Arcata Eureka, CA Climate: Temperature & Rain by Month
Annual temperature and rainfall from NOAA NCEI's 1991–2020 normals →; comfort score computed by PlainClimate
30-year climate normals (1991-2020) from Arcata Eureka's primary NOAA station, ARCATA EUREKA AP.
The climate verdict for Arcata Eureka
Water is the standout signal in Arcata Eureka, California: 46.1 inches of precipitation in a normal year. Against that wet profile, NOAA records an annual average of 53°F. Its climate comfort score of 73/100 (good) lands mid-pack nationally, exceeding 66% of station-mapped location scores.
- 53°F
- average temperature, NOAA 1991-2020 normal
- 73/100
- comfort score, above 66% of station-mapped location scores
- 46.1"
- annual precipitation
- 267 days
- frost-free growing season
Arcata Eureka: NOAA 1991-2020 normals describe a typical year, not a forecast. Method: /methodology.
Normals record plate
Sheet USW00024283 · Arcata Eureka, CA 53°F mean · 46.1" precip
TEMP-COOL · RANK-MID · PHOTO-FINISH · PRCP-MID · SWING-NARROW · COMF-MID · LOAD-HEAT · STN-1 · BOOK-FULL
- TEMP-COOL 53°F
- RANK-MID #3,499
- PHOTO-FINISH ≈ Cloverdale
- PRCP-MID 46.1"
- SWING-NARROW 10°F
- COMF-MID 73/100
- LOAD-HEAT 4,576 HDD
- STN-1 USW00024283
- BOOK-FULL 6/6 fields
Nearest mean-temperature peer: Cloverdale, OR (+ 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 CA station list.
- Arcata Eureka (this station) 53°F
- Hot Eureka Wfo Wood…, CA 53°F
- Near Cloverdale, OR 53°F
- Cold Yachats, OR 52°F
- Near Klamath, CA 52°F
Climate Living Index · Arcata Eureka
Arcata Eureka: 79/100 · grade B
Arcata Eureka publishes 5 of 6 Living Index dimensions (NOAA annual/seasonal normals · NOAA daily multivariate normals · NOAA hourly normals); 1 missing weight rescale to 100.
PlainClimate-derived for Arcata Eureka, not an official NOAA rating. Rankings still use Comfort Score 73/100 (separate formula). Breakpoints and limits.
| Dimension | Station value | Score |
|---|---|---|
| Normal heat + freeze calendar | 0 calendar days | 100/100 · A |
| Summer moisture balance | 52.7°F mean dew point | 97/100 · A |
| Frost-free season | 267 days/year | 94/100 · A |
| Precipitation balance | 46.1 in · 11.1 from 35 in | 61/100 · C |
| Annual temperature balance | 52.5°F · 15.0° from 67.5°F | 51/100 · D |
Arcata Eureka · 2026-08-04 · NOAA NCEI Climate Normals · method · Comfort Score method.
Arcata Eureka is a temperate Köppen climate: Csb
Coldest-month mean 48.0°F and warmest-month mean 57.9°F place this station in temperate, dry-summer, warm summer climates (Csb). Class Csb is the Peel et al. (2007) label for this station's monthly mean temperature and precipitation normals: temperate, specifically temperate, dry-summer, warm summer.
- Köppen code
- Csb
- Group
- Temperate
- Warmest month
- 57.9°F
- Coldest month
- 48.0°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 Arcata Eureka sits across the climate record
Three NOAA fields for Arcata Eureka's primary station, temperature, precipitation, and seasonal swing, are ranked against every station-mapped normal that carries the same field.
- Annual temperature
- 51st percentile warmth
- Mid-pack annual mean versus 6,861 station normals.
- Annual precipitation
- Top 29% wettest
- Arcata Eureka's annual total ranks in the wetter third of 6,352 measured normals.
- Seasonal temperature swing
- Narrower than 99%
- Warmest-to-coldest month gap for Arcata Eureka is compact versus 6,861 complete station-years.
How Arcata Eureka compares across U.S. station-mapped locations
Arcata Eureka's comfort score vs. all station-mapped locations
PlainClimate composite comfort index (1–100), NOAA 1991–2020 normals
73 Top 34% score exceeds 66% 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%). Below this entry.
- 70–80: 650 station-mapped locations (11%). This entry sits in this band.
- 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 | Freeze Days | 90°F+ Days |
|---|---|---|---|---|---|---|
| January | 56°F (14°C) | 41°F (5°C) | 48°F (9°C) | 7.5" | 4.3 | 0.0 |
| February | 57°F (14°C) | 41°F (5°C) | 49°F (9°C) | 6.5" | 3.8 | 0.0 |
| March | 57°F (14°C) | 41°F (5°C) | 49°F (9°C) | 6.3" | 2.1 | 0.0 |
| April | 58°F (14°C) | 43°F (6°C) | 50°F (10°C) | 4.1" | 0.8 | 0.0 |
| May | 60°F (15°C) | 46°F (8°C) | 53°F (12°C) | 2.1" | 0.1 | 0.0 |
| June | 63°F (17°C) | 49°F (9°C) | 56°F (13°C) | 1.0" | 0.0 | 0.0 |
| July | 63°F (17°C) | 51°F (11°C) | 57°F (14°C) | 0.2" | 0.0 | 0.0 |
| August | 65°F (18°C) | 51°F (11°C) | 58°F (14°C) | 0.3" | 0.0 | 0.0 |
| September | 65°F (18°C) | 49°F (9°C) | 57°F (14°C) | 0.8" | 0.0 | 0.1 |
| October | 64°F (18°C) | 45°F (7°C) | 54°F (12°C) | 2.7" | 0.1 | 0.0 |
| November | 59°F (15°C) | 42°F (6°C) | 51°F (10°C) | 5.7" | 2.3 | 0.0 |
| December | 56°F (13°C) | 40°F (4°C) | 48°F (9°C) | 8.9" | 5.5 | 0.0 |
The year, day by day
The calendar barely moves in Arcata Eureka: no date carries a normal high of 90°F or a normal low at freezing. The year runs between 39°F near December 17 and 65°F near September 12.
No freezing date
Not one calendar date in the 1991–2020 record carries a normal low at or below 32°F. The coldest normal low of the year is 39°F around December 17.
Where the wet dates fall
The likeliest wet date is December 12, when 62% of years recorded at least a hundredth of an inch. The driest is July 6 at 15%. Summed across the calendar, that is about 153 wet dates a year.
The widest day
October 16 carries the biggest normal gap between afternoon and dawn, 19°F between the normal high and the normal low.
Look up any date
Any date's 1991–2020 normal for Arcata Eureka.
Where Arcata Eureka Stands Nationally
Among the steadiest day-night climates ranked: even the widest normal daily swing holds to roughly 19°F.
Arcata Eureka 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
18.4 days with precipitation
17.6 days with precipitation
17.7 days with precipitation
14.5 days with precipitation
10.7 days with precipitation
6.3 days with precipitation
4.7 days with precipitation
5.7 days with precipitation
9.0 days with precipitation
11.8 days with precipitation
17.2 days with precipitation
19.3 days with precipitation
Arcata Eureka's wet season runs through the cold months
December, January and February carry 50% of the year's precipitation here, while June through August contribute 3%. 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 an unusually narrow 9.9°F seasonal spread.
- Wettest month
- December, 8.9"
- Driest month
- July, 0.2"
- Wettest three months
- December, January, February (50% 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 Arcata Eureka's precipitation splits across the calendar
About 153 days a year record measurable precipitation here, carrying 46.1" between them, or roughly 0.30 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.
Frost Dates & Growing Season
First Fall Freeze
November 30
50% probability date
Last Spring Freeze
March 8
50% probability date
Growing Season
267 days
Heating & Cooling Degree Days
Annual totals indicate energy demand for heating and cooling
Heating Degree Days
4,576
Higher = more heating needed
Cooling Degree Days
5
Higher = more cooling needed
Warmest Month
August
Coldest Month
December
Humidity & Wind
Monthly averages from hourly observations
| Month | Humidity | Wind (mph) | Clear Sky % | Overcast % |
|---|---|---|---|---|
| January | 81% | 6.1 | 38% | 39% |
| February | 82% | 6.8 | 35% | 41% |
| March | 82% | 7.1 | 35% | 35% |
| April | 84% | 6.9 | 38% | 37% |
| May | 87% | 6.6 | 39% | 34% |
| June | 86% | 6.3 | 49% | 27% |
| July | 89% | 5.4 | 47% | 29% |
| August | 87% | 5.1 | 55% | 18% |
| September | 85% | 4.8 | 49% | 29% |
| October | 84% | 5.1 | 43% | 32% |
| November | 82% | 5.9 | 41% | 35% |
| December | 82% | 6.2 | 38% | 39% |
Nationwide similar cities
Other rankable U.S. places outside CA closest to Arcata Eureka 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 (53°F here).
- Cameron, MO 53°F · 0.0°F off
- Cheraw, CO 53°F · 0.0°F off
- Chillicothe, MO 53°F · 0.0°F off
- Cloverdale, OR 53°F · 0.0°F off
Closest by annual precipitation
Nearest out-of-state peers by annual precipitation (46.1" here), excluding temperature-peer places.
- Keene, NH 46.1" · 0.0" off
- Grayson, KY 46.1" · 0.0" off
- Moundsville, WV 46.1" · 0.0" off
- Siloam, GA 46.1" · 0.0" off
Data-derived climate profile
How Arcata Eureka's climate pattern fits together
heating led · wet · low swing
Heating is the larger measured load in Arcata Eureka, at 4,576 degree days versus 5 for cooling. Unlike a strongly continental record, however, its 9.9°F month-to-month range is compact; persistent cool-season demand matters more than a dramatic summer-to-winter reversal.
The frost-free window extends for about 267 days. That is a long calendar measure, but it is not a forecast and does not combine heat, rainfall, soil, or local elevation into a planting recommendation.
Arcata Eureka's 9.9°F seasonal spread is compact even though precipitation is abundant. August and December mark the typical warm and cold ends of the calendar. The annual average is 53°F. Temperature is relatively steady; the monthly rows show how rain and snow observations vary across the calendar.
Alongside its heating load, Arcata Eureka carries 46.1 inches of precipitation in a normal year, inside PlainClimate's wet range. Snowfall is not added to the interpretation because its annual value is missing. That distinction matters because a wet annual total can arrive as rain, snow, or a mixture at different times.
These labels group NOAA 1991-2020 normals from Arcata Eureka'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 Arcata Eureka, not an official NOAA class or a year-ahead forecast.
Questions about Arcata Eureka's climate
How much rain does Arcata Eureka get? ▼
How much energy does heating and cooling require in Arcata Eureka? ▼
Data Sources
Data source: NOAA U.S. Climate Normals v1.0.1 (1991-2020). All figures on this page are from Arcata Eureka's primary station: ARCATA EUREKA AP (USW00024283). 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 Arcata Eureka; 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 Arcata Eureka 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.