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Death Valley, California, United States of America. Author Wolfgangbeyer. Licensed under the Creative Commons Attribution-Share Alike
Death Valley, California, United States of America. Author Wolfgangbeyer

California climate: when to go to California

California, the third largest state by extension of the United States of America has a number of climate types, ranging from arid desert climate of the south of the state, the semi-arctic climate of the higher mountain areas, through the Mediterranean climate of much of the state.

In the areas subject to the Mediterranean climate, ie the central coast and inland valleys, summers are hot and dry and winters are cool and wet. Along the coast fog is very frequent, caused by the presence of cold currents in the ocean water, usually just move a few kilometers inland to find a shining sun. In inland areas the cold in winter and hot in summer are more pronounced than along the coast.

The areas of south-eastern California have a desert climate, hot and dry like the Sahara desert, between these areas the hottest is the so-called Valley of Death, with average maximum temperatures of 47 ° C in July and average minimum of 31 ° C, and where we have reached extreme values ​​of 57 ° C.

Redwood National Park, California, United States of America. Author NPS Photo. No Copyright

Redwood National Park, California, United States of America. Author NPS Photo

Temperatures are mild along the coast, in San Francisco the maximum average values ​​ranging between 13 ° C in January and December and 23 ° C in September, while the average minimum temperatures vary between 5 ° C in January and 13 ° C in August and September. The city of Los Angeles is warmer with an average minimum temperatures of 9 ° C in winter and 18 ° C in August, the average maximum temperatures vary between 18 ° C winter and 25 ° C in August and September. Inland, the seasonal differences are more pronounced, in Fresno, the average minimum temperatures reach 2 ° C in December and 18 ° C in July, while the average maximum temperatures vary between 12 ° C of winter and 37 ° C in July.

The northern areas of California have a much more rainy and humid climate than the central and southern areas. In Northern California we have values ​​ranging between 380 mm of rain in a year in the inner regions close to the border with Nevada, and 1,300 mm in coastal areas around Eureka, with peaks of 2,500 mm in Redwood National Park. Along the coast, in San Francisco, there are values ​​around 500 mm per year, the rains fall generally between November and March.

Los Angeles, California, United States of America. Author Jon Sullivan. No Copyright

Los Angeles, California, United States of America. Author Jon Sullivan

Even the central areas of the country have varying values ​​of precipitation, the central valley has the highest values ​​in its northern part, while the southern areas have very low values ​​which are close to the desert climate. The city of Fresno, in central California, has an average of 265 mm of rain in a year, the rains fall almost exclusively between November and March. The city of Los Angeles, located along the southern coast, receives on average 300 mm of rain per year, even here the rains fall generally between November and March.

The snow is in winter in most of the mountainous areas of the state, especially in the mountains of the Sierra Nevada. The presence of the mountains affect the climate, the slopes of the mountain ranges to the west are the wettest, while the eastern slopes are drier and often arid,  in areas east of the mountains often the climate is desert.

WHEN TO GO TO CALIFORNIA

Il periodo migliore per una visita della California è quello tra aprile e ottobre, considerando che i mesi estivi presentano, nelle aree desertiche e semi-desertiche dello stato valori di temperatura notevolmente alti.

The best time for a visit in California is between April and October, whereas the summer months have, in the areas of desert and semi-desert of the state,  have significantly higher values ​​of temperature.

Climate of San Francisco.

Climate of Los Angeles.

CALIFORNIA CLIMATIC TABLES

LOS ANGELES (39 metres)
Month Average low (°C) Average high (°C) Precip. (mm) Precip. days
January 9,3 18,1 68,8 6,0
February 10,0 17,9 82,6 6,6
March 10,9 18,0 47,0 5,8
April 12,1 19,1 17,8 2,8
May 14,1 20,1 5,6 1,2
June 15,8 21,4 2,0 0,6
July 17,6 23,2 0,8 0,5
August 17,9 23,8 1,3 0,3
September 17,3 23,7 5,3 1,0
October 15,2 22,5 14,2 2,3
November 11,8 20,5 28,2 3,4
December 9,3 18,1 52,1 5,2
YEAR 13,4 20,6 325,6 35,7

SAN FRANCISCO (39 metres)
Month Average low (°C) Average high (°C) Precip. (mm) Precip. days
January 7,6 13,8 114,3 11,7
February 8,6 15,7 113,3 11,1
March 9,2 16,6 82,8 11,0
April 9,6 17,3 37,1 6,5
May 10,6 17,9 17,8 3,8
June 11,6 19,1 4,1 1,5
July 12,3 19,2 0,0 0,3
August 12,8 20,1 1,5 1,0
September 12,8 21,2 5,3 1,7
October 12,1 20,7 28,4 3,9
November 10,1 17,3 80,3 8,9
December 7,8 13,9 115,8 11,6
YEAR 10,4 17,7 600,7 73,0

FRESNO (94 metres)
Month Average low (°C) Average high (°C) Precip. (mm) Precip. days
January 3,5 12,7 55,6 7,6
February 5,3 16,4 51,6 8,6
March 7,6 19,8 51,6 7,5
April 9,7 23,7 24,1 4,5
May 13,4 28,9 10,9 2,2
June 16,9 33,3 5,3 0,7
July 19,8 36,9 0,3 0,2
August 19,0 36,2 0,3 0,3
September 16,4 32,7 4,3 1,0
October 11,7 26,4 16,0 2,5
November 6,3 18,4 27,2 5,5
December 3,3 12,7 45,0 7,5
YEAR 11,1 24,8 292,1 48,1

SAN FRANCISCO
Month Sea Water Temperature °C
January 12
February 12
March 12
April 12
May 12
June 12
July 13
August 14
September 15
October 14
November 14
December 13

LOS ANGELES
Month Sea Water Temperature °C
January 14
February 14
March 14
April 14
May 15
June 16
July 18
August 18
September 18
October 18
November 16
December 15

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