Average and Median Rainfall for Lower RGV Stations
El Niño and 30–Year Averages Shown

Average and Median Rainfall for Brownsville, Harlingen, and McAllen
The graphs below show the average (green color bars, left side of page) and median (blue color bars, right side of page) rainfall for the most recent 30 year cycle (1971 to 2000, solid bars) and for El Niño years only (since 1950, shaded bars). Medians show the middle value of the data, and can be used to evaluate the skewness of a sample. The majority of the data shown are skewed "to the right", meaning that the average rainfall is higher than the median rainfall, denoting a lower frequency of higher rains but that such rains contribute greatly to the average.

Accumulated rainfall totals for three month intervals are shown. For example, "OND" shows the average rainfall for October through December, "NDJ" shows the average rainfall from November through January, etc. Rainfall accumulations in white are for the 1971 to 2000 cycle; accumulations in black are for El Niño years. Click on each graphic for a full size image.
Average Rainfall, Brownsville, For El Nino and 1971 to 2000 period of record, three month intervals (click to enlarge) Median Rainfall, Brownsville, For El Nino and 1971 to 2000 period of record, three month intervals (click to enlarge)
Average Rainfall, Harlingen, For El Nino and 1971 to 2000 period of record, three month intervals (click to enlarge) Median Rainfall, Harlingen, For El Nino and 1971 to 2000 period of record, three month intervals (click to enlarge)
Average Rainfall, McAllen, For El Nino and 1971 to 2000 period of record, three month intervals (click to enlarge) Median Rainfall, McAllen, For El Nino and 1971 to 2000 period of record, three month intervals (click to enlarge)
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