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Monthly climate in Duncan, Arizona, United States

Last updated: March 2, 2024

Under the Köppen–Geiger climate classification Duncan features a cold semi-arid climate (BSk). Temperatures typically range between 7 °C (45 °F) and 29 °C (84 °F) through the year, but rarely can drop to -12 °C (12 °F) or can rise to as high as 41 °C (106 °F). The average annual precipitation amounts to about 257 mm (10.1 inches) and receives 42 rainy days on the 1 mm (0.04 inches) threshold annually. Duncan enjoys an average of 3616 hours of sunshine throughout the year, and daylight varies from 10 hours 1 minutes to 14 hours 15 minutes per day.

Monthly average temperatures in Duncan, Arizona, United States §

The warmest months in Duncan are June, July and August, with daily mean temperatures ranging from 28 to 29 °C (83 - 84 °F) throughout the day. The coldest temperatures usually occur in January, February and December, when daily mean temperatures range from 7 to 9 °C (45 - 48 °F) throughout the day. On average each year, Duncan experiences 170 days above 25 °C (77.0 °F) and 34 days below 0 °C (32.0 °F).

Monthly average temperatures with daily means, minimums and maximums for period, average high and low temperatures in Duncan, 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 21°C
(70°F)		 25°C
(77°F)		 30°C
(86°F)		 33°C
(91°F)		 37°C
(99°F)		 41°C
(106°F)		 41°C
(106°F)		 40°C
(104°F)		 38°C
(101°F)		 33°C
(92°F)		 28°C
(83°F)		 23°C
(73°F)
Mean maximum 18°C
(66°F)		 22°C
(72°F)		 28°C
(82°F)		 31°C
(88°F)		 35°C
(95°F)		 38°C
(101°F)		 39°C
(103°F)		 38°C
(100°F)		 36°C
(97°F)		 31°C
(89°F)		 26°C
(79°F)		 20°C
(69°F)
Average high 14°C
(57°F)		 16°C
(61°F)		 21°C
(69°F)		 26°C
(79°F)		 30°C
(86°F)		 35°C
(96°F)		 34°C
(94°F)		 34°C
(94°F)		 31°C
(88°F)		 26°C
(78°F)		 20°C
(68°F)		 14°C
(57°F)
Daily mean 7°C
(45°F)		 9°C
(48°F)		 14°C
(57°F)		 19°C
(67°F)		 23°C
(74°F)		 29°C
(84°F)		 29°C
(84°F)		 28°C
(83°F)		 25°C
(77°F)		 19°C
(66°F)		 13°C
(56°F)		 8°C
(46°F)
Average low 1°C
(34°F)		 3°C
(37°F)		 6°C
(44°F)		 11°C
(53°F)		 15°C
(60°F)		 21°C
(70°F)		 23°C
(73°F)		 22°C
(72°F)		 18°C
(66°F)		 12°C
(54°F)		 6°C
(44°F)		 2°C
(35°F)
Mean minimum -6°C
(21°F)		 -5°C
(24°F)		 -0°C
(32°F)		 5°C
(40°F)		 9°C
(48°F)		 16°C
(61°F)		 18°C
(66°F)		 19°C
(66°F)		 13°C
(56°F)		 5°C
(41°F)		 0°C
(33°F)		 -5°C
(23°F)
Minimum -9°C
(17°F)		 -9°C
(16°F)		 -2°C
(29°F)		 3°C
(37°F)		 7°C
(44°F)		 13°C
(55°F)		 18°C
(64°F)		 17°C
(63°F)		 11°C
(52°F)		 1°C
(34°F)		 -2°C
(29°F)		 -12°C
(12°F)

Compare climate in Duncan with other places

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

Monthly average precipitation in Duncan, Arizona, United States §

Duncan usually has the most precipitation in February, July and September, with an average of 6 rainy days and 37 mm (1.5 inches) of precipitation per month. The driest months in Duncan are April, May and June. On average, 4 mm (0.2 inches) of precipitation falls during these months.

Monthly average precipitation and precipitation days in Duncan, 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) 26 (1.0) 34 (1.3) 18 (0.7) 3 (0.1) 3 (0.1) 6 (0.2) 50 (2.0) 23 (0.9) 29 (1.1) 15 (0.6) 25 (1.0) 25 (1.0)
Average precipitation days (≥ 1 mm) 5 5 4 0 1 1 9 5 4 2 2 4

Monthly sunshine hours in Duncan, Arizona, United States §

The sunniest months in Duncan are May, June and July, when the sun shines an average of 11 hours 54 minutes a day. Least sunny months in Duncan: January, February and December receive an average of 7 hours 26 minutes of sunshine daily.

Mean monthly sunshine duration, average sunshine hours per day and mean daily daylight hours in Duncan, 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 198 240 302 334 370 368 356 338 310 297 261 237
Mean daily daylight hours 10h 15m 11h 1m 12h 0m 13h 0m 13h 50m 14h 15m 14h 1m 13h 17m 12h 19m 11h 19m 10h 27m 10h 1m

Solar UV radiation in Duncan, Arizona, United States §

Duncan experiences the highest level of ultraviolet (UV) radiation in May, June 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 Duncan UV Index data.

Average daily maximum UV levels by month for Duncan, 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) 5 7 10 11 12 13 12 12 11 8 6 4

Detailed Monthly Weather Insights for Duncan, Arizona, United States

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