Note:  The data provided on this page are "unofficial".  The National Climatic Data Center is the official source for climate data. If you have any questions, they may be directed to:  Webmaster  or call (906) 475-5212.

 

Elevation: 673 Feet Above Mean Sea Level
Location: Ontonagon Co Road Commission
Period of Record: 1978 to Present
Period of Normals: 1978 to 2000

Ontonagon 1978 to 2002 Annual Averages 
Year     MaxT    MinT      T        HDD     CDD     Prec       Snow
1978     52.4     29.8     41.0      8900      312      34.03      203.1
1979     50.3     29.0     39.6      9289      218      35.40      187.5
1980     51.9     30.8     41.3      8809      233      36.76      160.6
1981     54.1     32.9     43.5      7983      233      40.10      209.7
1982     51.5     30.7     41.1      8834      206      38.21      195.2
1983     53.2     33.6     43.4      8371      583      37.23      213.3
1984     53.9     32.0     43.0      8261      295      33.21      151.6
1985     51.4     31.1     41.3      8786      205      42.79      294.0
1986     53.9     32.2     43.1      8175      265      33.37      166.5
1987     57.2     35.6     46.4      7174      458      31.33      104.0
1988     54.2     31.7     42.9      8518      532      37.57      268.0
1989     52.4     29.8     41.1      8994      362      29.99      282.0
1990     55.1     32.2     43.7      7957      257      29.75      137.5
1991     54.0     32.7     43.3      8232      418      38.26      193.5
1992     52.1     31.9     42.0      8496      166      29.13      168.5
1993     51.3     31.4     41.4      8819      283      30.62      176.0
1994     51.1     29.9     40.5      8277      174      22.38      124.7
1995     52.3     33.4     42.8      8504      507      36.82      241.5
1996     50.1     29.2     39.7      9431      246      39.52      254.5
1997     52.4     31.1     41.8      8629      252      30.33      183.6
1998     57.0     35.8     46.4      7068      382      29.00      105.0
1999     55.5     34.3     44.9      7668      429      33.88      125.5
2000     54.4     32.8     43.6      8010      274      24.71      186.0
2001     55.8     34.9     45.3      7519      430      33.55      181.5
2002     53.4     33.6     43.5      8253      490      35.51      209.0
________________________________________________________________________
1978 to 2000
AVG   53.1       31.9     42.5      8406      317      33.73      188.4

... January Normals ...

Avg Max Temperature: 24.5

 Avg Heating Degree Days: 1518
Avg Min Temperature: 7.1 Avg Cooling Degree Days: 0
Avg Temperature: 15.8 Avg Precipitation: 2.94
Avg Snowfall: 55.4

... January Records ...
Day Max Yrs Min Yrs Pcp Yrs Snow Yrs
1 36 92 -9 99 0.37 95 12.0 95
2 43 98 -25 79 0.29 95 8.0 95
3 43 84/92 -18 85 0.45 95 8.0 95
4 43 92 -8 79/88 0.78 97 10.0 97
5 39 83/84 -18 79 0.42 97 6.5 97
6 37 84 -10 79 0.30 88 6.0 88
7 47 2003 -27 88 0.67 80 12.0 80
8 53 90 -15 97 0.67 89 11.0 89
9 48 2002 -16 80 0.30 79/98 5.5 79
10 46 2001 -26 88 0.77 82 9.0 82
11 45 86 -19 79 0.50 85 8.0 82
12 42 86/2001 -14 79 0.45 88 9.0 88
13 47 87 -25 99 0.60 86 4.0 93/98
14 43 87 -15 82 0.31 2003 8.0 2003
15 39 90 -22 79 0.60 81 9.0 81
16 42 88 -22 79 0.40 82 9.0 78
17 47 88 -27 82 0.78 80 11.0 2002
18 43 81 -23 94 1.45 96 12.0 96
19 46 81 -28 84 0.26 85 6.0 96
20 38 93 -20 85 0.72 88 9.0 88
21 50 81 -31 84 0.31 85/93 4.0 85
22 47 89 -16 78 0.80 97 7.0 87
23 45 81 -6 87 0.68 82 11.0 82
24 47 81 -6 80 0.25 87/97 9.0 85
25 56 81 -12 96 0.38 85 8.0 2003
26 50 81 -22 96 0.35 2001 7.0 78
27 44 89 -18 97 0.42 90 7.0 96
28 46 89 -17 86 0.28 81 7.0 81
29 43 90 -10 85/2000 0.30 96 8.0 2002
30 45 89/99 -23 94 0.32 96 4.0 87/96
31 48 99 -28 94 0.36 88 3.0 78/96

... February Normals ...

Avg Max Temperature: 29.7

 Avg Heating Degree Days: 1286
Avg Min Temperature: 8.0 Avg Cooling Degree Days: 0
Avg Temperature: 18.8 Avg Precipitation: 1.40
Avg Snowfall: 23.3

... February Records ...
Day Max Yrs Min Yrs Pcp Yrs Snow Yrs
1 40 99 -31 94 0.37 81 9.0 81
2 57 91 -31 85 0.34 81 6.0 87
3 56 91 -28 96 0.55 83 14.0 83
4 52 93 -36 96 0.51 2003 8.0 2003
5 46 90 -21 89 1.00 84 9.0 88
6 52 91 -27 82 0.17 88 4.0 81/83
7 54 91 -16 94 0.34 92 8.5 92
8 52 91 -28 85 0.22 89 6.0 89
9 50 98 -28 79 0.45 2001 8.0 2001
10 48 84 -35 79 0.28 85 5.5 2004
11 47 99 -25 2003 0.52 99 4.5 95
12 40 84/90 -23 81 0.67 99 9.0 99
13 43 83 -23 88 0.19 84 5.0 85
14 49 99 -12 90 0.16 85 5.0 85
15 50 81 -20 2003 0.47 95 9.0 95
16 58 81 -14 79 0.32 90 6.0 90
17 63 81 -42 79 0.14 2001 4.5 99
18 58 94 -27 96 0.34 81 6.0 93
19 55 94 -15 85 0.27 91 4.0 84/2001
20 49 90 -14 93 0.69 86 10.0 86
21 54 81 -17 88 0.41 79 4.5 79
22 61 84 -18 2001 0.48 81 5.5 91
23 53 2000 -4 91 0.53 81 2.5 2004
24 52 2000 -13 86 0.53 81 4.5 80/2002
25 50 98 -23 90 0.42 2001 5.0 78
26 58 2000 -14 93 0.28 89 8.0 89
27 52 83/00/04 -12 91 0.62 96 7.0 96
28 55 04 -19 86 0.31 92 7.0 96
29 62 2000 -19 96 0.00 92/2000 0.3 84

... March Normals ...

Avg Max Temperature: 39.5

 Avg Heating Degree Days: 1125
Avg Min Temperature: 17.4 Avg Cooling Degree Days: 0
Avg Temperature: 28.4 Avg Precipitation: 1.89
  Avg Snowfall: 18.9

... March Records ...
Day Max Yrs Min Yrs Pcp Yrs Snow Yrs
1 58 90 -24 80 0.58 87 7.0 87
2 52 93 -22 89 0.22 04 3.0 81/96
3 52 2000 -28 2003 0.21 78 4.5 78
4 52 2000 -16 96 1.18 79 10.0 79
5 59 2000 -30 2003 0.37 95 6.0 84/85
6 69 2000 -22 2003 0.33 92 1.5 84
7 68 2000 -27 84 0.31 95 4.0 95
8 70 2000 -21 84 0.68 2002 10.0 2002
9 52 85 -15 84/96 0.97 83 11.0 83
10 57 90 -6 96 0.68 86 7.5 83
11 59 95 -6 84 0.53 90 4.0 80
12 65 95 -16 80/84 0.38 90 6.0 88
13 65 95 -10 2003 0.30 88 8.0 88
14 64 90 -15 93 0.60 97 14.0 97
15 67 90 -15 98 0.51 2002 12.0 2002
16 66 2003 -17 97 0.30 80 4.0 93
17 54 79 -12 89 0.32 90 4.0 90
18 56 79 -16 89 0.76 88 6.0 88
19 57 87 -14 89 0.75 86 9.0 86
20 58 87 -21 86 0.49 95 2.5 84
21 55 87 -14 89 0.70 84 7.0 84
22 66 87 -8 89 0.88 84 5.0 84
23 66 87 -2 97 0.96 79 5.5 79
24 69 87 -8 83 0.95 79/94 12.0 79
25 62 87 -10 2002 2.50 96 20.0 96
26 64 89 -9 79 0.31 91 5.0 2001
27 68 89 -22 96 0.94 2000 2.0 80
28 70 86 -1 82 1.04 2003 11.0 2003
29 69 86 8 83 0.54 85 6.0 2003
30 60 90 5 94/2003 1.20 98 0.5 89
31 74 86 8 97 0.62 85 10.0 85

 

... April Normals ...

Avg Max Temperature: 52.6

 Avg Heating Degree Days: 706
Avg Min Temperature: 30.1 Avg Cooling Degree Days: 3
Avg Temperature: 41.3 Avg Precipitation: 2.10
Avg Snowfall: 6.7

... April Records ...
Day Max Yrs Min Yrs Pcp Yrs Snow Yrs
1 69 86 9 96 0.45 86/87 8.0 87
2 68 81 8 92 0.22 90 3.0 90
3 65 91 3 87 1.10 82 6.0 82
4 66 91 4 95 0.93 81 5.0 81
5 78 91 2 96 0.47 89 2.5 2002
6 84 91 -4 2003 0.57 80 2.0 95
7 71 91 0 96 0.64 99 0.5 83
8 69 87 4 97 0.39 80 3.0 97
9 78 87 2 97 0.60 78 4.5 91
10 74 87 9 79 0.45 83 3.0 83
11 66 2003 9 97 1.60 2002 3.0 92
12 78 98 17 97 0.41 82 1.5 80
13 75 98 15 92 1.15 85 5.0 96
14 79 2003 6 96 0.74 83 2.7 83
15 83 2002 21 81/83 0.58 2001 4.0 83
16 89 2002 19 80 0.58 82 9.0 94
17 85 2002 6 83 0.90 82 3.0 82
18 86 87 10 83 0.78 95 3.0 95
19 85 87 18 83 1.50 2004 3.0 82
20 86 87 19 91 0.90 2003 0.0  
21 83 85 19 91 0.58 2003 2.0 86
22 86 80 17 86 0.40 81 0.5 2002
23 85 90 25 83/2002 1.26 2001 1.0 88
24 86 90 25 80/99 0.35 2002 Trace 95/2001
25 89 90 23 97 1.45 96 Trace 92
26 86 90 22 96 1.58 94 3.0 96
27 80 90 20 98 0.56 84 1.0 94
28 79 2004 22 94/98 0.70 93 0.5 2002
29 83 2001 24 2000 0.44 2001 3.0 94
30 83 2001 19 78 1.50 84 9.0 96

... May Normals ...

Avg Max Temperature: 67.0

 Avg Heating Degree Days: 364
Avg Min Temperature: 40.3 Avg Cooling Degree Days: 20
Avg Temperature: 53.7 Avg Precipitation: 3.00
Avg Snowfall: 1.2

... May Records ...
Day Max Yrs Min Yrs Pcp Yrs Snow Yrs
1 80 92 18 78 0.37 86 3.0 84
2 83 92 20 2003 0.90 93 Trace 2002
3 83 2000 21 87 0.35 81 0.0
4 86 80 23 97 0.75 81 Trace 83
5 87 2000 22 92 0.45 81 1.0 79
6 86 2000 24 78/92 1.23 91 2.0 89
7 83 2000 25 94,2004 0.79 84 0.0
8 85 92 21 83 1.38 2002 Trace 80
9 86 93 25 83 0.92 78 0.5 81
10 86 92 20 81 0.83 2001 3.0 90
11 83 91 22 81 2.20 2003 0.0
12 87 2004 25 81 1.59 97 13.0 97
13 83 91 28 81 0.61 2004 0.0
14 87 98 29 84/99 0.69 78 0.0
15 87 91/98 26 83 0.28 94 0.0
16 86 98 22 83 0.83 90 2.0 97
17 84 89 23 88 0.58 2004 0.0
18 88 98 25 81/2002 1.23 99 0.0
19 85 88 23 2000 0.62 96 0.0
20 88 92/94 22 2002 0.69 2003 0.0
21 88 92/94 26 86 0.33 2001 0.0
22 85 91 28 97 0.78 83 0.0
23 87 91 31 2003 0.56 83 0.0
24 82 78/80 28 79/92 1.20 93 0.0
25 78 78 28 79 1.75 81 0.0
26 93 78 25 83/92 2.25 91 0.0
27 89 78 28 94 0.61 88 0.0
28 87 88 28 84 1.30 78 0.0
29 90 88 27 90 0.90 83 0.0
30 92 86 28 90 0.87 83 0.0
31 90 88 34 93 1.11 98 0.0

... June Normals ...

Avg Max Temperature: 74.7

 Avg Heating Degree Days: 145
Avg Min Temperature: 48.9 Avg Cooling Degree Days: 57
Avg Temperature: 61.8 Avg Precipitation: 3.25
Avg Snowfall: 0.0

... June Records ...
Day Max Yrs Min Yrs Pcp Yrs Snow Yrs
1 88 88 34 98/2003 0.27 2001 0.0  
2 85 88/90 28 86 1.17 98 0.0  
3 83 92 28 94 1.35 90 0.0  
4 85 94 30 90 0.21 78 0.0  
5 89 88 29 98 0.56 99 0.0  
6 89 88 34 98 0.87 79 0.0  
7 91 2004 30 83 1.40 79 0.0  
8 88 2004 29 94 1.02 89 0.0  
9 85 99 30 88 0.86 2000 0.0  
10 89 2002 28 80 1.06 79 0.0  
11 89 83 35 80 2.02 86 0.0  
12 92 88 40 86/2000 1.31 98 0.0  
13 93 88 34 78 0.84 90 0.0  
14 94 88 35 97 0.72 80 0.0  
15 88 95 30 89 1.26 81 0.0  
16 89 95 31 80/82 1.15 2000 0.0  
17 90 87/95 34 86 0.72 94 0.0  
18 94 95 34 82 0.66 90 0.0  
19 94 88 37 2004 0.35 88 0.0  
20 89 88 27 92 1.30 93 0.0  
21 87 83/2003 25 92 0.86 96 0.0  
22 90 83/95 31 92 0.49 85 0.0  
23 90 87/97 31 79 1.42 89 0.0  
24 89 80 30 79 1.04 93 0.0  
25 94 2001 39 84 1.04 93 0.0  
26 94 86 34 82 0.65 83 0.0  
27 89 91/96 37 92 1.39 84 0.0  
28 93 96 35 83 0.90 90 0.0  
29 90 96 30 88 1.33 91 0.0  
30 95 2002 33 88 0.83 89 0.0  

 

... July Normals ...

Avg Max Temperature: 78.8

 Avg Heating Degree Days: 56
Avg Min Temperature: 54.5 Avg Cooling Degree Days: 113
Avg Temperature: 66.6 Avg Precipitation: 3.58
Avg Snowfall: 0.0

... July Records ...
Day Max Yrs Min Yrs Pcp Yrs Snow Yrs
1 95 2002 32 88 2.46 91 0.0  
2 92 2002 37 95 2.35 92 0.0  
3 92 90 37 2000 1.08 83 0.0  
4 94 88 39 79 0.70 85 0.0  
5 97 88 35 79 0.78 80 0.0  
6 99 88 41 92 2.12 99 0.0  
7 101 88 39 84 1.57 90 0.0  
8 98 88 46 80 1.08 2002 0.0  
9 91 89 41 97 1.16 82 0.0  
10 89 83/89 40 78 1.35 2003 0.0  
11 90 83 40 85/92 1.72 82 0.0  
12 89 97/98 40 88 1.20 91 0.0  
13 94 98 39 94 1.48 86 0.0  
14 96 83 44 87/90 1.90 80 0.0  
15 94 83 41 89 1.33 2003 0.0  
16 93 83 39 85 0.29 92 0.0  
17 95 86 37 79 0.48 83 0.0  
18 92 86 40 84 2.51 87 0.0  
19 89 78/87 36 2000 1.09 87 0.0  
20 93 98 41 96 0.77 81 0.0  
21 93 99 39 81 0.32 2003 0.0  
22 90 87/99 36 2000 0.48 79 0.0  
23 90 87/2001 40 82 0.19 99 0.0  
24 88 89/99 43 2004 0.71 85 0.0  
25 90 89 43 83 0.90 81 0.0  
26 91 89 38 80 1.12 97 0.0  
27 94 88 40 92 1.63 2002 0.0  
28 101 88 40 84 0.98 91 0.0  
29 96 88 40 92 0.43 91 0.0  
30 99 95 36 78 0.48 88 0.0  
31 95 95 45 90/98 1.17 2003 0.0  

... August Normals ...

Avg Max Temperature: 77.8

 Avg Heating Degree Days: 61
Avg Min Temperature: 53.9 Avg Cooling Degree Days: 94
Avg Temperature: 65.9 Avg Precipitation: 3.11
Avg Snowfall: 0.0

... August Records ...
Day Max Yrs Min Yrs Pcp Yrs Snow Yrs
1 90 88 42 85 1.33 2001 0.0  
2 91 89 49 91/96 0.30 88 0.0  
3 90 89 41 92 0.74 81 0.0  
4 91 89 39 92 1.28 88 0.0  
5 95 2001 39 87 0.87 86 0.0  
6 91 2001 38 90 0.61 2000 0.0  
7 99 83 40 89 0.51 84 0.0  
8 94 83 45 99 0.85 86 0.0  
9 90 92/98 44 83 1.20 85 0.0  
10 91 95 44 82 1.23 83 0.0  
11 93 88 37 79/82 1.20 2004 0.0  
12 87 78/89 36 92 0.41 99 0.0  
13 91 78 33 2004 1.41 99 0.0  
14 93 78 35 92 0.76 88 0.0  
15 93 2003 42 92/2004 1.00 97 0.0  
16 93 88 34 79 0.93 78 0.0  
17 89 95 40 81 2.12 88 0.0  
18 92 2003 37 97 0.57 84 0.0  
19 89 2003 39 91 0.45 80 0.0  
20 88 95 40 88/91 1.23 2003 0.0  
21 85 78/95 37 93 2.95 80 0.0  
22 85 95 45 85/97 1.13 82 0.0  
23 86 92 45 97 3.90 78 0.0  
24 88 2003 38 87 0.73 93 0.0  
25 93 93 41 85 2.12 95 0.0  
26 94 91 40 85 0.27 2000 0.0  
27 95 91 38 96 0.67 84 0.0  
28 94 91 34 82 0.22 83 0.0  
29 95 91 38 82 0.29 85 0.0  
30 91 95 39 99 0.98 97 0.0  
31 88 2000 43 2004 0.83 89 0.0  

 

... September Normals ...

Avg Max Temperature: 68.5

 Avg Heating Degree Days: 244
Avg Min Temperature: 46.7 Avg Cooling Degree Days: 29
Avg Temperature: 57.6 Avg Precipitation: 3.20
Avg Snowfall: 2.3

... September Records ...
Day Max Yrs Min Yrs Pcp Yrs Snow Yrs
1 87 99 37 91 0.46 81 0.0  
2 89 83/99/2004 37 94 1.53 79 0.0  
3 93 99 35 97 1.84 85 0.0  
4 90 99 34 2000 0.34 89 0.0  
5 96 98 35 81 2.31 83 0.0  
6 89 78/2001 32 88 1.33 95 0.0  
7 92 2002 29 86 0.71 81 0.0  
8 91 2002 32 95 0.77 2001 0.0  
9 91 2002 35 95 0.66 99 0.0  <