Record envelope, standing records and threshold days for Seymour 1 NNW (USC00237674), Missouri, United States, with 65 years of record.
Key Facts for Seymour 1 NNW
Seymour 1 NNW (USC00237674) is a weather station in Missouri, United States at 37.15 latitude and -92.77 longitude, n/a above sea level.
The station reports from 1896 to 1960, 65 years of record.
1,464 records set at Seymour 1 NNW still stand.
Records are tracked for tmax, tmin, prcp, snow: an element needs 30 years of data to be eligible.
Seymour 1 NNW set a daily record precipitation of 41.9 mm (1.6 in) on 23 July 1960.
About the Station
Location: Missouri, United States, 37.15 latitude, -92.77 longitude.
Elevation: n/a.
Period of record: 1896 to 1960, 65 years.
Eligible elements: tmax, tmin, prcp, snow.
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 Seymour 1 NNW. 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 Seymour 1 NNW, 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)
-29.4 C (-20.9 F)
n/a
n/a
Feb
26.1 C (79.0 F)
-32.2 C (-26.0 F)
n/a
n/a
Mar
32.2 C (90.0 F)
-25.6 C (-14.1 F)
n/a
n/a
Apr
31.7 C (89.1 F)
-10.0 C (14.0 F)
n/a
n/a
May
35.0 C (95.0 F)
-2.2 C (28.0 F)
n/a
n/a
Jun
39.4 C (102.9 F)
3.9 C (39.0 F)
n/a
n/a
Jul
44.4 C (111.9 F)
4.4 C (39.9 F)
n/a
n/a
Aug
41.1 C (106.0 F)
6.1 C (43.0 F)
n/a
n/a
Sep
40.0 C (104.0 F)
-1.1 C (30.0 F)
n/a
n/a
Oct
35.6 C (96.1 F)
-11.1 C (12.0 F)
n/a
n/a
Nov
31.1 C (88.0 F)
-17.2 C (1.0 F)
n/a
n/a
Dec
25.0 C (77.0 F)
-26.7 C (-16.1 F)
n/a
n/a
Which Years Hold Standing Records
1,464 standing records
Year with most
1,464 records at Seymour 1 NNW still stand. 1896 holds the most, with 71.
Standing records at Seymour 1 NNW by the year they were set
Year set
Standing records
1896
71
1897
30
1898
19
1899
45
1900
22
1901
41
1902
30
1903
28
1904
21
1905
30
1906
21
1907
25
1920
8
1921
59
1922
39
1923
31
1924
37
1925
49
1926
24
1927
32
1928
28
1929
31
1930
41
1931
28
1932
23
1933
29
1934
48
1935
16
1936
46
1937
24
1938
25
1939
32
1940
39
1941
9
1942
22
1943
21
1944
20
1945
28
1946
26
1947
25
1948
12
1949
12
1950
41
1951
30
1952
37
1953
28
1954
32
1955
20
1956
10
1957
1
1958
3
1959
11
1960
4
All-Time Record Progression
2 new records
2 all-time records were set at Seymour 1 NNW between 12 July 1954 and 14 July 1954. Each dot is a new record.
When Seymour 1 NNW set new all-time records
Date
Kind
Detail
1954-07-12
Record high maximum temperature
Record high maximum temperature 42.8 C (109.0 F)
1954-07-14
Record high maximum temperature
Record high maximum temperature 44.4 C (111.9 F)
Wettest Day of Each Month
Jan: 176.5 mm (6.9 in)
The wettest day on record for each calendar month at Seymour 1 NNW. The most was 176.5 mm (6.9 in) on 2 January 1897.
Record daily precipitation for each month at Seymour 1 NNW
Month
Record daily precipitation (mm)
Date
Jan
176.5 mm (6.9 in)
2 January 1897
Feb
66.0 mm (2.6 in)
23 February 1907
Mar
98.6 mm (3.9 in)
25 March 1904
Apr
100.3 mm (3.9 in)
19 April 1941
May
94.5 mm (3.7 in)
13 May 1933
Jun
111.8 mm (4.4 in)
28 June 1902
Jul
141.7 mm (5.6 in)
20 July 1905
Aug
146.6 mm (5.8 in)
20 August 1920
Sep
134.4 mm (5.3 in)
21 September 1925
Oct
98.3 mm (3.9 in)
30 October 1942
Nov
102.1 mm (4.0 in)
4 November 1938
Dec
68.1 mm (2.7 in)
18 December 1924
Period of Record Coverage
1896 to 1960
Complete yearUnder 90 percent of days
53 years of record at Seymour 1 NNW, 1896 to 1960. 12 years have data for under 90 percent of days and are left out of rankings: 1896, 1907, 1920, 1932, 1948, 1949, 1955, 1956 and others.
Cooler than the station meanWarmer than the station mean
One stripe for each of 35 complete years at Seymour 1 NNW, 1897 to 1951. Blue stripes are years cooler than the station's own mean of 13.0 C (55.3 F); red stripes are warmer. The coolest year was 1951, at 11.5 C (52.6 F), and the warmest was 1921, at 15.2 C (59.3 F). The strongest colour marks a difference of 2.3 C (4.1 F).
Annual mean temperature at Seymour 1 NNW as warming stripes, 1897 to 1951
Year
Annual mean temperature
Difference from the station mean
1897
13.2 C
+0.29 C
1899
12.0 C
-0.92 C
1900
13.2 C
+0.27 C
1901
13.5 C
+0.57 C
1902
12.3 C
-0.62 C
1903
12.0 C
-0.94 C
1904
12.2 C
-0.78 C
1905
12.0 C
-1.00 C
1906
12.1 C
-0.84 C
1921
15.2 C
+2.24 C
1922
14.1 C
+1.15 C
1923
13.1 C
+0.16 C
1925
13.4 C
+0.42 C
1926
12.6 C
-0.36 C
1927
13.3 C
+0.30 C
1928
12.7 C
-0.24 C
1929
12.4 C
-0.51 C
1930
12.9 C
-0.03 C
1931
14.3 C
+1.30 C
1933
14.0 C
+1.01 C
1934
13.7 C
+0.76 C
1935
12.6 C
-0.39 C
1936
13.5 C
+0.50 C
1938
14.4 C
+1.45 C
1939
13.9 C
+0.91 C
1940
12.0 C
-0.98 C
1941
13.5 C
+0.57 C
1942
12.9 C
-0.07 C
1943
13.0 C
+0.03 C
1944
13.2 C
+0.20 C
1945
11.7 C
-1.27 C
1946
13.4 C
+0.44 C
1947
12.0 C
-0.98 C
1950
11.8 C
-1.13 C
1951
11.5 C
-1.50 C
The fitted trend in annual mean temperature here over 1897 to 1951 is 0.02 C (-0.17 to 0.20) per decade. The interval includes zero, so the trend is not clearly different from zero. In Fahrenheit: 0.03 F (-0.30 to 0.36) per decade. The slope is a straight line fitted to 35 complete years; the brackets give its 95 percent interval.
Fitted temperature trends per decade at Seymour 1 NNW
Measure
Per decade (C)
Per decade (F)
Period
Complete years
Reading
Annual mean temperature
0.02 C (-0.17 to 0.20) per decade
0.03 F (-0.30 to 0.36) per decade
1897 to 1951
35
Not clearly different from zero
Mean daily maximum
0.1 C (-0.1 to 0.3) per decade
0.1 F (-0.2 to 0.5) per decade
1897 to 1951
35
Not clearly different from zero
Mean daily minimum
-0.05 C (-0.25 to 0.15) per decade
-0.1 F (-0.4 to 0.3) per decade
1897 to 1951
35
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
1896 to 1960
Yearly extremes at Seymour 1 NNW: 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)
1954
36.1 C (97.0 F)
53
Coldest night (TNn)
-32.2 C (-26.0 F)
1899
-18.9 C (-2.0 F)
53
Wettest day (Rx1day)
176.5 mm (6.9 in)
1897
68.8 mm (2.7 in)
53
Wettest five days (Rx5day)
189.7 mm (7.5 in)
1945
108.2 mm (4.3 in)
53
Longest dry spell (CDD)
38 days
1897
21 days
53
Hottest day (TXx)
The hottest day of the year at Seymour 1 NNW, 1896 to 1960. The record is 44.4 C (111.9 F) in 1954, marked on the chart; the median year is 36.1 C (97.0 F).
Hottest day (TXx) at Seymour 1 NNW by year
Year
Hottest day (TXx)
1896
37.8 C (100.0 F)
1897
38.9 C (102.0 F)
1898
32.8 C (91.0 F)
1899
37.8 C (100.0 F)
1900
37.8 C (100.0 F)
1901
41.7 C (107.1 F)
1902
35.0 C (95.0 F)
1903
33.3 C (91.9 F)
1904
34.4 C (93.9 F)
1905
33.3 C (91.9 F)
1906
31.7 C (89.1 F)
1907
31.1 C (88.0 F)
1920
31.7 C (89.1 F)
1921
36.1 C (97.0 F)
1922
38.9 C (102.0 F)
1923
35.6 C (96.1 F)
1924
33.3 C (91.9 F)
1925
37.2 C (99.0 F)
1926
37.8 C (100.0 F)
1927
33.3 C (91.9 F)
1928
33.3 C (91.9 F)
1929
36.7 C (98.1 F)
1930
40.6 C (105.1 F)
1931
36.7 C (98.1 F)
1932
34.4 C (93.9 F)
1933
37.2 C (99.0 F)
1934
42.2 C (108.0 F)
1935
37.2 C (99.0 F)
1936
40.6 C (105.1 F)
1937
36.1 C (97.0 F)
1938
38.3 C (100.9 F)
1939
37.8 C (100.0 F)
1940
35.0 C (95.0 F)
1941
36.1 C (97.0 F)
1942
35.0 C (95.0 F)
1943
37.2 C (99.0 F)
1944
36.1 C (97.0 F)
1945
35.6 C (96.1 F)
1946
39.4 C (102.9 F)
1947
38.3 C (100.9 F)
1948
32.2 C (90.0 F)
1949
31.7 C (89.1 F)
1950
32.8 C (91.0 F)
1951
36.7 C (98.1 F)
1952
39.4 C (102.9 F)
1953
39.4 C (102.9 F)
1954
44.4 C (111.9 F)
1955
38.9 C (102.0 F)
1956
30.6 C (87.1 F)
1957
31.7 C (89.1 F)
1958
33.3 C (91.9 F)
1959
33.3 C (91.9 F)
1960
36.7 C (98.1 F)
Coldest night (TNn)
The coldest night of the year at Seymour 1 NNW, 1896 to 1960. The record is -32.2 C (-26.0 F) in 1899, marked on the chart; the median year is -18.9 C (-2.0 F).
Coldest night (TNn) at Seymour 1 NNW by year
Year
Coldest night (TNn)
1896
-16.1 C (3.0 F)
1897
-20.6 C (-5.1 F)
1898
-18.3 C (-0.9 F)
1899
-32.2 C (-26.0 F)
1900
-23.3 C (-9.9 F)
1901
-25.0 C (-13.0 F)
1902
-23.9 C (-11.0 F)
1903
-22.2 C (-8.0 F)
1904
-23.3 C (-9.9 F)
1905
-30.6 C (-23.1 F)
1906
-20.6 C (-5.1 F)
1907
-17.2 C (1.0 F)
1920
-13.9 C (7.0 F)
1921
-12.2 C (10.0 F)
1922
-16.1 C (3.0 F)
1923
-17.8 C (0.0 F)
1924
-26.7 C (-16.1 F)
1925
-18.9 C (-2.0 F)
1926
-26.1 C (-15.0 F)
1927
-19.4 C (-2.9 F)
1928
-23.3 C (-9.9 F)
1929
-30.6 C (-23.1 F)
1930
-29.4 C (-20.9 F)
1931
-15.6 C (3.9 F)
1932
-15.6 C (3.9 F)
1933
-23.9 C (-11.0 F)
1934
-22.8 C (-9.0 F)
1935
-18.9 C (-2.0 F)
1936
-22.8 C (-9.0 F)
1937
-17.2 C (1.0 F)
1938
-16.7 C (1.9 F)
1939
-16.7 C (1.9 F)
1940
-25.0 C (-13.0 F)
1941
-12.8 C (9.0 F)
1942
-22.8 C (-9.0 F)
1943
-25.6 C (-14.1 F)
1944
-20.0 C (-4.0 F)
1945
-19.4 C (-2.9 F)
1946
-15.6 C (3.9 F)
1947
-18.9 C (-2.0 F)
1948
-21.7 C (-7.1 F)
1949
-16.7 C (1.9 F)
1950
-17.2 C (1.0 F)
1951
-25.6 C (-14.1 F)
1952
-14.4 C (6.1 F)
1953
-16.1 C (3.0 F)
1954
-16.7 C (1.9 F)
1955
-18.9 C (-2.0 F)
1956
-16.7 C (1.9 F)
1957
-8.9 C (16.0 F)
1958
-18.3 C (-0.9 F)
1959
-16.1 C (3.0 F)
1960
-15.0 C (5.0 F)
Wettest day (Rx1day)
The wettest day of the year at Seymour 1 NNW, 1896 to 1960. The record is 176.5 mm (6.9 in) in 1897, marked on the chart; the median year is 68.8 mm (2.7 in).
Wettest day (Rx1day) at Seymour 1 NNW by year
Year
Wettest day (Rx1day)
1896
49.5 mm (1.9 in)
1897
176.5 mm (6.9 in)
1898
56.6 mm (2.2 in)
1899
44.7 mm (1.8 in)
1900
97.5 mm (3.8 in)
1901
52.1 mm (2.1 in)
1902
111.8 mm (4.4 in)
1903
95.3 mm (3.8 in)
1904
98.6 mm (3.9 in)
1905
141.7 mm (5.6 in)
1906
84.3 mm (3.3 in)
1907
66.0 mm (2.6 in)
1920
146.6 mm (5.8 in)
1921
50.8 mm (2.0 in)
1922
30.5 mm (1.2 in)
1923
78.2 mm (3.1 in)
1924
68.1 mm (2.7 in)
1925
134.4 mm (5.3 in)
1926
68.8 mm (2.7 in)
1927
60.5 mm (2.4 in)
1928
96.0 mm (3.8 in)
1929
62.7 mm (2.5 in)
1930
45.2 mm (1.8 in)
1931
106.7 mm (4.2 in)
1932
96.3 mm (3.8 in)
1933
94.5 mm (3.7 in)
1934
66.0 mm (2.6 in)
1935
74.4 mm (2.9 in)
1936
49.5 mm (1.9 in)
1937
63.5 mm (2.5 in)
1938
102.1 mm (4.0 in)
1939
74.9 mm (2.9 in)
1940
61.0 mm (2.4 in)
1941
100.3 mm (3.9 in)
1942
98.3 mm (3.9 in)
1943
72.4 mm (2.9 in)
1944
62.2 mm (2.4 in)
1945
63.2 mm (2.5 in)
1946
63.0 mm (2.5 in)
1947
59.7 mm (2.4 in)
1948
77.5 mm (3.1 in)
1949
70.4 mm (2.8 in)
1950
80.8 mm (3.2 in)
1951
52.8 mm (2.1 in)
1952
64.8 mm (2.6 in)
1953
88.6 mm (3.5 in)
1954
61.5 mm (2.4 in)
1955
56.4 mm (2.2 in)
1956
49.3 mm (1.9 in)
1957
72.1 mm (2.8 in)
1958
67.3 mm (2.6 in)
1959
73.7 mm (2.9 in)
1960
49.5 mm (1.9 in)
Wettest five days (Rx5day)
The wettest five days of the year at Seymour 1 NNW, 1896 to 1960. The record is 189.7 mm (7.5 in) in 1945, marked on the chart; the median year is 108.2 mm (4.3 in).
Wettest five days (Rx5day) at Seymour 1 NNW by year
Year
Wettest five days (Rx5day)
1896
146.0 mm (5.7 in)
1897
83.3 mm (3.3 in)
1898
113.3 mm (4.5 in)
1899
83.5 mm (3.3 in)
1900
161.2 mm (6.3 in)
1901
58.5 mm (2.3 in)
1902
126.8 mm (5.0 in)
1903
142.1 mm (5.6 in)
1904
118.2 mm (4.7 in)
1905
142.8 mm (5.6 in)
1906
122.9 mm (4.8 in)
1907
103.0 mm (4.1 in)
1920
150.2 mm (5.9 in)
1921
102.0 mm (4.0 in)
1922
61.8 mm (2.4 in)
1923
108.2 mm (4.3 in)
1924
103.6 mm (4.1 in)
1925
187.2 mm (7.4 in)
1926
98.0 mm (3.9 in)
1927
119.0 mm (4.7 in)
1928
158.2 mm (6.2 in)
1929
78.2 mm (3.1 in)
1930
100.7 mm (4.0 in)
1931
153.2 mm (6.0 in)
1932
112.0 mm (4.4 in)
1933
184.1 mm (7.2 in)
1934
80.7 mm (3.2 in)
1935
137.4 mm (5.4 in)
1936
54.7 mm (2.2 in)
1937
82.8 mm (3.3 in)
1938
165.1 mm (6.5 in)
1939
87.1 mm (3.4 in)
1940
116.4 mm (4.6 in)
1941
184.9 mm (7.3 in)
1942
127.2 mm (5.0 in)
1943
173.0 mm (6.8 in)
1944
68.0 mm (2.7 in)
1945
189.7 mm (7.5 in)
1946
152.1 mm (6.0 in)
1947
96.5 mm (3.8 in)
1948
100.4 mm (4.0 in)
1949
113.3 mm (4.5 in)
1950
142.3 mm (5.6 in)
1951
88.3 mm (3.5 in)
1952
82.6 mm (3.3 in)
1953
97.7 mm (3.8 in)
1954
74.5 mm (2.9 in)
1955
72.7 mm (2.9 in)
1956
49.3 mm (1.9 in)
1957
139.7 mm (5.5 in)
1958
107.4 mm (4.2 in)
1959
74.1 mm (2.9 in)
1960
94.7 mm (3.7 in)
Longest dry spell (CDD)
The longest dry spell of the year at Seymour 1 NNW, 1896 to 1960. The record is 38 days in 1897, marked on the chart; the median year is 21 days.
Longest dry spell (CDD) at Seymour 1 NNW by year
Year
Longest dry spell (CDD)
1896
21 days
1897
38 days
1898
19 days
1899
22 days
1900
24 days
1901
20 days
1902
19 days
1903
19 days
1904
21 days
1905
17 days
1906
31 days
1907
35 days
1920
21 days
1921
20 days
1922
19 days
1923
17 days
1924
25 days
1925
24 days
1926
20 days
1927
21 days
1928
38 days
1929
24 days
1930
23 days
1931
16 days
1932
30 days
1933
29 days
1934
32 days
1935
22 days
1936
29 days
1937
15 days
1938
23 days
1939
21 days
1940
23 days
1941
24 days
1942
22 days
1943
28 days
1944
17 days
1945
21 days
1946
18 days
1947
20 days
1948
19 days
1949
20 days
1950
30 days
1951
16 days
1952
33 days
1953
27 days
1954
27 days
1955
23 days
1956
21 days
1957
8 days
1958
16 days
1959
36 days
1960
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
35 years with a frost
Across 35 years with a frost, the median last spring frost at Seymour 1 NNW falls on 22 April and the median first autumn frost on 16 October, which leaves a median of 172 days between them.
Fitted over all years, the growing season changes by -0.9 days per decade at this station.
Frost dates and growing season at Seymour 1 NNW
Measure
Median, all years
Earliest period
Recent period (1903 to 1951)
Recent against earliest
Fitted trend
Last spring frost
22 April
n/a
26 April
n/a
+1.1 days per decade
First autumn frost
16 October
n/a
17 October
n/a
+0.2 days per decade
Growing days
172 days
n/a
171 days
n/a
-0.9 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
39 years, 1897 to 1954
A day with at least 73.9 mm (2.9 in) of rain is expected about once in 2 years. A day with at least 179.8 mm (7.1 in) of rain is expected about once in 100 years.
Rainfall return levels at Seymour 1 NNW: the daily rain expected about once in a given number of years
Expected about once in
A day with at least
Note
2 years
73.9 mm (2.9 in)
5 years
98.8 mm (3.9 in)
10 years
116.6 mm (4.6 in)
25 years
140.7 mm (5.5 in)
50 years
159.8 mm (6.3 in)
Longer than the 39 years of record
100 years
179.8 mm (7.1 in)
Longer than the 39 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, 39 years of values from 1897 to 1954.
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: 176.5 mm (6.9 in) in 1897; 141.7 mm (5.6 in) in 1905; 134.4 mm (5.3 in) in 1925.
Download the Data
Data for Seymour 1 NNW standing records by year: CSV or JSON. Field meanings are on the data page.
Data for Seymour 1 NNW 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.