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Monthly climate in Round Rock, Arizona, United States

Last updated: May 6, 2024

Under the Köppen–Geiger climate classification Round Rock features a cold semi-arid climate (BSk).Temperatures typically range between 0 °C (33 °F) and 26 °C (80 °F) through the year, but rarely can drop to -23 °C (-8 °F) or can rise to as high as 38 °C (101 °F).The average annual precipitation amounts to about 185 mm (7.3 inches) and receives 41 rainy days on the 1 mm (0.04 inches) threshold annually.Round Rock enjoys an average of 3615 hours of sunshine throughout the year, and daylight varies from 9 hours 41 minutes to 14 hours 35 minutes per day.

Monthly average temperatures in Round Rock, Arizona, United States §

The warmest months in Round Rock are June, July and August, with daily mean temperatures ranging from 24 to 26 °C (76 - 80 °F) throughout the day. The coldest temperatures usually occur in January, February and December, when daily mean temperatures range from 0 to 3 °C (33 - 38 °F) throughout the day. On average each year, Round Rock experiences 116 days above 25 °C (77.0 °F) and 103 days below 0 °C (32.0 °F).

Monthly average temperatures with daily means, minimums and maximums for period, average high and low temperatures in Round Rock, Arizona, 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 16°C
(61°F)		 21°C
(70°F)		 26°C
(79°F)		 29°C
(84°F)		 32°C
(90°F)		 37°C
(100°F)		 38°C
(101°F)		 36°C
(98°F)		 35°C
(96°F)		 29°C
(85°F)		 22°C
(72°F)		 17°C
(62°F)
Mean maximum 12°C
(54°F)		 17°C
(63°F)		 22°C
(72°F)		 27°C
(80°F)		 30°C
(87°F)		 34°C
(94°F)		 37°C
(98°F)		 35°C
(95°F)		 34°C
(93°F)		 27°C
(81°F)		 20°C
(68°F)		 13°C
(56°F)
Average high 6°C
(43°F)		 10°C
(50°F)		 14°C
(58°F)		 20°C
(68°F)		 24°C
(76°F)		 31°C
(88°F)		 32°C
(91°F)		 32°C
(90°F)		 28°C
(82°F)		 19°C
(67°F)		 14°C
(57°F)		 7°C
(45°F)
Daily mean 0°C
(33°F)		 3°C
(38°F)		 8°C
(46°F)		 13°C
(55°F)		 17°C
(63°F)		 24°C
(76°F)		 26°C
(80°F)		 25°C
(78°F)		 21°C
(69°F)		 12°C
(54°F)		 7°C
(44°F)		 1°C
(34°F)
Average low -5°C
(23°F)		 -3°C
(27°F)		 1°C
(34°F)		 5°C
(41°F)		 9°C
(48°F)		 15°C
(59°F)		 19°C
(66°F)		 17°C
(64°F)		 13°C
(55°F)		 5°C
(41°F)		 -0°C
(32°F)		 -4°C
(24°F)
Mean minimum -15°C
(4°F)		 -11°C
(12°F)		 -7°C
(19°F)		 -4°C
(25°F)		 2°C
(37°F)		 8°C
(46°F)		 14°C
(57°F)		 13°C
(56°F)		 4°C
(40°F)		 -5°C
(24°F)		 -8°C
(17°F)		 -13°C
(10°F)
Minimum -23°C
(-8°F)		 -16°C
(4°F)		 -12°C
(10°F)		 -5°C
(23°F)		 -0°C
(32°F)		 5°C
(41°F)		 12°C
(54°F)		 11°C
(52°F)		 1°C
(34°F)		 -10°C
(15°F)		 -11°C
(12°F)		 -15°C
(6°F)

Compare climate in Round Rock with other places

Compare temperature, precipitation, sunshine, UV index in Round Rock, Arizona, United States with other places around the world.

Monthly average precipitation in Round Rock, Arizona, United States §

Round Rock usually has the most precipitation in January, February and March, with an average of 6 rainy days and 25 mm (1.0 inches) of precipitation per month.The driest months in Round Rock are June, August and November. On average, 6 mm (0.2 inches) of precipitation falls during these months.

Monthly average precipitation and precipitation days in Round Rock, Arizona, 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) 22 (0.9) 22 (0.9) 31 (1.2) 10 (0.4) 14 (0.6) 3 (0.1) 14 (0.5) 4 (0.2) 12 (0.5) 21 (0.8) 10 (0.4) 22 (0.8)
Average precipitation days (≥ 1 mm) 6 5 7 2 3 0 3 1 3 4 2 5

Monthly sunshine hours in Round Rock, Arizona, United States §

The sunniest months in Round Rock are May, June and July, when the sun shines an average of 12 hours 7 minutes a day.Least sunny months in Round Rock: January, February and December receive an average of 7 hours 14 minutes of sunshine daily.

Mean monthly sunshine duration, average sunshine hours per day and mean daily daylight hours in Round Rock, Arizona, 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 190 236 293 327 364 374 375 353 317 293 257 230
Mean daily daylight hours 9h 58m 10h 51m 11h 59m 13h 9m 14h 7m 14h 35m 14h 20m 13h 28m 12h 21m 11h 12m 10h 12m 9h 41m

Solar UV radiation in Round Rock, Arizona, United States §

Round Rock experiences the highest level of ultraviolet (UV) radiation in June, July and August, when the maximum UV index can reach values of 12 - 13, which corresponds to the Extreme category of sun exposure.January, November and December are in the Moderate / High exposure category. In these months, the maximum values of the UV index do not exceed 6. For more detailed information, check out our hourly Round Rock UV Index data.

Average daily maximum UV levels by month for Round Rock, Arizona, 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 7 9 11 12 13 13 12 11 8 6 4