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JANUARY 1999 WEATHER SUMMARY

January was best characterized by persistent below average temperatures and snow to low elevations in the Bay Area hills, down to 1,500' on several occasions.  Measurable snow fell (up to 6"!) in the Bakersfield area for the first time in over a quarter century in the middle of the month. Frost and freezes were frequent occurrences throughout the area, as well as in Pacifica on numerous occasions. By comparison, last year no frosts of significant amount occurred in Pacifica, while this year alone over 20 days with frost have occurred since early December, '98.  The month started out very dry and coupled with the cold, dry December, one of the longest dry periods in normally our wettest months occurred. Almost 6 weeks of dry weather (except for our freakish snow on Dec. 20) finally came to an end on the 15th. It then rained for 12 out of 16 days. The pattern, while cold, began to take on a more normal Pacific coast feel with fronts swinging through the area every 36-48 hours. Total rain on 12 days this month was 5.87", a nearly average month (based on long term norms, but significantly under the over 8" we have averaged over the last 5 years). Heaviest rain event occurred on 1/29-1/30 when 1.24" fell in a 6 hour period. This was the first month since the onset of our current La Nina that we had anything close to normal rainfall, and for the year, we now have 13.80", which is about 70% of normal to date. Because of the cold temps, snowfall totals have also increased significantly in the Sierra, but water content is expected to be below normal due to drier snow than normal. To date, we have not experienced a true Pineapple Connection along the Central Coast as can sometimes occur in La Nina years, although the North Coast and the Pacific Northwest have been pummeled. The general pattern remains progressive, so prolonged intense rains do not appear likely in the near future...although in past years February has been a month where tropical rains can fall in large amounts.

                   MONTHLY CLIMATOLOGICAL SUMMARY for JAN. 1999


NAME: HOME CITY: Pacifica  STATE: Ca  ELEV: 540'  LAT: 37.36'N  LONG: 122.27'W 


                   TEMPERATURE (°F), RAIN  (in), WIND SPEED (mph)


                                      HEAT  COOL        AVG
    MEAN                              DEG   DEG         WIND                 DOM
DAY TEMP  HIGH   TIME   LOW    TIME   DAYS  DAYS  RAIN  SPEED HIGH   TIME    DIR
------------------------------------------------------------------------------------
 1  49.3  59.4   2:30p  42.5   7:00a  14.0   0.0  0.00   1.5  15.0   3:00p     N
 2  56.5  63.2   3:00p  48.3  12:30a   9.3   0.0  0.00   6.3  24.0   8:30a   NNE
 3  57.1  61.9   1:30p  51.2  12:00m   8.4   0.0  0.00   5.7  28.0   3:30a    NE
 4  53.7  60.2   4:00p  48.9   8:30a  10.4   0.0  0.00   4.0  19.0  12:00p   WNW
 5  55.6  62.3   2:00p  49.4  12:00m   9.2   0.0  0.00   4.0  19.0  12:30a     S
 6  50.3  59.6   3:30p  44.3   8:00a  13.1   0.0  0.00   1.9  16.0  12:30p     N
 7  49.0  53.8   1:30p  43.7  10:30p  16.3   0.0  0.00   2.1  12.0   6:30a   NNE
 8  51.6  58.4   2:30p  43.5  12:30a  14.0   0.0  0.00   4.9  23.0   9:30p   NNE
 9  51.8  58.2   4:30p  44.7   8:30a  13.5   0.0  0.00   4.7  22.0   1:00p   NNE
10  52.6  63.2   2:30p  47.9   3:00a   9.4   0.0  0.00   4.4  23.0   6:00a     S
11  50.5  57.9  12:00p  46.4   8:00a  12.8   0.0  0.00   2.1  13.0   8:30p     E
12  50.0  58.7   1:30p  44.1   8:00a  13.6   0.0  0.00   2.3  14.0   9:30p   SSW
13  50.0  55.7   3:00p  45.7  11:30p  14.3   0.0  0.00   2.2  14.0   1:30p   WNW
14  53.2  60.3   3:30p  47.0   3:00a  11.3   0.0  0.01   3.4  16.0  12:00p     N
15  54.8  59.4   3:30p  51.3   2:30a   9.7   0.0  0.30   2.4  21.0  10:00p     S
16  53.4  55.4   1:00p  50.6  11:30p  12.0   0.0  0.13   2.2  15.0  12:30a   SSW
17  53.9  56.1  11:00a  51.2  12:30a  11.3   0.0  0.19   8.9  36.0  10:30p     S
18  54.8  57.5   2:00p  53.2  12:00m   9.7   0.0  1.38   6.7  31.0  12:30a     S
19  54.9  57.4   1:30p  53.3  12:30a   9.7   0.0  1.08   8.8  33.0   9:30p     S
20  53.4  55.6   1:30a  51.1   2:30p  11.7   0.0  0.17  11.1  42.0   2:30p     S
21  51.9  56.5   2:30p  48.1   8:00a  12.7   0.0  0.00   2.3  18.0  12:30a   SSW
22  52.3  57.7  11:30a  49.6   3:30a  11.3   0.0  0.23   7.9  37.0  10:30p     S
23  47.8  54.5   1:00a  40.9  10:30p  17.3   0.0  0.86   2.9  28.0  12:30a   SSW
24  43.6  50.4   3:30p  38.3   3:30a  20.7   0.0  0.00   2.5  16.0   2:30p   NNE
25  48.1  53.6  12:00p  44.0   4:00a  16.2   0.0  0.02   4.0  22.0   4:00p     S
26  45.0  48.2   3:30p  41.6  11:30p  20.1   0.0  0.26   4.7  26.0   6:30a     N
27  46.4  56.2   1:30p  40.8   5:00a  16.5   0.0  0.00   1.7  15.0   1:00p     N
28  46.7  54.1   2:00p  41.2   5:00a  17.3   0.0  0.00   1.7  12.0  12:00p     S
29  48.1  55.9   5:00p  42.7   3:30a  15.7   0.0  0.01   2.7  19.0  11:30a     S
30  49.9  55.8  12:00p  42.7   4:30a  15.8   0.0  0.44   5.9  46.0  12:30p   SSW
31  47.8  50.6   3:30p  42.7  12:00m  18.3   0.0  0.79   5.8  29.0   2:30p   WNW
-------------------------------------------------------------------------------------
    51.1  63.2     2    38.3    24   415.7   0.0  5.87   4.2  46.0    30       S


Max >= 90.0:  0
Max <= 32.0:  0
Min <= 32.0:  0
Min <=  0.0:  0
Max Rain: 1.38 ON  1/18/99
Days of Rain: 12 (>.01 in) 11 (>.1 in) 2 (>1 in)
Heat Base:  65.0  Cool Base:  65.0  Method: (High + Low) / 2