Record envelope, standing records and threshold days for Decatur 1 N (USC00402385), Tennessee, United States, with 62 years of record.
Key Facts for Decatur 1 N
Decatur 1 N (USC00402385) is a weather station in Tennessee, United States at 35.53 latitude and -84.78 longitude, 268 m (879 ft) above sea level.
The station reports from 1895 to 1956, 62 years of record.
1,464 records set at Decatur 1 N still stand.
Records are tracked for tmax, tmin, prcp: an element needs 30 years of data to be eligible.
Decatur 1 N set a daily record low minimum temperature of 8.3 C (46.9 F) on 24 August 1956.
About the Station
Location: Tennessee, United States, 35.53 latitude, -84.78 longitude.
Elevation: 268 m (879 ft).
Period of record: 1895 to 1956, 62 years.
Eligible elements: tmax, tmin, prcp.
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 Decatur 1 N. 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 Decatur 1 N, with 2026 drawn through them
Month
Highest record high
Lowest record low
2026 highest maximum
2026 lowest minimum
Jan
25.0 C (77.0 F)
-28.3 C (-18.9 F)
n/a
n/a
Feb
25.6 C (78.1 F)
-28.9 C (-20.0 F)
n/a
n/a
Mar
32.8 C (91.0 F)
-16.7 C (1.9 F)
n/a
n/a
Apr
34.4 C (93.9 F)
-6.7 C (19.9 F)
n/a
n/a
May
37.2 C (99.0 F)
-1.1 C (30.0 F)
n/a
n/a
Jun
41.1 C (106.0 F)
2.2 C (36.0 F)
n/a
n/a
Jul
42.2 C (108.0 F)
8.3 C (46.9 F)
n/a
n/a
Aug
41.7 C (107.1 F)
6.7 C (44.1 F)
n/a
n/a
Sep
41.1 C (106.0 F)
-1.1 C (30.0 F)
n/a
n/a
Oct
35.6 C (96.1 F)
-10.6 C (12.9 F)
n/a
n/a
Nov
27.8 C (82.0 F)
-13.9 C (7.0 F)
n/a
n/a
Dec
24.4 C (75.9 F)
-20.0 C (-4.0 F)
n/a
n/a
Which Years Hold Standing Records
1,464 standing records
Year with most
1,464 records at Decatur 1 N still stand. 1925 holds the most, with 55.
Standing records at Decatur 1 N by the year they were set
Year set
Standing records
1895
2
1896
31
1897
18
1898
21
1899
35
1900
21
1901
29
1902
31
1903
29
1904
10
1905
20
1906
17
1907
20
1908
24
1909
23
1910
24
1911
38
1912
21
1913
27
1914
39
1915
35
1916
26
1917
50
1918
34
1919
22
1920
19
1921
14
1922
20
1923
19
1924
27
1925
55
1926
23
1927
38
1928
22
1929
32
1930
40
1931
46
1932
30
1933
18
1934
16
1935
35
1936
39
1937
31
1938
10
1939
22
1940
37
1941
16
1942
13
1943
22
1944
21
1945
19
1946
18
1947
24
1948
3
1952
24
1953
8
1954
26
1955
17
1956
13
All-Time Record Progression
1 new records
1 all-time records were set at Decatur 1 N between 28 July 1930 and 28 July 1930. Each dot is a new record.
When Decatur 1 N set new all-time records
Date
Kind
Detail
1930-07-28
Record high maximum temperature
Record high maximum temperature 42.2 C (108.0 F)
Wettest Day of Each Month
Aug: 203.2 mm (8.0 in)
The wettest day on record for each calendar month at Decatur 1 N. The most was 203.2 mm (8.0 in) on 17 August 1920.
Record daily precipitation for each month at Decatur 1 N
Month
Record daily precipitation (mm)
Date
Jan
152.4 mm (6.0 in)
7 January 1946
Feb
84.3 mm (3.3 in)
22 February 1909
Mar
83.8 mm (3.3 in)
2 March 1934
Apr
106.7 mm (4.2 in)
1 April 1896
May
79.5 mm (3.1 in)
21 May 1901
Jun
122.7 mm (4.8 in)
30 June 1905
Jul
89.9 mm (3.5 in)
9 July 1942
Aug
203.2 mm (8.0 in)
17 August 1920
Sep
93.5 mm (3.7 in)
29 September 1896
Oct
85.3 mm (3.4 in)
16 October 1932
Nov
105.7 mm (4.2 in)
17 November 1927
Dec
120.9 mm (4.8 in)
14 December 1901
Period of Record Coverage
1895 to 1956
Complete yearUnder 90 percent of days
59 years of record at Decatur 1 N, 1895 to 1956. 9 years have data for under 90 percent of days and are left out of rankings: 1895, 1900, 1906, 1907, 1948, 1952, 1953, 1955 and others.
Cooler than the station meanWarmer than the station mean
One stripe for each of 41 complete years at Decatur 1 N, 1896 to 1947. Blue stripes are years cooler than the station's own mean of 15.1 C (59.2 F); red stripes are warmer. The coolest year was 1947, at 13.3 C (55.9 F), and the warmest was 1921, at 16.4 C (61.5 F). The strongest colour marks a difference of 1.9 C (3.4 F).
Annual mean temperature at Decatur 1 N as warming stripes, 1896 to 1947
Year
Annual mean temperature
Difference from the station mean
1896
15.3 C
+0.19 C
1897
15.1 C
-0.04 C
1898
15.0 C
-0.06 C
1899
14.8 C
-0.31 C
1901
14.0 C
-1.13 C
1902
14.8 C
-0.35 C
1908
15.6 C
+0.46 C
1910
14.4 C
-0.70 C
1911
16.2 C
+1.05 C
1912
14.3 C
-0.76 C
1913
15.6 C
+0.52 C
1914
14.8 C
-0.34 C
1915
14.9 C
-0.16 C
1917
13.5 C
-1.62 C
1918
15.2 C
+0.11 C
1919
15.7 C
+0.55 C
1920
14.3 C
-0.83 C
1921
16.4 C
+1.29 C
1922
15.8 C
+0.71 C
1923
15.1 C
-0.02 C
1925
15.9 C
+0.76 C
1926
14.9 C
-0.24 C
1927
15.8 C
+0.71 C
1929
14.8 C
-0.31 C
1930
15.1 C
+0.03 C
1931
15.8 C
+0.66 C
1932
15.7 C
+0.63 C
1933
16.0 C
+0.93 C
1934
15.4 C
+0.33 C
1935
15.5 C
+0.38 C
1936
15.6 C
+0.49 C
1937
15.1 C
+0.01 C
1938
15.7 C
+0.63 C
1939
15.5 C
+0.36 C
1940
13.7 C
-1.36 C
1941
15.2 C
+0.05 C
1942
14.3 C
-0.81 C
1944
15.0 C
-0.06 C
1945
15.1 C
-0.02 C
1946
15.0 C
-0.09 C
1947
13.3 C
-1.84 C
The fitted trend in annual mean temperature here over 1896 to 1947 is 0.01 C (-0.14 to 0.16) per decade. The interval includes zero, so the trend is not clearly different from zero. In Fahrenheit: 0.01 F (-0.26 to 0.29) per decade. The slope is a straight line fitted to 41 complete years; the brackets give its 95 percent interval.
Fitted temperature trends per decade at Decatur 1 N
Measure
Per decade (C)
Per decade (F)
Period
Complete years
Reading
Annual mean temperature
0.01 C (-0.14 to 0.16) per decade
0.01 F (-0.26 to 0.29) per decade
1896 to 1947
41
Not clearly different from zero
Mean daily maximum
-0.02 C (-0.21 to 0.17) per decade
-0.04 F (-0.38 to 0.30) per decade
1896 to 1947
41
Not clearly different from zero
Mean daily minimum
0.04 C (-0.11 to 0.19) per decade
0.1 F (-0.2 to 0.3) per decade
1896 to 1947
41
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
1895 to 1956
Yearly extremes at Decatur 1 N: the record and the median year
Measure
Record
Year of the record
Median year
Years with a value
Hottest day (TXx)
42.2 C (108.0 F)
1930
37.2 C (99.0 F)
59
Coldest night (TNn)
-28.9 C (-20.0 F)
1905
-15.0 C (5.0 F)
59
Wettest day (Rx1day)
203.2 mm (8.0 in)
1920
72.9 mm (2.9 in)
59
Wettest five days (Rx5day)
296.7 mm (11.7 in)
1901
120.7 mm (4.8 in)
59
Longest dry spell (CDD)
38 days
1897
19 days
59
Hottest day (TXx)
The hottest day of the year at Decatur 1 N, 1895 to 1956. The record is 42.2 C (108.0 F) in 1930, marked on the chart; the median year is 37.2 C (99.0 F).
Hottest day (TXx) at Decatur 1 N by year
Year
Hottest day (TXx)
1895
21.1 C (70.0 F)
1896
36.7 C (98.1 F)
1897
36.7 C (98.1 F)
1898
37.2 C (99.0 F)
1899
36.7 C (98.1 F)
1900
35.0 C (95.0 F)
1901
39.4 C (102.9 F)
1902
37.8 C (100.0 F)
1903
35.6 C (96.1 F)
1904
36.7 C (98.1 F)
1905
36.1 C (97.0 F)
1906
35.0 C (95.0 F)
1907
37.2 C (99.0 F)
1908
37.2 C (99.0 F)
1909
37.8 C (100.0 F)
1910
36.1 C (97.0 F)
1911
37.8 C (100.0 F)
1912
36.7 C (98.1 F)
1913
40.0 C (104.0 F)
1914
39.4 C (102.9 F)
1915
37.8 C (100.0 F)
1916
36.7 C (98.1 F)
1917
35.6 C (96.1 F)
1918
38.9 C (102.0 F)
1919
37.8 C (100.0 F)
1920
36.1 C (97.0 F)
1921
37.2 C (99.0 F)
1922
37.2 C (99.0 F)
1923
35.0 C (95.0 F)
1924
37.2 C (99.0 F)
1925
41.1 C (106.0 F)
1926
38.3 C (100.9 F)
1927
37.2 C (99.0 F)
1928
34.4 C (93.9 F)
1929
36.1 C (97.0 F)
1930
42.2 C (108.0 F)
1931
40.0 C (104.0 F)
1932
38.3 C (100.9 F)
1933
38.3 C (100.9 F)
1934
41.1 C (106.0 F)
1935
41.1 C (106.0 F)
1936
41.1 C (106.0 F)
1937
37.2 C (99.0 F)
1938
36.1 C (97.0 F)
1939
37.2 C (99.0 F)
1940
36.1 C (97.0 F)
1941
36.7 C (98.1 F)
1942
35.0 C (95.0 F)
1943
39.4 C (102.9 F)
1944
38.9 C (102.0 F)
1945
37.8 C (100.0 F)
1946
32.2 C (90.0 F)
1947
35.0 C (95.0 F)
1948
27.2 C (81.0 F)
1952
42.2 C (108.0 F)
1953
37.8 C (100.0 F)
1954
39.4 C (102.9 F)
1955
35.0 C (95.0 F)
1956
36.7 C (98.1 F)
Coldest night (TNn)
The coldest night of the year at Decatur 1 N, 1895 to 1956. The record is -28.9 C (-20.0 F) in 1905, marked on the chart; the median year is -15.0 C (5.0 F).
Coldest night (TNn) at Decatur 1 N by year
Year
Coldest night (TNn)
1895
-12.2 C (10.0 F)
1896
-14.4 C (6.1 F)
1897
-22.8 C (-9.0 F)
1898
-13.3 C (8.1 F)
1899
-25.0 C (-13.0 F)
1900
-16.1 C (3.0 F)
1901
-17.2 C (1.0 F)
1902
-12.8 C (9.0 F)
1903
-14.4 C (6.1 F)
1904
-12.8 C (9.0 F)
1905
-28.9 C (-20.0 F)
1906
-11.7 C (10.9 F)
1907
-9.4 C (15.1 F)
1908
-13.3 C (8.1 F)
1909
-15.6 C (3.9 F)
1910
-13.3 C (8.1 F)
1911
-13.3 C (8.1 F)
1912
-17.2 C (1.0 F)
1913
-10.6 C (12.9 F)
1914
-17.8 C (0.0 F)
1915
-12.2 C (10.0 F)
1916
-19.4 C (-2.9 F)
1917
-17.8 C (0.0 F)
1918
-20.0 C (-4.0 F)
1919
-18.3 C (-0.9 F)
1920
-13.9 C (7.0 F)
1921
-6.7 C (19.9 F)
1922
-11.1 C (12.0 F)
1923
-12.8 C (9.0 F)
1924
-18.9 C (-2.0 F)
1925
-16.7 C (1.9 F)
1926
-11.7 C (10.9 F)
1927
-16.1 C (3.0 F)
1928
-18.3 C (-0.9 F)
1929
-20.0 C (-4.0 F)
1930
-15.0 C (5.0 F)
1931
-11.1 C (12.0 F)
1932
-12.8 C (9.0 F)
1933
-16.7 C (1.9 F)
1934
-15.0 C (5.0 F)
1935
-15.0 C (5.0 F)
1936
-17.8 C (0.0 F)
1937
-15.0 C (5.0 F)
1938
-12.8 C (9.0 F)
1939
-11.1 C (12.0 F)
1940
-28.3 C (-18.9 F)
1941
-8.9 C (16.0 F)
1942
-18.9 C (-2.0 F)
1943
-15.6 C (3.9 F)
1944
-15.0 C (5.0 F)
1945
-13.3 C (8.1 F)
1946
-11.7 C (10.9 F)
1947
-13.3 C (8.1 F)
1948
-15.6 C (3.9 F)
1952
-10.0 C (14.0 F)
1953
-15.0 C (5.0 F)
1954
-11.7 C (10.9 F)
1955
-15.0 C (5.0 F)
1956
-10.0 C (14.0 F)
Wettest day (Rx1day)
The wettest day of the year at Decatur 1 N, 1895 to 1956. The record is 203.2 mm (8.0 in) in 1920, marked on the chart; the median year is 72.9 mm (2.9 in).
Wettest day (Rx1day) at Decatur 1 N by year
Year
Wettest day (Rx1day)
1895
30.0 mm (1.2 in)
1896
106.7 mm (4.2 in)
1897
97.5 mm (3.8 in)
1898
69.9 mm (2.8 in)
1899
76.2 mm (3.0 in)
1900
72.4 mm (2.9 in)
1901
120.9 mm (4.8 in)
1902
56.6 mm (2.2 in)
1903
76.7 mm (3.0 in)
1904
40.4 mm (1.6 in)
1905
122.7 mm (4.8 in)
1906
53.3 mm (2.1 in)
1907
69.9 mm (2.8 in)
1908
61.0 mm (2.4 in)
1909
85.6 mm (3.4 in)
1910
111.8 mm (4.4 in)
1911
104.9 mm (4.1 in)
1912
50.8 mm (2.0 in)
1913
54.9 mm (2.2 in)
1914
66.0 mm (2.6 in)
1915
82.0 mm (3.2 in)
1916
100.1 mm (3.9 in)
1917
64.8 mm (2.6 in)
1918
53.6 mm (2.1 in)
1919
65.3 mm (2.6 in)
1920
203.2 mm (8.0 in)
1921
93.5 mm (3.7 in)
1922
56.9 mm (2.2 in)
1923
44.2 mm (1.7 in)
1924
83.3 mm (3.3 in)
1925
50.8 mm (2.0 in)
1926
73.7 mm (2.9 in)
1927
105.7 mm (4.2 in)
1928
72.9 mm (2.9 in)
1929
82.0 mm (3.2 in)
1930
74.9 mm (2.9 in)
1931
60.5 mm (2.4 in)
1932
85.3 mm (3.4 in)
1933
64.0 mm (2.5 in)
1934
129.5 mm (5.1 in)
1935
70.4 mm (2.8 in)
1936
76.2 mm (3.0 in)
1937
102.1 mm (4.0 in)
1938
75.4 mm (3.0 in)
1939
54.6 mm (2.1 in)
1940
48.8 mm (1.9 in)
1941
63.8 mm (2.5 in)
1942
114.3 mm (4.5 in)
1943
89.4 mm (3.5 in)
1944
73.2 mm (2.9 in)
1945
65.0 mm (2.6 in)
1946
152.4 mm (6.0 in)
1947
52.1 mm (2.1 in)
1948
54.1 mm (2.1 in)
1952
72.4 mm (2.9 in)
1953
62.2 mm (2.4 in)
1954
73.7 mm (2.9 in)
1955
38.1 mm (1.5 in)
1956
83.8 mm (3.3 in)
Wettest five days (Rx5day)
The wettest five days of the year at Decatur 1 N, 1895 to 1956. The record is 296.7 mm (11.7 in) in 1901, marked on the chart; the median year is 120.7 mm (4.8 in).
Wettest five days (Rx5day) at Decatur 1 N by year
Year
Wettest five days (Rx5day)
1895
38.4 mm (1.5 in)
1896
142.8 mm (5.6 in)
1897
157.2 mm (6.2 in)
1898
149.9 mm (5.9 in)
1899
197.1 mm (7.8 in)
1900
79.3 mm (3.1 in)
1901
296.7 mm (11.7 in)
1902
130.3 mm (5.1 in)
1903
150.9 mm (5.9 in)
1904
76.5 mm (3.0 in)
1905
131.9 mm (5.2 in)
1906
66.6 mm (2.6 in)
1907
80.1 mm (3.2 in)
1908
138.6 mm (5.5 in)
1909
120.1 mm (4.7 in)
1910
114.6 mm (4.5 in)
1911
176.1 mm (6.9 in)
1912
111.7 mm (4.4 in)
1913
102.3 mm (4.0 in)
1914
95.3 mm (3.8 in)
1915
205.7 mm (8.1 in)
1916
159.0 mm (6.3 in)
1917
136.7 mm (5.4 in)
1918
74.2 mm (2.9 in)
1919
127.9 mm (5.0 in)
1920
233.7 mm (9.2 in)
1921
104.7 mm (4.1 in)
1922
111.9 mm (4.4 in)
1923
80.5 mm (3.2 in)
1924
135.2 mm (5.3 in)
1925
97.5 mm (3.8 in)
1926
161.8 mm (6.4 in)
1927
108.2 mm (4.3 in)
1928
119.3 mm (4.7 in)
1929
151.9 mm (6.0 in)
1930
108.1 mm (4.3 in)
1931
86.4 mm (3.4 in)
1932
104.4 mm (4.1 in)
1933
95.8 mm (3.8 in)
1934
145.3 mm (5.7 in)
1935
103.7 mm (4.1 in)
1936
146.9 mm (5.8 in)
1937
120.7 mm (4.8 in)
1938
147.5 mm (5.8 in)
1939
116.8 mm (4.6 in)
1940
77.7 mm (3.1 in)
1941
121.5 mm (4.8 in)
1942
185.2 mm (7.3 in)
1943
176.8 mm (7.0 in)
1944
105.9 mm (4.2 in)
1945
103.9 mm (4.1 in)
1946
222.5 mm (8.8 in)
1947
121.2 mm (4.8 in)
1948
155.4 mm (6.1 in)
1952
87.4 mm (3.4 in)
1953
92.7 mm (3.6 in)
1954
122.0 mm (4.8 in)
1955
97.8 mm (3.9 in)
1956
134.1 mm (5.3 in)
Longest dry spell (CDD)
The longest dry spell of the year at Decatur 1 N, 1895 to 1956. The record is 38 days in 1897, marked on the chart; the median year is 19 days.
Longest dry spell (CDD) at Decatur 1 N by year
Year
Longest dry spell (CDD)
1895
14 days
1896
14 days
1897
38 days
1898
19 days
1899
16 days
1900
13 days
1901
20 days
1902
17 days
1903
24 days
1904
36 days
1905
13 days
1906
22 days
1907
18 days
1908
22 days
1909
16 days
1910
14 days
1911
17 days
1912
19 days
1913
19 days
1914
20 days
1915
20 days
1916
19 days
1917
20 days
1918
15 days
1919
20 days
1920
25 days
1921
22 days
1922
14 days
1923
22 days
1924
25 days
1925
24 days
1926
17 days
1927
20 days
1928
11 days
1929
22 days
1930
19 days
1931
34 days
1932
18 days
1933
18 days
1934
15 days
1935
24 days
1936
22 days
1937
10 days
1938
20 days
1939
25 days
1940
26 days
1941
17 days
1942
17 days
1943
27 days
1944
21 days
1945
15 days
1946
15 days
1947
15 days
1948
10 days
1952
30 days
1953
30 days
1954
20 days
1955
18 days
1956
18 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
41 years with a frost
Across 41 years with a frost, the median last spring frost at Decatur 1 N falls on 12 April and the median first autumn frost on 23 October, which leaves a median of 194 days between them.
Fitted over all years, the growing season changes by +0.5 days per decade at this station.
Frost dates and growing season at Decatur 1 N
Measure
Median, all years
Earliest period
Recent period (1914 to 1947)
Recent against earliest
Fitted trend
Last spring frost
12 April
n/a
14 April
n/a
+0.5 days per decade
First autumn frost
23 October
n/a
22 October
n/a
+0.9 days per decade
Growing days
194 days
n/a
191 days
n/a
+0.5 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
54 years, 1896 to 1955
A day with at least 73.0 mm (2.9 in) of rain is expected about once in 2 years. A day with at least 186.7 mm (7.4 in) of rain is expected about once in 100 years.
Rainfall return levels at Decatur 1 N: the daily rain expected about once in a given number of years
Expected about once in
A day with at least
Note
2 years
73.0 mm (2.9 in)
5 years
97.7 mm (3.8 in)
10 years
116.1 mm (4.6 in)
25 years
142.1 mm (5.6 in)
50 years
163.5 mm (6.4 in)
100 years
186.7 mm (7.4 in)
Longer than the 54 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, 54 years of values from 1896 to 1955.
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: 203.2 mm (8.0 in) in 1920; 152.4 mm (6.0 in) in 1946; 129.5 mm (5.1 in) in 1934.
Station Changes
1 suspected
One change was suspected in the annual mean temperature of Decatur 1 N, 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) lower than in the years before (possible change).
Suspected changes in the annual mean temperature at Decatur 1 N, against neighbouring stations
Year
Shift (C)
Shift (F)
Strength
Neighbours
1941
-0.3
-0.6
possible
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 Decatur 1 N standing records by year: CSV or JSON. Field meanings are on the data page.
Data for Decatur 1 N 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.