Copco #1 Dam, CA Climate: Temperature & Rain by Month
Average temperature and precipitation from NOAA NCEI 1991–2020 normals →, with a derived climate comfort score
30-year climate normals (1991-2020) from Copco #1 Dam's primary NOAA station, COPCO #1 DAM.
The climate verdict for Copco #1 Dam
Copco #1 Dam, California has a mixed annual climate rather than one dominant extreme. Its NOAA normal shows an annual average of 54°F. Its climate comfort score of 64/100 (good) lands mid-pack nationally, exceeding 49% of station-mapped location scores.
- 54°F
- annual average temperature (NOAA normal)
- 64/100
- comfort score, above 49% of station-mapped location scores
- 20.4"
- annual precipitation · 15" snow
- 170 days
- frost-free growing season
Copco #1 Dam: NOAA 1991-2020 normals describe a typical year, not a forecast. Method: /methodology.
Normals record plate
Sheet USC00041990 · Copco #1 Dam, CA 54°F mean · 20.4" precip
TEMP-COOL · RANK-MID · PHOTO-FINISH · PRCP-DRY · SWING-MID · COMF-MID · LOAD-HEAT · STN-1 · BOOK-FULL
- TEMP-COOL 54°F
- RANK-MID #3,842
- PHOTO-FINISH ≈ Anstead Hawks N…
- PRCP-DRY 20.4"
- SWING-MID 38°F
- COMF-MID 64/100
- LOAD-HEAT 4,895 HDD
- STN-1 USC00041990
- BOOK-FULL 6/6 fields
Nearest mean-temperature peer: Anstead Hawks Nest State Park, WV ( -0.1 °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 CA station list.
- Copco #1 Dam (this station) 54°F
- Cold Anstead Hawks N…, WV 54°F
- Hot Trinidad, CO 54°F
- Near Oceana, WV 54°F
- Near Hermiston, OR 54°F
Climate Living Index · Copco #1 Dam
Copco #1 Dam: 44/100 · grade D
Copco #1 Dam publishes 5 of 6 Living Index dimensions (NOAA annual/seasonal normals · NOAA daily multivariate normals); 1 missing weight rescale to 100.
PlainClimate-derived for Copco #1 Dam, not an official NOAA rating. Rankings still use Comfort Score 64/100 (separate formula). Breakpoints and limits.
| Dimension | Station value | Score |
|---|---|---|
| Snowfall burden | 14.5 inches/year | 57/100 · C |
| Annual temperature balance | 53.8°F · 13.7° from 67.5°F | 55/100 · C |
| Precipitation balance | 20.4 in · 14.6 from 35 in | 49/100 · D |
| Frost-free season | 170 days/year | 42/100 · D |
| Normal heat + freeze calendar | 178 calendar days | 26/100 · F |
Copco #1 Dam · 2026-08-04 · NOAA NCEI Climate Normals · method · Comfort Score method.
Copco #1 Dam is a temperate Köppen climate: Csa
Coldest-month mean 36.4°F and warmest-month mean 74.3°F place this station in temperate, dry-summer, hot summer climates (Csa). Class Csa is the Peel et al. (2007) label for this station's monthly mean temperature and precipitation normals: temperate, specifically temperate, dry-summer, hot summer.
- Köppen code
- Csa
- Group
- Temperate
- Warmest month
- 74.3°F
- Coldest month
- 36.4°F
Source: official public datasets monthly normals (1991–2020) at the city’s primary station. This is a station classification, not a mapped regional consensus.
National standing · heating-led station
Where Copco #1 Dam sits across the climate record
Three NOAA fields for Copco #1 Dam's primary station, temperature, precipitation, and seasonal swing, are ranked against every station-mapped normal that carries the same field.
- Annual temperature
- 56th percentile warmth
- Mid-pack annual mean versus 6,861 station normals.
- Annual precipitation
- Drier than 72%
- Copco #1 Dam's annual total ranks in the drier third of 6,352 measured normals.
- Seasonal temperature swing
- Narrower than 73%
- Warmest-to-coldest month gap for Copco #1 Dam is compact versus 6,861 complete station-years.
How Copco #1 Dam compares across U.S. station-mapped locations
Copco #1 Dam's comfort score vs. all station-mapped locations
PlainClimate composite comfort index (1–100), NOAA 1991–2020 normals
64 49th percentile score exceeds 49% of 6,189 station-mapped location scores
- 0–10: 0 station-mapped locations (0%). Below this entry.
- 10–20: 0 station-mapped locations (0%). Below this entry.
- 20–30: 96 station-mapped locations (2%). Below this entry.
- 30–40: 280 station-mapped locations (5%). Below this entry.
- 40–50: 1,113 station-mapped locations (18%). Below this entry.
- 50–60: 1,329 station-mapped locations (21%). Below this entry.
- 60–70: 1,236 station-mapped locations (20%). This entry sits in this band.
- 70–80: 650 station-mapped locations (11%). Above this entry.
- 80–90: 921 station-mapped locations (15%). Above this entry.
- 90–100: 564 station-mapped locations (9%). Above this entry.
Source NOAA U.S. Climate Normals, PlainClimate comfort index · 1991–2020
Monthly Temperatures
Average daily high and low temperatures by month
| Month | Avg High | Avg Low | Mean | Precip | Snow | Freeze Days | 90°F+ Days |
|---|---|---|---|---|---|---|---|
| January | 48°F (9°C) | 27°F (-3°C) | 37°F (3°C) | 3.4" | 4.7" | 26.4 | 0.0 |
| February | 53°F (12°C) | 29°F (-2°C) | 41°F (5°C) | 2.3" | 2.7" | 21.1 | 0.0 |
| March | 58°F (15°C) | 32°F (0°C) | 45°F (7°C) | 2.0" | 0.6" | 14.8 | 0.0 |
| April | 64°F (18°C) | 35°F (2°C) | 50°F (10°C) | 1.7" | 0.6" | 8.8 | 0.0 |
| May | 74°F (23°C) | 42°F (5°C) | 58°F (14°C) | 1.4" | 0.0" | 2.5 | 1.1 |
| June | 82°F (28°C) | 49°F (9°C) | 65°F (19°C) | 0.9" | 0.0" | 0.6 | 9.8 |
| July | 93°F (34°C) | 56°F (13°C) | 74°F (24°C) | 0.5" | 0.0" | 0.0 | 22.7 |
| August | 93°F (34°C) | 55°F (13°C) | 74°F (23°C) | 0.3" | 0.0" | 0.0 | 25.7 |
| September | 85°F (30°C) | 49°F (9°C) | 67°F (19°C) | 0.5" | 0.0" | 0.0 | 13.1 |
| October | 70°F (21°C) | 39°F (4°C) | 54°F (12°C) | 1.4" | 0.0" | 4.4 | 1.1 |
| November | 56°F (13°C) | 32°F (0°C) | 44°F (7°C) | 2.7" | 1.5" | 15.3 | 0.0 |
| December | 47°F (8°C) | 26°F (-3°C) | 36°F (2°C) | 3.5" | 4.4" | 24.9 | 0.0 |
The year, day by day
Copco #1 Dam works both ends of the calendar. Normal highs climb to 95°F by July 24 and hold at or above 90°F on 60 dates, then normal lows drop to freezing or below on 118 dates, bottoming at 25°F around December 22.
When the heat sits
Normal highs reach 90°F from July 5 through September 2, covering 60 dates. The broader mild season, normal highs of 70°F or more, runs May 2 to October 15.
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 March 12, then returns to freezing around November 16, covering 118 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.
Where the wet dates fall
The likeliest wet date is January 7, when 43% of years recorded at least a hundredth of an inch. The driest is August 18 at 6%. Summed across the calendar, that is about 94 wet dates a year.
The widest day
August 24 carries the biggest normal gap between afternoon and dawn, 38°F between the normal high and the normal low.
Look up any date
Any date's 1991–2020 normal for Copco #1 Dam.
Where Copco #1 Dam Stands Nationally
Day-to-night contrast is extreme by national standards — the widest normal daily swing reaches about 38°F, sharper than nine in ten ranked stations see.
Copco #1 Dam 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 and snowfall
Snow: 4.7"
13.2 days with precipitation
Snow: 2.7"
10.3 days with precipitation
Snow: 0.6"
11.6 days with precipitation
Snow: 0.6"
10.5 days with precipitation
7.8 days with precipitation
3.9 days with precipitation
1.8 days with precipitation
1.7 days with precipitation
2.7 days with precipitation
5.9 days with precipitation
Snow: 1.5"
11.0 days with precipitation
Snow: 4.4"
13.2 days with precipitation
Copco #1 Dam's wet season runs through the cold months
December, January and February carry 45% of the year's precipitation here, while June through August contribute 8%. That is the cool-season-dominant pattern of the West Coast and the higher inland West, where storm tracks swing south in winter and summer turns dry; the thermometer meanwhile shows a 37.9°F seasonal spread.
- Wettest month
- December, 3.5"
- Driest month
- August, 0.3"
- Wettest three months
- December, January, November (47% of the year)
Shares are computed from this station's own 1991-2020 monthly precipitation normals. A cool-season label means the December-February share reaches 35%. Where snow falls, the monthly figures above report liquid-equivalent precipitation, so a wet winter month is not necessarily a rainy one.
How Copco #1 Dam's precipitation splits across the calendar
About 94 days a year record measurable precipitation here, carrying 20.4" between them, or roughly 0.22 inches on a typical wet day. That sits in the middle band: neither the many-light-days pattern of the Pacific Northwest and the Great Lakes, nor the few-heavy-events pattern of the Gulf and the desert Southwest.
A wet day is one recording at least 0.01 inches. These are 1991-2020 normals: they describe an average year and say nothing about the heaviest single storm on record.
Winter brings real snow to Copco #1 Dam
Copco #1 Dam averages 14.5 inches of snowfall a year, with January the snowiest month on the normals, spread across roughly 8 days that record measurable snow. That is depth accumulating on the ground, which is why it can exceed the annual precipitation figure: precipitation counts the liquid the snow melts down to, and fresh snow is mostly air.
- Annual snowfall: 14.5 inches of depth.
- Days recording measurable snow: about 8 a year.
- At a rough ten-to-one melt ratio, snow accounts for on the order of 7% of the year's precipitation.
NOAA 1991-2020 normals. The ten-to-one ratio is a convention, not a measurement: real ratios vary with temperature, so treat the share as an order of magnitude rather than an exact split.
Frost Dates & Growing Season
First Fall Freeze
October 21
50% probability date
Last Spring Freeze
May 4
50% probability date
Growing Season
170 days
Heating & Cooling Degree Days
Annual totals indicate energy demand for heating and cooling
Heating Degree Days
4,895
Higher = more heating needed
Cooling Degree Days
852
Higher = more cooling needed
Warmest Month
July
Coldest Month
December
Nationwide similar cities
Other rankable U.S. places outside CA closest to Copco #1 Dam 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 (54°F here).
- Ashland, KY 54°F · 0.0°F off
- Cheviot, OH 54°F · 0.0°F off
- Emporia, KS 54°F · 0.0°F off
- Eskridge, KS 54°F · 0.0°F off
Closest by annual precipitation
Nearest out-of-state peers by annual precipitation (20.4" here), excluding temperature-peer places.
- Pullman, WA 20.4" · 0.0" off
- Sterling City, TX 20.4" · 0.0" off
- Zapata, TX 20.4" · 0.0" off
- Colby, KS 20.4" · 0.0" off
Snow and freeze rhythm
When cold and snow define Copco #1 Dam
heating led · moderate · mid swing
Copco #1 Dam's energy balance leans toward cold weather: 4,895 annual heating degree days against 852 for cooling. Its 37.9°F seasonal range still makes the monthly rows more useful than the annual average alone.
Copco #1 Dam's frost-free season lasts about 170 days, a middle-length window whose endpoints matter more than the annual average. It describes freeze probability, not year-specific planting conditions.
-
1. Copco #1 Dam coldest normal
December
The monthly mean of 36°F (2°C) sits near freezing, so cold nights and above-freezing afternoons share the same month.
-
2. Copco #1 Dam typical freeze period
January through December
The station reports average freezing days from January through December.
-
3. Copco #1 Dam snow peak
January
Copco #1 Dam averages 14.5 inches of snow a year, with January the snowiest month on the normals.
Questions about Copco #1 Dam's climate
How much snow does Copco #1 Dam get? ▼
How many days above 90°F does Copco #1 Dam get? ▼
How much energy does heating and cooling require in Copco #1 Dam? ▼
Data Sources
Data source: NOAA U.S. Climate Normals v1.0.1 (1991-2020). All figures on this page are from Copco #1 Dam's primary station: COPCO #1 DAM (USC00041990). For informational purposes only.
Place identity: U.S. Census Bureau 2024 Gazetteer places. The conservative exact name-and-state crosswalk finds no Census place match, so PlainClimate treats this as a station-mapped location and does not claim it is a municipality. No exact Gazetteer row for Copco #1 Dam; facility counts that depend on place identity are therefore an upper bound, not a municipal census.
On this page every temperature, precipitation, and derived score for Copco #1 Dam 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.