Record envelope, standing records and threshold days for Alton 1 W (USC00140201), Kansas, United States, with 106 years of record.
Key Facts for Alton 1 W
Alton 1 W (USC00140201) is a weather station in Kansas, United States at 39.48 latitude and -98.97 longitude, 514 m (1,685 ft) above sea level.
The station reports from 1902 to 2007, 106 years of record.
1,464 records set at Alton 1 W still stand.
Records are tracked for tmax, tmin, prcp, snow, snwd: an element needs 30 years of data to be eligible.
Alton 1 W set a daily record high minimum temperature of 21.1 C (70.0 F) on 7 October 2007.
About the Station
Location: Kansas, United States, 39.48 latitude, -98.97 longitude.
Elevation: 514 m (1,685 ft).
Period of record: 1902 to 2007, 106 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 Alton 1 W. 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 Alton 1 W, with 2026 drawn through them
Month
Highest record high
Lowest record low
2026 highest maximum
2026 lowest minimum
Jan
26.7 C (80.1 F)
-31.7 C (-25.1 F)
n/a
n/a
Feb
30.6 C (87.1 F)
-33.9 C (-29.0 F)
n/a
n/a
Mar
37.2 C (99.0 F)
-27.2 C (-17.0 F)
n/a
n/a
Apr
41.1 C (106.0 F)
-13.3 C (8.1 F)
n/a
n/a
May
40.6 C (105.1 F)
-7.2 C (19.0 F)
n/a
n/a
Jun
45.6 C (114.1 F)
0.6 C (33.1 F)
n/a
n/a
Jul
49.4 C (120.9 F)
5.0 C (41.0 F)
n/a
n/a
Aug
46.7 C (116.1 F)
0.6 C (33.1 F)
n/a
n/a
Sep
44.4 C (111.9 F)
-7.8 C (18.0 F)
n/a
n/a
Oct
39.4 C (102.9 F)
-14.4 C (6.1 F)
n/a
n/a
Nov
31.1 C (88.0 F)
-24.4 C (-11.9 F)
n/a
n/a
Dec
27.8 C (82.0 F)
-35.0 C (-31.0 F)
n/a
n/a
Which Years Hold Standing Records
1,464 standing records
Year with most
1,464 records at Alton 1 W still stand. 1936 holds the most, with 46.
Standing records at Alton 1 W by the year they were set
Year set
Standing records
1902
3
1903
14
1904
10
1905
21
1906
12
1907
15
1908
4
1909
19
1910
15
1911
32
1912
13
1913
29
1914
10
1915
12
1916
21
1917
20
1918
25
1919
13
1920
15
1921
17
1922
9
1923
5
1924
20
1925
8
1926
10
1927
10
1928
14
1929
15
1930
28
1931
25
1932
13
1933
22
1934
42
1935
17
1936
46
1937
13
1938
14
1939
21
1940
16
1941
10
1942
16
1943
20
1944
9
1945
8
1946
17
1947
13
1948
4
1949
7
1950
13
1951
17
1952
15
1953
16
1954
11
1955
15
1956
13
1957
4
1958
7
1959
14
1960
16
1961
4
1962
20
1963
14
1964
15
1965
11
1966
7
1967
8
1968
11
1969
6
1970
9
1971
6
1972
6
1973
5
1974
11
1975
12
1976
6
1977
8
1978
8
1979
9
1980
10
1981
6
1982
3
1983
2
1984
10
1985
31
1986
9
1987
14
1988
22
1989
40
1990
18
1991
26
1992
11
1993
9
1994
10
1995
9
1996
11
1997
21
1998
17
1999
14
2000
15
2001
5
2002
9
2003
7
2004
17
2005
14
2006
8
2007
7
All-Time Record Progression
6 new records
6 all-time records were set at Alton 1 W between 13 July 1934 and 23 December 1989. Each dot is a new record.
When Alton 1 W set new all-time records
Date
Kind
Detail
1934-07-13
Record high maximum temperature
Record high maximum temperature 45.6 C (114.1 F)
1936-07-17
Record high maximum temperature
Record high maximum temperature 46.7 C (116.1 F)
1936-07-24
Record high maximum temperature
Record high maximum temperature 49.4 C (120.9 F)
1936-08-17
Record high minimum temperature
Record high minimum temperature 31.7 C (89.1 F)
1961-05-22
Record daily precipitation
Record daily precipitation 156.2 mm (6.1 in)
1989-12-23
Record low minimum temperature
Record low minimum temperature -35.0 C (-31.0 F)
Wettest Day of Each Month
May: 156.2 mm (6.1 in)
The wettest day on record for each calendar month at Alton 1 W. The most was 156.2 mm (6.1 in) on 22 May 1961.
Record daily precipitation for each month at Alton 1 W
Month
Record daily precipitation (mm)
Date
Jan
36.8 mm (1.4 in)
26 January 1962
Feb
109.7 mm (4.3 in)
26 February 1912
Mar
81.3 mm (3.2 in)
23 March 1987
Apr
88.9 mm (3.5 in)
14 April 1987
May
156.2 mm (6.1 in)
22 May 1961
Jun
83.8 mm (3.3 in)
23 June 1993
Jul
105.7 mm (4.2 in)
5 July 1993
Aug
123.7 mm (4.9 in)
14 August 1912
Sep
119.9 mm (4.7 in)
12 September 1961
Oct
86.4 mm (3.4 in)
10 October 1949
Nov
84.6 mm (3.3 in)
16 November 1996
Dec
32.3 mm (1.3 in)
16 December 1984
Period of Record Coverage
1902 to 2007
Complete yearUnder 90 percent of days
106 years of record at Alton 1 W, 1902 to 2007. 11 years have data for under 90 percent of days and are left out of rankings: 1902, 1907, 1908, 1937, 1972, 1979, 1981, 1983 and others.
Cooler than the station meanWarmer than the station mean
One stripe for each of 87 complete years at Alton 1 W, 1903 to 2006. Blue stripes are years cooler than the station's own mean of 12.2 C (53.9 F); red stripes are warmer. The coolest year was 1993, at 9.7 C (49.4 F), and the warmest was 1934, at 14.7 C (58.4 F). The strongest colour marks a difference of 2.6 C (4.7 F).
Annual mean temperature at Alton 1 W as warming stripes, 1903 to 2006
Year
Annual mean temperature
Difference from the station mean
1903
11.5 C
-0.71 C
1906
12.1 C
-0.03 C
1909
11.6 C
-0.53 C
1910
12.6 C
+0.48 C
1912
11.2 C
-0.98 C
1913
12.9 C
+0.76 C
1914
12.7 C
+0.56 C
1915
11.2 C
-0.92 C
1916
11.6 C
-0.57 C
1918
12.5 C
+0.38 C
1919
11.6 C
-0.60 C
1920
11.7 C
-0.46 C
1921
13.8 C
+1.66 C
1922
12.7 C
+0.53 C
1923
12.5 C
+0.32 C
1924
11.3 C
-0.86 C
1925
13.1 C
+0.92 C
1926
12.9 C
+0.76 C
1927
12.2 C
+0.04 C
1928
12.1 C
-0.05 C
1929
11.2 C
-0.93 C
1930
12.7 C
+0.51 C
1931
14.0 C
+1.79 C
1932
11.9 C
-0.25 C
1933
14.0 C
+1.85 C
1934
14.7 C
+2.53 C
1935
13.0 C
+0.87 C
1936
13.5 C
+1.38 C
1939
14.2 C
+2.01 C
1940
12.2 C
+0.03 C
1941
12.4 C
+0.26 C
1942
11.9 C
-0.23 C
1943
12.5 C
+0.33 C
1944
12.2 C
+0.04 C
1945
12.1 C
-0.04 C
1946
13.5 C
+1.31 C
1947
12.3 C
+0.17 C
1949
11.1 C
-1.02 C
1950
11.3 C
-0.83 C
1951
10.7 C
-1.42 C
1952
12.1 C
-0.03 C
1953
12.8 C
+0.68 C
1954
13.5 C
+1.34 C
1955
12.5 C
+0.35 C
1956
13.0 C
+0.80 C
1957
11.6 C
-0.56 C
1958
11.5 C
-0.69 C
1959
12.2 C
+0.02 C
1960
10.9 C
-1.27 C
1961
11.3 C
-0.85 C
1962
12.0 C
-0.12 C
1963
13.3 C
+1.15 C
1964
13.0 C
+0.83 C
1965
12.2 C
+0.08 C
1966
11.7 C
-0.51 C
1967
12.1 C
-0.06 C
1968
12.2 C
+0.01 C
1969
11.6 C
-0.56 C
1970
12.4 C
+0.23 C
1971
12.3 C
+0.18 C
1973
12.2 C
+0.02 C
1974
12.5 C
+0.36 C
1975
12.3 C
+0.15 C
1976
12.8 C
+0.68 C
1977
13.3 C
+1.17 C
1978
11.6 C
-0.61 C
1980
12.9 C
+0.78 C
1982
11.7 C
-0.49 C
1985
10.7 C
-1.44 C
1987
12.3 C
+0.16 C
1988
11.7 C
-0.45 C
1989
10.7 C
-1.51 C
1990
12.0 C
-0.12 C
1991
12.2 C
+0.08 C
1992
11.0 C
-1.14 C
1993
9.7 C
-2.49 C
1994
11.5 C
-0.69 C
1995
10.9 C
-1.24 C
1996
10.4 C
-1.72 C
1997
11.1 C
-1.11 C
1999
12.0 C
-0.14 C
2000
12.2 C
+0.01 C
2001
12.0 C
-0.18 C
2003
11.8 C
-0.38 C
2004
11.8 C
-0.37 C
2005
12.4 C
+0.19 C
2006
12.5 C
+0.29 C
The annual mean temperature here has fallen by 0.09 C (0.02 to 0.15) per decade over 1903 to 2006. In Fahrenheit: 0.15 F (0.04 to 0.27) per decade. The slope is a straight line fitted to 87 complete years; the brackets give its 95 percent interval.
Fitted temperature trends per decade at Alton 1 W
Measure
Per decade (C)
Per decade (F)
Period
Complete years
Reading
Annual mean temperature
-0.09 C (-0.15 to -0.02) per decade
-0.15 F (-0.27 to -0.04) per decade
1903 to 2006
87
Fall
Mean daily maximum
-0.03 C (-0.11 to 0.06) per decade
-0.05 F (-0.20 to 0.11) per decade
1903 to 2006
87
Not clearly different from zero
Mean daily minimum
-0.1 C (-0.2 to -0.1) per decade
-0.3 F (-0.4 to -0.2) per decade
1903 to 2006
87
Fall
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
1902 to 2007
Yearly extremes at Alton 1 W: the record and the median year
Measure
Record
Year of the record
Median year
Years with a value
Hottest day (TXx)
49.4 C (120.9 F)
1936
41.7 C (107.1 F)
106
Coldest night (TNn)
-35.0 C (-31.0 F)
1989
-24.1 C (-11.5 F)
106
Wettest day (Rx1day)
156.2 mm (6.1 in)
1961
53.9 mm (2.1 in)
106
Wettest five days (Rx5day)
266.3 mm (10.5 in)
1961
76.4 mm (3.0 in)
106
Longest dry spell (CDD)
84 days
1910
37 days
106
Hottest day (TXx)
The hottest day of the year at Alton 1 W, 1902 to 2007. The record is 49.4 C (120.9 F) in 1936, marked on the chart; the median year is 41.7 C (107.1 F).
Hottest day (TXx) at Alton 1 W by year
Year
Hottest day (TXx)
1902
15.6 C (60.1 F)
1903
38.3 C (100.9 F)
1904
37.8 C (100.0 F)
1905
41.1 C (106.0 F)
1906
39.4 C (102.9 F)
1907
42.8 C (109.0 F)
1908
39.4 C (102.9 F)
1909
41.1 C (106.0 F)
1910
43.3 C (109.9 F)
1911
44.4 C (111.9 F)
1912
40.6 C (105.1 F)
1913
45.0 C (113.0 F)
1914
42.2 C (108.0 F)
1915
35.0 C (95.0 F)
1916
42.2 C (108.0 F)
1917
42.8 C (109.0 F)
1918
42.8 C (109.0 F)
1919
41.1 C (106.0 F)
1920
40.6 C (105.1 F)
1921
41.7 C (107.1 F)
1922
43.3 C (109.9 F)
1923
41.7 C (107.1 F)
1924
43.9 C (111.0 F)
1925
42.8 C (109.0 F)
1926
43.3 C (109.9 F)
1927
38.3 C (100.9 F)
1928
37.2 C (99.0 F)
1929
41.7 C (107.1 F)
1930
45.0 C (113.0 F)
1931
42.8 C (109.0 F)
1932
41.1 C (106.0 F)
1933
43.3 C (109.9 F)
1934
45.6 C (114.1 F)
1935
43.3 C (109.9 F)
1936
49.4 C (120.9 F)
1937
44.4 C (111.9 F)
1938
43.3 C (109.9 F)
1939
45.0 C (113.0 F)
1940
46.7 C (116.1 F)
1941
40.6 C (105.1 F)
1942
40.0 C (104.0 F)
1943
43.9 C (111.0 F)
1944
39.4 C (102.9 F)
1945
41.1 C (106.0 F)
1946
43.3 C (109.9 F)
1947
44.4 C (111.9 F)
1948
40.6 C (105.1 F)
1949
38.3 C (100.9 F)
1950
42.2 C (108.0 F)
1951
40.6 C (105.1 F)
1952
41.7 C (107.1 F)
1953
43.3 C (109.9 F)
1954
44.4 C (111.9 F)
1955
42.2 C (108.0 F)
1956
43.9 C (111.0 F)
1957
38.3 C (100.9 F)
1958
37.8 C (100.0 F)
1959
41.7 C (107.1 F)
1960
42.2 C (108.0 F)
1961
39.4 C (102.9 F)
1962
36.7 C (98.1 F)
1963
40.6 C (105.1 F)
1964
43.9 C (111.0 F)
1965
40.0 C (104.0 F)
1966
42.8 C (109.0 F)
1967
38.3 C (100.9 F)
1968
40.6 C (105.1 F)
1969
42.8 C (109.0 F)
1970
41.7 C (107.1 F)
1971
41.1 C (106.0 F)
1972
36.1 C (97.0 F)
1973
40.6 C (105.1 F)
1974
41.7 C (107.1 F)
1975
40.0 C (104.0 F)
1976
41.1 C (106.0 F)
1977
41.7 C (107.1 F)
1978
42.2 C (108.0 F)
1979
39.4 C (102.9 F)
1980
44.4 C (111.9 F)
1981
40.6 C (105.1 F)
1982
39.4 C (102.9 F)
1983
36.1 C (97.0 F)
1984
45.0 C (113.0 F)
1985
44.4 C (111.9 F)
1986
41.7 C (107.1 F)
1987
41.1 C (106.0 F)
1988
45.0 C (113.0 F)
1989
41.7 C (107.1 F)
1990
43.3 C (109.9 F)
1991
44.4 C (111.9 F)
1992
35.6 C (96.1 F)
1993
37.2 C (99.0 F)
1994
39.4 C (102.9 F)
1995
43.3 C (109.9 F)
1996
38.9 C (102.0 F)
1997
41.7 C (107.1 F)
1998
42.2 C (108.0 F)
1999
42.8 C (109.0 F)
2000
43.9 C (111.0 F)
2001
42.2 C (108.0 F)
2002
37.8 C (100.0 F)
2003
43.3 C (109.9 F)
2004
40.0 C (104.0 F)
2005
42.2 C (108.0 F)
2006
43.9 C (111.0 F)
2007
39.4 C (102.9 F)
Coldest night (TNn)
The coldest night of the year at Alton 1 W, 1902 to 2007. The record is -35.0 C (-31.0 F) in 1989, marked on the chart; the median year is -24.1 C (-11.5 F).
Coldest night (TNn) at Alton 1 W by year
Year
Coldest night (TNn)
1902
-22.2 C (-8.0 F)
1903
-24.4 C (-11.9 F)
1904
-21.7 C (-7.1 F)
1905
-33.9 C (-29.0 F)
1906
-20.0 C (-4.0 F)
1907
-20.0 C (-4.0 F)
1908
-16.1 C (3.0 F)
1909
-24.4 C (-11.9 F)
1910
-27.8 C (-18.0 F)
1911
-23.9 C (-11.0 F)
1912
-31.7 C (-25.1 F)
1913
-31.1 C (-24.0 F)
1914
-23.9 C (-11.0 F)
1915
-24.4 C (-11.9 F)
1916
-30.0 C (-22.0 F)
1917
-26.7 C (-16.1 F)
1918
-29.4 C (-20.9 F)
1919
-29.4 C (-20.9 F)
1920
-24.4 C (-11.9 F)
1921
-20.6 C (-5.1 F)
1922
-21.1 C (-6.0 F)
1923
-20.6 C (-5.1 F)
1924
-30.0 C (-22.0 F)
1925
-26.7 C (-16.1 F)
1926
-20.0 C (-4.0 F)
1927
-23.9 C (-11.0 F)
1928
-28.9 C (-20.0 F)
1929
-26.7 C (-16.1 F)
1930
-26.1 C (-15.0 F)
1931
-18.9 C (-2.0 F)
1932
-29.4 C (-20.9 F)
1933
-27.8 C (-18.0 F)
1934
-21.7 C (-7.1 F)
1935
-23.3 C (-9.9 F)
1936
-26.7 C (-16.1 F)
1937
-25.6 C (-14.1 F)
1938
-22.2 C (-8.0 F)
1939
-23.9 C (-11.0 F)
1940
-27.2 C (-17.0 F)
1941
-21.7 C (-7.1 F)
1942
-26.1 C (-15.0 F)
1943
-28.9 C (-20.0 F)
1944
-25.6 C (-14.1 F)
1945
-24.4 C (-11.9 F)
1946
-22.8 C (-9.0 F)
1947
-29.4 C (-20.9 F)
1948
-26.1 C (-15.0 F)
1949
-20.6 C (-5.1 F)
1950
-23.9 C (-11.0 F)
1951
-27.8 C (-18.0 F)
1952
-23.3 C (-9.9 F)
1953
-21.1 C (-6.0 F)
1954
-22.2 C (-8.0 F)
1955
-21.7 C (-7.1 F)
1956
-23.9 C (-11.0 F)
1957
-23.3 C (-9.9 F)
1958
-19.4 C (-2.9 F)
1959
-30.0 C (-22.0 F)
1960
-27.2 C (-17.0 F)
1961
-30.0 C (-22.0 F)
1962
-27.8 C (-18.0 F)
1963
-28.3 C (-18.9 F)
1964
-23.9 C (-11.0 F)
1965
-22.8 C (-9.0 F)
1966
-27.8 C (-18.0 F)
1967
-24.4 C (-11.9 F)
1968
-27.2 C (-17.0 F)
1969
-24.4 C (-11.9 F)
1970
-22.2 C (-8.0 F)
1971
-27.2 C (-17.0 F)
1972
-23.9 C (-11.0 F)
1973
-22.2 C (-8.0 F)
1974
-29.4 C (-20.9 F)
1975
-21.7 C (-7.1 F)
1976
-23.3 C (-9.9 F)
1977
-23.3 C (-9.9 F)
1978
-27.2 C (-17.0 F)
1979
-27.2 C (-17.0 F)
1980
-26.1 C (-15.0 F)
1981
-26.1 C (-15.0 F)
1982
-27.2 C (-17.0 F)
1983
-19.4 C (-2.9 F)
1984
-16.7 C (1.9 F)
1985
-31.1 C (-24.0 F)
1986
-20.0 C (-4.0 F)
1987
-20.0 C (-4.0 F)
1988
-29.4 C (-20.9 F)
1989
-35.0 C (-31.0 F)
1990
-24.4 C (-11.9 F)
1991
-23.9 C (-11.0 F)
1992
-18.9 C (-2.0 F)
1993
-24.4 C (-11.9 F)
1994
-21.1 C (-6.0 F)
1995
-22.8 C (-9.0 F)
1996
-26.1 C (-15.0 F)
1997
-22.8 C (-9.0 F)
1998
-24.4 C (-11.9 F)
1999
-22.8 C (-9.0 F)
2000
-20.6 C (-5.1 F)
2001
-25.6 C (-14.1 F)
2002
-22.8 C (-9.0 F)
2003
-22.2 C (-8.0 F)
2004
-23.3 C (-9.9 F)
2005
-22.2 C (-8.0 F)
2006
-17.8 C (0.0 F)
2007
-21.7 C (-7.1 F)
Wettest day (Rx1day)
The wettest day of the year at Alton 1 W, 1902 to 2007. The record is 156.2 mm (6.1 in) in 1961, marked on the chart; the median year is 53.9 mm (2.1 in).
Wettest day (Rx1day) at Alton 1 W by year
Year
Wettest day (Rx1day)
1902
11.7 mm (0.5 in)
1903
108.2 mm (4.3 in)
1904
58.7 mm (2.3 in)
1905
60.5 mm (2.4 in)
1906
62.7 mm (2.5 in)
1907
44.5 mm (1.8 in)
1908
48.3 mm (1.9 in)
1909
49.5 mm (1.9 in)
1910
30.0 mm (1.2 in)
1911
50.8 mm (2.0 in)
1912
123.7 mm (4.9 in)
1913
31.8 mm (1.3 in)
1914
42.4 mm (1.7 in)
1915
64.5 mm (2.5 in)
1916
39.1 mm (1.5 in)
1917
29.0 mm (1.1 in)
1918
48.3 mm (1.9 in)
1919
108.7 mm (4.3 in)
1920
30.5 mm (1.2 in)
1921
67.3 mm (2.6 in)
1922
42.7 mm (1.7 in)
1923
62.5 mm (2.5 in)
1924
27.9 mm (1.1 in)
1925
39.9 mm (1.6 in)
1926
44.5 mm (1.8 in)
1927
89.4 mm (3.5 in)
1928
50.8 mm (2.0 in)
1929
65.5 mm (2.6 in)
1930
34.3 mm (1.4 in)
1931
86.4 mm (3.4 in)
1932
63.2 mm (2.5 in)
1933
31.8 mm (1.3 in)
1934
66.0 mm (2.6 in)
1935
57.2 mm (2.3 in)
1936
86.4 mm (3.4 in)
1937
22.9 mm (0.9 in)
1938
56.6 mm (2.2 in)
1939
42.4 mm (1.7 in)
1940
39.4 mm (1.6 in)
1941
71.1 mm (2.8 in)
1942
54.4 mm (2.1 in)
1943
50.8 mm (2.0 in)
1944
50.8 mm (2.0 in)
1945
77.5 mm (3.1 in)
1946
43.2 mm (1.7 in)
1947
34.3 mm (1.4 in)
1948
48.3 mm (1.9 in)
1949
86.4 mm (3.4 in)
1950
99.1 mm (3.9 in)
1951
77.5 mm (3.1 in)
1952
31.0 mm (1.2 in)
1953
51.6 mm (2.0 in)
1954
40.6 mm (1.6 in)
1955
71.1 mm (2.8 in)
1956
42.7 mm (1.7 in)
1957
60.5 mm (2.4 in)
1958
45.2 mm (1.8 in)
1959
44.5 mm (1.8 in)
1960
34.8 mm (1.4 in)
1961
156.2 mm (6.1 in)
1962
59.7 mm (2.4 in)
1963
64.0 mm (2.5 in)
1964
26.9 mm (1.1 in)
1965
59.7 mm (2.4 in)
1966
31.8 mm (1.3 in)
1967
55.4 mm (2.2 in)
1968
61.0 mm (2.4 in)
1969
26.7 mm (1.1 in)
1970
35.6 mm (1.4 in)
1971
48.3 mm (1.9 in)
1972
35.8 mm (1.4 in)
1973
79.8 mm (3.1 in)
1974
109.2 mm (4.3 in)
1975
86.4 mm (3.4 in)
1976
45.0 mm (1.8 in)
1977
72.6 mm (2.9 in)
1978
71.4 mm (2.8 in)
1979
47.0 mm (1.9 in)
1980
47.5 mm (1.9 in)
1981
41.7 mm (1.6 in)
1982
62.5 mm (2.5 in)
1983
28.2 mm (1.1 in)
1984
57.9 mm (2.3 in)
1985
52.3 mm (2.1 in)
1986
74.7 mm (2.9 in)
1987
88.9 mm (3.5 in)
1988
61.0 mm (2.4 in)
1989
72.4 mm (2.9 in)
1990
50.8 mm (2.0 in)
1991
66.5 mm (2.6 in)
1992
68.1 mm (2.7 in)
1993
105.7 mm (4.2 in)
1994
50.3 mm (2.0 in)
1995
59.7 mm (2.4 in)
1996
84.6 mm (3.3 in)
1997
45.7 mm (1.8 in)
1998
56.4 mm (2.2 in)
1999
53.3 mm (2.1 in)
2000
49.8 mm (2.0 in)
2001
87.6 mm (3.4 in)
2002
39.4 mm (1.6 in)
2003
40.6 mm (1.6 in)
2004
68.8 mm (2.7 in)
2005
86.4 mm (3.4 in)
2006
75.7 mm (3.0 in)
2007
91.2 mm (3.6 in)
Wettest five days (Rx5day)
The wettest five days of the year at Alton 1 W, 1902 to 2007. The record is 266.3 mm (10.5 in) in 1961, marked on the chart; the median year is 76.4 mm (3.0 in).
Wettest five days (Rx5day) at Alton 1 W by year
Year
Wettest five days (Rx5day)
1902
13.5 mm (0.5 in)
1903
122.2 mm (4.8 in)
1904
89.6 mm (3.5 in)
1905
88.4 mm (3.5 in)
1906
73.9 mm (2.9 in)
1907
58.7 mm (2.3 in)
1908
67.8 mm (2.7 in)
1909
63.4 mm (2.5 in)
1910
41.1 mm (1.6 in)
1911
67.4 mm (2.7 in)
1912
183.9 mm (7.2 in)
1913
54.3 mm (2.1 in)
1914
74.2 mm (2.9 in)
1915
88.9 mm (3.5 in)
1916
59.9 mm (2.4 in)
1917
39.4 mm (1.6 in)
1918
68.5 mm (2.7 in)
1919
164.6 mm (6.5 in)
1920
39.9 mm (1.6 in)
1921
78.8 mm (3.1 in)
1922
68.9 mm (2.7 in)
1923
86.6 mm (3.4 in)
1924
50.8 mm (2.0 in)
1925
47.0 mm (1.9 in)
1926
60.9 mm (2.4 in)
1927
118.4 mm (4.7 in)
1928
113.6 mm (4.5 in)
1929
84.6 mm (3.3 in)
1930
59.3 mm (2.3 in)
1931
106.0 mm (4.2 in)
1932
63.2 mm (2.5 in)
1933
52.1 mm (2.1 in)
1934
160.3 mm (6.3 in)
1935
80.8 mm (3.2 in)
1936
139.8 mm (5.5 in)
1937
39.6 mm (1.6 in)
1938
73.6 mm (2.9 in)
1939
47.4 mm (1.9 in)
1940
60.7 mm (2.4 in)
1941
122.6 mm (4.8 in)
1942
91.4 mm (3.6 in)
1943
83.7 mm (3.3 in)
1944
74.9 mm (2.9 in)
1945
77.5 mm (3.1 in)
1946
98.4 mm (3.9 in)
1947
49.0 mm (1.9 in)
1948
68.6 mm (2.7 in)
1949
111.3 mm (4.4 in)
1950
188.1 mm (7.4 in)
1951
166.4 mm (6.6 in)
1952
47.3 mm (1.9 in)
1953
60.7 mm (2.4 in)
1954
51.8 mm (2.0 in)
1955
90.1 mm (3.5 in)
1956
121.7 mm (4.8 in)
1957
86.9 mm (3.4 in)
1958
86.6 mm (3.4 in)
1959
75.5 mm (3.0 in)
1960
56.9 mm (2.2 in)
1961
266.3 mm (10.5 in)
1962
83.6 mm (3.3 in)
1963
133.3 mm (5.2 in)
1964
30.4 mm (1.2 in)
1965
102.9 mm (4.1 in)
1966
36.1 mm (1.4 in)
1967
67.3 mm (2.6 in)
1968
91.0 mm (3.6 in)
1969
36.5 mm (1.4 in)
1970
68.8 mm (2.7 in)
1971
64.8 mm (2.6 in)
1972
71.7 mm (2.8 in)
1973
95.3 mm (3.8 in)
1974
118.9 mm (4.7 in)
1975
127.2 mm (5.0 in)
1976
53.1 mm (2.1 in)
1977
83.0 mm (3.3 in)
1978
74.1 mm (2.9 in)
1979
56.7 mm (2.2 in)
1980
111.1 mm (4.4 in)
1981
77.3 mm (3.0 in)
1982
145.3 mm (5.7 in)
1983
49.7 mm (2.0 in)
1984
66.3 mm (2.6 in)
1985
71.1 mm (2.8 in)
1986
90.1 mm (3.5 in)
1987
131.3 mm (5.2 in)
1988
64.3 mm (2.5 in)
1989
98.9 mm (3.9 in)
1990
69.6 mm (2.7 in)
1991
74.1 mm (2.9 in)
1992
73.4 mm (2.9 in)
1993
208.7 mm (8.2 in)
1994
84.4 mm (3.3 in)
1995
67.0 mm (2.6 in)
1996
118.2 mm (4.7 in)
1997
77.7 mm (3.1 in)
1998
86.6 mm (3.4 in)
1999
80.3 mm (3.2 in)
2000
74.0 mm (2.9 in)
2001
106.2 mm (4.2 in)
2002
56.7 mm (2.2 in)
2003
59.9 mm (2.4 in)
2004
81.5 mm (3.2 in)
2005
96.4 mm (3.8 in)
2006
90.4 mm (3.6 in)
2007
157.2 mm (6.2 in)
Longest dry spell (CDD)
The longest dry spell of the year at Alton 1 W, 1902 to 2007. The record is 84 days in 1910, marked on the chart; the median year is 37 days.
Longest dry spell (CDD) at Alton 1 W by year
Year
Longest dry spell (CDD)
1902
17 days
1903
59 days
1904
43 days
1905
36 days
1906
31 days
1907
24 days
1908
36 days
1909
24 days
1910
84 days
1911
43 days
1912
49 days
1913
43 days
1914
70 days
1915
42 days
1916
38 days
1917
43 days
1918
30 days
1919
32 days
1920
38 days
1921
64 days
1922
57 days
1923
40 days
1924
43 days
1925
28 days
1926
36 days
1927
31 days
1928
37 days
1929
40 days
1930
42 days
1931
34 days
1932
25 days
1933
62 days
1934
36 days
1935
43 days
1936
43 days
1937
30 days
1938
55 days
1939
75 days
1940
25 days
1941
20 days
1942
42 days
1943
29 days
1944
51 days
1945
48 days
1946
52 days
1947
30 days
1948
27 days
1949
61 days
1950
42 days
1951
28 days
1952
57 days
1953
28 days
1954
49 days
1955
48 days
1956
67 days
1957
30 days
1958
41 days
1959
57 days
1960
36 days
1961
26 days
1962
29 days
1963
36 days
1964
42 days
1965
55 days
1966
42 days
1967
38 days
1968
45 days
1969
25 days
1970
37 days
1971
30 days
1972
76 days
1973
23 days
1974
34 days
1975
33 days
1976
34 days
1977
32 days
1978
38 days
1979
38 days
1980
39 days
1981
29 days
1982
28 days
1983
18 days
1984
33 days
1985
23 days
1986
33 days
1987
28 days
1988
41 days
1989
48 days
1990
44 days
1991
49 days
1992
21 days
1993
27 days
1994
30 days
1995
37 days
1996
59 days
1997
37 days
1998
31 days
1999
45 days
2000
35 days
2001
22 days
2002
52 days
2003
22 days
2004
25 days
2005
35 days
2006
56 days
2007
20 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
87 years with a frost
Across 87 years with a frost, the median last spring frost at Alton 1 W falls on 28 April and the median first autumn frost on 8 October, which leaves a median of 161 days between them.
In 1969 to 2006 the median growing season was 162 days. That is 2 days fewer than in 1903 to 1940.
Fitted over all years, the growing season changes by -0.4 days per decade at this station.
Frost dates and growing season at Alton 1 W
Measure
Median, all years
Earliest period (1903 to 1940)
Recent period (1969 to 2006)
Recent against earliest
Fitted trend
Last spring frost
28 April
27 April
26 April
1 day earlier
-0.2 days per decade
First autumn frost
8 October
10 October
5 October
5 days earlier
-0.6 days per decade
Growing days
161 days
164 days
162 days
2 days fewer
-0.4 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
95 years, 1903 to 2006
A day with at least 55.7 mm (2.2 in) of rain is expected about once in 2 years. A day with at least 136.5 mm (5.4 in) of rain is expected about once in 100 years.
Rainfall return levels at Alton 1 W: the daily rain expected about once in a given number of years
Expected about once in
A day with at least
Note
2 years
55.7 mm (2.2 in)
5 years
76.3 mm (3.0 in)
10 years
90.4 mm (3.6 in)
25 years
108.6 mm (4.3 in)
50 years
122.5 mm (4.8 in)
100 years
136.5 mm (5.4 in)
Longer than the 95 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, 95 years of values from 1903 to 2006.
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: 156.2 mm (6.1 in) in 1961; 123.7 mm (4.9 in) in 1912; 109.2 mm (4.3 in) in 1974.
Station Changes
No change in the annual mean temperature of this station was found against its neighbours.
Download the Data
Data for Alton 1 W standing records by year: CSV or JSON. Field meanings are on the data page.
Data for Alton 1 W 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.