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Old 04-04-2024, 11:04 AM
 
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Quote:
Originally Posted by Cloudy Dayz View Post
Actually all day, and night. The January temperature range in the North Bay is 38ºF - 56ºF. The January temperature range in San Diego is 48ºF - 65ºF. It's all the same coastal climate. Just warmer the further south you go.

The summer temperatures follow the same pattern, except the Bay Area has a lot of micro-climates which have big temperature differences, and San Diego has a weird weather pattern in the summertime, that drops it's daytime temperatures way down. So San Diego's summertime highs are at or below the coolest micro climates in the Bay Area. San Diego has mild winters and mild summers. Which makes it arguably the most perfect climate in the country.
Where the OP lives in the North Bay is not at the coast though, it's inland. That's why I was making the distinction between coastal versus inland. The January low temperature in San Francisco is 46.6°, which is only one degree less than downtown San Diego along the bay. But San Francisco is only 58 during the day compared to 65 in San Diego. That's why I was saying, if you compare coastal locations, you'll find almost the same low temperatures in the winter in the Bay Area and San Diego, but it'll be noticeably milder during the day in San Diego. You can also go Inland in San Diego, and it'll still be 65° in the winter, but then you'll get colder nights again, just like in the Bay Area, along with occasional frost. I live in an area like that, we are Inland from San diego, and in December and january, by the time the sun sets, it's already close to 50°. But if we are leaving downtown around that time, it could be a good 10° warmer by the water.

So if the OP cares mostly about winter nighttime temperatures, then they could be pretty much anywhere in California by the water, and they should avoid Inland areas. But if they also want warmer daytime temperatures, then they should definitely go to Southern California.

BTW, the same phenomenon extends all the way up the West coast. Even seattle, 800 miles north of the Bay area, still has average winter low temperatures above freezing, which is hard to believe given their latitude. But their average high temperature is only about 44°, so the same thing happens where the farther north you go, the winter lows don't change that much but the daytime highs definitely do. The Pacific Ocean and the frequent cloud cover of the northwest keeps a lid on how cold it gets, but it also keeps a lid on how warm it gets!
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