Octo7:35 PM - Rain file updated for September. Novem9:32 PM - Rain file updated for October. This is the 9th time November has had no rain sine 1850, and the first time since 1980.
UT SAN DIEGO WEATHER UPDATE
If the freaky thing occurs, I'll update the file again. The month has 4 days to go but there is zero, nada, no way there will be any rain in the next four days. Novem7:30 PM - Rain file updated for November.
San Diego average annual rainfall by decade in inches. This is because the first year of the decade, 2010, had a fat 16.26". This streak of streaks has been broken! The latest streak started in 2011 and is still going after 8 years! None-the-less, the average for the latest decade is not particularly low as shown in the decade chart, below. Whenever a streak started and got up to 6 years in a row, the streak was broken in the following year. There is an interest phenomenon when looking at years with less than 11 inches of rain. Janunote: One thing of interest is to look at the calendar year chart. So despite increasing sea levels, decreasing polar ice, increasing temperatures, increasing carbon dioxide, increasing methane and increasing nitrous oxide, the rains continue to be quite constant when grouped by decade. The annual average for the last 170 years is 9.86".
Warmer temperatures cause more precipitation to fall as rain instead of snow over the mountains, and with a reduced snow pack there are reduced snow melts available to feed some reservoirs during the dry season.ĭecemnote: The decade is done, the average annual rain for the 2010's (2010 through 2019) came in at 9.63" at the San Diego Airport, thanks to a very wet 20. This means that the rate evaporation is increasing, which in turn increases the demand for irrigation (note: more research here is needed) My San Diego Temperature page shows a clear increase in temperature over the long term. However: Even if rainfall remains fairly constant on a per decade basis, there are three factors which are contributing to increased water shortages: According to the following chart I prepared from the data file, grouping average rainfall by decade, rainfall has been remarkably steady. The long term pattern suggests there is not. Is there major climate change going on here in San Diego as far as rain is concerned? This chart updated annually in early July San Diego Rainfall by Season in inches (July 1 through June 30) If you are looking for official NWS statistics for recent days and months, go to NWS San Diego Forecast Office (climate data). The current official NWS records go back to 1875 perhaps for this reason. I recall it being in something like nine different locations since 1850. Also the rain gage wasn't always at the same exact location, there's a story about this somewhere on the web. Some of the totals in the early years may result from incomplete data. The data was derived from NWS records going back to 1850, the link I use to have here no longer works. Scroll down for notes about recent rain activity and file updating. I try to keep the file "reasonably current". Then open a spreadsheet program and import the data from the saved text file. It is easy to bring the data into a spreadsheet. The data will come up as a separate page. Year, Jan, Feb, Mar, Apr, May, Jun, Jul, Aug, Sep, Oct, Nov, Dec, YearTotal, NextJan, NextFeb, NextMar, NextApr, NextMay, NextJun, SeasonTotalĭOWNLOAD: File is here (sandiegorain.txt). The file is comma delimited, in the format of: I have developed a file of monthly San Diego rainfall data which presents the data by both calendar year AND by season (running from July to June).įor commentary on recent rain events or ongoing rain activity see Weather Notes. Most records are kept by calendar year, but San Diego's weather is highly seasonal with most of the rain falling in the November-March time period. As a San Diego resident I've found it hard to find a convenient place to find annual rainfall data for San Diego in a useful format.
0 kommentar(er)
