2017-Precipitation-Report

back to 1934. These records indicate how vari- able rainfall can be at any location from year to year. For example, the lowest annual rainfall to- tal observed at San Antonio Airport rain gauge was 13.7 inches in 1954, while the highest was 52.3 inches in 1973. Although these records show extended periods of above-average or below-average rainfall, there does not appear to be any significant trend of increasing or de- creasing annual rainfall totals in the region over the long term.

The long-term records for these rain gauges and many other weather stations throughout the region can be obtained online from the Na- tional Centers for Environmental Information (formerly the National Climatic Data Center) at http://www.ncdc.noaa.gov/cdo-web/search . Data from the EAA’s rain gauge network or calibrated NEXRAD database may be obtained from EAA upon request.

TABLE 1. 2017 RAINFALL TOTALS FOR NINE DELINEATED CONTRIBUTING ZONE WATERSHEDS.

Gauge

2017 Area Average Rainfall (inches)

Nueces-West Nueces River Basins

22.0 24.3 22.2 22.7 24.0 25.2 26.1 24.3 30.9

Frio-Dry Frio River Basins

Sabinal River Basin

Area Between Sabinal and Medina River Basins

Medina River Basin

Area Between Medina and Cibolo River Basins

Cibolo and Dry Comal Creek Basins

Guadalupe River Basin

Blanco River Basin

TABLE 2. DEVIATION FROM MEAN RAINFALL VALUES, 2017. RAINFALL AMOUNTS ARE IN INCHES

2017 Total 27.33 42.56 24.32 27.14 28.84 20.03

Station Name

County

Long-Term Average

Deviation from Average

San Antonio Intl. Airport

Bexar

30.61 34.36 28.62 24.16 34.14 22.20

−3.28

San Marcos

Hays

7.24

Hondo Sabinal Boerne

Medina Uvalde Kendall Kinney

−4.40

2.24

−5.30 −1.46

Brackettville 22N

3

20 17 PR E C I P I TAT I ON I N THE E DWARD S AQU I F E R R EG I ON