Record envelope, standing records and threshold days for Onawa 3NW (USC00136243), Iowa, United States, with 113 years of record.
Key Facts for Onawa 3NW
Onawa 3NW (USC00136243) is a weather station in Iowa, United States at 42.07 latitude and -96.13 longitude, 323 m (1,060 ft) above sea level.
The station reports from 1899 to 2011, 113 years of record.
1,464 records set at Onawa 3NW still stand.
Records are tracked for tmax, tmin, prcp, snow, snwd: an element needs 30 years of data to be eligible.
Onawa 3NW set a daily record low minimum temperature of -1.7 C (28.9 F) on 23 September 2011.
About the Station
Location: Iowa, United States, 42.07 latitude, -96.13 longitude.
Elevation: 323 m (1,060 ft).
Period of record: 1899 to 2011, 113 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 Onawa 3NW. 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 Onawa 3NW, with 2026 drawn through them
Month
Highest record high
Lowest record low
2026 highest maximum
2026 lowest minimum
Jan
20.6 C (69.1 F)
-35.6 C (-32.1 F)
n/a
n/a
Feb
21.7 C (71.1 F)
-34.4 C (-29.9 F)
n/a
n/a
Mar
32.8 C (91.0 F)
-30.6 C (-23.1 F)
n/a
n/a
Apr
36.1 C (97.0 F)
-15.6 C (3.9 F)
n/a
n/a
May
41.1 C (106.0 F)
-8.3 C (17.1 F)
n/a
n/a
Jun
41.1 C (106.0 F)
2.2 C (36.0 F)
n/a
n/a
Jul
43.3 C (109.9 F)
5.0 C (41.0 F)
n/a
n/a
Aug
42.2 C (108.0 F)
3.3 C (37.9 F)
n/a
n/a
Sep
40.0 C (104.0 F)
-5.0 C (23.0 F)
n/a
n/a
Oct
36.1 C (97.0 F)
-18.3 C (-0.9 F)
n/a
n/a
Nov
27.8 C (82.0 F)
-26.1 C (-15.0 F)
n/a
n/a
Dec
21.1 C (70.0 F)
-32.8 C (-27.0 F)
n/a
n/a
Which Years Hold Standing Records
1,464 standing records
Year with most
1,464 records at Onawa 3NW still stand. 1936 holds the most, with 55.
Standing records at Onawa 3NW by the year they were set
Year set
Standing records
1899
8
1900
9
1901
6
1902
15
1903
7
1904
7
1905
12
1906
7
1907
13
1908
11
1909
16
1910
13
1911
10
1912
9
1913
19
1914
16
1915
14
1916
14
1917
13
1918
14
1919
12
1920
13
1921
2
1922
2
1923
16
1924
19
1925
13
1926
7
1927
14
1928
15
1929
11
1930
24
1931
10
1932
8
1933
15
1934
42
1935
16
1936
55
1937
22
1938
15
1939
32
1940
8
1941
16
1942
15
1943
10
1944
20
1945
20
1946
16
1947
18
1948
10
1949
6
1950
18
1951
15
1952
12
1953
10
1954
6
1955
26
1956
18
1957
10
1958
11
1959
17
1960
13
1961
6
1962
22
1963
11
1964
12
1965
12
1966
16
1967
19
1968
9
1969
10
1970
15
1971
7
1972
10
1973
6
1974
10
1975
14
1976
10
1977
15
1978
7
1979
4
1980
5
1981
14
1982
6
1983
18
1984
3
1985
13
1986
8
1987
13
1988
4
1989
20
1990
8
1991
20
1992
13
1993
8
1994
6
1995
8
1996
11
1997
17
1998
13
1999
11
2000
22
2001
6
2002
12
2003
12
2004
16
2005
20
2006
13
2007
3
2008
8
2009
6
2010
9
2011
12
All-Time Record Progression
13 new records
13 all-time records were set at Onawa 3NW between 29 May 1934 and 17 July 1996. Each dot is a new record.
When Onawa 3NW set new all-time records
Date
Kind
Detail
1934-05-29
Record high maximum temperature
Record high maximum temperature 40.6 C (105.1 F)
1934-05-30
Record high maximum temperature
Record high maximum temperature 41.1 C (106.0 F)
1934-08-05
Record high maximum temperature
Record high maximum temperature 41.7 C (107.1 F)
1934-08-08
Record high maximum temperature
Record high maximum temperature 42.2 C (108.0 F)
1936-02-03
Record snow depth
Record snow depth 61.0 cm (24.0 in)
1936-02-07
Record snow depth
Record snow depth 63.5 cm (25.0 in)
1936-02-12
Record snow depth
Record snow depth 73.7 cm (29.0 in)
1936-02-15
Record snow depth
Record snow depth 81.3 cm (32.0 in)
1936-02-16
Record snow depth
Record snow depth 83.8 cm (33.0 in)
1936-02-17
Record snow depth
Record snow depth 91.4 cm (36.0 in)
1936-02-21
Record snow depth
Record snow depth 94.0 cm (37.0 in)
1936-07-04
Record high maximum temperature
Record high maximum temperature 43.3 C (109.9 F)
1996-07-17
Record daily precipitation
Record daily precipitation 231.6 mm (9.1 in)
Wettest Day of Each Month
Jul: 231.6 mm (9.1 in)
The wettest day on record for each calendar month at Onawa 3NW. The most was 231.6 mm (9.1 in) on 17 July 1996.
Record daily precipitation for each month at Onawa 3NW
Month
Record daily precipitation (mm)
Date
Jan
36.1 mm (1.4 in)
4 January 1949
Feb
50.3 mm (2.0 in)
28 February 1951
Mar
73.4 mm (2.9 in)
23 March 1987
Apr
81.3 mm (3.2 in)
22 April 1999
May
106.7 mm (4.2 in)
5 May 2007
Jun
123.2 mm (4.9 in)
7 June 1934
Jul
231.6 mm (9.1 in)
17 July 1996
Aug
127.0 mm (5.0 in)
26 August 1903
Sep
177.3 mm (7.0 in)
26 September 1915
Oct
83.1 mm (3.3 in)
30 October 1979
Nov
58.4 mm (2.3 in)
5 November 1905
Dec
38.6 mm (1.5 in)
10 December 1911
Period of Record Coverage
1899 to 2011
Complete yearUnder 90 percent of days
113 years of record at Onawa 3NW, 1899 to 2011. 11 years have data for under 90 percent of days and are left out of rankings: 1899, 1901, 1918, 1920, 1921, 1922, 1926, 1928 and others.
Cooler than the station meanWarmer than the station mean
One stripe for each of 98 complete years at Onawa 3NW, 1900 to 2010. Blue stripes are years cooler than the station's own mean of 9.9 C (49.7 F); red stripes are warmer. The coolest year was 1917, at 7.8 C (46.0 F), and the warmest was 1987, at 11.6 C (52.9 F). The strongest colour marks a difference of 2.1 C (3.8 F).
Annual mean temperature at Onawa 3NW as warming stripes, 1900 to 2010
Year
Annual mean temperature
Difference from the station mean
1900
10.5 C
+0.66 C
1902
9.6 C
-0.24 C
1903
9.5 C
-0.35 C
1904
9.4 C
-0.42 C
1905
9.8 C
-0.11 C
1906
10.1 C
+0.21 C
1907
9.8 C
-0.04 C
1908
11.1 C
+1.24 C
1909
9.7 C
-0.18 C
1910
10.6 C
+0.75 C
1911
10.8 C
+0.96 C
1912
9.3 C
-0.61 C
1913
11.1 C
+1.24 C
1914
10.7 C
+0.81 C
1915
9.3 C
-0.59 C
1916
8.9 C
-1.00 C
1917
7.8 C
-2.09 C
1919
9.5 C
-0.40 C
1923
9.2 C
-0.64 C
1924
7.8 C
-2.07 C
1925
9.6 C
-0.26 C
1927
9.4 C
-0.48 C
1929
8.3 C
-1.59 C
1930
10.5 C
+0.65 C
1931
11.5 C
+1.62 C
1933
10.9 C
+1.07 C
1934
11.5 C
+1.66 C
1935
10.0 C
+0.12 C
1936
9.7 C
-0.19 C
1937
9.0 C
-0.91 C
1938
11.0 C
+1.17 C
1939
11.2 C
+1.37 C
1940
9.4 C
-0.50 C
1941
11.1 C
+1.28 C
1942
9.8 C
-0.07 C
1943
9.7 C
-0.21 C
1944
9.6 C
-0.22 C
1945
9.6 C
-0.28 C
1946
11.1 C
+1.25 C
1947
9.9 C
+0.05 C
1948
10.0 C
+0.10 C
1951
8.1 C
-1.78 C
1952
10.0 C
+0.10 C
1954
11.1 C
+1.23 C
1955
10.4 C
+0.50 C
1956
10.6 C
+0.72 C
1957
10.1 C
+0.26 C
1958
9.9 C
+0.00 C
1959
9.3 C
-0.53 C
1960
8.6 C
-1.22 C
1961
9.2 C
-0.62 C
1962
9.5 C
-0.41 C
1963
10.4 C
+0.52 C
1964
10.4 C
+0.50 C
1965
9.3 C
-0.56 C
1966
8.9 C
-0.98 C
1967
9.1 C
-0.74 C
1968
9.9 C
+0.03 C
1969
9.2 C
-0.66 C
1970
10.0 C
+0.11 C
1971
9.9 C
+0.08 C
1972
9.0 C
-0.83 C
1973
10.5 C
+0.65 C
1974
10.5 C
+0.59 C
1975
9.8 C
-0.03 C
1976
10.6 C
+0.76 C
1977
10.7 C
+0.88 C
1978
8.5 C
-1.32 C
1980
10.3 C
+0.44 C
1981
10.7 C
+0.88 C
1982
8.9 C
-0.96 C
1983
9.4 C
-0.43 C
1984
9.8 C
-0.11 C
1985
9.0 C
-0.88 C
1986
10.6 C
+0.74 C
1987
11.6 C
+1.76 C
1988
10.5 C
+0.66 C
1989
9.5 C
-0.36 C
1990
10.7 C
+0.85 C
1991
10.3 C
+0.45 C
1992
10.0 C
+0.12 C
1993
8.3 C
-1.55 C
1994
9.7 C
-0.18 C
1995
9.7 C
-0.21 C
1996
8.2 C
-1.66 C
1997
9.4 C
-0.42 C
1998
11.4 C
+1.52 C
2000
10.6 C
+0.69 C
2001
10.7 C
+0.80 C
2002
10.7 C
+0.82 C
2003
10.2 C
+0.29 C
2004
10.6 C
+0.76 C
2005
10.2 C
+0.32 C
2006
10.6 C
+0.70 C
2007
9.7 C
-0.21 C
2008
7.8 C
-2.07 C
2009
8.2 C
-1.66 C
2010
8.7 C
-1.12 C
The fitted trend in annual mean temperature here over 1900 to 2010 is -0.01 C (-0.06 to 0.05) per decade. The interval includes zero, so the trend is not clearly different from zero. In Fahrenheit: -0.02 F (-0.12 to 0.08) per decade. The slope is a straight line fitted to 98 complete years; the brackets give its 95 percent interval.
Fitted temperature trends per decade at Onawa 3NW
Measure
Per decade (C)
Per decade (F)
Period
Complete years
Reading
Annual mean temperature
-0.01 C (-0.06 to 0.05) per decade
-0.02 F (-0.12 to 0.08) per decade
1900 to 2010
98
Not clearly different from zero
Mean daily maximum
-0.01 C (-0.08 to 0.06) per decade
-0.01 F (-0.14 to 0.11) per decade
1900 to 2010
98
Not clearly different from zero
Mean daily minimum
-0.01 C (-0.06 to 0.05) per decade
-0.02 F (-0.12 to 0.08) per decade
1900 to 2010
98
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
1899 to 2011
Yearly extremes at Onawa 3NW: the record and the median year
Measure
Record
Year of the record
Median year
Years with a value
Hottest day (TXx)
43.3 C (109.9 F)
1936
37.8 C (100.0 F)
113
Coldest night (TNn)
-35.6 C (-32.1 F)
1912
-27.8 C (-18.0 F)
113
Wettest day (Rx1day)
231.6 mm (9.1 in)
1996
53.3 mm (2.1 in)
113
Wettest five days (Rx5day)
243.1 mm (9.6 in)
1996
80.0 mm (3.1 in)
113
Longest dry spell (CDD)
78 days
1999
27 days
113
Hottest day (TXx)
The hottest day of the year at Onawa 3NW, 1899 to 2011. The record is 43.3 C (109.9 F) in 1936, marked on the chart; the median year is 37.8 C (100.0 F).
Hottest day (TXx) at Onawa 3NW by year
Year
Hottest day (TXx)
1899
38.9 C (102.0 F)
1900
36.1 C (97.0 F)
1901
39.4 C (102.9 F)
1902
34.4 C (93.9 F)
1903
35.6 C (96.1 F)
1904
35.6 C (96.1 F)
1905
36.7 C (98.1 F)
1906
36.1 C (97.0 F)
1907
35.6 C (96.1 F)
1908
35.0 C (95.0 F)
1909
36.1 C (97.0 F)
1910
36.1 C (97.0 F)
1911
40.0 C (104.0 F)
1912
38.3 C (100.9 F)
1913
38.9 C (102.0 F)
1914
38.3 C (100.9 F)
1915
35.6 C (96.1 F)
1916
37.8 C (100.0 F)
1917
38.3 C (100.9 F)
1918
38.9 C (102.0 F)
1919
38.3 C (100.9 F)
1920
37.2 C (99.0 F)
1921
37.2 C (99.0 F)
1922
36.7 C (98.1 F)
1923
36.7 C (98.1 F)
1924
33.9 C (93.0 F)
1925
38.9 C (102.0 F)
1926
38.9 C (102.0 F)
1927
36.7 C (98.1 F)
1928
35.6 C (96.1 F)
1929
35.0 C (95.0 F)
1930
40.0 C (104.0 F)
1931
37.8 C (100.0 F)
1932
38.3 C (100.9 F)
1933
40.0 C (104.0 F)
1934
42.2 C (108.0 F)
1935
39.4 C (102.9 F)
1936
43.3 C (109.9 F)
1937
39.4 C (102.9 F)
1938
40.0 C (104.0 F)
1939
41.1 C (106.0 F)
1940
42.8 C (109.0 F)
1941
39.4 C (102.9 F)
1942
38.9 C (102.0 F)
1943
38.3 C (100.9 F)
1944
38.3 C (100.9 F)
1945
36.1 C (97.0 F)
1946
41.1 C (106.0 F)
1947
40.0 C (104.0 F)
1948
37.8 C (100.0 F)
1949
37.2 C (99.0 F)
1950
35.0 C (95.0 F)
1951
35.6 C (96.1 F)
1952
38.3 C (100.9 F)
1953
40.6 C (105.1 F)
1954
40.0 C (104.0 F)
1955
42.8 C (109.0 F)
1956
38.9 C (102.0 F)
1957
38.9 C (102.0 F)
1958
36.7 C (98.1 F)
1959
35.6 C (96.1 F)
1960
35.6 C (96.1 F)
1961
38.9 C (102.0 F)
1962
35.0 C (95.0 F)
1963
35.6 C (96.1 F)
1964
38.9 C (102.0 F)
1965
36.1 C (97.0 F)
1966
37.8 C (100.0 F)
1967
39.4 C (102.9 F)
1968
36.7 C (98.1 F)
1969
37.2 C (99.0 F)
1970
38.3 C (100.9 F)
1971
38.3 C (100.9 F)
1972
36.7 C (98.1 F)
1973
35.6 C (96.1 F)
1974
40.0 C (104.0 F)
1975
36.7 C (98.1 F)
1976
39.4 C (102.9 F)
1977
37.8 C (100.0 F)
1978
37.2 C (99.0 F)
1979
32.8 C (91.0 F)
1980
38.9 C (102.0 F)
1981
37.2 C (99.0 F)
1982
36.1 C (97.0 F)
1983
40.0 C (104.0 F)
1984
37.8 C (100.0 F)
1985
39.4 C (102.9 F)
1986
35.6 C (96.1 F)
1987
37.2 C (99.0 F)
1988
40.6 C (105.1 F)
1989
38.3 C (100.9 F)
1990
38.9 C (102.0 F)
1991
36.1 C (97.0 F)
1992
32.8 C (91.0 F)
1993
33.9 C (93.0 F)
1994
34.4 C (93.9 F)
1995
40.6 C (105.1 F)
1996
34.4 C (93.9 F)
1997
35.6 C (96.1 F)
1998
36.1 C (97.0 F)
1999
35.6 C (96.1 F)
2000
39.4 C (102.9 F)
2001
36.1 C (97.0 F)
2002
38.9 C (102.0 F)
2003
36.7 C (98.1 F)
2004
34.4 C (93.9 F)
2005
38.3 C (100.9 F)
2006
40.6 C (105.1 F)
2007
36.1 C (97.0 F)
2008
36.7 C (98.1 F)
2009
35.0 C (95.0 F)
2010
36.1 C (97.0 F)
2011
37.8 C (100.0 F)
Coldest night (TNn)
The coldest night of the year at Onawa 3NW, 1899 to 2011. The record is -35.6 C (-32.1 F) in 1912, marked on the chart; the median year is -27.8 C (-18.0 F).
Coldest night (TNn) at Onawa 3NW by year
Year
Coldest night (TNn)
1899
-20.6 C (-5.1 F)
1900
-30.6 C (-23.1 F)
1901
-27.8 C (-18.0 F)
1902
-30.6 C (-23.1 F)
1903
-26.1 C (-15.0 F)
1904
-26.7 C (-16.1 F)
1905
-34.4 C (-29.9 F)
1906
-23.3 C (-9.9 F)
1907
-26.7 C (-16.1 F)
1908
-20.6 C (-5.1 F)
1909
-26.1 C (-15.0 F)
1910
-27.8 C (-18.0 F)
1911
-23.3 C (-9.9 F)
1912
-35.6 C (-32.1 F)
1913
-23.3 C (-9.9 F)
1914
-26.7 C (-16.1 F)
1915
-28.9 C (-20.0 F)
1916
-30.6 C (-23.1 F)
1917
-31.7 C (-25.1 F)
1918
-32.2 C (-26.0 F)
1919
-32.2 C (-26.0 F)
1920
-25.0 C (-13.0 F)
1921
-1.1 C (30.0 F)
1922
-23.9 C (-11.0 F)
1923
-24.4 C (-11.9 F)
1924
-35.0 C (-31.0 F)
1925
-23.9 C (-11.0 F)
1926
-25.6 C (-14.1 F)
1927
-25.6 C (-14.1 F)
1928
-25.6 C (-14.1 F)
1929
-28.3 C (-18.9 F)
1930
-30.0 C (-22.0 F)
1931
-21.1 C (-6.0 F)
1932
-30.6 C (-23.1 F)
1933
-29.4 C (-20.9 F)
1934
-27.2 C (-17.0 F)
1935
-26.1 C (-15.0 F)
1936
-32.2 C (-26.0 F)
1937
-30.6 C (-23.1 F)
1938
-24.4 C (-11.9 F)
1939
-29.4 C (-20.9 F)
1940
-29.4 C (-20.9 F)
1941
-20.6 C (-5.1 F)
1942
-30.6 C (-23.1 F)
1943
-29.4 C (-20.9 F)
1944
-32.8 C (-27.0 F)
1945
-23.3 C (-9.9 F)
1946
-25.6 C (-14.1 F)
1947
-26.1 C (-15.0 F)
1948
-31.7 C (-25.1 F)
1949
-28.3 C (-18.9 F)
1950
-31.1 C (-24.0 F)
1951
-26.7 C (-16.1 F)
1952
-22.8 C (-9.0 F)
1953
-28.3 C (-18.9 F)
1954
-26.1 C (-15.0 F)
1955
-26.7 C (-16.1 F)
1956
-26.7 C (-16.1 F)
1957
-30.6 C (-23.1 F)
1958
-30.6 C (-23.1 F)
1959
-27.8 C (-18.0 F)
1960
-30.6 C (-23.1 F)
1961
-27.2 C (-17.0 F)
1962
-30.6 C (-23.1 F)
1963
-28.9 C (-20.0 F)
1964
-27.2 C (-17.0 F)
1965
-28.9 C (-20.0 F)
1966
-31.1 C (-24.0 F)
1967
-28.3 C (-18.9 F)
1968
-31.1 C (-24.0 F)
1969
-27.2 C (-17.0 F)
1970
-31.7 C (-25.1 F)
1971
-28.3 C (-18.9 F)
1972
-30.6 C (-23.1 F)
1973
-26.1 C (-15.0 F)
1974
-32.2 C (-26.0 F)
1975
-28.3 C (-18.9 F)
1976
-26.7 C (-16.1 F)
1977
-30.0 C (-22.0 F)
1978
-27.8 C (-18.0 F)
1979
-31.1 C (-24.0 F)
1980
-29.4 C (-20.9 F)
1981
-31.1 C (-24.0 F)
1982
-30.0 C (-22.0 F)
1983
-32.2 C (-26.0 F)
1984
-27.8 C (-18.0 F)
1985
-30.0 C (-22.0 F)
1986
-25.6 C (-14.1 F)
1987
-22.8 C (-9.0 F)
1988
-29.4 C (-20.9 F)
1989
-32.8 C (-27.0 F)
1990
-27.2 C (-17.0 F)
1991
-27.2 C (-17.0 F)
1992
-22.8 C (-9.0 F)
1993
-26.1 C (-15.0 F)
1994
-27.2 C (-17.0 F)
1995
-23.9 C (-11.0 F)
1996
-31.1 C (-24.0 F)
1997
-25.6 C (-14.1 F)
1998
-24.4 C (-11.9 F)
1999
-27.8 C (-18.0 F)
2000
-26.1 C (-15.0 F)
2001
-29.4 C (-20.9 F)
2002
-24.4 C (-11.9 F)
2003
-26.1 C (-15.0 F)
2004
-25.0 C (-13.0 F)
2005
-27.2 C (-17.0 F)
2006
-25.6 C (-14.1 F)
2007
-28.9 C (-20.0 F)
2008
-29.4 C (-20.9 F)
2009
-28.3 C (-18.9 F)
2010
-34.4 C (-29.9 F)
2011
-26.7 C (-16.1 F)
Wettest day (Rx1day)
The wettest day of the year at Onawa 3NW, 1899 to 2011. The record is 231.6 mm (9.1 in) in 1996, marked on the chart; the median year is 53.3 mm (2.1 in).
Wettest day (Rx1day) at Onawa 3NW by year
Year
Wettest day (Rx1day)
1899
44.5 mm (1.8 in)
1900
118.1 mm (4.6 in)
1901
34.3 mm (1.4 in)
1902
99.6 mm (3.9 in)
1903
127.0 mm (5.0 in)
1904
71.1 mm (2.8 in)
1905
58.4 mm (2.3 in)
1906
50.3 mm (2.0 in)
1907
18.3 mm (0.7 in)
1908
45.0 mm (1.8 in)
1909
42.7 mm (1.7 in)
1910
21.6 mm (0.9 in)
1911
38.6 mm (1.5 in)
1912
81.3 mm (3.2 in)
1913
44.5 mm (1.8 in)
1914
31.8 mm (1.3 in)
1915
177.3 mm (7.0 in)
1916
41.9 mm (1.6 in)
1917
69.6 mm (2.7 in)
1918
42.7 mm (1.7 in)
1919
43.4 mm (1.7 in)
1920
30.5 mm (1.2 in)
1921
38.1 mm (1.5 in)
1922
80.8 mm (3.2 in)
1923
45.7 mm (1.8 in)
1924
43.2 mm (1.7 in)
1925
53.3 mm (2.1 in)
1926
45.7 mm (1.8 in)
1927
30.5 mm (1.2 in)
1928
63.5 mm (2.5 in)
1929
25.4 mm (1.0 in)
1930
47.0 mm (1.9 in)
1931
49.8 mm (2.0 in)
1932
39.4 mm (1.6 in)
1933
27.4 mm (1.1 in)
1934
123.2 mm (4.9 in)
1935
25.7 mm (1.0 in)
1936
35.8 mm (1.4 in)
1937
52.8 mm (2.1 in)
1938
132.1 mm (5.2 in)
1939
27.9 mm (1.1 in)
1940
43.2 mm (1.7 in)
1941
35.6 mm (1.4 in)
1942
72.1 mm (2.8 in)
1943
20.1 mm (0.8 in)
1944
47.2 mm (1.9 in)
1945
50.8 mm (2.0 in)
1946
49.3 mm (1.9 in)
1947
33.8 mm (1.3 in)
1948
53.3 mm (2.1 in)
1949
59.2 mm (2.3 in)
1950
55.9 mm (2.2 in)
1951
67.6 mm (2.7 in)
1952
74.7 mm (2.9 in)
1953
40.1 mm (1.6 in)
1954
64.0 mm (2.5 in)
1955
61.0 mm (2.4 in)
1956
73.7 mm (2.9 in)
1957
38.9 mm (1.5 in)
1958
98.0 mm (3.9 in)
1959
61.7 mm (2.4 in)
1960
122.7 mm (4.8 in)
1961
61.0 mm (2.4 in)
1962
66.5 mm (2.6 in)
1963
43.2 mm (1.7 in)
1964
43.2 mm (1.7 in)
1965
60.2 mm (2.4 in)
1966
53.8 mm (2.1 in)
1967
65.8 mm (2.6 in)
1968
85.9 mm (3.4 in)
1969
29.2 mm (1.1 in)
1970
50.8 mm (2.0 in)
1971
35.6 mm (1.4 in)
1972
73.7 mm (2.9 in)
1973
51.1 mm (2.0 in)
1974
74.2 mm (2.9 in)
1975
64.8 mm (2.6 in)
1976
51.1 mm (2.0 in)
1977
78.7 mm (3.1 in)
1978
79.8 mm (3.1 in)
1979
83.1 mm (3.3 in)
1980
36.6 mm (1.4 in)
1981
67.6 mm (2.7 in)
1982
65.3 mm (2.6 in)
1983
79.0 mm (3.1 in)
1984
91.2 mm (3.6 in)
1985
32.5 mm (1.3 in)
1986
58.2 mm (2.3 in)
1987
87.6 mm (3.4 in)
1988
89.4 mm (3.5 in)
1989
66.0 mm (2.6 in)
1990
52.1 mm (2.1 in)
1991
47.5 mm (1.9 in)
1992
78.2 mm (3.1 in)
1993
127.5 mm (5.0 in)
1994
57.4 mm (2.3 in)
1995
43.7 mm (1.7 in)
1996
231.6 mm (9.1 in)
1997
34.3 mm (1.4 in)
1998
41.9 mm (1.6 in)
1999
85.1 mm (3.4 in)
2000
78.7 mm (3.1 in)
2001
63.5 mm (2.5 in)
2002
45.7 mm (1.8 in)
2003
38.6 mm (1.5 in)
2004
55.9 mm (2.2 in)
2005
61.0 mm (2.4 in)
2006
58.4 mm (2.3 in)
2007
106.7 mm (4.2 in)
2008
61.0 mm (2.4 in)
2009
114.3 mm (4.5 in)
2010
52.1 mm (2.1 in)
2011
50.8 mm (2.0 in)
Wettest five days (Rx5day)
The wettest five days of the year at Onawa 3NW, 1899 to 2011. The record is 243.1 mm (9.6 in) in 1996, marked on the chart; the median year is 80.0 mm (3.1 in).
Wettest five days (Rx5day) at Onawa 3NW by year
Year
Wettest five days (Rx5day)
1899
66.8 mm (2.6 in)
1900
139.7 mm (5.5 in)
1901
60.3 mm (2.4 in)
1902
177.7 mm (7.0 in)
1903
149.8 mm (5.9 in)
1904
48.0 mm (1.9 in)
1905
79.2 mm (3.1 in)
1906
64.7 mm (2.5 in)
1907
24.9 mm (1.0 in)
1908
69.5 mm (2.7 in)
1909
80.0 mm (3.1 in)
1910
8.8 mm (0.35 in)
1911
38.6 mm (1.5 in)
1912
81.3 mm (3.2 in)
1913
59.2 mm (2.3 in)
1914
31.8 mm (1.3 in)
1915
108.7 mm (4.3 in)
1916
27.4 mm (1.1 in)
1917
95.0 mm (3.7 in)
1918
45.7 mm (1.8 in)
1919
77.5 mm (3.1 in)
1920
26.2 mm (1.0 in)
1921
38.1 mm (1.5 in)
1922
108.2 mm (4.3 in)
1923
55.2 mm (2.2 in)
1924
48.2 mm (1.9 in)
1925
57.5 mm (2.3 in)
1926
45.7 mm (1.8 in)
1927
40.7 mm (1.6 in)
1928
34.5 mm (1.4 in)
1929
46.7 mm (1.8 in)
1930
53.4 mm (2.1 in)
1931
57.7 mm (2.3 in)
1932
38.2 mm (1.5 in)
1933
32.0 mm (1.3 in)
1934
127.0 mm (5.0 in)
1935
23.6 mm (0.9 in)
1936
42.2 mm (1.7 in)
1937
101.5 mm (4.0 in)
1938
28.8 mm (1.1 in)
1939
52.8 mm (2.1 in)
1940
52.2 mm (2.1 in)
1941
46.6 mm (1.8 in)
1942
72.1 mm (2.8 in)
1943
30.7 mm (1.2 in)
1944
73.8 mm (2.9 in)
1945
54.2 mm (2.1 in)
1946
48.1 mm (1.9 in)
1947
66.2 mm (2.6 in)
1948
83.8 mm (3.3 in)
1949
68.3 mm (2.7 in)
1950
71.2 mm (2.8 in)
1951
113.1 mm (4.5 in)
1952
89.3 mm (3.5 in)
1953
65.5 mm (2.6 in)
1954
85.3 mm (3.4 in)
1955
68.9 mm (2.7 in)
1956
91.5 mm (3.6 in)
1957
95.8 mm (3.8 in)
1958
103.1 mm (4.1 in)
1959
99.8 mm (3.9 in)
1960
150.4 mm (5.9 in)
1961
93.8 mm (3.7 in)
1962
101.0 mm (4.0 in)
1963
73.2 mm (2.9 in)
1964
60.2 mm (2.4 in)
1965
126.5 mm (5.0 in)
1966
87.6 mm (3.4 in)
1967
117.7 mm (4.6 in)
1968
136.4 mm (5.4 in)
1969
37.4 mm (1.5 in)
1970
102.7 mm (4.0 in)
1971
71.1 mm (2.8 in)
1972
100.9 mm (4.0 in)
1973
82.2 mm (3.2 in)
1974
103.4 mm (4.1 in)
1975
107.8 mm (4.2 in)
1976
80.0 mm (3.1 in)
1977
88.6 mm (3.5 in)
1978
105.2 mm (4.1 in)
1979
113.6 mm (4.5 in)
1980
53.9 mm (2.1 in)
1981
112.8 mm (4.4 in)
1982
104.9 mm (4.1 in)
1983
96.7 mm (3.8 in)
1984
152.7 mm (6.0 in)
1985
93.3 mm (3.7 in)
1986
98.1 mm (3.9 in)
1987
118.8 mm (4.7 in)
1988
89.4 mm (3.5 in)
1989
112.7 mm (4.4 in)
1990
169.3 mm (6.7 in)
1991
54.4 mm (2.1 in)
1992
145.5 mm (5.7 in)
1993
162.9 mm (6.4 in)
1994
90.6 mm (3.6 in)
1995
86.8 mm (3.4 in)
1996
243.1 mm (9.6 in)
1997
78.2 mm (3.1 in)
1998
74.0 mm (2.9 in)
1999
100.4 mm (4.0 in)
2000
106.1 mm (4.2 in)
2001
158.0 mm (6.2 in)
2002
55.4 mm (2.2 in)
2003
76.1 mm (3.0 in)
2004
71.4 mm (2.8 in)
2005
104.2 mm (4.1 in)
2006
94.4 mm (3.7 in)
2007
161.8 mm (6.4 in)
2008
93.5 mm (3.7 in)
2009
152.9 mm (6.0 in)
2010
109.0 mm (4.3 in)
2011
73.7 mm (2.9 in)
Longest dry spell (CDD)
The longest dry spell of the year at Onawa 3NW, 1899 to 2011. The record is 78 days in 1999, marked on the chart; the median year is 27 days.
Longest dry spell (CDD) at Onawa 3NW by year
Year
Longest dry spell (CDD)
1899
15 days
1900
23 days
1901
27 days
1902
18 days
1903
21 days
1904
30 days
1905
18 days
1906
23 days
1907
25 days
1908
27 days
1909
14 days
1910
45 days
1911
17 days
1912
26 days
1913
26 days
1914
38 days
1915
20 days
1916
19 days
1917
28 days
1918
12 days
1919
27 days
1920
27 days
1921
14 days
1922
41 days
1923
25 days
1924
34 days
1925
27 days
1926
21 days
1927
23 days
1928
27 days
1929
26 days
1930
29 days
1931
44 days
1932
29 days
1933
27 days
1934
41 days
1935
21 days
1936
31 days
1937
28 days
1938
26 days
1939
44 days
1940
25 days
1941
16 days
1942
27 days
1943
35 days
1944
21 days
1945
30 days
1946
29 days
1947
22 days
1948
18 days
1949
49 days
1950
26 days
1951
21 days
1952
56 days
1953
27 days
1954
36 days
1955
28 days
1956
28 days
1957
37 days
1958
31 days
1959
33 days
1960
29 days
1961
31 days
1962
47 days
1963
31 days
1964
23 days
1965
23 days
1966
26 days
1967
62 days
1968
26 days
1969
19 days
1970
25 days
1971
30 days
1972
26 days
1973
21 days
1974
29 days
1975
24 days
1976
41 days
1977
25 days
1978
20 days
1979
36 days
1980
33 days
1981
30 days
1982
19 days
1983
22 days
1984
28 days
1985
20 days
1986
34 days
1987
35 days
1988
40 days
1989
28 days
1990
25 days
1991
21 days
1992
22 days
1993
28 days
1994
28 days
1995
25 days
1996
26 days
1997
24 days
1998
51 days
1999
78 days
2000
23 days
2001
31 days
2002
35 days
2003
57 days
2004
26 days
2005
38 days
2006
28 days
2007
29 days
2008
29 days
2009
24 days
2010
29 days
2011
25 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
98 years with a frost
Across 98 years with a frost, the median last spring frost at Onawa 3NW falls on 1 May and the median first autumn frost on 5 October, which leaves a median of 157 days between them.
In 1980 to 2010 the median growing season was 158 days. The two periods have the same number of growing days.
Fitted over all years, the growing season changes by -0.1 days per decade at this station.
Frost dates and growing season at Onawa 3NW
Measure
Median, all years
Earliest period (1900 to 1937)
Recent period (1980 to 2010)
Recent against earliest
Fitted trend
Last spring frost
1 May
3 May
29 April
4 days earlier
-0.7 days per decade
First autumn frost
5 October
12 October
2 October
10 days earlier
-0.7 days per decade
Growing days
157 days
158 days
158 days
no change
-0.1 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
61 years, 1949 to 2010
A day with at least 60.5 mm (2.4 in) of rain is expected about once in 2 years. A day with at least 170.8 mm (6.7 in) of rain is expected about once in 100 years.
Rainfall return levels at Onawa 3NW: the daily rain expected about once in a given number of years
Expected about once in
A day with at least
Note
2 years
60.5 mm (2.4 in)
5 years
83.4 mm (3.3 in)
10 years
100.9 mm (4.0 in)
25 years
126.1 mm (5.0 in)
50 years
147.4 mm (5.8 in)
100 years
170.8 mm (6.7 in)
Longer than the 61 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, 61 years of values from 1949 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: 231.6 mm (9.1 in) in 1996; 127.5 mm (5.0 in) in 1993; 122.7 mm (4.8 in) in 1960.
Station Changes
1 suspected
One change was suspected in the annual mean temperature of Onawa 3NW, at 1941. Each is measured against neighbouring stations.
Relative to 5 neighbouring stations, the station's annual mean temperature from 1941 ran 0.4 C (0.6 F) higher than in the years before (likely change).
Suspected changes in the annual mean temperature at Onawa 3NW, against neighbouring stations
Year
Shift (C)
Shift (F)
Strength
Neighbours
1941
+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 Onawa 3NW standing records by year: CSV or JSON. Field meanings are on the data page.
Data for Onawa 3NW 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.