Albany, California

... February 2010 regional climate summary...

Summary for the San Francisco Bay area and Monterey Bay area...
February 2010 lacked any notable stand-out weather events.
Temperatures didn't stray too far from normal. Precipitation totals
were below normal across the northern part of the region and a above
normal across the south. But in general... rainfall totals were not
significantly above or below what is expected for the month of
February.

The first three days of the month were dry... but an unsettled pattern
then took over from the 4th and continued through the 12th.
During this time period... four separate rain events dropped light to
moderate amounts of rainfall. A ridge of high pressure gradually
amplified along the West Coast during the middle part of the month...
diverting the storm track well to the north of California. This
ridge resulted in eight consecutive days of dry and mild weather. Wet
weather returned on the 21st when a Pacific weather system undercut
the ridge and moved into central and Southern California. The
remainder of February was relatively wet... with the wettest
storm moving through on the afternoon and evening of the 23rd. That
storm system dropped two to four inches of rain in the coastal
mountains... and generally from one to two inches elsewhere except
for the drier inland valleys which picked up a half inch or less.
Rainfall totals for the month ranged from 70 to 100% of normal across
the San Francisco Bay area... and from 100 to 130% of normal from
Santa Cruz County south. Year-to-date rainfall totals (july 1, 2009
to February 28, 2010) range from 90 to 100 percent of normal for the
northern and central part of the San Francisco Bay area... and from
110 to 120 percent from Santa Clara County southward. These types of
rainfall departures are not unexpected in an El Nino winter when the
likelihood of above normal precipitation is greater across the
southern part of the state of California.

Temperature departures from normal during the month of February
were similar to January departures. Average high temperatures were a
little below normal and low temperatures were above normal.
Overall... mean monthly temperatures ended up very close to normal.
High temperatures at a few locations on the 23rd were the coolest on
record for the date. Otherwise... no daily record temperature records
were set or tied during February 2010.


        ... February regional temperature summary...

                                departure departure
                   avg normal from avg normal from
location high high normal low low normal

North Bay...

Angwin 54.1 55.3 -1.2 40.6 39.0 1.6
Kentfield 59.9 61.4 -1.5 45.2 42.9 2.3
Napa 61.8 62.7 -0.9 44.0 41.9 2.1
Petaluma 59.6 62.0 -2.4 42.7 40.7 2.0
Saint Helena 60.9 61.6 -0.7 44.0 39.8 4.2
San Rafael 58.0 61.1 -3.1 46.0 43.8 2.2
Santa Rosa 61.6 62.0 -0.4 43.2 41.5 1.7
Sonoma 60.8 63.5 -2.7 41.1 39.9 1.2

San Francisco peninsula...

Half Moon Bay 60.0 59.7 0.3 45.2 44.2 1.0
Pacifica 57.7 58.8 -1.1 M 45.8 M
Palo Alto 59.4 61.2 -1.8 43.9 41.4 2.5
Redwood City 60.2 62.3 -2.1 44.6 42.4 2.2
San Francisco
Airport 59.1 59.5 -0.4 48.9 45.5 3.4
San Francisco
downtown 59.5 60.9 -1.4 49.5 48.5 1.0

East Bay...

Berkeley 60.8 59.4 1.4 45.9 46.4 -0.5
Concord 61.6 61.6 0.0 46.4 44.2 2.2
Fremont 60.9 61.5 -0.6 46.7 44.3 2.4
Livermore 60.6 61.9 -1.3 43.7 40.3 3.4
Martinez 60.2 61.0 -0.8 42.5 42.0 0.5
Mount Diablo
Junction 53.4 57.2 -3.8 41.4 40.4 1.0
Newark 60.6 61.0 -0.4 47.6 45.1 2.5
Oakland 61.2 61.6 -0.4 48.6 47.9 0.7
Richmond M 61.7 M M 45.6 M

South Bay and Santa Cruz County...

Ben Lomond 61.9 63.7 -1.8 41.6 39.1 2.5
Gilroy 61.9 63.9 -2.0 44.4 40.7 3.7
Los Gatos 60.4 62.4 -2.0 43.3 40.8 2.5
Mount Hamilton 46.9 49.6 -2.7 37.4 37.1 0.3
San Jose 61.3 62.3 -1.0 46.1 44.6 1.5
Santa Cruz 62.0 62.7 -0.7 44.3 42.0 2.3
Watsonville 62.2 62.5 -0.3 44.1 41.8 2.3

Monterey and San Benito counties...

Big Sur station M 60.9 M M 44.0 M
Carmel Valley 63.0 64.2 -1.2 41.9 40.2 1.7
Hollister 61.6 63.1 -1.5 44.2 40.8 3.4
King City 63.9 65.8 -1.9 43.6 38.9 4.7
Monterey 58.9 61.6 -2.7 46.1 45.0 1.1
Pinnacles National
Monument 61.0 63.6 -2.6 37.7 35.6 2.1
Salinas 62.9 64.2 -1.3 44.4 43.3 1.1


        ... February regional precipitation summary...

                             average
                   Feb Feb percent
location total precip of normal

North Bay...

Angwin 6.71 8.00 84
Calistoga 6.65 7.84 85
Cloverdale M 7.76 M
Fort Ross M 6.27 M
Healdsburg M 8.08 M
Kentfield 9.14 9.10 100
Muir Woods 5.60 6.89 81
Napa 3.98 5.03 79
occidental 8.11 10.28 79
Petaluma 3.73 5.27 71
Saint Helena 5.91 7.21 82
San Rafael 7.39 7.41 100
Santa Rosa 4.46 5.84 76
Sonoma 3.97 6.10 65

San Francisco peninsula...

Half Moon Bay 3.32 4.91 68
Pacifica 5.04 5.91 85
Palo Alto 2.51 3.29 76
Redwood City 2.88 3.88 74
San Francisco
Airport 2.70 4.01 67
San Francisco
downtown 3.42 4.00 86
Woodside M 5.93 M

East Bay...

Berkeley 3.76 4.86 77
Concord 2.64 4.11 64
Fremont 1.97 3.61 55
Livermore 2.36 2.73 86
Martinez 2.40 3.80 63
Mount Diablo
Junction 4.11 4.49 92
Newark 1.79 2.89 62
Oakland 3.10 4.45 70
Richmond M 4.47 M

South Bay and Santa Cruz County...

Ben Lomond 10.71 9.71 110
Gilroy 2.63 3.99 66
Los Gatos 4.30 4.77 90
Mount Hamilton 4.05 4.02 101
San Jose 2.12 2.84 75
Santa Cruz 5.78 6.15 94
Watsonville 5.27 4.45 118

Monterey and San Benito counties...

Big Sur station M 8.24 M
Carmel Valley 3.96 2.94 135
Hollister M 2.98 M
King City 2.72 2.64 103
Monterey 3.50 3.75 93
Pinnacles National
Monument 4.38 3.45 127
Salinas 3.70 2.92 127


   ... daily temperature records for February 2010...

                                  record
                                  low
                                  maximum old
date temp record

2/23 San Francisco Airport 52 52 in 1969
2/23 Moffett field 53 54 in 2001
2/23 Santa Rosa 49 51 in 1916


        ... monthly ranks for downtown San Francisco...

Average high temperature... .59.5... .59th warmest out of 135 years
average low temperature... ..49.5... .32nd warmest out of 135 years
monthly rainfall... ..3.42 inches... .74th wettest out of 160 years


Note: this climatological data is preliminary. For official
certified climatological data please contact the National
climatic data center at 828-271-4800 or http://www.Ncdc.NOAA.Gov.
Official values as determined at the above web site may take
several months for authentication and publication.