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The climate of Los Angeles is mild to hot year-round, and mostly dry. It is classified as borderline Mediterranean and semi-arid. The city is characterized by seasonal changes in rainfall—with a dry summer and a winter rainy season. Under the Köppen climate classification, the coastal areas are classified as BSh and Csb, while the inland areas are classified as BSh and Csa.
The Los Angeles area contains microclimates, where daytime temperatures can vary as much as 36 °F (20 °C) between inland areas such as the San Fernando Valley or San Gabriel Valley, and the coastal Los Angeles Basin. The two northernmost cities in Los Angeles County, Palmdale and Lancaster, frequently receive snow in the winter due to their altitude of approximately 2,500 feet (760 m), while their summers are hotter than the rest of the county.
Classifications
| Climatic scheme | Initials | Description |
|---|---|---|
| Köppen system[1][2][3] | BSh, Csa, Csb | Hot-semi-arid climate Hot-summer Mediterranean climate Warm-summer Mediterranean climate |
| Trewartha system[4][5] | Cs | Subtropical dry summer climate |
| Alisov system[6] | — | Subtropical climate |
| Strahler system[7] | — | Mediterranean climate |
| Thornthwaite system[8] | D B'3
|
Semiarid and warm-mesothermal |
| Neef system[9][10] | — | West side/Winter rainy climate |
Temperatures and seasons
The primary weather station for Los Angeles is located near downtown at the University of Southern California campus, and this article refers primarily to climate data generated by this station as representative of the Los Angeles metropolitan area as a whole.
The summer dry season normally runs from May through October, when clear skies, hot temperatures, and very little change in sensible weather occur from day to day. Average high temperatures are in the lower 80's F (26-28 C) with overnight lows in the lower 60's F (15-17 C). During this season, there is essentially no rainfall, and both July and August average less than 0.05 of an inch (1.27 mm) of monthly precipitation.
The winter wet season normally runs from November through April. Precipitation episodes in Los Angeles, with a few notable exceptions, are largely caused by extratropical disturbances approaching California from the west or northwest during the winter season. Of the total annual precipitation recorded in Los Angeles, 92% falls between November 1 and April 30.[11] Despite the increased rain, the winter months are still frequently sunny and pleasant, however, with mild-to-warm temperatures. The average highs range from the upper 60's F to lower 70's F (17-21 C) with cooler overnight lows in the upper 40's and lower 50's F (8-12 C).
| Month | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Year |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Record high °F (°C) | 95 (35) |
95 (35) |
99 (37) |
106 (41) |
103 (39) |
112 (44) |
109 (43) |
106 (41) |
113 (45) |
108 (42) |
100 (38) |
92 (33) |
113 (45) |
| Mean maximum °F (°C) | 83.0 (28.3) |
82.8 (28.2) |
85.8 (29.9) |
90.1 (32.3) |
88.9 (31.6) |
89.1 (31.7) |
93.5 (34.2) |
95.2 (35.1) |
99.4 (37.4) |
95.7 (35.4) |
88.9 (31.6) |
81.0 (27.2) |
101.5 (38.6) |
| Mean daily maximum °F (°C) | 68.0 (20.0) |
68.0 (20.0) |
69.9 (21.1) |
72.4 (22.4) |
73.7 (23.2) |
77.2 (25.1) |
82.0 (27.8) |
84.0 (28.9) |
83.0 (28.3) |
78.6 (25.9) |
72.9 (22.7) |
67.4 (19.7) |
74.8 (23.8) |
| Daily mean °F (°C) | 58.4 (14.7) |
59.0 (15.0) |
61.1 (16.2) |
63.6 (17.6) |
65.9 (18.8) |
69.3 (20.7) |
73.3 (22.9) |
74.7 (23.7) |
73.6 (23.1) |
69.3 (20.7) |
63.0 (17.2) |
57.8 (14.3) |
65.8 (18.8) |
| Mean daily minimum °F (°C) | 48.9 (9.4) |
50.0 (10.0) |
52.4 (11.3) |
54.8 (12.7) |
58.1 (14.5) |
61.4 (16.3) |
64.7 (18.2) |
65.4 (18.6) |
64.2 (17.9) |
59.9 (15.5) |
53.1 (11.7) |
48.2 (9.0) |
56.8 (13.8) |
| Mean minimum °F (°C) | 41.4 (5.2) |
42.9 (6.1) |
45.4 (7.4) |
48.9 (9.4) |
53.5 (11.9) |
57.4 (14.1) |
61.1 (16.2) |
61.7 (16.5) |
59.1 (15.1) |
53.7 (12.1) |
45.4 (7.4) |
40.5 (4.7) |
39.2 (4.0) |
| Record low °F (°C) | 28 (−2) |
28 (−2) |
31 (−1) |
36 (2) |
40 (4) |
46 (8) |
49 (9) |
49 (9) |
44 (7) |
40 (4) |
34 (1) |
30 (−1) |
28 (−2) |
| Average rainfall inches (mm) | 3.29 (84) |
3.64 (92) |
2.23 (57) |
0.69 (18) |
0.32 (8.1) |
0.09 (2.3) |
0.02 (0.51) |
0.00 (0.00) |
0.13 (3.3) |
0.58 (15) |
0.78 (20) |
2.48 (63) |
14.25 (362) |
| Average rainy days (≥ 0.01 in) | 6.1 | 6.3 | 5.1 | 2.8 | 1.9 | 0.5 | 0.4 | 0.1 | 0.4 | 2.2 | 2.8 | 5.5 | 34.1 |
| Mean monthly sunshine hours | 225.3 | 222.5 | 267.0 | 303.5 | 276.2 | 275.8 | 364.1 | 349.5 | 278.5 | 255.1 | 217.3 | 219.4 | 3,254.2 |
| Percent possible sunshine | 71 | 72 | 72 | 78 | 64 | 64 | 83 | 84 | 75 | 73 | 70 | 71 | 73 |
| Average ultraviolet index | 2.9 | 4.2 | 6.2 | 8.1 | 9.2 | 10.4 | 10.8 | 10.0 | 8.1 | 5.4 | 3.5 | 2.6 | 6.7 |
| Source 1: NOAA (sun 1961–1977)[12][13][14][15] | |||||||||||||
| Source 2: UV Index Today (1995 to 2022)[16] | |||||||||||||
| Month | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Year |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Record high °F (°C) | 91 (33) |
92 (33) |
95 (35) |
102 (39) |
97 (36) |
104 (40) |
97 (36) |
98 (37) |
110 (43) |
106 (41) |
101 (38) |
94 (34) |
110 (43) |
| Mean maximum °F (°C) | 81.2 (27.3) |
80.1 (26.7) |
80.6 (27.0) |
83.1 (28.4) |
80.6 (27.0) |
79.8 (26.6) |
83.7 (28.7) |
86.0 (30.0) |
90.7 (32.6) |
90.9 (32.7) |
87.2 (30.7) |
78.8 (26.0) |
95.5 (35.3) |
| Mean daily maximum °F (°C) | 66.3 (19.1) |
65.6 (18.7) |
66.1 (18.9) |
68.1 (20.1) |
69.5 (20.8) |
72.0 (22.2) |
75.1 (23.9) |
76.7 (24.8) |
76.5 (24.7) |
74.4 (23.6) |
70.9 (21.6) |
66.1 (18.9) |
70.6 (21.4) |
| Daily mean °F (°C) | 57.9 (14.4) |
57.9 (14.4) |
59.1 (15.1) |
61.1 (16.2) |
63.6 (17.6) |
66.4 (19.1) |
69.6 (20.9) |
70.7 (21.5) |
70.1 (21.2) |
67.1 (19.5) |
62.3 (16.8) |
57.6 (14.2) |
63.6 (17.6) |
| Mean daily minimum °F (°C) | 49.4 (9.7) |
50.1 (10.1) |
52.2 (11.2) |
54.2 (12.3) |
57.6 (14.2) |
60.9 (16.1) |
64.0 (17.8) |
64.8 (18.2) |
63.7 (17.6) |
59.8 (15.4) |
Zdroj:https://en.wikipedia.org?pojem=Climate_of_Los_Angeles|||