Record highRecord low2026 daily maximum2026 daily minimum
The band shows the record high and record low for each calendar day at Iron River. 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 Iron River, with 2026 drawn through them
Month
Highest record high
Lowest record low
2026 highest maximum
2026 lowest minimum
Jan
11.1 C (52.0 F)
-51.2 C (-60.2 F)
n/a
n/a
Feb
14.4 C (57.9 F)
-50.0 C (-58.0 F)
n/a
n/a
Mar
16.1 C (61.0 F)
-44.4 C (-47.9 F)
n/a
n/a
Apr
32.8 C (91.0 F)
-35.0 C (-31.0 F)
n/a
n/a
May
34.4 C (93.9 F)
-12.2 C (10.0 F)
n/a
n/a
Jun
36.1 C (97.0 F)
-3.3 C (26.1 F)
n/a
n/a
Jul
36.1 C (97.0 F)
-0.6 C (30.9 F)
n/a
n/a
Aug
33.3 C (91.9 F)
-6.1 C (21.0 F)
n/a
n/a
Sep
30.6 C (87.1 F)
-14.4 C (6.1 F)
n/a
n/a
Oct
26.7 C (80.1 F)
-23.3 C (-9.9 F)
n/a
n/a
Nov
19.4 C (66.9 F)
-40.0 C (-40.0 F)
n/a
n/a
Dec
12.2 C (54.0 F)
-46.1 C (-51.0 F)
n/a
n/a
Which Years Hold Standing Records
1,464 standing records
Year with most
1,464 records at Iron River still stand. 1954 holds the most, with 60.
Standing records at Iron River by the year they were set
Year set
Standing records
1925
29
1926
52
1927
30
1928
40
1929
33
1930
25
1931
15
1932
28
1933
35
1934
37
1935
25
1936
59
1937
28
1938
26
1939
39
1940
34
1941
24
1942
35
1943
33
1944
30
1945
26
1946
19
1947
25
1948
24
1949
39
1950
42
1951
53
1952
20
1953
18
1954
60
1955
32
1956
32
1957
24
1958
19
1959
27
1960
14
1961
26
1962
24
1963
28
1964
26
1965
39
1966
19
1967
28
1968
25
1969
19
1970
21
1971
21
1972
23
1973
15
1974
17
1975
2
All-Time Record Progression
1 new records
1 all-time records were set at Iron River between 10 July 1964 and 10 July 1964. Each dot is a new record.
When Iron River set new all-time records
Date
Kind
Detail
1964-07-10
Record daily precipitation
Record daily precipitation 88.9 mm (3.5 in)
Wettest Day of Each Month
Jul: 88.9 mm (3.5 in)
The wettest day on record for each calendar month at Iron River. The most was 88.9 mm (3.5 in) on 10 July 1964.
Record daily precipitation for each month at Iron River
Month
Record daily precipitation (mm)
Date
Jan
20.3 mm (0.8 in)
6 January 1954
Feb
15.2 mm (0.6 in)
20 February 1958
Mar
25.4 mm (1.0 in)
30 March 1943
Apr
47.2 mm (1.9 in)
6 April 1943
May
58.4 mm (2.3 in)
30 May 1928
Jun
55.9 mm (2.2 in)
5 June 1962
Jul
88.9 mm (3.5 in)
10 July 1964
Aug
55.4 mm (2.2 in)
4 August 1945
Sep
58.7 mm (2.3 in)
1 September 1970
Oct
41.9 mm (1.6 in)
3 October 1927
Nov
48.3 mm (1.9 in)
1 November 1953
Dec
25.4 mm (1.0 in)
26 December 1946
Period of Record Coverage
1925 to 1975
Complete yearUnder 90 percent of days
51 years of record at Iron River, 1925 to 1975. 10 years have data for under 90 percent of days and are left out of rankings: 1925, 1929, 1930, 1931, 1934, 1935, 1960, 1961 and others.
Cooler than the station meanWarmer than the station mean
One stripe for each of 41 complete years at Iron River, 1926 to 1974. Blue stripes are years cooler than the station's own mean of 0.6 C (33.2 F); red stripes are warmer. The coolest year was 1951, at -1.3 C (29.7 F), and the warmest was 1944, at 2.2 C (36.0 F). The strongest colour marks a difference of 2.0 C (3.6 F).
Annual mean temperature at Iron River as warming stripes, 1926 to 1974
Year
Annual mean temperature
Difference from the station mean
1926
1.2 C
+0.52 C
1927
-1.0 C
-1.60 C
1928
1.9 C
+1.22 C
1932
0.1 C
-0.53 C
1933
-1.2 C
-1.83 C
1936
-0.3 C
-0.93 C
1937
-0.3 C
-0.92 C
1938
1.7 C
+1.08 C
1939
0.9 C
+0.28 C
1940
1.0 C
+0.36 C
1941
1.1 C
+0.50 C
1942
1.1 C
+0.48 C
1943
1.5 C
+0.84 C
1944
2.2 C
+1.58 C
1945
-0.3 C
-0.91 C
1946
0.1 C
-0.54 C
1947
0.3 C
-0.31 C
1948
0.4 C
-0.28 C
1949
0.7 C
+0.04 C
1950
-1.2 C
-1.86 C
1951
-1.3 C
-1.90 C
1952
2.0 C
+1.34 C
1953
1.7 C
+1.10 C
1954
1.1 C
+0.41 C
1955
-0.3 C
-0.93 C
1956
0.8 C
+0.18 C
1957
1.2 C
+0.60 C
1958
1.7 C
+1.10 C
1959
0.9 C
+0.27 C
1962
1.0 C
+0.31 C
1963
1.9 C
+1.26 C
1964
1.2 C
+0.51 C
1965
-0.4 C
-1.04 C
1966
0.0 C
-0.62 C
1967
0.4 C
-0.20 C
1968
1.7 C
+1.01 C
1969
0.4 C
-0.29 C
1970
0.6 C
-0.08 C
1971
0.8 C
+0.17 C
1972
0.0 C
-0.69 C
1974
1.1 C
+0.43 C
The fitted trend in annual mean temperature here over 1926 to 1974 is 0.1 C (-0.1 to 0.3) per decade. The interval includes zero, so the trend is not clearly different from zero. In Fahrenheit: 0.1 F (-0.3 to 0.5) per decade. The slope is a straight line fitted to 41 complete years; the brackets give its 95 percent interval.
Fitted temperature trends per decade at Iron River
Measure
Per decade (C)
Per decade (F)
Period
Complete years
Reading
Annual mean temperature
0.1 C (-0.1 to 0.3) per decade
0.1 F (-0.3 to 0.5) per decade
1926 to 1974
41
Not clearly different from zero
Mean daily maximum
-0.1 C (-0.4 to 0.1) per decade
-0.2 F (-0.7 to 0.2) per decade
1926 to 1974
41
Not clearly different from zero
Mean daily minimum
0.27 C (0.05 to 0.49) per decade
0.5 F (0.1 to 0.9) per decade
1926 to 1974
41
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
1925 to 1975
Yearly extremes at Iron River: the record and the median year
Measure
Record
Year of the record
Median year
Years with a value
Hottest day (TXx)
36.1 C (97.0 F)
1937
31.1 C (88.0 F)
51
Coldest night (TNn)
-51.2 C (-60.2 F)
1943
-43.3 C (-45.9 F)
51
Wettest day (Rx1day)
88.9 mm (3.5 in)
1964
35.6 mm (1.4 in)
51
Wettest five days (Rx5day)
119.6 mm (4.7 in)
1973
50.1 mm (2.0 in)
51
Longest dry spell (CDD)
86 days
1956
32 days
51
Hottest day (TXx)
The hottest day of the year at Iron River, 1925 to 1975. The record is 36.1 C (97.0 F) in 1937, marked on the chart; the median year is 31.1 C (88.0 F).
Hottest day (TXx) at Iron River by year
Year
Hottest day (TXx)
1925
33.3 C (91.9 F)
1926
33.9 C (93.0 F)
1927
31.1 C (88.0 F)
1928
31.7 C (89.1 F)
1929
30.0 C (86.0 F)
1930
32.2 C (90.0 F)
1931
11.1 C (52.0 F)
1932
30.0 C (86.0 F)
1933
31.7 C (89.1 F)
1934
31.1 C (88.0 F)
1935
33.3 C (91.9 F)
1936
34.4 C (93.9 F)
1937
36.1 C (97.0 F)
1938
32.2 C (90.0 F)
1939
32.8 C (91.0 F)
1940
31.7 C (89.1 F)
1941
36.1 C (97.0 F)
1942
31.1 C (88.0 F)
1943
28.9 C (84.0 F)
1944
29.4 C (84.9 F)
1945
29.4 C (84.9 F)
1946
32.8 C (91.0 F)
1947
30.0 C (86.0 F)
1948
30.6 C (87.1 F)
1949
32.8 C (91.0 F)
1950
35.0 C (95.0 F)
1951
30.6 C (87.1 F)
1952
28.3 C (82.9 F)
1953
30.6 C (87.1 F)
1954
31.7 C (89.1 F)
1955
32.8 C (91.0 F)
1956
30.6 C (87.1 F)
1957
30.6 C (87.1 F)
1958
33.9 C (93.0 F)
1959
30.6 C (87.1 F)
1960
31.7 C (89.1 F)
1961
31.1 C (88.0 F)
1962
30.0 C (86.0 F)
1963
30.6 C (87.1 F)
1964
34.4 C (93.9 F)
1965
31.1 C (88.0 F)
1966
29.4 C (84.9 F)
1967
30.0 C (86.0 F)
1968
31.7 C (89.1 F)
1969
31.1 C (88.0 F)
1970
35.6 C (96.1 F)
1971
31.7 C (89.1 F)
1972
31.7 C (89.1 F)
1973
30.6 C (87.1 F)
1974
30.6 C (87.1 F)
1975
30.0 C (86.0 F)
Coldest night (TNn)
The coldest night of the year at Iron River, 1925 to 1975. The record is -51.2 C (-60.2 F) in 1943, marked on the chart; the median year is -43.3 C (-45.9 F).
Coldest night (TNn) at Iron River by year
Year
Coldest night (TNn)
1925
-33.3 C (-27.9 F)
1926
-38.3 C (-36.9 F)
1927
-40.6 C (-41.1 F)
1928
-44.4 C (-47.9 F)
1929
-49.4 C (-56.9 F)
1930
-47.2 C (-53.0 F)
1931
-36.1 C (-33.0 F)
1932
-46.1 C (-51.0 F)
1933
-43.3 C (-45.9 F)
1934
-42.2 C (-44.0 F)
1935
-47.2 C (-53.0 F)
1936
-48.3 C (-54.9 F)
1937
-46.7 C (-52.1 F)
1938
-46.1 C (-51.0 F)
1939
-47.8 C (-54.0 F)
1940
-41.1 C (-42.0 F)
1941
-46.1 C (-51.0 F)
1942
-38.9 C (-38.0 F)
1943
-51.2 C (-60.2 F)
1944
-40.0 C (-40.0 F)
1945
-42.8 C (-45.0 F)
1946
-45.0 C (-49.0 F)
1947
-50.0 C (-58.0 F)
1948
-42.8 C (-45.0 F)
1949
-43.9 C (-47.0 F)
1950
-50.0 C (-58.0 F)
1951
-44.4 C (-47.9 F)
1952
-40.0 C (-40.0 F)
1953
-41.1 C (-42.0 F)
1954
-48.3 C (-54.9 F)
1955
-38.9 C (-38.0 F)
1956
-39.4 C (-38.9 F)
1957
-38.9 C (-38.0 F)
1958
-38.9 C (-38.0 F)
1959
-42.8 C (-45.0 F)
1960
-38.3 C (-36.9 F)
1961
-40.0 C (-40.0 F)
1962
-45.0 C (-49.0 F)
1963
-40.0 C (-40.0 F)
1964
-39.4 C (-38.9 F)
1965
-42.8 C (-45.0 F)
1966
-46.7 C (-52.1 F)
1967
-44.4 C (-47.9 F)
1968
-45.0 C (-49.0 F)
1969
-46.1 C (-51.0 F)
1970
-43.3 C (-45.9 F)
1971
-45.0 C (-49.0 F)
1972
-47.8 C (-54.0 F)
1973
-42.2 C (-44.0 F)
1974
-40.6 C (-41.1 F)
1975
-39.4 C (-38.9 F)
Wettest day (Rx1day)
The wettest day of the year at Iron River, 1925 to 1975. The record is 88.9 mm (3.5 in) in 1964, marked on the chart; the median year is 35.6 mm (1.4 in).
Wettest day (Rx1day) at Iron River by year
Year
Wettest day (Rx1day)
1925
13.7 mm (0.5 in)
1926
22.9 mm (0.9 in)
1927
57.2 mm (2.3 in)
1928
58.4 mm (2.3 in)
1929
7.6 mm (0.30 in)
1930
53.1 mm (2.1 in)
1931
12.7 mm (0.5 in)
1932
39.6 mm (1.6 in)
1933
49.0 mm (1.9 in)
1934
47.8 mm (1.9 in)
1935
30.5 mm (1.2 in)
1936
27.4 mm (1.1 in)
1937
34.5 mm (1.4 in)
1938
21.8 mm (0.9 in)
1939
26.4 mm (1.0 in)
1940
45.7 mm (1.8 in)
1941
41.4 mm (1.6 in)
1942
43.2 mm (1.7 in)
1943
47.2 mm (1.9 in)
1944
30.2 mm (1.2 in)
1945
55.4 mm (2.2 in)
1946
25.4 mm (1.0 in)
1947
55.9 mm (2.2 in)
1948
35.6 mm (1.4 in)
1949
28.4 mm (1.1 in)
1950
28.7 mm (1.1 in)
1951
29.2 mm (1.1 in)
1952
36.8 mm (1.4 in)
1953
48.3 mm (1.9 in)
1954
35.1 mm (1.4 in)
1955
41.4 mm (1.6 in)
1956
38.9 mm (1.5 in)
1957
20.6 mm (0.8 in)
1958
15.2 mm (0.6 in)
1959
35.6 mm (1.4 in)
1960
42.7 mm (1.7 in)
1961
31.8 mm (1.3 in)
1962
55.9 mm (2.2 in)
1963
12.7 mm (0.5 in)
1964
88.9 mm (3.5 in)
1965
52.8 mm (2.1 in)
1966
23.1 mm (0.9 in)
1967
16.3 mm (0.6 in)
1968
51.3 mm (2.0 in)
1969
34.0 mm (1.3 in)
1970
58.7 mm (2.3 in)
1971
37.6 mm (1.5 in)
1972
25.1 mm (1.0 in)
1973
53.1 mm (2.1 in)
1974
23.6 mm (0.9 in)
1975
22.4 mm (0.9 in)
Wettest five days (Rx5day)
The wettest five days of the year at Iron River, 1925 to 1975. The record is 119.6 mm (4.7 in) in 1973, marked on the chart; the median year is 50.1 mm (2.0 in).
Wettest five days (Rx5day) at Iron River by year
Year
Wettest five days (Rx5day)
1925
29.0 mm (1.1 in)
1926
22.9 mm (0.9 in)
1927
76.8 mm (3.0 in)
1928
72.4 mm (2.9 in)
1929
8.6 mm (0.34 in)
1930
81.0 mm (3.2 in)
1931
12.7 mm (0.5 in)
1932
56.1 mm (2.2 in)
1933
60.4 mm (2.4 in)
1934
54.7 mm (2.2 in)
1935
57.5 mm (2.3 in)
1936
42.9 mm (1.7 in)
1937
52.8 mm (2.1 in)
1938
46.4 mm (1.8 in)
1939
41.4 mm (1.6 in)
1940
45.7 mm (1.8 in)
1941
51.8 mm (2.0 in)
1942
43.2 mm (1.7 in)
1943
47.2 mm (1.9 in)
1944
82.6 mm (3.3 in)
1945
60.0 mm (2.4 in)
1946
54.9 mm (2.2 in)
1947
58.4 mm (2.3 in)
1948
61.6 mm (2.4 in)
1949
35.6 mm (1.4 in)
1950
30.5 mm (1.2 in)
1951
36.0 mm (1.4 in)
1952
53.3 mm (2.1 in)
1953
59.2 mm (2.3 in)
1954
65.7 mm (2.6 in)
1955
43.2 mm (1.7 in)
1956
73.2 mm (2.9 in)
1957
43.1 mm (1.7 in)
1958
26.1 mm (1.0 in)
1959
37.1 mm (1.5 in)
1960
50.1 mm (2.0 in)
1961
47.8 mm (1.9 in)
1962
113.6 mm (4.5 in)
1963
22.6 mm (0.9 in)
1964
108.7 mm (4.3 in)
1965
73.8 mm (2.9 in)
1966
29.2 mm (1.1 in)
1967
31.5 mm (1.2 in)
1968
63.0 mm (2.5 in)
1969
55.8 mm (2.2 in)
1970
118.1 mm (4.6 in)
1971
42.6 mm (1.7 in)
1972
39.3 mm (1.5 in)
1973
119.6 mm (4.7 in)
1974
32.6 mm (1.3 in)
1975
39.2 mm (1.5 in)
Longest dry spell (CDD)
The longest dry spell of the year at Iron River, 1925 to 1975. The record is 86 days in 1956, marked on the chart; the median year is 32 days.
Longest dry spell (CDD) at Iron River by year
Year
Longest dry spell (CDD)
1925
20 days
1926
30 days
1927
25 days
1928
51 days
1929
38 days
1930
20 days
1931
30 days
1932
38 days
1933
31 days
1934
28 days
1935
19 days
1936
49 days
1937
29 days
1938
38 days
1939
29 days
1940
22 days
1941
45 days
1942
50 days
1943
33 days
1944
44 days
1945
31 days
1946
22 days
1947
44 days
1948
45 days
1949
32 days
1950
51 days
1951
49 days
1952
31 days
1953
31 days
1954
31 days
1955
27 days
1956
86 days
1957
32 days
1958
41 days
1959
38 days
1960
40 days
1961
25 days
1962
26 days
1963
21 days
1964
20 days
1965
32 days
1966
30 days
1967
54 days
1968
36 days
1969
24 days
1970
55 days
1971
37 days
1972
19 days
1973
46 days
1974
34 days
1975
19 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
41 years with a frost
Across 41 years with a frost, the median last spring frost at Iron River falls on 7 June and the median first autumn frost on 30 August, which leaves a median of 86 days between them.
Fitted over all years, the growing season changes by +11.5 days per decade at this station.
Frost dates and growing season at Iron River
Measure
Median, all years
Earliest period
Recent period (1942 to 1974)
Recent against earliest
Fitted trend
Last spring frost
7 June
n/a
3 June
n/a
-5.4 days per decade
First autumn frost
30 August
n/a
4 September
n/a
+6.1 days per decade
Growing days
86 days
n/a
95 days
n/a
+11.5 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
38 years, 1926 to 1974
A day with at least 37.6 mm (1.5 in) of rain is expected about once in 2 years. A day with at least 83.4 mm (3.3 in) of rain is expected about once in 100 years.
Rainfall return levels at Iron River: the daily rain expected about once in a given number of years
Expected about once in
A day with at least
Note
2 years
37.6 mm (1.5 in)
5 years
50.7 mm (2.0 in)
10 years
59.0 mm (2.3 in)
25 years
69.1 mm (2.7 in)
50 years
76.4 mm (3.0 in)
Longer than the 38 years of record
100 years
83.4 mm (3.3 in)
Longer than the 38 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, 38 years of values from 1926 to 1974.
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: 88.9 mm (3.5 in) in 1964; 58.7 mm (2.3 in) in 1970; 58.4 mm (2.3 in) in 1928.
Station Changes
No change in the annual mean temperature of this station was found against its neighbours.
Download the Data
Data for Iron River standing records by year: CSV or JSON. Field meanings are on the data page.
Data for Iron River 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 2026-10-14 (14 October 2026). Records are computed by this site and are not official.