Monthly climate in Rio Dell, California, United States

Last updated: March 2, 2024

Under the Köppen–Geiger climate classification Rio Dell features a warm-summer Mediterranean climate (Csb). Temperatures typically range between 6 °C (44 °F) and 18 °C (64 °F) through the year, but rarely can drop to -4 °C (25 °F) or can rise to as high as 36 °C (98 °F). The average annual precipitation amounts to about 1143 mm (45.0 inches) and receives 90 rainy days on the 1 mm (0.04 inches) threshold annually. Rio Dell enjoys an average of 3254 hours of sunshine throughout the year, and daylight varies from 9 hours 19 minutes to 15 hours 0 minutes per day.

Monthly average temperatures in Rio Dell, California, United States §

The warmest months in Rio Dell are July, August and September, with daily mean temperatures ranging from 16 to 18 °C (61 - 64 °F) throughout the day. The coldest temperatures usually occur in January, February and December, when daily mean temperatures range from 6 to 7 °C (44 - 45 °F) throughout the day. On average each year, Rio Dell experiences 23 days above 25 °C (77.0 °F) and 14 days below 0 °C (32.0 °F).

Monthly average temperatures with daily means, minimums and maximums for period, average high and low temperatures in Rio Dell, California, United States. Generated using Copernicus Climate Change Service information. Data for period from January 2017 to June 2022.
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Maximum 20°C
(69°F)
23°C
(73°F)
21°C
(70°F)
25°C
(76°F)
27°C
(81°F)
31°C
(89°F)
29°C
(84°F)
33°C
(91°F)
36°C
(98°F)
30°C
(86°F)
22°C
(72°F)
20°C
(68°F)
Mean maximum 17°C
(62°F)
18°C
(65°F)
20°C
(68°F)
23°C
(73°F)
23°C
(74°F)
27°C
(80°F)
28°C
(83°F)
30°C
(87°F)
32°C
(89°F)
27°C
(81°F)
21°C
(69°F)
17°C
(63°F)
Average high 11°C
(52°F)
11°C
(52°F)
12°C
(54°F)
14°C
(58°F)
16°C
(62°F)
20°C
(68°F)
23°C
(73°F)
24°C
(75°F)
23°C
(73°F)
19°C
(67°F)
14°C
(58°F)
11°C
(51°F)
Daily mean 7°C
(45°F)
7°C
(44°F)
8°C
(46°F)
10°C
(49°F)
12°C
(53°F)
15°C
(59°F)
17°C
(62°F)
18°C
(64°F)
16°C
(61°F)
13°C
(55°F)
9°C
(49°F)
6°C
(44°F)
Average low 4°C
(39°F)
3°C
(37°F)
4°C
(39°F)
5°C
(42°F)
7°C
(46°F)
10°C
(50°F)
12°C
(53°F)
12°C
(54°F)
11°C
(52°F)
7°C
(46°F)
5°C
(41°F)
3°C
(38°F)
Mean minimum -1°C
(30°F)
-2°C
(28°F)
-1°C
(31°F)
1°C
(34°F)
3°C
(38°F)
5°C
(41°F)
9°C
(48°F)
9°C
(49°F)
6°C
(43°F)
3°C
(38°F)
-1°C
(30°F)
-1°C
(31°F)
Minimum -3°C
(27°F)
-4°C
(25°F)
-2°C
(29°F)
-1°C
(31°F)
1°C
(34°F)
4°C
(39°F)
8°C
(46°F)
8°C
(47°F)
4°C
(39°F)
2°C
(35°F)
-3°C
(26°F)
-1°C
(30°F)

Compare climate in Rio Dell with other places

Compare temperature, precipitation, sunshine, UV index in Rio Dell, California, United States with other places around the world.

Monthly average precipitation in Rio Dell, California, United States §

Rio Dell usually has the most precipitation in January, February and March, with an average of 14 rainy days and 198 mm (7.8 inches) of precipitation per month. The driest months in Rio Dell are June, July and August. On average, 6 mm (0.2 inches) of precipitation falls during these months.

Monthly average precipitation and precipitation days in Rio Dell, California, United States. Generated using Copernicus Climate Change Service information. Data for period from January 2017 to January 2022.
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Average precipitation mm (inches) 214 (8.4) 201 (7.9) 177 (7.0) 101 (4.0) 65 (2.6) 16 (0.6) 2 (0.1) 1 (0.0) 23 (0.9) 59 (2.3) 128 (5.1) 155 (6.1)
Average precipitation days (≥ 1 mm) 14 12 16 10 5 3 0 0 3 5 10 12

Monthly sunshine hours in Rio Dell, California, United States §

The sunniest months in Rio Dell are June, July and August, when the sun shines an average of 12 hours 22 minutes a day. Least sunny months in Rio Dell: January, February and December receive an average of 5 hours 13 minutes of sunshine daily.

Mean monthly sunshine duration, average sunshine hours per day and mean daily daylight hours in Rio Dell, California, United States. Generated using Copernicus Atmosphere Monitoring Service information. Data for period from January 2017 to January 2022.
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Mean monthly sunshine hours 120 189 244 277 340 377 398 361 303 271 203 165
Mean daily daylight hours 9h 38m 10h 40m 11h 58m 13h 19m 14h 26m 15h 0m 14h 41m 13h 41m 12h 24m 11h 4m 9h 54m 9h 19m

Solar UV radiation in Rio Dell, California, United States §

Rio Dell experiences the highest level of ultraviolet (UV) radiation in May, June and August, when the maximum UV index can reach values of 10 - 11, which corresponds to the Very High / Extreme category of sun exposure. January, February and December are in the Low / Moderate exposure category. In these months, the maximum values of the UV index do not exceed 4. For more detailed information, check out our hourly Rio Dell UV Index data.

Average daily maximum UV levels by month for Rio Dell, California, United States. Generated using Copernicus Atmosphere Monitoring Service information. Data for period from January 2022 to January 2023.
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
UV Index (month maximum) 3 4 7 8 10 11 10 10 8 6 4 2

Detailed Monthly Weather Insights for Rio Dell, California, United States

Discover in-depth weather details for every month in Rio Dell. Click through the links below for comprehensive overviews of temperature trends, precipitation levels, sunshine hours, and solar UV radiation specifics. Whether planning a visit or simply curious about Rio Dell's climate nuances, these monthly breakdowns provide the information you need for an informed understanding of what to expect throughout the year.

Each link leads to a detailed account of the typical weather conditions for that month, providing both locals and tourists with vital information to plan their daily activities, wardrobe, and travel itineraries accordingly.