Record envelope, standing records and threshold days for Koshkonong (USC00234625), Missouri, United States, with 61 years of record.
Key Facts for Koshkonong
Koshkonong (USC00234625) is a weather station in Missouri, United States at 36.60 latitude and -91.65 longitude, 293 m (961 ft) above sea level.
The station reports from 1900 to 1960, 61 years of record.
1,464 records set at Koshkonong still stand.
Records are tracked for tmax, tmin, prcp, snow, snwd: an element needs 30 years of data to be eligible.
Koshkonong set a daily record low minimum temperature of 11.1 C (52.0 F) on 17 June 1960.
About the Station
Location: Missouri, United States, 36.60 latitude, -91.65 longitude.
Elevation: 293 m (961 ft).
Period of record: 1900 to 1960, 61 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 Koshkonong. 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 Koshkonong, with 2026 drawn through them
Month
Highest record high
Lowest record low
2026 highest maximum
2026 lowest minimum
Jan
25.6 C (78.1 F)
-27.2 C (-17.0 F)
n/a
n/a
Feb
30.0 C (86.0 F)
-26.7 C (-16.1 F)
n/a
n/a
Mar
33.3 C (91.9 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
36.1 C (97.0 F)
0.0 C (32.0 F)
n/a
n/a
Jun
40.6 C (105.1 F)
5.6 C (42.1 F)
n/a
n/a
Jul
43.9 C (111.0 F)
8.9 C (48.0 F)
n/a
n/a
Aug
44.4 C (111.9 F)
5.6 C (42.1 F)
n/a
n/a
Sep
40.6 C (105.1 F)
1.7 C (35.1 F)
n/a
n/a
Oct
37.2 C (99.0 F)
-5.6 C (21.9 F)
n/a
n/a
Nov
30.0 C (86.0 F)
-13.9 C (7.0 F)
n/a
n/a
Dec
27.2 C (81.0 F)
-23.3 C (-9.9 F)
n/a
n/a
Which Years Hold Standing Records
1,464 standing records
Year with most
1,464 records at Koshkonong still stand. 1934 holds the most, with 52.
Standing records at Koshkonong by the year they were set
Year set
Standing records
1900
5
1901
29
1902
27
1903
20
1904
12
1905
23
1906
24
1907
38
1908
22
1909
22
1910
36
1911
49
1912
19
1913
28
1914
33
1915
39
1916
18
1917
39
1918
40
1919
13
1920
21
1921
23
1922
12
1923
24
1924
19
1925
42
1926
20
1927
27
1928
26
1929
25
1930
51
1931
25
1932
29
1933
21
1934
52
1935
12
1936
40
1937
23
1938
17
1939
14
1940
24
1941
14
1942
20
1943
30
1944
14
1945
22
1946
18
1947
26
1948
20
1949
15
1950
36
1951
25
1952
30
1953
22
1954
7
1955
32
1956
14
1957
14
1958
7
1959
6
1960
9
All-Time Record Progression
5 new records
5 all-time records were set at Koshkonong between 10 July 1930 and 9 August 1934. Each dot is a new record.
When Koshkonong set new all-time records
Date
Kind
Detail
1930-07-10
Record high minimum temperature
Record high minimum temperature 28.3 C (82.9 F)
1930-07-11
Record high minimum temperature
Record high minimum temperature 29.4 C (84.9 F)
1930-07-12
Record high minimum temperature
Record high minimum temperature 30.6 C (87.1 F)
1934-07-24
Record high maximum temperature
Record high maximum temperature 43.9 C (111.0 F)
1934-08-09
Record high maximum temperature
Record high maximum temperature 44.4 C (111.9 F)
Wettest Day of Each Month
Aug: 186.4 mm (7.3 in)
The wettest day on record for each calendar month at Koshkonong. The most was 186.4 mm (7.3 in) on 20 August 1915.
Record daily precipitation for each month at Koshkonong
Month
Record daily precipitation (mm)
Date
Jan
113.3 mm (4.5 in)
14 January 1937
Feb
111.5 mm (4.4 in)
26 February 1945
Mar
77.5 mm (3.1 in)
11 March 1935
Apr
121.9 mm (4.8 in)
1 April 1917
May
106.4 mm (4.2 in)
31 May 1942
Jun
133.4 mm (5.3 in)
13 June 1925
Jul
106.7 mm (4.2 in)
12 July 1958
Aug
186.4 mm (7.3 in)
20 August 1915
Sep
134.6 mm (5.3 in)
21 September 1925
Oct
100.1 mm (3.9 in)
23 October 1951
Nov
160.8 mm (6.3 in)
17 November 1958
Dec
143.5 mm (5.6 in)
13 December 1927
Period of Record Coverage
1900 to 1960
Complete yearUnder 90 percent of days
61 years of record at Koshkonong, 1900 to 1960. 4 years have data for under 90 percent of days and are left out of rankings: 1900, 1943, 1951, 1960.
Cooler than the station meanWarmer than the station mean
One stripe for each of 50 complete years at Koshkonong, 1901 to 1959. Blue stripes are years cooler than the station's own mean of 14.7 C (58.5 F); red stripes are warmer. The coolest year was 1903, at 13.4 C (56.0 F), and the warmest was 1921, at 16.6 C (61.9 F). The strongest colour marks a difference of 1.9 C (3.4 F).
Annual mean temperature at Koshkonong as warming stripes, 1901 to 1959
Year
Annual mean temperature
Difference from the station mean
1901
15.0 C
+0.27 C
1902
13.9 C
-0.84 C
1903
13.4 C
-1.38 C
1904
13.6 C
-1.15 C
1905
13.4 C
-1.36 C
1906
13.9 C
-0.89 C
1908
14.8 C
+0.10 C
1909
15.0 C
+0.27 C
1910
14.6 C
-0.11 C
1912
13.9 C
-0.88 C
1913
15.4 C
+0.64 C
1914
15.1 C
+0.40 C
1916
15.1 C
+0.34 C
1917
13.4 C
-1.34 C
1918
14.6 C
-0.14 C
1919
15.0 C
+0.26 C
1920
14.3 C
-0.44 C
1921
16.6 C
+1.85 C
1923
15.0 C
+0.25 C
1924
13.7 C
-1.06 C
1925
15.4 C
+0.65 C
1926
14.8 C
+0.04 C
1927
15.5 C
+0.72 C
1928
14.3 C
-0.44 C
1929
13.9 C
-0.85 C
1930
15.1 C
+0.34 C
1931
15.7 C
+0.97 C
1932
15.4 C
+0.61 C
1933
15.6 C
+0.87 C
1934
15.8 C
+1.06 C
1935
14.3 C
-0.48 C
1936
15.0 C
+0.21 C
1937
13.9 C
-0.84 C
1938
15.9 C
+1.17 C
1939
15.4 C
+0.64 C
1940
13.5 C
-1.27 C
1942
14.5 C
-0.21 C
1944
14.9 C
+0.18 C
1945
14.3 C
-0.48 C
1946
15.1 C
+0.40 C
1947
14.8 C
+0.07 C
1948
14.9 C
+0.12 C
1949
15.2 C
+0.44 C
1950
13.7 C
-1.04 C
1952
15.4 C
+0.68 C
1953
16.0 C
+1.24 C
1955
14.8 C
+0.03 C
1956
15.3 C
+0.60 C
1957
14.7 C
-0.06 C
1959
14.4 C
-0.36 C
The fitted trend in annual mean temperature here over 1901 to 1959 is 0.13 C (0.00 to 0.25) per decade. The interval includes zero, so the trend is not clearly different from zero. In Fahrenheit: 0.23 F (0.00 to 0.45) per decade. The slope is a straight line fitted to 50 complete years; the brackets give its 95 percent interval.
Fitted temperature trends per decade at Koshkonong
Measure
Per decade (C)
Per decade (F)
Period
Complete years
Reading
Annual mean temperature
0.13 C (0.00 to 0.25) per decade
0.23 F (0.00 to 0.45) per decade
1901 to 1959
50
Not clearly different from zero
Mean daily maximum
0.18 C (0.04 to 0.33) per decade
0.3 F (0.1 to 0.6) per decade
1901 to 1959
50
Rise
Mean daily minimum
0.1 C (-0.1 to 0.2) per decade
0.1 F (-0.1 to 0.4) per decade
1901 to 1959
50
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
1900 to 1960
Yearly extremes at Koshkonong: the record and the median year
Measure
Record
Year of the record
Median year
Years with a value
Hottest day (TXx)
44.4 C (111.9 F)
1934
37.8 C (100.0 F)
61
Coldest night (TNn)
-27.2 C (-17.0 F)
1918
-17.8 C (0.0 F)
61
Wettest day (Rx1day)
186.4 mm (7.3 in)
1915
76.2 mm (3.0 in)
61
Wettest five days (Rx5day)
277.7 mm (10.9 in)
1958
118.1 mm (4.6 in)
61
Longest dry spell (CDD)
40 days
1927
21 days
61
Hottest day (TXx)
The hottest day of the year at Koshkonong, 1900 to 1960. The record is 44.4 C (111.9 F) in 1934, marked on the chart; the median year is 37.8 C (100.0 F).
Hottest day (TXx) at Koshkonong by year
Year
Hottest day (TXx)
1900
38.9 C (102.0 F)
1901
43.3 C (109.9 F)
1902
36.7 C (98.1 F)
1903
35.0 C (95.0 F)
1904
33.9 C (93.0 F)
1905
36.1 C (97.0 F)
1906
33.9 C (93.0 F)
1907
38.9 C (102.0 F)
1908
35.6 C (96.1 F)
1909
38.9 C (102.0 F)
1910
34.4 C (93.9 F)
1911
37.2 C (99.0 F)
1912
36.7 C (98.1 F)
1913
39.4 C (102.9 F)
1914
40.0 C (104.0 F)
1915
36.7 C (98.1 F)
1916
39.4 C (102.9 F)
1917
36.7 C (98.1 F)
1918
41.1 C (106.0 F)
1919
37.2 C (99.0 F)
1920
38.3 C (100.9 F)
1921
38.3 C (100.9 F)
1922
39.4 C (102.9 F)
1923
36.7 C (98.1 F)
1924
35.6 C (96.1 F)
1925
40.0 C (104.0 F)
1926
39.4 C (102.9 F)
1927
36.7 C (98.1 F)
1928
35.0 C (95.0 F)
1929
37.8 C (100.0 F)
1930
42.2 C (108.0 F)
1931
38.9 C (102.0 F)
1932
38.3 C (100.9 F)
1933
38.9 C (102.0 F)
1934
44.4 C (111.9 F)
1935
38.3 C (100.9 F)
1936
41.1 C (106.0 F)
1937
36.7 C (98.1 F)
1938
36.7 C (98.1 F)
1939
37.8 C (100.0 F)
1940
35.6 C (96.1 F)
1941
37.2 C (99.0 F)
1942
36.7 C (98.1 F)
1943
41.7 C (107.1 F)
1944
38.3 C (100.9 F)
1945
37.8 C (100.0 F)
1946
38.9 C (102.0 F)
1947
40.6 C (105.1 F)
1948
37.2 C (99.0 F)
1949
34.4 C (93.9 F)
1950
35.0 C (95.0 F)
1951
36.1 C (97.0 F)
1952
38.9 C (102.0 F)
1953
38.9 C (102.0 F)
1954
40.6 C (105.1 F)
1955
37.2 C (99.0 F)
1956
39.4 C (102.9 F)
1957
37.8 C (100.0 F)
1958
36.1 C (97.0 F)
1959
35.6 C (96.1 F)
1960
37.2 C (99.0 F)
Coldest night (TNn)
The coldest night of the year at Koshkonong, 1900 to 1960. The record is -27.2 C (-17.0 F) in 1918, marked on the chart; the median year is -17.8 C (0.0 F).
Coldest night (TNn) at Koshkonong by year
Year
Coldest night (TNn)
1900
-7.8 C (18.0 F)
1901
-22.8 C (-9.0 F)
1902
-15.6 C (3.9 F)
1903
-21.7 C (-7.1 F)
1904
-19.4 C (-2.9 F)
1905
-26.7 C (-16.1 F)
1906
-17.2 C (1.0 F)
1907
-15.0 C (5.0 F)
1908
-15.0 C (5.0 F)
1909
-18.3 C (-0.9 F)
1910
-17.8 C (0.0 F)
1911
-17.8 C (0.0 F)
1912
-20.6 C (-5.1 F)
1913
-13.3 C (8.1 F)
1914
-18.9 C (-2.0 F)
1915
-13.3 C (8.1 F)
1916
-18.9 C (-2.0 F)
1917
-23.3 C (-9.9 F)
1918
-27.2 C (-17.0 F)
1919
-17.8 C (0.0 F)
1920
-13.9 C (7.0 F)
1921
-9.4 C (15.1 F)
1922
-10.6 C (12.9 F)
1923
-15.0 C (5.0 F)
1924
-20.6 C (-5.1 F)
1925
-16.7 C (1.9 F)
1926
-17.2 C (1.0 F)
1927
-17.8 C (0.0 F)
1928
-20.0 C (-4.0 F)
1929
-20.0 C (-4.0 F)
1930
-26.7 C (-16.1 F)
1931
-15.0 C (5.0 F)
1932
-14.4 C (6.1 F)
1933
-21.1 C (-6.0 F)
1934
-17.2 C (1.0 F)
1935
-17.8 C (0.0 F)
1936
-22.8 C (-9.0 F)
1937
-13.3 C (8.1 F)
1938
-13.9 C (7.0 F)
1939
-11.7 C (10.9 F)
1940
-22.8 C (-9.0 F)
1941
-11.7 C (10.9 F)
1942
-22.2 C (-8.0 F)
1943
-18.9 C (-2.0 F)
1944
-14.4 C (6.1 F)
1945
-17.8 C (0.0 F)
1946
-16.1 C (3.0 F)
1947
-18.3 C (-0.9 F)
1948
-17.8 C (0.0 F)
1949
-16.7 C (1.9 F)
1950
-17.8 C (0.0 F)
1951
-23.3 C (-9.9 F)
1952
-12.2 C (10.0 F)
1953
-13.9 C (7.0 F)
1954
-12.8 C (9.0 F)
1955
-17.2 C (1.0 F)
1956
-12.8 C (9.0 F)
1957
-15.6 C (3.9 F)
1958
-18.3 C (-0.9 F)
1959
-17.8 C (0.0 F)
1960
-17.8 C (0.0 F)
Wettest day (Rx1day)
The wettest day of the year at Koshkonong, 1900 to 1960. The record is 186.4 mm (7.3 in) in 1915, marked on the chart; the median year is 76.2 mm (3.0 in).
Wettest day (Rx1day) at Koshkonong by year
Year
Wettest day (Rx1day)
1900
58.7 mm (2.3 in)
1901
58.9 mm (2.3 in)
1902
44.2 mm (1.7 in)
1903
58.4 mm (2.3 in)
1904
83.6 mm (3.3 in)
1905
79.2 mm (3.1 in)
1906
68.3 mm (2.7 in)
1907
80.3 mm (3.2 in)
1908
63.5 mm (2.5 in)
1909
76.2 mm (3.0 in)
1910
105.4 mm (4.1 in)
1911
94.0 mm (3.7 in)
1912
63.5 mm (2.5 in)
1913
76.2 mm (3.0 in)
1914
80.0 mm (3.1 in)
1915
186.4 mm (7.3 in)
1916
62.7 mm (2.5 in)
1917
121.9 mm (4.8 in)
1918
104.6 mm (4.1 in)
1919
64.8 mm (2.6 in)
1920
55.9 mm (2.2 in)
1921
86.4 mm (3.4 in)
1922
50.8 mm (2.0 in)
1923
50.8 mm (2.0 in)
1924
77.2 mm (3.0 in)
1925
134.6 mm (5.3 in)
1926
95.3 mm (3.8 in)
1927
143.5 mm (5.6 in)
1928
71.4 mm (2.8 in)
1929
86.9 mm (3.4 in)
1930
76.2 mm (3.0 in)
1931
47.0 mm (1.9 in)
1932
61.7 mm (2.4 in)
1933
115.1 mm (4.5 in)
1934
48.8 mm (1.9 in)
1935
77.5 mm (3.1 in)
1936
94.0 mm (3.7 in)
1937
113.3 mm (4.5 in)
1938
70.4 mm (2.8 in)
1939
76.7 mm (3.0 in)
1940
66.0 mm (2.6 in)
1941
50.8 mm (2.0 in)
1942
106.4 mm (4.2 in)
1943
104.1 mm (4.1 in)
1944
66.5 mm (2.6 in)
1945
111.5 mm (4.4 in)
1946
70.1 mm (2.8 in)
1947
45.2 mm (1.8 in)
1948
92.5 mm (3.6 in)
1949
72.4 mm (2.9 in)
1950
89.9 mm (3.5 in)
1951
100.1 mm (3.9 in)
1952
111.0 mm (4.4 in)
1953
40.6 mm (1.6 in)
1954
72.6 mm (2.9 in)
1955
54.9 mm (2.2 in)
1956
82.6 mm (3.3 in)
1957
79.5 mm (3.1 in)
1958
160.8 mm (6.3 in)
1959
55.9 mm (2.2 in)
1960
49.5 mm (1.9 in)
Wettest five days (Rx5day)
The wettest five days of the year at Koshkonong, 1900 to 1960. The record is 277.7 mm (10.9 in) in 1958, marked on the chart; the median year is 118.1 mm (4.6 in).
Wettest five days (Rx5day) at Koshkonong by year
Year
Wettest five days (Rx5day)
1900
98.1 mm (3.9 in)
1901
89.1 mm (3.5 in)
1902
86.9 mm (3.4 in)
1903
88.9 mm (3.5 in)
1904
98.5 mm (3.9 in)
1905
125.0 mm (4.9 in)
1906
120.9 mm (4.8 in)
1907
141.7 mm (5.6 in)
1908
104.9 mm (4.1 in)
1909
113.8 mm (4.5 in)
1910
164.4 mm (6.5 in)
1911
131.6 mm (5.2 in)
1912
91.0 mm (3.6 in)
1913
116.3 mm (4.6 in)
1914
127.5 mm (5.0 in)
1915
259.3 mm (10.2 in)
1916
150.8 mm (5.9 in)
1917
121.9 mm (4.8 in)
1918
168.4 mm (6.6 in)
1919
121.7 mm (4.8 in)
1920
98.3 mm (3.9 in)
1921
162.7 mm (6.4 in)
1922
73.7 mm (2.9 in)
1923
92.7 mm (3.6 in)
1924
153.4 mm (6.0 in)
1925
169.7 mm (6.7 in)
1926
125.8 mm (5.0 in)
1927
196.5 mm (7.7 in)
1928
118.9 mm (4.7 in)
1929
89.9 mm (3.5 in)
1930
88.6 mm (3.5 in)
1931
73.9 mm (2.9 in)
1932
85.8 mm (3.4 in)
1933
157.0 mm (6.2 in)
1934
88.2 mm (3.5 in)
1935
119.4 mm (4.7 in)
1936
125.5 mm (4.9 in)
1937
123.2 mm (4.9 in)
1938
133.4 mm (5.3 in)
1939
98.1 mm (3.9 in)
1940
98.6 mm (3.9 in)
1941
105.4 mm (4.1 in)
1942
144.0 mm (5.7 in)
1943
162.5 mm (6.4 in)
1944
82.7 mm (3.3 in)
1945
169.6 mm (6.7 in)
1946
96.3 mm (3.8 in)
1947
66.1 mm (2.6 in)
1948
144.9 mm (5.7 in)
1949
160.3 mm (6.3 in)
1950
146.1 mm (5.8 in)
1951
118.1 mm (4.6 in)
1952
111.0 mm (4.4 in)
1953
59.7 mm (2.4 in)
1954
90.6 mm (3.6 in)
1955
115.0 mm (4.5 in)
1956
96.8 mm (3.8 in)
1957
147.3 mm (5.8 in)
1958
277.7 mm (10.9 in)
1959
72.9 mm (2.9 in)
1960
75.7 mm (3.0 in)
Longest dry spell (CDD)
The longest dry spell of the year at Koshkonong, 1900 to 1960. The record is 40 days in 1927, marked on the chart; the median year is 21 days.
Longest dry spell (CDD) at Koshkonong by year
Year
Longest dry spell (CDD)
1900
27 days
1901
25 days
1902
19 days
1903
17 days
1904
38 days
1905
17 days
1906
24 days
1907
18 days
1908
25 days
1909
16 days
1910
20 days
1911
21 days
1912
25 days
1913
29 days
1914
21 days
1915
22 days
1916
25 days
1917
27 days
1918
20 days
1919
25 days
1920
21 days
1921
27 days
1922
25 days
1923
17 days
1924
25 days
1925
18 days
1926
14 days
1927
40 days
1928
16 days
1929
23 days
1930
39 days
1931
20 days
1932
18 days
1933
28 days
1934
30 days
1935
18 days
1936
28 days
1937
16 days
1938
28 days
1939
21 days
1940
21 days
1941
17 days
1942
22 days
1943
30 days
1944
23 days
1945
24 days
1946
18 days
1947
20 days
1948
21 days
1949
20 days
1950
24 days
1951
15 days
1952
24 days
1953
19 days
1954
28 days
1955
27 days
1956
18 days
1957
21 days
1958
15 days
1959
20 days
1960
14 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
50 years with a frost
Across 50 years with a frost, the median last spring frost at Koshkonong falls on 9 April and the median first autumn frost on 31 October, which leaves a median of 204 days between them.
Fitted over all years, the growing season changes by +1.9 days per decade at this station.
Frost dates and growing season at Koshkonong
Measure
Median, all years
Earliest period
Recent period (1925 to 1959)
Recent against earliest
Fitted trend
Last spring frost
9 April
n/a
5 April
n/a
-1.6 days per decade
First autumn frost
31 October
n/a
1 November
n/a
+0.2 days per decade
Growing days
204 days
n/a
207 days
n/a
+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
56 years, 1901 to 1959
A day with at least 75.1 mm (3.0 in) of rain is expected about once in 2 years. A day with at least 186.0 mm (7.3 in) of rain is expected about once in 100 years.
Rainfall return levels at Koshkonong: the daily rain expected about once in a given number of years
Expected about once in
A day with at least
Note
2 years
75.1 mm (3.0 in)
5 years
100.5 mm (4.0 in)
10 years
118.9 mm (4.7 in)
25 years
144.2 mm (5.7 in)
50 years
164.5 mm (6.5 in)
100 years
186.0 mm (7.3 in)
Longer than the 56 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, 56 years of values from 1901 to 1959.
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: 186.4 mm (7.3 in) in 1915; 160.8 mm (6.3 in) in 1958; 143.5 mm (5.6 in) in 1927.
Station Changes
No change in the annual mean temperature of this station was found against its neighbours.
Download the Data
Data for Koshkonong standing records by year: CSV or JSON. Field meanings are on the data page.
Data for Koshkonong 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 2026-10-15 (15 October 2026). Records are computed by this site and are not official.