| Climate data for Pittsburgh (Pittsburgh 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) | 75 (24) |
78 (26) |
84 (29) |
90 (32) |
95 (35) |
98 (37) |
103 (39) |
103 (39) |
102 (39) |
91 (33) |
82 (28) |
74 (23) |
103 (39) |
| Mean maximum °F (°C) | 61.5 (16.4) |
63.2 (17.3) |
73.5 (23.1) |
81.5 (27.5) |
86.8 (30.4) |
90.4 (32.4) |
91.3 (32.9) |
90.3 (32.4) |
88.2 (31.2) |
79.9 (26.6) |
70.8 (21.6) |
62.6 (17.0) |
92.6 (33.7) |
| Mean daily maximum °F (°C) | 36.3 (2.4) |
39.6 (4.2) |
49.1 (9.5) |
62.4 (16.9) |
71.9 (22.2) |
79.4 (26.3) |
82.9 (28.3) |
81.7 (27.6) |
75.1 (23.9) |
63.1 (17.3) |
50.9 (10.5) |
40.6 (4.8) |
61.1 (16.2) |
| Daily mean °F (°C) | 28.8 (−1.8) |
31.4 (−0.3) |
39.7 (4.3) |
51.5 (10.8) |
61.2 (16.2) |
69.4 (20.8) |
73.2 (22.9) |
71.8 (22.1) |
64.9 (18.3) |
53.4 (11.9) |
42.6 (5.9) |
33.7 (0.9) |
51.8 (11.0) |
| Mean daily minimum °F (°C) | 21.4 (−5.9) |
23.2 (−4.9) |
30.3 (−0.9) |
40.7 (4.8) |
50.6 (10.3) |
59.3 (15.2) |
63.4 (17.4) |
62.0 (16.7) |
54.8 (12.7) |
43.7 (6.5) |
34.3 (1.3) |
26.7 (−2.9) |
42.5 (5.8) |
| Mean minimum °F (°C) | 1.0 (−17.2) |
5.0 (−15.0) |
11.7 (−11.3) |
25.4 (−3.7) |
35.6 (2.0) |
45.2 (7.3) |
52.5 (11.4) |
51.1 (10.6) |
41.2 (5.1) |
29.5 (−1.4) |
19.3 (−7.1) |
9.7 (−12.4) |
−1.5 (−18.6) |
| Record low °F (°C) | −22 (−30) |
−20 (−29) |
−5 (−21) |
11 (−12) |
26 (−3) |
34 (1) |
42 (6) |
39 (4) |
31 (−1) |
16 (−9) |
−1 (−18) |
−12 (−24) |
−22 (−30) |
| Average precipitation inches (mm) | 2.96 (75) |
2.62 (67) |
3.15 (80) |
3.32 (84) |
3.83 (97) |
4.12 (105) |
4.26 (108) |
3.52 (89) |
3.30 (84) |
2.83 (72) |
2.86 (73) |
2.84 (72) |
39.61 (1,006) |
| Average snowfall inches (cm) | 13.3 (34) |
11.7 (30) |
7.6 (19) |
1.0 (2.5) |
0.0 (0.0) |
0.0 (0.0) |
0.0 (0.0) |
0.0 (0.0) |
0.0 (0.0) |
0.4 (1.0) |
2.4 (6.1) |
7.7 (20) |
44.1 (112) |
| Average precipitation days (≥ 0.01 in) | 16.8 | 13.9 | 14.0 | 13.9 | 13.5 | 12.4 | 11.2 | 10.5 | 9.8 | 11.1 | 12.0 | 14.6 | 153.7 |
| Average snowy days (≥ 0.1 in) | 12.2 | 9.3 | 5.9 | 1.6 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.3 | 3.3 | 7.6 | 40.2 |
| Average relative humidity (%) | 69.9 | 67.3 | 64.1 | 59.8 | 63.4 | 66.2 | 68.8 | 71.2 | 72.0 | 68.3 | 70.2 | 71.9 | 67.8 |
| Average dew point °F (°C) | 17.2 (−8.2) |
18.9 (−7.3) |
26.8 (−2.9) |
34.5 (1.4) |
45.9 (7.7) |
55.2 (12.9) |
60.1 (15.6) |
59.5 (15.3) |
53.4 (11.9) |
40.8 (4.9) |
32.4 (0.2) |
23.2 (−4.9) |
39.0 (3.9) |
| Mean monthly sunshine hours | 93.9 | 108.5 | 155.4 | 182.8 | 217.4 | 242.2 | 254.9 | 228.4 | 196.7 | 167.3 | 99.4 | 74.4 | 2,021.3 |
| Percent possible sunshine | 31 | 36 | 42 | 46 | 49 | 54 | 56 | 54 | 53 | 48 | 33 | 26 | 45 |
| Average ultraviolet index | 2 | 2 | 2 | 4 | 6 | 6 | 6 | 5 | 4 | 3 | 2 | 1 | 4 |
| Source 1: NOAA (relative humidity, dew point and sun 1961–1990)[1][2][3][4] | |||||||||||||
| Source 2: Weather Atlas (UV)[5] | |||||||||||||
- ^ Mean monthly maxima and minima (i.e. the highest and lowest temperature readings during an entire month or year) calculated based on data at said location from 1991 to 2020.
- ^ Records kept September 1874 to June 1935 at the Weather Bureau Office across the Allegheny River from downtown, at Allegheny County Airport from July 1935 to 14 September 1952, and at Pittsburgh Int'l (KPIT) since 15 September 1952. Due to its river valley and urban location as well as elevation, many of the summertime warm minima temperature records set at the WBO have not even come close to being matched at KPIT, which is at-elevation and located in the western suburbs. For more information, see Threadex
- ^ "NowData – NOAA Online Weather Data". National Oceanic and Atmospheric Administration. Retrieved June 10, 2021.
- ^ "Station: Pittsburgh INTL AP, PA". U.S. Climate Normals 2020: U.S. Monthly Climate Normals (1991–2020). National Oceanic and Atmospheric Administration. Retrieved June 10, 2021.
- ^ "WMO Climate Normals for PITTSBURGH/GR PITTSBURGH INTL,PA 1961–1990". National Oceanic and Atmospheric Administration. Retrieved July 19, 2020.
- ^ "Average Percent Sunshine through 2009". National Climatic Data Center. Retrieved November 15, 2012.
- ^ "Pittsburgh, Pennsylvania, USA - Monthly weather forecast and Climate data". Weather Atlas. Retrieved July 4, 2019.