Climate of Pennsylvania facts for kids
The climate of Pennsylvania is very interesting and changes a lot across the state. This is because Pennsylvania has many different types of land, like mountains, valleys, and flat areas. The state sits between two big climate zones. This means you can find different kinds of weather depending on where you are!
The southeastern part of Pennsylvania, especially around Philadelphia, has the warmest weather. Philadelphia itself is in a "humid subtropical climate" zone. This means it usually has warm, humid summers and mild winters. However, Philadelphia can still get colder, snowier winters than many other places in this climate zone. As you travel west into the mountains, the weather gets much colder. You'll also see more cloudy days and a lot more snow in winter.
Contents
Rain and Snow in Pennsylvania
Pennsylvania gets a good amount of rain and snow each year. On average, the whole state receives about 41 inches (104 cm) of rain annually. Areas in western Pennsylvania, especially near Lake Erie, can get over 100 inches (254 cm) of snow every winter!
When Tropical Storms Visit
Sometimes, big storms called tropical cyclones (like hurricanes) come to Pennsylvania. These usually happen in the summer and fall. Their biggest impact is bringing a lot of rain. For example, Hurricane Agnes in 1972 caused huge floods. It wasn't a strong hurricane when it hit land, but it combined with another weather system. This caused widespread rains of 6 to 12 inches (150 to 300 mm) across the Mid-Atlantic region. Some areas in western Schuylkill County even got up to 19 inches (480 mm) of rain! This led to severe flooding from Virginia all the way up to New York.
Pennsylvania's Weather Records
Pennsylvania has seen some extreme weather over the years, from super cold days to incredibly hot ones, and even record-breaking rainfall and snowfall.
Temperature Records
The coldest temperature ever recorded in Pennsylvania was a chilly −42°F (−41°C). This happened in Smethport on January 5, 1904.
The hottest temperature ever recorded was a scorching 111°F (44°C). This record was set in Phoenixville on July 9 and 10, 1936.
| Climate data for Pennsylvania | |||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Month | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Year |
| Record high °F (°C) | 85 (29) |
83 (28) |
92 (33) |
98 (37) |
102 (39) |
107 (42) |
111 (44) |
108 (42) |
106 (41) |
100 (38) |
88 (31) |
82 (28) |
111 (44) |
| Record low °F (°C) | −42 (−41) |
−39 (−39) |
−31 (−35) |
−5 (−21) |
10 (−12) |
20 (−7) |
28 (−2) |
23 (−5) |
17 (−8) |
7 (−14) |
−15 (−26) |
−29 (−34) |
−42 (−41) |
| Source: https://climate.met.psu.edu/data/state/staterecords.php | |||||||||||||
Rainfall Records
Pennsylvania has experienced some very heavy rainfalls.
| Event | Measurement | Date | Location |
|---|---|---|---|
| Greatest 24-Hour Rainfall | 13.50 inches (343 mm) | June 22, 1972 (during Hurricane Agnes) |
York |
It's worth noting that an amazing 34.50 inches (876 mm) of rain was estimated to have fallen in just 12 hours near Smethport on July 17, 1942. This might be one of the biggest 24-hour rainfalls ever recorded outside of tropical areas!
Snowfall Records
Pennsylvania is known for its snowy winters, especially in some areas.
| Event | Measurement | Date | Location |
|---|---|---|---|
| Greatest 24-hour snowfall | 38.0 inches (97 cm) | March 20, 1958 | Morgantown |
| Greatest two-day snowfall | 60.5 inches (154 cm) | December 24–26, 2017 | Erie |
| Greatest snow depth | 60.0 inches (152 cm) | March 22 & 23, 1958 | Gouldsboro |
Wettest Tropical Cyclone
Tropical cyclones can bring a lot of rain to Pennsylvania.
| Event | Measurement | Date | Location |
|---|---|---|---|
| Wettest Tropical Cyclone | 19.00 inches (483 mm) | Agnes (1972) | Western Schuylkill County |
Climate Information for Major Cities
To give you an idea of how different the climate can be, here are some weather details for a few major cities in Pennsylvania:
| Climate data for Allentown, Pennsylvania (Lehigh Valley Int'l), 1981–2010 normals, extremes 1922–present | |||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Month | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Year |
| Record high °F (°C) | 72 (22) |
77 (25) |
87 (31) |
93 (34) |
97 (36) |
100 (38) |
105 (41) |
100 (38) |
99 (37) |
92 (33) |
81 (27) |
72 (22) |
105 (41) |
| Mean maximum °F (°C) | 57.9 (14.4) |
59.6 (15.3) |
71.6 (22.0) |
82.5 (28.1) |
88.2 (31.2) |
91.9 (33.3) |
94.2 (34.6) |
92.5 (33.6) |
88.0 (31.1) |
79.0 (26.1) |
70.6 (21.4) |
59.7 (15.4) |
95.4 (35.2) |
| Mean daily maximum °F (°C) | 36.0 (2.2) |
39.8 (4.3) |
49.4 (9.7) |
61.3 (16.3) |
71.5 (21.9) |
80.1 (26.7) |
84.2 (29.0) |
82.4 (28.0) |
74.9 (23.8) |
63.6 (17.6) |
52.5 (11.4) |
40.5 (4.7) |
61.4 (16.3) |
| Mean daily minimum °F (°C) | 19.5 (−6.9) |
21.7 (−5.7) |
28.8 (−1.8) |
38.5 (3.6) |
48.3 (9.1) |
58.1 (14.5) |
62.7 (17.1) |
60.9 (16.1) |
52.9 (11.6) |
41.3 (5.2) |
32.9 (0.5) |
24.0 (−4.4) |
40.8 (4.9) |
| Mean minimum °F (°C) | 3.0 (−16.1) |
5.7 (−14.6) |
13.1 (−10.5) |
26.0 (−3.3) |
35.5 (1.9) |
46.3 (7.9) |
52.6 (11.4) |
49.8 (9.9) |
39.2 (4.0) |
28.8 (−1.8) |
19.9 (−6.7) |
9.1 (−12.7) |
0.2 (−17.7) |
| Record low °F (°C) | −15 (−26) |
−12 (−24) |
−5 (−21) |
12 (−11) |
28 (−2) |
39 (4) |
46 (8) |
41 (5) |
30 (−1) |
21 (−6) |
3 (−16) |
−8 (−22) |
−15 (−26) |
| Average precipitation inches (mm) | 3.03 (77) |
2.70 (69) |
3.39 (86) |
3.56 (90) |
4.14 (105) |
4.31 (109) |
4.95 (126) |
3.69 (94) |
4.62 (117) |
3.88 (99) |
3.50 (89) |
3.58 (91) |
45.35 (1,152) |
| Average snowfall inches (cm) | 10.0 (25) |
11.1 (28) |
4.9 (12) |
1.0 (2.5) |
0 (0) |
0 (0) |
0 (0) |
0 (0) |
0 (0) |
0 (0) |
0.7 (1.8) |
5.2 (13) |
32.9 (84) |
| Average precipitation days (≥ 0.01 in) | 11.1 | 9.8 | 11.0 | 12.1 | 12.1 | 11.4 | 10.9 | 9.5 | 9.1 | 9.1 | 9.8 | 10.9 | 126.8 |
| Average snowy days (≥ 0.1 in) | 5.6 | 4.8 | 2.5 | 0.4 | 0 | 0 | 0 | 0 | 0 | 0 | 0.6 | 3.5 | 17.4 |
| Average relative humidity (%) | 69.1 | 66.7 | 62.6 | 60.9 | 65.6 | 67.9 | 68.8 | 71.9 | 74.0 | 71.8 | 70.5 | 71.4 | 68.4 |
| Source: NOAA (relative humidity 1961–1990) | |||||||||||||
| Climate data for Erie, Pennsylvania (Erie International Airport), 1991–2020 normals, extremes 1873–present | |||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Month | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Year |
| Record high °F (°C) | 73 (23) |
77 (25) |
82 (28) |
89 (32) |
91 (33) |
100 (38) |
99 (37) |
96 (36) |
99 (37) |
89 (32) |
82 (28) |
75 (24) |
100 (38) |
| Mean maximum °F (°C) | 59 (15) |
59 (15) |
69 (21) |
80 (27) |
85 (29) |
90 (32) |
91 (33) |
90 (32) |
87 (31) |
79 (26) |
68 (20) |
60 (16) |
92 (33) |
| Mean daily maximum °F (°C) | 35.2 (1.8) |
36.5 (2.5) |
44.3 (6.8) |
56.8 (13.8) |
68.3 (20.2) |
77.1 (25.1) |
81.1 (27.3) |
79.9 (26.6) |
73.7 (23.2) |
62.3 (16.8) |
50.5 (10.3) |
40.2 (4.6) |
58.8 (14.9) |
| Daily mean °F (°C) | 28.2 (−2.1) |
28.9 (−1.7) |
36.1 (2.3) |
47.4 (8.6) |
58.8 (14.9) |
68.2 (20.1) |
72.7 (22.6) |
71.5 (21.9) |
65.2 (18.4) |
54.3 (12.4) |
43.6 (6.4) |
34.1 (1.2) |
50.8 (10.4) |
| Mean daily minimum °F (°C) | 21.3 (−5.9) |
21.4 (−5.9) |
27.9 (−2.3) |
38.0 (3.3) |
49.3 (9.6) |
59.4 (15.2) |
64.2 (17.9) |
63.2 (17.3) |
56.7 (13.7) |
46.3 (7.9) |
36.7 (2.6) |
28.0 (−2.2) |
42.7 (5.9) |
| Mean minimum °F (°C) | 4 (−16) |
4 (−16) |
11 (−12) |
26 (−3) |
35 (2) |
46 (8) |
54 (12) |
53 (12) |
44 (7) |
34 (1) |
24 (−4) |
13 (−11) |
0 (−18) |
| Record low °F (°C) | −18 (−28) |
−18 (−28) |
−9 (−23) |
7 (−14) |
26 (−3) |
32 (0) |
44 (7) |
37 (3) |
33 (1) |
23 (−5) |
6 (−14) |
−11 (−24) |
−18 (−28) |
| Average precipitation inches (mm) | 3.41 (87) |
2.52 (64) |
3.08 (78) |
3.47 (88) |
3.50 (89) |
3.70 (94) |
3.33 (85) |
3.35 (85) |
4.32 (110) |
4.38 (111) |
3.75 (95) |
4.17 (106) |
42.98 (1,092) |
| Average snowfall inches (cm) | 31.8 (81) |
19.4 (49) |
14.5 (37) |
2.6 (6.6) |
0.0 (0.0) |
0.0 (0.0) |
0.0 (0.0) |
0.0 (0.0) |
0.0 (0.0) |
0.1 (0.25) |
9.6 (24) |
26.3 (67) |
104.3 (265) |
| Average precipitation days (≥ 0.01 in) | 19.7 | 15.4 | 14.3 | 14.0 | 13.5 | 11.5 | 10.5 | 10.2 | 10.1 | 14.3 | 14.9 | 18.5 | 166.9 |
| Average snowy days (≥ 0.1 in) | 16.3 | 12.3 | 7.8 | 2.3 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.2 | 4.8 | 11.5 | 55.2 |
| Average relative humidity (%) | 74.5 | 75.4 | 71.9 | 67.9 | 68.9 | 71.3 | 71.7 | 74.0 | 74.5 | 71.1 | 72.3 | 75.0 | 72.4 |
| Source: NOAA (relative humidity 1961–1990) | |||||||||||||
| Climate data for Harrisburg, Pennsylvania (Harrisburg Int'l), 1981–2010 normals, extremes 1888–present | |||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Month | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Year |
| Record high °F (°C) | 73 (23) |
78 (26) |
87 (31) |
93 (34) |
97 (36) |
100 (38) |
107 (42) |
104 (40) |
102 (39) |
97 (36) |
84 (29) |
75 (24) |
107 (42) |
| Mean daily maximum °F (°C) | 37.0 (2.8) |
40.7 (4.8) |
50.4 (10.2) |
62.4 (16.9) |
72.1 (22.3) |
81.0 (27.2) |
85.5 (29.7) |
83.4 (28.6) |
75.6 (24.2) |
64.1 (17.8) |
53.1 (11.7) |
41.3 (5.2) |
62.2 (16.8) |
| Mean daily minimum °F (°C) | 22.8 (−5.1) |
25.1 (−3.8) |
33.0 (0.6) |
41.9 (5.5) |
52.1 (11.2) |
62.0 (16.7) |
66.3 (19.1) |
64.5 (18.1) |
56.2 (13.4) |
44.6 (7.0) |
35.1 (1.7) |
26.6 (−3.0) |
44.2 (6.8) |
| Record low °F (°C) | −22 (−30) |
−13 (−25) |
−1 (−18) |
11 (−12) |
31 (−1) |
40 (4) |
49 (9) |
45 (7) |
30 (−1) |
23 (−5) |
10 (−12) |
−8 (−22) |
−22 (−30) |
| Average precipitation inches (mm) | 2.88 (73) |
2.39 (61) |
3.37 (86) |
3.10 (79) |
3.79 (96) |
3.60 (91) |
4.61 (117) |
3.20 (81) |
4.07 (103) |
3.27 (83) |
3.23 (82) |
3.23 (82) |
40.74 (1,035) |
| Average snowfall inches (cm) | 8.8 (22) |
10.5 (27) |
5.2 (13) |
0.4 (1.0) |
0 (0) |
0 (0) |
0 (0) |
0 (0) |
0 (0) |
0 (0) |
0.6 (1.5) |
5.1 (13) |
30.6 (78) |
| Average precipitation days (≥ 0.01 in) | 10.6 | 9.9 | 10.9 | 10.8 | 12.2 | 11.1 | 10.7 | 9.1 | 9.2 | 8.8 | 9.0 | 9.7 | 122.0 |
| Average snowy days (≥ 0.1 in) | 5.2 | 5.0 | 2.6 | 0.3 | 0 | 0 | 0 | 0 | 0 | 0 | 0.9 | 2.8 | 16.8 |
| Average relative humidity (%) | 64.4 | 63.2 | 60.7 | 59.2 | 65.2 | 67.7 | 68.6 | 72.2 | 73.8 | 70.5 | 68.2 | 66.4 | 66.7 |
| Mean monthly sunshine hours | 154.9 | 167.2 | 213.8 | 235.7 | 266.7 | 288.5 | 310.1 | 285.4 | 226.7 | 199.2 | 139.6 | 126.0 | 2,613.8 |
| Percent possible sunshine | 52 | 56 | 58 | 59 | 60 | 64 | 68 | 67 | 61 | 58 | 47 | 43 | 59 |
| Source: NOAA (relative humidity and sun 1961–1990 at Capital City Airport) | |||||||||||||
| Climate data for Philadelphia (Philadelphia Airport), 1981–2010 normals, extremes 1872–present | |||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Month | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Year |
| Record high °F (°C) | 74 (23) |
79 (26) |
87 (31) |
95 (35) |
97 (36) |
102 (39) |
104 (40) |
106 (41) |
102 (39) |
96 (36) |
84 (29) |
73 (23) |
106 (41) |
| Mean maximum °F (°C) | 62.0 (16.7) |
62.7 (17.1) |
73.6 (23.1) |
83.2 (28.4) |
89.1 (31.7) |
94.2 (34.6) |
96.4 (35.8) |
94.7 (34.8) |
89.8 (32.1) |
81.7 (27.6) |
72.3 (22.4) |
63.5 (17.5) |
97.5 (36.4) |
| Mean daily maximum °F (°C) | 40.3 (4.6) |
43.8 (6.6) |
52.7 (11.5) |
63.9 (17.7) |
73.8 (23.2) |
82.7 (28.2) |
87.1 (30.6) |
85.3 (29.6) |
78.0 (25.6) |
66.6 (19.2) |
56.0 (13.3) |
44.8 (7.1) |
64.6 (18.1) |
| Daily mean °F (°C) | 33.0 (0.6) |
35.7 (2.1) |
43.5 (6.4) |
54.0 (12.2) |
63.9 (17.7) |
73.3 (22.9) |
78.1 (25.6) |
76.6 (24.8) |
69.1 (20.6) |
57.5 (14.2) |
47.6 (8.7) |
37.5 (3.1) |
55.9 (13.3) |
| Mean daily minimum °F (°C) | 25.6 (−3.6) |
27.7 (−2.4) |
34.4 (1.3) |
44.1 (6.7) |
54.0 (12.2) |
63.8 (17.7) |
69.2 (20.7) |
67.9 (19.9) |
60.3 (15.7) |
48.4 (9.1) |
39.2 (4.0) |
30.1 (−1.1) |
47.1 (8.4) |
| Mean minimum °F (°C) | 8.7 (−12.9) |
12.7 (−10.7) |
19.4 (−7.0) |
31.6 (−0.2) |
42.0 (5.6) |
52.2 (11.2) |
59.8 (15.4) |
57.8 (14.3) |
47.2 (8.4) |
35.8 (2.1) |
26.0 (−3.3) |
15.8 (−9.0) |
6.4 (−14.2) |
| Record low °F (°C) | −7 (−22) |
−11 (−24) |
5 (−15) |
14 (−10) |
28 (−2) |
44 (7) |
51 (11) |
44 (7) |
35 (2) |
25 (−4) |
8 (−13) |
−5 (−21) |
−11 (−24) |
| Average precipitation inches (mm) | 3.03 (77) |
2.65 (67) |
3.79 (96) |
3.56 (90) |
3.71 (94) |
3.43 (87) |
4.35 (110) |
3.50 (89) |
3.78 (96) |
3.18 (81) |
2.99 (76) |
3.56 (90) |
41.53 (1,055) |
| Average snowfall inches (cm) | 6.5 (17) |
8.8 (22) |
2.9 (7.4) |
0.5 (1.3) |
0 (0) |
0 (0) |
0 (0) |
0 (0) |
0 (0) |
0 (0) |
0.3 (0.76) |
3.4 (8.6) |
22.4 (57) |
| Average precipitation days (≥ 0.01 in) | 10.6 | 9.4 | 10.5 | 11.3 | 11.1 | 9.8 | 9.9 | 8.4 | 8.7 | 8.6 | 9.3 | 10.6 | 118.2 |
| Average snowy days (≥ 0.1 in) | 4.4 | 3.6 | 1.8 | 0.4 | 0 | 0 | 0 | 0 | 0 | 0 | 0.2 | 1.8 | 12.2 |
| Average relative humidity (%) | 66.2 | 63.6 | 61.7 | 60.4 | 65.4 | 67.8 | 69.6 | 70.4 | 71.6 | 70.8 | 68.4 | 67.7 | 67.0 |
| Mean monthly sunshine hours | 155.7 | 154.7 | 202.8 | 217.0 | 245.1 | 271.2 | 275.6 | 260.1 | 219.3 | 204.5 | 154.7 | 137.7 | 2,498.4 |
| Percent possible sunshine | 52 | 52 | 55 | 55 | 55 | 61 | 61 | 61 | 59 | 59 | 52 | 47 | 56 |
| Source: NOAA (relative humidity and sun 1961–1990) | |||||||||||||
| Climate data for Pittsburgh (Pittsburgh International Airport), 1981–2010 normals, extremes 1871–present | |||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Month | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Year |
| Record high °F (°C) | 75 (24) |
77 (25) |
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) | 59.7 (15.4) |
61.9 (16.6) |
74.9 (23.8) |
81.5 (27.5) |
85.7 (29.8) |
90.0 (32.2) |
91.3 (32.9) |
90.5 (32.5) |
87.2 (30.7) |
79.0 (26.1) |
71.5 (21.9) |
61.3 (16.3) |
92.7 (33.7) |
| Mean daily maximum °F (°C) | 35.7 (2.1) |
39.3 (4.1) |
49.2 (9.6) |
61.7 (16.5) |
70.8 (21.6) |
79.1 (26.2) |
82.5 (28.1) |
81.4 (27.4) |
74.3 (23.5) |
62.6 (17.0) |
51.2 (10.7) |
39.4 (4.1) |
60.6 (15.9) |
| Mean daily minimum °F (°C) | 21.1 (−6.1) |
23.0 (−5.0) |
30.0 (−1.1) |
40.2 (4.6) |
49.3 (9.6) |
58.4 (14.7) |
62.8 (17.1) |
61.5 (16.4) |
54.0 (12.2) |
42.9 (6.1) |
34.7 (1.5) |
25.3 (−3.7) |
41.9 (5.5) |
| Mean minimum °F (°C) | −0.1 (−17.8) |
3.6 (−15.8) |
10.9 (−11.7) |
24.6 (−4.1) |
34.8 (1.6) |
44.1 (6.7) |
50.7 (10.4) |
49.6 (9.8) |
39.3 (4.1) |
29.0 (−1.7) |
18.9 (−7.3) |
6.7 (−14.1) |
−3.9 (−19.9) |
| 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) | 2.70 (69) |
2.39 (61) |
2.95 (75) |
3.11 (79) |
3.95 (100) |
4.30 (109) |
3.83 (97) |
3.48 (88) |
3.11 (79) |
2.29 (58) |
3.23 (82) |
2.85 (72) |
38.19 (970) |
| Average snowfall inches (cm) | 11.5 (29) |
10.2 (26) |
7.4 (19) |
1.5 (3.8) |
0 (0) |
0 (0) |
0 (0) |
0 (0) |
0 (0) |
0.4 (1.0) |
2.1 (5.3) |
8.3 (21) |
41.4 (105) |
| Average precipitation days (≥ 0.01 in) | 16.2 | 13.6 | 14.0 | 13.8 | 13.3 | 12.1 | 10.2 | 9.8 | 9.8 | 10.5 | 12.8 | 15.1 | 151.2 |
| Average snowy days (≥ 0.1 in) | 11.4 | 8.3 | 5.9 | 2.0 | 0 | 0 | 0 | 0 | 0 | 0.3 | 3.0 | 8.5 | 39.4 |
| 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 |
| 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 |
| Source: NOAA (relative humidity and sun 1961–1990) | |||||||||||||
| Climate data for Wilkes-Barre/Scranton Int'l Airport, Pennsylvania (1981–2010 normals, extremes 1901–present ) | |||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Month | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Year |
| Record high °F (°C) | 69 (21) |
76 (24) |
85 (29) |
93 (34) |
93 (34) |
99 (37) |
103 (39) |
102 (39) |
100 (38) |
91 (33) |
81 (27) |
71 (22) |
103 (39) |
| Mean maximum °F (°C) | 55.4 (13.0) |
56.4 (13.6) |
69.6 (20.9) |
81.3 (27.4) |
86.6 (30.3) |
89.8 (32.1) |
91.8 (33.2) |
90.0 (32.2) |
85.7 (29.8) |
77.3 (25.2) |
68.7 (20.4) |
57.5 (14.2) |
93.4 (34.1) |
| Mean daily maximum °F (°C) | 33.2 (0.7) |
36.8 (2.7) |
46.2 (7.9) |
59.1 (15.1) |
69.7 (20.9) |
77.7 (25.4) |
81.9 (27.7) |
79.9 (26.6) |
72.3 (22.4) |
60.7 (15.9) |
49.4 (9.7) |
37.5 (3.1) |
58.8 (14.9) |
| Mean daily minimum °F (°C) | 18.5 (−7.5) |
20.7 (−6.3) |
27.6 (−2.4) |
38.2 (3.4) |
47.6 (8.7) |
56.5 (13.6) |
60.9 (16.1) |
59.5 (15.3) |
52.1 (11.2) |
41.1 (5.1) |
33.3 (0.7) |
23.8 (−4.6) |
40.1 (4.5) |
| Mean minimum °F (°C) | −0.8 (−18.2) |
3.2 (−16.0) |
9.1 (−12.7) |
24.0 (−4.4) |
34.4 (1.3) |
43.1 (6.2) |
49.4 (9.7) |
47.1 (8.4) |
37.5 (3.1) |
28.3 (−2.1) |
18.9 (−7.3) |
5.9 (−14.5) |
−3.1 (−19.5) |
| Record low °F (°C) | −21 (−29) |
−19 (−28) |
−4 (−20) |
8 (−13) |
27 (−3) |
34 (1) |
43 (6) |
38 (3) |
29 (−2) |
19 (−7) |
6 (−14) |
−13 (−25) |
−21 (−29) |
| Average precipitation inches (mm) | 2.37 (60) |
2.03 (52) |
2.55 (65) |
3.33 (85) |
3.52 (89) |
4.03 (102) |
3.79 (96) |
3.41 (87) |
4.07 (103) |
3.34 (85) |
3.14 (80) |
2.68 (68) |
38.26 (972) |
| Average snowfall inches (cm) | 14.2 (36) |
9.3 (24) |
9.0 (23) |
3.3 (8.4) |
0 (0) |
0 (0) |
0 (0) |
0 (0) |
0 (0) |
0.1 (0.25) |
2.9 (7.4) |
7.4 (19) |
46.2 (117) |
| Average precipitation days (≥ 0.01 in) | 12.0 | 11.0 | 11.8 | 12.3 | 13.2 | 12.8 | 11.2 | 11.3 | 10.2 | 10.7 | 11.2 | 11.5 | 139.2 |
| Average snowy days (≥ 0.1 in) | 9.3 | 7.7 | 5.0 | 1.7 | 0 | 0 | 0 | 0 | 0 | 0.1 | 2.1 | 7.1 | 33.0 |
| Average relative humidity (%) | 70.1 | 67.5 | 63.3 | 60.4 | 64.6 | 70.5 | 71.1 | 73.8 | 75.2 | 71.6 | 71.8 | 72.5 | 69.4 |
| Mean monthly sunshine hours | 130.3 | 143.7 | 185.7 | 210.5 | 246.9 | 269.7 | 285.7 | 257.2 | 200.2 | 173.3 | 104.3 | 95.9 | 2,303.4 |
| Percent possible sunshine | 44 | 48 | 50 | 53 | 55 | 60 | 62 | 60 | 54 | 50 | 35 | 33 | 52 |
| Source: NOAA (relative humidity 1964–1990, sun 1961–1990) | |||||||||||||
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Climate of Pennsylvania Facts for Kids. Kiddle Encyclopedia.