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Monthly climate in Healdsburg, California, United States

Last updated: May 6, 2024

Under the Köppen–Geiger climate classification Healdsburg features a warm-summer Mediterranean climate (Csb).Temperatures typically range between 9 °C (48 °F) and 22 °C (71 °F) through the year, but rarely can drop to -4 °C (26 °F) or can rise to as high as 41 °C (105 °F).The average annual precipitation amounts to about 668 mm (26.3 inches) and receives 50 rainy days on the 1 mm (0.04 inches) threshold annually.Healdsburg enjoys an average of 3381 hours of sunshine throughout the year, and daylight varies from 9 hours 30 minutes to 14 hours 48 minutes per day.

Monthly average temperatures in Healdsburg, California, United States §

The warmest months in Healdsburg are June, July and August, with daily mean temperatures ranging from 21 to 22 °C (69 - 71 °F) throughout the day. The coldest temperatures usually occur in January, February and December, when daily mean temperatures range from 9 to 10 °C (48 - 50 °F) throughout the day. On average each year, Healdsburg experiences 118 days above 25 °C (77.0 °F) and 6 days below 0 °C (32.0 °F).

Monthly average temperatures with daily means, minimums and maximums for period, average high and low temperatures in Healdsburg, 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 24°C
(75°F)		 26°C
(80°F)		 28°C
(83°F)		 31°C
(89°F)		 35°C
(96°F)		 40°C
(105°F)		 38°C
(101°F)		 38°C
(101°F)		 41°C
(105°F)		 35°C
(96°F)		 28°C
(83°F)		 23°C
(73°F)
Mean maximum 21°C
(69°F)		 23°C
(73°F)		 26°C
(78°F)		 29°C
(84°F)		 32°C
(90°F)		 36°C
(96°F)		 36°C
(98°F)		 36°C
(97°F)		 37°C
(99°F)		 32°C
(90°F)		 25°C
(77°F)		 20°C
(68°F)
Average high 14°C
(58°F)		 16°C
(62°F)		 17°C
(63°F)		 20°C
(69°F)		 23°C
(75°F)		 28°C
(83°F)		 30°C
(86°F)		 29°C
(85°F)		 28°C
(83°F)		 25°C
(77°F)		 19°C
(66°F)		 14°C
(58°F)
Daily mean 9°C
(49°F)		 10°C
(50°F)		 11°C
(52°F)		 14°C
(57°F)		 17°C
(62°F)		 21°C
(69°F)		 22°C
(71°F)		 21°C
(71°F)		 20°C
(69°F)		 17°C
(63°F)		 12°C
(54°F)		 9°C
(48°F)
Average low 5°C
(41°F)		 5°C
(40°F)		 6°C
(43°F)		 8°C
(47°F)		 11°C
(52°F)		 14°C
(57°F)		 15°C
(59°F)		 15°C
(60°F)		 14°C
(57°F)		 10°C
(51°F)		 6°C
(43°F)		 4°C
(40°F)
Mean minimum -1°C
(31°F)		 -1°C
(30°F)		 0°C
(33°F)		 3°C
(38°F)		 7°C
(44°F)		 10°C
(50°F)		 12°C
(54°F)		 12°C
(54°F)		 9°C
(49°F)		 5°C
(41°F)		 0°C
(32°F)		 -1°C
(31°F)
Minimum -2°C
(28°F)		 -4°C
(26°F)		 -1°C
(30°F)		 3°C
(37°F)		 3°C
(39°F)		 8°C
(47°F)		 11°C
(53°F)		 10°C
(51°F)		 7°C
(45°F)		 3°C
(38°F)		 -1°C
(30°F)		 -2°C
(29°F)

Compare climate in Healdsburg with other places

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

Monthly average precipitation in Healdsburg, California, United States §

Healdsburg usually has the most precipitation in January, February and December, with an average of 8 rainy days and 132 mm (5.2 inches) of precipitation per month.The driest months in Healdsburg are July, August and September. On average, 1 mm (0.0 inches) of precipitation falls during these months.

Monthly average precipitation and precipitation days in Healdsburg, 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) 139 (5.5) 155 (6.1) 97 (3.8) 45 (1.8) 27 (1.1) 2 (0.1) 0 (0.0) 0 (0.0) 2 (0.1) 41 (1.6) 58 (2.3) 101 (4.0)
Average precipitation days (≥ 1 mm) 8 8 11 5 3 0 0 0 0 2 5 8

Monthly sunshine hours in Healdsburg, California, United States §

The sunniest months in Healdsburg are May, June and July, when the sun shines an average of 12 hours 15 minutes a day.Least sunny months in Healdsburg: January, February and December receive an average of 5 hours 53 minutes of sunshine daily.

Mean monthly sunshine duration, average sunshine hours per day and mean daily daylight hours in Healdsburg, 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 141 210 261 297 356 382 389 348 312 277 218 184
Mean daily daylight hours 9h 48m 10h 45m 11h 59m 13h 14m 14h 17m 14h 48m 14h 31m 13h 34m 12h 22m 11h 8m 10h 2m 9h 30m

Solar UV radiation in Healdsburg, California, United States §

Healdsburg experiences the highest level of ultraviolet (UV) radiation in June, July 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, November and December are in the 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 Healdsburg UV Index data.

Average daily maximum UV levels by month for Healdsburg, 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 5 7 9 10 11 11 10 9 6 4 3