Flagler, Colorado climate: Normal weather by month, frost dates and records
Flagler's normal year runs from 17°F December nights to 89°F July afternoons, with 16.5 inches of precipitation and 25 inches of snow a year. (NOAA 1991-2020 normals)
In metric: a yearly mean of 10.7°C, December lows of −8°C, July highs of 32°C, 419 mm of precipitation a year.
- NOAA stationFlagler (1 mi S)
- Station IDUSC00052932
- Location39.28°N 103.06°W
- Elevation4,921 ft (1,500 m)
- Population583
On October 23, the normal high in Flagler is 63°F and the normal low 33°F, and the chance of measurable rain or snow is 8%.
Normals describe a typical year at the station, not a forecast. The National Weather Service forecast for Flagler.
- Jan 45° 17°
- Feb 47° 19°
- Mar 57° 27°
- Apr 64° 35°
- May 73° 44°
- Jun 85° 54°
- Jul 89° 60°
- Aug 87° 58°
- Sep 79° 49°
- Oct 66° 36°
- Nov 54° 26°
- Dec 44° 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 in Flagler each month?
July is the warmest month, with normal highs of 89°F; December the coldest, with normal lows of 17°F. The most precipitation falls in July (3.06 in), the least in November (0.29 in).
| Month | High | Low | Mean | Precip. | Snow | Wet days | 90°F days | Freezing nights | Daylight |
|---|---|---|---|---|---|---|---|---|---|
| January | 45°F | 17°F | 31.1°F | 0.34 | 5.1 | 2 | <1 | 30 | 9 h 40 min |
| February | 47°F | 19°F | 33.0°F | 0.31 | 3.8 | 2 | <1 | 27 | 10 h 40 min |
| March | 57°F | 27°F | 41.8°F | 0.80 | 3.9 | 4 | <1 | 25 | 11 h 50 min |
| April | 64°F | 35°F | 49.1°F | 1.37 | 3.4 | 4 | <1 | 15 | 13 h 10 min |
| May | 73°F | 44°F | 58.7°F | 2.47 | 0.6 | 6 | 1 | 3 | 14 h 20 min |
| June | 85°F | 54°F | 69.3°F | 2.64 | 0.0 | 6 | 9 | <1 | 14 h 50 min |
| July | 89°F | 60°F | 74.3°F | 3.06 | 0.0 | 7 | 16 | <1 | 14 h 40 min |
| August | 87°F | 58°F | 72.4°F | 2.71 | 0.0 | 6 | 12 | <1 | 13 h 50 min |
| September | 79°F | 49°F | 64.2°F | 1.24 | 0.4 | 3 | 5 | 1 | 12 h 30 min |
| October | 66°F | 36°F | 50.9°F | 0.90 | 1.0 | 3 | <1 | 11 | 11 h 10 min |
| November | 54°F | 26°F | 39.6°F | 0.29 | 2.4 | 2 | <1 | 25 | 10 h |
| December | 44°F | 17°F | 30.4°F | 0.37 | 3.9 | 2 | <1 | 30 | 9 h 30 min |
| Year (annual) | 66°F | 37°F | 51.2°F | 16.50 | 24.5 | 45 | 43 | 167 |
The same normals in °C and millimetres
| Month | High | Low | Mean | Precip. | Snow |
|---|---|---|---|---|---|
| January | 7°C | −8°C | −0.5°C | 9 mm | 13 cm |
| February | 8°C | −7°C | 0.6°C | 8 mm | 10 cm |
| March | 14°C | −3°C | 5.4°C | 20 mm | 10 cm |
| April | 18°C | 1°C | 9.5°C | 35 mm | 9 cm |
| May | 23°C | 7°C | 14.8°C | 63 mm | 2 cm |
| June | 29°C | 12°C | 20.7°C | 67 mm | 0 cm |
| July | 32°C | 15°C | 23.5°C | 78 mm | 0 cm |
| August | 30°C | 14°C | 22.4°C | 69 mm | 0 cm |
| September | 26°C | 10°C | 17.9°C | 31 mm | 1 cm |
| October | 19°C | 2°C | 10.5°C | 23 mm | 3 cm |
| November | 12°C | −4°C | 4.2°C | 7 mm | 6 cm |
| December | 7°C | −8°C | −0.9°C | 9 mm | 10 cm |
Source: NOAA NCEI 1991-2020 monthly normals, station USC00052932; 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 Flagler?
Normal highs sit between 65°F and 85°F in May, June, September and October. Of those, September has the fewest days with rain (3).
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 USC00052932.
When is the last frost in Flagler?
In Flagler, the last spring frost (32°F) comes after May 5 in half of years and after May 20 in one year in ten; the first autumn frost comes before October 8 in half of years and before September 27 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 51 year in 10 after May 20; 9 in 10 after April 22
- First autumn frost, half of years before
- October 81 year in 10 before September 27; 9 in 10 before October 18
NOAA puts the median frost-free season at 155 days, and the season without a hard freeze (28°F) at 172 days.
A hard freeze (28°F) comes after April 26 in half of springs and before October 16 in half of autumns.
The USDA's 2023 Plant Hardiness Zone Map puts Flagler in zone 5b in ZIP code 80815, 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 USC00052932; 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 in Flagler?
In a normal year in Flagler, 43 days a year reach 90°F (3 of them 100°F or more), 167 nights fall to 32°F or colder and 45 days bring measurable precipitation.
- Days at 90°F or more
- 43a normal year
- Days at 100°F or more
- 3a normal year
- Nights at 32°F or colder
- 167a normal year
- Days that stay below freezing
- 22high of 32°F or less
- Days with 0.01 inch of precipitation
- 45a normal year
- Days with 1 inch of snow or more
- 8a normal year
The highest temperature in this station's record (since 1919) is 107°F, on June 26, 2012; the lowest is −29°F, on January 18, 1984.
The wettest calendar year on that record is 1927, with 21.58 in; the snowiest season is 1983–84, with 89.5 inches.
Source: NOAA NCEI 1991-2020 annual normals, station USC00052932; records: ACIS (NOAA Regional Climate Centers), station USC00052932. Records use complete months only; a month missing more than three days is left out.
How sunny is Flagler?
Over a year 82% of the sunlight that would reach the ground under clear skies gets through the clouds in the area around Flagler, 4.9 kWh per square metre a day. August is the sunniest month (88%) and February the cloudiest (75%).
| Month | Share of clear-sky sunshine | Sunshine, kWh/m² a day |
|---|---|---|
| January | 79% | 2.6 |
| February | 75% | 3.4 |
| March | 78% | 4.7 |
| April | 77% | 5.8 |
| May | 79% | 6.7 |
| June | 85% | 7.4 |
| July | 87% | 7.3 |
| August | 88% | 6.5 |
| September | 87% | 5.4 |
| October | 82% | 4.0 |
| November | 81% | 2.8 |
| December | 76% | 2.2 |
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 Flagler need?
A normal year in Flagler brings 5,817 heating degree days, 8% more than the median U.S. place (5,373), and 828 cooling degree days, 9% 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 3,051 growing degree days a year above 50°F.
| Month | Heating | Cooling |
|---|---|---|
| January | 1,053 | 0 |
| February | 896 | 0 |
| March | 719 | 0 |
| April | 479 | 2 |
| May | 231 | 35 |
| June | 36 | 165 |
| July | 6 | 294 |
| August | 11 | 240 |
| September | 112 | 88 |
| October | 441 | 4 |
| November | 762 | 0 |
| December | 1,072 | 0 |
| Year (annual) | 5,817 | 828 |
Source: NOAA NCEI 1991-2020 monthly normals, station USC00052932. 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 Flagler's climate compare?
Flagler is warmer than 93 of the other 124 places with their own NOAA record in Colorado, and wetter than 76. Across the 7,247 U.S. stations with normals, its annual mean of 51.2°F is warmer than 46%.
In the Köppen classification computed from these normals, Flagler 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 Flagler share this climate record?
Arriba 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.
- Arriba, CO199 people · 11 mi W
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 Flagler's climate
What is the coldest month in Flagler?
December, with a normal high of 44°F and a normal low of 17°F. The warmest is July (89°F by day, 60°F at night).
Does it snow in Flagler?
Yes: 25 inches in a normal year, falling on 10 days with 0.1 inch or more, the most in January (5.1 inches).
What is the rainiest month in Flagler?
July, with 3.06 in of precipitation in a normal year; the driest is November with 0.29 in.
What plant hardiness zone is Flagler in?
The USDA's 2023 map puts Flagler in zone 5b in ZIP code 80815, the nearest ZIP area.
How late can frost come in Flagler?
In half of years the last 32°F night comes after May 5; in one year in ten it comes after May 20. Waiting until May 20 leaves about a one-in-ten chance of a later frost.
Nearby and next
- Colorado climateThe statewide normals and every place in the state
- Seibert, CO11 miles from this station, 49.9°F a year
- Genoa, CO23 miles from this station, 49.9°F a year
- Shaw (4 mi ENE), CO24 miles from this station, 49.0°F a year
- Stratton, CO25 miles from this station, 51.4°F a year
- Compare two placesMonth by month, side by side
Download these normals (CSV) · JSON · How these figures are made