Monticello, Utah climate: Normal weather by month, frost dates and records
Monticello's normal year runs from 17°F January nights to 84°F July afternoons, with 15.7 inches of precipitation a year. (NOAA 1991-2020 normals)
In metric: a yearly mean of 8.5°C, January lows of −8°C, July highs of 29°C, 399 mm of precipitation a year.
- NOAA stationMonticello #2
- Station IDUSC00425807
- Location37.87°N 109.35°W
- Elevation7,086 ft (2,160 m)
- Population1,757
Normals describe a typical year at the station, not a forecast. The National Weather Service forecast for Monticello.
- Jan 37° 17°
- Feb 41° 20°
- Mar 50° 26°
- Apr 58° 31°
- May 67° 39°
- Jun 79° 48°
- Jul 84° 55°
- Aug 81° 54°
- Sep 74° 46°
- Oct 62° 36°
- Nov 48° 26°
- Dec 38° 17°
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 Monticello each month?
July is the warmest month, with normal highs of 84°F; January the coldest, with normal lows of 17°F. The most precipitation falls in August (1.93 in), the least in June (0.50 in).
| Month | High | Low | Mean | Precip. | Wet days | 90°F days | Freezing nights | Daylight |
|---|---|---|---|---|---|---|---|---|
| January | 37°F | 17°F | 27.0°F | 1.14 | – | <1 | 31 | 9 h 50 min |
| February | 41°F | 20°F | 30.4°F | 1.48 | – | <1 | 27 | 10 h 50 min |
| March | 50°F | 26°F | 38.2°F | 1.31 | – | <1 | 25 | 11 h 50 min |
| April | 58°F | 31°F | 44.6°F | 1.10 | – | <1 | 16 | 13 h 10 min |
| May | 67°F | 39°F | 53.2°F | 0.89 | – | <1 | 4 | 14 h 10 min |
| June | 79°F | 48°F | 63.7°F | 0.50 | – | 2 | <1 | 14 h 50 min |
| July | 84°F | 55°F | 69.8°F | 1.62 | – | 4 | <1 | 14 h 30 min |
| August | 81°F | 54°F | 67.5°F | 1.93 | – | 2 | <1 | 13 h 40 min |
| September | 74°F | 46°F | 59.9°F | 1.67 | – | 1 | 1 | 12 h 30 min |
| October | 62°F | 36°F | 48.8°F | 1.49 | – | <1 | 10 | 11 h 20 min |
| November | 48°F | 26°F | 37.1°F | 1.17 | – | <1 | 25 | 10 h 10 min |
| December | 38°F | 17°F | 27.7°F | 1.39 | – | <1 | 30 | 9 h 30 min |
| Year (annual) | 60°F | 35°F | 47.3°F | 15.69 | – | 8 | 169 |
The same normals in °C and millimetres
| Month | High | Low | Mean | Precip. |
|---|---|---|---|---|
| January | 3°C | −8°C | −2.8°C | 29 mm |
| February | 5°C | −7°C | −0.9°C | 38 mm |
| March | 10°C | −3°C | 3.4°C | 33 mm |
| April | 14°C | 0°C | 7.0°C | 28 mm |
| May | 19°C | 4°C | 11.8°C | 23 mm |
| June | 26°C | 9°C | 17.6°C | 13 mm |
| July | 29°C | 13°C | 21.0°C | 41 mm |
| August | 27°C | 12°C | 19.7°C | 49 mm |
| September | 23°C | 8°C | 15.5°C | 42 mm |
| October | 16°C | 2°C | 9.3°C | 38 mm |
| November | 9°C | −3°C | 2.8°C | 30 mm |
| December | 3°C | −8°C | −2.4°C | 35 mm |
NOAA publishes no 1991-2020 snowfall normal for this station. Monticello's own co-op station Monticello (2 mi E) does: 64 inches of snow in a normal year (see the other stations below).
Source: NOAA NCEI 1991-2020 monthly normals, station USC00425807; 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 Monticello?
Normal highs sit between 65°F and 85°F in May, June, July, August 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 USC00425807.
When is the last frost in Monticello?
In Monticello, the last spring frost (32°F) comes after May 17 in half of years and after June 4 in one year in ten; the first autumn frost comes before October 7 in half of years and before September 24 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 4; 9 in 10 after May 2
- First autumn frost, half of years before
- October 71 year in 10 before September 24; 9 in 10 before October 20
NOAA puts the median frost-free season at 141 days, and the season without a hard freeze (28°F) at 166 days.
A hard freeze (28°F) comes after May 2 in half of springs and before October 17 in half of autumns.
The USDA's 2023 Plant Hardiness Zone Map puts Monticello in zone 6b in ZIP code 84535, 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 USC00425807; 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 in Monticello?
In a normal year in Monticello, 8 days a year reach 90°F and 169 nights fall to 32°F or colder.
- Days at 90°F or more
- 8a normal year
- Days at 100°F or more
- fewer than 1a normal year
- Nights at 32°F or colder
- 169a normal year
- Days that stay below freezing
- 25high of 32°F or less
Source: NOAA NCEI 1991-2020 annual normals, station USC00425807.
How sunny is Monticello?
Over a year 86% of the sunlight that would reach the ground under clear skies gets through the clouds in the area around Monticello, 5.4 kWh per square metre a day. June is the sunniest month (92%) and December the cloudiest (77%).
| Month | Share of clear-sky sunshine | Sunshine, kWh/m² a day |
|---|---|---|
| January | 79% | 2.8 |
| February | 78% | 3.7 |
| March | 84% | 5.3 |
| April | 85% | 6.7 |
| May | 87% | 7.6 |
| June | 92% | 8.4 |
| July | 88% | 7.5 |
| August | 87% | 6.7 |
| September | 88% | 5.8 |
| October | 87% | 4.5 |
| November | 85% | 3.2 |
| December | 77% | 2.5 |
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 Monticello need?
A normal year in Monticello brings 6,764 heating degree days, 26% more than the median U.S. place (5,373), and 338 cooling degree days, 63% 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 2,139 growing degree days a year above 50°F.
| Month | Heating | Cooling |
|---|---|---|
| January | 1,178 | 0 |
| February | 970 | 0 |
| March | 831 | 0 |
| April | 614 | 0 |
| May | 370 | 4 |
| June | 95 | 56 |
| July | 12 | 160 |
| August | 26 | 102 |
| September | 170 | 17 |
| October | 504 | 0 |
| November | 839 | 0 |
| December | 1,158 | 0 |
| Year (annual) | 6,764 | 338 |
Source: NOAA NCEI 1991-2020 monthly normals, station USC00425807. 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 Monticello been warmer than normal lately?
2025 averaged 49.7°F, 2.4°F above the 1991-2020 normal of 47.3°F. 4 of the 5 complete years since 2021 ran warmer than the normal.
| Year | Mean | Against normal | Precip. |
|---|---|---|---|
| 2021 | 48.3°F | +1.0°F | 16.59 |
| 2022 | 47.5°F | +0.2°F | 13.66 |
| 2023 | 46.3°F | −1.0°F | 17.20 |
| 2024 | 49.1°F | +1.9°F | 17.23 |
| 2025 | 49.7°F | +2.4°F | 13.09 |
Source: observed years: ACIS, station USC00425807. A year counts only with all twelve months complete.
How does Monticello's climate compare?
Monticello is warmer than 32 of the other 96 places with their own NOAA record in Utah, and wetter than 65. Across the 7,247 U.S. stations with normals, its annual mean of 47.3°F is warmer than 29%.
In the Köppen classification computed from these normals, Monticello is Dfb: continental, no dry season, 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.
What do Monticello's other NOAA stations record?
One more NOAA station keeps 1991-2020 normals in or near Monticello. This page uses Monticello #2; the other differs by site and elevation:
| Station | From this station | Elevation | Year | Jan low | Jul high | Precip. | Snow | Last frost |
|---|---|---|---|---|---|---|---|---|
| Monticello (2 mi E) USC00425805 | 2 mi E | 6,820 ft | 46.9°F | 15°F | 85°F | 15.1 | 64 | May 19 |
Source: NOAA NCEI 1991-2020 normals for each station. Last frost: the median last spring date of 32°F.
Questions about Monticello's climate
What is the coldest month in Monticello?
January, with a normal high of 37°F and a normal low of 17°F. The warmest is July (84°F by day, 55°F at night).
Does it snow in Monticello?
Yes. NOAA publishes no 1991-2020 snowfall normal for Monticello's NOAA station; Monticello's own co-op station Monticello (2 mi E) records 64 inches of snow in a normal year.
What is the rainiest month in Monticello?
August, with 1.93 in of precipitation in a normal year; the driest is June with 0.50 in.
What plant hardiness zone is Monticello in?
The USDA's 2023 map puts Monticello in zone 6b in ZIP code 84535, the nearest ZIP area.
How late can frost come in Monticello?
In half of years the last 32°F night comes after May 17; in one year in ten it comes after June 4. Waiting until June 4 leaves about a one-in-ten chance of a later frost.
Nearby and next
- Utah climateThe statewide normals and every place in the state
- Cedar Point, UT18 miles from this station, 48.1°F a year
- Northdale, CO19 miles from this station, 45.5°F a year
- Blanding, UT19 miles from this station, 52.4°F a year
- Dove Creek, CO25 miles from this station, 48.7°F a year
- Compare two placesMonth by month, side by side
Download these normals (CSV) · JSON · How these figures are made