| Climate data for Rochester, New York (Greater Rochester Int'l), 1991–2020 normals,[a] extremes 1871−present[b] | |||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Month | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Year |
| Record high °F (°C) | 74 (23) |
73 (23) |
86 (30) |
93 (34) |
94 (34) |
100 (38) |
102 (39) |
99 (37) |
99 (37) |
91 (33) |
81 (27) |
72 (22) |
102 (39) |
| Mean maximum °F (°C) | 57.2 (14.0) |
55.1 (12.8) |
67.1 (19.5) |
79.9 (26.6) |
86.7 (30.4) |
90.5 (32.5) |
92.1 (33.4) |
90.4 (32.4) |
87.7 (30.9) |
80.0 (26.7) |
68.5 (20.3) |
57.5 (14.2) |
93.4 (34.1) |
| Mean daily maximum °F (°C) | 33.4 (0.8) |
35.2 (1.8) |
43.6 (6.4) |
55.5 (13.1) |
69.4 (20.8) |
77.9 (25.5) |
82.5 (28.1) |
80.5 (26.9) |
73.6 (23.1) |
61.2 (16.2) |
49.1 (9.5) |
38.5 (3.6) |
58.5 (14.7) |
| Daily mean °F (°C) | 26.2 (−3.2) |
27.4 (−2.6) |
35.2 (1.8) |
46.8 (8.2) |
58.8 (14.9) |
67.6 (19.8) |
72.3 (22.4) |
70.7 (21.5) |
63.6 (17.6) |
52.2 (11.2) |
41.5 (5.3) |
32.0 (0.0) |
49.5 (9.7) |
| Mean daily minimum °F (°C) | 19.0 (−7.2) |
19.6 (−6.9) |
26.8 (−2.9) |
37.1 (2.8) |
48.2 (9.0) |
57.4 (14.1) |
62.2 (16.8) |
61.0 (16.1) |
53.6 (12.0) |
43.3 (6.3) |
34.0 (1.1) |
25.4 (−3.7) |
40.6 (4.8) |
| Mean minimum °F (°C) | −0.8 (−18.2) |
0.5 (−17.5) |
8.4 (−13.1) |
24.1 (−4.4) |
34.4 (1.3) |
43.9 (6.6) |
50.7 (10.4) |
49.2 (9.6) |
39.6 (4.2) |
29.7 (−1.3) |
18.6 (−7.4) |
7.7 (−13.5) |
−3.7 (−19.8) |
| Record low °F (°C) | −17 (−27) |
−22 (−30) |
−9 (−23) |
7 (−14) |
26 (−3) |
35 (2) |
42 (6) |
36 (2) |
28 (−2) |
19 (−7) |
1 (−17) |
−16 (−27) |
−22 (−30) |
| Average precipitation inches (mm) | 2.55 (65) |
2.13 (54) |
2.49 (63) |
2.99 (76) |
2.86 (73) |
3.37 (86) |
3.56 (90) |
3.31 (84) |
3.18 (81) |
3.22 (82) |
2.76 (70) |
2.67 (68) |
35.09 (891) |
| Average snowfall inches (cm) | 27.4 (70) |
23.1 (59) |
17.9 (45) |
3.0 (7.6) |
0.1 (0.25) |
0.0 (0.0) |
0.0 (0.0) |
0.0 (0.0) |
0.0 (0.0) |
0.1 (0.25) |
8.1 (21) |
22.3 (57) |
102.0 (259) |
| Average precipitation days (≥ 0.01 in) | 19.6 | 16.4 | 15.4 | 13.4 | 12.4 | 11.5 | 11.2 | 10.3 | 11.1 | 13.9 | 14.9 | 18.1 | 168.2 |
| Average snowy days (≥ 0.1 in) | 17.6 | 15.0 | 10.1 | 3.0 | 0.1 | 0.0 | 0.0 | 0.0 | 0.0 | 0.2 | 5.7 | 13.5 | 65.2 |
| Average relative humidity (%) | 74.0 | 74.1 | 71.0 | 67.0 | 67.2 | 69.4 | 69.7 | 74.3 | 76.8 | 74.5 | 76.3 | 77.5 | 72.6 |
| Average dew point °F (°C) | 16.3 (−8.7) |
17.2 (−8.2) |
25.0 (−3.9) |
34.0 (1.1) |
45.1 (7.3) |
55.0 (12.8) |
59.9 (15.5) |
59.7 (15.4) |
53.4 (11.9) |
42.3 (5.7) |
33.3 (0.7) |
22.8 (−5.1) |
38.7 (3.7) |
| Mean monthly sunshine hours | 108.3 | 118.1 | 177.7 | 216.5 | 266.5 | 297.6 | 314.4 | 273.4 | 212.3 | 154.4 | 81.5 | 77.5 | 2,298.2 |
| Percent possible sunshine | 37 | 40 | 48 | 54 | 59 | 65 | 68 | 63 | 57 | 45 | 28 | 28 | 52 |
| Source: NOAA (relative humidity, dew point, and sun 1961–1990)[1][2][3] | |||||||||||||
- ^ Mean monthly maxima and minima (i.e. the expected highest and lowest temperature readings at any point during the year or given month) calculated based on data at said location from 1991 to 2020.
- ^ Official records for Rochester kept January 1871 to September 1940 at downtown and at Greater Rochester Int'l since October 1940. For more information, see Threadex
- ^ "NowData – NOAA Online Weather Data". National Oceanic and Atmospheric Administration. Retrieved May 4, 2021.
- ^ "Summary of Monthly Normals 1991–2020". National Oceanic and Atmospheric Administration. Archived from the original on May 5, 2021. Retrieved May 4, 2021.
- ^ "WMO Climate Normals for ROCHESTER/ROCHESTER-MONROE CO,NY 1961–1990". National Oceanic and Atmospheric Administration. Retrieved July 28, 2020.