Climate data for Erie, Pennsylvania (Erie International Airport), 1981–2010 normals, extremes 1873–present Month Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Year Record high °F (°C) 73 (23) 75 (24) 82 (28) 89 (32) 91 (33) 100 (38) 99 (37) 96 (36) 99 (37) 89 (32) 82 (28) 75 (24) 100 (38) Average high °F (°C) 33.7 (0.9) 35.5 (1.9) 43.8 (6.6) 56.1 (13.4) 66.6 (19.2) 75.7 (24.3) 79.8 (26.6) 78.6 (25.9) 71.9 (22.2) 60.8 (16) 49.9 (9.9) 38.1 (3.4) 57.7 (14.3) Daily mean °F (°C) 27.2 (−2.7) 28.3 (−2.1) 35.7 (2.1) 47.1 (8.4) 57.4 (14.1) 67.1 (19.5) 71.7 (22.1) 70.5 (21.4) 63.8 (17.7) 53.0 (11.7) 43.3 (6.3) 32.4 (0.2) 49.9 (9.9) Average low °F (°C) 20.8 (−6.2) 21.1 (−6.1) 27.5 (−2.5) 38.1 (3.4) 48.2 (9) 58.4 (14.7) 63.5 (17.5) 62.5 (16.9) 55.8 (13.2) 45.3 (7.4) 36.6 (2.6) 26.6 (−3) 42.1 (5.6) 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) 2.95 (74.9) 2.39 (60.7) 2.95 (74.9) 3.33 (84.6) 3.44 (87.4) 3.76 (95.5) 3.54 (89.9) 3.47 (88.1) 4.61 (117.1) 4.05 (102.9) 3.93 (99.8) 3.74 (95) 42.16 (1,070.9) Average snowfall inches (cm) 29.6 (75.2) 18.2 (46.2) 13.7 (34.8) 3.2 (8.1) Trace 0.0 (0) 0.0 (0) 0.0 (0) 0.0 (0) 0.2 (0.5) 8.5 (21.6) 27.5 (69.9) 100.9 (256.3) Average precipitation days (≥ 0.01 in) 19.6 15.0 14.3 13.9 12.8 11.1 10.2 10.3 11.1 13.4 15.5 19.2 166.4 Average snowy days (≥ 0.1 in) 16.5 11.7 8.0 2.7 0.0 0.0 0.0 0.0 0.0 0.2 4.4 13.6 57.1 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)[38][40][41]