| Climate data for Salt Lake City International Airport (1991–2020 normals,[a] extremes 1874–present)[b] | |||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Month | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Year |
| Record high °F (°C) | 63 (17) | 69 (21) | 80 (27) | 89 (32) | 99 (37) | 107 (42) | 107 (42) | 106 (41) | 107 (42) | 89 (32) | 75 (24) | 69 (21) | 107 (42) |
| Mean maximum °F (°C) | 51.8 (11.0) | 58.8 (14.9) | 70.4 (21.3) | 80.2 (26.8) | 88.9 (31.6) | 97.9 (36.6) | 101.9 (38.8) | 99.6 (37.6) | 93.9 (34.4) | 82.0 (27.8) | 67.1 (19.5) | 54.3 (12.4) | 102.3 (39.1) |
| Mean daily maximum °F (°C) | 38.6 (3.7) | 44.7 (7.1) | 55.3 (12.9) | 61.9 (16.6) | 72.6 (22.6) | 84.1 (28.9) | 94.0 (34.4) | 91.7 (33.2) | 80.6 (27.0) | 65.5 (18.6) | 50.7 (10.4) | 39.0 (3.9) | 64.9 (18.3) |
| Daily mean °F (°C) | 31.4 (−0.3) | 36.6 (2.6) | 45.8 (7.7) | 51.8 (11.0) | 61.5 (16.4) | 71.6 (22.0) | 81.1 (27.3) | 79.1 (26.2) | 68.4 (20.2) | 54.6 (12.6) | 41.7 (5.4) | 32.2 (0.1) | 54.7 (12.6) |
| Mean daily minimum °F (°C) | 24.2 (−4.3) | 28.6 (−1.9) | 36.3 (2.4) | 41.8 (5.4) | 50.4 (10.2) | 59.1 (15.1) | 68.2 (20.1) | 66.6 (19.2) | 56.3 (13.5) | 43.6 (6.4) | 32.8 (0.4) | 25.3 (−3.7) | 44.4 (6.9) |
| Mean minimum °F (°C) | 6.5 (−14.2) | 9.2 (−12.7) | 21.0 (−6.1) | 28.7 (−1.8) | 34.8 (1.6) | 43.5 (6.4) | 54.9 (12.7) | 52.4 (11.3) | 39.7 (4.3) | 29.5 (−1.4) | 16.9 (−8.4) | 7.3 (−13.7) | 0.9 (−17.3) |
| Record low °F (°C) | −22 (−30) | −30 (−34) | 0 (−18) | 14 (−10) | 25 (−4) | 32 (0) | 40 (4) | 37 (3) | 27 (−3) | 14 (−10) | −14 (−26) | −21 (−29) | −30 (−34) |
| Average precipitation inches (mm) | 1.43 (36) | 1.30 (33) | 1.75 (44) | 2.16 (55) | 1.82 (46) | 0.95 (24) | 0.49 (12) | 0.58 (15) | 1.06 (27) | 1.26 (32) | 1.32 (34) | 1.40 (36) | 15.52 (394) |
| Average snowfall inches (cm) | 12.7 (32) | 10.7 (27) | 5.9 (15) | 2.9 (7.4) | 0.1 (0.25) | 0.0 (0.0) | 0.0 (0.0) | 0.0 (0.0) | 0.0 (0.0) | 0.5 (1.3) | 7.0 (18) | 12.1 (31) | 51.9 (132) |
| Average precipitation days (≥ 0.01 in) | 10.3 | 9.5 | 9.2 | 10.4 | 8.9 | 4.8 | 3.9 | 4.9 | 5.2 | 6.5 | 8.3 | 9.6 | 91.5 |
| Average snowy days (≥ 0.1 in) | 7.6 | 6.0 | 4.0 | 2.2 | 0.2 | 0.0 | 0.0 | 0.0 | 0.0 | 0.7 | 3.6 | 7.1 | 31.4 |
| Average relative humidity (%) | 74.0 | 69.8 | 60.2 | 53.2 | 48.7 | 41.4 | 35.9 | 38.5 | 45.6 | 55.7 | 66.3 | 74.3 | 55.3 |
| Average dew point °F (°C) | 19.9 (−6.7) | 24.1 (−4.4) | 27.1 (−2.7) | 31.1 (−0.5) | 36.9 (2.7) | 41.4 (5.2) | 45.7 (7.6) | 45.1 (7.3) | 39.9 (4.4) | 34.5 (1.4) | 28.4 (−2.0) | 21.7 (−5.7) | 33.0 (0.5) |
| Mean monthly sunshine hours | 127.4 | 163.1 | 241.9 | 269.1 | 321.7 | 360.5 | 380.5 | 352.5 | 301.1 | 248.1 | 150.4 | 113.1 | 3,029.4 |
| Percent possible sunshine | 43 | 55 | 65 | 67 | 72 | 80 | 83 | 83 | 81 | 72 | 50 | 39 | 68 |
| Average ultraviolet index | 1.7 | 2.7 | 4.6 | 6.6 | 8.4 | 9.8 | 10.4 | 9.0 | 6.6 | 4.0 | 2.2 | 1.4 | 5.6 |
| Source 1: NOAA (relative humidity and sun 1961–1990)[1][2][3][4][5] | |||||||||||||
| Source 2: UV Index Today (1995 to 2022)[6] | |||||||||||||
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