Last updated: May 6, 2024
Under the Köppen–Geiger climate classification Union features a humid subtropical climate (Cfa).Temperatures typically range between 0 °C (33 °F) and 26 °C (79 °F) through the year, but rarely can drop to -20 °C (-5 °F) or can rise to as high as 39 °C (103 °F).The average annual precipitation amounts to about 1180 mm (46.4 inches) and receives 120 rainy days on the 1 mm (0.04 inches) threshold annually.Union enjoys an average of 2964 hours of sunshine throughout the year, and daylight varies from 9 hours 31 minutes to 14 hours 47 minutes per day.
The warmest months in Union are June, July and August, with daily mean temperatures ranging from 24 to 26 °C (76 - 79 °F) throughout the day. The coldest temperatures usually occur in January, February and December, when daily mean temperatures range from 0 to 4 °C (33 - 39 °F) throughout the day. On average each year, Union experiences 121 days above 25 °C (77.0 °F) and 75 days below 0 °C (32.0 °F).
Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
---|---|---|---|---|---|---|---|---|---|---|---|---|
Maximum | 20°C (68°F) | 25°C (77°F) | 29°C (84°F) | 31°C (88°F) | 34°C (93°F) | 37°C (98°F) | 39°C (103°F) | 36°C (96°F) | 35°C (95°F) | 33°C (92°F) | 25°C (78°F) | 23°C (74°F) |
Mean maximum | 17°C (63°F) | 21°C (70°F) | 25°C (77°F) | 29°C (84°F) | 32°C (89°F) | 34°C (93°F) | 36°C (98°F) | 35°C (95°F) | 34°C (93°F) | 32°C (89°F) | 22°C (73°F) | 21°C (69°F) |
Average high | 5°C (41°F) | 7°C (46°F) | 14°C (57°F) | 18°C (65°F) | 24°C (76°F) | 30°C (85°F) | 31°C (89°F) | 29°C (85°F) | 28°C (83°F) | 21°C (69°F) | 12°C (55°F) | 9°C (49°F) |
Daily mean | 0°C (33°F) | 2°C (36°F) | 8°C (47°F) | 13°C (55°F) | 19°C (66°F) | 24°C (76°F) | 26°C (79°F) | 24°C (76°F) | 22°C (72°F) | 15°C (59°F) | 7°C (45°F) | 4°C (39°F) |
Average low | -4°C (26°F) | -3°C (27°F) | 4°C (39°F) | 7°C (45°F) | 14°C (58°F) | 19°C (67°F) | 22°C (71°F) | 19°C (67°F) | 17°C (62°F) | 10°C (50°F) | 2°C (36°F) | -1°C (31°F) |
Mean minimum | -15°C (5°F) | -15°C (6°F) | -8°C (18°F) | -1°C (30°F) | 6°C (44°F) | 15°C (59°F) | 17°C (63°F) | 14°C (58°F) | 9°C (49°F) | -0°C (32°F) | -7°C (19°F) | -10°C (14°F) |
Minimum | -20°C (-5°F) | -20°C (-4°F) | -16°C (3°F) | -4°C (24°F) | 4°C (39°F) | 12°C (54°F) | 15°C (60°F) | 13°C (56°F) | 8°C (46°F) | -3°C (26°F) | -14°C (8°F) | -16°C (4°F) |
Compare temperature, precipitation, sunshine, UV index in Union, Missouri, United States with other places around the world.
Union usually has the most precipitation in March, May and August, with an average of 12 rainy days and 141 mm (5.6 inches) of precipitation per month.The driest months in Union are September, November and December. On average, 60 mm (2.3 inches) of precipitation falls during these months.
Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
---|---|---|---|---|---|---|---|---|---|---|---|---|
Average precipitation mm (inches) | 75 (2.9) | 80 (3.1) | 126 (5.0) | 126 (5.0) | 152 (6.0) | 89 (3.5) | 100 (3.9) | 145 (5.7) | 55 (2.2) | 108 (4.2) | 69 (2.7) | 54 (2.1) |
Average precipitation days (≥ 1 mm) | 7 | 10 | 11 | 13 | 14 | 11 | 10 | 13 | 6 | 11 | 8 | 6 |
The sunniest months in Union are June, July and August, when the sun shines an average of 10 hours 50 minutes a day.Least sunny months in Union: January, February and December receive an average of 5 hours 31 minutes of sunshine daily.
Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
---|---|---|---|---|---|---|---|---|---|---|---|---|
Mean monthly sunshine hours | 128 | 177 | 207 | 239 | 281 | 323 | 347 | 325 | 287 | 236 | 212 | 196 |
Mean daily daylight hours | 9h 48m | 10h 46m | 11h 58m | 13h 13m | 14h 16m | 14h 47m | 14h 30m | 13h 34m | 12h 22m | 11h 8m | 10h 3m | 9h 31m |
Union 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, 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 Union UV Index data.
Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
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UV Index (month maximum) | 3 | 5 | 6 | 9 | 10 | 11 | 11 | 10 | 9 | 7 | 5 | 3 |