Table 1-2.
Climatological Data for the
South Central Texas Region

 

 

 

 

Temperature

Annual Net Lake Surface Evaporation
(inches)

 


Precipitation

 

Mean Daily Minimum

Mean Daily Maximum



River Basin

Mean
Annual
(inches)


Wettest
Month(s)


Driest
Month(s)

Mean
Annual
(°F)


January
(°F)


July
(°F)


January
(°F)


July
(°F)

Rio Grande

25

Sept.

Mar.

74

48

74

71

96

65

Nueces

23

May, Sept.

Mar.

71

40

72

65

98

45

San Antonio

30

Sept.

Mar., Dec.

70

41

74

64

96

31

Guadalupe

32

May, Sept.

Mar.

79

37

71

60

95

37

Colorado

34

May, Sept.

Jan.

68

39

74

60

96

35

Lavaca

38

May, Sept.

Mar., July

70

41

72

65

98

24

Lavaca-Guadalupe

37

Sept.

Mar., July

70

44

76

64

94

25

San Antonio-Nueces

33

Sept.

Mar.

71

43

73

65

96

30

Colorado-Lavaca

41

Sept.

Mar., July

70

43

78

64

91

20

Source: TWDB, “Continuing Water Resources Planning and Development for Texas,” May 1977.