Collbran, Colorado climate: Normal weather by month, frost dates and records
Collbran's normal year runs from 11°F January nights to 89°F July afternoons, with 15.3 inches of precipitation and 60 inches of snow a year. (NOAA 1991-2020 normals)
In metric: a yearly mean of 8.7°C, January lows of −12°C, July highs of 31°C, 388 mm of precipitation a year.
- NOAA stationCollbran (1 mi WSW)
- Station IDUSC00051743
- Location39.24°N 107.98°W
- Elevation6,009 ft (1,832 m)
- Population365
On October 23, the normal high in Collbran is 62°F and the normal low 30°F, and the chance of measurable rain or snow is 25%.
Normals describe a typical year at the station, not a forecast. The National Weather Service forecast for Collbran.
- Jan 37° 11°
- Feb 43° 17°
- Mar 54° 26°
- Apr 61° 32°
- May 71° 40°
- Jun 83° 48°
- Jul 89° 54°
- Aug 87° 53°
- Sep 78° 45°
- Oct 65° 33°
- Nov 50° 23°
- Dec 36° 12°
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 Collbran each month?
July is the warmest month, with normal highs of 89°F; January the coldest, with normal lows of 11°F. The most precipitation falls in October (1.62 in), the least in June (0.85 in).
| Month | High | Low | Mean | Precip. | Snow | Wet days | 90°F days | Freezing nights | Daylight |
|---|---|---|---|---|---|---|---|---|---|
| January | 37°F | 11°F | 23.9°F | 1.04 | 12.5 | 8 | <1 | 31 | 9 h 40 min |
| February | 43°F | 17°F | 29.9°F | 1.05 | 11.5 | 8 | <1 | 27 | 10 h 40 min |
| March | 54°F | 26°F | 39.6°F | 1.10 | 7.5 | 8 | <1 | 26 | 11 h 50 min |
| April | 61°F | 32°F | 46.3°F | 1.51 | 4.1 | 8 | <1 | 17 | 13 h 10 min |
| May | 71°F | 40°F | 55.1°F | 1.36 | 1.1 | 8 | <1 | 6 | 14 h 20 min |
| June | 83°F | 48°F | 65.2°F | 0.85 | 0.0 | 4 | 8 | <1 | 14 h 50 min |
| July | 89°F | 54°F | 71.4°F | 1.52 | 0.0 | 9 | 19 | <1 | 14 h 40 min |
| August | 87°F | 53°F | 69.6°F | 1.36 | 0.0 | 10 | 11 | <1 | 13 h 50 min |
| September | 78°F | 45°F | 61.5°F | 1.61 | 0.0 | 8 | 2 | 2 | 12 h 30 min |
| October | 65°F | 33°F | 48.6°F | 1.62 | 2.2 | 8 | <1 | 15 | 11 h 10 min |
| November | 50°F | 23°F | 36.1°F | 1.29 | 7.8 | 7 | <1 | 27 | 10 h |
| December | 36°F | 12°F | 24.3°F | 0.96 | 12.9 | 9 | <1 | 31 | 9 h 30 min |
| Year (annual) | 63°F | 33°F | 47.6°F | 15.27 | 59.6 | 95 | 40 | 182 |
The same normals in °C and millimetres
| Month | High | Low | Mean | Precip. | Snow |
|---|---|---|---|---|---|
| January | 3°C | −12°C | −4.5°C | 26 mm | 32 cm |
| February | 6°C | −8°C | −1.2°C | 27 mm | 29 cm |
| March | 12°C | −4°C | 4.2°C | 28 mm | 19 cm |
| April | 16°C | 0°C | 7.9°C | 38 mm | 10 cm |
| May | 22°C | 4°C | 12.8°C | 35 mm | 3 cm |
| June | 28°C | 9°C | 18.4°C | 22 mm | 0 cm |
| July | 31°C | 12°C | 21.9°C | 39 mm | 0 cm |
| August | 30°C | 12°C | 20.9°C | 35 mm | 0 cm |
| September | 26°C | 7°C | 16.4°C | 41 mm | 0 cm |
| October | 18°C | 0°C | 9.2°C | 41 mm | 6 cm |
| November | 10°C | −5°C | 2.3°C | 33 mm | 20 cm |
| December | 2°C | −11°C | −4.3°C | 24 mm | 33 cm |
Source: NOAA NCEI 1991-2020 monthly normals, station USC00051743; 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 Collbran?
Normal highs sit between 65°F and 85°F in May, June and September. 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 USC00051743.
When is the last frost in Collbran?
In Collbran, the last spring frost (32°F) comes after May 17 in half of years and after June 3 in one year in ten; the first autumn frost comes before September 30 in half of years and before September 18 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 3; 9 in 10 after May 2
- First autumn frost, half of years before
- September 301 year in 10 before September 18; 9 in 10 before October 12
NOAA puts the median frost-free season at 136 days, and the season without a hard freeze (28°F) at 159 days.
A hard freeze (28°F) comes after May 3 in half of springs and before October 9 in half of autumns.
The USDA's 2023 Plant Hardiness Zone Map puts Collbran in zone 5b in ZIP code 81646, the nearest ZIP area. By the map's own method, the average of each year's coldest night over 1991-2020, Collbran's NOAA station is in zone 5b: the coldest night of a typical year reaches −13°F (20 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 USC00051743; 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 Collbran?
In a normal year in Collbran, 40 days a year reach 90°F, 182 nights fall to 32°F or colder and 95 days bring measurable precipitation.
- Days at 90°F or more
- 40a normal year
- Days at 100°F or more
- fewer than 1a normal year
- Nights at 32°F or colder
- 182a normal year
- Days that stay below freezing
- 22high of 32°F or less
- Days with 0.01 inch of precipitation
- 95a normal year
- Days with 1 inch of snow or more
- 20a normal year
The highest temperature in this station's record (since 2000) is 102°F, on June 18, 2021; the lowest is −24°F, on December 5, 2013.
The wettest calendar year on that record is 2005, with 21.00 in; the snowiest season is 2022–23, with 110.2 inches.
Source: NOAA NCEI 1991-2020 annual normals, station USC00051743; records: ACIS (NOAA Regional Climate Centers), station USC00051743. Records use complete months only; a month missing more than three days is left out.
How sunny is Collbran?
Over a year 77% of the sunlight that would reach the ground under clear skies gets through the clouds in the area around Collbran, 4.8 kWh per square metre a day. June is the sunniest month (84%) and December the cloudiest (70%).
| Month | Share of clear-sky sunshine | Sunshine, kWh/m² a day |
|---|---|---|
| January | 74% | 2.5 |
| February | 72% | 3.4 |
| March | 77% | 4.9 |
| April | 73% | 5.7 |
| May | 73% | 6.5 |
| June | 84% | 7.7 |
| July | 81% | 7.0 |
| August | 79% | 6.2 |
| September | 82% | 5.3 |
| October | 77% | 3.8 |
| November | 75% | 2.7 |
| December | 70% | 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 Collbran need?
A normal year in Collbran brings 6,786 heating degree days, 26% more than the median U.S. place (5,373), and 481 cooling degree days, 47% 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 2,423 growing degree days a year above 50°F.
| Month | Heating | Cooling |
|---|---|---|
| January | 1,274 | 0 |
| February | 984 | 0 |
| March | 786 | 0 |
| April | 561 | 0 |
| May | 313 | 8 |
| June | 75 | 81 |
| July | 4 | 204 |
| August | 12 | 154 |
| September | 139 | 34 |
| October | 508 | 0 |
| November | 867 | 0 |
| December | 1,263 | 0 |
| Year (annual) | 6,786 | 481 |
Source: NOAA NCEI 1991-2020 monthly normals, station USC00051743. 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 Collbran been warmer than normal lately?
2023 averaged 46.9°F, 0.7°F below the 1991-2020 normal of 47.6°F. 1 of the 3 complete years since 2021 ran warmer than the normal.
| Year | Mean | Against normal | Precip. | Snow |
|---|---|---|---|---|
| 2021 | 49.2°F | +1.6°F | 13.95 | 43.1 |
| 2022 | 47.4°F | −0.3°F | 14.35 | 79.5 |
| 2023 | 46.9°F | −0.7°F | 16.08 | 93.3 |
Source: observed years: ACIS, station USC00051743. A year counts only with all twelve months complete.
How does Collbran's climate compare?
Collbran is warmer than 53 of the other 124 places with their own NOAA record in Colorado, and wetter than 59. Across the 7,247 U.S. stations with normals, its annual mean of 47.6°F is warmer than 30%.
In the Köppen classification computed from these normals, Collbran 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.
Which places near Collbran 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.
- Battlement Mesa, CO5,402 people · 15 mi N
- Parachute, CO1,362 people · 15 mi N
- De Beque, CO478 people · 13 mi NW
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 Collbran's climate
What is the coldest month in Collbran?
January, with a normal high of 37°F and a normal low of 11°F. The warmest is July (89°F by day, 54°F at night).
Does it snow in Collbran?
Yes: 60 inches in a normal year, falling on 33 days with 0.1 inch or more, the most in December (12.9 inches).
What is the rainiest month in Collbran?
October, with 1.62 in of precipitation in a normal year; the driest is June with 0.85 in.
What plant hardiness zone is Collbran in?
The USDA's 2023 map puts Collbran in zone 5b in ZIP code 81646, the nearest ZIP area. By the same method at Collbran's NOAA station, the coldest night of a typical year reaches −13°F (20 years, 1991-2020): zone 5b.
How late can frost come in Collbran?
In half of years the last 32°F night comes after May 17; in one year in ten it comes after June 3. Waiting until June 3 leaves about a one-in-ten chance of a later frost.
Nearby and next
- Colorado climateThe statewide normals and every place in the state
- Bonham Reservoir, CO10 miles from this station, 33.1°F a year
- Palisade, CO22 miles from this station, 54.4°F a year
- Cedaredge, CO24 miles from this station, 48.8°F a year
- Rifle, CO24 miles from this station, 49.1°F a year
- Compare two placesMonth by month, side by side
Download these normals (CSV) · JSON · How these figures are made