Monthly climate in Arnold, California, United States

Last updated: March 2, 2024

Under the Köppen–Geiger climate classification Arnold features a warm-summer Mediterranean climate (Csb). Temperatures typically range between 4 °C (39 °F) and 23 °C (73 °F) through the year, but rarely can drop to -14 °C (7 °F) or can rise to as high as 37 °C (98 °F). The average annual precipitation amounts to about 1417 mm (55.8 inches) and receives 77 rainy days on the 1 mm (0.04 inches) threshold annually. Arnold enjoys an average of 3469 hours of sunshine throughout the year, and daylight varies from 9 hours 31 minutes to 14 hours 46 minutes per day.

Monthly average temperatures in Arnold, California, United States §

The warmest months in Arnold are June, July and August, with daily mean temperatures ranging from 19 to 23 °C (66 - 73 °F) throughout the day. The coldest temperatures usually occur in January, February and December, when daily mean temperatures range from 4 to 4 °C (39 - 39 °F) throughout the day. On average each year, Arnold experiences 88 days above 25 °C (77.0 °F) and 82 days below 0 °C (32.0 °F).

Monthly average temperatures with daily means, minimums and maximums for period, average high and low temperatures in Arnold, 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 19°C
(67°F)
21°C
(70°F)
22°C
(72°F)
26°C
(78°F)
30°C
(87°F)
35°C
(95°F)
37°C
(98°F)
35°C
(96°F)
35°C
(96°F)
31°C
(88°F)
24°C
(75°F)
21°C
(71°F)
Mean maximum 16°C
(61°F)
18°C
(64°F)
19°C
(66°F)
24°C
(75°F)
27°C
(81°F)
31°C
(88°F)
34°C
(94°F)
34°C
(94°F)
33°C
(93°F)
27°C
(80°F)
22°C
(72°F)
17°C
(64°F)
Average high 9°C
(49°F)
10°C
(50°F)
11°C
(51°F)
15°C
(60°F)
19°C
(66°F)
25°C
(78°F)
30°C
(87°F)
30°C
(86°F)
26°C
(79°F)
21°C
(70°F)
15°C
(59°F)
9°C
(49°F)
Daily mean 4°C
(39°F)
4°C
(39°F)
5°C
(41°F)
9°C
(48°F)
13°C
(55°F)
19°C
(66°F)
23°C
(73°F)
22°C
(72°F)
18°C
(65°F)
13°C
(55°F)
8°C
(46°F)
4°C
(39°F)
Average low -1°C
(31°F)
-1°C
(30°F)
-0°C
(32°F)
2°C
(37°F)
6°C
(43°F)
11°C
(52°F)
14°C
(58°F)
14°C
(58°F)
11°C
(52°F)
5°C
(42°F)
2°C
(36°F)
-1°C
(30°F)
Mean minimum -9°C
(17°F)
-10°C
(14°F)
-7°C
(20°F)
-6°C
(22°F)
-1°C
(30°F)
4°C
(39°F)
11°C
(52°F)
10°C
(50°F)
5°C
(41°F)
0°C
(32°F)
-4°C
(24°F)
-7°C
(19°F)
Minimum -14°C
(7°F)
-14°C
(7°F)
-11°C
(12°F)
-12°C
(11°F)
-7°C
(19°F)
2°C
(35°F)
8°C
(46°F)
8°C
(47°F)
2°C
(36°F)
-1°C
(30°F)
-10°C
(15°F)
-9°C
(16°F)

Compare climate in Arnold with other places

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

Monthly average precipitation in Arnold, California, United States §

Arnold usually has the most precipitation in January, February and March, with an average of 11 rainy days and 265 mm (10.4 inches) of precipitation per month. The driest months in Arnold are July, August and September. On average, 7 mm (0.3 inches) of precipitation falls during these months.

Monthly average precipitation and precipitation days in Arnold, 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) 258 (10.2) 260 (10.2) 277 (10.9) 121 (4.8) 82 (3.2) 16 (0.6) 2 (0.1) 6 (0.2) 12 (0.5) 59 (2.3) 127 (5.0) 197 (7.8)
Average precipitation days (≥ 1 mm) 10 10 14 8 8 3 0 2 3 3 6 10

Monthly sunshine hours in Arnold, California, United States §

The sunniest months in Arnold are June, July and August, when the sun shines an average of 12 hours 31 minutes a day. Least sunny months in Arnold: January, February and December receive an average of 6 hours 8 minutes of sunshine daily.

Mean monthly sunshine duration, average sunshine hours per day and mean daily daylight hours in Arnold, 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 154 209 254 302 360 389 398 365 321 289 229 195
Mean daily daylight hours 9h 50m 10h 46m 11h 59m 13h 13m 14h 15m 14h 46m 14h 29m 13h 33m 12h 22m 11h 8m 10h 4m 9h 31m

Solar UV radiation in Arnold, California, United States §

Arnold experiences the highest level of ultraviolet (UV) radiation in May, June and August, when the maximum UV index can reach values of 11 - 12, which corresponds to the Extreme category of sun exposure. January, February and December are in the Moderate exposure category. In these months, the maximum values of the UV index do not exceed 5. For more detailed information, check out our hourly Arnold UV Index data.

Average daily maximum UV levels by month for Arnold, 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) 4 5 8 9 11 12 11 11 9 7 5 3

Detailed Monthly Weather Insights for Arnold, California, United States

Discover in-depth weather details for every month in Arnold. 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 Arnold'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.