Record envelope, standing records and threshold days for Idaho City (USC00104442), Idaho, United States, with 120 years of record.
Key Facts for Idaho City
Idaho City (USC00104442) is a weather station in Idaho, United States at 43.84 latitude and -115.83 longitude, 1,209 m (3,965 ft) above sea level.
The station reports from 1894 to 2013, 120 years of record.
1,464 records set at Idaho City still stand.
Records are tracked for tmax, tmin, prcp, snow, snwd: an element needs 30 years of data to be eligible.
Idaho City tied a daily record low maximum temperature of -8.3 C (17.1 F) on 15 January 2013.
About the Station
Location: Idaho, United States, 43.84 latitude, -115.83 longitude.
Elevation: 1,209 m (3,965 ft).
Period of record: 1894 to 2013, 120 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 Idaho City. 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 Idaho City, with 2026 drawn through them
Month
Highest record high
Lowest record low
2026 highest maximum
2026 lowest minimum
Jan
23.9 C (75.0 F)
-38.9 C (-38.0 F)
n/a
n/a
Feb
24.4 C (75.9 F)
-37.2 C (-35.0 F)
n/a
n/a
Mar
25.6 C (78.1 F)
-28.9 C (-20.0 F)
n/a
n/a
Apr
31.7 C (89.1 F)
-22.2 C (-8.0 F)
n/a
n/a
May
36.1 C (97.0 F)
-11.7 C (10.9 F)
n/a
n/a
Jun
41.1 C (106.0 F)
-6.7 C (19.9 F)
n/a
n/a
Jul
42.8 C (109.0 F)
-3.3 C (26.1 F)
n/a
n/a
Aug
41.1 C (106.0 F)
-4.4 C (24.1 F)
n/a
n/a
Sep
37.8 C (100.0 F)
-11.7 C (10.9 F)
n/a
n/a
Oct
33.9 C (93.0 F)
-16.7 C (1.9 F)
n/a
n/a
Nov
23.9 C (75.0 F)
-27.8 C (-18.0 F)
n/a
n/a
Dec
21.1 C (70.0 F)
-35.6 C (-32.1 F)
n/a
n/a
Which Years Hold Standing Records
1,464 standing records
Year with most
1,464 records at Idaho City still stand. 1934 holds the most, with 48.
Standing records at Idaho City by the year they were set
Year set
Standing records
1894
23
1895
21
1896
32
1897
24
1898
10
1899
18
1900
7
1901
27
1902
14
1903
2
1904
31
1905
16
1916
18
1917
27
1918
15
1919
35
1920
8
1921
15
1922
12
1923
3
1924
26
1925
24
1926
47
1927
19
1928
10
1929
20
1930
11
1931
24
1932
14
1933
22
1934
48
1935
14
1936
28
1937
22
1938
6
1939
20
1940
21
1941
2
1942
20
1943
7
1944
5
1945
7
1946
6
1947
11
1948
6
1949
25
1950
12
1951
10
1952
5
1953
9
1954
11
1955
17
1956
14
1957
3
1958
8
1959
6
1960
10
1961
9
1962
16
1963
18
1964
15
1965
8
1966
11
1967
7
1968
8
1969
11
1970
7
1971
9
1972
14
1973
7
1974
7
1975
11
1976
10
1977
11
1978
18
1979
7
1980
7
1981
21
1982
5
1983
18
1984
13
1985
17
1986
15
1987
12
1988
7
1989
11
1990
19
1991
5
1992
21
1993
15
1994
4
1995
12
1996
8
1997
8
1998
6
1999
10
2000
4
2001
9
2002
13
2003
9
2004
4
2005
3
2006
12
2007
4
2008
11
2009
9
2010
12
2011
2
2012
2
2013
4
All-Time Record Progression
6 new records
6 all-time records were set at Idaho City between 8 January 1937 and 23 December 1990. Each dot is a new record.
When Idaho City set new all-time records
Date
Kind
Detail
1937-01-08
Record low maximum temperature
Record low maximum temperature -15.0 C (5.0 F)
1937-01-08
Record low minimum temperature
Record low minimum temperature -37.2 C (-35.0 F)
1937-01-21
Record low minimum temperature
Record low minimum temperature -38.9 C (-38.0 F)
1957-02-01
Record daily snowfall
Record daily snowfall 61.2 cm (24.1 in)
1990-12-22
Record low maximum temperature
Record low maximum temperature -17.8 C (0.0 F)
1990-12-23
Record low maximum temperature
Record low maximum temperature -18.3 C (-0.9 F)
Wettest Day of Each Month
Dec: 115.6 mm (4.6 in)
The wettest day on record for each calendar month at Idaho City. The most was 115.6 mm (4.6 in) on 16 December 1929.
Record daily precipitation for each month at Idaho City
Month
Record daily precipitation (mm)
Date
Jan
54.6 mm (2.1 in)
5 January 1943
Feb
53.1 mm (2.1 in)
1 February 1963
Mar
60.5 mm (2.4 in)
31 March 1928
Apr
40.6 mm (1.6 in)
13 April 1900
May
40.1 mm (1.6 in)
20 May 1923
Jun
66.3 mm (2.6 in)
12 June 1958
Jul
50.8 mm (2.0 in)
4 July 1902
Aug
40.6 mm (1.6 in)
11 August 1941
Sep
45.0 mm (1.8 in)
20 September 1982
Oct
71.1 mm (2.8 in)
19 October 1900
Nov
63.5 mm (2.5 in)
20 November 1921
Dec
115.6 mm (4.6 in)
16 December 1929
Period of Record Coverage
1894 to 2013
Complete yearUnder 90 percent of days
110 years of record at Idaho City, 1894 to 2013. 21 years have data for under 90 percent of days and are left out of rankings: 1894, 1896, 1897, 1898, 1899, 1900, 1901, 1902 and others.
Cooler than the station meanWarmer than the station mean
One stripe for each of 85 complete years at Idaho City, 1895 to 2012. Blue stripes are years cooler than the station's own mean of 7.0 C (44.6 F); red stripes are warmer. The coolest year was 1985, at 5.0 C (41.0 F), and the warmest was 1934, at 9.8 C (49.6 F). The strongest colour marks a difference of 2.8 C (5.0 F).
Annual mean temperature at Idaho City as warming stripes, 1895 to 2012
Year
Annual mean temperature
Difference from the station mean
1895
6.9 C
-0.13 C
1897
7.2 C
+0.18 C
1922
7.0 C
0.00 C
1923
7.1 C
+0.13 C
1925
9.0 C
+1.98 C
1926
9.3 C
+2.25 C
1927
7.5 C
+0.44 C
1928
7.6 C
+0.61 C
1929
6.8 C
-0.21 C
1930
6.9 C
-0.14 C
1931
7.5 C
+0.48 C
1932
6.4 C
-0.62 C
1933
7.1 C
+0.07 C
1934
9.8 C
+2.77 C
1935
6.8 C
-0.26 C
1936
7.6 C
+0.56 C
1937
6.7 C
-0.30 C
1938
7.7 C
+0.65 C
1939
8.3 C
+1.29 C
1940
8.9 C
+1.89 C
1941
7.9 C
+0.93 C
1942
6.6 C
-0.37 C
1943
7.1 C
+0.05 C
1944
7.0 C
+0.01 C
1945
7.0 C
+0.01 C
1946
6.7 C
-0.34 C
1947
7.3 C
+0.30 C
1948
6.0 C
-0.97 C
1949
6.3 C
-0.76 C
1950
6.7 C
-0.34 C
1951
6.1 C
-0.89 C
1952
6.5 C
-0.53 C
1953
7.6 C
+0.54 C
1954
7.2 C
+0.20 C
1955
5.4 C
-1.57 C
1957
6.6 C
-0.43 C
1958
7.8 C
+0.81 C
1959
7.1 C
+0.08 C
1960
6.9 C
-0.12 C
1961
7.5 C
+0.50 C
1962
6.8 C
-0.22 C
1963
7.5 C
+0.53 C
1964
5.9 C
-1.10 C
1965
6.9 C
-0.09 C
1966
7.7 C
+0.65 C
1967
7.8 C
+0.75 C
1968
7.2 C
+0.17 C
1969
7.2 C
+0.15 C
1970
6.9 C
-0.14 C
1971
6.6 C
-0.45 C
1972
6.6 C
-0.46 C
1973
7.6 C
+0.55 C
1974
7.2 C
+0.17 C
1975
6.5 C
-0.54 C
1976
6.8 C
-0.18 C
1977
6.9 C
-0.11 C
1978
7.2 C
+0.17 C
1979
7.2 C
+0.17 C
1981
8.5 C
+1.49 C
1982
6.5 C
-0.55 C
1983
7.5 C
+0.53 C
1984
6.2 C
-0.80 C
1985
5.0 C
-2.01 C
1986
7.4 C
+0.35 C
1987
7.2 C
+0.20 C
1988
7.0 C
-0.05 C
1989
6.3 C
-0.73 C
1990
6.5 C
-0.54 C
1991
6.7 C
-0.29 C
1992
7.5 C
+0.46 C
1993
5.2 C
-1.80 C
1994
7.2 C
+0.14 C
1995
6.9 C
-0.12 C
1996
6.7 C
-0.34 C
1997
6.8 C
-0.23 C
1998
7.4 C
+0.42 C
1999
6.5 C
-0.52 C
2000
6.8 C
-0.22 C
2001
6.9 C
-0.10 C
2002
6.5 C
-0.49 C
2004
6.7 C
-0.34 C
2006
6.6 C
-0.45 C
2009
6.1 C
-0.87 C
2011
5.5 C
-1.48 C
2012
6.8 C
-0.22 C
The annual mean temperature here has fallen by 0.10 C (0.04 to 0.16) per decade over 1895 to 2012. In Fahrenheit: 0.2 F (0.1 to 0.3) per decade. The slope is a straight line fitted to 85 complete years; the brackets give its 95 percent interval.
Fitted temperature trends per decade at Idaho City
Measure
Per decade (C)
Per decade (F)
Period
Complete years
Reading
Annual mean temperature
-0.10 C (-0.16 to -0.04) per decade
-0.2 F (-0.3 to -0.1) per decade
1895 to 2012
85
Fall
Mean daily maximum
-0.2 C (-0.3 to -0.2) per decade
-0.4 F (-0.6 to -0.3) per decade
1895 to 2012
85
Fall
Mean daily minimum
0.04 C (-0.04 to 0.12) per decade
0.1 F (-0.1 to 0.2) per decade
1895 to 2012
85
Not clearly different from zero
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
1894 to 2013
Yearly extremes at Idaho City: the record and the median year
Measure
Record
Year of the record
Median year
Years with a value
Hottest day (TXx)
42.8 C (109.0 F)
1934
37.5 C (99.5 F)
110
Coldest night (TNn)
-38.9 C (-38.0 F)
1937
-25.6 C (-14.1 F)
110
Wettest day (Rx1day)
115.6 mm (4.6 in)
1929
34.5 mm (1.4 in)
117
Wettest five days (Rx5day)
174.4 mm (6.9 in)
1955
64.1 mm (2.5 in)
117
Longest dry spell (CDD)
136 days
1905
42 days
117
Hottest day (TXx)
The hottest day of the year at Idaho City, 1894 to 2013. The record is 42.8 C (109.0 F) in 1934, marked on the chart; the median year is 37.5 C (99.5 F).
Hottest day (TXx) at Idaho City by year
Year
Hottest day (TXx)
1894
40.0 C (104.0 F)
1895
36.7 C (98.1 F)
1896
36.7 C (98.1 F)
1897
38.3 C (100.9 F)
1898
37.2 C (99.0 F)
1899
36.1 C (97.0 F)
1900
39.4 C (102.9 F)
1901
38.3 C (100.9 F)
1902
32.2 C (90.0 F)
1903
32.2 C (90.0 F)
1904
38.3 C (100.9 F)
1905
34.4 C (93.9 F)
1909
n/a
1910
n/a
1911
n/a
1912
n/a
1913
n/a
1914
n/a
1915
n/a
1916
35.0 C (95.0 F)
1917
36.7 C (98.1 F)
1918
38.3 C (100.9 F)
1919
36.1 C (97.0 F)
1920
39.4 C (102.9 F)
1921
35.0 C (95.0 F)
1922
37.8 C (100.0 F)
1923
37.2 C (99.0 F)
1924
39.4 C (102.9 F)
1925
40.6 C (105.1 F)
1926
39.4 C (102.9 F)
1927
38.3 C (100.9 F)
1928
40.6 C (105.1 F)
1929
38.9 C (102.0 F)
1930
37.8 C (100.0 F)
1931
41.1 C (106.0 F)
1932
38.3 C (100.9 F)
1933
42.2 C (108.0 F)
1934
42.8 C (109.0 F)
1935
40.6 C (105.1 F)
1936
41.1 C (106.0 F)
1937
38.3 C (100.9 F)
1938
37.2 C (99.0 F)
1939
40.0 C (104.0 F)
1940
41.1 C (106.0 F)
1941
37.8 C (100.0 F)
1942
40.0 C (104.0 F)
1943
38.9 C (102.0 F)
1944
36.1 C (97.0 F)
1945
36.7 C (98.1 F)
1946
38.9 C (102.0 F)
1947
36.7 C (98.1 F)
1948
36.1 C (97.0 F)
1949
38.3 C (100.9 F)
1950
37.8 C (100.0 F)
1951
36.7 C (98.1 F)
1952
35.6 C (96.1 F)
1953
37.2 C (99.0 F)
1954
36.1 C (97.0 F)
1955
37.2 C (99.0 F)
1956
36.7 C (98.1 F)
1957
35.0 C (95.0 F)
1958
36.7 C (98.1 F)
1959
38.3 C (100.9 F)
1960
40.6 C (105.1 F)
1961
41.1 C (106.0 F)
1962
36.1 C (97.0 F)
1963
35.6 C (96.1 F)
1964
36.1 C (97.0 F)
1965
36.1 C (97.0 F)
1966
37.2 C (99.0 F)
1967
37.8 C (100.0 F)
1968
37.8 C (100.0 F)
1969
37.8 C (100.0 F)
1970
36.1 C (97.0 F)
1971
36.7 C (98.1 F)
1972
36.7 C (98.1 F)
1973
39.4 C (102.9 F)
1974
36.1 C (97.0 F)
1975
37.8 C (100.0 F)
1976
36.1 C (97.0 F)
1977
36.1 C (97.0 F)
1978
36.1 C (97.0 F)
1979
37.2 C (99.0 F)
1980
38.3 C (100.9 F)
1981
39.4 C (102.9 F)
1982
35.0 C (95.0 F)
1983
40.0 C (104.0 F)
1984
37.2 C (99.0 F)
1985
37.2 C (99.0 F)
1986
36.7 C (98.1 F)
1987
37.2 C (99.0 F)
1988
38.3 C (100.9 F)
1989
38.9 C (102.0 F)
1990
39.4 C (102.9 F)
1991
37.2 C (99.0 F)
1992
37.8 C (100.0 F)
1993
34.4 C (93.9 F)
1994
38.3 C (100.9 F)
1995
36.1 C (97.0 F)
1996
37.2 C (99.0 F)
1997
36.7 C (98.1 F)
1998
38.9 C (102.0 F)
1999
37.2 C (99.0 F)
2000
38.3 C (100.9 F)
2001
38.9 C (102.0 F)
2002
41.7 C (107.1 F)
2003
40.0 C (104.0 F)
2004
36.7 C (98.1 F)
2005
37.8 C (100.0 F)
2006
38.9 C (102.0 F)
2007
40.6 C (105.1 F)
2008
37.2 C (99.0 F)
2009
37.2 C (99.0 F)
2010
36.1 C (97.0 F)
2011
35.6 C (96.1 F)
2012
37.8 C (100.0 F)
2013
5.6 C (42.1 F)
Coldest night (TNn)
The coldest night of the year at Idaho City, 1894 to 2013. The record is -38.9 C (-38.0 F) in 1937, marked on the chart; the median year is -25.6 C (-14.1 F).
Coldest night (TNn) at Idaho City by year
Year
Coldest night (TNn)
1894
-23.9 C (-11.0 F)
1895
-24.4 C (-11.9 F)
1896
-27.8 C (-18.0 F)
1897
-25.0 C (-13.0 F)
1898
-27.2 C (-17.0 F)
1899
-23.3 C (-9.9 F)
1900
-20.6 C (-5.1 F)
1901
-21.7 C (-7.1 F)
1902
-26.7 C (-16.1 F)
1903
-13.3 C (8.1 F)
1904
-30.6 C (-23.1 F)
1905
-32.8 C (-27.0 F)
1909
n/a
1910
n/a
1911
n/a
1912
n/a
1913
n/a
1914
n/a
1915
n/a
1916
-25.6 C (-14.1 F)
1917
-30.0 C (-22.0 F)
1918
-24.4 C (-11.9 F)
1919
-33.9 C (-29.0 F)
1920
-23.3 C (-9.9 F)
1921
-18.3 C (-0.9 F)
1922
-32.2 C (-26.0 F)
1923
-28.3 C (-18.9 F)
1924
-29.4 C (-20.9 F)
1925
-18.3 C (-0.9 F)
1926
-25.6 C (-14.1 F)
1927
-31.7 C (-25.1 F)
1928
-23.3 C (-9.9 F)
1929
-31.7 C (-25.1 F)
1930
-33.3 C (-27.9 F)
1931
-26.1 C (-15.0 F)
1932
-27.8 C (-18.0 F)
1933
-36.7 C (-34.1 F)
1934
-17.2 C (1.0 F)
1935
-22.2 C (-8.0 F)
1936
-30.6 C (-23.1 F)
1937
-38.9 C (-38.0 F)
1938
-21.1 C (-6.0 F)
1939
-27.2 C (-17.0 F)
1940
-20.6 C (-5.1 F)
1941
-24.4 C (-11.9 F)
1942
-30.0 C (-22.0 F)
1943
-35.0 C (-31.0 F)
1944
-22.2 C (-8.0 F)
1945
-23.9 C (-11.0 F)
1946
-23.9 C (-11.0 F)
1947
-32.8 C (-27.0 F)
1948
-31.7 C (-25.1 F)
1949
-35.0 C (-31.0 F)
1950
-37.2 C (-35.0 F)
1951
-32.8 C (-27.0 F)
1952
-28.9 C (-20.0 F)
1953
-21.7 C (-7.1 F)
1954
-26.1 C (-15.0 F)
1955
-28.9 C (-20.0 F)
1956
-34.4 C (-29.9 F)
1957
-31.1 C (-24.0 F)
1958
-21.1 C (-6.0 F)
1959
-27.8 C (-18.0 F)
1960
-25.6 C (-14.1 F)
1961
-22.2 C (-8.0 F)
1962
-35.6 C (-32.1 F)
1963
-28.3 C (-18.9 F)
1964
-32.2 C (-26.0 F)
1965
-22.2 C (-8.0 F)
1966
-22.8 C (-9.0 F)
1967
-25.0 C (-13.0 F)
1968
-22.8 C (-9.0 F)
1969
-23.3 C (-9.9 F)
1970
-23.3 C (-9.9 F)
1971
-28.3 C (-18.9 F)
1972
-29.4 C (-20.9 F)
1973
-20.0 C (-4.0 F)
1974
-27.8 C (-18.0 F)
1975
-23.3 C (-9.9 F)
1976
-24.4 C (-11.9 F)
1977
-23.3 C (-9.9 F)
1978
-30.6 C (-23.1 F)
1979
-31.1 C (-24.0 F)
1980
-27.8 C (-18.0 F)
1981
-20.6 C (-5.1 F)
1982
-30.6 C (-23.1 F)
1983
-32.8 C (-27.0 F)
1984
-28.9 C (-20.0 F)
1985
-28.9 C (-20.0 F)
1986
-19.4 C (-2.9 F)
1987
-25.0 C (-13.0 F)
1988
-26.7 C (-16.1 F)
1989
-31.1 C (-24.0 F)
1990
-35.6 C (-32.1 F)
1991
-21.7 C (-7.1 F)
1992
-25.6 C (-14.1 F)
1993
-25.0 C (-13.0 F)
1994
-23.3 C (-9.9 F)
1995
-22.2 C (-8.0 F)
1996
-30.6 C (-23.1 F)
1997
-22.8 C (-9.0 F)
1998
-23.9 C (-11.0 F)
1999
-20.0 C (-4.0 F)
2000
-20.6 C (-5.1 F)
2001
-21.7 C (-7.1 F)
2002
-25.0 C (-13.0 F)
2003
-17.8 C (0.0 F)
2004
-27.8 C (-18.0 F)
2005
-22.8 C (-9.0 F)
2006
-22.2 C (-8.0 F)
2007
-22.8 C (-9.0 F)
2008
-26.1 C (-15.0 F)
2009
-24.4 C (-11.9 F)
2010
-26.1 C (-15.0 F)
2011
-27.2 C (-17.0 F)
2012
-18.9 C (-2.0 F)
2013
-25.6 C (-14.1 F)
Wettest day (Rx1day)
The wettest day of the year at Idaho City, 1894 to 2013. The record is 115.6 mm (4.6 in) in 1929, marked on the chart; the median year is 34.5 mm (1.4 in).
Wettest day (Rx1day) at Idaho City by year
Year
Wettest day (Rx1day)
1894
37.1 mm (1.5 in)
1895
30.0 mm (1.2 in)
1896
39.9 mm (1.6 in)
1897
35.3 mm (1.4 in)
1898
18.3 mm (0.7 in)
1899
48.3 mm (1.9 in)
1900
71.1 mm (2.8 in)
1901
51.8 mm (2.0 in)
1902
50.8 mm (2.0 in)
1903
9.9 mm (0.39 in)
1904
21.1 mm (0.8 in)
1905
21.8 mm (0.9 in)
1909
47.0 mm (1.9 in)
1910
25.9 mm (1.0 in)
1911
25.4 mm (1.0 in)
1912
40.6 mm (1.6 in)
1913
39.6 mm (1.6 in)
1914
45.7 mm (1.8 in)
1915
27.9 mm (1.1 in)
1916
50.8 mm (2.0 in)
1917
33.0 mm (1.3 in)
1918
22.1 mm (0.9 in)
1919
27.7 mm (1.1 in)
1920
50.8 mm (2.0 in)
1921
63.5 mm (2.5 in)
1922
23.9 mm (0.9 in)
1923
40.1 mm (1.6 in)
1924
40.1 mm (1.6 in)
1925
31.8 mm (1.3 in)
1926
35.6 mm (1.4 in)
1927
62.5 mm (2.5 in)
1928
60.5 mm (2.4 in)
1929
115.6 mm (4.6 in)
1930
48.3 mm (1.9 in)
1931
65.8 mm (2.6 in)
1932
57.2 mm (2.3 in)
1933
46.5 mm (1.8 in)
1934
40.4 mm (1.6 in)
1935
21.8 mm (0.9 in)
1936
41.4 mm (1.6 in)
1937
29.2 mm (1.1 in)
1938
41.9 mm (1.6 in)
1939
24.9 mm (1.0 in)
1940
26.7 mm (1.1 in)
1941
40.6 mm (1.6 in)
1942
26.7 mm (1.1 in)
1943
54.6 mm (2.1 in)
1944
23.4 mm (0.9 in)
1945
39.1 mm (1.5 in)
1946
33.0 mm (1.3 in)
1947
47.0 mm (1.9 in)
1948
37.3 mm (1.5 in)
1949
48.8 mm (1.9 in)
1950
41.1 mm (1.6 in)
1951
30.5 mm (1.2 in)
1952
19.3 mm (0.8 in)
1953
44.5 mm (1.8 in)
1954
34.0 mm (1.3 in)
1955
54.6 mm (2.1 in)
1956
36.6 mm (1.4 in)
1957
34.5 mm (1.4 in)
1958
66.3 mm (2.6 in)
1959
26.9 mm (1.1 in)
1960
24.4 mm (1.0 in)
1961
32.5 mm (1.3 in)
1962
24.9 mm (1.0 in)
1963
53.1 mm (2.1 in)
1964
46.7 mm (1.8 in)
1965
35.1 mm (1.4 in)
1966
23.9 mm (0.9 in)
1967
29.5 mm (1.2 in)
1968
33.8 mm (1.3 in)
1969
50.0 mm (2.0 in)
1970
39.9 mm (1.6 in)
1971
48.8 mm (1.9 in)
1972
41.7 mm (1.6 in)
1973
21.3 mm (0.8 in)
1974
33.5 mm (1.3 in)
1975
42.9 mm (1.7 in)
1976
33.3 mm (1.3 in)
1977
36.1 mm (1.4 in)
1978
34.3 mm (1.4 in)
1979
35.8 mm (1.4 in)
1980
43.7 mm (1.7 in)
1981
37.3 mm (1.5 in)
1982
45.0 mm (1.8 in)
1983
31.8 mm (1.3 in)
1984
25.9 mm (1.0 in)
1985
29.0 mm (1.1 in)
1986
44.5 mm (1.8 in)
1987
23.4 mm (0.9 in)
1988
29.2 mm (1.1 in)
1989
34.5 mm (1.4 in)
1990
35.6 mm (1.4 in)
1991
30.5 mm (1.2 in)
1992
23.4 mm (0.9 in)
1993
28.4 mm (1.1 in)
1994
17.8 mm (0.7 in)
1995
28.2 mm (1.1 in)
1996
49.8 mm (2.0 in)
1997
29.5 mm (1.2 in)
1998
29.5 mm (1.2 in)
1999
28.7 mm (1.1 in)
2000
32.8 mm (1.3 in)
2001
39.4 mm (1.6 in)
2002
27.9 mm (1.1 in)
2003
28.7 mm (1.1 in)
2004
33.0 mm (1.3 in)
2005
36.1 mm (1.4 in)
2006
32.3 mm (1.3 in)
2007
24.1 mm (0.9 in)
2008
29.5 mm (1.2 in)
2009
33.3 mm (1.3 in)
2010
37.6 mm (1.5 in)
2011
24.1 mm (0.9 in)
2012
53.8 mm (2.1 in)
2013
5.3 mm (0.21 in)
Wettest five days (Rx5day)
The wettest five days of the year at Idaho City, 1894 to 2013. The record is 174.4 mm (6.9 in) in 1955, marked on the chart; the median year is 64.1 mm (2.5 in).
Wettest five days (Rx5day) at Idaho City by year
Year
Wettest five days (Rx5day)
1894
82.1 mm (3.2 in)
1895
41.9 mm (1.6 in)
1896
67.0 mm (2.6 in)
1897
65.6 mm (2.6 in)
1898
29.7 mm (1.2 in)
1899
106.4 mm (4.2 in)
1900
71.1 mm (2.8 in)
1901
51.8 mm (2.0 in)
1902
50.8 mm (2.0 in)
1903
18.5 mm (0.7 in)
1904
38.2 mm (1.5 in)
1905
40.3 mm (1.6 in)
1909
132.1 mm (5.2 in)
1910
46.2 mm (1.8 in)
1911
49.5 mm (1.9 in)
1912
53.8 mm (2.1 in)
1913
49.8 mm (2.0 in)
1914
47.2 mm (1.9 in)
1915
60.7 mm (2.4 in)
1916
115.8 mm (4.6 in)
1917
72.5 mm (2.9 in)
1918
37.1 mm (1.5 in)
1919
43.1 mm (1.7 in)
1920
51.7 mm (2.0 in)
1921
144.0 mm (5.7 in)
1922
50.3 mm (2.0 in)
1923
68.3 mm (2.7 in)
1924
71.3 mm (2.8 in)
1925
77.6 mm (3.1 in)
1926
100.4 mm (4.0 in)
1927
97.6 mm (3.8 in)
1928
74.5 mm (2.9 in)
1929
130.8 mm (5.1 in)
1930
55.4 mm (2.2 in)
1931
83.1 mm (3.3 in)
1932
83.1 mm (3.3 in)
1933
69.9 mm (2.8 in)
1934
47.5 mm (1.9 in)
1935
29.4 mm (1.2 in)
1936
58.2 mm (2.3 in)
1937
53.9 mm (2.1 in)
1938
67.3 mm (2.6 in)
1939
38.1 mm (1.5 in)
1940
52.9 mm (2.1 in)
1941
68.9 mm (2.7 in)
1942
59.4 mm (2.3 in)
1943
54.6 mm (2.1 in)
1944
59.4 mm (2.3 in)
1945
60.4 mm (2.4 in)
1946
74.3 mm (2.9 in)
1947
48.0 mm (1.9 in)
1948
67.8 mm (2.7 in)
1949
78.5 mm (3.1 in)
1950
63.4 mm (2.5 in)
1951
71.1 mm (2.8 in)
1952
42.5 mm (1.7 in)
1953
91.5 mm (3.6 in)
1954
59.6 mm (2.3 in)
1955
174.4 mm (6.9 in)
1956
59.4 mm (2.3 in)
1957
77.1 mm (3.0 in)
1958
80.3 mm (3.2 in)
1959
47.5 mm (1.9 in)
1960
67.6 mm (2.7 in)
1961
64.5 mm (2.5 in)
1962
62.5 mm (2.5 in)
1963
117.8 mm (4.6 in)
1964
127.4 mm (5.0 in)
1965
100.0 mm (3.9 in)
1966
75.9 mm (3.0 in)
1967
72.4 mm (2.9 in)
1968
93.3 mm (3.7 in)
1969
117.8 mm (4.6 in)
1970
87.2 mm (3.4 in)
1971
82.1 mm (3.2 in)
1972
100.6 mm (4.0 in)
1973
53.1 mm (2.1 in)
1974
52.6 mm (2.1 in)
1975
60.4 mm (2.4 in)
1976
58.9 mm (2.3 in)
1977
88.4 mm (3.5 in)
1978
55.1 mm (2.2 in)
1979
84.1 mm (3.3 in)
1980
96.5 mm (3.8 in)
1981
74.2 mm (2.9 in)
1982
99.8 mm (3.9 in)
1983
65.0 mm (2.6 in)
1984
56.7 mm (2.2 in)
1985
65.1 mm (2.6 in)
1986
98.0 mm (3.9 in)
1987
36.9 mm (1.5 in)
1988
53.3 mm (2.1 in)
1989
62.5 mm (2.5 in)
1990
61.9 mm (2.4 in)
1991
68.4 mm (2.7 in)
1992
54.4 mm (2.1 in)
1993
58.0 mm (2.3 in)
1994
37.6 mm (1.5 in)
1995
53.3 mm (2.1 in)
1996
124.2 mm (4.9 in)
1997
108.5 mm (4.3 in)
1998
65.7 mm (2.6 in)
1999
52.8 mm (2.1 in)
2000
59.5 mm (2.3 in)
2001
56.6 mm (2.2 in)
2002
55.6 mm (2.2 in)
2003
51.4 mm (2.0 in)
2004
71.0 mm (2.8 in)
2005
67.4 mm (2.7 in)
2006
64.1 mm (2.5 in)
2007
48.5 mm (1.9 in)
2008
69.3 mm (2.7 in)
2009
50.7 mm (2.0 in)
2010
57.5 mm (2.3 in)
2011
64.8 mm (2.6 in)
2012
124.1 mm (4.9 in)
2013
0.5 mm (0.02 in)
Longest dry spell (CDD)
The longest dry spell of the year at Idaho City, 1894 to 2013. The record is 136 days in 1905, marked on the chart; the median year is 42 days.
Longest dry spell (CDD) at Idaho City by year
Year
Longest dry spell (CDD)
1894
36 days
1895
42 days
1896
35 days
1897
67 days
1898
79 days
1899
59 days
1900
79 days
1901
53 days
1902
58 days
1903
24 days
1904
42 days
1905
136 days
1909
28 days
1910
19 days
1911
19 days
1912
17 days
1913
17 days
1914
58 days
1915
31 days
1916
31 days
1917
65 days
1918
27 days
1919
31 days
1920
39 days
1921
30 days
1922
42 days
1923
34 days
1924
72 days
1925
34 days
1926
67 days
1927
46 days
1928
114 days
1929
29 days
1930
65 days
1931
83 days
1932
40 days
1933
106 days
1934
55 days
1935
97 days
1936
91 days
1937
40 days
1938
27 days
1939
45 days
1940
39 days
1941
28 days
1942
95 days
1943
48 days
1944
74 days
1945
53 days
1946
32 days
1947
65 days
1948
53 days
1949
66 days
1950
32 days
1951
33 days
1952
108 days
1953
51 days
1954
34 days
1955
51 days
1956
65 days
1957
76 days
1958
40 days
1959
55 days
1960
65 days
1961
38 days
1962
37 days
1963
40 days
1964
29 days
1965
33 days
1966
81 days
1967
80 days
1968
50 days
1969
75 days
1970
26 days
1971
49 days
1972
50 days
1973
34 days
1974
49 days
1975
43 days
1976
35 days
1977
48 days
1978
53 days
1979
33 days
1980
30 days
1981
44 days
1982
32 days
1983
37 days
1984
30 days
1985
33 days
1986
32 days
1987
78 days
1988
85 days
1989
45 days
1990
39 days
1991
45 days
1992
43 days
1993
36 days
1994
41 days
1995
31 days
1996
28 days
1997
24 days
1998
35 days
1999
111 days
2000
43 days
2001
36 days
2002
43 days
2003
34 days
2004
29 days
2005
40 days
2006
76 days
2007
81 days
2008
57 days
2009
29 days
2010
35 days
2011
27 days
2012
70 days
2013
12 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
85 years with a frost
Across 85 years with a frost, the median last spring frost at Idaho City falls on 20 June and the median first autumn frost on 24 August, which leaves a median of 63 days between them.
In 1977 to 2012 the median growing season was 75 days. That is 14 days more than in 1895 to 1950.
Fitted over all years, the growing season changes by +1.5 days per decade at this station.
Frost dates and growing season at Idaho City
Measure
Median, all years
Earliest period (1895 to 1950)
Recent period (1977 to 2012)
Recent against earliest
Fitted trend
Last spring frost
20 June
22 June
19 June
3 days earlier
-0.1 days per decade
First autumn frost
24 August
17 August
2 September
16 days later
+1.4 days per decade
Growing days
63 days
61 days
75 days
14 days more
+1.5 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
88 years, 1895 to 2010
A day with at least 34.7 mm (1.4 in) of rain is expected about once in 2 years. A day with at least 70.4 mm (2.8 in) of rain is expected about once in 100 years.
Rainfall return levels at Idaho City: the daily rain expected about once in a given number of years
Expected about once in
A day with at least
Note
2 years
34.7 mm (1.4 in)
5 years
44.3 mm (1.7 in)
10 years
50.7 mm (2.0 in)
25 years
58.7 mm (2.3 in)
50 years
64.6 mm (2.5 in)
100 years
70.4 mm (2.8 in)
Longer than the 88 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, 88 years of values from 1895 to 2010.
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: 66.3 mm (2.6 in) in 1958; 65.8 mm (2.6 in) in 1931; 62.5 mm (2.5 in) in 1927.
Station Changes
1 suspected
One change was suspected in the annual mean temperature of Idaho City, at 1928. Each is measured against neighbouring stations.
Relative to 5 neighbouring stations, the station's annual mean temperature from 1928 ran 0.6 C (1.1 F) lower than in the years before (likely change).
Suspected changes in the annual mean temperature at Idaho City, against neighbouring stations
Year
Shift (C)
Shift (F)
Strength
Neighbours
1928
-0.6
-1.1
likely
5
Possible change at the station (a move, a new instrument or a new site); the record is kept as measured. A "likely" change has a larger test statistic than a "possible" one. Neither says why the station differs from its neighbours. How changes are found, and the largest ones.
Download the Data
Data for Idaho City standing records by year: CSV or JSON. Field meanings are on the data page.
Data for Idaho City 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 2026-10-13 (13 October 2026). Records are computed by this site and are not official.