| Climate data for Trenton, New Jersey (Trenton–Mercer Airport) 1991–2020 normals, extremes 1865–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) |
99 (37) |
100 (38) |
106 (41) |
105 (41) |
101 (38) |
94 (34) |
83 (28) |
76 (24) |
106 (41) |
| Mean maximum °F (°C) | 62.7 (17.1) |
62.7 (17.1) |
74.2 (23.4) |
83.0 (28.3) |
88.6 (31.4) |
93.4 (34.1) |
96.3 (35.7) |
94.3 (34.6) |
89.7 (32.1) |
81.4 (27.4) |
72.0 (22.2) |
64.2 (17.9) |
97.2 (36.2) |
| Mean daily maximum °F (°C) | 39.7 (4.3) |
42.8 (6.0) |
50.8 (10.4) |
62.9 (17.2) |
72.4 (22.4) |
81.0 (27.2) |
86.0 (30.0) |
84.0 (28.9) |
77.1 (25.1) |
65.5 (18.6) |
54.5 (12.5) |
44.4 (6.9) |
63.4 (17.4) |
| Daily mean °F (°C) | 32.0 (0.0) |
34.3 (1.3) |
41.7 (5.4) |
52.5 (11.4) |
62.0 (16.7) |
71.0 (21.7) |
76.3 (24.6) |
74.4 (23.6) |
67.4 (19.7) |
55.7 (13.2) |
45.4 (7.4) |
36.8 (2.7) |
54.1 (12.3) |
| Mean daily minimum °F (°C) | 24.3 (−4.3) |
25.9 (−3.4) |
32.7 (0.4) |
42.1 (5.6) |
51.6 (10.9) |
60.9 (16.1) |
66.6 (19.2) |
64.8 (18.2) |
57.7 (14.3) |
45.9 (7.7) |
36.3 (2.4) |
29.3 (−1.5) |
44.8 (7.1) |
| Mean minimum °F (°C) | 7.2 (−13.8) |
10.0 (−12.2) |
17.9 (−7.8) |
29.0 (−1.7) |
37.7 (3.2) |
48.3 (9.1) |
57.0 (13.9) |
54.4 (12.4) |
43.2 (6.2) |
31.6 (−0.2) |
21.8 (−5.7) |
14.8 (−9.6) |
5.1 (−14.9) |
| Record low °F (°C) | −16 (−27) |
−14 (−26) |
0 (−18) |
11 (−12) |
31 (−1) |
39 (4) |
46 (8) |
39 (4) |
34 (1) |
21 (−6) |
9 (−13) |
−8 (−22) |
−16 (−27) |
| Average precipitation inches (mm) | 3.29 (84) |
2.63 (67) |
3.97 (101) |
3.63 (92) |
3.99 (101) |
4.25 (108) |
4.39 (112) |
4.22 (107) |
4.09 (104) |
3.79 (96) |
3.18 (81) |
4.04 (103) |
45.47 (1,155) |
| Average snowfall inches (cm) | 7.9 (20) |
8.6 (22) |
4.9 (12) |
0.5 (1.3) |
0.0 (0.0) |
0.0 (0.0) |
0.0 (0.0) |
0.0 (0.0) |
0.0 (0.0) |
0.1 (0.25) |
0.5 (1.3) |
4.3 (11) |
26.8 (67.85) |
| Average precipitation days (≥ 0.01 in) | 10.1 | 10.1 | 11.0 | 11.5 | 12.0 | 11.9 | 10.8 | 10.0 | 8.6 | 10.0 | 8.5 | 11.0 | 125.5 |
| Average snowy days (≥ 0.1 in) | 4.6 | 4.3 | 2.6 | 0.3 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.3 | 2.3 | 14.4 |
| Average relative humidity (%) | 65.4 | 61.7 | 58.0 | 57.0 | 62.1 | 66.1 | 66.2 | 68.8 | 69.8 | 68.8 | 66.9 | 66.5 | 64.8 |
| Average dew point °F (°C) | 21.7 (−5.7) |
22.8 (−5.1) |
28.1 (−2.2) |
37.7 (3.2) |
48.7 (9.3) |
59.4 (15.2) |
63.9 (17.7) |
63.5 (17.5) |
57.0 (13.9) |
45.6 (7.6) |
35.9 (2.2) |
26.5 (−3.1) |
42.7 (5.9) |
| Mean monthly sunshine hours | 163.1 | 169.7 | 207.4 | 227.2 | 248.1 | 262.8 | 269.2 | 252.5 | 215.0 | 201.5 | 149.3 | 140.1 | 2,505.9 |
| Percent possible sunshine | 54 | 57 | 56 | 57 | 56 | 58 | 59 | 59 | 57 | 58 | 50 | 48 | 56 |
| Source 1: NOAA (sun 1961–1981)[1][2][3] | |||||||||||||
| Source 2: PRISM Climate Group (humidity and dew point)[4] | |||||||||||||
- ^ "NowData – NOAA Online Weather Data". National Oceanic and Atmospheric Administration. Retrieved August 12, 2021.
- ^ "Station: Trenton Mercer CO AP, NJ". U.S. Climate Normals 2020: U.S. Monthly Climate Normals (1991–2020). National Oceanic and Atmospheric Administration. Retrieved August 12, 2021.
- ^ "WMO Climate Normals for Trenton/WSO City, NJ 1961–1990". NOAA. Retrieved August 12, 2021.
- ^ "PRISM Climate Group, Oregon State University". www.prism.oregonstate.edu. Retrieved July 31, 2019.