Record envelope, standing records and threshold days for Chattanooga Wb City (USW00053875), Tennessee, United States, with 72 years of record.
Key Facts for Chattanooga Wb City
Chattanooga Wb City (USW00053875) is a weather station in Tennessee, United States at 35.07 latitude and -85.30 longitude, 209 m (685 ft) above sea level.
The station reports from 1879 to 1950, 72 years of record.
1,464 records set at Chattanooga Wb City still stand.
Records are tracked for tmax, tmin, prcp, snow: an element needs 30 years of data to be eligible.
Chattanooga Wb City set a daily record low maximum temperature of 0.6 C (33.1 F) on 28 November 1950.
About the Station
Location: Tennessee, United States, 35.07 latitude, -85.30 longitude.
Elevation: 209 m (685 ft).
Period of record: 1879 to 1950, 72 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 Chattanooga Wb City. 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 Chattanooga Wb City, with 2026 drawn through them
Month
Highest record high
Lowest record low
2026 highest maximum
2026 lowest minimum
Jan
26.1 C (79.0 F)
-21.7 C (-7.1 F)
n/a
n/a
Feb
26.1 C (79.0 F)
-23.3 C (-9.9 F)
n/a
n/a
Mar
31.7 C (89.1 F)
-16.7 C (1.9 F)
n/a
n/a
Apr
33.3 C (91.9 F)
-3.9 C (25.0 F)
n/a
n/a
May
35.0 C (95.0 F)
1.1 C (34.0 F)
n/a
n/a
Jun
38.9 C (102.0 F)
3.9 C (39.0 F)
n/a
n/a
Jul
40.0 C (104.0 F)
13.3 C (55.9 F)
n/a
n/a
Aug
40.0 C (104.0 F)
12.2 C (54.0 F)
n/a
n/a
Sep
40.0 C (104.0 F)
3.3 C (37.9 F)
n/a
n/a
Oct
33.3 C (91.9 F)
-3.3 C (26.1 F)
n/a
n/a
Nov
28.3 C (82.9 F)
-14.4 C (6.1 F)
n/a
n/a
Dec
23.9 C (75.0 F)
-16.1 C (3.0 F)
n/a
n/a
Which Years Hold Standing Records
1,464 standing records
Year with most
1,464 records at Chattanooga Wb City still stand. 1925 holds the most, with 46.
Standing records at Chattanooga Wb City by the year they were set
Year set
Standing records
1879
45
1880
25
1881
27
1882
19
1883
13
1884
24
1885
20
1886
30
1887
31
1888
16
1889
35
1890
30
1891
24
1892
15
1893
17
1894
30
1895
27
1896
27
1897
21
1898
23
1899
34
1900
19
1901
34
1902
26
1903
23
1904
13
1905
18
1906
15
1907
34
1908
8
1909
18
1910
19
1911
24
1912
15
1913
25
1914
19
1915
12
1916
16
1917
36
1918
21
1919
17
1920
14
1921
21
1922
13
1923
14
1924
17
1925
46
1926
14
1927
34
1928
15
1929
21
1930
18
1931
24
1932
20
1933
19
1934
22
1935
28
1936
46
1937
22
1938
9
1939
21
1940
25
1948
6
1949
19
1950
31
All-Time Record Progression
3 new records
3 all-time records were set at Chattanooga Wb City between 4 April 1911 and 5 September 1925. Each dot is a new record.
When Chattanooga Wb City set new all-time records
Date
Kind
Detail
1911-04-04
Record daily precipitation
Record daily precipitation 152.1 mm (6.0 in)
1925-09-04
Record high maximum temperature
Record high maximum temperature 38.9 C (102.0 F)
1925-09-05
Record high maximum temperature
Record high maximum temperature 40.0 C (104.0 F)
Wettest Day of Each Month
Apr: 152.1 mm (6.0 in)
The wettest day on record for each calendar month at Chattanooga Wb City. The most was 152.1 mm (6.0 in) on 4 April 1911.
Record daily precipitation for each month at Chattanooga Wb City
Month
Record daily precipitation (mm)
Date
Jan
104.6 mm (4.1 in)
5 January 1949
Feb
81.0 mm (3.2 in)
7 February 1884
Mar
130.8 mm (5.1 in)
30 March 1886
Apr
152.1 mm (6.0 in)
4 April 1911
May
88.1 mm (3.5 in)
30 May 1903
Jun
82.6 mm (3.3 in)
16 June 1949
Jul
122.9 mm (4.8 in)
8 July 1916
Aug
81.5 mm (3.2 in)
5 August 1908
Sep
109.2 mm (4.3 in)
2 September 1898
Oct
102.6 mm (4.0 in)
16 October 1932
Nov
76.2 mm (3.0 in)
22 November 1883
Dec
77.5 mm (3.1 in)
6 December 1908
Period of Record Coverage
1879 to 1950
Complete yearUnder 90 percent of days
65 years of record at Chattanooga Wb City, 1879 to 1950. 2 years have data for under 90 percent of days and are left out of rankings: 1940, 1948.
Cooler than the station meanWarmer than the station mean
One stripe for each of 63 complete years at Chattanooga Wb City, 1879 to 1950. Blue stripes are years cooler than the station's own mean of 16.0 C (60.8 F); red stripes are warmer. The coolest year was 1917, at 14.5 C (58.0 F), and the warmest was 1949, at 17.5 C (63.4 F). The strongest colour marks a difference of 1.6 C (2.9 F).
Annual mean temperature at Chattanooga Wb City as warming stripes, 1879 to 1950
Year
Annual mean temperature
Difference from the station mean
1879
16.2 C
+0.18 C
1880
16.1 C
+0.12 C
1881
16.3 C
+0.33 C
1882
16.2 C
+0.20 C
1883
16.4 C
+0.38 C
1884
15.8 C
-0.19 C
1885
14.7 C
-1.30 C
1886
14.5 C
-1.47 C
1887
16.0 C
+0.01 C
1888
15.8 C
-0.17 C
1889
15.8 C
-0.22 C
1890
16.9 C
+0.88 C
1891
15.9 C
-0.10 C
1892
15.2 C
-0.80 C
1893
15.6 C
-0.40 C
1894
16.2 C
+0.17 C
1895
14.8 C
-1.21 C
1896
16.4 C
+0.41 C
1897
16.1 C
+0.14 C
1898
15.9 C
-0.13 C
1899
15.7 C
-0.25 C
1900
16.1 C
+0.08 C
1901
14.6 C
-1.35 C
1902
15.7 C
-0.27 C
1903
15.0 C
-0.95 C
1904
15.0 C
-0.95 C
1905
15.4 C
-0.55 C
1906
15.9 C
-0.14 C
1907
16.0 C
+0.01 C
1908
16.2 C
+0.25 C
1909
16.0 C
+0.03 C
1910
15.3 C
-0.65 C
1911
16.8 C
+0.76 C
1912
15.0 C
-1.00 C
1913
16.2 C
+0.25 C
1914
15.6 C
-0.38 C
1915
15.8 C
-0.19 C
1916
15.8 C
-0.22 C
1917
14.5 C
-1.53 C
1918
16.0 C
+0.03 C
1919
16.2 C
+0.25 C
1920
15.0 C
-0.99 C
1921
17.1 C
+1.11 C
1922
16.6 C
+0.62 C
1923
15.9 C
-0.09 C
1924
15.0 C
-1.04 C
1925
16.9 C
+0.86 C
1926
15.5 C
-0.46 C
1927
16.8 C
+0.84 C
1928
15.3 C
-0.65 C
1929
15.7 C
-0.32 C
1930
16.0 C
+0.00 C
1931
16.9 C
+0.94 C
1932
16.4 C
+0.44 C
1933
17.0 C
+0.96 C
1934
16.6 C
+0.65 C
1935
16.9 C
+0.86 C
1936
17.0 C
+1.00 C
1937
16.5 C
+0.48 C
1938
17.3 C
+1.28 C
1939
17.2 C
+1.17 C
1949
17.5 C
+1.47 C
1950
16.6 C
+0.56 C
The annual mean temperature here has risen by 0.2 C (0.1 to 0.2) per decade over 1879 to 1950. In Fahrenheit: 0.3 F (0.1 to 0.4) per decade. The slope is a straight line fitted to 63 complete years; the brackets give its 95 percent interval.
Fitted temperature trends per decade at Chattanooga Wb City
Measure
Per decade (C)
Per decade (F)
Period
Complete years
Reading
Annual mean temperature
0.2 C (0.1 to 0.2) per decade
0.3 F (0.1 to 0.4) per decade
1879 to 1950
63
Rise
Mean daily maximum
0.2 C (0.1 to 0.3) per decade
0.3 F (0.1 to 0.5) per decade
1879 to 1950
63
Rise
Mean daily minimum
0.2 C (0.1 to 0.2) per decade
0.3 F (0.1 to 0.4) per decade
1879 to 1950
63
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
1879 to 1950
Yearly extremes at Chattanooga Wb City: the record and the median year
Measure
Record
Year of the record
Median year
Years with a value
Hottest day (TXx)
40.0 C (104.0 F)
1925
36.1 C (97.0 F)
65
Coldest night (TNn)
-23.3 C (-9.9 F)
1899
-12.2 C (10.0 F)
65
Wettest day (Rx1day)
152.1 mm (6.0 in)
1911
73.7 mm (2.9 in)
65
Wettest five days (Rx5day)
273.5 mm (10.8 in)
1916
120.5 mm (4.7 in)
65
Longest dry spell (CDD)
41 days
1931
20 days
65
Hottest day (TXx)
The hottest day of the year at Chattanooga Wb City, 1879 to 1950. The record is 40.0 C (104.0 F) in 1925, marked on the chart; the median year is 36.1 C (97.0 F).
Hottest day (TXx) at Chattanooga Wb City by year
Year
Hottest day (TXx)
1879
38.3 C (100.9 F)
1880
35.0 C (95.0 F)
1881
37.8 C (100.0 F)
1882
34.4 C (93.9 F)
1883
36.1 C (97.0 F)
1884
33.3 C (91.9 F)
1885
35.6 C (96.1 F)
1886
36.1 C (97.0 F)
1887
37.2 C (99.0 F)
1888
36.7 C (98.1 F)
1889
33.3 C (91.9 F)
1890
35.0 C (95.0 F)
1891
35.6 C (96.1 F)
1892
35.0 C (95.0 F)
1893
36.7 C (98.1 F)
1894
36.7 C (98.1 F)
1895
36.1 C (97.0 F)
1896
36.7 C (98.1 F)
1897
36.7 C (98.1 F)
1898
36.1 C (97.0 F)
1899
36.7 C (98.1 F)
1900
36.7 C (98.1 F)
1901
37.8 C (100.0 F)
1902
38.3 C (100.9 F)
1903
34.4 C (93.9 F)
1904
35.0 C (95.0 F)
1905
35.0 C (95.0 F)
1906
34.4 C (93.9 F)
1907
35.6 C (96.1 F)
1908
35.0 C (95.0 F)
1909
35.0 C (95.0 F)
1910
33.3 C (91.9 F)
1911
36.1 C (97.0 F)
1912
34.4 C (93.9 F)
1913
36.7 C (98.1 F)
1914
36.7 C (98.1 F)
1915
36.1 C (97.0 F)
1916
34.4 C (93.9 F)
1917
35.6 C (96.1 F)
1918
36.1 C (97.0 F)
1919
36.7 C (98.1 F)
1920
33.9 C (93.0 F)
1921
36.7 C (98.1 F)
1922
35.0 C (95.0 F)
1923
33.9 C (93.0 F)
1924
37.8 C (100.0 F)
1925
40.0 C (104.0 F)
1926
37.8 C (100.0 F)
1927
36.7 C (98.1 F)
1928
34.4 C (93.9 F)
1929
34.4 C (93.9 F)
1930
40.0 C (104.0 F)
1931
38.3 C (100.9 F)
1932
36.1 C (97.0 F)
1933
37.8 C (100.0 F)
1934
40.0 C (104.0 F)
1935
40.0 C (104.0 F)
1936
39.4 C (102.9 F)
1937
37.2 C (99.0 F)
1938
36.1 C (97.0 F)
1939
36.7 C (98.1 F)
1940
35.0 C (95.0 F)
1948
33.3 C (91.9 F)
1949
36.7 C (98.1 F)
1950
35.6 C (96.1 F)
Coldest night (TNn)
The coldest night of the year at Chattanooga Wb City, 1879 to 1950. The record is -23.3 C (-9.9 F) in 1899, marked on the chart; the median year is -12.2 C (10.0 F).
Coldest night (TNn) at Chattanooga Wb City by year
Year
Coldest night (TNn)
1879
-11.1 C (12.0 F)
1880
-16.1 C (3.0 F)
1881
-10.6 C (12.9 F)
1882
-11.1 C (12.0 F)
1883
-10.0 C (14.0 F)
1884
-18.3 C (-0.9 F)
1885
-14.4 C (6.1 F)
1886
-21.7 C (-7.1 F)
1887
-13.9 C (7.0 F)
1888
-12.2 C (10.0 F)
1889
-10.6 C (12.9 F)
1890
-9.4 C (15.1 F)
1891
-7.8 C (18.0 F)
1892
-11.1 C (12.0 F)
1893
-15.0 C (5.0 F)
1894
-15.0 C (5.0 F)
1895
-18.9 C (-2.0 F)
1896
-13.3 C (8.1 F)
1897
-14.4 C (6.1 F)
1898
-11.1 C (12.0 F)
1899
-23.3 C (-9.9 F)
1900
-13.3 C (8.1 F)
1901
-15.0 C (5.0 F)
1902
-10.6 C (12.9 F)
1903
-14.4 C (6.1 F)
1904
-10.0 C (14.0 F)
1905
-20.0 C (-4.0 F)
1906
-8.3 C (17.1 F)
1907
-7.2 C (19.0 F)
1908
-10.6 C (12.9 F)
1909
-14.4 C (6.1 F)
1910
-10.6 C (12.9 F)
1911
-12.2 C (10.0 F)
1912
-16.1 C (3.0 F)
1913
-7.8 C (18.0 F)
1914
-14.4 C (6.1 F)
1915
-5.6 C (21.9 F)
1916
-11.1 C (12.0 F)
1917
-15.6 C (3.9 F)
1918
-18.3 C (-0.9 F)
1919
-15.6 C (3.9 F)
1920
-11.1 C (12.0 F)
1921
-3.9 C (25.0 F)
1922
-6.7 C (19.9 F)
1923
-11.1 C (12.0 F)
1924
-18.3 C (-0.9 F)
1925
-15.6 C (3.9 F)
1926
-8.3 C (17.1 F)
1927
-15.6 C (3.9 F)
1928
-17.8 C (0.0 F)
1929
-12.8 C (9.0 F)
1930
-12.2 C (10.0 F)
1931
-8.3 C (17.1 F)
1932
-8.9 C (16.0 F)
1933
-15.6 C (3.9 F)
1934
-13.3 C (8.1 F)
1935
-11.7 C (10.9 F)
1936
-15.0 C (5.0 F)
1937
-11.1 C (12.0 F)
1938
-8.3 C (17.1 F)
1939
-7.8 C (18.0 F)
1940
-17.8 C (0.0 F)
1948
-6.7 C (19.9 F)
1949
-5.0 C (23.0 F)
1950
-14.4 C (6.1 F)
Wettest day (Rx1day)
The wettest day of the year at Chattanooga Wb City, 1879 to 1950. The record is 152.1 mm (6.0 in) in 1911, marked on the chart; the median year is 73.7 mm (2.9 in).
Wettest day (Rx1day) at Chattanooga Wb City by year
Year
Wettest day (Rx1day)
1879
64.5 mm (2.5 in)
1880
60.7 mm (2.4 in)
1881
73.2 mm (2.9 in)
1882
75.9 mm (3.0 in)
1883
76.2 mm (3.0 in)
1884
81.0 mm (3.2 in)
1885
55.9 mm (2.2 in)
1886
130.8 mm (5.1 in)
1887
88.4 mm (3.5 in)
1888
69.6 mm (2.7 in)
1889
64.8 mm (2.6 in)
1890
47.2 mm (1.9 in)
1891
74.7 mm (2.9 in)
1892
73.7 mm (2.9 in)
1893
69.6 mm (2.7 in)
1894
61.2 mm (2.4 in)
1895
49.3 mm (1.9 in)
1896
54.1 mm (2.1 in)
1897
52.6 mm (2.1 in)
1898
109.2 mm (4.3 in)
1899
104.1 mm (4.1 in)
1900
55.4 mm (2.2 in)
1901
77.5 mm (3.1 in)
1902
45.7 mm (1.8 in)
1903
88.1 mm (3.5 in)
1904
73.9 mm (2.9 in)
1905
53.1 mm (2.1 in)
1906
117.1 mm (4.6 in)
1907
65.8 mm (2.6 in)
1908
81.5 mm (3.2 in)
1909
77.2 mm (3.0 in)
1910
73.4 mm (2.9 in)
1911
152.1 mm (6.0 in)
1912
95.0 mm (3.7 in)
1913
53.8 mm (2.1 in)
1914
78.7 mm (3.1 in)
1915
104.6 mm (4.1 in)
1916
122.9 mm (4.8 in)
1917
47.2 mm (1.9 in)
1918
83.6 mm (3.3 in)
1919
52.3 mm (2.1 in)
1920
115.1 mm (4.5 in)
1921
98.0 mm (3.9 in)
1922
90.2 mm (3.6 in)
1923
56.4 mm (2.2 in)
1924
104.1 mm (4.1 in)
1925
81.3 mm (3.2 in)
1926
73.7 mm (2.9 in)
1927
78.0 mm (3.1 in)
1928
54.1 mm (2.1 in)
1929
67.3 mm (2.6 in)
1930
69.1 mm (2.7 in)
1931
75.2 mm (3.0 in)
1932
102.6 mm (4.0 in)
1933
117.1 mm (4.6 in)
1934
81.0 mm (3.2 in)
1935
62.2 mm (2.4 in)
1936
65.3 mm (2.6 in)
1937
72.9 mm (2.9 in)
1938
55.4 mm (2.2 in)
1939
43.9 mm (1.7 in)
1940
59.4 mm (2.3 in)
1948
47.0 mm (1.9 in)
1949
115.8 mm (4.6 in)
1950
100.1 mm (3.9 in)
Wettest five days (Rx5day)
The wettest five days of the year at Chattanooga Wb City, 1879 to 1950. The record is 273.5 mm (10.8 in) in 1916, marked on the chart; the median year is 120.5 mm (4.7 in).
Wettest five days (Rx5day) at Chattanooga Wb City by year
Year
Wettest five days (Rx5day)
1879
149.7 mm (5.9 in)
1880
162.8 mm (6.4 in)
1881
131.0 mm (5.2 in)
1882
97.3 mm (3.8 in)
1883
135.8 mm (5.3 in)
1884
134.9 mm (5.3 in)
1885
94.8 mm (3.7 in)
1886
262.1 mm (10.3 in)
1887
92.7 mm (3.6 in)
1888
121.9 mm (4.8 in)
1889
125.0 mm (4.9 in)
1890
111.0 mm (4.4 in)
1891
144.3 mm (5.7 in)
1892
136.9 mm (5.4 in)
1893
100.6 mm (4.0 in)
1894
100.6 mm (4.0 in)
1895
85.7 mm (3.4 in)
1896
86.7 mm (3.4 in)
1897
112.3 mm (4.4 in)
1898
118.6 mm (4.7 in)
1899
254.2 mm (10.0 in)
1900
107.4 mm (4.2 in)
1901
136.3 mm (5.4 in)
1902
67.4 mm (2.7 in)
1903
129.3 mm (5.1 in)
1904
79.2 mm (3.1 in)
1905
97.3 mm (3.8 in)
1906
165.4 mm (6.5 in)
1907
65.8 mm (2.6 in)
1908
131.4 mm (5.2 in)
1909
111.3 mm (4.4 in)
1910
89.6 mm (3.5 in)
1911
266.6 mm (10.5 in)
1912
115.3 mm (4.5 in)
1913
92.4 mm (3.6 in)
1914
141.6 mm (5.6 in)
1915
131.3 mm (5.2 in)
1916
273.5 mm (10.8 in)
1917
123.7 mm (4.9 in)
1918
91.3 mm (3.6 in)
1919
83.6 mm (3.3 in)
1920
195.5 mm (7.7 in)
1921
117.9 mm (4.6 in)
1922
120.5 mm (4.7 in)
1923
82.4 mm (3.2 in)
1924
151.8 mm (6.0 in)
1925
131.3 mm (5.2 in)
1926
139.2 mm (5.5 in)
1927
130.1 mm (5.1 in)
1928
120.7 mm (4.8 in)
1929
182.5 mm (7.2 in)
1930
99.2 mm (3.9 in)
1931
115.9 mm (4.6 in)
1932
150.3 mm (5.9 in)
1933
131.3 mm (5.2 in)
1934
115.8 mm (4.6 in)
1935
140.6 mm (5.5 in)
1936
112.4 mm (4.4 in)
1937
143.3 mm (5.6 in)
1938
117.6 mm (4.6 in)
1939
98.5 mm (3.9 in)
1940
87.8 mm (3.5 in)
1948
109.2 mm (4.3 in)
1949
148.3 mm (5.8 in)
1950
115.1 mm (4.5 in)
Longest dry spell (CDD)
The longest dry spell of the year at Chattanooga Wb City, 1879 to 1950. The record is 41 days in 1931, marked on the chart; the median year is 20 days.
Longest dry spell (CDD) at Chattanooga Wb City by year
Year
Longest dry spell (CDD)
1879
23 days
1880
11 days
1881
13 days
1882
15 days
1883
17 days
1884
26 days
1885
15 days
1886
23 days
1887
26 days
1888
20 days
1889
22 days
1890
16 days
1891
22 days
1892
16 days
1893
17 days
1894
17 days
1895
19 days
1896
17 days
1897
29 days
1898
21 days
1899
18 days
1900
16 days
1901
22 days
1902
22 days
1903
21 days
1904
28 days
1905
17 days
1906
23 days
1907
18 days
1908
18 days
1909
25 days
1910
27 days
1911
18 days
1912
20 days
1913
23 days
1914
24 days
1915
23 days
1916
20 days
1917
20 days
1918
16 days
1919
34 days
1920
39 days
1921
20 days
1922
15 days
1923
22 days
1924
26 days
1925
25 days
1926
14 days
1927
20 days
1928
17 days
1929
23 days
1930
26 days
1931
41 days
1932
16 days
1933
15 days
1934
13 days
1935
39 days
1936
24 days
1937
13 days
1938
23 days
1939
25 days
1940
13 days
1948
17 days
1949
12 days
1950
17 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
62 years with a frost
Across 62 years with a frost, the median last spring frost at Chattanooga Wb City falls on 24 March and the median first autumn frost on 8 November, which leaves a median of 228 days between them.
In 1911 to 1950 the median growing season was 229 days. That is 1 day more than in 1879 to 1908.
Fitted over all years, the growing season changes by +0.3 days per decade at this station.
Frost dates and growing season at Chattanooga Wb City
Measure
Median, all years
Earliest period (1879 to 1908)
Recent period (1911 to 1950)
Recent against earliest
Fitted trend
Last spring frost
24 March
24 March
21 March
3 days earlier
+0.2 days per decade
First autumn frost
8 November
7 November
12 November
5 days later
+0.5 days per decade
Growing days
228 days
228 days
229 days
1 day more
+0.3 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, 1879 to 1939
A day with at least 72.7 mm (2.9 in) of rain is expected about once in 2 years. A day with at least 154.7 mm (6.1 in) of rain is expected about once in 100 years.
Rainfall return levels at Chattanooga Wb City: the daily rain expected about once in a given number of years
Expected about once in
A day with at least
Note
2 years
72.7 mm (2.9 in)
5 years
93.4 mm (3.7 in)
10 years
107.6 mm (4.2 in)
25 years
126.1 mm (5.0 in)
50 years
140.3 mm (5.5 in)
100 years
154.7 mm (6.1 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 1879 to 1939.
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: 152.1 mm (6.0 in) in 1911; 130.8 mm (5.1 in) in 1886; 122.9 mm (4.8 in) in 1916.
Station Changes
2 suspected
2 changes were suspected in the annual mean temperature of Chattanooga Wb City, at 1901 and 1934. Each is measured against neighbouring stations.
Relative to 5 neighbouring stations, the station's annual mean temperature from 1901 ran 0.2 C (0.4 F) lower than in the years before (possible change).
Relative to 5 neighbouring stations, the station's annual mean temperature from 1934 ran 0.5 C (0.9 F) higher than in the years before (likely change).
Suspected changes in the annual mean temperature at Chattanooga Wb City, against neighbouring stations
Year
Shift (C)
Shift (F)
Strength
Neighbours
1901
-0.2
-0.4
possible
5
1934
+0.5
+0.9
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 Chattanooga Wb City standing records by year: CSV or JSON. Field meanings are on the data page.
Data for Chattanooga Wb City 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.