Record envelope, standing records and threshold days for Dubuque River (USW00014934), Iowa, United States, with 80 years of record.
Key Facts for Dubuque River
Dubuque River (USW00014934) is a weather station in Iowa, United States at 42.40 latitude and -90.70 longitude, 177 m (581 ft) above sea level.
The station reports from 1873 to 1952, 80 years of record.
1,464 records set at Dubuque River still stand.
Records are tracked for tmax, tmin, prcp, snow, snwd: an element needs 30 years of data to be eligible.
Dubuque River set a daily record snowfall of 14.5 cm (5.7 in) on 25 December 1951.
About the Station
Location: Iowa, United States, 42.40 latitude, -90.70 longitude.
Elevation: 177 m (581 ft).
Period of record: 1873 to 1952, 80 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 Dubuque River. 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 Dubuque River, with 2026 drawn through them
Month
Highest record high
Lowest record low
2026 highest maximum
2026 lowest minimum
Jan
17.2 C (63.0 F)
-35.0 C (-31.0 F)
n/a
n/a
Feb
20.0 C (68.0 F)
-35.0 C (-31.0 F)
n/a
n/a
Mar
30.0 C (86.0 F)
-24.4 C (-11.9 F)
n/a
n/a
Apr
33.3 C (91.9 F)
-10.0 C (14.0 F)
n/a
n/a
May
40.0 C (104.0 F)
-3.3 C (26.1 F)
n/a
n/a
Jun
40.0 C (104.0 F)
3.3 C (37.9 F)
n/a
n/a
Jul
43.3 C (109.9 F)
4.4 C (39.9 F)
n/a
n/a
Aug
41.7 C (107.1 F)
4.4 C (39.9 F)
n/a
n/a
Sep
37.2 C (99.0 F)
-4.4 C (24.1 F)
n/a
n/a
Oct
31.7 C (89.1 F)
-12.2 C (10.0 F)
n/a
n/a
Nov
25.6 C (78.1 F)
-24.4 C (-11.9 F)
n/a
n/a
Dec
19.4 C (66.9 F)
-30.6 C (-23.1 F)
n/a
n/a
Which Years Hold Standing Records
1,464 standing records
Year with most
1,464 records at Dubuque River still stand. 1936 holds the most, with 39.
Standing records at Dubuque River by the year they were set
Year set
Standing records
1874
17
1875
38
1876
15
1877
29
1878
18
1879
28
1880
29
1881
8
1882
30
1883
15
1884
18
1885
16
1886
25
1887
36
1888
22
1889
23
1890
17
1891
28
1892
11
1893
14
1894
33
1895
23
1896
28
1897
27
1898
8
1899
24
1900
12
1901
24
1902
19
1903
12
1904
11
1905
10
1906
9
1907
19
1908
11
1909
24
1910
15
1911
27
1912
15
1913
20
1914
18
1915
22
1916
22
1917
24
1918
18
1919
8
1920
15
1921
17
1922
9
1923
19
1924
9
1925
25
1926
6
1927
16
1928
21
1929
15
1930
34
1931
27
1932
14
1933
18
1934
28
1935
9
1936
39
1937
8
1938
11
1939
22
1940
13
1941
12
1942
14
1943
15
1944
13
1945
16
1946
19
1947
16
1948
17
1949
11
1950
17
1951
19
All-Time Record Progression
3 new records
3 all-time records were set at Dubuque River between 29 June 1931 and 14 July 1936. Each dot is a new record.
When Dubuque River set new all-time records
Date
Kind
Detail
1931-06-29
Record high minimum temperature
Record high minimum temperature 27.8 C (82.0 F)
1936-07-11
Record high maximum temperature
Record high maximum temperature 41.7 C (107.1 F)
1936-07-14
Record high maximum temperature
Record high maximum temperature 43.3 C (109.9 F)
Wettest Day of Each Month
Sep: 125.7 mm (4.9 in)
The wettest day on record for each calendar month at Dubuque River. The most was 125.7 mm (4.9 in) on 9 September 1875.
Record daily precipitation for each month at Dubuque River
Month
Record daily precipitation (mm)
Date
Jan
65.5 mm (2.6 in)
1 January 1876
Feb
35.3 mm (1.4 in)
27 February 1948
Mar
63.0 mm (2.5 in)
30 March 1933
Apr
66.0 mm (2.6 in)
28 April 1896
May
93.2 mm (3.7 in)
8 May 1927
Jun
93.0 mm (3.7 in)
14 June 1938
Jul
115.6 mm (4.6 in)
5 July 1876
Aug
108.2 mm (4.3 in)
16 August 1918
Sep
125.7 mm (4.9 in)
9 September 1875
Oct
85.6 mm (3.4 in)
4 October 1919
Nov
53.6 mm (2.1 in)
3 November 1935
Dec
36.8 mm (1.4 in)
30 December 1906
Period of Record Coverage
1874 to 1952
Complete yearUnder 90 percent of days
79 years of record at Dubuque River, 1874 to 1952. 2 years have data for under 90 percent of days and are left out of rankings: 1874, 1952.
Cooler than the station meanWarmer than the station mean
One stripe for each of 77 complete years at Dubuque River, 1875 to 1951. Blue stripes are years cooler than the station's own mean of 9.1 C (48.4 F); red stripes are warmer. The coolest year was 1875, at 6.5 C (43.7 F), and the warmest was 1931, at 11.8 C (53.3 F). The strongest colour marks a difference of 2.8 C (5.0 F).
Annual mean temperature at Dubuque River as warming stripes, 1875 to 1951
Year
Annual mean temperature
Difference from the station mean
1875
6.5 C
-2.58 C
1876
8.7 C
-0.43 C
1877
10.0 C
+0.85 C
1878
10.7 C
+1.60 C
1879
9.3 C
+0.24 C
1880
9.7 C
+0.60 C
1881
9.6 C
+0.45 C
1882
9.1 C
-0.03 C
1883
7.5 C
-1.57 C
1884
8.6 C
-0.50 C
1885
7.3 C
-1.76 C
1886
8.5 C
-0.58 C
1887
8.6 C
-0.49 C
1888
7.5 C
-1.57 C
1889
9.3 C
+0.23 C
1890
9.3 C
+0.15 C
1891
9.1 C
+0.02 C
1892
8.1 C
-1.02 C
1893
7.7 C
-1.40 C
1894
10.3 C
+1.20 C
1895
9.2 C
+0.09 C
1896
9.8 C
+0.71 C
1897
8.9 C
-0.20 C
1898
9.0 C
-0.15 C
1899
8.9 C
-0.17 C
1900
9.7 C
+0.56 C
1901
9.3 C
+0.15 C
1902
9.0 C
-0.15 C
1903
8.6 C
-0.54 C
1904
7.9 C
-1.18 C
1905
8.6 C
-0.47 C
1906
9.3 C
+0.19 C
1907
8.5 C
-0.65 C
1908
9.5 C
+0.42 C
1909
8.6 C
-0.50 C
1910
9.3 C
+0.15 C
1911
9.7 C
+0.61 C
1912
7.9 C
-1.19 C
1913
9.9 C
+0.82 C
1914
9.5 C
+0.38 C
1915
8.9 C
-0.17 C
1916
8.8 C
-0.33 C
1917
6.9 C
-2.16 C
1918
9.2 C
+0.11 C
1919
9.2 C
+0.08 C
1920
8.8 C
-0.34 C
1921
11.0 C
+1.94 C
1922
9.9 C
+0.77 C
1923
9.2 C
+0.12 C
1924
7.7 C
-1.36 C
1925
9.0 C
-0.13 C
1926
8.4 C
-0.70 C
1927
9.3 C
+0.15 C
1928
9.4 C
+0.34 C
1929
7.8 C
-1.32 C
1930
9.7 C
+0.58 C
1931
11.8 C
+2.72 C
1932
9.2 C
+0.11 C
1933
10.1 C
+1.00 C
1934
10.5 C
+1.37 C
1935
9.1 C
-0.03 C
1936
8.9 C
-0.20 C
1937
8.7 C
-0.42 C
1938
10.6 C
+1.49 C
1939
10.7 C
+1.57 C
1940
9.0 C
-0.15 C
1941
10.8 C
+1.67 C
1942
9.5 C
+0.42 C
1943
8.8 C
-0.33 C
1944
9.7 C
+0.64 C
1945
8.7 C
-0.36 C
1946
10.6 C
+1.45 C
1947
9.4 C
+0.33 C
1948
9.6 C
+0.51 C
1949
10.0 C
+0.92 C
1950
8.1 C
-0.99 C
1951
7.6 C
-1.47 C
The annual mean temperature here has risen by 0.11 C (0.01 to 0.20) per decade over 1875 to 1951. In Fahrenheit: 0.19 F (0.02 to 0.36) per decade. The slope is a straight line fitted to 77 complete years; the brackets give its 95 percent interval.
Fitted temperature trends per decade at Dubuque River
Measure
Per decade (C)
Per decade (F)
Period
Complete years
Reading
Annual mean temperature
0.11 C (0.01 to 0.20) per decade
0.19 F (0.02 to 0.36) per decade
1875 to 1951
77
Rise
Mean daily maximum
0.07 C (-0.03 to 0.17) per decade
0.1 F (-0.1 to 0.3) per decade
1875 to 1951
77
Not clearly different from zero
Mean daily minimum
0.14 C (0.04 to 0.24) per decade
0.3 F (0.1 to 0.4) per decade
1875 to 1951
77
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
1873 to 1952
Yearly extremes at Dubuque River: 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
36.1 C (97.0 F)
79
Coldest night (TNn)
-35.0 C (-31.0 F)
1875
-27.2 C (-17.0 F)
79
Wettest day (Rx1day)
125.7 mm (4.9 in)
1875
58.8 mm (2.3 in)
80
Wettest five days (Rx5day)
183.5 mm (7.2 in)
1881
87.6 mm (3.4 in)
80
Longest dry spell (CDD)
43 days
1894
22 days
80
Hottest day (TXx)
The hottest day of the year at Dubuque River, 1873 to 1952. The record is 43.3 C (109.9 F) in 1936, marked on the chart; the median year is 36.1 C (97.0 F).
Hottest day (TXx) at Dubuque River by year
Year
Hottest day (TXx)
1873
n/a
1874
38.3 C (100.9 F)
1875
33.3 C (91.9 F)
1876
35.0 C (95.0 F)
1877
35.0 C (95.0 F)
1878
36.1 C (97.0 F)
1879
35.0 C (95.0 F)
1880
36.1 C (97.0 F)
1881
36.1 C (97.0 F)
1882
32.8 C (91.0 F)
1883
35.6 C (96.1 F)
1884
33.9 C (93.0 F)
1885
36.1 C (97.0 F)
1886
37.8 C (100.0 F)
1887
38.3 C (100.9 F)
1888
35.6 C (96.1 F)
1889
35.0 C (95.0 F)
1890
37.2 C (99.0 F)
1891
35.6 C (96.1 F)
1892
35.0 C (95.0 F)
1893
35.6 C (96.1 F)
1894
38.9 C (102.0 F)
1895
36.7 C (98.1 F)
1896
37.2 C (99.0 F)
1897
37.2 C (99.0 F)
1898
35.0 C (95.0 F)
1899
35.6 C (96.1 F)
1900
35.0 C (95.0 F)
1901
41.1 C (106.0 F)
1902
32.2 C (90.0 F)
1903
32.8 C (91.0 F)
1904
34.4 C (93.9 F)
1905
34.4 C (93.9 F)
1906
33.3 C (91.9 F)
1907
33.9 C (93.0 F)
1908
35.6 C (96.1 F)
1909
35.6 C (96.1 F)
1910
36.7 C (98.1 F)
1911
40.0 C (104.0 F)
1912
34.4 C (93.9 F)
1913
37.8 C (100.0 F)
1914
36.1 C (97.0 F)
1915
30.6 C (87.1 F)
1916
37.8 C (100.0 F)
1917
37.2 C (99.0 F)
1918
36.7 C (98.1 F)
1919
35.0 C (95.0 F)
1920
35.0 C (95.0 F)
1921
36.7 C (98.1 F)
1922
37.2 C (99.0 F)
1923
36.1 C (97.0 F)
1924
33.3 C (91.9 F)
1925
36.1 C (97.0 F)
1926
36.1 C (97.0 F)
1927
35.0 C (95.0 F)
1928
33.3 C (91.9 F)
1929
34.4 C (93.9 F)
1930
39.4 C (102.9 F)
1931
39.4 C (102.9 F)
1932
36.1 C (97.0 F)
1933
36.7 C (98.1 F)
1934
40.0 C (104.0 F)
1935
36.7 C (98.1 F)
1936
43.3 C (109.9 F)
1937
37.8 C (100.0 F)
1938
33.9 C (93.0 F)
1939
37.2 C (99.0 F)
1940
38.9 C (102.0 F)
1941
37.8 C (100.0 F)
1942
35.0 C (95.0 F)
1943
35.0 C (95.0 F)
1944
34.4 C (93.9 F)
1945
36.7 C (98.1 F)
1946
36.1 C (97.0 F)
1947
37.2 C (99.0 F)
1948
36.1 C (97.0 F)
1949
36.1 C (97.0 F)
1950
32.8 C (91.0 F)
1951
34.4 C (93.9 F)
1952
10.0 C (50.0 F)
Coldest night (TNn)
The coldest night of the year at Dubuque River, 1873 to 1952. The record is -35.0 C (-31.0 F) in 1875, marked on the chart; the median year is -27.2 C (-17.0 F).
Coldest night (TNn) at Dubuque River by year
Year
Coldest night (TNn)
1873
n/a
1874
-25.6 C (-14.1 F)
1875
-35.0 C (-31.0 F)
1876
-27.8 C (-18.0 F)
1877
-28.3 C (-18.9 F)
1878
-23.3 C (-9.9 F)
1879
-30.0 C (-22.0 F)
1880
-28.3 C (-18.9 F)
1881
-31.1 C (-24.0 F)
1882
-26.7 C (-16.1 F)
1883
-32.2 C (-26.0 F)
1884
-31.1 C (-24.0 F)
1885
-30.0 C (-22.0 F)
1886
-30.6 C (-23.1 F)
1887
-35.0 C (-31.0 F)
1888
-34.4 C (-29.9 F)
1889
-26.7 C (-16.1 F)
1890
-26.7 C (-16.1 F)
1891
-25.0 C (-13.0 F)
1892
-27.8 C (-18.0 F)
1893
-30.6 C (-23.1 F)
1894
-30.0 C (-22.0 F)
1895
-29.4 C (-20.9 F)
1896
-23.3 C (-9.9 F)
1897
-30.6 C (-23.1 F)
1898
-23.3 C (-9.9 F)
1899
-32.2 C (-26.0 F)
1900
-25.0 C (-13.0 F)
1901
-27.2 C (-17.0 F)
1902
-27.8 C (-18.0 F)
1903
-27.2 C (-17.0 F)
1904
-30.6 C (-23.1 F)
1905
-31.7 C (-25.1 F)
1906
-25.6 C (-14.1 F)
1907
-25.6 C (-14.1 F)
1908
-22.2 C (-8.0 F)
1909
-28.3 C (-18.9 F)
1910
-31.7 C (-25.1 F)
1911
-23.9 C (-11.0 F)
1912
-32.2 C (-26.0 F)
1913
-23.3 C (-9.9 F)
1914
-28.9 C (-20.0 F)
1915
-30.0 C (-22.0 F)
1916
-30.0 C (-22.0 F)
1917
-28.9 C (-20.0 F)
1918
-29.4 C (-20.9 F)
1919
-30.6 C (-23.1 F)
1920
-25.6 C (-14.1 F)
1921
-21.7 C (-7.1 F)
1922
-25.6 C (-14.1 F)
1923
-26.7 C (-16.1 F)
1924
-31.1 C (-24.0 F)
1925
-26.1 C (-15.0 F)
1926
-25.0 C (-13.0 F)
1927
-25.6 C (-14.1 F)
1928
-23.3 C (-9.9 F)
1929
-31.1 C (-24.0 F)
1930
-31.1 C (-24.0 F)
1931
-18.9 C (-2.0 F)
1932
-23.9 C (-11.0 F)
1933
-30.6 C (-23.1 F)
1934
-22.2 C (-8.0 F)
1935
-26.7 C (-16.1 F)
1936
-32.2 C (-26.0 F)
1937
-21.1 C (-6.0 F)
1938
-21.7 C (-7.1 F)
1939
-20.6 C (-5.1 F)
1940
-27.8 C (-18.0 F)
1941
-23.3 C (-9.9 F)
1942
-27.2 C (-17.0 F)
1943
-26.7 C (-16.1 F)
1944
-24.4 C (-11.9 F)
1945
-24.4 C (-11.9 F)
1946
-23.9 C (-11.0 F)
1947
-27.2 C (-17.0 F)
1948
-23.3 C (-9.9 F)
1949
-26.7 C (-16.1 F)
1950
-29.4 C (-20.9 F)
1951
-32.2 C (-26.0 F)
1952
-25.6 C (-14.1 F)
Wettest day (Rx1day)
The wettest day of the year at Dubuque River, 1873 to 1952. The record is 125.7 mm (4.9 in) in 1875, marked on the chart; the median year is 58.8 mm (2.3 in).
Wettest day (Rx1day) at Dubuque River by year
Year
Wettest day (Rx1day)
1873
99.6 mm (3.9 in)
1874
84.1 mm (3.3 in)
1875
125.7 mm (4.9 in)
1876
115.6 mm (4.6 in)
1877
71.1 mm (2.8 in)
1878
58.4 mm (2.3 in)
1879
72.4 mm (2.9 in)
1880
85.9 mm (3.4 in)
1881
101.9 mm (4.0 in)
1882
56.4 mm (2.2 in)
1883
58.7 mm (2.3 in)
1884
54.6 mm (2.1 in)
1885
70.6 mm (2.8 in)
1886
52.1 mm (2.1 in)
1887
43.7 mm (1.7 in)
1888
52.6 mm (2.1 in)
1889
54.6 mm (2.1 in)
1890
66.0 mm (2.6 in)
1891
51.3 mm (2.0 in)
1892
88.4 mm (3.5 in)
1893
72.1 mm (2.8 in)
1894
35.6 mm (1.4 in)
1895
46.7 mm (1.8 in)
1896
78.7 mm (3.1 in)
1897
51.3 mm (2.0 in)
1898
52.6 mm (2.1 in)
1899
58.2 mm (2.3 in)
1900
44.2 mm (1.7 in)
1901
47.2 mm (1.9 in)
1902
52.3 mm (2.1 in)
1903
53.3 mm (2.1 in)
1904
30.5 mm (1.2 in)
1905
56.9 mm (2.2 in)
1906
36.8 mm (1.4 in)
1907
64.8 mm (2.6 in)
1908
32.8 mm (1.3 in)
1909
76.7 mm (3.0 in)
1910
46.0 mm (1.8 in)
1911
85.3 mm (3.4 in)
1912
90.2 mm (3.6 in)
1913
52.1 mm (2.1 in)
1914
85.3 mm (3.4 in)
1915
90.7 mm (3.6 in)
1916
51.3 mm (2.0 in)
1917
42.7 mm (1.7 in)
1918
108.2 mm (4.3 in)
1919
98.3 mm (3.9 in)
1920
46.2 mm (1.8 in)
1921
41.4 mm (1.6 in)
1922
37.3 mm (1.5 in)
1923
40.6 mm (1.6 in)
1924
61.7 mm (2.4 in)
1925
87.9 mm (3.5 in)
1926
50.3 mm (2.0 in)
1927
94.5 mm (3.7 in)
1928
71.1 mm (2.8 in)
1929
40.6 mm (1.6 in)
1930
52.8 mm (2.1 in)
1931
42.2 mm (1.7 in)
1932
48.5 mm (1.9 in)
1933
63.0 mm (2.5 in)
1934
78.5 mm (3.1 in)
1935
76.2 mm (3.0 in)
1936
36.1 mm (1.4 in)
1937
58.9 mm (2.3 in)
1938
93.0 mm (3.7 in)
1939
72.9 mm (2.9 in)
1940
60.5 mm (2.4 in)
1941
71.6 mm (2.8 in)
1942
60.5 mm (2.4 in)
1943
70.9 mm (2.8 in)
1944
80.5 mm (3.2 in)
1945
56.6 mm (2.2 in)
1946
67.8 mm (2.7 in)
1947
59.4 mm (2.3 in)
1948
54.4 mm (2.1 in)
1949
69.6 mm (2.7 in)
1950
50.8 mm (2.0 in)
1951
95.8 mm (3.8 in)
1952
7.6 mm (0.30 in)
Wettest five days (Rx5day)
The wettest five days of the year at Dubuque River, 1873 to 1952. The record is 183.5 mm (7.2 in) in 1881, marked on the chart; the median year is 87.6 mm (3.4 in).
Wettest five days (Rx5day) at Dubuque River by year
Year
Wettest five days (Rx5day)
1873
104.4 mm (4.1 in)
1874
119.9 mm (4.7 in)
1875
139.6 mm (5.5 in)
1876
146.1 mm (5.8 in)
1877
76.4 mm (3.0 in)
1878
117.6 mm (4.6 in)
1879
150.1 mm (5.9 in)
1880
113.7 mm (4.5 in)
1881
183.5 mm (7.2 in)
1882
74.5 mm (2.9 in)
1883
94.0 mm (3.7 in)
1884
74.1 mm (2.9 in)
1885
113.3 mm (4.5 in)
1886
75.7 mm (3.0 in)
1887
83.5 mm (3.3 in)
1888
77.9 mm (3.1 in)
1889
75.4 mm (3.0 in)
1890
114.5 mm (4.5 in)
1891
52.3 mm (2.1 in)
1892
149.9 mm (5.9 in)
1893
73.1 mm (2.9 in)
1894
43.9 mm (1.7 in)
1895
60.4 mm (2.4 in)
1896
156.2 mm (6.1 in)
1897
58.2 mm (2.3 in)
1898
73.4 mm (2.9 in)
1899
86.7 mm (3.4 in)
1900
80.7 mm (3.2 in)
1901
56.6 mm (2.2 in)
1902
79.4 mm (3.1 in)
1903
85.9 mm (3.4 in)
1904
51.0 mm (2.0 in)
1905
72.7 mm (2.9 in)
1906
93.8 mm (3.7 in)
1907
75.7 mm (3.0 in)
1908
54.7 mm (2.2 in)
1909
104.7 mm (4.1 in)
1910
61.4 mm (2.4 in)
1911
166.4 mm (6.6 in)
1912
133.2 mm (5.2 in)
1913
69.3 mm (2.7 in)
1914
94.5 mm (3.7 in)
1915
132.4 mm (5.2 in)
1916
96.0 mm (3.8 in)
1917
68.3 mm (2.7 in)
1918
149.2 mm (5.9 in)
1919
128.3 mm (5.1 in)
1920
76.8 mm (3.0 in)
1921
74.7 mm (2.9 in)
1922
73.4 mm (2.9 in)
1923
62.2 mm (2.4 in)
1924
93.2 mm (3.7 in)
1925
124.9 mm (4.9 in)
1926
87.9 mm (3.5 in)
1927
145.3 mm (5.7 in)
1928
123.1 mm (4.8 in)
1929
71.1 mm (2.8 in)
1930
73.9 mm (2.9 in)
1931
90.7 mm (3.6 in)
1932
59.5 mm (2.3 in)
1933
92.5 mm (3.6 in)
1934
98.9 mm (3.9 in)
1935
95.5 mm (3.8 in)
1936
72.6 mm (2.9 in)
1937
68.0 mm (2.7 in)
1938
115.9 mm (4.6 in)
1939
95.8 mm (3.8 in)
1940
71.2 mm (2.8 in)
1941
135.4 mm (5.3 in)
1942
84.6 mm (3.3 in)
1943
98.1 mm (3.9 in)
1944
120.2 mm (4.7 in)
1945
67.8 mm (2.7 in)
1946
129.5 mm (5.1 in)
1947
109.9 mm (4.3 in)
1948
87.2 mm (3.4 in)
1949
123.7 mm (4.9 in)
1950
74.5 mm (2.9 in)
1951
126.3 mm (5.0 in)
1952
15.3 mm (0.6 in)
Longest dry spell (CDD)
The longest dry spell of the year at Dubuque River, 1873 to 1952. The record is 43 days in 1894, marked on the chart; the median year is 22 days.
Longest dry spell (CDD) at Dubuque River by year
Year
Longest dry spell (CDD)
1873
18 days
1874
12 days
1875
16 days
1876
17 days
1877
21 days
1878
14 days
1879
26 days
1880
18 days
1881
13 days
1882
22 days
1883
28 days
1884
21 days
1885
23 days
1886
23 days
1887
16 days
1888
34 days
1889
25 days
1890
15 days
1891
26 days
1892
20 days
1893
32 days
1894
43 days
1895
22 days
1896
22 days
1897
24 days
1898
19 days
1899
24 days
1900
18 days
1901
24 days
1902
22 days
1903
26 days
1904
31 days
1905
21 days
1906
18 days
1907
25 days
1908
30 days
1909
17 days
1910
31 days
1911
27 days
1912
17 days
1913
25 days
1914
21 days
1915
32 days
1916
17 days
1917
27 days
1918
18 days
1919
32 days
1920
21 days
1921
16 days
1922
17 days
1923
17 days
1924
21 days
1925
29 days
1926
24 days
1927
19 days
1928
17 days
1929
24 days
1930
21 days
1931
28 days
1932
23 days
1933
26 days
1934
26 days
1935
16 days
1936
26 days
1937
13 days
1938
25 days
1939
29 days
1940
18 days
1941
18 days
1942
38 days
1943
27 days
1944
26 days
1945
30 days
1946
25 days
1947
27 days
1948
21 days
1949
21 days
1950
31 days
1951
17 days
1952
6 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
77 years with a frost
Across 77 years with a frost, the median last spring frost at Dubuque River falls on 19 April and the median first autumn frost on 17 October, which leaves a median of 183 days between them.
In 1922 to 1951 the median growing season was 186 days. That is 7 days more than in 1875 to 1904.
Fitted over all years, the growing season changes by +1.9 days per decade at this station.
Frost dates and growing season at Dubuque River
Measure
Median, all years
Earliest period (1875 to 1904)
Recent period (1922 to 1951)
Recent against earliest
Fitted trend
Last spring frost
19 April
21 April
19 April
2 days earlier
-0.6 days per decade
First autumn frost
17 October
15 October
18 October
3 days later
+1.4 days per decade
Growing days
183 days
179 days
186 days
7 days more
+1.9 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
78 years, 1874 to 1951
A day with at least 60.8 mm (2.4 in) of rain is expected about once in 2 years. A day with at least 128.9 mm (5.1 in) of rain is expected about once in 100 years.
Rainfall return levels at Dubuque River: the daily rain expected about once in a given number of years
Expected about once in
A day with at least
Note
2 years
60.8 mm (2.4 in)
5 years
79.4 mm (3.1 in)
10 years
91.6 mm (3.6 in)
25 years
106.8 mm (4.2 in)
50 years
117.9 mm (4.6 in)
100 years
128.9 mm (5.1 in)
Longer than the 78 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, 78 years of values from 1874 to 1951.
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: 125.7 mm (4.9 in) in 1875; 115.6 mm (4.6 in) in 1876; 108.2 mm (4.3 in) in 1918.
Station Changes
No change in the annual mean temperature of this station was found against its neighbours.
Download the Data
Data for Dubuque River standing records by year: CSV or JSON. Field meanings are on the data page.
Data for Dubuque River 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.