Antero Reservoir, Colorado climate: Climate normals at a NOAA weather station
Antero Reservoir's normal year runs from −4°F January nights to 76°F July afternoons, with 10.6 inches of precipitation and 49 inches of snow a year. (NOAA 1991-2020 normals)
In metric: a yearly mean of 1.9°C, January lows of −20°C, July highs of 24°C, 268 mm of precipitation a year.
- NOAA stationAntero Reservoir
- Station IDUSC00050263
- Location38.99°N 105.89°W
- Elevation8,939 ft (2,725 m)
On October 23, the normal high in Antero Reservoir is 52°F and the normal low 17°F, and the chance of measurable rain or snow is 15%.
Normals describe a typical year at the station, not a forecast. The National Weather Service forecast for Antero Reservoir.
- Jan 32° -4°
- Feb 34° -1°
- Mar 42° 10°
- Apr 49° 19°
- May 59° 27°
- Jun 70° 34°
- Jul 76° 41°
- Aug 73° 39°
- Sep 67° 30°
- Oct 55° 19°
- Nov 42° 9°
- Dec 32° -2°
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 Antero Reservoir each month?
July is the warmest month, with normal highs of 76°F; January the coldest, with normal lows of −4°F. The most precipitation falls in August (2.18 in), the least in January (0.28 in).
| Month | High | Low | Mean | Precip. | Snow | Wet days | 90°F days | Freezing nights | Daylight |
|---|---|---|---|---|---|---|---|---|---|
| January | 32°F | −4°F | 13.7°F | 0.28 | 5.4 | 3 | <1 | 31 | 9 h 40 min |
| February | 34°F | −1°F | 16.3°F | 0.36 | 6.2 | 4 | <1 | 28 | 10 h 40 min |
| March | 42°F | 10°F | 26.1°F | 0.54 | 8.3 | 5 | <1 | 31 | 11 h 50 min |
| April | 49°F | 19°F | 33.8°F | 0.67 | 9.3 | 6 | <1 | 29 | 13 h 10 min |
| May | 59°F | 27°F | 43.1°F | 1.24 | 4.0 | 7 | <1 | 24 | 14 h 20 min |
| June | 70°F | 34°F | 52.4°F | 0.90 | 0.0 | 6 | <1 | 10 | 14 h 50 min |
| July | 76°F | 41°F | 58.1°F | 1.96 | 0.0 | 12 | <1 | 1 | 14 h 40 min |
| August | 73°F | 39°F | 56.0°F | 2.18 | 0.0 | 13 | <1 | 2 | 13 h 40 min |
| September | 67°F | 30°F | 48.6°F | 1.03 | 0.4 | 7 | <1 | 18 | 12 h 30 min |
| October | 55°F | 19°F | 37.1°F | 0.70 | 4.2 | 5 | <1 | 29 | 11 h 10 min |
| November | 42°F | 9°F | 25.5°F | 0.33 | 4.9 | 4 | <1 | 30 | 10 h 10 min |
| December | 32°F | −2°F | 14.6°F | 0.37 | 6.5 | 4 | <1 | 31 | 9 h 30 min |
| Year (annual) | 52°F | 18°F | 35.4°F | 10.56 | 49.2 | 75 | <1 | 263 |
The same normals in °C and millimetres
| Month | High | Low | Mean | Precip. | Snow |
|---|---|---|---|---|---|
| January | 0°C | −20°C | −10.2°C | 7 mm | 14 cm |
| February | 1°C | −18°C | −8.7°C | 9 mm | 16 cm |
| March | 5°C | −12°C | −3.3°C | 14 mm | 21 cm |
| April | 9°C | −7°C | 1.0°C | 17 mm | 24 cm |
| May | 15°C | −3°C | 6.2°C | 31 mm | 10 cm |
| June | 21°C | 1°C | 11.3°C | 23 mm | 0 cm |
| July | 24°C | 5°C | 14.5°C | 50 mm | 0 cm |
| August | 23°C | 4°C | 13.3°C | 55 mm | 0 cm |
| September | 19°C | −1°C | 9.2°C | 26 mm | 1 cm |
| October | 13°C | −7°C | 2.8°C | 18 mm | 11 cm |
| November | 6°C | −13°C | −3.6°C | 8 mm | 12 cm |
| December | 0°C | −19°C | −9.7°C | 9 mm | 17 cm |
Source: NOAA NCEI 1991-2020 monthly normals, station USC00050263; 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 Antero Reservoir?
Normal highs sit between 65°F and 85°F in June, July, August and September. Of those, June 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 USC00050263.
How hot and how cold does it get at Antero Reservoir?
In a normal year in Antero Reservoir, a 90°F day is rare, 263 nights fall to 32°F or colder and 75 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
- 263a normal year
- Days that stay below freezing
- 50high of 32°F or less
- Days with 0.01 inch of precipitation
- 75a normal year
- Days with 1 inch of snow or more
- 19a normal year
The highest temperature in this station's record (since 1961) is 88°F, on June 16, 2021; the lowest is −54°F, on January 10, 1962.
The wettest calendar year on that record is 2006, with 14.58 in; the snowiest season is 1964–65, with 99.8 inches.
Source: NOAA NCEI 1991-2020 annual normals, station USC00050263; records: ACIS (NOAA Regional Climate Centers), station USC00050263. Records use complete months only; a month missing more than three days is left out.
How sunny is it at Antero Reservoir?
Over a year 80% of the sunlight that would reach the ground under clear skies gets through the clouds at Antero Reservoir, 5.0 kWh per square metre a day. January is the sunniest month (84%) and May the cloudiest (76%).
| Month | Share of clear-sky sunshine | Sunshine, kWh/m² a day |
|---|---|---|
| January | 84% | 3.0 |
| February | 84% | 4.0 |
| March | 81% | 5.1 |
| April | 77% | 6.0 |
| May | 76% | 6.7 |
| June | 81% | 7.3 |
| July | 77% | 6.5 |
| August | 78% | 6.0 |
| September | 83% | 5.4 |
| October | 84% | 4.2 |
| November | 83% | 3.1 |
| December | 82% | 2.6 |
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 Antero Reservoir record?
A normal year at Antero Reservoir brings 10,756 heating degree days, 2.0 times the median U.S. place (5,373), and 0 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 606 growing degree days a year above 50°F.
| Month | Heating | Cooling |
|---|---|---|
| January | 1,592 | 0 |
| February | 1,364 | 0 |
| March | 1,208 | 0 |
| April | 935 | 0 |
| May | 679 | 0 |
| June | 380 | 0 |
| July | 216 | 0 |
| August | 279 | 0 |
| September | 494 | 0 |
| October | 865 | 0 |
| November | 1,185 | 0 |
| December | 1,562 | 0 |
| Year (annual) | 10,756 | 0 |
Source: NOAA NCEI 1991-2020 monthly normals, station USC00050263. 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 Antero Reservoir been warmer than normal?
2024 averaged 36.6°F, 1.2°F above the 1991-2020 normal of 35.4°F. 3 of the 4 complete years since 2021 ran warmer than the normal.
| Year | Mean | Against normal | Precip. | Snow |
|---|---|---|---|---|
| 2021 | 36.8°F | +1.4°F | 10.37 | 42.1 |
| 2022 | 35.0°F | −0.4°F | 11.78 | 63.9 |
| 2023 | 36.0°F | +0.6°F | 10.70 | 38.0 |
| 2024 | 36.6°F | +1.2°F | 10.75 | 82.5 |
Over 56 complete years from 1963 to 2024, the station's annual mean temperature rose at a fitted 4.0°F per century (+0.22°C per decade). A fitted rate summarizes the whole record; single years swing well above and below it.
Source: observed years: ACIS, station USC00050263; trend: NOAA GHCN-Monthly v4. A year counts only with all twelve months complete.
How does Antero Reservoir's climate compare?
Antero Reservoir is warmer than 4 of the 125 places with their own NOAA record in Colorado, and wetter than 15. Across the 7,247 U.S. stations with normals, its annual mean of 35.4°F is warmer than 2%.
In the Köppen classification computed from these normals, Antero Reservoir is BSk: cold semi-arid steppe. 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 Antero Reservoir share this climate record?
Hartsel 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.
- Hartsel, CO0 people · 5 mi NE
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 Antero Reservoir's climate
What is the coldest month at Antero Reservoir?
January, with a normal high of 32°F and a normal low of −4°F. The warmest is July (76°F by day, 41°F at night).
Does it snow at Antero Reservoir?
Yes: 49 inches in a normal year, falling on 21 days with 0.1 inch or more, the most in April (9.3 inches).
What is the rainiest month at Antero Reservoir?
August, with 2.18 in of precipitation in a normal year; the driest is January with 0.28 in.
What plant hardiness zone is Antero Reservoir in?
The USDA's 2023 map puts Antero Reservoir in zone 4a in ZIP code 80449, the nearest ZIP area. By the same method at the station, the coldest night of a typical year reaches −35°F (27 years, 1991-2020): zone 3b.
Nearby and next
- Colorado climateThe statewide normals and every place in the state
- Fairplay, CO17 miles from this station, 36.7°F a year
- Buena Vista, CO17 miles from this station, 44.7°F a year
- Lake George (8 mi SW), CO24 miles from this station, 38.9°F a year
- Twin Lakes, CO25 miles from this station, 37.7°F a year
- Compare two placesMonth by month, side by side
Download these normals (CSV) · JSON · How these figures are made