals, station USC00422578; 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 Ephraim?
Normal highs sit between 65°F and 85°F in May, June, September and October. Of those, June 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 USC00422578.
When is the last frost in Ephraim?
In Ephraim, the last spring frost (32°F) comes after May 28 in half of years and after June 15 in one year in ten; the first autumn frost comes before September 20 in half of years and before September 5 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 281 year in 10 after June 15; 9 in 10 after May 12
- First autumn frost, half of years before
- September 201 year in 10 before September 5; 9 in 10 before October 1
NOAA puts the median frost-free season at 113 days, and the season without a hard freeze (28°F) at 137 days.
A hard freeze (28°F) comes after May 12 in half of springs and before September 29 in half of autumns.
The USDA's 2023 Plant Hardiness Zone Map puts Ephraim in zone 6a in ZIP code 84627. By the map's own method, the average of each year's coldest night over 1991-2020, Ephraim's NOAA station is in zone 5b: the coldest night of a typical year reaches −13°F (28 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 USC00422578; 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 Ephraim?
In a normal year in Ephraim, 48 days a year reach 90°F (4 of them 100°F or more), 187 nights fall to 32°F or colder and 69 days bring measurable precipitation.
- Days at 90°F or more
- 48a normal year
- Days at 100°F or more
- 4a normal year
- Nights at 32°F or colder
- 187a normal year
- Days that stay below freezing
- 26high of 32°F or less
- Days with 0.01 inch of precipitation
- 69a normal year
- Days with 1 inch of snow or more
- 7a normal year
The highest temperature in this station's record (since 1950) is 108°F, on July 18, 1998; the lowest is −34°F, on December 23, 1990.
The wettest calendar year on that record is 1983, with 19.89 in; the snowiest season is 2009–10, with 43.4 inches.
Source: NOAA NCEI 1991-2020 annual normals, station USC00422578; records: ACIS (NOAA Regional Climate Centers), station USC00422578. Records use complete months only; a month missing more than three days is left out.
How sunny is Ephraim?
Over a year 80% of the sunlight that would reach the ground under clear skies gets through the clouds in the area around Ephraim, 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 Ephraim need?
A normal year in Ephraim brings 6,993 heating degree days, 30% more than the median U.S. place (5,373), and 441 cooling degree days, 51% 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 2,267 growing degree days a year above 50°F.
| Month | Heating | Cooling |
|---|---|---|
| January | 1,286 | 0 |
| February | 986 | 0 |
| March | 795 | 0 |
| April | 596 | 0 |
| May | 339 | 7 |
| June | 104 | 59 |
| July | 7 | 205 |
| August | 17 | 148 |
| September | 169 | 22 |
| October | 536 | 0 |
| November | 887 | 0 |
| December | 1,272 | 0 |
| Year (annual) | 6,993 | 441 |
Source: NOAA NCEI 1991-2020 monthly normals, station USC00422578. 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 Ephraim been warmer than normal lately?
2025 averaged 50.1°F, 3.2°F above the 1991-2020 normal of 46.9°F. 2 of the 3 complete years since 2023 ran warmer than the normal.
| Year | Mean | Against normal | Precip. | Snow |
|---|---|---|---|---|
| 2023 | 46.2°F | −0.7°F | – | – |
| 2024 | 49.5°F | +2.6°F | – | – |
| 2025 | 50.1°F | +3.2°F | 7.62 | – |
Over 48 complete years from 1952 to 2025, the station's annual mean temperature rose at a fitted 3.9°F per century (+0.22°C per decade). A fitted rate summarizes the whole record; single years swing well above and below it.
Source: observed years: ACIS, station USC00422578; trend: NOAA GHCN-Monthly v4. A year counts only with all twelve months complete.
How does Ephraim's climate compare?
Ephraim is warmer than 29 of the other 96 places with their own NOAA record in Utah, and wetter than 37. Across the 7,247 U.S. stations with normals, its annual mean of 46.9°F is warmer than 27%.
In the Köppen classification computed from these normals, Ephraim 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 Ephraim's climate
What is the coldest month in Ephraim?
January, with a normal high of 36°F and a normal low of 11°F. The warmest is July (91°F by day, 52°F at night).
Does it snow in Ephraim?
Yes: 20 inches in a normal year, falling on 10 days with 0.1 inch or more, the most in December (8.0 inches).
What is the rainiest month in Ephraim?
May, with 1.30 in of precipitation in a normal year; the driest is July with 0.62 in.
What plant hardiness zone is Ephraim in?
The USDA's 2023 map puts Ephraim in zone 6a in ZIP code 84627. By the same method at Ephraim's NOAA station, the coldest night of a typical year reaches −13°F (28 years, 1991-2020): zone 5b.
How late can frost come in Ephraim?
In half of years the last 32°F night comes after May 28; in one year in ten it comes after June 15. Waiting until June 15 leaves about a one-in-ten chance of a later frost.
Nearby and next
- Utah climateThe statewide normals and every place in the state
- Manti, UT7 miles from this station, 49.2°F a year
- Moroni, UT12 miles from this station, 47.5°F a year
- Levan, UT20 miles from this station, 50.5°F a year
- Electric Lake, UT27 miles from this station, 34.3°F a year
- Compare two placesMonth by month, side by side
Download these normals (CSV) · JSON · How these figures are made