Table 6.  Summary statistics by month for water temperature, specific conductance, pH, and dissolved oxygen at San Antonio River near Elmendorf, Texas (08181800)

[°C, degrees Celsius; µS/cm, microsiemens per centimeter at 25 degrees Celsius; mg/L, milligrams per liter]
Date
Temperature
(°C)
Specific
conductance
(µS/cm)
pH
(standard units)
Dissolved
oxygen
(mg/L)
Mini-
mum
Maxi-
mum
Mean
Mini-
mum
Maxi-
mum
Mean
Mini-
mum
Maxi-
mum
Mean
Mini-
mum
Maxi-
mum
Mean
Jan. 1996
13.5
21.2
17.3
966
1,080
1,040
  
7.8
8.1
7.9
8.8
12.4
10.3
Feb. 1996
12.5
24.2
19.0
827
1,080
961
  
7.8
8.1
7.9
7.9
13.2
  9.8
Mar. 1996
13.7
24.8
20.0
623
1,020
951
  
7.6
8.0
7.8
8.1
11.7
  9.6
Apr. 1996
18.3
28.3
23.7
605
1,100
995
  
7.4
8.0
7.8
5.8
  9.9
  8.1
May 1996
22.4
31.3
27.7
490
1,070
995
  
7.4
8.1
7.9
2.4
  9.6
  7.5
June 1996
27.0
33.4
29.9
430
1,090
971
  
7.4
8.3
7.9
4.7
  9.6
  7.1
July 1996
27.4
33.2
30.7
469
1,100
972
  
7.4
8.1
7.9
3.9
  8.7
  7.0
Aug. 1996
26.7
33.2
30.0
446
1,060
962
  
7.4
8.1
7.8
6.3
  9.6
  7.5
Sept. 1996
23.9
33.7
28.1
218
986
708
  
7.2
7.9
7.7
2.5
  8.1
  7.1
Oct. 1996
21.0
27.8
25.3
933
1,050
999
  
7.7
8.0
7.9
6.8
  8.8
  7.7
Nov. 1996
15.6
26.7
21.7
387
1,060
936
  
7.8
8.1
8.0
6.8
  9.8
  8.2
Dec. 1996
13.7
22.6
18.6
533
1,060
939
  
7.9
8.2
8.0
6.9
10.5
  8.6
Jan. 1997
10.8
22.6
16.9
744
1,060
989
  
7.8
8.2
8.1
7.2
12.5
  9.6
Feb. 1997
13.5
21.6
17.6
501
1,090
948
  
7.6
8.0
7.8
7.8
12.4
  9.4
Mar. 1997
17.7
24.7
21.2
427
1,060
935
  
7.5
8.2
8.0
7.3
  9.5
  8.5
Apr. 1997
16.5
26.3
21.6
234
1,070
882
  
7.7
8.3
8.0
7.2
  9.1
  8.1
May 1997
22.0
28.9
25.4
182
1,030
809
  
7.6
8.1
7.9
4.6
  8.0
  6.9
June 1997
22.3
30.8
27.0
218
986
684
  
7.8
8.4
8.1
4.8
  8.6
  6.4
July 1997
26.8
30.9
28.7
493
865
696
  
7.9
8.3
8.0
6.2
  8.4
  7.3
Aug. 1997
27.9
31.8
29.8
779
973
908
  
7.7
8.2
8.0
5.3
  8.3
  6.8
Sept. 1997
25.9
30.9
28.8
666
985
894
  
7.7
8.2
8.0
6.2
  8.8
  7.2
Oct. 1997
20.3
28.5
24.6
291
983
771
  
7.7
8.1
8.0
4.8
  7.6
  6.5
Nov. 1997
16.3
23.1
19.3
678
981
856
  
7.9
8.2
8.0
7.4
  9.6
  8.6
Dec. 1997
13.7
20.2
16.9
265
975
835
  
7.8
8.2
8.0
6.6
10.7
  9.0
Jan. 1998
15.5
21.2
18.0
247
977
836
  
7.9
8.4
8.1
4.7
10.5
  8.0
Feb. 1998
14.0
21.1
17.7
311
915
732
  
7.7
8.2
7.9
6.4
 v9.2
  8.3
Mar. 1998
15.7
23.5
19.0
223
903
687
  
7.5
8.2
8.0
7.5
10.4
  9.0
Apr. 1998
20.0
25.3
22.8
605
958
778
  
7.7
8.0
7.9
7.1
  9.2
  8.2
May 1998
23.3
31.1
27.2
857
1,010
941
  
7.6
8.3
7.9
6.4
  9.0
  7.5
June 1998
24.9
32.8
29.9
745
1,030
918
  
7.5
8.2
7.9
6.1
  9.0
  7.4
July 1998
28.8
33.0
30.8
776
987
927
  
7.5
8.2
7.9
5.1
10.4
  7.1
Aug. 1998
25.4
33.1
29.3
150
1,010
729
  
7.5
8.4
7.9
2.7
  9.9
  6.1
Sept. 1998
25.5
30.8
28.6
321
951
817
  
7.7
8.2
8.0
4.4
  7.4
  6.8
Oct. 1998
20.1
29.8
24.4
102
959
727
  
7.6
8.3
7.8
5.4
14.3
  8.2
Nov. 1998
18.2
24.4
20.7
461
820
653
  
7.6
8.2
8.0
3.8
15.7
  7.2
Dec. 1998
12.7
23.1
17.9
690
831
760
  
7.8
8.0
7.9
3.3
10.0
  7.7

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