July average maxima in San Francisco coolest since 1971

Supposedly Mark Twain once asserted: “The coldest winter I ever spent was a summer in San Francisco.” This July was cold, and Twain’s quote? Well, read on.

San Francisco - click to enlarge - image: Wikimedia

My friend Jan Null, former lead forecaster for the NWS in California, is now runs a private forecasting and forensic weather services business. He sends out regular emails with note of interest. Here is one of them:

With an average monthly maximum  July temperature of just 63.1 degrees, San Francisco had its coolest July since 1971 and the 13th coolest in the past 97 years.  Only one day reached the 70 degree mark (72 degrees on 7/3 and no day after the 17th exceeded 64 degrees.

Downtown San Francisco, CA

Average July monthly maximum temperatures

(See table below)

Rank Year Avg. Max (°F)
1 1962 60.52
2 1951 61.13
3 1944 61.55
4 1956 61.90
5 1965 61.94
6 1914 62.06
7 1955 62.52
8 1971 62.68
9 1919 62.90
10 1949 63.00
11 1968 63.00
12 1950 63.03
13 2010 63.10
14 1970 63.13
15 1969 63.29
16 1938 63.32
17 1982 63.32
18 1960 63.39
19 1958 63.55
20 1981 63.71
21 1966 63.81
22 2000 63.84
23 1953 63.87
24 1943 63.90
25 1952 63.94
26 1967 63.94
27 1978 64.06
28 1920 64.10
29 1945 64.13
30 1976 64.23
31 1973 64.32
32 1937 64.39
33 1928 64.42
34 1939 64.42
35 1975 64.52
36 1999 64.55
37 1964 64.61
38 1942 64.68
39 1924 64.71
40 1927 64.77
41 1948 64.87
42 1980 64.87
43 1941 64.94
44 1977 64.94
45 1930 65.06

Jan Null

Certified Consulting Meteorologist

Golden Gate Weather Services

Webpage: http://ggweather.com

===================================

About the Twain quote: Snopes.com reports that he never said it.

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Peter Templeton
August 3, 2010 7:41 am

“Hate California,it’s cold and it’s damp”.Cole Porter had it right.
Lumber Jack.

August 3, 2010 7:50 am

E.M.Smith: August 3, 2010 at 1:10 am
I use C, F, K, and even R sometimes.
[break]
Put another stick 15 degrees away (you can do that without advanced tools…).
Fifteen degrees C, F, K, or R?
Umm — it’s going it hurt, isn’t it…?

August 3, 2010 8:00 am

GM: August 3, 2010 at 2:42 am
Which is only relevant to the argument about global climate change as far as the contribution of California to the global annual temperatures goes. Which is very small.
The same is true for the US as a whole. Another recent post was showing the map of the US and the how “cold” it is in the southern parts – that the northern part of the US are hotter than usual and that the whole of Canada is much hotter than usual was left out.

And still more posts are (and have been) about the ocean surface temperatures — which happen to be cooling now — and which comprise roughly 75% of the *global* temperature. Or would, unless you flip the bias toward the land…

NoAstronomer
August 3, 2010 8:11 am

phlogiston said :’I doubt any of us will still be alive the next time there is a “hottest year on record”.’
Don’t be silly. 2011 will be the hottest year on record. And then it will be 2012, and then 2013…

layne blanchard
August 3, 2010 8:44 am

GM says:
August 3, 2010 at 2:42 am
Everyone here is aware that the period following 1977 has been warm. You lament that you can only work with facts and logic. So you’ll be particularly interested in this:
http://icecap.us/images/uploads/DrKeen2.jpg
The facts are that the Global Temperature Record we are bombarded with in the media is riddled with errror and outright fraud.

latitude
August 3, 2010 9:05 am

NoAstronomer says:
August 3, 2010 at 8:11 am
Don’t be silly. 2011 will be the hottest year on record. And then it will be 2012, and then 2013…
===========================================================
I predict it will be the hottest right before every election cycle.

Ben
August 3, 2010 9:27 am

It’s my understanding that in the 1970’s Climate Scientists were telling us that we were probably entering a new Ice Age.

peterhodges
August 3, 2010 11:28 am

i have been following the cool summer thing, but i just got back from the eastbay and was shocked at how cool it was even there, beyond the fog.
in dublin it was barely 80F and quite chilly at night. i believe that must be 20F below normal!
kind of like our april, may and june over here in the eastern sierra.
i did not check the actual temp but the central valley did not seem so bad either, it was warmer in the foothills. the cool ocean air is really doing a job.

Enneagram
August 3, 2010 11:28 am

That’s because there is a new neighbour in California, cold follows him wherever he goes….

Enneagram
August 3, 2010 11:31 am

Try to live each and every minute of this summer……you will miss it!

PJB
August 3, 2010 12:33 pm

From the NASA GISS personnel blurb for Dr. Hansen,
http://www.giss.nasa.gov/staff/jhansen.html
in his own words…(my bolding)
One of my research interests is radiative transfer in planetary atmospheres, especially interpreting remote sounding of the earth’s atmosphere and surface from satellites. Such data, appropriately analyzed, may provide one of our most effective ways to monitor and study global change on the earth. The hardest part is trying to influence the nature of the measurements obtained, so that the key information can be obtained.
Pretty much sums it all up, I daresay.

DirkH
August 3, 2010 1:14 pm

Enneagram says:
August 3, 2010 at 11:28 am
“That’s because there is a new neighbour in California, cold follows him wherever he goes….”
You’re right. And the cold from Antarctica already tried to reach up to Mexico… Cancun is coming, and probably Al wants to visit…

John Trigge
August 3, 2010 1:35 pm

crosspatch says:
August 3, 2010 at 12:51 am
Isn’t it valid (according to ‘climate scientists’) to extrapolate one temp up to 1200 miles away?
Both Yosemite and Eureka are far less than that and also within the 250 mile limit used by other ‘climate scientists’.

Tony Hansen
August 3, 2010 1:50 pm

I’m sure I was taught that if you could remember Frisco in ’71, you weren’t really there.

sky
August 3, 2010 4:18 pm

crosspatch says:
August 3, 2010 at 12:52 am
“Dang spellcheck, meant climatic … jeez.”
But you’re also right when you say they’re in different CLIMACTIC regions. 😉
I usually ignore daily records in the US as being fodder for news bunnies. Records in relatively short series of a century or less are destined to be broken quite frequently. But with monthly records that amount to the coldest in 77 years (as in coastal San Diego, where the population was an order of magnitude smaller back then), we cross over into the realm of possible harbingers of a significant climatic swing, driven by oceanic cycles. I’m waiting through 2012 for confirmation, however. (Meanwhile, anything on climactic swinging is best left unsaid.)

August 3, 2010 4:27 pm

Cold summers, earthquakes, radical politics and no good beaches.
Why would anyone want to live there? I guess maybe if you like those things…

Northern Exposure
August 3, 2010 6:54 pm

Many areas of the globe are seeing unprecidented cool weather.
But just the same… Anyone willing to jump in on a wager that July will still end up to be one of the hottest on record ?
… as will August
… and September
… and October
etc etc
(of course they’ll toss in the odd cool month every now and then just to throw us off the scent of the trail)
Mighty good thing those surface station sites are all slowly getting closer and closer to the equator, otherwise the climatologists might be forced to sing a different song. And that just wouldn’t be good for cap and trade, now would it ?

william
August 4, 2010 7:43 am

Just returned from visiting family and friends in Southern California. North Orange County beaches (Huntington & Bolsa Chica) were very cool in the mornings with overcast/cloudy skies that didn’t burn off at all. Water temp was a chilly 63 degrees.
My friends and I have surfed southern California beaches for the last 30+ years and don’t remember the ocean being this cold so late in the season. Cloudy/overcast skies are typical “June gloom” along the coast into early July. This year the “gloom” has lasted into late July/early August.

Rodrigo
August 5, 2010 5:52 am

Here in Brazil we had -10°C in some cities of the south, and for the first time some cities experienced snow, but all we see and hear is about Russia and their heatwaves

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