Delta, CO Climate: Temperature by Month
Temperature and precipitation from NOAA NCEI 1991–2020 normals →, plus PlainClimate's derived comfort score
30-year climate normals (1991-2020) from Delta's primary NOAA station, DELTA 3E.
The climate verdict for Delta
Delta, Colorado has a mixed annual climate rather than one dominant extreme. Its NOAA normal shows an annual average of 51°F. July is the warmest month at 75°F and January the coldest at 27°F.
- 51°F
- yearly average temperature, NOAA normal
- 159 days
- frost-free growing season
Delta: NOAA 1991-2020 normals describe a typical year, not a forecast. Method: /methodology.
Normals record plate
Sheet USC00052196 · Delta, CO 51°F mean
TEMP-COOL · RANK-MID · PHOTO-FINISH · PRCP-UNK · SWING-WIDE · COMF-UNK · LOAD-HEAT · STN-1 · BOOK-PART
- TEMP-COOL 51°F
- RANK-MID #3,156
- PHOTO-FINISH ≈ Danbury
- PRCP-UNK Rain n/a
- SWING-WIDE 48°F
- COMF-UNK Comfort n/a
- LOAD-HEAT 5,802 HDD
- STN-1 USC00052196
- BOOK-PART 4/6 fields
Nearest mean-temperature peer: Danbury, CT (+ 0 °F mean)
Instrument codes from this station's NOAA 1991–2020 normals, mean temperature, corpus warmth rank, photo-finish peer station, precipitation band, seasonal swing, comfort composite, degree-day load, and field book, not a livability rating.
Mean-temperature neighbourhood
Nationwide NOAA normal poles and nearest peers, not a reprint of every CO station list.
- Delta (this station) 51°F
- Cold Jamaica Plain, MA 51°F
- Hot Danbury, CT 51°F
- Near Flagler, CO 51°F
- Near Eaton, OH 51°F
Climate Living Index · Delta
Delta: 27/100 · grade F
Delta publishes 3 of 6 Living Index dimensions (NOAA annual/seasonal normals · NOAA daily multivariate normals); 3 missing weights rescale to 100.
PlainClimate-derived for Delta, not an official NOAA rating. Breakpoints and limits.
| Dimension | Station value | Score |
|---|---|---|
| Annual temperature balance | 51.3°F · 16.2° from 67.5°F | 46/100 · D |
| Frost-free season | 159 days/year | 33/100 · F |
| Normal heat + freeze calendar | 221 calendar days | 5/100 · F |
Delta · 2026-08-04 · NOAA NCEI Climate Normals · method .
National standing · heating-led station
Where Delta sits across the climate record
Available NOAA 1991–2020 fields for Delta are ranked only against stations that publish the same field, missing metrics stay blank rather than estimated.
- Annual temperature
- 46th percentile warmth
- Mid-pack annual mean versus 6,861 station normals.
- Seasonal temperature swing
- Wider than 73%
- Warmest-to-coldest month gap for Delta is large versus 6,861 complete station-years.
Monthly Temperatures
Average daily high and low temperatures by month
| Month | Avg High | Avg Low | Mean | Precip | Freeze Days | 90°F+ Days |
|---|---|---|---|---|---|---|
| January | 40°F (4°C) | 15°F (-10°C) | 27°F (-3°C) | N/A | 30.5 | 0.0 |
| February | 48°F (9°C) | 21°F (-6°C) | 34°F (1°C) | N/A | 26.5 | 0.0 |
| March | 59°F (15°C) | 28°F (-2°C) | 43°F (6°C) | N/A | 23.4 | 0.0 |
| April | 67°F (19°C) | 35°F (2°C) | 51°F (11°C) | N/A | 9.6 | 0.0 |
| May | 76°F (25°C) | 44°F (6°C) | 60°F (16°C) | N/A | 1.2 | 2.0 |
| June | 88°F (31°C) | 52°F (11°C) | 70°F (21°C) | N/A | 0.0 | 16.7 |
| July | 93°F (34°C) | 58°F (14°C) | 75°F (24°C) | N/A | 0.0 | 25.8 |
| August | 90°F (32°C) | 56°F (13°C) | 73°F (23°C) | N/A | 0.0 | 18.4 |
| September | 82°F (28°C) | 47°F (8°C) | 64°F (18°C) | N/A | 0.5 | 4.8 |
| October | 68°F (20°C) | 34°F (1°C) | 51°F (11°C) | N/A | 12.2 | 0.1 |
| November | 53°F (12°C) | 24°F (-5°C) | 38°F (4°C) | N/A | 25.9 | 0.0 |
| December | 40°F (5°C) | 15°F (-9°C) | 28°F (-2°C) | N/A | 30.5 | 0.0 |
The year, day by day
Delta works both ends of the calendar. Normal highs climb to 93°F by July 11 and hold at or above 90°F on 56 dates, then normal lows drop to freezing or below on 165 dates, bottoming at 13°F around January 1.
When the heat sits
Normal highs reach 90°F from June 21 through August 15, covering 56 dates. The broader mild season, normal highs of 70°F or more, runs April 29 to October 12.
This counts calendar dates whose 1991–2020 normal high reaches 90°F. It is a smaller number than the 90°F+ day counts in the monthly table above, which measure how often the threshold was actually crossed in a typical year. A date can average 88°F and still exceed 90°F in half of all years.
The freezing stretch
The normal low stays at or below 32°F into April 3, then returns to freezing around October 22, covering 165 dates in all.
Derived from the normal daily minimum. This is a different measure from the 50%-probability frost dates shown elsewhere on this page, which come from NOAA’s frost product.
The widest day
June 19 carries the biggest normal gap between afternoon and dawn, 37°F between the normal high and the normal low.
Look up any date
Any date's 1991–2020 normal for Delta.
Where Delta Stands Nationally
Day-to-night contrast is extreme by national standards — the widest normal daily swing reaches about 37°F, sharper than nine in ten ranked stations see.
Delta earns one nationally notable standing (outer quintile) against 6,860 NOAA 1991–2020 normals stations, middle-of-the-pack metrics stay silent here.
Monthly Precipitation
Average monthly rainfall
Frost Dates & Growing Season
First Fall Freeze
October 7
50% probability date
Last Spring Freeze
May 1
50% probability date
Growing Season
159 days
Heating & Cooling Degree Days
Annual totals indicate energy demand for heating and cooling
Heating Degree Days
5,802
Higher = more heating needed
Cooling Degree Days
833
Higher = more cooling needed
Warmest Month
July
Coldest Month
January
Nationwide similar cities
Other rankable U.S. places outside CO closest to Delta on two NOAA annual-normal axes (mean temperature and annual precipitation). Chip rows use distinct link sets.
Closest by average temperature
Nearest out-of-state peers by annual mean temperature (51°F here).
- Aurora, NE 51°F · 0.0°F off
- Barnesville, OH 51°F · 0.0°F off
- Cashtown, PA 51°F · 0.0°F off
- Danbury, CT 51°F · 0.0°F off
Data-derived climate profile
How Delta's climate pattern fits together
heating led · mid swing
Delta's energy balance leans toward cold weather: 5,802 annual heating degree days against 833 for cooling. Its 48.0°F seasonal range still makes the monthly rows more useful than the annual average alone.
Delta's frost-free season lasts about 159 days, a middle-length window whose endpoints matter more than the annual average. It describes freeze probability, not year-specific planting conditions.
July and January mark the typical warm and cold ends of the calendar in Delta's middle-range seasonal profile. The measured spread is 48.0°F. The annual average is 51°F. Neither the annual mean nor one extreme month represents the full calendar on its own.
A moisture-range label is withheld because Delta's annual precipitation total is unavailable. Monthly source values remain visible where NOAA provides them, and no annual amount is reconstructed from incomplete data.
These labels group NOAA 1991-2020 normals from Delta's primary station, so the winter figures are a thirty-year average and not a floor: a single hard season can run well below them. Treat each band as a descriptive range for Delta, not an official NOAA class or a year-ahead forecast.
Questions about Delta's climate
How many days above 90°F does Delta get? ▼
How much energy does heating and cooling require in Delta? ▼
Data Sources
Data source: NOAA U.S. Climate Normals v1.0.1 (1991-2020). All figures on this page are from Delta's primary station: DELTA 3E (USC00052196). For informational purposes only.
Place identity: U.S. Census Bureau 2024 Gazetteer places. The 2024 Census Gazetteer identifies the exact name-and-state match as an incorporated place (GEOID 0819850). Match rule for Delta: exact normalized name + state only, no fuzzy expansion, so nearby differently spelled facilities stay unmatched.
On this page every temperature, precipitation, and derived score for Delta comes from its primary NOAA station record. No figure on this page is typed in by an editor - each value is rendered from NOAA 1991-2020 U.S. Climate Normals. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of 1991–2020 normals.