Crestone Weather Center
- Keno's Home and Crestone's Official Weather Station -

DAILY CLIMATOLOGICAL SUMMARY FOR CRESTONE, CO

2009

(For 2009 Monthly Climatological Stats, go here)

January February March April May June
July August September October November December

Temperatures recorded in Fahrenheit, precipitation recorded in inches. Heating/Cooling degree base: 65.0
Summary shown by bottom of each month is for total precip, snowfall and heating/cooling degrees. All other totals are averages.

(Full glossary and * is here)


- Observed Daily Data -

January 2009

Day MaxT MinT AvgT HDD CDD Pcpn Snow Snwg*
1 32    6    19.0 46 0 0.00 0.0 10
2 35    9   22.0 43 0   0.00  0.0 10
3 39  21   30.0 35 0   T  T   9
4 27 17   22.0 43 0   0.19  3.5 13
5 24   5   14.5 50 0   T  T 12
6 26   0   13.0 52 0   0.00  0.0 12
7 33   6   19.5 45 0   0.00  0.0 12
8 34   7   20.5 44 0   0.00  0.0 11
9 38 10   24.0 41 0   0.03  0.7 12
10 24    1   12.5 52 0   0.00  0.0 11
11 30   -1   14.5 50 0   0.00  0.0 11
12 36    8   22.0 43 0 T T 11
13 31  12   21.5 43 0   0.00  0.0 11
14 32    5   18.5 46 0   0.00  0.0 10
15 32    7   19.5 45 0   0.00  0.0 10
16 31    5   18.0 47 0   0.00  0.0 10
17 32    4   18.0 47 0   0.00  0.0 10
18 31    1   16.0 49 0   0.00  0.0 10
19 33    7   20.0 45 0   0.00  0.0 10
20 35    7   21.0 44 0   0.00  0.0 10
21 31    3   17.0 48 0   0.00  0.0 10
22 41    9   25.0 40 0   0.00  0.0 10
23 41   24   32.5 32 0 T T   9
24 44   22   33.0 32 0 T T   9
25 42   27   34.5 30 0   0.00  0.0   8
26 38   17   27.5 37 0 T T   8
27 26    2   14.0 51 0   0.00  0.0   8
28 31   -1   15.0 50 0   0.00  0.0   8
29 27    4   15.5 49 0   0.00  0.0   8
30 29    3   16.0 49 0   0.00  0.0   8
31 31    3   17.0 48 0   0.00  0.0   8
Day MaxT MinT AvgT HDD CDD Pcpn Snow Snwg*
Smry/Ave 32.8   8.1   20.4 1376 0 0.22 4.2 10.0

February 2009

Day MaxT MinT AvgT HDD CDD Pcpn Snow Snwg*
1 35    7    21.0 44 0 0.00 0.0 8
2 32    8   20.0 45 0   0.00  0.0 7
3 38  11   24.5 40 0   0.00  0.0 7
4 37    9   23.0 42 0   0.00  0.0 7
5 39 10   24.5 40 0   0.00  0.0 6
6 42 16   29.0 36 0   0.00  0.0 6
7 49 18   33.5 31 0   0.00  0.0 6
8 47 19   33.0 32 0   0.12  0.9 7
9 37 13   25.0 40 0   0.01  0.1 7
10 37 12   24.5 40 0   0.03  0.5 7
11 34    5   19.5 45 0   0.00  0.0 7
12 38    9   23.5 41 0   0.00  0.0 7
13 33    7   20.0 45 0   0.04  0.7 7
14 34 12   23.0 42 0   T  T 7
15 32    3   17.5 47 0   0.00  0.0 7
16 42  15   28.5 36 0   0.00  0.0 7
17 36  16   26.0 39 0   0.00  0.0 7
18 37  10   23.5 41 0   0.00  0.0 7
19 38    8   21.5 43 0   0.00  0.0 7
20 40    4   22.0 43 0   0.00  0.0 7
21 40   12   26.0 39 0   0.00  0.0 6
22 44   13   28.5 36 0   0.00  0.0 6
23 52   26   39.0 26 0   T  0.0 5
24 52   26   39.0 26 0 0.00 0.0 4
25 54   20   37.0 28 0 0.00 0.0 3
26 49   23   36.0 29 0 0.00 0.0 1
27 44   14   29.0 36 0 0.00 0.0 1
28 43     8   25.5 39 0 0.00 0.0 1
Day MaxT MinT AvgT HDD CDD Pcpn Snow Snwg*
Smry/Ave 40.4 12.6   26.5 1071 0 0.20 2.2 5.9

March 2009

Day MaxT MinT AvgT HDD CDD Pcpn Snow Snwg*
1 51 14    32.5 32 0 0.00 0.0 T
2 59 21    40.0 25 0 0.00 0.0 T
3 58 25    41.5 23 0 0.00 0.0 T
4 59 32    45.5 19 0 0.00 0.0 T
5 50 28    39.0 26 0 0.00 0.0 T
6 50 29    39.5 25 0 0.02 0.2 T
7 42 19    30.5 34 0 0.02 0.3 T
8 50   9    29.5 35 0 0.00 0.0 T
9 51 27    39.0 26 0 0.00 0.0 T
10 39 19    29.0 36 0 T 0.1 T
11 52   9    30.5 34 0 0.00 0.0 T
12 50 18    34.0 31 0 T 0.2 T
13 45 19    32.0 33 0 T T T
14 48 12    30.0 35 0 0.00 0.0 T
15 52 16    34.0 31 0 0.00 0.0 T
16 59 19    39.0 26 0 0.00 0.0 0
17 63 22    42.5 22 0 0.00 0.0 0
18 63 24    43.5 21 0 0.00 0.0 0
19 63 26    44.5 20 0 0.00 0.0 0
20 65 30    47.5 17 0 0.00 0.0 0
21 67 27    47.0 18 0 0.00 0.0 0
22 64 36    50.0 15 0 0.00 0.0 0
23 47 26    36.5 28 0 T 0.1 0
24 49 18    33.5 31 0 0.07 1.9 1
25 42 19    30.5 34 0 0.04 0.7 T
26 38 12    25.0 40 0 0.44 7.0 6
27 36   7    21.5 43 0 0.02 0.4 2
28 45 11    28.0 37 0 0.00 0.0 1
29 55 19    37.0 28 0 0.00 0.0 T
30 31   8    19.5 45 0 0.16 3.1 2
31 39   8   23.5 41 0 0.00 0.0 T
Day MaxT MinT AvgT HDD CDD Pcpn Snow Snwg*
Smry/Ave 51.0 19.6   35.3 911 0 0.77 14.0 0.4

April 2009

Day MaxT MinT AvgT HDD CDD Pcpn Snow Snwg*
1 38 13    25.5 39 0 0.07 0.3 T
2 49   8    28.5 36 0 0.00 0.0 T
3 56 31    43.5 21 0 T T T
4 39 21    30.0 35 0 0.05 0.4 T
5 46   9    27.5 37 0 0.00 0.0 0
6 53  10    31.5 33 0 0.00 0.0 0
7 61  17    39.0 26 0 0.00 0.0 0
8 65  24    44.5 20 0 0.00 0.0 0
9 52  26    39.0 26 0 0.00 0.0 0
10 58  19    38.5 26 0 0.00 0.0 0
11 47  27    37.0 26 0 0.25 0.9 T
12 41  27    34.0 31 0 1.33 26.8 15
13 45  20    32.5 32 0 0.00 0.0 7
14 55  23    39.0 26 0 0.00 0.0 3
15 55  33    44.0 21 0 T T T
16 51  27    39.0 26 0 0.03 0.5 T
17 41  16    28.5 36 0 1.22 17.5 12
18 43  16    29.5 35 0 0.07 0.9 7
19 51  19    35.0 30 0 0.00 0.0 4
20 59  27    43.0 22 0 0.00 0.0 1
21 68  29    48.5 16 0 0.00 0.0 T
22 68  31    49.5 15 0 0.00 0.0 T
23 68  29    48.5 16 0 0.00 0.0 0
24 69  33    51.0 14 0 0.00 0.0 0
25 65  38    51.5 13 0 0.00 0.0 0
26 55  26    40.5 24 0 0.01 T 0
27 61  25    43.0 22 0 0.00 0.0 0
28 66  39    52.5 12 0 0.00 0.0 0
29 70  33    51.5 13 0 0.00 0.0 0
30 72  28    50.0 15 0 0.00 0.0 0
Day MaxT MinT AvgT HDD CDD Pcpn Snow Snwg*
Smry/Ave 55.6 24.1    39.9 746 0 3.03 47.3 1.6

May 2009

Day MaxT MinT AvgT HDD CDD Pcpn Snow Snwg*
1 74 35    54.5 10 0 0.00 0.0 0
2 59 40    49.5 15 0 0.12 0.0 0
3 58 34    46.0 19 0 0.04 0.0 0
4 60 36    48.0 17 0 0.04 T 0
5 69 38    53.5 11 0 0.00 0.0 0
6 77 37    57.0   8 0 0.00 0.0 0
7 79 41    60.0   5 0 0.00 0.0 0
8 75 44    58.5   6 0 0.00 0.0 0
9 75 32   53.5  11 0 0.00 0.0 0
10 71 43   57.0   8 0 0.00 0.0 0
11 76 39   57.5   7 0 T 0.0 0
12 77 38   57.5   7 0 0.00 0.0 0
13 74 41   57.5   7 0 0.00 0.0 0
14 75 36   55.5   9 0 T 0.0 0
15 72 39   55.5   9 0 0.00 0.0 0
16 70 44   55.0   10 0 0.00 0.0 0
17 77 33   55.0   10 0 0.00 0.0 0
18 80 41   60.5    4 0 0.00 0.0 0
19 78 47   62.5    2 0 0.00 0.0 0
20 71 41   56.0    9 0 0.00 0.0 0
21 66 44   55.0   10 0 0.57 0.0 0
22 63 42   52.5   12 0 0.35 0.0 0
23 62 44   53.0   12 0 0.22 0.0 0
24 60 39   49.5   15 0 0.40 0.0 0
25 64 38   51.0   14 0 T 0.0 0
26 60 34   47.0   18 0 0.07 0.0 0
27 63 36   49.5   15 0 0.16 0.0 0
28 68 32   50.0   15 0 T 0.0 0
29 70 35   52.5   12 0 0.02 0.0 0
30 71 35   53.0   12 0 0.08 0.0 0
31 70 40   55.0   10 0 T 0.0 0
Day MaxT MinT AvgT HDD CDD Pcpn Snow Snwg*
Smry/Ave 69.8 38.5    54.1 329 0 2.07 0.0 0

June 2009

Day MaxT MinT AvgT HDD CDD Pcpn Snow Snwg*
1 65 36    50.5 14 0 0.36 0.0 0
2 61 42    51.5 13 0 0.19 0.0 0
3 66 41    53.5 11 0 0.01 0.0 0
4 71 36    53.5 11 0 0.00 0.0 0
5 72 44    58.0   7 0 0.02 0.0 0
6 71 41    56.0   9 0 0.00 0.0 0
7 65 37    51.0 14 0 0.00 0.0 0
8 70 33    51.5 13 0 0.00 0.0 0
9 69 46    57.5    7 0 0.00 0.0 0
10 57 39    48.0  17 0 0.40 0.0 0
11 68 36    52.0  13 0 0.00 0.0 0
12 71 36    53.5  11 0 0.00 0.0 0
13 77 39    58.0    7 0 0.00 0.0 0
14 72 38    55.0   10 0 T 0.0 0
15 72 42    57.0     8 0 0.00 0.0 0
16 72 39    55.5     9 0 0.00 0.0 0
17 78 40    59.0     6 0 0.00 0.0 0
18 75 43    59.0     6 0 0.00 0.0 0
19 78 38    58.0     7 0 0.00 0.0 0
20 59 45    52.0   13 0 0.16 0.0 0
21 76 40    58.0      7 0 0.00 0.0 0
22 81 46    63.5      1 0 0.00 0.0 0
23 80 46    63.0      2 0 0.00 0.0 0
24 84 48    66.0      0 1 0.01 0.0 0
25 81 53    67.0      0 2 0.75 0.0 0
26 71 46    58.5      6 0 0.55 0.0 0
27 76 42    59.0      6 0 0.00 0.0 0
28 78 47    62.5      2 0 0.01 0.0 0
29 80 45    62.5      2 0 T 0.0 0
30 82 47    64.5      0 0 0.00 0.0 0
Day MaxT MinT AvgT HDD CDD Pcpn Snow Snwg*
Smry/Ave 72.6 41.7   57.0  232 3 2.46 0.0 0

July 2009

Day MaxT MinT AvgT HDD CDD Pcpn Snow Snwg*
1 83 47    65.0 0 0 0.00 0.0 0
2 82 47    64.5 0 0 0.07 0.0 0
3 74 51    62.5 2 0 0.00 0.0 0
4 80 47    63.5 1 0 T 0.0 0
5 78 49    63.5 1 0 0.00 0.0 0
6 76 46    61.0 4 0 0.03 0.0 0
7 83 43    63.0 2 0 0.00 0.0 0
8 85 46    65.5 0 1 0.00 0.0 0
9 86 46    66.0 0 1 0.00 0.0 0
10 87 52    69.5 0 5 0.02 0.0 0
11 87 47    67.0 0 2 0.00 0.0 0
12 87 51    69.0 0 4 T 0.0 0
13 86 48    67.0 0 2 T 0.0 0
14 85 46    65.5 0 1 0.00 0.0 0
15 81 48    64.5 0 0 T 0.0 0
16 89 47    68.0 0 3 0.00 0.0 0
17 88 47    67.5 0 3 0.00 0.0 0
18 89 48    68.5 0 4 0.00 0.0 0
19 89 48    68.5 0 4 T 0.0 0
20 86 51    68.5 0 4 0.00 0.0 0
21 81 48    64.5 0 0 0.05 0.0 0
22 80 42    61.0 4 0 T 0.0 0
23 84 49    66.5 0 2 0.01 0.0 0
24 90 53    71.5 0 7 0.00 0.0 0
25 90 53    71.5 0 7 T 0.0 0
26 77 48    62.5 2 0 0.33 0.0 0
27 82 44    63.0 2 0 0.00 0.0 0
28 84 46    65.0 0 0 T 0.0 0
29 79 45    62.0 3 0 T 0.0 0
30 78 47    62.5 2 0 0.02 0.0 0
31 72 44    58.0 7 0 0.17 0.0 0
Day MaxT MinT AvgT HDD CDD Pcpn Snow Snwg*
Smry/Ave 83.2 47.5    65.4 30 50 0.70 0.0 0

August 2009

Day MaxT MinT AvgT HDD CDD Pcpn Snow Snwg*
1 80 41    60.5 4 0 0.00 0.0 0
2 83 44    63.5 1 0 T 0.0 0
3 85 46    65.5 0 1 0.00 0.0 0
4 86 48    67.0 0 2 0.00 0.0 0
5 89 48    68.5 0 4 0.02 0.0 0
6 84 53    68.5 0 4 0.00 0.0 0
7 81 51    66.0 0   1 0.00 0.0 0
8 80 44    62.0 3   0 0.00 0.0 0
9 81 36    58.5 6   0 0.00 0.0 0
10 82 41    61.5 3   0 0.00 0.0 0
11 84 44    64.0 1   0 0.00 0.0 0
12 86 46    66.0 0   1 0.00 0.0 0
13 84 49    66.5 0   2 0.00 0.0 0
14 70 47    58.5 6   0 0.25 0.0 0
15 77 41    59.0 6   0 0.00 0.0 0
16 78 42    60.0 5   0 0.00 0.0 0
17 82 37    59.5 5   0 0.00 0.0 0
18 80 41    60.5 4   0 0.00 0.0 0
19 81 40    60.5 4   0 0.00 0.0 0
20 85 44    64.5 0   0 0.00 0.0 0
21 87 48    67.5 0   3 0.00 0.0 0
22 88 52    70.0 0   5 0.00 0.0 0
23 83 51    67.0 0   2 0.00 0.0 0
24 60 47    53.5 12   0 0.29 0.0 0
25 71 43    57.0 8   0 0.00 0.0 0
26 78 41    59.5 5   0 0.00 0.0 0
27 77 42   59.5 5   0 0.00 0.0 0
28 82 43    62.5 2   0 0.00 0.0 0
29 83 47    65.0 0   0 0.04 0.0 0
30 76 46    61.0 4   0 T 0.0 0
31 77 45    61.0 4   0 0.00 0.0 0
Day MaxT MinT AvgT HDD CDD Pcpn Snow Snwg*
Smry/Ave 80.6 44.8    62.7 88 25 0.60 0.0 0

September 2009

Day MaxT MinT AvgT HDD CDD Pcpn Snow Snwg*
1 81 46    63.5 1 0 0.00 0.0 0
2 82 46    64.0 1 0 0.00 0.0 0
3 77 47    62.0 3 0 T 0.0 0
4 81 42    61.5 3 0 0.21 0.0 0
5 73 38    55.5 9 0 0.01 0.0 0
6 75 45    60.0 5 0 0.00 0.0 0
7 78 42    60.0 5 0 0.01 0.0 0
8 78 44    61.0 4 0 0.00 0.0 0
9 78 42    60.0 5 0 0.04 0.0 0
10 72 42    57.0 8 0 0.00 0.0 0
11 77 38    57.5 7 0 0.00 0.0 0
12 67 39    53.0 12 0 0.08 0.0 0
13 71 42    56.5 8 0 0.10 0.0 0
14 77 39    58.0 7 0 T 0.0 0
15 76 39    57.5 7 0 0.00 0.0 0
16 66 44    55.0 10 0 0.05 0.0 0
17 67 40    53.5 11 0 0.14 0.0 0
18 72 37    54.5 10 0 T 0.0 0
19 74 37    55.5 9 0 T 0.0 0
20 69 36    52.5 12 0 0.01 0.0 0
21 56 32    44.0 21 0 T T 0
22 51 22    36.5 28 0 0.00 0.0 0
23 50 31    40.5 24 0 T T 0
24 53 28    40.5 24 0 T T 0
25 65 31    48.0 17 0 0.00 0.0 0
26 75 31    53.0 12 0 0.00 0.0 0
27 77 36    56.5 8 0 0.00 0.0 0
28 75 35    55.0 10 0 0.00 0.0 0
29 76 34    55.0 10 0 0.00 0.0 0
30 68 34    51.0 14 0 0.01 0.0 0
Day MaxT MinT AvgT HDD CDD Pcpn Snow Snwg*
Smry/Ave 71.2 38.0    54.6 305 0   0.66 0.0 0

October 2009

Day MaxT MinT AvgT HDD CDD Pcpn Snow Snwg*
1 49 25    37.0 28 0 0.00 0.0 0
2 58 20    39.0 26 0 0.00 0.0 0
3 65 24    44.5 20 0 0.00 0.0 0
4 66 41    53.5 11 0 T 0.0 0
5 61 34    47.5 17 0 0.00 0.0 0
6 58 21    39.5 25 0 0.00 0.0 0
7 55 31    43.0 22 0 0.12 0.0 0
8 52 32    42.0 23 0 0.15 0.1 0
9 58 25    41.5 23 0 0.00 0.0 0
10 64 27    44.5 19 0 0.00 0.0 0
11 63 35    49.0 16 0 0.00 0.0 0
12 63 31    47.0 18 0 0.00 0.0 0
13 61 38    49.5 15 0 0.16 0.0 0
14 67 38    52.5 12 0 0.00 0.0 0
15 63 36    49.5 15 0 0.00 0.0 0
16 65 28    46.5 18 0 0.00 0.0 0
17 64 29    48.5 18 0 0.00 0.0 0
18 68 31    49.5 15 0 0.00 0.0 0
19 70 38    54.0 11 0 0.00 0.0 0
20 65 33    49.0 16 0 0.07 0.0 0
21 39 29    34.0 31 0 0.24 1.7 1
22 48 24    36.0 29 0 0.00 0.0 0
23 52 23    37.5 27 0 0.00 0.0 0
24 57 29    43.5 22 0 0.00 0.0 0
25 49 23    36.0 29 0 0.01 0.1 0
26 45 12    28.5 36 0 0.00 0.0 0
27 48 19    33.5 31 0 0.00 0.0 0
28 36 19    27.5 37 0 0.17 4.4 4
29 28 14    21.0 44 0 0.55 5.9 6
30 34   4    19.0 46 0 T T 4
31 43 14    28.5 36 0 0.00 0.0 2
Day MaxT MinT AvgT HDD CDD Pcpn Snow Snwg*
Smry/Ave 55.3 26.7    41.0 736 0 1.47 12.2 0.6

November 2009

Day MaxT MinT AvgT HDD CDD Pcpn Snow Snwg*
1 51 20    35.5 29 0 0.00 0.0 2
2 52 22    37.0 28 0 0.00 0.0 1
3 56 22    39.0 26 0 0.00 0.0 T
4 58 23    40.5 24 0 0.00 0.0 T
5 58 26    42.0 23 0 0.00 0.0 0
6 61 28    44.5 20 0 0.00 0.0 0
7 63 32    47.5 17 0 0.00 0.0 0
8 56 29    42.5 22 0 0.00 0.0 0
9 55 29    42.0 23 0 0.00 0.0 0
10 56 24    40.0 25 0 0.00 0.0 0
11 55 27    41.0 24 0 0.00 0.0 0
12 56 32    44.0 21 0 0.00 0.0 0
13 53 32    42.5 22 0 0.00 0.0 0
14 47 29    38.0 27 0 T T T
15 35 15    25.0 40 0 0.09 1.8 1
16 35   7    21.0 44 0 0.00 0.0 T
17 44   8    26.0 39 0 0.00 0.0 T
18 48 12    30.0 35 0 0.00 0.0 0
19 47 15    31.0 34 0 0.00 0.0 0
20 46 13    29.5 35 0 0.00 0.0 0
21 48 17    32.5 32 0 0.00 0.0 0
22 44 14    29.0 36 0 0.00 0.0 0
23 32   7    19.5 45 0 0.00 0.0 0
24 35   3    19.0 46 0 0.00 0.0 0
25 44   8    26.0 39 0 0.00 0.0 0
26 49   14    31.5 33 0 0.00 0.0 0
27 49   14    31.5 33 0 0.00 0.0 0
28 43   18    30.5 34 0 0.00 0.0 0
29 44   17    30.5 34 0 0.00 0.0 0
30 43   10    26.5 38 0 0.00 0.0 0
Day MaxT MinT AvgT HDD CDD Pcpn Snow Snwg*
Smry/Ave 48.8 18.9    33.8 928 0 0.09 1.8 0.1

December 2009

Day MaxT MinT AvgT HDD CDD Pcpn Snow Snwg*
1 44    9    26.5 38 0 0.00 0.0 0
2 36    9    22.5 42 0 0.00 0.0 0
3 23 -3    10.0 58 0 0.00 0.0 0
4 25 -6      9.5 55 0 0.00 0.0 0
5 35 -2     16.5 48 0 0.00 0.0 0
6 32 11     21.5 43 0 0.00 0.0 0
7 31 19     25.0 40 0 0.02 0.4 T
8 33   5     19.0 46 0 0.10 1.9 2
9 21 -5       8.0 57 0 0.00 0.0 2
10 22 -2     10.0 55 0 0.00 0.0 2
11 28 -6     11.0 54 0 0.00 0.0 2
12 35   2     18.5 46 0 0.00 0.0 2
13 39 17     28.0 37 0 0.02 0.5 2
14 32   7     19.5 45 0 0.00 0.0 1
15 31 -1     15.0 50 0 0.00 0.0 1
16 35 4     19.5 45 0 0.00 0.0 1
17 39   7     23.0 42 0 0.00 0.0 1
18 33   7     20.0 45 0 0.00 0.0 1
19 32   1     16.5 48 0 0.00 0.0 1
20 38   9     23.5 41 0 0.00 0.0 1
21 40   8     24.0 41 0 0.00 0.0 1
22 32 18     25.0 40 0 0.13 1.2 2
23 34 16     25.0 40 0 0.01 0.2 2
24 24   2     13.0 52 0 0.02 0.7 3
25 21 -2       9.5 55 0 0.00 0.0 3
26 25   0     12.5 52 0 0.00 0.0 2
27 27 -4     11.5 53 0 0.00 0.0 2
28 28 -4     12.0 53 0 0.00 0.0 2
29 32   9     20.5 44 0 T T 2
30 31 12     21.5 43 0 0.01 0.2 2
31 28   2     15.0 50 0 0.00 0.0 2
Day MaxT MinT AvgT HDD CDD Pcpn Snow Snwg*
Smry/Ave 31.2 4.5    17.8 1455 0 0.31 5.1 1.4

Glossary: MaxT- Maximum Temperature; MinT -  Minimum Temperature; AvgT - Average Temperature; HDD - Heating Degree Days; CDD - Cooling Degree Days; Pcpn - Precipitation; Snwg - Snow on ground; Smry - Summary; T- Trace. *Note: If less than 30% of the ground has snow cover, it is recorded as a trace; if less than 20% of the ground has snow cover, then it is recorded as zero.

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