San Diego Precipitation Page

San Diego County station list

Entries show station weight (percent), station latitude (degrees N), station longitude (degrees E), and station name for each of the 7 stations in the index.

  1  0.95 32.700 -117.200 NORTH ISLAND NAS   
  2  4.20 33.231 -116.414 BORREGO DESERT PARK
  3  5.19 32.734 -117.183 SAN DIEGO WSO AP   
  4  6.47 33.210 -117.395 OCEANSIDE MARINA   
  5 11.12 33.378 -116.840 PALOMAR MTN OBSVTRY
  6 14.95 33.237 -116.761 HENSHAW DAM        
  7 57.11 32.990 -116.587 CUYAMACA         

The station weight is the product of two terms. 1) the fraction of area the station represents in the total area of interest. So, for example, a station that is located near to another station will have less influence on the final total, while a station that is far from any other station will have more influence. 2) The average annual precipitation at that station, so that a wet station contributes more to the final index that does a dry station. The final weight is the product of these two terms, normalized so that the sum of all the weights adds up to 100%.

Stations are selected based on two criteria. 1) They must have a relatively long (50 year or more) record with few interruptions. 2) They must be updated nearly every day by the California Nevada River Forecast Center.

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