This page presents the summaries of weather data for the current year, 2010.

2009 archives, with some discussion of the data

Data tables for 2009 and 2010 (without discussion)

Rain Days tables and graphs

Discussion on this page for July 2010

If you check in on this table as the year progresses, you will most likely see a great deal of change in monthly rainfall and in maximum wind speed. We tend to have higher winds in the dry season and lesser winds in the rainy season. Not surprisingly, relative humidity and average solar input (an indication of cloud cover) will also be related to the monthly rainfall. We expect relatively little change in the temperatures although it ought to be somewhat cooler, on average, in the rainy season than it is in the dry season. This is the first year we have tracked average wind direction and maximum rain for one day. It is also the first year we've calculated the number of days that it rained during the month.

Rainy and dry seasons are clearly shown if you look at average monthly rainfall over time. The blue line is Señor Espinosa's rainfall data, an average based on his records dating back to 1992. The red line is the 2010 data from our station. The dry season on this chart can be defined as those months during which we receive fewer than 10 inches of rain, that is, December through April. During the rainy season, May through November, we generally receive more than 10 inches of rain each month.

In general, our rainfall data track very closely to the Espinosa data, so the 2010 differences from average are due to annual variations, not to differences between the Espinosa location and ours.

The early 2010 dry season, January through March was about what we would expect except that we had enough rainfall in February to keep the grass green.

In April our rainfall was hugely above average. We had 28.2 inches whereas the average for April is 6.7 inches. It rained during 15 of April's 30 days, but the heaviest precipitation came toward the end of the month. During the last six days in April, we were drenched with 24 inches of rain, receiving more than 5 inches during each of two of those days.

(Graphs of the amount of rainfall we received for each day of the month are presented on the Rain Days page.)

Rainfall in May was a return to average. In fact, it was nearly exactly average: we had 22.7 inches of rain; the average is 22.4 inches. We had 21 days of rain, but during only one of those days did it rain more than 5 inches.

In June of this year our rainfall was, like April, greatly above average. We had 42.8 inches; the average is 21.7 inches. It rained 27 of June's 30 days, and it rained more than 5 inches during one of those days. The temperature high dropped from May, as did the range. Not surprisingly, the average humidity increased and the solar input decreased from May.

In July we had more rainfall than in any month since Señor Espinosa began keeping records in 1992. We had 59.3 inches. July rainfall average is 17 inches; the previous July record was 38 inches.

That record was broken at 4:06 PM on July 20, 2010.

The greatest rainfall for any month in the year was in September 1999 - at 55.3 inches.

That record was broken at 4:29 PM on July 28, 2010.

It rained on 29 of July's 31 days, and it rained just over 5 inches on one of those days. All other factors that we track were about the same as they were in June.

"Average" is an interesting idea and it occurs in our area only about 14% of the time. Perhaps this is because we are so often influenced either by El Niño or La Niña events. The 2009 El Niño was winding down during January through April, giving us erratic weather. During May El Niño dissipated, and we reverted to average. The global system was predicted to move to La Niña conditions during June through August. The high rainfall in June and July - together with droughts in other places of the world - indicates that we have reached La Niña, and we can expect higher than average rainfall to continue at least through August.

For more archive information, click on our Weather Underground page link to browse through our uploaded data and archives, which date from April 1, 2009.