| Month | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Year |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Record high °F (°C) | 88 (31) |
91 (33) |
99 (37) |
98 (37) |
98 (37) |
101 (38) |
100 (38) |
98 (37) |
111 (44) |
107 (42) |
100 (38) |
88 (31) |
111 (44) |
| Mean maximum °F (°C) | 78.8 (26.0) |
78.6 (25.9) |
80.2 (26.8) |
82.1 (27.8) |
79.3 (26.3) |
79.6 (26.4) |
82.9 (28.3) |
85.2 (29.6) |
90.6 (32.6) |
87.8 (31.0) |
85.4 (29.7) |
77.0 (25.0) |
94.0 (34.4) |
| Mean daily maximum °F (°C) | 66.4 (19.1) |
66.2 (19.0) |
67.0 (19.4) |
68.8 (20.4) |
69.5 (20.8) |
71.7 (22.1) |
75.3 (24.1) |
77.3 (25.2) |
77.2 (25.1) |
74.6 (23.7) |
70.7 (21.5) |
66.0 (18.9) |
70.9 (21.6) |
| Daily mean °F (°C) | 58.4 (14.7) |
59.0 (15.0) |
60.7 (15.9) |
62.9 (17.2) |
64.8 (18.2) |
67.2 (19.6) |
70.7 (21.5) |
72.4 (22.4) |
71.7 (22.1) |
68.1 (20.1) |
62.7 (17.1) |
57.9 (14.4) |
64.7 (18.2) |
| Mean daily minimum °F (°C) | 50.3 (10.2) |
51.8 (11.0) |
54.5 (12.5) |
57.1 (13.9) |
60.0 (15.6) |
62.6 (17.0) |
66.1 (18.9) |
67.5 (19.7) |
66.2 (19.0) |
61.5 (16.4) |
54.8 (12.7) |
49.8 (9.9) |
58.5 (14.7) |
| Mean minimum °F (°C) | 43.7 (6.5) |
46.1 (7.8) |
48.7 (9.3) |
51.9 (11.1) |
55.8 (13.2) |
59.3 (15.2) |
63.0 (17.2) |
63.9 (17.7) |
61.8 (16.6) |
55.5 (13.1) |
48.2 (9.0) |
43.0 (6.1) |
42.6 (5.9) |
| Record low °F (°C) | 25 (−4) |
34 (1) |
36 (2) |
39 (4) |
45 (7) |
50 (10) |
54 (12) |
54 (12) |
50 (10) |
43 (6) |
36 (2) |
32 (0) |
25 (−4) |
| Average precipitation inches (mm) | 1.98 (50) |
2.20 (56) |
1.46 (37) |
0.65 (17) |
0.28 (7.1) |
0.05 (1.3) |
0.08 (2.0) |
0.01 (0.25) |
0.12 (3.0) |
0.50 (13) |
0.79 (20) |
1.67 (42) |
9.79 (249) |
| Average precipitation days (≥ 0.01 in) | 6.5 | 7.1 | 6.2 | 3.8 | 2.2 | 0.7 | 0.7 | 0.3 | 0.9 | 2.4 | 3.7 | 5.8 | 40.3 |
| Average relative humidity (%) | 63.1 | 65.7 | 67.3 | 67.0 | 70.6 | 74.0 | 74.6 | 74.1 | 72.7 | 69.4 | 66.3 | 63.7 | 69.0 |
| Average dew point °F (°C) | 42.8 (6.0) |
45.3 (7.4) |
47.3 (8.5) |
49.5 (9.7) |
53.1 (11.7) |
57.0 (13.9) |
61.2 (16.2) |
62.4 (16.9) |
60.6 (15.9) |
55.6 (13.1) |
48.6 (9.2) |
43.2 (6.2) |
52.2 (11.2) |
| Mean monthly sunshine hours | 239.3 | 227.4 | 261.0 | 276.2 | 250.5 | 242.4 | 304.7 | 295.0 | 253.3 | 243.4 | 230.1 | 231.3 | 3,054.6 |
| Percent possible sunshine | 75 | 74 | 70 | 71 | 58 | 57 | 70 | 71 | 68 | 69 | 73 | 74 | 69 |
| Source: NOAA (sun, relative humidity, and dew point 1961–1990)[2][3][4] | |||||||||||||
Notes
edit- ^ 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.
- ^ Official precipitation records for San Diego were kept at the Weather Bureau Office in downtown from October 1850 to December 1859 at the Mission San Diego and from November 1871 to June 1939 and a variety of buildings at downtown, and at San Diego Int'l (Lindbergh Field) since July 1939.[1] Temperature records, however, only date from October 1874. For more information on data coverage, see ThreadEx
References
edit- ^ Conner, Glen. History of weather observations San Diego, California 1849–1948. Climate Database Modernization Program, NOAA's National Climatic Data Center. pp. 7–8.
- ^ "NowData – NOAA Online Weather Data". National Oceanic and Atmospheric Administration. Retrieved June 14, 2021.
- ^ "Summary of Monthly Normals 1991–2020". National Oceanic and Atmospheric Administration. Archived from the original on 2023-08-08. Retrieved June 14, 2021.
- ^ "San Diego/Lindbergh Field CA Climate Normals 1961–1990". National Oceanic and Atmospheric Administration. Archived from the original on 2023-08-08. Retrieved July 18, 2020.