Trenton, Utah climate: Normal weather by month, frost dates and records
Trenton's normal year runs from 12°F January nights to 89°F July afternoons, with 16.9 inches of precipitation and 49 inches of snow a year. (NOAA 1991-2020 normals)
In metric: a yearly mean of 7.7°C, January lows of −11°C, July highs of 32°C, 429 mm of precipitation a year.
- NOAA stationTrenton
- Station IDUSC00428828
- Location41.92°N 111.91°W
- Elevation4,455 ft (1,358 m)
- From the center1 miles
- Population540
On October 23, the normal high in Trenton is 59°F and the normal low 28°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 Trenton.
- Jan 32° 12°
- Feb 37° 17°
- Mar 50° 26°
- Apr 59° 32°
- May 69° 39°
- Jun 79° 45°
- Jul 89° 51°
- Aug 88° 49°
- Sep 77° 40°
- Oct 63° 31°
- Nov 47° 23°
- Dec 34° 14°
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 Trenton each month?
July is the warmest month, with normal highs of 89°F; January the coldest, with normal lows of 12°F. The most precipitation falls in May (2.19 in), the least in July (0.56 in).
| Month | High | Low | Mean | Precip. | Snow | Wet days | 90°F days | Freezing nights | Daylight |
|---|---|---|---|---|---|---|---|---|---|
| January | 32°F | 12°F | 21.9°F | 1.51 | 13.6 | 10 | <1 | 30 | 9 h 30 min |
| February | 37°F | 17°F | 26.8°F | 1.42 | 10.4 | 9 | <1 | 26 | 10 h 30 min |
| March | 50°F | 26°F | 37.7°F | 1.70 | 4.2 | 9 | <1 | 25 | 11 h 50 min |
| April | 59°F | 32°F | 45.4°F | 2.04 | 1.9 | 11 | <1 | 16 | 13 h 20 min |
| May | 69°F | 39°F | 53.9°F | 2.19 | 0.1 | 11 | <1 | 4 | 14 h 30 min |
| June | 79°F | 45°F | 62.3°F | 1.20 | 0.0 | 6 | 4 | <1 | 15 h 10 min |
| July | 89°F | 51°F | 70.1°F | 0.56 | 0.0 | 4 | 16 | <1 | 15 h |
| August | 88°F | 49°F | 68.1°F | 0.83 | 0.0 | 4 | 14 | 1 | 14 h |
| September | 77°F | 40°F | 58.5°F | 1.26 | 0.0 | 5 | 2 | 4 | 12 h 30 min |
| October | 63°F | 31°F | 46.6°F | 1.54 | 0.4 | 7 | <1 | 18 | 11 h 10 min |
| November | 47°F | 23°F | 34.8°F | 1.25 | 4.9 | 7 | <1 | 27 | 9 h 50 min |
| December | 34°F | 14°F | 24.1°F | 1.40 | 13.5 | 10 | <1 | 29 | 9 h 10 min |
| Year (annual) | 60°F | 32°F | 45.9°F | 16.90 | 49.0 | 94 | 35 | 180 |
The same normals in °C and millimetres
| Month | High | Low | Mean | Precip. | Snow |
|---|---|---|---|---|---|
| January | 0°C | −11°C | −5.6°C | 38 mm | 35 cm |
| February | 3°C | −8°C | −2.9°C | 36 mm | 26 cm |
| March | 10°C | −4°C | 3.2°C | 43 mm | 11 cm |
| April | 15°C | 0°C | 7.4°C | 52 mm | 5 cm |
| May | 21°C | 4°C | 12.2°C | 56 mm | 0 cm |
| June | 26°C | 7°C | 16.8°C | 30 mm | 0 cm |
| July | 32°C | 11°C | 21.2°C | 14 mm | 0 cm |
| August | 31°C | 9°C | 20.1°C | 21 mm | 0 cm |
| September | 25°C | 4°C | 14.7°C | 32 mm | 0 cm |
| October | 17°C | −1°C | 8.1°C | 39 mm | 1 cm |
| November | 8°C | −5°C | 1.6°C | 32 mm | 12 cm |
| December | 1°C | −10°C | −4.4°C | 36 mm | 34 cm |
Source: NOAA NCEI 1991-2020 monthly normals, station USC00428828; 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 Trenton?
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 USC00428828.
When is the last frost in Trenton?
In Trenton, the last spring frost (32°F) comes after May 17 in half of years and after June 6 in one year in ten; the first autumn frost comes before September 18 in half of years and before September 1 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 171 year in 10 after June 6; 9 in 10 after May 3
- First autumn frost, half of years before
- September 181 year in 10 before September 1; 9 in 10 before October 4
NOAA puts the median frost-free season at 121 days, and the season without a hard freeze (28°F) at 149 days.
A hard freeze (28°F) comes after May 2 in half of springs and before October 1 in half of autumns.
The USDA's 2023 Plant Hardiness Zone Map puts Trenton in zone 5b in ZIP code 84338. By the map's own method, the average of each year's coldest night over 1991-2020, Trenton's NOAA station is in zone 6a: the coldest night of a typical year reaches −8°F (15 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 USC00428828; 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 Trenton?
In a normal year in Trenton, 35 days a year reach 90°F (1 of them 100°F or more), 180 nights fall to 32°F or colder and 94 days bring measurable precipitation.
- Days at 90°F or more
- 35a normal year
- Days at 100°F or more
- 1a normal year
- Nights at 32°F or colder
- 180a normal year
- Days that stay below freezing
- 37high of 32°F or less
- Days with 0.01 inch of precipitation
- 94a normal year
- Days with 1 inch of snow or more
- 17a normal year
The highest temperature in this station's record (since 1944) is 105°F, on July 13, 2026; the lowest is −36°F, on February 1, 1985.
The wettest calendar year on that record is 1983, with 32.94 in; the snowiest season is 2022–23, with 109.4 inches.
Source: NOAA NCEI 1991-2020 annual normals, station USC00428828; records: ACIS (NOAA Regional Climate Centers), station USC00428828. Records use complete months only; a month missing more than three days is left out.
How sunny is Trenton?
Over a year 81% of the sunlight that would reach the ground under clear skies gets through the clouds in the area around Trenton, 4.8 kWh per square metre a day. July is the sunniest month (90%) and December the cloudiest (67%).
| Month | Share of clear-sky sunshine | Sunshine, kWh/m² a day |
|---|---|---|
| January | 72% | 2.2 |
| February | 72% | 3.1 |
| March | 75% | 4.4 |
| April | 74% | 5.5 |
| May | 77% | 6.5 |
| June | 87% | 7.8 |
| July | 90% | 7.7 |
| August | 89% | 6.7 |
| September | 86% | 5.3 |
| October | 80% | 3.7 |
| November | 72% | 2.4 |
| December | 67% | 1.8 |
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 Trenton need?
A normal year in Trenton brings 7,312 heating degree days, 36% more than the median U.S. place (5,373), and 368 cooling degree days, 59% 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 2,082 growing degree days a year above 50°F.
| Month | Heating | Cooling |
|---|---|---|
| January | 1,336 | 0 |
| February | 1,068 | 0 |
| March | 845 | 0 |
| April | 588 | 0 |
| May | 346 | 4 |
| June | 125 | 44 |
| July | 19 | 177 |
| August | 32 | 128 |
| September | 210 | 15 |
| October | 571 | 0 |
| November | 905 | 0 |
| December | 1,268 | 0 |
| Year (annual) | 7,312 | 368 |
Source: NOAA NCEI 1991-2020 monthly normals, station USC00428828. 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 Trenton been warmer than normal lately?
2025 averaged 49.4°F, 3.5°F above the 1991-2020 normal of 45.9°F. 3 of the 5 complete years since 2021 ran warmer than the normal.
| Year | Mean | Against normal | Precip. | Snow |
|---|---|---|---|---|
| 2021 | 47.6°F | +1.7°F | 12.79 | 39.7 |
| 2022 | 44.9°F | −1.0°F | 12.30 | 33.8 |
| 2023 | 44.8°F | −1.1°F | 21.36 | – |
| 2024 | 48.3°F | +2.4°F | – | 46.4 |
| 2025 | 49.4°F | +3.5°F | 15.82 | 39.6 |
Over 30 complete years from 1977 to 2025, the station's annual mean temperature rose at a fitted 2.7°F per century (+0.15°C per decade). A fitted rate summarizes the whole record; single years swing well above and below it.
Source: observed years: ACIS, station USC00428828; trend: NOAA GHCN-Monthly v4. A year counts only with all twelve months complete.
How does Trenton's climate compare?
Trenton is warmer than 19 of the other 96 places with their own NOAA record in Utah, and wetter than 72. Across the 7,247 U.S. stations with normals, its annual mean of 45.9°F is warmer than 23%.
In the Köppen classification computed from these normals, Trenton is Dsb: continental, dry-summer, warm 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 Trenton share this climate record?
3 places have no NOAA station with 1991-2020 normals of their 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.
- Weston, ID572 people · 9 mi N
- Dayton, ID539 people · 14 mi N
- Amalga, UT517 people · 4 mi S
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 Trenton's climate
What is the coldest month in Trenton?
January, with a normal high of 32°F and a normal low of 12°F. The warmest is July (89°F by day, 51°F at night).
Does it snow in Trenton?
Yes: 49 inches in a normal year, falling on 27 days with 0.1 inch or more, the most in January (13.6 inches).
What is the rainiest month in Trenton?
May, with 2.19 in of precipitation in a normal year; the driest is July with 0.56 in.
What plant hardiness zone is Trenton in?
The USDA's 2023 map puts Trenton in zone 5b in ZIP code 84338. By the same method at Trenton's NOAA station, the coldest night of a typical year reaches −8°F (15 years, 1991-2020): zone 6a.
How late can frost come in Trenton?
In half of years the last 32°F night comes after May 17; in one year in ten it comes after June 6. Waiting until June 6 leaves about a one-in-ten chance of a later frost.
Nearby and next
- Utah climateThe statewide normals and every place in the state
- Richmond, UT6 miles from this station, 47.5°F a year
- Logan, UT9 miles from this station, 47.6°F a year
- Cutler Dam, UT9 miles from this station, 48.8°F a year
- Preston, ID12 miles from this station, 47.0°F a year
- Compare two placesMonth by month, side by side
Download these normals (CSV) · JSON · How these figures are made