Bonus List

CLOUDY NIGHTS, SUNNY DAYS: U.S. CITIES MOST LIKELY TO HAVE OVERCAST SKIES AT NIGHT VERSUS DAY
Coastal California is known for having a lot of low clouds (and sometimes fog) at night and in the morning, but it is usually sunny during the afternoon. This is especially true in southern California where a few locations are twice as likely (or 100% more likely) to have overcast skies at night (hours calculated between 9 PM and 5 AM standard time) as during the day (hours calculated between 9 AM and 5 PM standard time).

Most other parts of the United States either are more likely to be cloudy during the day or have a fairly even distribution between daytime and nighttime cloudiness.

Cities are listed below if they have an airport observation (or one nearby) with a long-term record. Many nearby cities would likely make this list if they could be included.

CITY, STATE

1. Oceanside, California*
2. Imperial Beach, California
3. San Diego, California
4. Irvine, Califonia**
5. Long Beach, California
5. Santa Maria, California
7. Los Angeles, California***
7. Monterey, California
9. Victorville, California
10. Oxnard, California****

HOW MUCH MORE OFTEN
(%) OVERCAST SKIES OCCUR
BETWEEN 9 PM AND 5 AM
VERSUS 9 AM AND 5 PM
167
128
107
104
75
75
54
54
44
34

* Data used from Camp Pendleton.
** Data used from Tustin and El Toro (former bases now closed).
*** Data used from LAX.
**** Data used from Pt. Mugu.

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