Record envelope, standing records and threshold days for Tarkio (USW00014945), Missouri, United States, with 97 years of record.
Key Facts for Tarkio
Tarkio (USW00014945) is a weather station in Missouri, United States at 40.43 latitude and -95.39 longitude, 319 m (1,045 ft) above sea level.
The station reports from 1912 to 2008, 97 years of record.
1,464 records set at Tarkio still stand.
Records are tracked for tmax, tmin, prcp, snow, snwd: an element needs 30 years of data to be eligible.
Tarkio set a daily record low maximum temperature of 3.3 C (37.9 F) on 13 April 2008.
About the Station
Location: Missouri, United States, 40.43 latitude, -95.39 longitude.
Elevation: 319 m (1,045 ft).
Period of record: 1912 to 2008, 97 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 Tarkio. 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 Tarkio, with 2026 drawn through them
Month
Highest record high
Lowest record low
2026 highest maximum
2026 lowest minimum
Jan
20.0 C (68.0 F)
-33.3 C (-27.9 F)
n/a
n/a
Feb
26.1 C (79.0 F)
-31.1 C (-24.0 F)
n/a
n/a
Mar
31.1 C (88.0 F)
-28.9 C (-20.0 F)
n/a
n/a
Apr
35.0 C (95.0 F)
-14.4 C (6.1 F)
n/a
n/a
May
39.4 C (102.9 F)
-4.4 C (24.1 F)
n/a
n/a
Jun
40.6 C (105.1 F)
2.8 C (37.0 F)
n/a
n/a
Jul
45.0 C (113.0 F)
5.6 C (42.1 F)
n/a
n/a
Aug
44.4 C (111.9 F)
2.8 C (37.0 F)
n/a
n/a
Sep
40.6 C (105.1 F)
-3.9 C (25.0 F)
n/a
n/a
Oct
35.6 C (96.1 F)
-18.9 C (-2.0 F)
n/a
n/a
Nov
28.9 C (84.0 F)
-22.2 C (-8.0 F)
n/a
n/a
Dec
22.8 C (73.0 F)
-31.1 C (-24.0 F)
n/a
n/a
Which Years Hold Standing Records
1,464 standing records
Year with most
1,464 records at Tarkio still stand. 1936 holds the most, with 57.
Standing records at Tarkio by the year they were set
Year set
Standing records
1912
15
1913
38
1914
12
1915
15
1916
17
1917
28
1918
25
1919
17
1920
9
1921
19
1922
8
1923
12
1924
22
1925
24
1926
25
1927
10
1928
26
1929
27
1930
28
1931
19
1932
14
1933
19
1934
48
1935
14
1936
57
1937
18
1938
23
1939
22
1940
15
1941
7
1942
12
1943
15
1944
8
1945
17
1946
23
1947
15
1948
14
1949
8
1950
26
1951
17
1952
11
1953
21
1954
14
1955
14
1956
19
1957
5
1958
11
1959
11
1960
17
1961
11
1962
22
1963
18
1964
18
1965
16
1966
19
1967
14
1968
15
1969
4
1970
10
1971
12
1972
18
1973
11
1974
17
1975
16
1976
21
1977
8
1978
12
1979
1
1981
4
1982
3
1983
10
1984
11
1985
7
1986
7
1987
15
1988
18
1989
30
1990
5
1991
21
1992
25
1993
7
1996
16
1997
10
1998
10
1999
10
2000
13
2001
1
2002
16
2003
7
2004
17
2005
7
2006
8
2007
8
2008
4
All-Time Record Progression
7 new records
7 all-time records were set at Tarkio between 25 June 1942 and 23 December 1989. Each dot is a new record.
When Tarkio set new all-time records
Date
Kind
Detail
1942-06-25
Record daily precipitation
Record daily precipitation 146.1 mm (5.8 in)
1947-01-03
Record low minimum temperature
Record low minimum temperature -30.6 C (-23.1 F)
1947-01-04
Record low minimum temperature
Record low minimum temperature -33.3 C (-27.9 F)
1960-03-16
Record snow depth
Record snow depth 61.0 cm (24.0 in)
1983-12-24
Record low maximum temperature
Record low maximum temperature -21.7 C (-7.1 F)
1989-12-22
Record low maximum temperature
Record low maximum temperature -22.2 C (-8.0 F)
1989-12-23
Record low maximum temperature
Record low maximum temperature -23.3 C (-9.9 F)
Wettest Day of Each Month
Jun: 146.1 mm (5.8 in)
The wettest day on record for each calendar month at Tarkio. The most was 146.1 mm (5.8 in) on 25 June 1942.
Record daily precipitation for each month at Tarkio
Month
Record daily precipitation (mm)
Date
Jan
39.4 mm (1.6 in)
12 January 1960
Feb
55.9 mm (2.2 in)
13 February 1919
Mar
62.7 mm (2.5 in)
26 March 1998
Apr
82.0 mm (3.2 in)
13 April 1955
May
100.3 mm (3.9 in)
31 May 1917
Jun
146.1 mm (5.8 in)
25 June 1942
Jul
138.7 mm (5.5 in)
8 July 1987
Aug
119.4 mm (4.7 in)
3 August 1945
Sep
110.2 mm (4.3 in)
7 September 1941
Oct
97.8 mm (3.9 in)
31 October 1941
Nov
82.8 mm (3.3 in)
23 November 1931
Dec
55.9 mm (2.2 in)
15 December 1995
Period of Record Coverage
1912 to 2008
Complete yearUnder 90 percent of days
95 years of record at Tarkio, 1912 to 2008. 24 years have data for under 90 percent of days and are left out of rankings: 1912, 1913, 1914, 1943, 1944, 1978, 1979, 1981 and others.
Cooler than the station meanWarmer than the station mean
One stripe for each of 66 complete years at Tarkio, 1915 to 2007. Blue stripes are years cooler than the station's own mean of 11.1 C (52.0 F); red stripes are warmer. The coolest year was 1929, at 9.1 C (48.5 F), and the warmest was 1931, at 12.8 C (55.1 F). The strongest colour marks a difference of 2.0 C (3.6 F).
Annual mean temperature at Tarkio as warming stripes, 1915 to 2007
Year
Annual mean temperature
Difference from the station mean
1915
10.8 C
-0.27 C
1916
10.8 C
-0.35 C
1917
9.8 C
-1.27 C
1918
11.8 C
+0.71 C
1919
11.2 C
+0.07 C
1922
11.5 C
+0.42 C
1923
11.2 C
+0.12 C
1924
9.6 C
-1.56 C
1925
11.0 C
-0.07 C
1926
9.9 C
-1.20 C
1927
10.9 C
-0.23 C
1928
10.8 C
-0.30 C
1929
9.1 C
-1.97 C
1930
11.5 C
+0.38 C
1931
12.8 C
+1.71 C
1932
10.5 C
-0.64 C
1933
11.8 C
+0.67 C
1934
12.7 C
+1.54 C
1935
10.8 C
-0.32 C
1936
10.9 C
-0.17 C
1937
10.2 C
-0.94 C
1938
12.3 C
+1.16 C
1939
12.3 C
+1.16 C
1940
10.1 C
-1.00 C
1941
11.9 C
+0.81 C
1942
10.9 C
-0.20 C
1945
10.0 C
-1.09 C
1946
11.8 C
+0.72 C
1947
10.8 C
-0.30 C
1948
10.5 C
-0.65 C
1949
10.4 C
-0.73 C
1950
9.3 C
-1.77 C
1951
9.9 C
-1.23 C
1952
11.8 C
+0.64 C
1953
12.6 C
+1.52 C
1954
12.5 C
+1.36 C
1955
11.4 C
+0.32 C
1956
12.3 C
+1.15 C
1957
11.3 C
+0.23 C
1958
11.0 C
-0.12 C
1959
10.8 C
-0.27 C
1960
10.2 C
-0.92 C
1961
10.6 C
-0.53 C
1962
11.0 C
-0.08 C
1963
11.9 C
+0.75 C
1964
12.0 C
+0.86 C
1965
11.3 C
+0.20 C
1966
11.0 C
-0.11 C
1967
11.0 C
-0.12 C
1968
11.3 C
+0.16 C
1969
10.7 C
-0.39 C
1970
11.4 C
+0.28 C
1971
11.4 C
+0.33 C
1972
11.0 C
-0.16 C
1973
11.7 C
+0.63 C
1974
11.6 C
+0.51 C
1975
11.2 C
+0.08 C
1987
12.2 C
+1.05 C
1988
11.4 C
+0.29 C
1992
10.2 C
-0.88 C
1998
11.4 C
+0.29 C
2002
11.2 C
+0.08 C
2003
10.5 C
-0.58 C
2004
10.6 C
-0.50 C
2006
11.7 C
+0.61 C
2007
10.9 C
-0.20 C
The fitted trend in annual mean temperature here over 1915 to 2007 is 0.04 C (-0.05 to 0.12) per decade. The interval includes zero, so the trend is not clearly different from zero. In Fahrenheit: 0.1 F (-0.1 to 0.2) per decade. The slope is a straight line fitted to 66 complete years; the brackets give its 95 percent interval.
Fitted temperature trends per decade at Tarkio
Measure
Per decade (C)
Per decade (F)
Period
Complete years
Reading
Annual mean temperature
0.04 C (-0.05 to 0.12) per decade
0.1 F (-0.1 to 0.2) per decade
1915 to 2007
66
Not clearly different from zero
Mean daily maximum
0.05 C (-0.06 to 0.15) per decade
0.1 F (-0.1 to 0.3) per decade
1915 to 2007
66
Not clearly different from zero
Mean daily minimum
0.02 C (-0.05 to 0.10) per decade
0.04 F (-0.09 to 0.18) per decade
1915 to 2007
66
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
1912 to 2008
Yearly extremes at Tarkio: the record and the median year
Measure
Record
Year of the record
Median year
Years with a value
Hottest day (TXx)
45.0 C (113.0 F)
1936
37.8 C (100.0 F)
95
Coldest night (TNn)
-33.3 C (-27.9 F)
1947
-23.9 C (-11.0 F)
95
Wettest day (Rx1day)
146.1 mm (5.8 in)
1942
67.6 mm (2.7 in)
95
Wettest five days (Rx5day)
189.7 mm (7.5 in)
1965
103.5 mm (4.1 in)
95
Longest dry spell (CDD)
62 days
1976
26 days
95
Hottest day (TXx)
The hottest day of the year at Tarkio, 1912 to 2008. The record is 45.0 C (113.0 F) in 1936, marked on the chart; the median year is 37.8 C (100.0 F).
Hottest day (TXx) at Tarkio by year
Year
Hottest day (TXx)
1912
38.3 C (100.9 F)
1913
42.2 C (108.0 F)
1914
40.0 C (104.0 F)
1915
34.4 C (93.9 F)
1916
37.2 C (99.0 F)
1917
39.4 C (102.9 F)
1918
41.7 C (107.1 F)
1919
38.3 C (100.9 F)
1920
36.1 C (97.0 F)
1921
37.8 C (100.0 F)
1922
40.6 C (105.1 F)
1923
36.7 C (98.1 F)
1924
37.2 C (99.0 F)
1925
40.0 C (104.0 F)
1926
37.8 C (100.0 F)
1927
36.1 C (97.0 F)
1928
35.0 C (95.0 F)
1929
37.2 C (99.0 F)
1930
40.6 C (105.1 F)
1931
40.6 C (105.1 F)
1932
36.7 C (98.1 F)
1933
40.0 C (104.0 F)
1934
44.4 C (111.9 F)
1935
39.4 C (102.9 F)
1936
45.0 C (113.0 F)
1937
40.0 C (104.0 F)
1938
38.3 C (100.9 F)
1939
40.6 C (105.1 F)
1940
42.2 C (108.0 F)
1941
40.6 C (105.1 F)
1942
37.8 C (100.0 F)
1943
37.8 C (100.0 F)
1944
38.3 C (100.9 F)
1945
38.3 C (100.9 F)
1946
40.0 C (104.0 F)
1947
38.9 C (102.0 F)
1948
37.2 C (99.0 F)
1949
36.1 C (97.0 F)
1950
37.2 C (99.0 F)
1951
36.1 C (97.0 F)
1952
40.6 C (105.1 F)
1953
39.4 C (102.9 F)
1954
41.1 C (106.0 F)
1955
40.0 C (104.0 F)
1956
41.1 C (106.0 F)
1957
39.4 C (102.9 F)
1958
35.0 C (95.0 F)
1959
36.1 C (97.0 F)
1960
37.2 C (99.0 F)
1961
36.7 C (98.1 F)
1962
37.8 C (100.0 F)
1963
40.0 C (104.0 F)
1964
40.6 C (105.1 F)
1965
35.6 C (96.1 F)
1966
41.1 C (106.0 F)
1967
36.7 C (98.1 F)
1968
36.7 C (98.1 F)
1969
36.7 C (98.1 F)
1970
38.9 C (102.0 F)
1971
37.8 C (100.0 F)
1972
36.7 C (98.1 F)
1973
35.0 C (95.0 F)
1974
41.1 C (106.0 F)
1975
39.4 C (102.9 F)
1976
37.8 C (100.0 F)
1977
38.3 C (100.9 F)
1978
37.2 C (99.0 F)
1979
36.1 C (97.0 F)
1981
38.3 C (100.9 F)
1982
33.3 C (91.9 F)
1983
41.1 C (106.0 F)
1984
37.2 C (99.0 F)
1985
35.6 C (96.1 F)
1986
31.7 C (89.1 F)
1987
37.8 C (100.0 F)
1988
37.8 C (100.0 F)
1989
36.7 C (98.1 F)
1990
25.0 C (77.0 F)
1991
37.2 C (99.0 F)
1992
33.3 C (91.9 F)
1993
37.2 C (99.0 F)
1995
22.2 C (72.0 F)
1996
35.6 C (96.1 F)
1997
36.7 C (98.1 F)
1998
37.8 C (100.0 F)
1999
37.2 C (99.0 F)
2000
35.0 C (95.0 F)
2001
23.3 C (73.9 F)
2002
37.8 C (100.0 F)
2003
39.4 C (102.9 F)
2004
33.9 C (93.0 F)
2005
34.4 C (93.9 F)
2006
36.7 C (98.1 F)
2007
35.6 C (96.1 F)
2008
32.8 C (91.0 F)
Coldest night (TNn)
The coldest night of the year at Tarkio, 1912 to 2008. The record is -33.3 C (-27.9 F) in 1947, marked on the chart; the median year is -23.9 C (-11.0 F).
Coldest night (TNn) at Tarkio by year
Year
Coldest night (TNn)
1912
-16.1 C (3.0 F)
1913
-23.9 C (-11.0 F)
1914
-23.9 C (-11.0 F)
1915
-30.0 C (-22.0 F)
1916
-30.0 C (-22.0 F)
1917
-28.3 C (-18.9 F)
1918
-28.9 C (-20.0 F)
1919
-30.0 C (-22.0 F)
1920
-21.1 C (-6.0 F)
1921
-18.3 C (-0.9 F)
1922
-20.6 C (-5.1 F)
1923
-21.7 C (-7.1 F)
1924
-30.0 C (-22.0 F)
1925
-21.1 C (-6.0 F)
1926
-23.3 C (-9.9 F)
1927
-23.9 C (-11.0 F)
1928
-23.3 C (-9.9 F)
1929
-25.0 C (-13.0 F)
1930
-28.9 C (-20.0 F)
1931
-17.8 C (0.0 F)
1932
-26.1 C (-15.0 F)
1933
-27.8 C (-18.0 F)
1934
-24.4 C (-11.9 F)
1935
-23.3 C (-9.9 F)
1936
-30.0 C (-22.0 F)
1937
-21.7 C (-7.1 F)
1938
-22.8 C (-9.0 F)
1939
-22.2 C (-8.0 F)
1940
-28.3 C (-18.9 F)
1941
-17.2 C (1.0 F)
1942
-25.0 C (-13.0 F)
1943
-27.2 C (-17.0 F)
1944
-21.1 C (-6.0 F)
1945
-28.9 C (-20.0 F)
1946
-26.1 C (-15.0 F)
1947
-33.3 C (-27.9 F)
1948
-28.9 C (-20.0 F)
1949
-24.4 C (-11.9 F)
1950
-26.1 C (-15.0 F)
1951
-26.1 C (-15.0 F)
1952
-18.9 C (-2.0 F)
1953
-22.2 C (-8.0 F)
1954
-23.9 C (-11.0 F)
1955
-25.0 C (-13.0 F)
1956
-25.0 C (-13.0 F)
1957
-23.3 C (-9.9 F)
1958
-27.2 C (-17.0 F)
1959
-26.1 C (-15.0 F)
1960
-28.9 C (-20.0 F)
1961
-26.1 C (-15.0 F)
1962
-27.2 C (-17.0 F)
1963
-27.2 C (-17.0 F)
1964
-22.2 C (-8.0 F)
1965
-25.0 C (-13.0 F)
1966
-27.8 C (-18.0 F)
1967
-23.9 C (-11.0 F)
1968
-28.9 C (-20.0 F)
1969
-22.2 C (-8.0 F)
1970
-25.0 C (-13.0 F)
1971
-31.1 C (-24.0 F)
1972
-25.0 C (-13.0 F)
1973
-25.0 C (-13.0 F)
1974
-32.2 C (-26.0 F)
1975
-23.9 C (-11.0 F)
1976
-25.6 C (-14.1 F)
1977
-28.3 C (-18.9 F)
1978
-31.1 C (-24.0 F)
1979
-6.7 C (19.9 F)
1981
-16.7 C (1.9 F)
1982
-23.3 C (-9.9 F)
1983
-30.0 C (-22.0 F)
1984
-16.7 C (1.9 F)
1985
-26.1 C (-15.0 F)
1986
-18.9 C (-2.0 F)
1987
-17.8 C (0.0 F)
1988
-27.8 C (-18.0 F)
1989
-31.1 C (-24.0 F)
1990
-19.4 C (-2.9 F)
1991
-22.2 C (-8.0 F)
1992
-18.9 C (-2.0 F)
1993
-22.8 C (-9.0 F)
1995
-17.8 C (0.0 F)
1996
-22.2 C (-8.0 F)
1997
-23.9 C (-11.0 F)
1998
-26.1 C (-15.0 F)
1999
-18.3 C (-0.9 F)
2000
-16.7 C (1.9 F)
2001
-4.4 C (24.1 F)
2002
-18.9 C (-2.0 F)
2003
-23.3 C (-9.9 F)
2004
-24.4 C (-11.9 F)
2005
-23.3 C (-9.9 F)
2006
-19.4 C (-2.9 F)
2007
-23.9 C (-11.0 F)
2008
-23.9 C (-11.0 F)
Wettest day (Rx1day)
The wettest day of the year at Tarkio, 1912 to 2008. The record is 146.1 mm (5.8 in) in 1942, marked on the chart; the median year is 67.6 mm (2.7 in).
Wettest day (Rx1day) at Tarkio by year
Year
Wettest day (Rx1day)
1912
52.1 mm (2.1 in)
1913
63.5 mm (2.5 in)
1914
66.5 mm (2.6 in)
1915
85.9 mm (3.4 in)
1916
67.6 mm (2.7 in)
1917
100.3 mm (3.9 in)
1918
74.7 mm (2.9 in)
1919
77.0 mm (3.0 in)
1920
49.5 mm (1.9 in)
1921
58.9 mm (2.3 in)
1922
67.3 mm (2.6 in)
1923
41.7 mm (1.6 in)
1924
65.8 mm (2.6 in)
1925
108.2 mm (4.3 in)
1926
73.4 mm (2.9 in)
1927
50.0 mm (2.0 in)
1928
80.0 mm (3.1 in)
1929
63.5 mm (2.5 in)
1930
56.1 mm (2.2 in)
1931
82.8 mm (3.3 in)
1932
56.6 mm (2.2 in)
1933
69.1 mm (2.7 in)
1934
79.8 mm (3.1 in)
1935
61.7 mm (2.4 in)
1936
44.5 mm (1.8 in)
1937
122.4 mm (4.8 in)
1938
57.2 mm (2.3 in)
1939
51.1 mm (2.0 in)
1940
46.7 mm (1.8 in)
1941
110.2 mm (4.3 in)
1942
146.1 mm (5.8 in)
1943
44.2 mm (1.7 in)
1944
59.9 mm (2.4 in)
1945
119.4 mm (4.7 in)
1946
71.6 mm (2.8 in)
1947
75.4 mm (3.0 in)
1948
57.4 mm (2.3 in)
1949
117.3 mm (4.6 in)
1950
57.9 mm (2.3 in)
1951
45.7 mm (1.8 in)
1952
85.9 mm (3.4 in)
1953
42.2 mm (1.7 in)
1954
59.4 mm (2.3 in)
1955
82.0 mm (3.2 in)
1956
56.9 mm (2.2 in)
1957
64.0 mm (2.5 in)
1958
99.1 mm (3.9 in)
1959
91.9 mm (3.6 in)
1960
87.6 mm (3.4 in)
1961
78.7 mm (3.1 in)
1962
50.8 mm (2.0 in)
1963
55.9 mm (2.2 in)
1964
47.2 mm (1.9 in)
1965
110.7 mm (4.4 in)
1966
55.4 mm (2.2 in)
1967
55.9 mm (2.2 in)
1968
42.7 mm (1.7 in)
1969
66.0 mm (2.6 in)
1970
38.1 mm (1.5 in)
1971
77.5 mm (3.1 in)
1972
60.2 mm (2.4 in)
1973
83.1 mm (3.3 in)
1974
49.5 mm (1.9 in)
1975
82.6 mm (3.3 in)
1976
90.2 mm (3.6 in)
1977
82.6 mm (3.3 in)
1978
55.9 mm (2.2 in)
1979
43.2 mm (1.7 in)
1981
50.8 mm (2.0 in)
1982
82.6 mm (3.3 in)
1983
71.1 mm (2.8 in)
1984
89.9 mm (3.5 in)
1985
70.1 mm (2.8 in)
1986
103.1 mm (4.1 in)
1987
138.7 mm (5.5 in)
1988
53.8 mm (2.1 in)
1989
114.8 mm (4.5 in)
1990
24.4 mm (1.0 in)
1991
88.9 mm (3.5 in)
1992
82.6 mm (3.3 in)
1993
80.0 mm (3.1 in)
1995
55.9 mm (2.2 in)
1996
69.6 mm (2.7 in)
1997
73.7 mm (2.9 in)
1998
112.5 mm (4.4 in)
1999
68.8 mm (2.7 in)
2000
50.8 mm (2.0 in)
2001
16.5 mm (0.6 in)
2002
82.6 mm (3.3 in)
2003
81.8 mm (3.2 in)
2004
88.4 mm (3.5 in)
2005
57.2 mm (2.3 in)
2006
32.0 mm (1.3 in)
2007
80.3 mm (3.2 in)
2008
48.3 mm (1.9 in)
Wettest five days (Rx5day)
The wettest five days of the year at Tarkio, 1912 to 2008. The record is 189.7 mm (7.5 in) in 1965, marked on the chart; the median year is 103.5 mm (4.1 in).
Wettest five days (Rx5day) at Tarkio by year
Year
Wettest five days (Rx5day)
1912
90.4 mm (3.6 in)
1913
66.5 mm (2.6 in)
1914
110.1 mm (4.3 in)
1915
180.6 mm (7.1 in)
1916
103.2 mm (4.1 in)
1917
171.7 mm (6.8 in)
1918
119.4 mm (4.7 in)
1919
119.5 mm (4.7 in)
1920
66.6 mm (2.6 in)
1921
111.8 mm (4.4 in)
1922
114.3 mm (4.5 in)
1923
53.1 mm (2.1 in)
1924
116.3 mm (4.6 in)
1925
114.6 mm (4.5 in)
1926
182.7 mm (7.2 in)
1927
71.6 mm (2.8 in)
1928
127.3 mm (5.0 in)
1929
113.0 mm (4.4 in)
1930
71.4 mm (2.8 in)
1931
129.8 mm (5.1 in)
1932
73.9 mm (2.9 in)
1933
107.4 mm (4.2 in)
1934
105.4 mm (4.1 in)
1935
115.1 mm (4.5 in)
1936
103.3 mm (4.1 in)
1937
171.5 mm (6.8 in)
1938
82.3 mm (3.2 in)
1939
82.7 mm (3.3 in)
1940
96.0 mm (3.8 in)
1941
121.3 mm (4.8 in)
1942
154.0 mm (6.1 in)
1943
123.0 mm (4.8 in)
1944
71.1 mm (2.8 in)
1945
122.4 mm (4.8 in)
1946
96.9 mm (3.8 in)
1947
127.5 mm (5.0 in)
1948
59.4 mm (2.3 in)
1949
139.2 mm (5.5 in)
1950
101.6 mm (4.0 in)
1951
67.5 mm (2.7 in)
1952
179.4 mm (7.1 in)
1953
75.7 mm (3.0 in)
1954
96.0 mm (3.8 in)
1955
94.4 mm (3.7 in)
1956
64.8 mm (2.6 in)
1957
91.4 mm (3.6 in)
1958
122.2 mm (4.8 in)
1959
118.4 mm (4.7 in)
1960
99.3 mm (3.9 in)
1961
118.0 mm (4.6 in)
1962
124.5 mm (4.9 in)
1963
77.5 mm (3.1 in)
1964
79.3 mm (3.1 in)
1965
189.7 mm (7.5 in)
1966
77.9 mm (3.1 in)
1967
103.5 mm (4.1 in)
1968
69.4 mm (2.7 in)
1969
86.9 mm (3.4 in)
1970
79.5 mm (3.1 in)
1971
112.8 mm (4.4 in)
1972
69.2 mm (2.7 in)
1973
134.7 mm (5.3 in)
1974
83.6 mm (3.3 in)
1975
122.7 mm (4.8 in)
1976
100.8 mm (4.0 in)
1977
130.4 mm (5.1 in)
1978
117.9 mm (4.6 in)
1979
59.0 mm (2.3 in)
1981
122.3 mm (4.8 in)
1982
94.0 mm (3.7 in)
1983
85.9 mm (3.4 in)
1984
111.5 mm (4.4 in)
1985
92.9 mm (3.7 in)
1986
104.2 mm (4.1 in)
1987
141.5 mm (5.6 in)
1988
64.0 mm (2.5 in)
1989
174.0 mm (6.9 in)
1990
56.4 mm (2.2 in)
1991
101.4 mm (4.0 in)
1992
158.8 mm (6.3 in)
1993
168.9 mm (6.6 in)
1995
76.1 mm (3.0 in)
1996
126.7 mm (5.0 in)
1997
78.5 mm (3.1 in)
1998
121.1 mm (4.8 in)
1999
77.4 mm (3.0 in)
2000
55.6 mm (2.2 in)
2001
21.1 mm (0.8 in)
2002
117.0 mm (4.6 in)
2003
129.6 mm (5.1 in)
2004
114.5 mm (4.5 in)
2005
74.9 mm (2.9 in)
2006
64.7 mm (2.5 in)
2007
114.3 mm (4.5 in)
2008
83.3 mm (3.3 in)
Longest dry spell (CDD)
The longest dry spell of the year at Tarkio, 1912 to 2008. The record is 62 days in 1976, marked on the chart; the median year is 26 days.
Longest dry spell (CDD) at Tarkio by year
Year
Longest dry spell (CDD)
1912
29 days
1913
27 days
1914
52 days
1915
24 days
1916
27 days
1917
49 days
1918
22 days
1919
29 days
1920
25 days
1921
47 days
1922
25 days
1923
29 days
1924
28 days
1925
26 days
1926
27 days
1927
49 days
1928
36 days
1929
15 days
1930
29 days
1931
30 days
1932
30 days
1933
28 days
1934
36 days
1935
21 days
1936
43 days
1937
32 days
1938
25 days
1939
37 days
1940
21 days
1941
25 days
1942
31 days
1943
21 days
1944
17 days
1945
24 days
1946
45 days
1947
26 days
1948
29 days
1949
27 days
1950
26 days
1951
15 days
1952
54 days
1953
22 days
1954
49 days
1955
21 days
1956
18 days
1957
19 days
1958
36 days
1959
27 days
1960
22 days
1961
23 days
1962
15 days
1963
21 days
1964
20 days
1965
21 days
1966
25 days
1967
29 days
1968
26 days
1969
21 days
1970
41 days
1971
26 days
1972
21 days
1973
19 days
1974
22 days
1975
25 days
1976
62 days
1977
27 days
1978
22 days
1979
21 days
1981
31 days
1982
19 days
1983
27 days
1984
29 days
1985
34 days
1986
23 days
1987
21 days
1988
35 days
1989
37 days
1990
19 days
1991
21 days
1992
25 days
1993
34 days
1995
14 days
1996
26 days
1997
21 days
1998
25 days
1999
29 days
2000
52 days
2001
31 days
2002
46 days
2003
28 days
2004
31 days
2005
30 days
2006
33 days
2007
23 days
2008
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
66 years with a frost
Across 66 years with a frost, the median last spring frost at Tarkio falls on 24 April and the median first autumn frost on 10 October, which leaves a median of 171 days between them.
In 1955 to 2007 the median growing season was 172 days. The two periods have the same number of growing days.
Fitted over all years, the growing season changes by +0.6 days per decade at this station.
Frost dates and growing season at Tarkio
Measure
Median, all years
Earliest period (1915 to 1948)
Recent period (1955 to 2007)
Recent against earliest
Fitted trend
Last spring frost
24 April
24 April
24 April
no change
-0.6 days per decade
First autumn frost
10 October
11 October
11 October
no change
0.0 days per decade
Growing days
171 days
172 days
172 days
no change
+0.6 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
71 years, 1913 to 2007
A day with at least 69.4 mm (2.7 in) of rain is expected about once in 2 years. A day with at least 151.9 mm (6.0 in) of rain is expected about once in 100 years.
Rainfall return levels at Tarkio: the daily rain expected about once in a given number of years
Expected about once in
A day with at least
Note
2 years
69.4 mm (2.7 in)
5 years
91.5 mm (3.6 in)
10 years
106.2 mm (4.2 in)
25 years
124.6 mm (4.9 in)
50 years
138.3 mm (5.4 in)
100 years
151.9 mm (6.0 in)
Longer than the 71 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, 71 years of values from 1913 to 2007.
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: 146.1 mm (5.8 in) in 1942; 138.7 mm (5.5 in) in 1987; 122.4 mm (4.8 in) in 1937.
Station Changes
3 suspected
3 changes were suspected in the annual mean temperature of Tarkio, at 1925, 1951 and 1975. Each is measured against neighbouring stations.
Relative to 5 neighbouring stations, the station's annual mean temperature from 1925 ran 0.3 C (0.6 F) lower than in the years before (likely change).
Relative to 5 neighbouring stations, the station's annual mean temperature from 1951 ran 0.5 C (0.8 F) higher than in the years before (likely change).
Relative to 5 neighbouring stations, the station's annual mean temperature from 1975 ran 0.4 C (0.6 F) lower than in the years before (likely change).
Suspected changes in the annual mean temperature at Tarkio, against neighbouring stations
Year
Shift (C)
Shift (F)
Strength
Neighbours
1925
-0.3
-0.6
likely
5
1951
+0.5
+0.8
likely
5
1975
-0.4
-0.6
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 Tarkio standing records by year: CSV or JSON. Field meanings are on the data page.
Data for Tarkio 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.