Last updated: May 6, 2024
Under the Köppen–Geiger climate classification Helena features a humid subtropical climate (Cfa).Temperatures typically range between 12 °C (53 °F) and 28 °C (82 °F) through the year, but rarely can drop to -7 °C (20 °F) or can rise to as high as 36 °C (98 °F).The average annual precipitation amounts to about 1630 mm (64.2 inches) and receives 159 rainy days on the 1 mm (0.04 inches) threshold annually.Helena enjoys an average of 3296 hours of sunshine throughout the year, and daylight varies from 10 hours 11 minutes to 14 hours 4 minutes per day.
The warmest months in Helena are June, July and August, with daily mean temperatures ranging from 27 to 28 °C (81 - 82 °F) throughout the day. The coldest temperatures usually occur in January, February and December, when daily mean temperatures range from 12 to 15 °C (53 - 59 °F) throughout the day. On average each year, Helena experiences 181 days above 25 °C (77.0 °F) and 6 days below 0 °C (32.0 °F).
Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
---|---|---|---|---|---|---|---|---|---|---|---|---|
Maximum | 26°C (79°F) | 26°C (80°F) | 30°C (86°F) | 31°C (88°F) | 34°C (93°F) | 35°C (95°F) | 36°C (97°F) | 36°C (97°F) | 36°C (98°F) | 35°C (95°F) | 28°C (83°F) | 26°C (80°F) |
Mean maximum | 24°C (75°F) | 25°C (78°F) | 28°C (82°F) | 29°C (84°F) | 32°C (89°F) | 33°C (91°F) | 35°C (95°F) | 34°C (94°F) | 34°C (94°F) | 32°C (90°F) | 27°C (81°F) | 25°C (77°F) |
Average high | 17°C (62°F) | 20°C (68°F) | 22°C (73°F) | 25°C (77°F) | 28°C (83°F) | 30°C (87°F) | 31°C (89°F) | 31°C (89°F) | 30°C (87°F) | 27°C (81°F) | 21°C (70°F) | 18°C (65°F) |
Daily mean | 12°C (53°F) | 15°C (59°F) | 18°C (64°F) | 20°C (68°F) | 24°C (76°F) | 27°C (81°F) | 28°C (82°F) | 28°C (82°F) | 26°C (79°F) | 23°C (73°F) | 15°C (60°F) | 14°C (57°F) |
Average low | 7°C (45°F) | 10°C (51°F) | 13°C (56°F) | 15°C (59°F) | 20°C (68°F) | 24°C (75°F) | 25°C (76°F) | 24°C (76°F) | 23°C (73°F) | 18°C (65°F) | 10°C (51°F) | 9°C (49°F) |
Mean minimum | -3°C (27°F) | 0°C (33°F) | 2°C (36°F) | 7°C (44°F) | 13°C (56°F) | 20°C (68°F) | 23°C (73°F) | 22°C (72°F) | 17°C (63°F) | 9°C (48°F) | 2°C (35°F) | 0°C (33°F) |
Minimum | -7°C (20°F) | -5°C (22°F) | 0°C (33°F) | 5°C (41°F) | 9°C (49°F) | 17°C (64°F) | 22°C (71°F) | 21°C (71°F) | 13°C (56°F) | 4°C (40°F) | -3°C (28°F) | -2°C (29°F) |
Compare temperature, precipitation, sunshine, UV index in Helena, Mississippi, United States with other places around the world.
Helena usually has the most precipitation in June, July and August, with an average of 21 rainy days and 214 mm (8.4 inches) of precipitation per month.The driest months in Helena are January, March and November. On average, 78 mm (3.1 inches) of precipitation falls during these months.
Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
---|---|---|---|---|---|---|---|---|---|---|---|---|
Average precipitation mm (inches) | 90 (3.5) | 104 (4.1) | 87 (3.4) | 120 (4.7) | 132 (5.2) | 246 (9.7) | 179 (7.0) | 218 (8.6) | 155 (6.1) | 134 (5.3) | 56 (2.2) | 109 (4.3) |
Average precipitation days (≥ 1 mm) | 8 | 12 | 12 | 10 | 11 | 20 | 22 | 23 | 14 | 11 | 5 | 11 |
The sunniest months in Helena are May, July and August, when the sun shines an average of 10 hours 22 minutes a day.Least sunny months in Helena: January, February and December receive an average of 6 hours 50 minutes of sunshine daily.
Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
---|---|---|---|---|---|---|---|---|---|---|---|---|
Mean monthly sunshine hours | 181 | 216 | 281 | 292 | 328 | 300 | 321 | 314 | 282 | 287 | 265 | 224 |
Mean daily daylight hours | 10h 24m | 11h 6m | 12h 0m | 12h 55m | 13h 42m | 14h 4m | 13h 52m | 13h 11m | 12h 18m | 11h 22m | 10h 35m | 10h 11m |
Helena experiences the highest level of ultraviolet (UV) radiation in April, July and August, when the maximum UV index can reach values of 11 - 12, 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 Helena UV Index data.
Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
---|---|---|---|---|---|---|---|---|---|---|---|---|
UV Index (month maximum) | 5 | 8 | 9 | 11 | 11 | 11 | 12 | 11 | 10 | 8 | 6 | 4 |