Table 1.  Summary statistics by month for water temperature, specific conductance, pH, and dissolved oxygen at Frio River at Concan, Texas (08195000)

[°C, degrees Celsius; µS/cm, microsiemens per centimeter at 25 degrees Celsius; mg/L, milligrams per liter; --, monitor not in operation or probe malfunction during month]
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. 1997
  7.0
17.3
11.8
416
436
424
8.0
8.2
8.1
9.3
12.8
10.9
Feb. 1997
10.6
18.6
14.0
394
424
416
7.9
8.3
8.0
8.9
11.8
10.3
Mar. 1997
14.7
22.6
18.2
383
428
417
7.9
8.2
8.1
8.1
10.7
  9.3
Apr. 1997
15.5
24.6
19.3
215
462
446
7.9
8.3
8.0
7.5
10.9
  9.4
May 1997
18.6
28.4
23.2
418
463
444
7.8
8.1
8.0
6.9
10.0
  8.5
June 1997
19.8
28.5
25.0
120
469
415
7.8
8.3
8.0
--
--
--
July 1997
24.1
29.6
26.4
421
467
446
7.8
8.0
7.9
--
--
--
Aug. 1997
24.3
30.1
27.4
405
437
419
7.8
8.0
7.9
6.5
  9.1
  7.7
Sept. 1997
22.0
29.2
26.4
401
423
411
7.7
8.0
7.8
6.2
  9.3
  7.5
Oct. 1997
15.3
26.7
21.4
379
421
407
7.7
8.0
7.9
7.2
10.8
  8.7
Nov. 1997
12.2
20.1
16.3
407
421
416
7.9
8.1
8.0
8.7
12.7
10.7
Dec. 1997
  7.9
16.2
12.2
407
425
416
7.9
8.0
7.9
9.8
14.1
11.8
Jan. 1998
10.7
18.0
14.0
128
415
397
7.8
8.2
8.0
8.2
12.5
  9.8
Feb. 1998
12.5
20.3
15.5
290
435
423
7.9
8.1
8.0
6.7
  9.7
  8.1
Mar. 1998
12.4
23.8
17.2
384
431
415
8.0
8.1
8.1
6.7
10.6
  8.3
Apr. 1998
16.6
25.1
21.0
404
417
412
7.7
8.1
8.0
6.9
  9.9
  8.3
May 1998
20.5
30.3
25.3
394
416
406
7.8
8.3
7.9
5.9
  9.0
  7.4
June 1998
24.0
31.9
28.1
367
410
395
7.7
8.1
7.9
5.4
  9.4
  7.1
July 1998
26.4
32.5
29.3
377
400
389
7.6
8.0
7.8
--
--
--
Aug. 1998
24.9
32.6
28.3
342
413
387
7.7
8.2
8.0
--
--
--

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