Grant, Colorado climate: Climate normals at a NOAA weather station
Grant's normal year runs from 9°F December nights to 75°F July afternoons, with 15.4 inches of precipitation and 82 inches of snow a year. (NOAA 1991-2020 normals)
In metric: a yearly mean of 3.7°C, December lows of −13°C, July highs of 24°C, 391 mm of precipitation a year.
- NOAA stationGrant
- Station IDUSC00053530
- Location39.46°N 105.68°W
- Elevation8,675 ft (2,644 m)
On October 23, the normal high in Grant is 51°F and the normal low 23°F, and the chance of measurable rain or snow is 20%.
Normals describe a typical year at the station, not a forecast. The National Weather Service forecast for Grant.
- Jan 34° 9°
- Feb 36° 9°
- Mar 43° 16°
- Apr 49° 22°
- May 59° 30°
- Jun 70° 38°
- Jul 75° 43°
- Aug 72° 42°
- Sep 66° 35°
- Oct 54° 25°
- Nov 42° 17°
- Dec 33° 9°
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 Grant each month?
July is the warmest month, with normal highs of 75°F; December the coldest, with normal lows of 9°F. The most precipitation falls in July (2.58 in), the least in January (0.56 in).
| Month | High | Low | Mean | Precip. | Snow | Wet days | 90°F days | Freezing nights | Daylight |
|---|---|---|---|---|---|---|---|---|---|
| January | 34°F | 9°F | 21.5°F | 0.56 | 9.9 | 6 | <1 | 31 | 9 h 40 min |
| February | 36°F | 9°F | 22.5°F | 0.65 | 10.4 | 7 | <1 | 28 | 10 h 40 min |
| March | 43°F | 16°F | 29.8°F | 1.04 | 15.3 | 8 | <1 | 31 | 11 h 50 min |
| April | 49°F | 22°F | 35.7°F | 1.50 | 13.8 | 9 | <1 | 29 | 13 h 10 min |
| May | 59°F | 30°F | 44.5°F | 1.73 | 4.8 | 10 | <1 | 19 | 14 h 20 min |
| June | 70°F | 38°F | 53.9°F | 1.43 | 0.1 | 9 | <1 | 3 | 15 h |
| July | 75°F | 43°F | 59.1°F | 2.58 | 0.0 | 14 | <1 | <1 | 14 h 40 min |
| August | 72°F | 42°F | 56.9°F | 2.25 | 0.0 | 15 | <1 | <1 | 13 h 50 min |
| September | 66°F | 35°F | 50.1°F | 1.44 | 0.8 | 9 | <1 | 9 | 12 h 30 min |
| October | 54°F | 25°F | 39.8°F | 0.96 | 5.5 | 7 | <1 | 26 | 11 h 10 min |
| November | 42°F | 17°F | 29.1°F | 0.65 | 9.6 | 6 | <1 | 30 | 10 h |
| December | 33°F | 9°F | 21.1°F | 0.60 | 11.8 | 7 | <1 | 31 | 9 h 20 min |
| Year (annual) | 53°F | 25°F | 38.7°F | 15.39 | 82.0 | 105 | <1 | 236 |
The same normals in °C and millimetres
| Month | High | Low | Mean | Precip. | Snow |
|---|---|---|---|---|---|
| January | 1°C | −13°C | −5.8°C | 14 mm | 25 cm |
| February | 2°C | −13°C | −5.3°C | 17 mm | 26 cm |
| March | 6°C | −9°C | −1.2°C | 26 mm | 39 cm |
| April | 9°C | −5°C | 2.1°C | 38 mm | 35 cm |
| May | 15°C | −1°C | 6.9°C | 44 mm | 12 cm |
| June | 21°C | 3°C | 12.2°C | 36 mm | 0 cm |
| July | 24°C | 6°C | 15.1°C | 66 mm | 0 cm |
| August | 22°C | 5°C | 13.8°C | 57 mm | 0 cm |
| September | 19°C | 1°C | 10.1°C | 37 mm | 2 cm |
| October | 12°C | −4°C | 4.3°C | 24 mm | 14 cm |
| November | 5°C | −9°C | −1.6°C | 17 mm | 24 cm |
| December | 1°C | −13°C | −6.1°C | 15 mm | 30 cm |
Source: NOAA NCEI 1991-2020 monthly normals, station USC00053530; 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 Grant?
Normal highs sit between 65°F and 85°F in June, July, August and September. Of those, June has the fewest days with rain (9).
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 USC00053530.
When is the last frost at Grant?
In Grant, the last spring frost (32°F) comes after June 15 in half of years and after June 30 in one year in ten; the first autumn frost comes before September 9 in half of years and before August 26 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
- June 151 year in 10 after June 30; 9 in 10 after June 1
- First autumn frost, half of years before
- September 91 year in 10 before August 26; 9 in 10 before September 22
NOAA puts the median frost-free season at 84 days, and the season without a hard freeze (28°F) at 116 days.
A hard freeze (28°F) comes after May 30 in half of springs and before September 22 in half of autumns.
The USDA's 2023 Plant Hardiness Zone Map puts Grant in zone 5b in ZIP code 80475, the nearest ZIP area. By the map's own method, the average of each year's coldest night over 1991-2020, the station is in zone 5b: the coldest night of a typical year reaches −14°F (30 complete years).
Frost dates for every NOAA station in Colorado · Frost dates by ZIP code
Source: NOAA NCEI 1991-2020 annual normals (frost probabilities), station USC00053530; 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 at Grant?
In a normal year in Grant, a 90°F day is rare, 236 nights fall to 32°F or colder and 105 days bring measurable precipitation.
- Days at 90°F or more
- fewer than 1a normal year
- Days at 100°F or more
- fewer than 1a normal year
- Nights at 32°F or colder
- 236a normal year
- Days that stay below freezing
- 45high of 32°F or less
- Days with 0.01 inch of precipitation
- 105a normal year
- Days with 1 inch of snow or more
- 29a normal year
The highest temperature in this station's record (since 1963) is 90°F, on June 26, 1994; the lowest is −30°F, on February 5, 1982.
The wettest calendar year on that record is 2015, with 20.74 in; the snowiest season is 1964–65, with 172.2 inches.
Source: NOAA NCEI 1991-2020 annual normals, station USC00053530; records: ACIS (NOAA Regional Climate Centers), station USC00053530. Records use complete months only; a month missing more than three days is left out.
How sunny is it at Grant?
Over a year 77% of the sunlight that would reach the ground under clear skies gets through the clouds at Grant, 4.7 kWh per square metre a day. February is the sunniest month (82%) and May the cloudiest (71%).
| Month | Share of clear-sky sunshine | Sunshine, kWh/m² a day |
|---|---|---|
| January | 81% | 2.7 |
| February | 82% | 3.8 |
| March | 79% | 4.9 |
| April | 73% | 5.6 |
| May | 71% | 6.2 |
| June | 78% | 7.0 |
| July | 75% | 6.4 |
| August | 75% | 5.8 |
| September | 81% | 5.2 |
| October | 80% | 3.9 |
| November | 79% | 2.8 |
| December | 79% | 2.4 |
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 Grant record?
A normal year at Grant brings 9,581 heating degree days, 78% more than the median U.S. place (5,373), and 2 cooling degree days, 100% fewer than the median (908). Ten months need 300 or more heating degree days, a monthly mean of about 55°F or colder. For gardens and crops, NOAA counts 746 growing degree days a year above 50°F.
| Month | Heating | Cooling |
|---|---|---|
| January | 1,350 | 0 |
| February | 1,191 | 0 |
| March | 1,091 | 0 |
| April | 879 | 0 |
| May | 637 | 0 |
| June | 332 | 0 |
| July | 184 | 1 |
| August | 251 | 0 |
| September | 446 | 0 |
| October | 781 | 0 |
| November | 1,077 | 0 |
| December | 1,361 | 0 |
| Year (annual) | 9,581 | 2 |
Source: NOAA NCEI 1991-2020 monthly normals, station USC00053530. 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 Grant been warmer than normal?
2024 averaged 40.2°F, 1.5°F above the 1991-2020 normal of 38.7°F. 2 of the 4 complete years since 2021 ran warmer than the normal.
| Year | Mean | Against normal | Precip. | Snow |
|---|---|---|---|---|
| 2021 | 39.8°F | +1.1°F | 16.19 | 73.5 |
| 2022 | 38.4°F | −0.3°F | 18.24 | 112.2 |
| 2023 | 38.4°F | −0.3°F | 16.47 | 74.3 |
| 2024 | 40.2°F | +1.5°F | 16.08 | 104.4 |
Over 55 complete years from 1964 to 2025, the station's annual mean temperature rose at a fitted 4.3°F per century (+0.24°C per decade). A fitted rate summarizes the whole record; single years swing well above and below it.
Source: observed years: ACIS, station USC00053530; trend: NOAA GHCN-Monthly v4. A year counts only with all twelve months complete.
How does Grant's climate compare?
Grant is warmer than 13 of the 125 places with their own NOAA record in Colorado, and wetter than 61. Across the 7,247 U.S. stations with normals, its annual mean of 38.7°F is warmer than 4%.
In the Köppen classification computed from these normals, Grant 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.
Questions about Grant's climate
What is the coldest month at Grant?
December, with a normal high of 33°F and a normal low of 9°F. The warmest is July (75°F by day, 43°F at night).
Does it snow at Grant?
Yes: 82 inches in a normal year, falling on 42 days with 0.1 inch or more, the most in March (15.3 inches).
What is the rainiest month at Grant?
July, with 2.58 in of precipitation in a normal year; the driest is January with 0.56 in.
What plant hardiness zone is Grant in?
The USDA's 2023 map puts Grant in zone 5b in ZIP code 80475, the nearest ZIP area. By the same method at the station, the coldest night of a typical year reaches −14°F (30 years, 1991-2020): zone 5b.
How late can frost come at Grant?
In half of years the last 32°F night comes after June 15; in one year in ten it comes after June 30. Waiting until June 30 leaves about a one-in-ten chance of a later frost.
Nearby and next
- Colorado climateThe statewide normals and every place in the state
- Bailey, CO11 miles from this station, 41.1°F a year
- Cabin Creek, CO14 miles from this station, 37.5°F a year
- Georgetown, CO17 miles from this station, 42.2°F a year
- Dillon, CO22 miles from this station, 35.5°F a year
- Compare two placesMonth by month, side by side
Download these normals (CSV) · JSON · How these figures are made