The following tables present IEM computed monthly data summaries based on
daily data provided by or computed for the IEM. A download interface
exists for the daily summary information. The climatology is provided by the
nearest NCEI climate station (USC00047821) within the current 1991-2020
dataset.
To load shown data into Microsoft Excel,
highlight the table information with your mouse and then copy/paste into Excel.
Precipitation Totals [inch]
Year
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec
1987
M
M
M
M
M
M
M
0.00
0.00
0.00
0.00
0.00
1988
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
1989
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
1990
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
1991
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
1992
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
1993
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
1994
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
1995
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
1996
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
1997
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
1998
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
1999
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
2000
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
2001
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
2002
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
2003
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
2004
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
2005
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
2006
0.00
0.00
0.00
0.00
0.00
30.00
0.00
0.00
0.00
0.00
0.00
0.00
2007
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
2008
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
2009
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
2010
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
2011
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
2012
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
2013
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
M
M
M
2014
M
M
M
M
M
M
M
M
M
M
M
M
2015
M
M
M
M
M
M
M
M
M
M
M
M
2016
M
M
M
M
M
0.00
0.00
M
M
M
M
M
2017
M
M
M
M
M
M
0.00
M
M
M
M
M
2018
M
M
M
M
M
M
M
M
M
M
M
M
2019
M
M
M
M
M
M
M
M
M
M
M
M
2020
M
M
M
M
M
M
M
M
M
M
M
M
2021
M
M
M
M
M
M
M
M
M
M
M
M
2022
M
M
M
M
M
M
M
M
M
M
M
M
2023
M
M
M
M
M
M
M
M
M
M
M
M
2024
M
M
M
M
M
M
M
M
M
M
M
M
2025
M
M
M
M
M
M
M
M
M
M
M
M
NCEI Climatology
2.97
3.35
2.64
1.24
0.54
0.17
0.01
0.03
0.07
0.80
1.36
3.07
Average Wind Speed [MPH]
Year
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec
1987
M
M
M
M
M
M
M
M
6.3
4.7
5.3
8.9
1988
4.9
4.8
6.9
6.0
6.8
6.3
5.8
6.0
5.0
4.3
5.0
4.6
1989
3.5
4.2
6.2
5.6
7.1
7.4
6.2
6.2
4.8
4.4
2.2
1.7
1990
4.3
4.5
5.0
6.0
7.0
7.3
6.4
5.9
5.3
3.7
3.3
2.3
1991
2.9
5.0
8.2
7.7
7.9
6.1
5.7
6.8
4.9
4.7
4.7
3.6
1992
2.9
5.4
5.2
5.7
6.3
7.2
6.3
5.3
5.1
4.3
3.3
5.5
1993
4.0
5.7
4.7
6.3
6.9
6.5
5.9
5.8
4.4
3.7
3.5
3.2
1994
2.8
4.4
5.0
5.9
6.3
6.0
6.3
5.6
5.1
4.2
4.8
3.5
1995
8.2
2.6
6.9
7.3
7.0
8.0
7.2
6.4
6.3
4.3
3.0
4.3
1996
4.5
5.8
5.2
7.2
7.7
6.7
6.3
5.8
6.0
5.5
4.7
6.4
1997
4.8
6.1
5.3
8.0
7.1
8.4
6.7
6.3
5.2
4.5
4.2
5.2
1998
5.5
8.2
5.6
6.2
7.2
6.8
7.3
5.8
6.1
5.3
5.5
4.0
1999
4.1
5.7
7.2
7.4
7.9
7.5
7.5
7.2
5.7
3.7
4.7
2.9
2000
3.3
6.9
7.0
7.5
8.0
7.3
7.3
6.7
5.9
6.0
3.7
3.5
2001
6.1
7.9
6.0
7.1
6.5
7.2
7.6
7.6
5.9
5.3
5.1
6.0
2002
4.6
4.5
6.7
7.1
7.4
8.4
7.4
7.1
6.4
5.5
4.1
7.5
2003
3.9
5.4
7.2
8.1
7.8
8.1
6.8
7.6
6.4
5.5
4.6
6.3
2004
5.0
7.6
6.3
8.2
8.6
9.0
8.7
7.3
6.6
5.8
5.7
5.5
2005
4.7
5.2
6.9
7.7
8.0
8.7
6.4
6.1
5.9
5.5
4.6
6.0
2006
4.7
4.8
9.0
8.3
8.0
8.0
6.5
6.7
5.6
4.8
5.5
5.3
2007
4.9
7.1
6.0
8.3
9.3
9.1
8.9
7.9
6.7
5.4
3.5
6.4
2008
6.9
6.2
6.7
8.0
8.2
7.8
6.6
6.4
5.2
4.7
3.1
4.3
2009
3.2
7.0
7.8
8.0
8.2
8.3
6.9
6.9
5.4
6.3
3.9
4.3
2010
5.5
6.1
6.0
7.6
8.0
8.0
7.9
7.7
5.6
5.4
8.8
8.5
2011
3.9
6.5
8.2
8.0
8.3
7.6
7.7
6.8
5.9
4.0
4.5
3.7
2012
4.6
6.1
8.4
8.1
8.8
8.6
8.3
6.3
5.3
5.0
4.8
6.5
2013
3.3
5.3
5.6
8.4
9.0
8.0
6.8
7.2
7.2
4.7
4.5
3.0
2014
2.5
6.4
6.6
7.7
8.8
8.1
7.2
6.9
6.3
4.7
3.8
6.8
2015
2.0
6.0
4.9
7.6
8.1
7.0
8.6
7.9
5.5
4.9
4.2
5.4
2016
7.3
4.3
7.2
6.8
7.6
8.5
8.0
7.2
6.3
6.8
4.5
4.5
2017
6.3
7.2
5.3
7.5
7.1
8.0
6.3
5.3
5.5
4.8
4.1
3.2
2018
2.8
5.6
6.7
7.7
8.6
8.8
7.3
6.8
5.8
4.9
3.8
4.7
2019
6.1
8.8
5.8
5.5
5.9
5.8
5.7
5.4
5.1
3.9
3.3
5.2
2020
3.4
3.7
4.5
5.5
6.2
6.6
6.1
5.0
4.1
2.7
2.9
2.3
2021
4.1
4.1
5.2
5.4
6.3
7.1
5.9
4.9
4.5
5.4
2.5
4.3
2022
2.0
3.6
4.8
6.7
6.8
7.5
5.8
5.6
4.7
3.6
2.8
3.2
2023
7.0
5.1
7.1
6.0
6.3
6.6
4.9
5.2
5.7
3.7
3.5
3.4
2024
4.2
5.5
6.3
6.8
5.7
5.9
5.0
5.4
4.1
3.4
4.7
3.7
2025
2.7
4.9
5.0
M
M
M
M
M
M
M
M
M
NCEI Climatology
M
M
M
M
M
M
M
M
M
M
M
M
Average Daily High Temperature [F]
Year
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec
1987
M
M
M
M
M
M
M
78.00
80.27
76.48
63.27
55.43
1988
58.48
64.86
68.65
69.67
71.68
78.47
85.94
82.32
81.47
75.29
65.20
59.23
1989
57.32
57.43
64.19
73.30
73.42
78.07
82.55
81.97
77.60
74.65
68.40
62.48
1990
61.58
60.21
67.77
76.43
77.23
82.80
87.71
88.65
88.07
84.74
73.27
59.04
1991
59.90
66.96
58.68
66.30
70.29
76.17
83.55
79.10
82.93
78.81
67.03
59.97
1992
57.71
64.76
65.03
73.07
79.58
78.57
82.87
84.68
81.93
78.35
67.10
56.97
1993
56.81
59.46
67.26
67.73
74.48
81.87
83.84
84.16
80.73
75.77
66.63
57.87
1994
60.45
58.93
67.65
68.20
71.13
79.80
81.87
84.39
80.43
73.68
58.83
55.26
1995
59.74
63.18
62.48
66.57
70.45
76.50
83.26
83.27
80.37
77.87
70.10
60.97
1996
59.65
63.03
67.48
72.50
75.94
81.53
86.88
85.10
80.10
73.45
64.64
60.90
1997
57.71
63.00
69.48
71.37
80.74
79.62
84.37
82.65
83.84
74.09
66.80
59.90
1998
60.65
58.00
64.13
67.81
66.61
75.60
82.84
87.81
81.08
72.90
62.97
56.92
1999
58.61
60.19
60.87
66.97
70.13
78.71
81.32
80.45
82.79
80.05
67.10
62.42
2000
60.59
61.64
65.13
71.53
75.55
82.67
79.00
83.37
82.23
71.45
61.80
61.14
2001
58.46
59.16
67.74
65.89
83.48
83.61
82.13
82.08
81.02
77.48
67.03
58.27
2002
60.19
64.61
65.04
67.95
73.57
76.07
82.77
84.56
84.36
75.39
69.91
62.30
2003
64.79
62.61
67.99
64.47
75.75
82.21
87.77
84.08
84.38
79.63
63.61
60.03
2004
57.81
60.07
72.84
73.47
75.10
78.48
83.08
83.19
83.86
71.44
63.10
60.19
2005
58.33
62.71
67.08
67.20
73.19
76.71
86.63
84.48
78.33
74.48
67.98
61.66
2006
60.10
63.21
60.41
65.54
76.43
81.59
88.85
82.85
79.92
73.69
65.12
60.28
2007
58.65
61.18
70.55
70.16
75.37
80.90
83.10
83.45
79.23
72.12
67.40
56.93
2008
55.58
61.17
65.79
69.68
75.43
81.86
83.68
85.48
84.44
78.63
68.48
58.07
2009
64.52
62.47
64.88
70.52
78.68
80.18
83.33
84.95
85.10
73.63
67.34
57.55
2010
58.71
62.09
65.79
64.94
70.26
80.06
81.88
80.83
83.06
74.62
65.30
60.16
2011
60.22
60.29
62.83
66.68
69.86
77.90
83.86
81.37
85.58
76.77
64.10
61.44
2012
62.54
64.46
64.28
70.04
76.77
80.78
83.74
83.15
81.80
75.95
67.94
59.12
2013
58.94
62.02
69.28
75.68
77.17
82.88
86.00
82.86
81.14
75.90
69.26
61.55
2014
68.81
64.27
71.02
74.06
80.14
83.78
88.21
85.36
87.02
84.78
71.60
63.30
2015
65.04
69.74
76.28
72.56
70.67
84.20
84.20
85.25
85.34
81.41
63.56
58.30
2016
60.80
70.11
66.95
72.50
76.30
84.80
85.42
83.15
83.36
74.15
67.76
59.00
2017
57.32
61.06
68.35
69.80
76.25
81.86
87.63
85.13
85.63
79.44
68.48
63.47
2018
62.66
64.98
65.33
70.67
73.64
82.04
85.48
83.62
81.68
77.52
69.44
60.34
2019
62.96
57.33
65.15
75.46
70.90
84.02
84.08
85.77
81.74
76.76
67.04
61.03
2020
58.94
65.13
62.25
69.38
78.39
83.06
83.91
87.86
83.60
81.94
65.66
61.38
2021
61.50
63.37
63.94
71.00
76.71
81.02
84.26
85.30
83.72
73.81
67.88
56.85
2022
61.82
66.33
67.94
70.10
75.55
83.48
81.88
85.71
85.34
75.08
62.96
56.91
2023
58.59
57.97
58.54
69.26
71.72
76.16
85.64
86.90
78.08
77.29
69.80
62.17
2024
59.58
61.17
63.88
69.44
76.59
83.36
88.85
83.68
82.77
80.72
63.89
62.37
2025
61.26
62.60
60.80
M
M
M
M
M
M
M
M
M
NCEI Climatology
58.99
62.88
66.39
70.00
74.91
80.10
82.20
82.70
81.41
74.59
65.00
58.80
Average Daily Low Temperature [F]
Year
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec
1987
M
M
M
M
M
M
M
66.00
56.73
56.48
47.50
43.27
1988
41.68
42.31
46.03
49.30
51.45
56.27
60.29
58.77
54.73
54.10
47.93
40.77
1989
37.90
40.75
49.03
51.00
51.97
57.27
56.42
56.19
55.43
50.94
44.27
39.00
1990
42.52
41.82
49.06
53.60
56.58
60.90
64.84
66.16
61.63
57.45
49.53
39.72
1991
39.90
46.21
44.68
46.30
50.32
54.10
58.65
59.43
57.87
54.45
46.90
39.48
1992
39.65
48.00
50.23
51.77
56.10
57.70
60.84
59.10
57.27
55.29
46.07
40.90
1993
40.71
43.79
50.48
49.47
54.52
59.10
57.61
59.26
56.23
54.87
43.27
40.19
1994
40.52
42.68
47.32
48.67
52.87
56.00
56.74
56.71
57.87
50.35
41.53
40.58
1995
49.35
48.04
47.48
48.60
52.77
56.73
61.71
60.17
57.90
53.29
49.69
48.13
1996
45.10
48.45
47.97
51.20
54.48
56.77
60.55
58.06
54.69
50.95
47.23
46.73
1997
45.04
43.89
46.61
50.31
57.03
58.69
60.00
61.54
59.31
52.63
50.24
41.58
1998
47.29
47.18
48.06
48.17
52.71
57.60
60.03
59.68
59.63
50.07
47.40
37.07
1999
41.35
43.84
44.87
47.07
50.61
55.63
58.77
59.68
57.07
53.63
49.25
39.10
2000
47.34
48.72
47.68
51.40
55.51
59.67
58.26
59.35
58.37
53.03
43.47
42.45
2001
39.88
44.09
48.55
45.23
56.63
59.29
59.34
58.83
56.77
54.36
48.46
45.10
2002
39.99
43.71
45.12
49.64
51.74
54.46
57.26
59.01
57.99
53.43
48.57
46.88
2003
48.34
43.96
48.83
48.56
54.54
59.49
61.95
60.84
59.92
54.93
46.18
46.90
2004
44.45
44.83
49.61
50.93
53.81
57.53
59.91
60.77
57.27
52.39
46.26
42.84
2005
42.43
47.95
49.17
47.20
54.46
56.84
61.11
58.71
55.27
52.95
46.93
46.22
2006
43.90
44.74
45.55
50.23
54.51
59.36
62.77
58.36
55.68
51.57
48.56
41.99
2007
37.28
46.08
47.27
48.74
54.01
57.44
60.34
59.99
58.82
52.19
46.51
41.74
2008
42.28
44.35
43.67
47.60
53.19
56.90
61.32
61.15
59.30
54.01
52.58
42.39
2009
43.90
46.79
47.45
50.06
57.72
60.68
60.63
61.50
60.80
54.41
46.52
42.68
2010
45.35
48.46
45.82
47.42
51.16
58.94
58.94
57.55
58.34
54.94
46.40
47.15
2011
42.68
41.39
47.79
48.62
51.16
56.72
60.46
59.51
61.22
55.69
47.00
39.84
2012
41.87
45.84
46.86
51.20
54.82
58.10
59.58
59.30
55.25
55.81
49.94
44.77
2013
37.86
41.13
48.26
52.28
56.10
61.34
60.92
61.73
58.70
50.64
46.70
36.35
2014
42.39
48.39
50.23
51.62
56.91
59.48
64.23
62.14
64.28
59.23
52.04
50.41
2015
43.26
49.61
50.36
50.00
54.59
60.68
63.35
63.53
60.56
57.84
43.10
41.58
2016
47.68
46.34
49.54
51.86
55.63
59.78
59.41
58.77
56.30
54.82
50.42
42.34
2017
42.86
48.46
48.90
51.32
55.63
60.62
60.51
62.25
62.60
51.92
49.70
39.32
2018
45.99
41.77
47.04
50.62
54.68
59.06
62.08
59.81
55.58
53.77
47.18
43.96
2019
46.16
43.73
47.39
53.99
53.54
60.14
59.29
62.72
59.54
51.44
46.94
47.85
2020
43.96
44.73
47.62
50.72
55.75
58.94
58.71
62.66
60.98
55.98
43.52
41.41
2021
43.38
44.54
43.90
48.62
52.44
58.76
59.12
59.17
58.40
53.54
48.56
43.96
2022
41.84
41.06
46.28
49.22
52.85
59.84
60.80
61.09
61.52
53.60
41.78
41.58
2023
43.85
38.94
43.73
47.78
53.66
56.36
59.72
62.78
58.64
55.05
47.11
46.21
2024
46.40
46.03
48.43
48.86
52.90
59.18
63.41
60.28
59.06
56.04
46.91
46.05
2025
40.30
45.31
46.04
M
M
M
M
M
M
M
M
M
NCEI Climatology
43.30
45.43
47.60
49.81
53.30
57.00
59.10
59.80
58.21
53.80
47.21
42.80
Average Daily Temperature (high+low)/2 [F]
Year
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec
1987
M
M
M
M
M
M
M
72.00
68.50
66.48
55.38
49.35
1988
50.08
53.59
57.34
59.48
61.56
67.37
73.11
70.55
68.10
64.69
56.57
50.00
1989
47.61
49.09
56.61
62.15
62.69
67.67
69.48
69.08
66.52
62.79
56.33
50.74
1990
52.05
51.02
58.42
65.02
66.90
71.85
76.27
77.40
74.85
71.10
61.40
49.38
1991
49.90
56.59
51.68
56.30
60.31
65.13
71.10
69.27
70.40
66.63
56.97
49.73
1992
48.68
56.38
57.63
62.42
67.84
68.13
71.85
71.89
69.60
66.82
56.58
48.94
1993
48.76
51.62
58.87
58.60
64.50
70.48
70.73
71.71
68.48
65.32
54.95
49.03
1994
50.48
50.80
57.48
58.43
62.00
67.90
69.31
70.55
69.15
62.02
50.18
47.92
1995
54.55
55.61
54.98
57.58
61.61
66.62
72.48
71.72
69.13
65.58
59.90
54.55
1996
52.37
55.74
57.73
61.85
65.21
69.15
73.72
71.58
67.39
62.20
55.94
53.81
1997
51.37
53.45
58.05
60.84
68.89
69.16
72.19
72.09
71.57
63.36
58.52
50.74
1998
53.97
52.59
56.10
57.99
59.66
66.60
71.44
73.75
70.36
61.49
55.18
46.99
1999
49.98
52.01
52.87
57.02
60.37
67.17
70.05
70.06
69.93
66.84
58.18
50.76
2000
53.97
55.18
56.40
61.46
65.53
71.17
68.63
71.36
70.30
62.24
52.63
51.79
2001
49.17
51.62
58.15
55.56
70.05
71.45
70.73
70.45
68.89
65.92
57.75
51.68
2002
50.09
54.16
55.08
58.80
62.65
65.27
70.01
71.78
71.18
64.41
59.24
54.59
2003
56.56
53.28
58.41
56.51
65.14
70.85
74.86
72.46
72.15
67.28
54.89
53.46
2004
51.13
52.45
61.23
62.20
64.45
68.01
71.49
71.98
70.56
61.92
54.68
51.51
2005
50.38
55.33
58.13
57.20
63.83
66.78
73.87
71.60
66.80
63.71
57.45
53.94
2006
52.00
53.98
53.00
57.89
65.47
70.42
75.81
70.57
67.80
62.63
56.84
51.13
2007
47.97
53.63
58.91
59.45
64.69
69.17
71.72
71.72
69.03
62.16
56.96
49.33
2008
48.89
52.76
54.73
58.64
64.31
69.38
72.50
73.31
71.87
66.32
60.53
50.23
2009
54.21
54.63
56.12
60.29
68.20
70.43
71.98
73.23
72.95
64.02
56.93
50.12
2010
52.03
55.27
55.81
56.18
60.71
69.50
70.41
69.19
70.70
64.78
55.85
53.66
2011
51.45
50.84
55.31
57.65
60.51
67.31
72.16
70.44
73.40
66.23
55.55
50.64
2012
52.25
55.15
55.57
60.62
65.79
69.44
71.66
71.22
68.53
65.88
58.94
51.95
2013
48.40
51.58
58.77
63.98
66.64
72.11
73.46
72.30
69.92
63.27
57.98
48.95
2014
55.60
56.33
60.63
62.84
68.52
71.63
76.22
73.75
75.65
72.01
61.82
56.85
2015
54.15
59.67
63.32
61.28
62.63
72.44
73.78
74.39
72.95
69.63
53.33
49.94
2016
54.24
58.22
58.25
62.18
65.97
72.29
72.41
70.96
69.83
64.49
59.09
50.67
2017
50.09
54.76
58.62
60.56
65.94
71.24
74.07
73.69
74.11
65.68
59.09
51.39
2018
54.33
53.37
56.18
60.64
64.16
70.55
73.78
71.72
68.63
65.65
58.31
52.15
2019
54.56
50.53
56.27
64.72
62.22
72.08
71.69
74.24
70.64
64.10
56.99
54.44
2020
51.45
54.93
54.94
60.05
67.07
71.00
71.31
75.26
72.29
68.96
54.59
51.39
2021
52.44
53.95
53.92
59.81
64.57
69.89
71.69
72.24
71.06
63.67
58.22
50.41
2022
51.83
53.70
57.11
59.66
64.20
71.66
71.34
73.40
73.43
64.34
52.37
49.25
2023
51.22
48.46
51.13
58.52
62.69
66.26
72.68
74.84
68.36
66.17
58.45
54.19
2024
52.99
53.60
56.15
59.15
64.75
71.27
76.13
71.98
70.92
68.38
55.40
54.21
2025
50.78
53.95
53.42
M
M
M
M
M
M
M
M
M
NCEI Climatology
51.15
54.16
57.00
59.90
64.10
68.55
70.65
71.25
69.81
64.20
56.10
50.80
Average Relative Humidity [%]
This value is computed via a simple average of available observations weighted
by the duration between observations.
