Record envelope, standing records and threshold days for Waterloo 6SW (USC00119002), Illinois, United States, with 116 years of record.
Key Facts for Waterloo 6SW
Waterloo 6SW (USC00119002) is a weather station in Illinois, United States at 38.27 latitude and -90.23 longitude, 223 m (730 ft) above sea level.
The station reports from 1911 to 2026, 116 years of record.
1,464 records set at Waterloo 6SW still stand.
Records are tracked for tmax, tmin, prcp, snow, snwd: an element needs 30 years of data to be eligible.
Waterloo 6SW set a daily record precipitation of 48.8 mm (1.9 in) on 19 May 2026.
About the Station
Location: Illinois, United States, 38.27 latitude, -90.23 longitude.
Elevation: 223 m (730 ft).
Period of record: 1911 to 2026, 116 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 Waterloo 6SW. 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 Waterloo 6SW, 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)
-26.7 C (-16.1 F)
n/a
n/a
Feb
28.3 C (82.9 F)
-24.4 C (-11.9 F)
n/a
n/a
Mar
31.1 C (88.0 F)
-17.8 C (0.0 F)
n/a
n/a
Apr
33.9 C (93.0 F)
-6.1 C (21.0 F)
n/a
n/a
May
35.0 C (95.0 F)
-1.1 C (30.0 F)
n/a
n/a
Jun
39.4 C (102.9 F)
5.6 C (42.1 F)
n/a
n/a
Jul
41.1 C (106.0 F)
8.3 C (46.9 F)
n/a
n/a
Aug
41.7 C (107.1 F)
7.2 C (45.0 F)
n/a
n/a
Sep
38.9 C (102.0 F)
1.1 C (34.0 F)
n/a
n/a
Oct
34.4 C (93.9 F)
-5.6 C (21.9 F)
n/a
n/a
Nov
31.7 C (89.1 F)
-16.1 C (3.0 F)
n/a
n/a
Dec
23.9 C (75.0 F)
-27.8 C (-18.0 F)
n/a
n/a
Which Years Hold Standing Records
1,464 standing records
Year with most
1,464 records at Waterloo 6SW still stand. 1947 holds the most, with 76.
Standing records at Waterloo 6SW by the year they were set
Year set
Standing records
1945
34
1946
51
1947
76
1948
15
1961
14
1962
38
1963
54
1964
36
1965
44
1966
51
1967
43
1968
30
1969
18
1970
29
1971
43
1972
37
1973
9
1974
46
1975
18
1976
54
1977
27
1978
31
1979
33
1980
38
1981
30
1982
36
1983
52
1984
26
1985
32
1986
34
1987
24
1988
37
1989
41
1990
30
1991
46
1992
27
1993
14
1994
11
1995
19
1996
32
1997
34
1998
28
1999
15
2000
15
2010
8
2011
4
All-Time Record Progression
5 new records
5 all-time records were set at Waterloo 6SW between 20 December 1973 and 22 December 1989. Each dot is a new record.
When Waterloo 6SW set new all-time records
Date
Kind
Detail
1973-12-20
Record daily snowfall
Record daily snowfall 30.5 cm (12.0 in)
1982-01-31
Record daily snowfall
Record daily snowfall 38.1 cm (15.0 in)
1982-02-04
Record snow depth
Record snow depth 43.2 cm (17.0 in)
1982-02-09
Record snow depth
Record snow depth 45.7 cm (18.0 in)
1989-12-22
Record low minimum temperature
Record low minimum temperature -27.8 C (-18.0 F)
Wettest Day of Each Month
Aug: 178.6 mm (7.0 in)
The wettest day on record for each calendar month at Waterloo 6SW. The most was 178.6 mm (7.0 in) on 20 August 1915.
Record daily precipitation for each month at Waterloo 6SW
Month
Record daily precipitation (mm)
Date
Jan
85.1 mm (3.4 in)
12 January 1916
Feb
76.2 mm (3.0 in)
1 February 1988
Mar
96.3 mm (3.8 in)
19 March 2008
Apr
172.5 mm (6.8 in)
29 April 1996
May
95.3 mm (3.8 in)
26 May 2008
Jun
137.4 mm (5.4 in)
11 June 1938
Jul
135.1 mm (5.3 in)
28 July 1979
Aug
178.6 mm (7.0 in)
20 August 1915
Sep
129.0 mm (5.1 in)
18 September 1986
Oct
158.5 mm (6.2 in)
26 October 1919
Nov
151.4 mm (6.0 in)
2 November 1972
Dec
96.5 mm (3.8 in)
10 December 1971
Period of Record Coverage
1945 to 2011
Complete yearUnder 90 percent of days
46 years of record at Waterloo 6SW, 1945 to 2011. 9 years have data for under 90 percent of days and are left out of rankings: 1945, 1946, 1948, 1961, 1993, 1994, 2000, 2010 and others.
Cooler than the station meanWarmer than the station mean
One stripe for each of 37 complete years at Waterloo 6SW, 1946 to 1999. Blue stripes are years cooler than the station's own mean of 13.3 C (56.0 F); red stripes are warmer. The coolest year was 1979, at 11.6 C (52.9 F), and the warmest was 1946, at 16.1 C (61.0 F). The strongest colour marks a difference of 2.8 C (5.0 F).
Annual mean temperature at Waterloo 6SW as warming stripes, 1946 to 1999
Year
Annual mean temperature
Difference from the station mean
1946
16.1 C
+2.78 C
1947
14.8 C
+1.47 C
1962
13.7 C
+0.38 C
1963
13.8 C
+0.45 C
1964
14.0 C
+0.69 C
1965
14.2 C
+0.84 C
1966
13.0 C
-0.40 C
1967
13.3 C
-0.02 C
1968
13.0 C
-0.33 C
1969
12.8 C
-0.58 C
1970
13.5 C
+0.13 C
1971
14.1 C
+0.79 C
1972
13.2 C
-0.15 C
1973
14.0 C
+0.62 C
1974
13.5 C
+0.15 C
1975
13.2 C
-0.18 C
1976
12.2 C
-1.13 C
1977
13.2 C
-0.17 C
1979
11.6 C
-1.73 C
1980
12.9 C
-0.41 C
1981
13.2 C
-0.18 C
1982
12.5 C
-0.84 C
1983
12.9 C
-0.44 C
1984
13.0 C
-0.38 C
1985
12.5 C
-0.87 C
1986
13.8 C
+0.44 C
1987
14.2 C
+0.83 C
1988
13.1 C
-0.25 C
1989
12.6 C
-0.80 C
1990
14.1 C
+0.74 C
1991
13.7 C
+0.37 C
1992
12.7 C
-0.66 C
1995
12.7 C
-0.65 C
1996
12.0 C
-1.31 C
1997
12.4 C
-0.94 C
1998
14.4 C
+1.03 C
1999
14.0 C
+0.61 C
The annual mean temperature here has fallen by 0.3 C (0.1 to 0.5) per decade over 1946 to 1999. In Fahrenheit: 0.5 F (0.2 to 0.9) per decade. The slope is a straight line fitted to 37 complete years; the brackets give its 95 percent interval.
Fitted temperature trends per decade at Waterloo 6SW
Measure
Per decade (C)
Per decade (F)
Period
Complete years
Reading
Annual mean temperature
-0.3 C (-0.5 to -0.1) per decade
-0.5 F (-0.9 to -0.2) per decade
1946 to 1999
37
Fall
Mean daily maximum
-0.3 C (-0.5 to -0.1) per decade
-0.6 F (-1.0 to -0.3) per decade
1946 to 1999
37
Fall
Mean daily minimum
-0.27 C (-0.55 to 0.01) per decade
-0.49 F (-0.99 to 0.02) per decade
1946 to 1999
37
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
1911 to 2026
Yearly extremes at Waterloo 6SW: the record and the median year
Measure
Record
Year of the record
Median year
Years with a value
Hottest day (TXx)
41.7 C (107.1 F)
1962
37.0 C (98.5 F)
46
Coldest night (TNn)
-27.8 C (-18.0 F)
1989
-19.4 C (-3.0 F)
46
Wettest day (Rx1day)
178.6 mm (7.0 in)
1915
64.0 mm (2.5 in)
105
Wettest five days (Rx5day)
230.3 mm (9.1 in)
1919
99.9 mm (3.9 in)
105
Longest dry spell (CDD)
41 days
1979
21 days
105
Hottest day (TXx)
The hottest day of the year at Waterloo 6SW, 1911 to 2026. The record is 41.7 C (107.1 F) in 1962, marked on the chart; the median year is 37.0 C (98.5 F).
Hottest day (TXx) at Waterloo 6SW by year
Year
Hottest day (TXx)
1911
n/a
1912
n/a
1913
n/a
1914
n/a
1915
n/a
1916
n/a
1917
n/a
1918
n/a
1919
n/a
1920
n/a
1921
n/a
1922
n/a
1923
n/a
1924
n/a
1925
n/a
1926
n/a
1927
n/a
1928
n/a
1929
n/a
1930
n/a
1931
n/a
1932
n/a
1933
n/a
1934
n/a
1935
n/a
1936
n/a
1937
n/a
1938
n/a
1939
n/a
1940
n/a
1941
n/a
1942
n/a
1943
n/a
1944
n/a
1945
37.8 C (100.0 F)
1946
36.7 C (98.1 F)
1947
38.9 C (102.0 F)
1948
32.2 C (90.0 F)
1949
n/a
1950
n/a
1951
n/a
1952
n/a
1953
n/a
1954
n/a
1955
n/a
1956
n/a
1957
n/a
1958
n/a
1959
n/a
1960
n/a
1961
34.4 C (93.9 F)
1962
41.7 C (107.1 F)
1963
38.3 C (100.9 F)
1964
40.0 C (104.0 F)
1965
38.3 C (100.9 F)
1966
41.1 C (106.0 F)
1967
34.4 C (93.9 F)
1968
35.6 C (96.1 F)
1969
35.0 C (95.0 F)
1970
38.9 C (102.0 F)
1971
38.9 C (102.0 F)
1972
36.7 C (98.1 F)
1973
35.0 C (95.0 F)
1974
37.2 C (99.0 F)
1975
35.6 C (96.1 F)
1976
38.3 C (100.9 F)
1977
36.1 C (97.0 F)
1978
37.2 C (99.0 F)
1979
35.0 C (95.0 F)
1980
40.6 C (105.1 F)
1981
35.6 C (96.1 F)
1982
36.7 C (98.1 F)
1983
39.4 C (102.9 F)
1984
37.8 C (100.0 F)
1985
35.6 C (96.1 F)
1986
38.9 C (102.0 F)
1987
39.4 C (102.9 F)
1988
39.4 C (102.9 F)
1989
36.7 C (98.1 F)
1990
37.2 C (99.0 F)
1991
37.2 C (99.0 F)
1992
35.0 C (95.0 F)
1993
25.6 C (78.1 F)
1994
36.1 C (97.0 F)
1995
36.7 C (98.1 F)
1996
35.6 C (96.1 F)
1997
36.7 C (98.1 F)
1998
36.1 C (97.0 F)
1999
39.4 C (102.9 F)
2000
37.2 C (99.0 F)
2002
n/a
2003
n/a
2004
n/a
2005
n/a
2006
n/a
2007
n/a
2008
n/a
2009
n/a
2010
37.2 C (99.0 F)
2011
26.7 C (80.1 F)
2022
n/a
2023
n/a
2024
n/a
2025
n/a
2026
n/a
Coldest night (TNn)
The coldest night of the year at Waterloo 6SW, 1911 to 2026. The record is -27.8 C (-18.0 F) in 1989, marked on the chart; the median year is -19.4 C (-3.0 F).
Coldest night (TNn) at Waterloo 6SW by year
Year
Coldest night (TNn)
1911
n/a
1912
n/a
1913
n/a
1914
n/a
1915
n/a
1916
n/a
1917
n/a
1918
n/a
1919
n/a
1920
n/a
1921
n/a
1922
n/a
1923
n/a
1924
n/a
1925
n/a
1926
n/a
1927
n/a
1928
n/a
1929
n/a
1930
n/a
1931
n/a
1932
n/a
1933
n/a
1934
n/a
1935
n/a
1936
n/a
1937
n/a
1938
n/a
1939
n/a
1940
n/a
1941
n/a
1942
n/a
1943
n/a
1944
n/a
1945
-15.0 C (5.0 F)
1946
-12.2 C (10.0 F)
1947
-14.4 C (6.1 F)
1948
-17.8 C (0.0 F)
1949
n/a
1950
n/a
1951
n/a
1952
n/a
1953
n/a
1954
n/a
1955
n/a
1956
n/a
1957
n/a
1958
n/a
1959
n/a
1960
n/a
1961
-15.6 C (3.9 F)
1962
-23.3 C (-9.9 F)
1963
-23.3 C (-9.9 F)
1964
-17.8 C (0.0 F)
1965
-23.3 C (-9.9 F)
1966
-21.7 C (-7.1 F)
1967
-17.8 C (0.0 F)
1968
-23.3 C (-9.9 F)
1969
-17.2 C (1.0 F)
1970
-21.7 C (-7.1 F)
1971
-17.2 C (1.0 F)
1972
-20.6 C (-5.1 F)
1973
-20.6 C (-5.1 F)
1974
-20.6 C (-5.1 F)
1975
-15.6 C (3.9 F)
1976
-22.8 C (-9.0 F)
1977
-26.7 C (-16.1 F)
1978
-20.0 C (-4.0 F)
1979
-24.4 C (-11.9 F)
1980
-18.9 C (-2.0 F)
1981
-21.7 C (-7.1 F)
1982
-26.1 C (-15.0 F)
1983
-25.6 C (-14.1 F)
1984
-21.7 C (-7.1 F)
1985
-26.7 C (-16.1 F)
1986
-18.9 C (-2.0 F)
1987
-15.0 C (5.0 F)
1988
-20.6 C (-5.1 F)
1989
-27.8 C (-18.0 F)
1990
-17.2 C (1.0 F)
1991
-14.4 C (6.1 F)
1992
-15.0 C (5.0 F)
1993
-20.6 C (-5.1 F)
1994
-9.4 C (15.1 F)
1995
-17.8 C (0.0 F)
1996
-24.4 C (-11.9 F)
1997
-20.0 C (-4.0 F)
1998
-14.4 C (6.1 F)
1999
-17.8 C (0.0 F)
2000
-12.8 C (9.0 F)
2002
n/a
2003
n/a
2004
n/a
2005
n/a
2006
n/a
2007
n/a
2008
n/a
2009
n/a
2010
-16.7 C (1.9 F)
2011
-16.7 C (1.9 F)
2022
n/a
2023
n/a
2024
n/a
2025
n/a
2026
n/a
Wettest day (Rx1day)
The wettest day of the year at Waterloo 6SW, 1911 to 2026. The record is 178.6 mm (7.0 in) in 1915, marked on the chart; the median year is 64.0 mm (2.5 in).
Wettest day (Rx1day) at Waterloo 6SW by year
Year
Wettest day (Rx1day)
1911
18.0 mm (0.7 in)
1912
75.2 mm (3.0 in)
1913
56.6 mm (2.2 in)
1914
69.1 mm (2.7 in)
1915
178.6 mm (7.0 in)
1916
85.1 mm (3.4 in)
1917
64.8 mm (2.6 in)
1918
68.1 mm (2.7 in)
1919
158.5 mm (6.2 in)
1920
55.9 mm (2.2 in)
1921
74.2 mm (2.9 in)
1922
51.1 mm (2.0 in)
1923
115.1 mm (4.5 in)
1924
63.0 mm (2.5 in)
1925
89.2 mm (3.5 in)
1926
41.7 mm (1.6 in)
1927
64.0 mm (2.5 in)
1928
70.1 mm (2.8 in)
1929
64.8 mm (2.6 in)
1930
44.5 mm (1.8 in)
1931
69.9 mm (2.8 in)
1932
39.1 mm (1.5 in)
1933
51.1 mm (2.0 in)
1934
43.4 mm (1.7 in)
1935
57.9 mm (2.3 in)
1936
87.4 mm (3.4 in)
1937
45.2 mm (1.8 in)
1938
137.4 mm (5.4 in)
1939
57.4 mm (2.3 in)
1940
46.0 mm (1.8 in)
1941
47.2 mm (1.9 in)
1942
92.2 mm (3.6 in)
1943
50.5 mm (2.0 in)
1944
51.3 mm (2.0 in)
1945
54.1 mm (2.1 in)
1946
59.4 mm (2.3 in)
1947
78.2 mm (3.1 in)
1948
65.0 mm (2.6 in)
1949
95.3 mm (3.8 in)
1950
65.5 mm (2.6 in)
1951
96.5 mm (3.8 in)
1952
35.3 mm (1.4 in)
1953
29.5 mm (1.2 in)
1954
47.0 mm (1.9 in)
1955
54.1 mm (2.1 in)
1956
60.7 mm (2.4 in)
1957
105.9 mm (4.2 in)
1958
73.2 mm (2.9 in)
1959
45.2 mm (1.8 in)
1960
48.3 mm (1.9 in)
1961
94.0 mm (3.7 in)
1962
44.7 mm (1.8 in)
1963
53.6 mm (2.1 in)
1964
62.5 mm (2.5 in)
1965
55.4 mm (2.2 in)
1966
47.5 mm (1.9 in)
1967
54.6 mm (2.1 in)
1968
85.3 mm (3.4 in)
1969
62.5 mm (2.5 in)
1970
58.7 mm (2.3 in)
1971
96.5 mm (3.8 in)
1972
151.4 mm (6.0 in)
1973
88.9 mm (3.5 in)
1974
48.3 mm (1.9 in)
1975
86.4 mm (3.4 in)
1976
45.0 mm (1.8 in)
1977
80.8 mm (3.2 in)
1978
52.8 mm (2.1 in)
1979
135.1 mm (5.3 in)
1980
53.8 mm (2.1 in)
1981
100.6 mm (4.0 in)
1982
87.1 mm (3.4 in)
1983
78.2 mm (3.1 in)
1984
86.4 mm (3.4 in)
1985
88.1 mm (3.5 in)
1986
129.0 mm (5.1 in)
1987
70.6 mm (2.8 in)
1988
76.2 mm (3.0 in)
1989
84.1 mm (3.3 in)
1990
114.3 mm (4.5 in)
1991
75.2 mm (3.0 in)
1992
52.8 mm (2.1 in)
1993
31.0 mm (1.2 in)
1994
52.1 mm (2.1 in)
1995
77.7 mm (3.1 in)
1996
172.5 mm (6.8 in)
1997
54.4 mm (2.1 in)
1998
76.7 mm (3.0 in)
1999
58.2 mm (2.3 in)
2000
118.4 mm (4.7 in)
2002
63.5 mm (2.5 in)
2003
86.4 mm (3.4 in)
2004
44.2 mm (1.7 in)
2005
71.6 mm (2.8 in)
2006
51.6 mm (2.0 in)
2007
36.6 mm (1.4 in)
2008
96.3 mm (3.8 in)
2009
82.6 mm (3.3 in)
2010
36.1 mm (1.4 in)
2011
47.2 mm (1.9 in)
2022
30.2 mm (1.2 in)
2023
49.0 mm (1.9 in)
2024
77.2 mm (3.0 in)
2025
69.9 mm (2.8 in)
2026
48.8 mm (1.9 in)
Wettest five days (Rx5day)
The wettest five days of the year at Waterloo 6SW, 1911 to 2026. The record is 230.3 mm (9.1 in) in 1919, marked on the chart; the median year is 99.9 mm (3.9 in).
Wettest five days (Rx5day) at Waterloo 6SW by year
Year
Wettest five days (Rx5day)
1911
21.9 mm (0.9 in)
1912
85.8 mm (3.4 in)
1913
162.0 mm (6.4 in)
1914
133.9 mm (5.3 in)
1915
214.9 mm (8.5 in)
1916
123.7 mm (4.9 in)
1917
112.8 mm (4.4 in)
1918
106.7 mm (4.2 in)
1919
230.3 mm (9.1 in)
1920
96.9 mm (3.8 in)
1921
114.1 mm (4.5 in)
1922
99.9 mm (3.9 in)
1923
137.2 mm (5.4 in)
1924
85.6 mm (3.4 in)
1925
113.4 mm (4.5 in)
1926
83.9 mm (3.3 in)
1927
128.2 mm (5.0 in)
1928
88.6 mm (3.5 in)
1929
122.7 mm (4.8 in)
1930
83.9 mm (3.3 in)
1931
99.4 mm (3.9 in)
1932
91.1 mm (3.6 in)
1933
90.7 mm (3.6 in)
1934
109.7 mm (4.3 in)
1935
93.8 mm (3.7 in)
1936
92.2 mm (3.6 in)
1937
90.6 mm (3.6 in)
1938
167.1 mm (6.6 in)
1939
81.5 mm (3.2 in)
1940
52.4 mm (2.1 in)
1941
77.2 mm (3.0 in)
1942
130.9 mm (5.2 in)
1943
103.6 mm (4.1 in)
1944
78.0 mm (3.1 in)
1945
113.0 mm (4.4 in)
1946
121.2 mm (4.8 in)
1947
107.2 mm (4.2 in)
1948
66.0 mm (2.6 in)
1949
141.7 mm (5.6 in)
1950
131.9 mm (5.2 in)
1951
116.4 mm (4.6 in)
1952
53.1 mm (2.1 in)
1953
53.1 mm (2.1 in)
1954
84.6 mm (3.3 in)
1955
57.4 mm (2.3 in)
1956
86.9 mm (3.4 in)
1957
115.3 mm (4.5 in)
1958
163.1 mm (6.4 in)
1959
57.0 mm (2.2 in)
1960
66.4 mm (2.6 in)
1961
197.4 mm (7.8 in)
1962
60.3 mm (2.4 in)
1963
81.5 mm (3.2 in)
1964
86.9 mm (3.4 in)
1965
69.1 mm (2.7 in)
1966
64.3 mm (2.5 in)
1967
82.3 mm (3.2 in)
1968
88.4 mm (3.5 in)
1969
103.9 mm (4.1 in)
1970
80.1 mm (3.2 in)
1971
138.0 mm (5.4 in)
1972
190.8 mm (7.5 in)
1973
121.5 mm (4.8 in)
1974
84.7 mm (3.3 in)
1975
110.5 mm (4.4 in)
1976
75.0 mm (3.0 in)
1977
95.8 mm (3.8 in)
1978
100.3 mm (3.9 in)
1979
167.9 mm (6.6 in)
1980
71.1 mm (2.8 in)
1981
100.6 mm (4.0 in)
1982
121.1 mm (4.8 in)
1983
141.0 mm (5.6 in)
1984
116.7 mm (4.6 in)
1985
149.1 mm (5.9 in)
1986
156.0 mm (6.1 in)
1987
96.3 mm (3.8 in)
1988
114.2 mm (4.5 in)
1989
91.7 mm (3.6 in)
1990
119.4 mm (4.7 in)
1991
103.7 mm (4.1 in)
1992
83.3 mm (3.3 in)
1993
49.0 mm (1.9 in)
1994
145.6 mm (5.7 in)
1995
191.5 mm (7.5 in)
1996
197.6 mm (7.8 in)
1997
73.1 mm (2.9 in)
1998
128.3 mm (5.1 in)
1999
80.8 mm (3.2 in)
2000
147.1 mm (5.8 in)
2002
97.3 mm (3.8 in)
2003
103.4 mm (4.1 in)
2004
82.8 mm (3.3 in)
2005
112.2 mm (4.4 in)
2006
98.0 mm (3.9 in)
2007
71.5 mm (2.8 in)
2008
150.1 mm (5.9 in)
2009
116.4 mm (4.6 in)
2010
61.2 mm (2.4 in)
2011
78.0 mm (3.1 in)
2022
45.7 mm (1.8 in)
2023
77.8 mm (3.1 in)
2024
158.8 mm (6.3 in)
2025
107.6 mm (4.2 in)
2026
48.8 mm (1.9 in)
Longest dry spell (CDD)
The longest dry spell of the year at Waterloo 6SW, 1911 to 2026. The record is 41 days in 1979, marked on the chart; the median year is 21 days.
Longest dry spell (CDD) at Waterloo 6SW by year
Year
Longest dry spell (CDD)
1911
11 days
1912
19 days
1913
26 days
1914
36 days
1915
24 days
1916
16 days
1917
26 days
1918
18 days
1919
22 days
1920
20 days
1921
21 days
1922
16 days
1923
13 days
1924
23 days
1925
26 days
1926
20 days
1927
23 days
1928
16 days
1929
21 days
1930
30 days
1931
20 days
1932
14 days
1933
25 days
1934
18 days
1935
17 days
1936
22 days
1937
19 days
1938
24 days
1939
21 days
1940
26 days
1941
22 days
1942
22 days
1943
23 days
1944
28 days
1945
26 days
1946
18 days
1947
24 days
1948
24 days
1949
21 days
1950
29 days
1951
12 days
1952
24 days
1953
22 days
1954
30 days
1955
30 days
1956
27 days
1957
22 days
1958
21 days
1959
20 days
1960
23 days
1961
14 days
1962
16 days
1963
29 days
1964
29 days
1965
27 days
1966
25 days
1967
24 days
1968
35 days
1969
17 days
1970
20 days
1971
20 days
1972
17 days
1973
15 days
1974
21 days
1975
14 days
1976
40 days
1977
18 days
1978
19 days
1979
41 days
1980
23 days
1981
19 days
1982
15 days
1983
27 days
1984
15 days
1985
31 days
1986
18 days
1987
18 days
1988
15 days
1989
21 days
1990
20 days
1991
19 days
1992
19 days
1993
17 days
1994
22 days
1995
27 days
1996
14 days
1997
18 days
1998
13 days
1999
20 days
2000
14 days
2002
25 days
2003
27 days
2004
32 days
2005
21 days
2006
16 days
2007
23 days
2008
15 days
2009
16 days
2010
22 days
2011
15 days
2022
35 days
2023
22 days
2024
26 days
2025
19 days
2026
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
37 years with a frost
Across 37 years with a frost, the median last spring frost at Waterloo 6SW falls on 9 April and the median first autumn frost on 21 October, which leaves a median of 194 days between them.
Fitted over all years, the growing season changes by -2.0 days per decade at this station.
Frost dates and growing season at Waterloo 6SW
Measure
Median, all years
Earliest period
Recent period (1967 to 1999)
Recent against earliest
Fitted trend
Last spring frost
9 April
n/a
9 April
n/a
+1.1 days per decade
First autumn frost
21 October
n/a
20 October
n/a
-1.0 days per decade
Growing days
194 days
n/a
194 days
n/a
-2.0 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, 1912 to 2024
A day with at least 65.8 mm (2.6 in) of rain is expected about once in 2 years. A day with at least 183.4 mm (7.2 in) of rain is expected about once in 100 years.
Rainfall return levels at Waterloo 6SW: the daily rain expected about once in a given number of years
Expected about once in
A day with at least
Note
2 years
65.8 mm (2.6 in)
5 years
90.4 mm (3.6 in)
10 years
109.1 mm (4.3 in)
25 years
136.0 mm (5.4 in)
50 years
158.5 mm (6.2 in)
100 years
183.4 mm (7.2 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 1912 to 2024.
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: 178.6 mm (7.0 in) in 1915; 172.5 mm (6.8 in) in 1996; 158.5 mm (6.2 in) in 1919.
Download the Data
Data for Waterloo 6SW standing records by year: CSV or JSON. Field meanings are on the data page.
Data for Waterloo 6SW 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.