Roxborough State Park, Colorado climate: Climate normals at a NOAA weather station
Roxborough State Park's normal year runs from 18°F December nights to 85°F July afternoons, with 20.9 inches of precipitation a year. (NOAA 1991-2020 normals)
In metric: a yearly mean of 9.8°C, December lows of −8°C, July highs of 30°C, 532 mm of precipitation a year.
- NOAA stationRoxborough State Park
- Station IDUSC00057249
- Location39.43°N 105.07°W
- Elevation6,117 ft (1,865 m)
On October 23, the normal high in Roxborough State Park is 62°F and the normal low 33°F.
Normals describe a typical year at the station, not a forecast. The National Weather Service forecast for Roxborough State Park.
- Jan 46° 19°
- Feb 46° 19°
- Mar 54° 26°
- Apr 59° 32°
- May 68° 41°
- Jun 79° 50°
- Jul 85° 58°
- Aug 83° 57°
- Sep 77° 48°
- Oct 65° 36°
- Nov 54° 26°
- Dec 46° 18°
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 Roxborough State Park each month?
July is the warmest month, with normal highs of 85°F; December the coldest, with normal lows of 18°F. The most precipitation falls in April (2.83 in), the least in January (0.83 in).
| Month | High | Low | Mean | Precip. | Wet days | 90°F days | Freezing nights | Daylight |
|---|---|---|---|---|---|---|---|---|
| January | 46°F | 19°F | 32.6°F | 0.83 | – | <1 | 28 | 9 h 40 min |
| February | 46°F | 19°F | 32.6°F | 1.03 | – | <1 | 26 | 10 h 40 min |
| March | 54°F | 26°F | 39.8°F | 1.94 | – | <1 | 24 | 11 h 50 min |
| April | 59°F | 32°F | 45.6°F | 2.83 | – | <1 | 17 | 13 h 10 min |
| May | 68°F | 41°F | 54.6°F | 2.62 | – | <1 | 6 | 14 h 20 min |
| June | 79°F | 50°F | 64.5°F | 2.09 | – | 3 | <1 | 15 h |
| July | 85°F | 58°F | 71.8°F | 2.26 | – | 11 | <1 | 14 h 40 min |
| August | 83°F | 57°F | 70.2°F | 2.33 | – | 6 | <1 | 13 h 50 min |
| September | 77°F | 48°F | 62.4°F | 1.62 | – | 2 | 2 | 12 h 30 min |
| October | 65°F | 36°F | 50.0°F | 1.35 | – | <1 | 12 | 11 h 10 min |
| November | 54°F | 26°F | 39.8°F | 1.10 | – | <1 | 22 | 10 h |
| December | 46°F | 18°F | 31.8°F | 0.94 | – | <1 | 28 | 9 h 20 min |
| Year (annual) | 63°F | 36°F | 49.6°F | 20.94 | – | 22 | 165 |
The same normals in °C and millimetres
| Month | High | Low | Mean | Precip. |
|---|---|---|---|---|
| January | 8°C | −7°C | 0.3°C | 21 mm |
| February | 8°C | −7°C | 0.3°C | 26 mm |
| March | 12°C | −3°C | 4.3°C | 49 mm |
| April | 15°C | 0°C | 7.6°C | 72 mm |
| May | 20°C | 5°C | 12.6°C | 67 mm |
| June | 26°C | 10°C | 18.1°C | 53 mm |
| July | 30°C | 15°C | 22.1°C | 57 mm |
| August | 29°C | 14°C | 21.2°C | 59 mm |
| September | 25°C | 9°C | 16.9°C | 41 mm |
| October | 18°C | 2°C | 10.0°C | 34 mm |
| November | 12°C | −3°C | 4.3°C | 28 mm |
| December | 8°C | −8°C | −0.1°C | 24 mm |
NOAA publishes no 1991-2020 snowfall normal for this station. The nearest record that keeps one, Strontia Springs Dam (3 miles away), gets 86 inches of snow in a normal year; elevation and distance can change that.
Source: NOAA NCEI 1991-2020 monthly normals, station USC00057249; 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 Roxborough State Park?
Normal highs sit between 65°F and 85°F in May, June, 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 USC00057249.
When is the last frost at Roxborough State Park?
In Roxborough State Park, the last spring frost (32°F) comes after May 16 in half of years and after June 1 in one year in ten; the first autumn frost comes before October 1 in half of years and before September 17 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 161 year in 10 after June 1; 9 in 10 after May 2
- First autumn frost, half of years before
- October 11 year in 10 before September 17; 9 in 10 before October 15
NOAA puts the median frost-free season at 136 days, and the season without a hard freeze (28°F) at 157 days.
A hard freeze (28°F) comes after May 5 in half of springs and before October 11 in half of autumns.
The USDA's 2023 Plant Hardiness Zone Map puts Roxborough State Park in zone 5b in ZIP code 80125, the nearest ZIP area.
Frost dates for every NOAA station in Colorado · Frost dates by ZIP code
Source: NOAA NCEI 1991-2020 annual normals (frost probabilities), station USC00057249; 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 at Roxborough State Park?
In a normal year in Roxborough State Park, 22 days a year reach 90°F and 165 nights fall to 32°F or colder.
- Days at 90°F or more
- 22a normal year
- Days at 100°F or more
- fewer than 1a normal year
- Nights at 32°F or colder
- 165a normal year
- Days that stay below freezing
- 18high of 32°F or less
Source: NOAA NCEI 1991-2020 annual normals, station USC00057249.
How sunny is it at Roxborough State Park?
Over a year 77% of the sunlight that would reach the ground under clear skies gets through the clouds at Roxborough State Park, 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 Roxborough State Park record?
A normal year at Roxborough State Park brings 6,131 heating degree days, 14% more than the median U.S. place (5,373), and 560 cooling degree days, 38% 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 2,554 growing degree days a year above 50°F.
| Month | Heating | Cooling |
|---|---|---|
| January | 1,005 | 0 |
| February | 907 | 0 |
| March | 781 | 0 |
| April | 584 | 1 |
| May | 336 | 12 |
| June | 95 | 79 |
| July | 9 | 220 |
| August | 21 | 182 |
| September | 143 | 64 |
| October | 466 | 3 |
| November | 758 | 0 |
| December | 1,027 | 0 |
| Year (annual) | 6,131 | 560 |
Source: NOAA NCEI 1991-2020 monthly normals, station USC00057249. 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.
How does Roxborough State Park's climate compare?
Roxborough State Park is warmer than 69 of the 125 places with their own NOAA record in Colorado, and wetter than 110. Across the 7,247 U.S. stations with normals, its annual mean of 49.6°F is warmer than 38%.
In the Köppen classification computed from these normals, Roxborough State Park 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 Roxborough State Park share this climate record?
Roxborough Park has no NOAA station with 1991-2020 normals of its 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.
- Roxborough Park, CO9,365 people · 2 mi N
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 Roxborough State Park's climate
What is the coldest month at Roxborough State Park?
December, with a normal high of 46°F and a normal low of 18°F. The warmest is July (85°F by day, 58°F at night).
Does it snow at Roxborough State Park?
Yes. NOAA publishes no 1991-2020 snowfall normal for the station; the nearest record that keeps one, Strontia Springs Dam (3 miles away), records 86 inches of snow in a normal year.
What is the rainiest month at Roxborough State Park?
April, with 2.83 in of precipitation in a normal year; the driest is January with 0.83 in.
What plant hardiness zone is Roxborough State Park in?
The USDA's 2023 map puts Roxborough State Park in zone 5b in ZIP code 80125, the nearest ZIP area.
How late can frost come at Roxborough State Park?
In half of years the last 32°F night comes after May 16; in one year in ten it comes after June 1. Waiting until June 1 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, CO2 miles from this station, 47.1°F a year
- Kassler, CO4 miles from this station, 50.2°F a year
- Castle Rock, CO9 miles from this station, 49.6°F a year
- Marston Filter Plant, CO13 miles from this station, 50.8°F a year
- Compare two placesMonth by month, side by side
Download these normals (CSV) · JSON · How these figures are made