Record envelope, standing records and threshold days for American Falls 6 NE (USC00100227), Idaho, United States, with 117 years of record.
Key Facts for American Falls 6 NE
American Falls 6 NE (USC00100227) is a weather station in Idaho, United States at 42.86 latitude and -112.88 longitude, 1,346 m (4,415 ft) above sea level.
The station reports from 1892 to 2008, 117 years of record.
1,464 records set at American Falls 6 NE still stand.
Records are tracked for tmax, tmin, prcp, snow, snwd: an element needs 30 years of data to be eligible.
American Falls 6 NE set a daily record precipitation of 21.6 mm (0.9 in) on 2 November 2008.
About the Station
Location: Idaho, United States, 42.86 latitude, -112.88 longitude.
Elevation: 1,346 m (4,415 ft).
Period of record: 1892 to 2008, 117 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 American Falls 6 NE. 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 American Falls 6 NE, with 2026 drawn through them
Month
Highest record high
Lowest record low
2026 highest maximum
2026 lowest minimum
Jan
15.0 C (59.0 F)
-38.9 C (-38.0 F)
n/a
n/a
Feb
20.6 C (69.1 F)
-34.4 C (-29.9 F)
n/a
n/a
Mar
25.6 C (78.1 F)
-25.6 C (-14.1 F)
n/a
n/a
Apr
30.6 C (87.1 F)
-14.4 C (6.1 F)
n/a
n/a
May
37.2 C (99.0 F)
-10.6 C (12.9 F)
n/a
n/a
Jun
39.4 C (102.9 F)
-7.2 C (19.0 F)
n/a
n/a
Jul
41.1 C (106.0 F)
-5.0 C (23.0 F)
n/a
n/a
Aug
41.1 C (106.0 F)
-3.3 C (26.1 F)
n/a
n/a
Sep
37.8 C (100.0 F)
-8.9 C (16.0 F)
n/a
n/a
Oct
30.6 C (87.1 F)
-14.4 C (6.1 F)
n/a
n/a
Nov
29.4 C (84.9 F)
-30.6 C (-23.1 F)
n/a
n/a
Dec
16.7 C (62.1 F)
-32.2 C (-26.0 F)
n/a
n/a
Which Years Hold Standing Records
1,464 standing records
Year with most
1,464 records at American Falls 6 NE still stand. 1911 holds the most, with 52.
Standing records at American Falls 6 NE by the year they were set
Year set
Standing records
1893
27
1894
17
1895
18
1896
23
1897
20
1898
15
1899
40
1900
25
1901
30
1902
21
1903
22
1904
22
1905
26
1906
26
1907
25
1908
27
1909
5
1910
5
1911
52
1912
22
1913
14
1914
9
1915
14
1916
18
1917
34
1918
25
1919
44
1920
13
1921
8
1922
12
1923
8
1924
17
1925
13
1926
2
1933
8
1934
22
1935
4
1936
17
1937
18
1938
5
1939
15
1940
7
1941
12
1942
15
1943
6
1944
5
1945
10
1946
6
1947
16
1948
7
1949
18
1950
20
1951
8
1952
4
1953
11
1954
11
1955
15
1956
4
1957
5
1958
12
1959
11
1960
7
1961
7
1962
8
1963
12
1964
14
1965
11
1966
6
1967
5
1968
13
1969
15
1970
8
1971
9
1972
15
1973
4
1974
12
1975
12
1976
2
1977
11
1978
6
1979
9
1980
10
1981
14
1982
8
1983
9
1984
10
1985
18
1986
14
1987
12
1988
15
1989
11
1990
17
1991
12
1992
17
1993
12
1994
7
1995
12
1996
13
1997
5
1998
5
1999
7
2000
6
2001
5
2002
10
2003
13
2004
7
2005
5
2006
4
2007
6
2008
3
All-Time Record Progression
5 new records
5 all-time records were set at American Falls 6 NE between 21 January 1937 and 16 May 1987. Each dot is a new record.
When American Falls 6 NE set new all-time records
Date
Kind
Detail
1937-01-21
Record low maximum temperature
Record low maximum temperature -22.2 C (-8.0 F)
1937-01-21
Record low minimum temperature
Record low minimum temperature -36.1 C (-33.0 F)
1949-01-25
Record low minimum temperature
Record low minimum temperature -38.9 C (-38.0 F)
1949-05-16
Record daily precipitation
Record daily precipitation 49.0 mm (1.9 in)
1987-05-16
Record daily precipitation
Record daily precipitation 52.3 mm (2.1 in)
Wettest Day of Each Month
May: 52.3 mm (2.1 in)
The wettest day on record for each calendar month at American Falls 6 NE. The most was 52.3 mm (2.1 in) on 16 May 1987.
Record daily precipitation for each month at American Falls 6 NE
Month
Record daily precipitation (mm)
Date
Jan
32.3 mm (1.3 in)
6 January 1909
Feb
25.4 mm (1.0 in)
6 February 1925
Mar
43.2 mm (1.7 in)
23 March 1916
Apr
46.7 mm (1.8 in)
21 April 1900
May
52.3 mm (2.1 in)
16 May 1987
Jun
45.7 mm (1.8 in)
20 June 1918
Jul
45.7 mm (1.8 in)
12 July 1898
Aug
33.5 mm (1.3 in)
3 August 1936
Sep
30.0 mm (1.2 in)
7 September 1906
Oct
30.7 mm (1.2 in)
24 October 1974
Nov
27.9 mm (1.1 in)
14 November 1971
Dec
34.0 mm (1.3 in)
23 December 1964
Period of Record Coverage
1892 to 2008
Complete yearUnder 90 percent of days
111 years of record at American Falls 6 NE, 1892 to 2008. 27 years have data for under 90 percent of days and are left out of rankings: 1892, 1893, 1897, 1900, 1909, 1910, 1913, 1914 and others.
Cooler than the station meanWarmer than the station mean
One stripe for each of 78 complete years at American Falls 6 NE, 1894 to 2006. Blue stripes are years cooler than the station's own mean of 8.4 C (47.1 F); red stripes are warmer. The coolest year was 1985, at 6.5 C (43.6 F), and the warmest was 1981, at 10.4 C (50.7 F). The strongest colour marks a difference of 2.0 C (3.6 F).
Annual mean temperature at American Falls 6 NE as warming stripes, 1894 to 2006
Year
Annual mean temperature
Difference from the station mean
1894
7.7 C
-0.66 C
1895
7.3 C
-1.09 C
1899
8.5 C
+0.14 C
1901
8.6 C
+0.23 C
1903
7.1 C
-1.32 C
1904
8.2 C
-0.16 C
1906
8.0 C
-0.43 C
1907
8.0 C
-0.43 C
1908
7.5 C
-0.87 C
1918
8.1 C
-0.31 C
1919
6.9 C
-1.51 C
1920
7.6 C
-0.82 C
1923
7.9 C
-0.45 C
1924
8.1 C
-0.34 C
1936
8.6 C
+0.22 C
1937
7.8 C
-0.58 C
1938
8.9 C
+0.47 C
1939
8.9 C
+0.51 C
1940
9.4 C
+0.96 C
1941
8.1 C
-0.33 C
1942
7.3 C
-1.11 C
1943
8.9 C
+0.53 C
1944
7.0 C
-1.36 C
1945
8.2 C
-0.24 C
1946
8.7 C
+0.34 C
1947
8.9 C
+0.51 C
1948
8.0 C
-0.35 C
1949
7.7 C
-0.74 C
1950
8.0 C
-0.35 C
1951
7.9 C
-0.54 C
1952
7.4 C
-0.98 C
1953
9.1 C
+0.75 C
1955
7.5 C
-0.86 C
1956
8.3 C
-0.09 C
1957
8.5 C
+0.06 C
1958
9.6 C
+1.21 C
1959
8.9 C
+0.51 C
1960
8.3 C
-0.12 C
1961
9.2 C
+0.79 C
1962
8.3 C
-0.10 C
1963
8.9 C
+0.49 C
1964
7.3 C
-1.11 C
1965
8.7 C
+0.34 C
1966
9.0 C
+0.56 C
1967
9.3 C
+0.86 C
1968
8.2 C
-0.21 C
1969
8.6 C
+0.17 C
1970
8.4 C
+0.04 C
1971
8.1 C
-0.32 C
1972
8.3 C
-0.13 C
1974
8.6 C
+0.24 C
1975
8.0 C
-0.41 C
1976
8.0 C
-0.44 C
1977
8.4 C
-0.01 C
1979
9.3 C
+0.89 C
1980
9.6 C
+1.17 C
1981
10.4 C
+1.99 C
1982
8.4 C
+0.02 C
1983
9.5 C
+1.09 C
1984
7.5 C
-0.85 C
1985
6.5 C
-1.94 C
1986
9.5 C
+1.08 C
1987
9.6 C
+1.25 C
1988
9.8 C
+1.41 C
1989
8.8 C
+0.45 C
1990
9.5 C
+1.06 C
1991
9.1 C
+0.75 C
1992
10.0 C
+1.63 C
1993
7.1 C
-1.34 C
1996
8.8 C
+0.37 C
1997
8.0 C
-0.35 C
1998
9.0 C
+0.62 C
1999
8.6 C
+0.24 C
2002
7.5 C
-0.85 C
2003
9.7 C
+1.30 C
2004
8.1 C
-0.33 C
2005
7.8 C
-0.63 C
2006
8.3 C
-0.08 C
The annual mean temperature here has risen by 0.09 C (0.04 to 0.15) per decade over 1894 to 2006. In Fahrenheit: 0.2 F (0.1 to 0.3) per decade. The slope is a straight line fitted to 78 complete years; the brackets give its 95 percent interval.
Fitted temperature trends per decade at American Falls 6 NE
Measure
Per decade (C)
Per decade (F)
Period
Complete years
Reading
Annual mean temperature
0.09 C (0.04 to 0.15) per decade
0.2 F (0.1 to 0.3) per decade
1894 to 2006
78
Rise
Mean daily maximum
-0.04 C (-0.10 to 0.03) per decade
-0.07 F (-0.19 to 0.05) per decade
1894 to 2006
78
Not clearly different from zero
Mean daily minimum
0.2 C (0.2 to 0.3) per decade
0.4 F (0.3 to 0.5) per decade
1894 to 2006
78
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
1892 to 2008
Yearly extremes at American Falls 6 NE: the record and the median year
Measure
Record
Year of the record
Median year
Years with a value
Hottest day (TXx)
41.1 C (106.0 F)
1893
36.7 C (98.1 F)
111
Coldest night (TNn)
-38.9 C (-38.0 F)
1949
-23.9 C (-11.0 F)
111
Wettest day (Rx1day)
52.3 mm (2.1 in)
1987
24.9 mm (1.0 in)
111
Wettest five days (Rx5day)
81.2 mm (3.2 in)
1949
37.7 mm (1.5 in)
111
Longest dry spell (CDD)
113 days
1917
40 days
111
Hottest day (TXx)
The hottest day of the year at American Falls 6 NE, 1892 to 2008. The record is 41.1 C (106.0 F) in 1893, marked on the chart; the median year is 36.7 C (98.1 F).
Hottest day (TXx) at American Falls 6 NE by year
Year
Hottest day (TXx)
1892
8.3 C (46.9 F)
1893
41.1 C (106.0 F)
1894
37.8 C (100.0 F)
1895
37.2 C (99.0 F)
1896
38.9 C (102.0 F)
1897
39.4 C (102.9 F)
1898
38.9 C (102.0 F)
1899
39.4 C (102.9 F)
1900
40.0 C (104.0 F)
1901
39.4 C (102.9 F)
1902
36.7 C (98.1 F)
1903
37.2 C (99.0 F)
1904
37.2 C (99.0 F)
1905
37.2 C (99.0 F)
1906
37.8 C (100.0 F)
1907
35.0 C (95.0 F)
1908
37.2 C (99.0 F)
1909
29.4 C (84.9 F)
1910
37.2 C (99.0 F)
1911
35.6 C (96.1 F)
1912
37.2 C (99.0 F)
1913
36.7 C (98.1 F)
1914
36.7 C (98.1 F)
1915
39.4 C (102.9 F)
1916
37.8 C (100.0 F)
1917
38.9 C (102.0 F)
1918
39.4 C (102.9 F)
1919
40.0 C (104.0 F)
1920
37.8 C (100.0 F)
1921
37.8 C (100.0 F)
1922
38.3 C (100.9 F)
1923
38.3 C (100.9 F)
1924
39.4 C (102.9 F)
1925
41.1 C (106.0 F)
1926
14.4 C (57.9 F)
1933
34.4 C (93.9 F)
1934
26.7 C (80.1 F)
1935
37.8 C (100.0 F)
1936
36.1 C (97.0 F)
1937
36.7 C (98.1 F)
1938
35.0 C (95.0 F)
1939
37.8 C (100.0 F)
1940
37.8 C (100.0 F)
1941
34.4 C (93.9 F)
1942
36.7 C (98.1 F)
1943
36.7 C (98.1 F)
1944
35.0 C (95.0 F)
1945
36.1 C (97.0 F)
1946
37.8 C (100.0 F)
1947
36.1 C (97.0 F)
1948
35.6 C (96.1 F)
1949
36.7 C (98.1 F)
1950
34.4 C (93.9 F)
1951
37.2 C (99.0 F)
1952
33.9 C (93.0 F)
1953
35.0 C (95.0 F)
1954
37.2 C (99.0 F)
1955
35.6 C (96.1 F)
1956
37.8 C (100.0 F)
1957
35.0 C (95.0 F)
1958
35.0 C (95.0 F)
1959
35.6 C (96.1 F)
1960
37.2 C (99.0 F)
1961
36.1 C (97.0 F)
1962
34.4 C (93.9 F)
1963
36.1 C (97.0 F)
1964
35.0 C (95.0 F)
1965
33.9 C (93.0 F)
1966
35.6 C (96.1 F)
1967
35.6 C (96.1 F)
1968
35.6 C (96.1 F)
1969
36.1 C (97.0 F)
1970
35.6 C (96.1 F)
1971
35.0 C (95.0 F)
1972
35.0 C (95.0 F)
1973
35.0 C (95.0 F)
1974
38.3 C (100.9 F)
1975
38.9 C (102.0 F)
1976
37.8 C (100.0 F)
1977
36.7 C (98.1 F)
1978
36.7 C (98.1 F)
1979
38.3 C (100.9 F)
1980
35.6 C (96.1 F)
1981
37.8 C (100.0 F)
1982
36.1 C (97.0 F)
1983
35.0 C (95.0 F)
1984
35.6 C (96.1 F)
1985
37.2 C (99.0 F)
1986
37.2 C (99.0 F)
1987
37.2 C (99.0 F)
1988
39.4 C (102.9 F)
1989
38.3 C (100.9 F)
1990
38.9 C (102.0 F)
1991
36.1 C (97.0 F)
1992
38.9 C (102.0 F)
1993
33.9 C (93.0 F)
1994
39.4 C (102.9 F)
1995
35.0 C (95.0 F)
1996
36.1 C (97.0 F)
1997
34.4 C (93.9 F)
1998
35.6 C (96.1 F)
1999
35.6 C (96.1 F)
2000
36.7 C (98.1 F)
2001
35.0 C (95.0 F)
2002
35.0 C (95.0 F)
2003
36.1 C (97.0 F)
2004
35.0 C (95.0 F)
2005
34.4 C (93.9 F)
2006
35.6 C (96.1 F)
2007
34.4 C (93.9 F)
2008
35.6 C (96.1 F)
Coldest night (TNn)
The coldest night of the year at American Falls 6 NE, 1892 to 2008. The record is -38.9 C (-38.0 F) in 1949, marked on the chart; the median year is -23.9 C (-11.0 F).
Coldest night (TNn) at American Falls 6 NE by year
Year
Coldest night (TNn)
1892
-27.2 C (-17.0 F)
1893
-32.2 C (-26.0 F)
1894
-29.4 C (-20.9 F)
1895
-30.0 C (-22.0 F)
1896
-30.6 C (-23.1 F)
1897
-22.8 C (-9.0 F)
1898
-31.7 C (-25.1 F)
1899
-29.4 C (-20.9 F)
1900
-28.3 C (-18.9 F)
1901
-21.1 C (-6.0 F)
1902
-32.8 C (-27.0 F)
1903
-28.9 C (-20.0 F)
1904
-28.9 C (-20.0 F)
1905
-33.3 C (-27.9 F)
1906
-20.6 C (-5.1 F)
1907
-24.4 C (-11.9 F)
1908
-30.6 C (-23.1 F)
1909
-22.2 C (-8.0 F)
1910
-11.7 C (10.9 F)
1911
-17.8 C (0.0 F)
1912
-19.4 C (-2.9 F)
1913
-26.7 C (-16.1 F)
1914
-21.7 C (-7.1 F)
1915
-29.4 C (-20.9 F)
1916
-24.4 C (-11.9 F)
1917
-29.4 C (-20.9 F)
1918
-25.6 C (-14.1 F)
1919
-29.4 C (-20.9 F)
1920
-23.3 C (-9.9 F)
1921
-18.9 C (-2.0 F)
1922
-31.7 C (-25.1 F)
1923
-26.1 C (-15.0 F)
1924
-32.2 C (-26.0 F)
1925
-20.0 C (-4.0 F)
1926
-15.0 C (5.0 F)
1933
-12.2 C (10.0 F)
1934
-8.9 C (16.0 F)
1935
-17.2 C (1.0 F)
1936
-26.1 C (-15.0 F)
1937
-36.1 C (-33.0 F)
1938
-16.7 C (1.9 F)
1939
-18.9 C (-2.0 F)
1940
-19.4 C (-2.9 F)
1941
-20.6 C (-5.1 F)
1942
-30.0 C (-22.0 F)
1943
-20.6 C (-5.1 F)
1944
-23.9 C (-11.0 F)
1945
-23.3 C (-9.9 F)
1946
-20.0 C (-4.0 F)
1947
-25.6 C (-14.1 F)
1948
-22.2 C (-8.0 F)
1949
-38.9 C (-38.0 F)
1950
-28.3 C (-18.9 F)
1951
-25.0 C (-13.0 F)
1952
-24.4 C (-11.9 F)
1953
-15.0 C (5.0 F)
1954
-23.3 C (-9.9 F)
1955
-23.9 C (-11.0 F)
1956
-28.9 C (-20.0 F)
1957
-26.7 C (-16.1 F)
1958
-18.3 C (-0.9 F)
1959
-23.9 C (-11.0 F)
1960
-29.4 C (-20.9 F)
1961
-18.9 C (-2.0 F)
1962
-35.0 C (-31.0 F)
1963
-31.1 C (-24.0 F)
1964
-26.1 C (-15.0 F)
1965
-18.9 C (-2.0 F)
1966
-18.9 C (-2.0 F)
1967
-18.3 C (-0.9 F)
1968
-20.6 C (-5.1 F)
1969
-19.4 C (-2.9 F)
1970
-20.6 C (-5.1 F)
1971
-20.0 C (-4.0 F)
1972
-29.4 C (-20.9 F)
1973
-26.7 C (-16.1 F)
1974
-27.2 C (-17.0 F)
1975
-24.4 C (-11.9 F)
1976
-24.4 C (-11.9 F)
1977
-23.3 C (-9.9 F)
1978
-22.8 C (-9.0 F)
1979
-32.8 C (-27.0 F)
1980
-21.7 C (-7.1 F)
1981
-18.3 C (-0.9 F)
1982
-26.1 C (-15.0 F)
1983
-28.9 C (-20.0 F)
1984
-33.3 C (-27.9 F)
1985
-34.4 C (-29.9 F)
1986
-18.9 C (-2.0 F)
1987
-22.8 C (-9.0 F)
1988
-21.7 C (-7.1 F)
1989
-25.0 C (-13.0 F)
1990
-30.6 C (-23.1 F)
1991
-20.0 C (-4.0 F)
1992
-28.9 C (-20.0 F)
1993
-26.1 C (-15.0 F)
1994
-17.8 C (0.0 F)
1995
-16.1 C (3.0 F)
1996
-25.6 C (-14.1 F)
1997
-17.8 C (0.0 F)
1998
-26.1 C (-15.0 F)
1999
-18.3 C (-0.9 F)
2000
-13.9 C (7.0 F)
2001
-22.8 C (-9.0 F)
2002
-22.8 C (-9.0 F)
2003
-16.7 C (1.9 F)
2004
-25.0 C (-13.0 F)
2005
-26.7 C (-16.1 F)
2006
-22.2 C (-8.0 F)
2007
-20.6 C (-5.1 F)
2008
-22.8 C (-9.0 F)
Wettest day (Rx1day)
The wettest day of the year at American Falls 6 NE, 1892 to 2008. The record is 52.3 mm (2.1 in) in 1987, marked on the chart; the median year is 24.9 mm (1.0 in).
Wettest day (Rx1day) at American Falls 6 NE by year
Year
Wettest day (Rx1day)
1892
11.9 mm (0.5 in)
1893
19.3 mm (0.8 in)
1894
20.3 mm (0.8 in)
1895
22.9 mm (0.9 in)
1896
30.5 mm (1.2 in)
1897
19.1 mm (0.8 in)
1898
45.7 mm (1.8 in)
1899
17.8 mm (0.7 in)
1900
46.7 mm (1.8 in)
1901
26.4 mm (1.0 in)
1902
25.4 mm (1.0 in)
1903
25.4 mm (1.0 in)
1904
29.2 mm (1.1 in)
1905
17.8 mm (0.7 in)
1906
30.0 mm (1.2 in)
1907
31.8 mm (1.3 in)
1908
15.2 mm (0.6 in)
1909
32.3 mm (1.3 in)
1910
15.7 mm (0.6 in)
1911
30.5 mm (1.2 in)
1912
28.4 mm (1.1 in)
1913
35.6 mm (1.4 in)
1914
16.8 mm (0.7 in)
1915
25.4 mm (1.0 in)
1916
43.2 mm (1.7 in)
1917
30.5 mm (1.2 in)
1918
45.7 mm (1.8 in)
1919
26.2 mm (1.0 in)
1920
25.7 mm (1.0 in)
1921
23.1 mm (0.9 in)
1922
25.1 mm (1.0 in)
1923
38.1 mm (1.5 in)
1924
25.4 mm (1.0 in)
1925
25.4 mm (1.0 in)
1926
10.2 mm (0.4 in)
1933
12.2 mm (0.5 in)
1934
21.6 mm (0.9 in)
1935
18.8 mm (0.7 in)
1936
33.5 mm (1.3 in)
1937
30.7 mm (1.2 in)
1938
26.7 mm (1.1 in)
1939
18.8 mm (0.7 in)
1940
31.2 mm (1.2 in)
1941
21.8 mm (0.9 in)
1942
25.7 mm (1.0 in)
1943
23.9 mm (0.9 in)
1944
26.4 mm (1.0 in)
1945
10.9 mm (0.4 in)
1946
39.9 mm (1.6 in)
1947
35.6 mm (1.4 in)
1948
22.4 mm (0.9 in)
1949
49.0 mm (1.9 in)
1950
20.6 mm (0.8 in)
1951
17.0 mm (0.7 in)
1952
13.0 mm (0.5 in)
1953
25.7 mm (1.0 in)
1954
12.4 mm (0.5 in)
1955
15.5 mm (0.6 in)
1956
19.3 mm (0.8 in)
1957
20.3 mm (0.8 in)
1958
22.1 mm (0.9 in)
1959
17.8 mm (0.7 in)
1960
13.5 mm (0.5 in)
1961
30.0 mm (1.2 in)
1962
18.0 mm (0.7 in)
1963
22.9 mm (0.9 in)
1964
34.0 mm (1.3 in)
1965
23.1 mm (0.9 in)
1966
15.2 mm (0.6 in)
1967
24.9 mm (1.0 in)
1968
31.5 mm (1.2 in)
1969
24.9 mm (1.0 in)
1970
28.4 mm (1.1 in)
1971
27.9 mm (1.1 in)
1972
24.6 mm (1.0 in)
1973
20.6 mm (0.8 in)
1974
30.7 mm (1.2 in)
1975
27.2 mm (1.1 in)
1976
16.3 mm (0.6 in)
1977
19.8 mm (0.8 in)
1978
14.7 mm (0.6 in)
1979
13.7 mm (0.5 in)
1980
29.0 mm (1.1 in)
1981
21.8 mm (0.9 in)
1982
29.5 mm (1.2 in)
1983
27.7 mm (1.1 in)
1984
23.1 mm (0.9 in)
1985
29.0 mm (1.1 in)
1986
25.4 mm (1.0 in)
1987
52.3 mm (2.1 in)
1988
21.6 mm (0.9 in)
1989
27.4 mm (1.1 in)
1990
30.0 mm (1.2 in)
1991
25.4 mm (1.0 in)
1992
15.7 mm (0.6 in)
1993
27.9 mm (1.1 in)
1994
26.7 mm (1.1 in)
1995
35.6 mm (1.4 in)
1996
27.9 mm (1.1 in)
1997
26.2 mm (1.0 in)
1998
14.5 mm (0.6 in)
1999
16.5 mm (0.6 in)
2000
12.7 mm (0.5 in)
2001
16.0 mm (0.6 in)
2002
16.3 mm (0.6 in)
2003
13.5 mm (0.5 in)
2004
13.0 mm (0.5 in)
2005
20.6 mm (0.8 in)
2006
15.0 mm (0.6 in)
2007
16.3 mm (0.6 in)
2008
21.6 mm (0.9 in)
Wettest five days (Rx5day)
The wettest five days of the year at American Falls 6 NE, 1892 to 2008. The record is 81.2 mm (3.2 in) in 1949, marked on the chart; the median year is 37.7 mm (1.5 in).
Wettest five days (Rx5day) at American Falls 6 NE by year
Year
Wettest five days (Rx5day)
1892
27.4 mm (1.1 in)
1893
46.2 mm (1.8 in)
1894
26.7 mm (1.1 in)
1895
28.5 mm (1.1 in)
1896
51.1 mm (2.0 in)
1897
30.2 mm (1.2 in)
1898
50.8 mm (2.0 in)
1899
31.3 mm (1.2 in)
1900
55.8 mm (2.2 in)
1901
47.0 mm (1.9 in)
1902
40.8 mm (1.6 in)
1903
38.9 mm (1.5 in)
1904
50.9 mm (2.0 in)
1905
43.4 mm (1.7 in)
1906
49.5 mm (1.9 in)
1907
66.0 mm (2.6 in)
1908
43.2 mm (1.7 in)
1909
41.4 mm (1.6 in)
1910
15.7 mm (0.6 in)
1911
57.2 mm (2.3 in)
1912
53.8 mm (2.1 in)
1913
51.9 mm (2.0 in)
1914
43.7 mm (1.7 in)
1915
35.6 mm (1.4 in)
1916
61.1 mm (2.4 in)
1917
42.9 mm (1.7 in)
1918
49.5 mm (1.9 in)
1919
37.4 mm (1.5 in)
1920
64.0 mm (2.5 in)
1921
39.4 mm (1.6 in)
1922
25.1 mm (1.0 in)
1923
51.6 mm (2.0 in)
1924
25.4 mm (1.0 in)
1925
49.0 mm (1.9 in)
1926
11.2 mm (0.4 in)
1933
14.3 mm (0.6 in)
1934
30.5 mm (1.2 in)
1935
20.9 mm (0.8 in)
1936
43.0 mm (1.7 in)
1937
37.1 mm (1.5 in)
1938
49.3 mm (1.9 in)
1939
28.7 mm (1.1 in)
1940
38.3 mm (1.5 in)
1941
46.9 mm (1.8 in)
1942
38.1 mm (1.5 in)
1943
30.3 mm (1.2 in)
1944
57.9 mm (2.3 in)
1945
21.3 mm (0.8 in)
1946
41.9 mm (1.6 in)
1947
38.9 mm (1.5 in)
1948
45.8 mm (1.8 in)
1949
81.2 mm (3.2 in)
1950
31.8 mm (1.3 in)
1951
25.7 mm (1.0 in)
1952
26.9 mm (1.1 in)
1953
27.0 mm (1.1 in)
1954
15.8 mm (0.6 in)
1955
24.6 mm (1.0 in)
1956
41.4 mm (1.6 in)
1957
50.1 mm (2.0 in)
1958
31.3 mm (1.2 in)
1959
22.3 mm (0.9 in)
1960
24.7 mm (1.0 in)
1961
40.4 mm (1.6 in)
1962
18.0 mm (0.7 in)
1963
49.3 mm (1.9 in)
1964
70.3 mm (2.8 in)
1965
34.0 mm (1.3 in)
1966
26.4 mm (1.0 in)
1967
29.7 mm (1.2 in)
1968
65.0 mm (2.6 in)
1969
30.3 mm (1.2 in)
1970
30.0 mm (1.2 in)
1971
53.1 mm (2.1 in)
1972
29.0 mm (1.1 in)
1973
22.6 mm (0.9 in)
1974
41.7 mm (1.6 in)
1975
44.2 mm (1.7 in)
1976
25.8 mm (1.0 in)
1977
26.4 mm (1.0 in)
1978
23.4 mm (0.9 in)
1979
21.8 mm (0.9 in)
1980
68.6 mm (2.7 in)
1981
29.2 mm (1.1 in)
1982
43.7 mm (1.7 in)
1983
48.0 mm (1.9 in)
1984
44.7 mm (1.8 in)
1985
45.3 mm (1.8 in)
1986
54.6 mm (2.1 in)
1987
80.6 mm (3.2 in)
1988
29.0 mm (1.1 in)
1989
31.8 mm (1.3 in)
1990
31.5 mm (1.2 in)
1991
49.5 mm (1.9 in)
1992
22.6 mm (0.9 in)
1993
57.8 mm (2.3 in)
1994
27.2 mm (1.1 in)
1995
56.7 mm (2.2 in)
1996
38.9 mm (1.5 in)
1997
31.2 mm (1.2 in)
1998
32.4 mm (1.3 in)
1999
37.7 mm (1.5 in)
2000
21.4 mm (0.8 in)
2001
24.6 mm (1.0 in)
2002
25.7 mm (1.0 in)
2003
25.9 mm (1.0 in)
2004
21.9 mm (0.9 in)
2005
33.9 mm (1.3 in)
2006
43.3 mm (1.7 in)
2007
18.8 mm (0.7 in)
2008
24.6 mm (1.0 in)
Longest dry spell (CDD)
The longest dry spell of the year at American Falls 6 NE, 1892 to 2008. The record is 113 days in 1917, marked on the chart; the median year is 40 days.
Longest dry spell (CDD) at American Falls 6 NE by year
Year
Longest dry spell (CDD)
1892
13 days
1893
36 days
1894
44 days
1895
46 days
1896
20 days
1897
32 days
1898
48 days
1899
56 days
1900
95 days
1901
54 days
1902
71 days
1903
33 days
1904
56 days
1905
51 days
1906
36 days
1907
25 days
1908
39 days
1909
24 days
1910
38 days
1911
72 days
1912
22 days
1913
22 days
1914
49 days
1915
42 days
1916
43 days
1917
113 days
1918
30 days
1919
60 days
1920
37 days
1921
80 days
1922
54 days
1923
52 days
1924
39 days
1925
19 days
1926
13 days
1933
44 days
1934
44 days
1935
75 days
1936
33 days
1937
30 days
1938
46 days
1939
51 days
1940
48 days
1941
20 days
1942
58 days
1943
39 days
1944
57 days
1945
25 days
1946
36 days
1947
40 days
1948
42 days
1949
38 days
1950
31 days
1951
45 days
1952
62 days
1953
36 days
1954
36 days
1955
29 days
1956
40 days
1957
32 days
1958
45 days
1959
52 days
1960
50 days
1961
33 days
1962
41 days
1963
39 days
1964
62 days
1965
44 days
1966
38 days
1967
23 days
1968
33 days
1969
39 days
1970
45 days
1971
27 days
1972
25 days
1973
28 days
1974
56 days
1975
23 days
1976
61 days
1977
38 days
1978
52 days
1979
35 days
1980
39 days
1981
68 days
1982
20 days
1983
25 days
1984
20 days
1985
23 days
1986
30 days
1987
50 days
1988
83 days
1989
29 days
1990
46 days
1991
70 days
1992
49 days
1993
33 days
1994
28 days
1995
47 days
1996
47 days
1997
29 days
1998
42 days
1999
58 days
2000
37 days
2001
51 days
2002
52 days
2003
53 days
2004
29 days
2005
46 days
2006
42 days
2007
39 days
2008
39 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
78 years with a frost
Across 78 years with a frost, the median last spring frost at American Falls 6 NE falls on 17 May and the median first autumn frost on 22 September, which leaves a median of 132 days between them.
In 1971 to 2006 the median growing season was 144 days. That is 25 days more than in 1894 to 1951.
Fitted over all years, the growing season changes by +6.2 days per decade at this station.
Frost dates and growing season at American Falls 6 NE
Measure
Median, all years
Earliest period (1894 to 1951)
Recent period (1971 to 2006)
Recent against earliest
Fitted trend
Last spring frost
17 May
22 May
9 May
13 days earlier
-2.3 days per decade
First autumn frost
22 September
18 September
29 September
11 days later
+3.9 days per decade
Growing days
132 days
119 days
144 days
25 days more
+6.2 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
89 years, 1895 to 2008
A day with at least 23.4 mm (0.9 in) of rain is expected about once in 2 years. A day with at least 48.6 mm (1.9 in) of rain is expected about once in 100 years.
Rainfall return levels at American Falls 6 NE: the daily rain expected about once in a given number of years
Expected about once in
A day with at least
Note
2 years
23.4 mm (0.9 in)
5 years
30.8 mm (1.2 in)
10 years
35.5 mm (1.4 in)
25 years
41.0 mm (1.6 in)
50 years
44.9 mm (1.8 in)
100 years
48.6 mm (1.9 in)
Longer than the 89 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, 89 years of values from 1895 to 2008.
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: 52.3 mm (2.1 in) in 1987; 49.0 mm (1.9 in) in 1949; 46.7 mm (1.8 in) in 1900.
Station Changes
No change in the annual mean temperature of this station was found against its neighbours.
Download the Data
Data for American Falls 6 NE standing records by year: CSV or JSON. Field meanings are on the data page.
Data for American Falls 6 NE 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.