Record envelope, standing records and threshold days for Ontonagon 6 SE (USC00206220), Michigan, United States, with 38 years of record.
Key Facts for Ontonagon 6 SE
Ontonagon 6 SE (USC00206220) is a weather station in Michigan, United States at 46.83 latitude and -89.21 longitude, 241 m (790 ft) above sea level.
The station reports from 1977 to 2014, 38 years of record.
1,464 records set at Ontonagon 6 SE still stand.
Records are tracked for tmax, tmin, prcp, snow, snwd: an element needs 30 years of data to be eligible.
Ontonagon 6 SE set a daily record snow depth of 45.7 cm (18.0 in) on 16 November 2014.
About the Station
Location: Michigan, United States, 46.83 latitude, -89.21 longitude.
Elevation: 241 m (790 ft).
Period of record: 1977 to 2014, 38 years.
Eligible elements: tmax, tmin, prcp, snow, snwd.
Daily Record Envelope and 2026
0 days at or beyond a record
Record highRecord low2026 daily maximum2026 daily minimum
The band shows the record high and record low for each calendar day at Ontonagon 6 SE. The lines show the 2026 daily maximum and minimum. 0 days in 2026 matched or passed a record. Temperatures are in degrees Celsius.
Daily record high and record low at Ontonagon 6 SE, with 2026 drawn through them
Month
Highest record high
Lowest record low
2026 highest maximum
2026 lowest minimum
Jan
13.3 C (55.9 F)
-40.6 C (-41.1 F)
n/a
n/a
Feb
18.9 C (66.0 F)
-41.1 C (-42.0 F)
n/a
n/a
Mar
28.3 C (82.9 F)
-36.1 C (-33.0 F)
n/a
n/a
Apr
31.7 C (89.1 F)
-21.1 C (-6.0 F)
n/a
n/a
May
35.0 C (95.0 F)
-7.8 C (18.0 F)
n/a
n/a
Jun
35.6 C (96.1 F)
-3.9 C (25.0 F)
n/a
n/a
Jul
38.3 C (100.9 F)
0.0 C (32.0 F)
n/a
n/a
Aug
37.2 C (99.0 F)
1.1 C (34.0 F)
n/a
n/a
Sep
36.1 C (97.0 F)
-3.9 C (25.0 F)
n/a
n/a
Oct
31.1 C (88.0 F)
-9.4 C (15.1 F)
n/a
n/a
Nov
25.0 C (77.0 F)
-20.6 C (-5.1 F)
n/a
n/a
Dec
16.7 C (62.1 F)
-30.6 C (-23.1 F)
n/a
n/a
Which Years Hold Standing Records
1,464 standing records
Year with most
1,464 records at Ontonagon 6 SE still stand. 1989 holds the most, with 64.
Standing records at Ontonagon 6 SE by the year they were set
Year set
Standing records
1977
11
1978
36
1979
48
1980
31
1981
39
1982
40
1983
56
1984
39
1985
40
1986
36
1987
36
1988
49
1989
64
1990
40
1991
59
1992
47
1993
37
1994
43
1995
34
1996
41
1997
28
1998
38
1999
23
2000
43
2001
39
2002
25
2003
38
2004
28
2005
49
2006
31
2007
41
2008
33
2009
42
2010
39
2011
30
2012
37
2013
39
2014
35
Wettest Day of Each Month
Aug: 99.1 mm (3.9 in)
The wettest day on record for each calendar month at Ontonagon 6 SE. The most was 99.1 mm (3.9 in) on 23 August 1978.
Record daily precipitation for each month at Ontonagon 6 SE
Month
Record daily precipitation (mm)
Date
Jan
36.8 mm (1.4 in)
18 January 1996
Feb
35.6 mm (1.4 in)
8 February 2011
Mar
63.5 mm (2.5 in)
25 March 1996
Apr
40.6 mm (1.6 in)
11 April 2002
May
57.2 mm (2.3 in)
26 May 1991
Jun
51.3 mm (2.0 in)
11 June 1986
Jul
63.8 mm (2.5 in)
18 July 1987
Aug
99.1 mm (3.9 in)
23 August 1978
Sep
58.7 mm (2.3 in)
5 September 1983
Oct
47.0 mm (1.9 in)
25 October 2012
Nov
48.3 mm (1.9 in)
1 November 1991
Dec
24.6 mm (1.0 in)
5 December 1998
Period of Record Coverage
1977 to 2014
Complete yearUnder 90 percent of days
38 years of record at Ontonagon 6 SE, 1977 to 2014. 3 years have data for under 90 percent of days and are left out of rankings: 1977, 1994, 2014.
Cooler than the station meanWarmer than the station mean
One stripe for each of 31 complete years at Ontonagon 6 SE, 1978 to 2013. Blue stripes are years cooler than the station's own mean of 6.1 C (42.9 F); red stripes are warmer. The coolest year was 1996, at 4.1 C (39.5 F), and the warmest was 2012, at 8.1 C (46.6 F). The strongest colour marks a difference of 2.1 C (3.8 F).
Annual mean temperature at Ontonagon 6 SE as warming stripes, 1978 to 2013
Year
Annual mean temperature
Difference from the station mean
1978
5.1 C
-1.02 C
1979
4.2 C
-1.86 C
1980
5.1 C
-0.93 C
1981
6.3 C
+0.26 C
1982
5.0 C
-1.12 C
1983
6.2 C
+0.16 C
1984
6.1 C
+0.01 C
1985
5.0 C
-1.07 C
1986
6.1 C
-0.01 C
1987
7.9 C
+1.85 C
1988
6.0 C
-0.04 C
1989
4.9 C
-1.13 C
1990
6.3 C
+0.25 C
1991
6.3 C
+0.20 C
1992
5.5 C
-0.57 C
1993
5.1 C
-0.96 C
1995
5.9 C
-0.15 C
1996
4.1 C
-1.93 C
1997
5.3 C
-0.75 C
1998
8.0 C
+1.93 C
2000
6.4 C
+0.33 C
2001
7.3 C
+1.24 C
2005
7.2 C
+1.10 C
2006
7.4 C
+1.36 C
2007
7.0 C
+0.88 C
2008
5.3 C
-0.74 C
2009
5.4 C
-0.69 C
2010
7.5 C
+1.44 C
2011
6.9 C
+0.78 C
2012
8.1 C
+2.04 C
2013
5.3 C
-0.79 C
The annual mean temperature here has risen by 0.4 C (0.1 to 0.8) per decade over 1978 to 2013. In Fahrenheit: 0.8 F (0.2 to 1.4) per decade. The slope is a straight line fitted to 31 complete years; the brackets give its 95 percent interval.
Fitted temperature trends per decade at Ontonagon 6 SE
Measure
Per decade (C)
Per decade (F)
Period
Complete years
Reading
Annual mean temperature
0.4 C (0.1 to 0.8) per decade
0.8 F (0.2 to 1.4) per decade
1978 to 2013
31
Rise
Mean daily maximum
0.39 C (0.03 to 0.74) per decade
0.7 F (0.1 to 1.3) per decade
1978 to 2013
31
Rise
Mean daily minimum
0.5 C (0.1 to 0.8) per decade
0.8 F (0.2 to 1.5) per decade
1978 to 2013
31
Rise
A year is complete when all 12 months have at least 20 days of both daily maximum and daily minimum readings. The annual mean is the mean of the monthly means. The trend describes this one station over this period; it does not say what caused the change.
Extremes by Year
1977 to 2014
Yearly extremes at Ontonagon 6 SE: the record and the median year
Measure
Record
Year of the record
Median year
Years with a value
Hottest day (TXx)
38.3 C (100.9 F)
1988
33.9 C (93.0 F)
38
Coldest night (TNn)
-41.1 C (-42.0 F)
1979
-29.7 C (-21.5 F)
38
Wettest day (Rx1day)
99.1 mm (3.9 in)
1978
44.8 mm (1.8 in)
38
Wettest five days (Rx5day)
130.1 mm (5.1 in)
1991
67.8 mm (2.7 in)
38
Longest dry spell (CDD)
35 days
1984
17 days
38
Hottest day (TXx)
The hottest day of the year at Ontonagon 6 SE, 1977 to 2014. The record is 38.3 C (100.9 F) in 1988, marked on the chart; the median year is 33.9 C (93.0 F).
Hottest day (TXx) at Ontonagon 6 SE by year
Year
Hottest day (TXx)
1977
23.9 C (75.0 F)
1978
33.9 C (93.0 F)
1979
31.7 C (89.1 F)
1980
32.8 C (91.0 F)
1981
33.3 C (91.9 F)
1982
33.9 C (93.0 F)
1983
37.2 C (99.0 F)
1984
31.7 C (89.1 F)
1985
32.2 C (90.0 F)
1986
35.0 C (95.0 F)
1987
33.3 C (91.9 F)
1988
38.3 C (100.9 F)
1989
33.9 C (93.0 F)
1990
33.3 C (91.9 F)
1991
35.0 C (95.0 F)
1992
32.2 C (90.0 F)
1993
33.9 C (93.0 F)
1994
31.1 C (88.0 F)
1995
37.2 C (99.0 F)
1996
33.9 C (93.0 F)
1997
32.2 C (90.0 F)
1998
35.6 C (96.1 F)
1999
35.6 C (96.1 F)
2000
31.7 C (89.1 F)
2001
35.0 C (95.0 F)
2002
35.0 C (95.0 F)
2003
33.9 C (93.0 F)
2004
32.8 C (91.0 F)
2005
36.7 C (98.1 F)
2006
37.8 C (100.0 F)
2007
34.4 C (93.9 F)
2008
33.3 C (91.9 F)
2009
33.3 C (91.9 F)
2010
34.4 C (93.9 F)
2011
36.1 C (97.0 F)
2012
33.3 C (91.9 F)
2013
35.0 C (95.0 F)
2014
33.9 C (93.0 F)
Coldest night (TNn)
The coldest night of the year at Ontonagon 6 SE, 1977 to 2014. The record is -41.1 C (-42.0 F) in 1979, marked on the chart; the median year is -29.7 C (-21.5 F).
Coldest night (TNn) at Ontonagon 6 SE by year
Year
Coldest night (TNn)
1977
-22.8 C (-9.0 F)
1978
-30.6 C (-23.1 F)
1979
-41.1 C (-42.0 F)
1980
-31.1 C (-24.0 F)
1981
-30.6 C (-23.1 F)
1982
-32.8 C (-27.0 F)
1983
-25.6 C (-14.1 F)
1984
-35.0 C (-31.0 F)
1985
-35.0 C (-31.0 F)
1986
-30.6 C (-23.1 F)
1987
-23.3 C (-9.9 F)
1988
-32.8 C (-27.0 F)
1989
-31.7 C (-25.1 F)
1990
-30.6 C (-23.1 F)
1991
-30.0 C (-22.0 F)
1992
-27.2 C (-17.0 F)
1993
-29.4 C (-20.9 F)
1994
-40.6 C (-41.1 F)
1995
-23.3 C (-9.9 F)
1996
-37.8 C (-36.0 F)
1997
-28.9 C (-20.0 F)
1998
-23.9 C (-11.0 F)
1999
-25.0 C (-13.0 F)
2000
-26.1 C (-15.0 F)
2001
-27.8 C (-18.0 F)
2002
-23.3 C (-9.9 F)
2003
-31.7 C (-25.1 F)
2004
-30.0 C (-22.0 F)
2005
-26.1 C (-15.0 F)
2006
-24.4 C (-11.9 F)
2007
-26.7 C (-16.1 F)
2008
-30.0 C (-22.0 F)
2009
-32.8 C (-27.0 F)
2010
-25.6 C (-14.1 F)
2011
-26.7 C (-16.1 F)
2012
-22.2 C (-8.0 F)
2013
-27.8 C (-18.0 F)
2014
-34.4 C (-29.9 F)
Wettest day (Rx1day)
The wettest day of the year at Ontonagon 6 SE, 1977 to 2014. The record is 99.1 mm (3.9 in) in 1978, marked on the chart; the median year is 44.8 mm (1.8 in).
Wettest day (Rx1day) at Ontonagon 6 SE by year
Year
Wettest day (Rx1day)
1977
16.0 mm (0.6 in)
1978
99.1 mm (3.9 in)
1979
38.9 mm (1.5 in)
1980
74.9 mm (2.9 in)
1981
44.5 mm (1.8 in)
1982
43.7 mm (1.7 in)
1983
58.7 mm (2.3 in)
1984
47.0 mm (1.9 in)
1985
46.7 mm (1.8 in)
1986
51.3 mm (2.0 in)
1987
63.8 mm (2.5 in)
1988
53.8 mm (2.1 in)
1989
36.1 mm (1.4 in)
1990
39.9 mm (1.6 in)
1991
62.5 mm (2.5 in)
1992
59.7 mm (2.4 in)
1993
33.0 mm (1.3 in)
1994
40.1 mm (1.6 in)
1995
53.8 mm (2.1 in)
1996
63.5 mm (2.5 in)
1997
40.4 mm (1.6 in)
1998
33.3 mm (1.3 in)
1999
53.8 mm (2.1 in)
2000
29.2 mm (1.1 in)
2001
33.8 mm (1.3 in)
2002
43.2 mm (1.7 in)
2003
55.9 mm (2.2 in)
2004
38.1 mm (1.5 in)
2005
44.5 mm (1.8 in)
2006
43.7 mm (1.7 in)
2007
45.5 mm (1.8 in)
2008
38.6 mm (1.5 in)
2009
49.5 mm (1.9 in)
2010
45.0 mm (1.8 in)
2011
37.3 mm (1.5 in)
2012
47.0 mm (1.9 in)
2013
38.1 mm (1.5 in)
2014
47.0 mm (1.9 in)
Wettest five days (Rx5day)
The wettest five days of the year at Ontonagon 6 SE, 1977 to 2014. The record is 130.1 mm (5.1 in) in 1991, marked on the chart; the median year is 67.8 mm (2.7 in).
Wettest five days (Rx5day) at Ontonagon 6 SE by year
Year
Wettest five days (Rx5day)
1977
40.7 mm (1.6 in)
1978
107.2 mm (4.2 in)
1979
88.7 mm (3.5 in)
1980
99.0 mm (3.9 in)
1981
62.8 mm (2.5 in)
1982
108.3 mm (4.3 in)
1983
83.0 mm (3.3 in)
1984
66.8 mm (2.6 in)
1985
69.8 mm (2.7 in)
1986
67.6 mm (2.7 in)
1987
94.3 mm (3.7 in)
1988
100.3 mm (3.9 in)
1989
67.6 mm (2.7 in)
1990
76.7 mm (3.0 in)
1991
130.1 mm (5.1 in)
1992
105.7 mm (4.2 in)
1993
59.4 mm (2.3 in)
1994
54.1 mm (2.1 in)
1995
74.4 mm (2.9 in)
1996
65.3 mm (2.6 in)
1997
61.8 mm (2.4 in)
1998
71.9 mm (2.8 in)
1999
79.7 mm (3.1 in)
2000
44.2 mm (1.7 in)
2001
58.4 mm (2.3 in)
2002
76.2 mm (3.0 in)
2003
87.2 mm (3.4 in)
2004
54.1 mm (2.1 in)
2005
97.8 mm (3.9 in)
2006
65.0 mm (2.6 in)
2007
82.3 mm (3.2 in)
2008
67.6 mm (2.7 in)
2009
58.1 mm (2.3 in)
2010
58.0 mm (2.3 in)
2011
50.6 mm (2.0 in)
2012
67.9 mm (2.7 in)
2013
67.6 mm (2.7 in)
2014
50.1 mm (2.0 in)
Longest dry spell (CDD)
The longest dry spell of the year at Ontonagon 6 SE, 1977 to 2014. The record is 35 days in 1984, marked on the chart; the median year is 17 days.
Longest dry spell (CDD) at Ontonagon 6 SE by year
Year
Longest dry spell (CDD)
1977
8 days
1978
18 days
1979
16 days
1980
17 days
1981
24 days
1982
14 days
1983
17 days
1984
35 days
1985
18 days
1986
29 days
1987
29 days
1988
13 days
1989
17 days
1990
17 days
1991
15 days
1992
16 days
1993
13 days
1994
20 days
1995
22 days
1996
12 days
1997
26 days
1998
27 days
1999
19 days
2000
20 days
2001
14 days
2002
13 days
2003
18 days
2004
15 days
2005
19 days
2006
13 days
2007
16 days
2008
13 days
2009
29 days
2010
23 days
2011
12 days
2012
17 days
2013
21 days
2014
14 days
Each chart shows one value per year; the dot marks the record year. TXx is the hottest daily maximum, TNn the coldest daily minimum, Rx1day and Rx5day the largest one-day and five-day rain totals, and CDD the longest run of days with less than 1 mm of rain. A year with missing days can understate an extreme.
Frost Dates and Growing Season
31 years with a frost
Across 31 years with a frost, the median last spring frost at Ontonagon 6 SE falls on 1 June and the median first autumn frost on 25 September, which leaves a median of 119 days between them.
Fitted over all years, the growing season changes by +7.2 days per decade at this station.
Frost dates and growing season at Ontonagon 6 SE
Measure
Median, all years
Earliest period
Recent period (1979 to 2013)
Recent against earliest
Fitted trend
Last spring frost
1 June
n/a
31 May
n/a
-4.4 days per decade
First autumn frost
25 September
n/a
25 September
n/a
+2.8 days per decade
Growing days
119 days
n/a
120 days
n/a
+7.2 days per decade
A frost day is a day with a daily minimum at or below 0 C (32 F). The last spring frost and the first autumn frost are the last and first such days of the cold season, and growing days are the days between them. A negative trend for the last spring frost means it comes earlier.
Rainfall Return Levels
36 years, 1978 to 2013
A day with at least 44.9 mm (1.8 in) of rain is expected about once in 2 years. A day with at least 97.4 mm (3.8 in) of rain is expected about once in 100 years.
Rainfall return levels at Ontonagon 6 SE: the daily rain expected about once in a given number of years
Expected about once in
A day with at least
Note
2 years
44.9 mm (1.8 in)
5 years
56.2 mm (2.2 in)
10 years
64.7 mm (2.5 in)
25 years
76.7 mm (3.0 in)
50 years
86.6 mm (3.4 in)
Longer than the 36 years of record
100 years
97.4 mm (3.8 in)
Longer than the 36 years of record
The levels come from a generalised extreme value (GEV) distribution fitted by L-moments to the wettest-day total of each year, 36 years of values from 1978 to 2013.
A return level is an estimate. It is least reliable for the long periods, 50 and 100 years, and for any period longer than the record behind the fit, where the fit has to reach past the largest day actually observed. It is not a forecast.
The largest wettest-day totals in the fit: 99.1 mm (3.9 in) in 1978; 74.9 mm (2.9 in) in 1980; 63.8 mm (2.5 in) in 1987.
Download the Data
Data for Ontonagon 6 SE standing records by year: CSV or JSON. Field meanings are on the data page.
Data for Ontonagon 6 SE threshold days by year: CSV or JSON. Field meanings are on the data page.
Source: NOAA National Centers for Environmental Information, Global Historical Climatology Network Daily (GHCN-Daily). Records are computed by World Extreme Weather Monitor and are not official NOAA products. (US Government open data (NOAA NCEI)) Data as of 2026-10-16 (16 October 2026). Records are computed by this site and are not official.