Record envelope, standing records and threshold days for Jackson 4 NW (USW00013956), Mississippi, United States, with 76 years of record.
Key Facts for Jackson 4 NW
Jackson 4 NW (USW00013956) is a weather station in Mississippi, United States at 32.33 latitude and -90.23 longitude, 98 m (322 ft) above sea level.
The station reports from 1896 to 1971, 76 years of record.
1,464 records set at Jackson 4 NW still stand.
Records are tracked for tmax, tmin, prcp, snow, snwd: an element needs 30 years of data to be eligible.
Jackson 4 NW tied a daily record low minimum temperature of 12.2 C (54.0 F) on 30 May 1971.
About the Station
Location: Mississippi, United States, 32.33 latitude, -90.23 longitude.
Elevation: 98 m (322 ft).
Period of record: 1896 to 1971, 76 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 Jackson 4 NW. 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 Jackson 4 NW, with 2026 drawn through them
Month
Highest record high
Lowest record low
2026 highest maximum
2026 lowest minimum
Jan
29.4 C (84.9 F)
-20.6 C (-5.1 F)
n/a
n/a
Feb
31.7 C (89.1 F)
-17.2 C (1.0 F)
n/a
n/a
Mar
35.0 C (95.0 F)
-8.3 C (17.1 F)
n/a
n/a
Apr
34.4 C (93.9 F)
-1.1 C (30.0 F)
n/a
n/a
May
37.8 C (100.0 F)
3.9 C (39.0 F)
n/a
n/a
Jun
40.6 C (105.1 F)
8.9 C (48.0 F)
n/a
n/a
Jul
41.7 C (107.1 F)
11.1 C (52.0 F)
n/a
n/a
Aug
41.1 C (106.0 F)
12.2 C (54.0 F)
n/a
n/a
Sep
41.7 C (107.1 F)
3.3 C (37.9 F)
n/a
n/a
Oct
36.7 C (98.1 F)
-3.3 C (26.1 F)
n/a
n/a
Nov
31.7 C (89.1 F)
-9.4 C (15.1 F)
n/a
n/a
Dec
28.9 C (84.0 F)
-13.3 C (8.1 F)
n/a
n/a
Which Years Hold Standing Records
1,464 standing records
Year with most
1,464 records at Jackson 4 NW still stand. 1902 holds the most, with 50.
Standing records at Jackson 4 NW by the year they were set
Year set
Standing records
1896
32
1897
29
1898
20
1899
40
1900
24
1901
24
1902
50
1903
20
1904
18
1905
21
1906
11
1907
27
1908
24
1909
21
1910
16
1911
45
1912
17
1913
15
1914
23
1915
15
1916
22
1917
40
1918
30
1919
17
1920
31
1921
31
1922
25
1923
17
1924
29
1925
40
1926
9
1927
32
1928
14
1929
19
1930
31
1931
17
1932
31
1933
14
1934
13
1935
18
1936
13
1937
25
1938
5
1939
8
1940
28
1941
7
1942
9
1943
28
1944
6
1945
6
1946
15
1947
14
1948
23
1949
12
1950
19
1951
26
1952
23
1953
14
1954
19
1955
18
1956
9
1957
18
1958
18
1959
8
1960
11
1961
19
1962
14
1963
11
1964
2
1965
9
1966
7
1967
16
1968
8
1969
4
1970
16
1971
4
All-Time Record Progression
4 new records
4 all-time records were set at Jackson 4 NW between 25 January 1940 and 10 January 1962. Each dot is a new record.
When Jackson 4 NW set new all-time records
Date
Kind
Detail
1940-01-25
Record low minimum temperature
Record low minimum temperature -16.7 C (1.9 F)
1940-01-26
Record low minimum temperature
Record low minimum temperature -17.2 C (1.0 F)
1940-01-27
Record low minimum temperature
Record low minimum temperature -20.6 C (-5.1 F)
1962-01-10
Record low maximum temperature
Record low maximum temperature -10.0 C (14.0 F)
Wettest Day of Each Month
Sep: 165.6 mm (6.5 in)
The wettest day on record for each calendar month at Jackson 4 NW. The most was 165.6 mm (6.5 in) on 27 September 1906.
Record daily precipitation for each month at Jackson 4 NW
Month
Record daily precipitation (mm)
Date
Jan
101.3 mm (4.0 in)
1 January 1911
Feb
144.5 mm (5.7 in)
2 February 1896
Mar
159.5 mm (6.3 in)
27 March 1902
Apr
160.0 mm (6.3 in)
16 April 1921
May
111.8 mm (4.4 in)
10 May 1925
Jun
131.8 mm (5.2 in)
17 June 1934
Jul
126.5 mm (5.0 in)
17 July 1933
Aug
101.3 mm (4.0 in)
9 August 1942
Sep
165.6 mm (6.5 in)
27 September 1906
Oct
102.6 mm (4.0 in)
1 October 1905
Nov
100.8 mm (4.0 in)
13 November 1957
Dec
145.5 mm (5.7 in)
27 December 1942
Period of Record Coverage
1896 to 1971
Complete yearUnder 90 percent of days
76 years of record at Jackson 4 NW, 1896 to 1971. 5 years have data for under 90 percent of days and are left out of rankings: 1899, 1921, 1963, 1964, 1971.
Cooler than the station meanWarmer than the station mean
One stripe for each of 66 complete years at Jackson 4 NW, 1896 to 1970. Blue stripes are years cooler than the station's own mean of 18.6 C (65.4 F); red stripes are warmer. The coolest year was 1958, at 17.0 C (62.7 F), and the warmest was 1927, at 20.6 C (69.1 F). The strongest colour marks a difference of 2.1 C (3.8 F).
Annual mean temperature at Jackson 4 NW as warming stripes, 1896 to 1970
Year
Annual mean temperature
Difference from the station mean
1896
18.5 C
-0.07 C
1897
18.4 C
-0.19 C
1898
17.6 C
-0.95 C
1901
17.5 C
-1.07 C
1902
18.9 C
+0.32 C
1905
17.6 C
-0.99 C
1906
18.2 C
-0.40 C
1907
18.5 C
-0.04 C
1908
19.1 C
+0.47 C
1910
18.6 C
+0.04 C
1911
20.1 C
+1.49 C
1912
18.2 C
-0.34 C
1913
18.9 C
+0.31 C
1914
18.5 C
-0.08 C
1915
18.5 C
-0.06 C
1916
18.9 C
+0.34 C
1917
18.0 C
-0.58 C
1918
19.1 C
+0.54 C
1919
19.0 C
+0.38 C
1920
18.1 C
-0.47 C
1922
19.6 C
+1.06 C
1924
18.8 C
+0.20 C
1925
19.8 C
+1.19 C
1926
19.1 C
+0.56 C
1927
20.6 C
+2.04 C
1928
19.0 C
+0.38 C
1929
19.1 C
+0.53 C
1930
18.8 C
+0.26 C
1931
18.5 C
-0.04 C
1932
18.1 C
-0.52 C
1933
19.0 C
+0.40 C
1934
18.5 C
-0.04 C
1935
18.4 C
-0.15 C
1936
18.5 C
-0.12 C
1937
18.2 C
-0.39 C
1938
19.0 C
+0.45 C
1939
19.2 C
+0.58 C
1940
17.2 C
-1.36 C
1941
18.7 C
+0.10 C
1942
18.3 C
-0.31 C
1943
18.8 C
+0.17 C
1944
19.1 C
+0.47 C
1945
18.6 C
+0.02 C
1946
19.1 C
+0.54 C
1947
18.2 C
-0.35 C
1948
18.8 C
+0.21 C
1949
19.4 C
+0.77 C
1950
18.7 C
+0.12 C
1951
19.2 C
+0.58 C
1952
18.8 C
+0.18 C
1953
19.1 C
+0.55 C
1954
19.3 C
+0.69 C
1955
18.4 C
-0.21 C
1956
18.3 C
-0.24 C
1957
18.4 C
-0.17 C
1958
17.0 C
-1.55 C
1959
18.0 C
-0.63 C
1960
17.4 C
-1.18 C
1961
17.5 C
-1.05 C
1962
18.4 C
-0.17 C
1965
19.0 C
+0.44 C
1966
18.0 C
-0.55 C
1967
18.0 C
-0.58 C
1968
17.5 C
-1.12 C
1969
18.1 C
-0.44 C
1970
18.3 C
-0.28 C
The fitted trend in annual mean temperature here over 1896 to 1970 is -0.05 C (-0.13 to 0.03) per decade. The interval includes zero, so the trend is not clearly different from zero. In Fahrenheit: -0.10 F (-0.23 to 0.05) per decade. The slope is a straight line fitted to 66 complete years; the brackets give its 95 percent interval.
Fitted temperature trends per decade at Jackson 4 NW
Measure
Per decade (C)
Per decade (F)
Period
Complete years
Reading
Annual mean temperature
-0.05 C (-0.13 to 0.03) per decade
-0.10 F (-0.23 to 0.05) per decade
1896 to 1970
66
Not clearly different from zero
Mean daily maximum
-0.09 C (-0.18 to 0.00) per decade
-0.17 F (-0.33 to 0.00) per decade
1896 to 1970
66
Fall
Mean daily minimum
-0.01 C (-0.09 to 0.07) per decade
-0.03 F (-0.17 to 0.12) per decade
1896 to 1970
66
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 1971
Yearly extremes at Jackson 4 NW: the record and the median year
Measure
Record
Year of the record
Median year
Years with a value
Hottest day (TXx)
41.7 C (107.1 F)
1925
38.1 C (100.5 F)
76
Coldest night (TNn)
-20.6 C (-5.1 F)
1940
-8.9 C (16.0 F)
76
Wettest day (Rx1day)
165.6 mm (6.5 in)
1906
85.4 mm (3.4 in)
76
Wettest five days (Rx5day)
231.5 mm (9.1 in)
1897
129.3 mm (5.1 in)
76
Longest dry spell (CDD)
73 days
1924
22 days
76
Hottest day (TXx)
The hottest day of the year at Jackson 4 NW, 1896 to 1971. The record is 41.7 C (107.1 F) in 1925, marked on the chart; the median year is 38.1 C (100.5 F).
Hottest day (TXx) at Jackson 4 NW by year
Year
Hottest day (TXx)
1896
40.0 C (104.0 F)
1897
38.9 C (102.0 F)
1898
37.2 C (99.0 F)
1899
40.6 C (105.1 F)
1900
38.3 C (100.9 F)
1901
40.0 C (104.0 F)
1902
40.6 C (105.1 F)
1903
36.7 C (98.1 F)
1904
36.7 C (98.1 F)
1905
36.1 C (97.0 F)
1906
38.3 C (100.9 F)
1907
37.2 C (99.0 F)
1908
37.2 C (99.0 F)
1909
40.6 C (105.1 F)
1910
37.2 C (99.0 F)
1911
38.9 C (102.0 F)
1912
36.7 C (98.1 F)
1913
38.3 C (100.9 F)
1914
39.4 C (102.9 F)
1915
38.9 C (102.0 F)
1916
36.7 C (98.1 F)
1917
38.3 C (100.9 F)
1918
39.4 C (102.9 F)
1919
37.8 C (100.0 F)
1920
36.7 C (98.1 F)
1921
38.9 C (102.0 F)
1922
36.7 C (98.1 F)
1923
36.1 C (97.0 F)
1924
40.6 C (105.1 F)
1925
41.7 C (107.1 F)
1926
36.7 C (98.1 F)
1927
39.4 C (102.9 F)
1928
37.8 C (100.0 F)
1929
36.1 C (97.0 F)
1930
41.7 C (107.1 F)
1931
38.9 C (102.0 F)
1932
36.7 C (98.1 F)
1933
37.8 C (100.0 F)
1934
39.4 C (102.9 F)
1935
40.6 C (105.1 F)
1936
40.6 C (105.1 F)
1937
38.3 C (100.9 F)
1938
38.3 C (100.9 F)
1939
40.0 C (104.0 F)
1940
38.3 C (100.9 F)
1941
37.8 C (100.0 F)
1942
37.8 C (100.0 F)
1943
41.1 C (106.0 F)
1944
40.0 C (104.0 F)
1945
36.1 C (97.0 F)
1946
36.1 C (97.0 F)
1947
38.9 C (102.0 F)
1948
38.9 C (102.0 F)
1949
36.7 C (98.1 F)
1950
37.2 C (99.0 F)
1951
39.4 C (102.9 F)
1952
40.0 C (104.0 F)
1953
39.4 C (102.9 F)
1954
40.6 C (105.1 F)
1955
36.1 C (97.0 F)
1956
37.2 C (99.0 F)
1957
35.6 C (96.1 F)
1958
35.0 C (95.0 F)
1959
34.4 C (93.9 F)
1960
37.8 C (100.0 F)
1961
34.4 C (93.9 F)
1962
37.2 C (99.0 F)
1963
38.3 C (100.9 F)
1964
29.4 C (84.9 F)
1965
36.7 C (98.1 F)
1966
38.3 C (100.9 F)
1967
35.0 C (95.0 F)
1968
35.0 C (95.0 F)
1969
38.3 C (100.9 F)
1970
37.8 C (100.0 F)
1971
31.1 C (88.0 F)
Coldest night (TNn)
The coldest night of the year at Jackson 4 NW, 1896 to 1971. The record is -20.6 C (-5.1 F) in 1940, marked on the chart; the median year is -8.9 C (16.0 F).
Coldest night (TNn) at Jackson 4 NW by year
Year
Coldest night (TNn)
1896
-8.9 C (16.0 F)
1897
-10.0 C (14.0 F)
1898
-7.8 C (18.0 F)
1899
-5.0 C (23.0 F)
1900
-9.4 C (15.1 F)
1901
-11.1 C (12.0 F)
1902
-7.2 C (19.0 F)
1903
-9.4 C (15.1 F)
1904
-16.1 C (3.0 F)
1905
-12.2 C (10.0 F)
1906
-5.6 C (21.9 F)
1907
-6.1 C (21.0 F)
1908
-6.1 C (21.0 F)
1909
-9.4 C (15.1 F)
1910
-8.3 C (17.1 F)
1911
-11.1 C (12.0 F)
1912
-10.6 C (12.9 F)
1913
-4.4 C (24.1 F)
1914
-8.3 C (17.1 F)
1915
-5.6 C (21.9 F)
1916
-7.8 C (18.0 F)
1917
-12.2 C (10.0 F)
1918
-15.6 C (3.9 F)
1919
-15.6 C (3.9 F)
1920
-6.1 C (21.0 F)
1921
-2.2 C (28.0 F)
1922
-2.8 C (27.0 F)
1923
-6.1 C (21.0 F)
1924
-12.2 C (10.0 F)
1925
-10.6 C (12.9 F)
1926
-6.7 C (19.9 F)
1927
-8.3 C (17.1 F)
1928
-10.6 C (12.9 F)
1929
-13.3 C (8.1 F)
1930
-12.2 C (10.0 F)
1931
-6.1 C (21.0 F)
1932
-8.9 C (16.0 F)
1933
-11.1 C (12.0 F)
1934
-8.3 C (17.1 F)
1935
-10.0 C (14.0 F)
1936
-8.9 C (16.0 F)
1937
-10.0 C (14.0 F)
1938
-8.9 C (16.0 F)
1939
-3.9 C (25.0 F)
1940
-20.6 C (-5.1 F)
1941
-5.0 C (23.0 F)
1942
-12.2 C (10.0 F)
1943
-9.4 C (15.1 F)
1944
-6.7 C (19.9 F)
1945
-8.9 C (16.0 F)
1946
-6.7 C (19.9 F)
1947
-8.3 C (17.1 F)
1948
-17.2 C (1.0 F)
1949
-7.8 C (18.0 F)
1950
-7.8 C (18.0 F)
1951
-17.2 C (1.0 F)
1952
-5.0 C (23.0 F)
1953
-6.7 C (19.9 F)
1954
-5.6 C (21.9 F)
1955
-8.9 C (16.0 F)
1956
-7.2 C (19.0 F)
1957
-8.9 C (16.0 F)
1958
-9.4 C (15.1 F)
1959
-8.9 C (16.0 F)
1960
-12.2 C (10.0 F)
1961
-7.2 C (19.0 F)
1962
-18.3 C (-0.9 F)
1963
-15.0 C (5.0 F)
1964
-6.1 C (21.0 F)
1965
-9.4 C (15.1 F)
1966
-13.3 C (8.1 F)
1967
-7.8 C (18.0 F)
1968
-7.8 C (18.0 F)
1969
-10.6 C (12.9 F)
1970
-11.1 C (12.0 F)
1971
-8.9 C (16.0 F)
Wettest day (Rx1day)
The wettest day of the year at Jackson 4 NW, 1896 to 1971. The record is 165.6 mm (6.5 in) in 1906, marked on the chart; the median year is 85.4 mm (3.4 in).
Wettest day (Rx1day) at Jackson 4 NW by year
Year
Wettest day (Rx1day)
1896
144.5 mm (5.7 in)
1897
106.7 mm (4.2 in)
1898
57.2 mm (2.3 in)
1899
49.5 mm (1.9 in)
1900
101.6 mm (4.0 in)
1901
101.6 mm (4.0 in)
1902
159.5 mm (6.3 in)
1903
58.4 mm (2.3 in)
1904
48.3 mm (1.9 in)
1905
102.6 mm (4.0 in)
1906
165.6 mm (6.5 in)
1907
50.8 mm (2.0 in)
1908
107.7 mm (4.2 in)
1909
99.1 mm (3.9 in)
1910
106.4 mm (4.2 in)
1911
101.3 mm (4.0 in)
1912
68.8 mm (2.7 in)
1913
74.9 mm (2.9 in)
1914
93.7 mm (3.7 in)
1915
94.0 mm (3.7 in)
1916
67.8 mm (2.7 in)
1917
96.0 mm (3.8 in)
1918
84.8 mm (3.3 in)
1919
70.9 mm (2.8 in)
1920
74.7 mm (2.9 in)
1921
160.0 mm (6.3 in)
1922
78.7 mm (3.1 in)
1923
69.1 mm (2.7 in)
1924
52.8 mm (2.1 in)
1925
111.8 mm (4.4 in)
1926
105.4 mm (4.1 in)
1927
79.2 mm (3.1 in)
1928
115.6 mm (4.6 in)
1929
88.4 mm (3.5 in)
1930
92.7 mm (3.6 in)
1931
78.7 mm (3.1 in)
1932
74.9 mm (2.9 in)
1933
126.5 mm (5.0 in)
1934
131.8 mm (5.2 in)
1935
75.4 mm (3.0 in)
1936
81.5 mm (3.2 in)
1937
55.6 mm (2.2 in)
1938
74.2 mm (2.9 in)
1939
61.5 mm (2.4 in)
1940
83.3 mm (3.3 in)
1941
81.5 mm (3.2 in)
1942
145.5 mm (5.7 in)
1943
71.9 mm (2.8 in)
1944
78.0 mm (3.1 in)
1945
98.8 mm (3.9 in)
1946
101.9 mm (4.0 in)
1947
61.0 mm (2.4 in)
1948
92.5 mm (3.6 in)
1949
86.4 mm (3.4 in)
1950
90.7 mm (3.6 in)
1951
93.7 mm (3.7 in)
1952
53.3 mm (2.1 in)
1953
123.2 mm (4.9 in)
1954
105.9 mm (4.2 in)
1955
93.0 mm (3.7 in)
1956
75.4 mm (3.0 in)
1957
100.8 mm (4.0 in)
1958
80.3 mm (3.2 in)
1959
80.0 mm (3.1 in)
1960
79.0 mm (3.1 in)
1961
91.4 mm (3.6 in)
1962
85.9 mm (3.4 in)
1963
45.0 mm (1.8 in)
1964
100.3 mm (3.9 in)
1965
57.7 mm (2.3 in)
1966
109.7 mm (4.3 in)
1967
75.7 mm (3.0 in)
1968
86.6 mm (3.4 in)
1969
77.2 mm (3.0 in)
1970
58.2 mm (2.3 in)
1971
51.3 mm (2.0 in)
Wettest five days (Rx5day)
The wettest five days of the year at Jackson 4 NW, 1896 to 1971. The record is 231.5 mm (9.1 in) in 1897, marked on the chart; the median year is 129.3 mm (5.1 in).
Wettest five days (Rx5day) at Jackson 4 NW by year
Year
Wettest five days (Rx5day)
1896
211.5 mm (8.3 in)
1897
231.5 mm (9.1 in)
1898
107.7 mm (4.2 in)
1899
69.8 mm (2.7 in)
1900
172.7 mm (6.8 in)
1901
129.4 mm (5.1 in)
1902
211.1 mm (8.3 in)
1903
138.4 mm (5.4 in)
1904
80.0 mm (3.1 in)
1905
134.6 mm (5.3 in)
1906
194.0 mm (7.6 in)
1907
90.9 mm (3.6 in)
1908
121.9 mm (4.8 in)
1909
158.5 mm (6.2 in)
1910
111.2 mm (4.4 in)
1911
122.5 mm (4.8 in)
1912
127.2 mm (5.0 in)
1913
160.8 mm (6.3 in)
1914
173.0 mm (6.8 in)
1915
129.1 mm (5.1 in)
1916
86.4 mm (3.4 in)
1917
115.8 mm (4.6 in)
1918
112.3 mm (4.4 in)
1919
99.0 mm (3.9 in)
1920
119.4 mm (4.7 in)
1921
228.1 mm (9.0 in)
1922
116.1 mm (4.6 in)
1923
165.9 mm (6.5 in)
1924
64.7 mm (2.5 in)
1925
128.3 mm (5.1 in)
1926
174.7 mm (6.9 in)
1927
106.1 mm (4.2 in)
1928
139.7 mm (5.5 in)
1929
140.8 mm (5.5 in)
1930
145.3 mm (5.7 in)
1931
115.1 mm (4.5 in)
1932
164.8 mm (6.5 in)
1933
131.1 mm (5.2 in)
1934
136.2 mm (5.4 in)
1935
133.1 mm (5.2 in)
1936
142.0 mm (5.6 in)
1937
80.0 mm (3.1 in)
1938
123.4 mm (4.9 in)
1939
114.8 mm (4.5 in)
1940
157.8 mm (6.2 in)
1941
89.9 mm (3.5 in)
1942
212.1 mm (8.4 in)
1943
88.2 mm (3.5 in)
1944
125.3 mm (4.9 in)
1945
164.9 mm (6.5 in)
1946
145.9 mm (5.7 in)
1947
133.7 mm (5.3 in)
1948
175.6 mm (6.9 in)
1949
165.4 mm (6.5 in)
1950
139.7 mm (5.5 in)
1951
117.9 mm (4.6 in)
1952
69.3 mm (2.7 in)
1953
143.3 mm (5.6 in)
1954
169.6 mm (6.7 in)
1955
148.9 mm (5.9 in)
1956
127.8 mm (5.0 in)
1957
110.8 mm (4.4 in)
1958
158.9 mm (6.3 in)
1959
177.8 mm (7.0 in)
1960
145.1 mm (5.7 in)
1961
128.6 mm (5.1 in)
1962
107.2 mm (4.2 in)
1963
53.1 mm (2.1 in)
1964
150.6 mm (5.9 in)
1965
92.9 mm (3.7 in)
1966
168.2 mm (6.6 in)
1967
124.9 mm (4.9 in)
1968
86.6 mm (3.4 in)
1969
110.1 mm (4.3 in)
1970
107.2 mm (4.2 in)
1971
94.0 mm (3.7 in)
Longest dry spell (CDD)
The longest dry spell of the year at Jackson 4 NW, 1896 to 1971. The record is 73 days in 1924, marked on the chart; the median year is 22 days.
Longest dry spell (CDD) at Jackson 4 NW by year
Year
Longest dry spell (CDD)
1896
22 days
1897
27 days
1898
17 days
1899
37 days
1900
26 days
1901
22 days
1902
23 days
1903
39 days
1904
39 days
1905
21 days
1906
34 days
1907
17 days
1908
24 days
1909
22 days
1910
15 days
1911
19 days
1912
13 days
1913
21 days
1914
24 days
1915
29 days
1916
25 days
1917
23 days
1918
26 days
1919
14 days
1920
24 days
1921
25 days
1922
19 days
1923
26 days
1924
73 days
1925
25 days
1926
14 days
1927
21 days
1928
22 days
1929
17 days
1930
32 days
1931
23 days
1932
15 days
1933
20 days
1934
21 days
1935
19 days
1936
26 days
1937
21 days
1938
21 days
1939
19 days
1940
34 days
1941
16 days
1942
19 days
1943
22 days
1944
28 days
1945
14 days
1946
22 days
1947
20 days
1948
20 days
1949
33 days
1950
16 days
1951
29 days
1952
51 days
1953
30 days
1954
17 days
1955
21 days
1956
29 days
1957
15 days
1958
26 days
1959
19 days
1960
18 days
1961
25 days
1962
19 days
1963
18 days
1964
12 days
1965
28 days
1966
20 days
1967
25 days
1968
24 days
1969
21 days
1970
34 days
1971
15 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
66 years with a frost
Across 66 years with a frost, the median last spring frost at Jackson 4 NW falls on 16 March and the median first autumn frost on 9 November, which leaves a median of 237 days between them.
In 1939 to 1970 the median growing season was 235 days. That is 5 days fewer than in 1896 to 1932.
Fitted over all years, the growing season changes by -0.2 days per decade at this station.
Frost dates and growing season at Jackson 4 NW
Measure
Median, all years
Earliest period (1896 to 1932)
Recent period (1939 to 1970)
Recent against earliest
Fitted trend
Last spring frost
16 March
15 March
16 March
1 day later
+0.6 days per decade
First autumn frost
9 November
12 November
9 November
3 days earlier
+0.3 days per decade
Growing days
237 days
240 days
235 days
5 days fewer
-0.2 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
72 years, 1896 to 1970
A day with at least 85.7 mm (3.4 in) of rain is expected about once in 2 years. A day with at least 170.2 mm (6.7 in) of rain is expected about once in 100 years.
Rainfall return levels at Jackson 4 NW: the daily rain expected about once in a given number of years
Expected about once in
A day with at least
Note
2 years
85.7 mm (3.4 in)
5 years
108.8 mm (4.3 in)
10 years
123.9 mm (4.9 in)
25 years
142.8 mm (5.6 in)
50 years
156.6 mm (6.2 in)
100 years
170.2 mm (6.7 in)
Longer than the 72 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, 72 years of values from 1896 to 1970.
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: 165.6 mm (6.5 in) in 1906; 160.0 mm (6.3 in) in 1921; 159.5 mm (6.3 in) in 1902.
Station Changes
2 suspected
2 changes were suspected in the annual mean temperature of Jackson 4 NW, at 1931 and 1965. Each is measured against neighbouring stations.
Relative to 5 neighbouring stations, the station's annual mean temperature from 1931 ran 0.3 C (0.6 F) lower than in the years before (likely change).
Relative to 5 neighbouring stations, the station's annual mean temperature from 1965 ran 0.5 C (0.9 F) higher than in the years before (possible change).
Suspected changes in the annual mean temperature at Jackson 4 NW, against neighbouring stations
Year
Shift (C)
Shift (F)
Strength
Neighbours
1931
-0.3
-0.6
likely
5
1965
+0.5
+0.9
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 Jackson 4 NW standing records by year: CSV or JSON. Field meanings are on the data page.
Data for Jackson 4 NW 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 2026-10-16 (16 October 2026). Records are computed by this site and are not official.