Delta, Colorado climate: Normal weather by month, frost dates and records
Delta's normal year runs from 15°F January nights to 93°F July afternoons. (NOAA 1991-2020 normals)
In metric: a yearly mean of 10.7°C, January lows of −10°C, July highs of 34°C.
- NOAA stationDelta (3 mi E)
- Station IDUSC00052196
- Location38.75°N 108.03°W
- Elevation5,027 ft (1,532 m)
- Population9,688
On October 23, the normal high in Delta is 65°F and the normal low 31°F.
Normals describe a typical year at the station, not a forecast. The National Weather Service forecast for Delta.
- Jan 40° 15°
- Feb 48° 21°
- Mar 59° 28°
- Apr 67° 35°
- May 76° 44°
- Jun 88° 52°
- Jul 93° 58°
- Aug 90° 56°
- Sep 82° 47°
- Oct 68° 34°
- Nov 53° 24°
- Dec 40° 15°
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 Delta each month?
July is the warmest month, with normal highs of 93°F; January the coldest, with normal lows of 15°F.
| Month | High | Low | Mean | Wet days | 90°F days | Freezing nights | Daylight |
|---|---|---|---|---|---|---|---|
| January | 40°F | 15°F | 27.3°F | – | <1 | 31 | 9 h 40 min |
| February | 48°F | 21°F | 34.4°F | – | <1 | 27 | 10 h 40 min |
| March | 59°F | 28°F | 43.3°F | – | <1 | 23 | 11 h 50 min |
| April | 67°F | 35°F | 50.9°F | – | <1 | 10 | 13 h 10 min |
| May | 76°F | 44°F | 60.0°F | – | 2 | 1 | 14 h 20 min |
| June | 88°F | 52°F | 69.8°F | – | 17 | <1 | 14 h 50 min |
| July | 93°F | 58°F | 75.3°F | – | 26 | <1 | 14 h 40 min |
| August | 90°F | 56°F | 72.7°F | – | 18 | <1 | 13 h 40 min |
| September | 82°F | 47°F | 64.3°F | – | 5 | 1 | 12 h 30 min |
| October | 68°F | 34°F | 51.3°F | – | <1 | 12 | 11 h 20 min |
| November | 53°F | 24°F | 38.4°F | – | <1 | 26 | 10 h 10 min |
| December | 40°F | 15°F | 27.9°F | – | <1 | 31 | 9 h 30 min |
| Year (annual) | 67°F | 36°F | 51.3°F | – | 68 | 160 |
The same normals in °C and millimetres
| Month | High | Low | Mean |
|---|---|---|---|
| January | 4°C | −10°C | −2.6°C |
| February | 9°C | −6°C | 1.3°C |
| March | 15°C | −2°C | 6.3°C |
| April | 19°C | 2°C | 10.5°C |
| May | 25°C | 6°C | 15.6°C |
| June | 31°C | 11°C | 21.0°C |
| July | 34°C | 14°C | 24.1°C |
| August | 32°C | 13°C | 22.6°C |
| September | 28°C | 8°C | 17.9°C |
| October | 20°C | 1°C | 10.7°C |
| November | 12°C | −5°C | 3.6°C |
| December | 5°C | −9°C | −2.3°C |
NOAA publishes no 1991-2020 snowfall normal for this station. The nearest record that keeps one, Cedaredge (13 miles away), gets 40 inches of snow in a normal year; elevation and distance can change that.
Source: NOAA NCEI 1991-2020 monthly normals, station USC00052196; 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 Delta?
Normal highs sit between 65°F and 85°F in April, May, September and October.
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 USC00052196.
When is the last frost in Delta?
In Delta, the last spring frost (32°F) comes after May 1 in half of years and after May 14 in one year in ten; the first autumn frost comes before October 7 in half of years and before September 26 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 11 year in 10 after May 14; 9 in 10 after April 19
- First autumn frost, half of years before
- October 71 year in 10 before September 26; 9 in 10 before October 19
NOAA puts the median frost-free season at 159 days, and the season without a hard freeze (28°F) at 180 days.
A hard freeze (28°F) comes after April 19 in half of springs and before October 16 in half of autumns.
The USDA's 2023 Plant Hardiness Zone Map puts Delta in zone 6b in ZIP code 81410, 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 USC00052196; 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 Delta?
In a normal year in Delta, 68 days a year reach 90°F (5 of them 100°F or more) and 160 nights fall to 32°F or colder.
- Days at 90°F or more
- 68a normal year
- Days at 100°F or more
- 5a normal year
- Nights at 32°F or colder
- 160a normal year
- Days that stay below freezing
- 14high of 32°F or less
Source: NOAA NCEI 1991-2020 annual normals, station USC00052196.
How sunny is Delta?
Over a year 81% of the sunlight that would reach the ground under clear skies gets through the clouds in the area around Delta, 5.1 kWh per square metre a day. June is the sunniest month (88%) and December the cloudiest (75%).
| Month | Share of clear-sky sunshine | Sunshine, kWh/m² a day |
|---|---|---|
| January | 78% | 2.7 |
| February | 76% | 3.6 |
| March | 78% | 4.9 |
| April | 79% | 6.1 |
| May | 81% | 7.1 |
| June | 88% | 8.0 |
| July | 82% | 7.1 |
| August | 81% | 6.3 |
| September | 85% | 5.5 |
| October | 83% | 4.2 |
| November | 81% | 3.0 |
| December | 75% | 2.3 |
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 Delta need?
A normal year in Delta brings 5,802 heating degree days, 8% more than the median U.S. place (5,373), and 833 cooling degree days, 8% 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 3,082 growing degree days a year above 50°F.
| Month | Heating | Cooling |
|---|---|---|
| January | 1,170 | 0 |
| February | 855 | 0 |
| March | 673 | 0 |
| April | 424 | 1 |
| May | 186 | 31 |
| June | 32 | 174 |
| July | 0 | 321 |
| August | 2 | 239 |
| September | 85 | 64 |
| October | 428 | 2 |
| November | 797 | 0 |
| December | 1,150 | 0 |
| Year (annual) | 5,802 | 833 |
Source: NOAA NCEI 1991-2020 monthly normals, station USC00052196. 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 Delta's climate compare?
Delta is warmer than 97 of the other 124 places with their own NOAA record in Colorado. Across the 7,247 U.S. stations with normals, its annual mean of 51.3°F is warmer than 46%.
Source: NOAA NCEI 1991-2020 normals for every station PlainClimate covers.
Which places near Delta share this climate record?
Orchard City 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.
- Orchard City, CO3,276 people · 6 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 Delta's climate
What is the coldest month in Delta?
January, with a normal high of 40°F and a normal low of 15°F. The warmest is July (93°F by day, 58°F at night).
Does it snow in Delta?
Yes. NOAA publishes no 1991-2020 snowfall normal for Delta's NOAA station; the nearest record that keeps one, Cedaredge (13 miles away), records 40 inches of snow in a normal year.
What plant hardiness zone is Delta in?
The USDA's 2023 map puts Delta in zone 6b in ZIP code 81410, the nearest ZIP area.
How late can frost come in Delta?
In half of years the last 32°F night comes after May 1; in one year in ten it comes after May 14. Waiting until May 14 leaves about a one-in-ten chance of a later frost.
Nearby and next
- Colorado climateThe statewide normals and every place in the state
- Cedaredge, CO12 miles from this station, 48.8°F a year
- Montrose, CO19 miles from this station, 50.3°F a year
- Paonia, CO23 miles from this station, 50.6°F a year
- Black Canyon Of The Gunnison, CO23 miles from this station, 45.2°F a year
- Compare two placesMonth by month, side by side
Download these normals (CSV) · JSON · How these figures are made