Kassler, Colorado climate: Climate normals at a NOAA weather station
Kassler's normal year runs from 17°F December nights to 87°F July afternoons, with 18.2 inches of precipitation and 62 inches of snow a year. (NOAA 1991-2020 normals)
In metric: a yearly mean of 10.1°C, December lows of −9°C, July highs of 30°C, 463 mm of precipitation a year.
- NOAA stationKassler
- Station IDUSC00054452
- Location39.49°N 105.10°W
- Elevation5,587 ft (1,703 m)
On October 23, the normal high in Kassler is 63°F and the normal low 33°F, and the chance of measurable rain or snow is 19%.
Normals describe a typical year at the station, not a forecast. The National Weather Service forecast for Kassler.
- Jan 47° 17°
- Feb 47° 18°
- Mar 55° 26°
- Apr 61° 33°
- May 69° 43°
- Jun 81° 52°
- Jul 87° 59°
- Aug 85° 57°
- Sep 78° 48°
- Oct 66° 36°
- Nov 54° 25°
- Dec 46° 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 at Kassler each month?
July is the warmest month, with normal highs of 87°F; December the coldest, with normal lows of 17°F. The most precipitation falls in May (2.48 in), the least in January (0.61 in).
| Month | High | Low | Mean | Precip. | Snow | Wet days | 90°F days | Freezing nights | Daylight |
|---|---|---|---|---|---|---|---|---|---|
| January | 47°F | 17°F | 31.9°F | 0.61 | 8.7 | 4 | <1 | 29 | 9 h 40 min |
| February | 47°F | 18°F | 32.7°F | 0.74 | 10.4 | 5 | <1 | 26 | 10 h 40 min |
| March | 55°F | 26°F | 40.4°F | 1.68 | 9.6 | 6 | <1 | 22 | 11 h 50 min |
| April | 61°F | 33°F | 46.7°F | 2.36 | 8.5 | 8 | <1 | 14 | 13 h 10 min |
| May | 69°F | 43°F | 56.0°F | 2.48 | 1.2 | 10 | 1 | 3 | 14 h 20 min |
| June | 81°F | 52°F | 66.5°F | 1.82 | 0.0 | 8 | 7 | <1 | 15 h |
| July | 87°F | 59°F | 72.8°F | 1.71 | 0.0 | 9 | 14 | <1 | 14 h 40 min |
| August | 85°F | 57°F | 70.9°F | 2.01 | 0.0 | 10 | 11 | <1 | 13 h 50 min |
| September | 78°F | 48°F | 62.8°F | 1.69 | 0.6 | 7 | 3 | 1 | 12 h 30 min |
| October | 66°F | 36°F | 50.6°F | 1.49 | 3.7 | 6 | <1 | 10 | 11 h 10 min |
| November | 54°F | 25°F | 39.7°F | 0.92 | 7.9 | 5 | <1 | 23 | 10 h |
| December | 46°F | 17°F | 31.2°F | 0.73 | 11.6 | 4 | <1 | 29 | 9 h 20 min |
| Year (annual) | 65°F | 36°F | 50.2°F | 18.24 | 62.2 | 81 | 36 | 156 |
The same normals in °C and millimetres
| Month | High | Low | Mean | Precip. | Snow |
|---|---|---|---|---|---|
| January | 8°C | −8°C | −0.1°C | 15 mm | 22 cm |
| February | 9°C | −8°C | 0.4°C | 19 mm | 26 cm |
| March | 13°C | −3°C | 4.7°C | 43 mm | 24 cm |
| April | 16°C | 0°C | 8.2°C | 60 mm | 22 cm |
| May | 21°C | 6°C | 13.3°C | 63 mm | 3 cm |
| June | 27°C | 11°C | 19.2°C | 46 mm | 0 cm |
| July | 30°C | 15°C | 22.7°C | 43 mm | 0 cm |
| August | 29°C | 14°C | 21.6°C | 51 mm | 0 cm |
| September | 25°C | 9°C | 17.1°C | 43 mm | 2 cm |
| October | 19°C | 2°C | 10.3°C | 38 mm | 9 cm |
| November | 12°C | −4°C | 4.3°C | 23 mm | 20 cm |
| December | 8°C | −9°C | −0.4°C | 19 mm | 29 cm |
Source: NOAA NCEI 1991-2020 monthly normals, station USC00054452; 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 Kassler?
Normal highs sit between 65°F and 85°F in May, June, August, September and October. Of those, October has the fewest days with rain (6).
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 USC00054452.
When is the last frost at Kassler?
In Kassler, the last spring frost (32°F) comes after May 8 in half of years and after May 22 in one year in ten; the first autumn frost comes before October 3 in half of years and before September 21 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 81 year in 10 after May 22; 9 in 10 after April 27
- First autumn frost, half of years before
- October 31 year in 10 before September 21; 9 in 10 before October 17
NOAA puts the median frost-free season at 147 days, and the season without a hard freeze (28°F) at 167 days.
A hard freeze (28°F) comes after April 29 in half of springs and before October 13 in half of autumns.
The USDA's 2023 Plant Hardiness Zone Map puts Kassler in zone 5b in ZIP code 80125, 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 −12°F (27 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 USC00054452; 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 Kassler?
In a normal year in Kassler, 36 days a year reach 90°F (1 of them 100°F or more), 156 nights fall to 32°F or colder and 81 days bring measurable precipitation.
- Days at 90°F or more
- 36a normal year
- Days at 100°F or more
- 1a normal year
- Nights at 32°F or colder
- 156a normal year
- Days that stay below freezing
- 16high of 32°F or less
- Days with 0.01 inch of precipitation
- 81a normal year
- Days with 1 inch of snow or more
- 20a normal year
The highest temperature in this station's record (since 1918) is 105°F, on June 27, 1994; the lowest is −32°F, on January 17, 1930.
The wettest calendar year on that record is 1969, with 28.11 in; the snowiest season is 1972–73, with 156.5 inches.
Source: NOAA NCEI 1991-2020 annual normals, station USC00054452; records: ACIS (NOAA Regional Climate Centers), station USC00054452. Records use complete months only; a month missing more than three days is left out.
How sunny is it at Kassler?
Over a year 77% of the sunlight that would reach the ground under clear skies gets through the clouds at Kassler, 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 Kassler record?
A normal year at Kassler brings 6,013 heating degree days, 12% more than the median U.S. place (5,373), and 645 cooling degree days, 29% 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 2,743 growing degree days a year above 50°F.
| Month | Heating | Cooling |
|---|---|---|
| January | 1,026 | 0 |
| February | 904 | 0 |
| March | 763 | 0 |
| April | 551 | 1 |
| May | 296 | 15 |
| June | 66 | 112 |
| July | 8 | 248 |
| August | 16 | 199 |
| September | 131 | 66 |
| October | 449 | 4 |
| November | 758 | 0 |
| December | 1,046 | 0 |
| Year (annual) | 6,013 | 645 |
Source: NOAA NCEI 1991-2020 monthly normals, station USC00054452. 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 Kassler been warmer than normal?
2025 averaged 52.7°F, 2.5°F above the 1991-2020 normal of 50.2°F. 5 of the 5 complete years since 2021 ran warmer than the normal.
| Year | Mean | Against normal | Precip. | Snow |
|---|---|---|---|---|
| 2021 | 51.8°F | +1.6°F | 17.16 | 71.6 |
| 2022 | 51.0°F | +0.8°F | 16.41 | 81.1 |
| 2023 | 50.9°F | +0.7°F | 23.02 | 45.8 |
| 2024 | 53.3°F | +3.1°F | 17.99 | 59.8 |
| 2025 | 52.7°F | +2.5°F | 15.29 | 47.0 |
Over 69 complete years from 1919 to 2025, the station's annual mean temperature rose at a fitted 1.8°F per century (+0.10°C per decade). A fitted rate summarizes the whole record; single years swing well above and below it.
Source: observed years: ACIS, station USC00054452; trend: NOAA GHCN-Monthly v4. A year counts only with all twelve months complete.
How does Kassler's climate compare?
Kassler is warmer than 78 of the 125 places with their own NOAA record in Colorado, and wetter than 95. Across the 7,247 U.S. stations with normals, its annual mean of 50.2°F is warmer than 41%.
In the Köppen classification computed from these normals, Kassler 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 Kassler share this climate record?
2 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.
- Sterling Ranch, CO2,530 people · 3 mi E
- Louviers, CO274 people · 5 mi E
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 Kassler's climate
What is the coldest month at Kassler?
December, with a normal high of 46°F and a normal low of 17°F. The warmest is July (87°F by day, 59°F at night).
Does it snow at Kassler?
Yes: 62 inches in a normal year, falling on 23 days with 0.1 inch or more, the most in December (11.6 inches).
What is the rainiest month at Kassler?
May, with 2.48 in of precipitation in a normal year; the driest is January with 0.61 in.
What plant hardiness zone is Kassler in?
The USDA's 2023 map puts Kassler in zone 5b in ZIP code 80125, the nearest ZIP area. By the same method at the station, the coldest night of a typical year reaches −12°F (27 years, 1991-2020): zone 5b.
How late can frost come at Kassler?
In half of years the last 32°F night comes after May 8; in one year in ten it comes after May 22. Waiting until May 22 leaves about a one-in-ten chance of a later frost.
Nearby and next
- Colorado climateThe statewide normals and every place in the state
- Strontia Springs Dam, CO4 miles from this station, 47.1°F a year
- Roxborough State Park, CO4 miles from this station, 49.6°F a year
- Marston Filter Plant, CO9 miles from this station, 50.8°F a year
- Castle Rock, CO12 miles from this station, 49.6°F a year
- Compare two placesMonth by month, side by side
Download these normals (CSV) · JSON · How these figures are made