The heat units in the table below are based on 60 degrees.

Weather Information from Mathis Field at San Angelo, TX (1948 - 2006)
Year
Rain
Jan. 1-
May 14
(inches)
Rain
May 15 -
May 31
(inches)
Heat Units
May 15 -
May 31
Rain
June
(inches)
Heat Units
June
Rain
July
(inches)
Heat Units
July
Rain
Aug.
(inches)
Heat Units
Aug.
Rain
Sept.
(inches)
Heat Units
Sept.
Rain
Oct.
(inches)
Heat Units
Oct.
Rain
Nov.
(inches)
Heat Units
Nov.
Rain
Dec.
(inches)
Heat Units
for
Growing
Season
Date of Killing Freeze below
30 degrees F
Rain
for
Year
(inches)
1948
2.75
1.19
292.0
1.82
668.5
3.44
684.0
0.16
731.0
1.10
435.5
1.42
175.5
0.49
27.5
0.14
2985.5
November 28 -- 26 degrees
12.51
1949
10.89
0.95
277.5
2.73
586.5
0.78
720.5
1.52
628.5
2.37
449.5
3.75
204.0
0.0
64.0
1.52
2938.0
December 15 -- 23 degrees
24.51
1950
4.61
1.74
241.5
1.28
567.0
0.84
671.5
2.44
631.0
4.3
466.5
0.06
325.5
0.0
16.0
0.0
2919.0
November 4 -- 24 degrees
15.27
1951
1.63
1.09
304.5
4.29
640.5
0.75
796.5
2.37
776.5
1.26
543.0
0.14
309.5
0.16
0.0
0.31
3370.5
November 2 -- 25 degrees
12.00
1952
2.65
2.13
201.0
0.07
675.5
1.10
713.5
0.05
873.5
0.89
449.5
0.0
188.5
1.56
32.0
0.56
3133.5
November 11 -- 29 degrees
9.01
1953
8.55
0.08
342.0
0.65
793.5
3.60
756.0
1.80
669.5
1.24
520.5
4.95
212.0
0.06
14.5
0.13
3308.0
November 22 -- 28 degrees
21.06
1954
4.16
3.92
256.0
0.50
612.5
0.17
758.5
0.12
758.5
0.24
592.5
0.44
302.0
0.28
0.0
0.05
3280.0
November 5 -- 28 degrees
9.88
1955
2.42
2.37
258.5
3.06
602.0
2.37
672.0
0.68
673.5
1.43
535.5
0.08
270.0
0.44
59.5
0.02
3071.0
November 17 -- 28 degrees
12.87
1956
2.60
0.25
281.5
0.07
720.5
0.21
759.5
0.75
754.5
0.48
540.5
2.14
303.0
0.42
18.5
0.49
3378.0
November 17 -- 29 degrees
7.41
1957
9.56
3.37
217.5
1.74
544.5
0.05
776.5
0.53
763.0
2.38
407.0
2.55
151.0
1.65
0.0
0.33
2859.5
October 27 -- 29 degrees
22.16
1958
8.78
0.39
250.5
1.14
625.5
0.21
740.0
2.07
711.5
3.20
458.5
1.86
168.5
0.66
36.5
0.04
2991.0
November 19 -- 26 degrees
18.35
1959
4.07
0.56
288.0
4.17
586.0
7.21
584.5
0.0
676.0
9.20
553.5
5.29
170.5
1.30
21.5
2.06
2880.0
November 6 -- 24 degrees
33.86
1960
4.18
1.85
300.0
0.46
764.5
1.53
801.0
0.51
767.5
0.69
577.0
3.70
362.0
0.21
71.0
1.61
3643.0
November 29 -- 29 degrees
14.74
1961
5.18
2.41
284.0
5.82
569.0
0.81
614.0
1.02
631.0
2.95
443.0
1.94
196.0
1.15
19.5
0.11
2756.5
December 12 -- 21 degrees
21.39
1962
3.20
0.26
347.5
0.74
632.0
1.96
816.0
0.59
833.0
1.85
565.0
0.72
381.5
0.75
36.5
0.46
3611.5
December 11 -- 27 degrees
10.53
1963
2.23
3.50
279.5
2.85
633.5
0.0
841.0
1.55
780.0
1.08
546.0
0.32
338.0
2.13
59.5
0.29
3477.5
December 3 -- 27 degrees
13.95
1964
4.95
0.41
290.0
0.16
694.0
0.47
833.5
1.35
824.0
2.80
513.0
0.63
158.5
1.14
90.5
0.27
3403.5
November 22 -- 26 degrees
12.18
1965
5.78
1.18
229.5
2.01
641.5
0.26
798.0
2.71
702.5
1.18
555.0
2.11
193.5
0.39
100.0
0.63
3220.0
November 29 -- 28 degrees
16.25
1966
4.74
0.86
330.5
0.77
628.0
0.09
837.5
5.05
651.5
2.41
422.0
1.90
136.5
0.0
0.0
0.0
3006.0
November 2 -- 22 degrees
15.82
1967
1.08
1.88
216.0
2.42
698.0
0.59
758.5
1.43
711.5
7.21
377.0
1.82
220.5
2.41
4.0
1.14
2985.5
November 4 -- 28 degrees
19.98
1968
9.63
0.39
281.0
4.71
578.5
1.23
696.0
1.87
747.5
1.81
430.5
0.11
299.0
3.55
32.0
0.0
3064.5
November 11 -- 29 degrees
23.30
1969
8.90
1.53
239.5
0.26
659.0
0.62
852.0
2.96
770.5
5.74
455.0
6.59
203.5
1.20
58.5
2.24
3237.5
November 19 -- 24 degrees
30.04
1970
5.55
1.19
240.5
0.39
566.0
0.0
722.0
0.47
787.0
4.28
561.0
0.94
123.5
0.0
0.0
0.06
3063.0
November 3 -- 29 degrees
12.88
1971
4.31
1.42
304.5
1.72
625.0
1.84
707.5
8.13
475.5
3.59
427.5
2.09
215.0
0.27
58.0
0.88
2813.0
December 3 -- 29 degrees
24.25
1972
4.77
1.26
216.5
4.21
631.5
0.17
722.5
3.66
617.5
5.30
544.5
3.22
250.5
0.31
21.5
0.03
3004.5
November 15 -- 29 degrees
22.93
1973
7.68
0.28
274.5
2.75
566.0
1.06
721.5
0.36
699.5
4.22
453.5
2.03
220.0
0.03
102.5
0.0
3037.5
November 29 -- 28 degrees
18.41
1974
3.48
1.42
332.0
0.16
625.0
1.54
743.5
4.77
607.5
6.11
276.0
4.82
206.0
1.40
46.0
1.40
2836.0
November 30 -- 23 degrees
25.10
1975
6.96
1.01
210.5
2.32
590.0
2.66
576.0
0.38
638.5
2.25
354.0
3.37
185.5
2.19
51.5
0.55
2606.0
November 21 -- 26 degrees
21.69
1976
5.82
0.12
215.5
0.41
591.5
3.51
502.5
1.41
639.0
4.66
412.5
4.66
412.5
0.58
3.50
0.18
2445.5
November 12 -- 28 degrees
21.80
1977
8.37
0.73
292.0
0.47
668.0
0.52
767.0
0.38
810.0
0.27
704.0
1.38
297.0
0.68
7.0
0.15
3545.0
November 10 -- 28 degrees
12.95
1978
3.71
1.04
329.0
2.81
609.5
0.41
778.5
2.93
602.0
1.35
438.5
0.42
170.0
1.75
46.0
0.25
2973.5
December 3 -- 27 degrees
14.67
1979
6.49
0.57
253.5
2.15
538.5
1.30
725.5
2.18
631.5
0.06
454.0
0.93
327.5
0.0
14.5
2.70
2945.0
November 11 -- 24 degrees
16.38
1980
4.41
3.17
232.5
3.14
678.0
0.33
831.5
3.30
755.0
11.0
507.5
0.01
192.0
2.53
0.0
2.20
3196.5
October 30 -- 29 degrees
30.09
1981
8.63
4.24
214.5
1.97
533.5
2.68
683.5
1.23
620.0
2.72
427.0
8.68
213.0
0.0
0.5
0.02
2692.0
November 10 -- 27 degrees
30.17
1982
5.91
2.08
216.5
6.01
534.5
0.35
719.0
0.46
762.5
0.09
520.5
1.26
225.0
1.11
12.0
0.91
2990.0
November 4 -- 26 degrees
18.18
1983
4.77
0.33
215.0
3.72
498.5
1.18
687.5
0.03
683.5
0.0
523.0
3.47
317.5
1.78
118.0
0.07
3043.0
November 27 -- 27 degrees
15.35
1984
3.64
0.54
276.0
2.82
669.5
0.60
665.5
0.26
706.0
2.99
408.5
3.74
182.0
1.09
34.5
3.48
2942.0
November 22 -- 28 degrees
19.16
1985
5.27
3.93
265.0
3.55
524.5
1.13
633.0
0.24
757.5
2.84
482.0
5.64
225.5
0.48
75.5
0.01
2963.0
December 1 -- 28 degrees
23.09
1986
3.58
5.24
198.0
3.30
539.5
0.74
721.5
2.50
661.5
7.53
537.5
5.72
146.0
1.83
10.5
2.48
2814.5
November 13 -- 25 degrees
32.92
1987
9.71
9.73
204.0
3.28
479.0
0.22
624.5
1.91
695.5
3.86
387.5
0.34
206.5
0.80
48.0
2.05
2645.0
November 10 -- 27 degrees
31.90
1988
4.47
1.32
198.0
2.14
573.5
1.22
641.0
0.92
676.0
3.20
462.5
0.0
190.5
0.0
84.0
0.79
2825.5
November 17 -- 28 degrees
14.06
1989
6.57
0.27
370.5
2.83
537.0
0.35
717.5
2.78
677.5
2.82
376.0
0.41
180.5
0.48
0.0
0.23
2859.0
October 31 -- 29 degrees
16.74
1990
10.03
2.26
336.5
0.05
753.0
4.09
590.0
1.05
618.5
6.23
450.5
2.40
165.5
2.51
67.5
0.21
2981.5
November 29 -- 28 degrees
28.83
1991
3.50
1.08
324.5
4.22
554.0
1.80
664.5
1.36
628.0
4.77
377.0
3.34
234.0
0.24
0.0
3.98
2782.0
November 2 -- 28 degrees
24.29
1992
8.07
1.16
151.0
4.74
576.5
1.98
714.0
1.78
597.5
0.27
528.5
1.33
262.5
0.95
0.0
0.75
2830.0
November 5 -- 27 degrees
21.03
1993
4.76
2.62
248.5
0.94
636.0
0.82
800.0
2.64
755.5
1.99
420.5
1.07
220.5
0.05
0.0
0.76
3081.0
October 31 -- 26 degrees
15.65
1994
6.05
0.28
269.5
1.04
724.0
0.25
798.0
1.30
744.5
3.04
432.5
4.27
237.0
1.96
53.5
1.21
3259.0
November 30 -- 23 degrees
19.40
1995
7.74
3.47
257.0
1.37
526.0
0.17
751.0
2.41
690.5
2.27
481.5
1.86
200.5
1.68
29.5
0.20
2948.5
December 9 -- 22 degrees
21.17
1996
4.11
0.92
385.0
1.81
669.0
0.26
787.5
7.66
661.5
1.92
401.0
2.42
186.0
3.35
49.5
0.05
3139.5
November 24 -- 28 degrees
22.50
1997
10.96
1.83
215.0
2.57
515.0
0.74
738.5
2.76
703.0
1.56
556.5
0.82
225.0
0.76
0.0
1.38
2953.0
November 11 -- 24 degrees
23.38
1998
3.08
1.75
377.0
0.88
727.5
0.46
848.0
2.77
648.0
0.10
564.0
2.39
261.0
1.06
43.0
0.49
3480.5
December 8 -- 26 degrees
12.98
1999
5.01
1.33
284.5
4.70
587.0
0.66
701.5
0.03
779.5
0.66
519.5
0.94
234.0
0.00
67.5
0.09
3173.5
November 25 -- 27 degrees
13.42
2000
1.65
2.21
374.5
3.44
603.0
0.02
841.5
0.00
799.5
0.58
558.5
3.61
261.5
3.08
6.0
0.60
3444.5
November 14 -- 27 degrees
15.19
2001
8.01
0.05
311.0
0.26
707.5
0.57
848.0
3.67
716.0
0.89
434.5
1.48
188.5
3.46
84.5
0.14
3290.0
November 27 -- 29 degrees
18.53
2002
3.08
0.43
266.5
0.88
648.5
2.02
648.5
0.41
762.0
1.64
476.0
4.06
176.5
0.52
16.5
1.37
2994.5
November 28 -- 26 degrees
14.41
2003
3.21
1.07
272.5
4.78
554.0
0.90
685.0
2.52
721.0
3.16
419.0
3.38
207.5
0.74
92.5
0.00
2952.0
November 24 -- 18 degrees
19.76
2004
7.29
0.27
308.5
3.65
604.5
2.18
662.0
4.32
605.5
2.05
438.0
5.16
243.0
5.18
6.5
0.38
2868.0
November 30 -- 29 degrees
30.48
2005
6.85
3.00
253.0
0.98
604.5
1.15
708.5
4.66
621.5
0.02
577.5
3.72
205.5
0.00
69.5
0.02
3040.0
November 16 -- 23 degrees
20.40
2006
4.43
1.53
331.5
0.30
666.0
0.87
751.0
4.87
777.0
2.60
420.5
2.21
237.0
0.01
40.0
0.83
3223.0
November 16 -- 28 degrees
17.65

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The original data is contained in four txt files (sanangelo1948-67dailymaxairminairrain.txt, sanangelo1968-87dailymaxairminairrain.txt, sanangelo1988-2002dailymaxairminairrain.txt, and sanangelo2003-2006dailymaxairminairrain.txt).