Strontia Springs Dam, Colorado climate: Climate normals at a NOAA weather station
Strontia Springs Dam's normal year runs from 14°F December nights to 84°F July afternoons, with 20.4 inches of precipitation and 86 inches of snow a year. (NOAA 1991-2020 normals)
In metric: a yearly mean of 8.4°C, December lows of −10°C, July highs of 29°C, 517 mm of precipitation a year.
- NOAA stationStrontia Springs Dam
- Station IDUSC00058022
- Location39.43°N 105.12°W
- Elevation5,840 ft (1,780 m)
On October 23, the normal high in Strontia Springs Dam is 61°F and the normal low 29°F, and the chance of measurable rain or snow is 17%.
Normals describe a typical year at the station, not a forecast. The National Weather Service forecast for Strontia Springs Dam.
- Jan 43° 14°
- Feb 46° 15°
- Mar 54° 22°
- Apr 59° 29°
- May 68° 38°
- Jun 79° 47°
- Jul 84° 54°
- Aug 83° 52°
- Sep 76° 43°
- Oct 64° 31°
- Nov 51° 23°
- Dec 42° 14°
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 Strontia Springs Dam each month?
July is the warmest month, with normal highs of 84°F; December the coldest, with normal lows of 14°F. The most precipitation falls in April (2.92 in), the least in January (0.82 in).
| Month | High | Low | Mean | Precip. | Snow | Wet days | 90°F days | Freezing nights | Daylight |
|---|---|---|---|---|---|---|---|---|---|
| January | 43°F | 14°F | 28.4°F | 0.82 | 12.3 | 4 | <1 | 31 | 9 h 40 min |
| February | 46°F | 15°F | 30.4°F | 0.90 | 13.2 | 4 | <1 | 28 | 10 h 40 min |
| March | 54°F | 22°F | 38.0°F | 2.00 | 16.0 | 6 | <1 | 30 | 11 h 50 min |
| April | 59°F | 29°F | 44.0°F | 2.92 | 13.9 | 8 | <1 | 24 | 13 h 10 min |
| May | 68°F | 38°F | 53.1°F | 2.56 | 1.6 | 9 | <1 | 10 | 14 h 20 min |
| June | 79°F | 47°F | 62.7°F | 1.89 | 0.0 | 8 | 3 | 2 | 15 h |
| July | 84°F | 54°F | 69.1°F | 2.03 | 0.0 | 9 | 10 | <1 | 14 h 40 min |
| August | 83°F | 52°F | 67.5°F | 2.22 | 0.0 | 10 | 5 | <1 | 13 h 50 min |
| September | 76°F | 43°F | 59.4°F | 1.57 | 0.5 | 7 | 1 | 4 | 12 h 30 min |
| October | 64°F | 31°F | 47.4°F | 1.44 | 4.6 | 5 | <1 | 19 | 11 h 10 min |
| November | 51°F | 23°F | 36.9°F | 1.10 | 9.2 | 5 | <1 | 28 | 10 h |
| December | 42°F | 14°F | 27.9°F | 0.90 | 14.4 | 4 | <1 | 31 | 9 h 20 min |
| Year (annual) | 62°F | 32°F | 47.1°F | 20.35 | 85.7 | 80 | 19 | 207 |
The same normals in °C and millimetres
| Month | High | Low | Mean | Precip. | Snow |
|---|---|---|---|---|---|
| January | 6°C | −10°C | −2.0°C | 21 mm | 31 cm |
| February | 8°C | −9°C | −0.9°C | 23 mm | 34 cm |
| March | 12°C | −5°C | 3.3°C | 51 mm | 41 cm |
| April | 15°C | −2°C | 6.7°C | 74 mm | 35 cm |
| May | 20°C | 4°C | 11.7°C | 65 mm | 4 cm |
| June | 26°C | 8°C | 17.1°C | 48 mm | 0 cm |
| July | 29°C | 12°C | 20.6°C | 52 mm | 0 cm |
| August | 28°C | 11°C | 19.7°C | 56 mm | 0 cm |
| September | 24°C | 6°C | 15.2°C | 40 mm | 1 cm |
| October | 18°C | 0°C | 8.6°C | 37 mm | 12 cm |
| November | 11°C | −5°C | 2.7°C | 28 mm | 23 cm |
| December | 6°C | −10°C | −2.3°C | 23 mm | 37 cm |
Source: NOAA NCEI 1991-2020 monthly normals, station USC00058022; 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 Strontia Springs Dam?
Normal highs sit between 65°F and 85°F in May, June, July, August and September. Of those, September has the fewest days with rain (7).
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 USC00058022.
When is the last frost at Strontia Springs Dam?
In Strontia Springs Dam, the last spring frost (32°F) comes after May 16 in half of years and after June 6 in one year in ten; the first autumn frost comes before September 29 in half of years and before September 16 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 6; 9 in 10 after May 3
- First autumn frost, half of years before
- September 291 year in 10 before September 16; 9 in 10 before October 11
NOAA puts the median frost-free season at 132 days, and the season without a hard freeze (28°F) at 156 days.
A hard freeze (28°F) comes after May 3 in half of springs and before October 8 in half of autumns.
The USDA's 2023 Plant Hardiness Zone Map puts Strontia Springs Dam 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 −13°F (29 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 USC00058022; 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 Strontia Springs Dam?
In a normal year in Strontia Springs Dam, 19 days a year reach 90°F, 207 nights fall to 32°F or colder and 80 days bring measurable precipitation.
- Days at 90°F or more
- 19a normal year
- Days at 100°F or more
- fewer than 1a normal year
- Nights at 32°F or colder
- 207a normal year
- Days that stay below freezing
- 21high of 32°F or less
- Days with 0.01 inch of precipitation
- 80a normal year
- Days with 1 inch of snow or more
- 24a normal year
The highest temperature in this station's record (since 1984) is 100°F, on June 27, 1994; the lowest is −30°F, on December 24, 1998.
The wettest calendar year on that record is 2015, with 29.41 in; the snowiest season is 1997–98, with 134.0 inches.
Source: NOAA NCEI 1991-2020 annual normals, station USC00058022; records: ACIS (NOAA Regional Climate Centers), station USC00058022. Records use complete months only; a month missing more than three days is left out.
How sunny is it at Strontia Springs Dam?
Over a year 77% of the sunlight that would reach the ground under clear skies gets through the clouds at Strontia Springs Dam, 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 Strontia Springs Dam record?
A normal year at Strontia Springs Dam brings 6,852 heating degree days, 28% more than the median U.S. place (5,373), and 337 cooling degree days, 63% 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 2,108 growing degree days a year above 50°F.
| Month | Heating | Cooling |
|---|---|---|
| January | 1,135 | 0 |
| February | 969 | 0 |
| March | 837 | 0 |
| April | 632 | 0 |
| May | 375 | 4 |
| June | 116 | 47 |
| July | 21 | 148 |
| August | 36 | 112 |
| September | 191 | 25 |
| October | 546 | 0 |
| November | 843 | 0 |
| December | 1,151 | 0 |
| Year (annual) | 6,852 | 337 |
Source: NOAA NCEI 1991-2020 monthly normals, station USC00058022. 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 Strontia Springs Dam been warmer than normal?
2025 averaged 49.1°F, 2.0°F above the 1991-2020 normal of 47.1°F. 4 of the 5 complete years since 2021 ran warmer than the normal.
| Year | Mean | Against normal | Precip. | Snow |
|---|---|---|---|---|
| 2021 | 47.9°F | +0.8°F | 18.81 | 83.5 |
| 2022 | 47.2°F | +0.1°F | 17.09 | 118.5 |
| 2023 | 47.1°F | at normal | 27.11 | 62.2 |
| 2024 | 49.3°F | +2.2°F | 21.28 | 84.2 |
| 2025 | 49.1°F | +2.0°F | 17.25 | 63.7 |
Over 32 complete years from 1985 to 2025, the station's annual mean temperature rose at a fitted 2.2°F per century (+0.12°C per decade). A fitted rate summarizes the whole record; single years swing well above and below it.
Source: observed years: ACIS, station USC00058022; trend: NOAA GHCN-Monthly v4. A year counts only with all twelve months complete.
How does Strontia Springs Dam's climate compare?
Strontia Springs Dam is warmer than 52 of the 125 places with their own NOAA record in Colorado, and wetter than 109. Across the 7,247 U.S. stations with normals, its annual mean of 47.1°F is warmer than 28%.
In the Köppen classification computed from these normals, Strontia Springs Dam 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.
Questions about Strontia Springs Dam's climate
What is the coldest month at Strontia Springs Dam?
December, with a normal high of 42°F and a normal low of 14°F. The warmest is July (84°F by day, 54°F at night).
Does it snow at Strontia Springs Dam?
Yes: 86 inches in a normal year, falling on 25 days with 0.1 inch or more, the most in March (16.0 inches).
What is the rainiest month at Strontia Springs Dam?
April, with 2.92 in of precipitation in a normal year; the driest is January with 0.82 in.
What plant hardiness zone is Strontia Springs Dam in?
The USDA's 2023 map puts Strontia Springs Dam 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 −13°F (29 years, 1991-2020): zone 5b.
How late can frost come at Strontia Springs Dam?
In half of years the last 32°F night comes after May 16; in one year in ten it comes after June 6. Waiting until June 6 leaves about a one-in-ten chance of a later frost.
Nearby and next
- Colorado climateThe statewide normals and every place in the state
- Roxborough State Park, CO2 miles from this station, 49.6°F a year
- Kassler, CO4 miles from this station, 50.2°F a year
- Castle Rock, CO12 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