Record highRecord low2026 daily maximum2026 daily minimum
The band shows the record high and record low for each calendar day at Chatham 2. 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 Chatham 2, with 2026 drawn through them
Month
Highest record high
Lowest record low
2026 highest maximum
2026 lowest minimum
Jan
17.8 C (64.0 F)
-27.2 C (-17.0 F)
n/a
n/a
Feb
17.8 C (64.0 F)
-27.8 C (-18.0 F)
n/a
n/a
Mar
26.7 C (80.1 F)
-20.0 C (-4.0 F)
n/a
n/a
Apr
32.8 C (91.0 F)
-13.9 C (7.0 F)
n/a
n/a
May
36.1 C (97.0 F)
-3.3 C (26.1 F)
n/a
n/a
Jun
37.8 C (100.0 F)
0.6 C (33.1 F)
n/a
n/a
Jul
39.4 C (102.9 F)
2.8 C (37.0 F)
n/a
n/a
Aug
41.1 C (106.0 F)
2.8 C (37.0 F)
n/a
n/a
Sep
36.7 C (98.1 F)
-1.7 C (28.9 F)
n/a
n/a
Oct
32.2 C (90.0 F)
-7.2 C (19.0 F)
n/a
n/a
Nov
26.1 C (79.0 F)
-14.4 C (6.1 F)
n/a
n/a
Dec
16.7 C (62.1 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 Chatham 2 still stand. 1895 holds the most, with 56.
Standing records at Chatham 2 by the year they were set
Year set
Standing records
1889
28
1890
42
1891
17
1892
10
1893
38
1894
35
1895
56
1896
55
1897
32
1898
34
1899
37
1900
36
1901
30
1902
26
1903
41
1904
35
1905
22
1906
27
1907
27
1908
22
1909
32
1910
26
1911
28
1912
24
1913
29
1914
37
1915
28
1916
39
1917
42
1918
47
1919
30
1920
37
1921
26
1922
25
1923
28
1924
27
1925
42
1926
20
1927
26
1928
19
1929
30
1930
44
1931
35
1932
23
1933
38
1934
24
1935
8
All-Time Record Progression
1 new records
1 all-time records were set at Chatham 2 between 4 July 1943 and 4 July 1943. Each dot is a new record.
When Chatham 2 set new all-time records
Date
Kind
Detail
1943-07-04
Record daily precipitation
Record daily precipitation 98.6 mm (3.9 in)
Wettest Day of Each Month
Jul: 98.6 mm (3.9 in)
The wettest day on record for each calendar month at Chatham 2. The most was 98.6 mm (3.9 in) on 4 July 1943.
Record daily precipitation for each month at Chatham 2
Month
Record daily precipitation (mm)
Date
Jan
39.4 mm (1.6 in)
14 January 1887
Feb
65.3 mm (2.6 in)
8 February 1887
Mar
48.3 mm (1.9 in)
6 March 1887
Apr
66.0 mm (2.6 in)
29 April 1909
May
64.0 mm (2.5 in)
27 May 1916
Jun
66.8 mm (2.6 in)
7 June 1941
Jul
98.6 mm (3.9 in)
4 July 1943
Aug
88.9 mm (3.5 in)
12 August 1908
Sep
67.3 mm (2.6 in)
14 September 1911
Oct
97.3 mm (3.8 in)
1 October 1945
Nov
68.8 mm (2.7 in)
27 November 1887
Dec
35.1 mm (1.4 in)
13 December 1909
Period of Record Coverage
1889 to 1935
Complete yearUnder 90 percent of days
47 years of record at Chatham 2, 1889 to 1935. 4 years have data for under 90 percent of days and are left out of rankings: 1889, 1891, 1892, 1935.
Cooler than the station meanWarmer than the station mean
One stripe for each of 41 complete years at Chatham 2, 1890 to 1934. Blue stripes are years cooler than the station's own mean of 9.1 C (48.3 F); red stripes are warmer. The coolest year was 1917, at 7.2 C (45.0 F), and the warmest was 1931, at 11.2 C (52.2 F). The strongest colour marks a difference of 2.2 C (4.0 F).
Annual mean temperature at Chatham 2 as warming stripes, 1890 to 1934
Year
Annual mean temperature
Difference from the station mean
1890
8.5 C
-0.56 C
1893
7.6 C
-1.47 C
1894
9.3 C
+0.22 C
1895
7.8 C
-1.30 C
1896
8.6 C
-0.42 C
1897
8.6 C
-0.51 C
1898
9.3 C
+0.20 C
1899
8.8 C
-0.31 C
1900
9.2 C
+0.12 C
1901
8.2 C
-0.87 C
1902
8.7 C
-0.34 C
1903
8.6 C
-0.43 C
1904
7.3 C
-1.76 C
1905
8.4 C
-0.66 C
1906
9.6 C
+0.50 C
1907
8.2 C
-0.84 C
1908
9.6 C
+0.49 C
1909
9.3 C
+0.23 C
1910
8.9 C
-0.17 C
1911
9.6 C
+0.54 C
1912
7.9 C
-1.16 C
1913
9.8 C
+0.76 C
1914
9.2 C
+0.11 C
1915
9.3 C
+0.21 C
1916
9.2 C
+0.14 C
1917
7.2 C
-1.82 C
1918
9.4 C
+0.34 C
1919
10.3 C
+1.24 C
1920
9.2 C
+0.09 C
1922
10.4 C
+1.37 C
1924
8.3 C
-0.72 C
1925
9.2 C
+0.09 C
1926
8.4 C
-0.69 C
1927
10.0 C
+0.91 C
1928
9.5 C
+0.46 C
1929
9.0 C
-0.07 C
1930
10.0 C
+0.93 C
1931
11.2 C
+2.17 C
1932
10.2 C
+1.12 C
1933
10.5 C
+1.43 C
1934
9.6 C
+0.53 C
The annual mean temperature here has risen by 0.4 C (0.2 to 0.6) per decade over 1890 to 1934. In Fahrenheit: 0.7 F (0.4 to 1.0) 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 Chatham 2
Measure
Per decade (C)
Per decade (F)
Period
Complete years
Reading
Annual mean temperature
0.4 C (0.2 to 0.6) per decade
0.7 F (0.4 to 1.0) per decade
1890 to 1934
41
Rise
Mean daily maximum
0.4 C (0.2 to 0.7) per decade
0.8 F (0.4 to 1.2) per decade
1890 to 1934
41
Rise
Mean daily minimum
0.3 C (0.2 to 0.5) per decade
0.6 F (0.3 to 0.9) per decade
1890 to 1934
41
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 1946
Yearly extremes at Chatham 2: the record and the median year
Measure
Record
Year of the record
Median year
Years with a value
Hottest day (TXx)
41.1 C (106.0 F)
1918
36.1 C (97.0 F)
47
Coldest night (TNn)
-27.8 C (-18.0 F)
1912
-22.2 C (-8.0 F)
47
Wettest day (Rx1day)
98.6 mm (3.9 in)
1943
39.1 mm (1.5 in)
65
Wettest five days (Rx5day)
115.1 mm (4.5 in)
1946
57.7 mm (2.3 in)
65
Longest dry spell (CDD)
41 days
1908
20 days
65
Hottest day (TXx)
The hottest day of the year at Chatham 2, 1879 to 1946. The record is 41.1 C (106.0 F) in 1918, marked on the chart; the median year is 36.1 C (97.0 F).
Hottest day (TXx) at Chatham 2 by year
Year
Hottest day (TXx)
1879
n/a
1883
n/a
1884
n/a
1885
n/a
1886
n/a
1887
n/a
1888
n/a
1889
31.7 C (89.1 F)
1890
34.4 C (93.9 F)
1891
36.7 C (98.1 F)
1892
23.3 C (73.9 F)
1893
35.0 C (95.0 F)
1894
36.1 C (97.0 F)
1895
35.0 C (95.0 F)
1896
33.3 C (91.9 F)
1897
35.0 C (95.0 F)
1898
35.6 C (96.1 F)
1899
34.4 C (93.9 F)
1900
35.0 C (95.0 F)
1901
36.7 C (98.1 F)
1902
33.3 C (91.9 F)
1903
33.9 C (93.0 F)
1904
36.7 C (98.1 F)
1905
35.0 C (95.0 F)
1906
35.0 C (95.0 F)
1907
33.3 C (91.9 F)
1908
35.6 C (96.1 F)
1909
35.6 C (96.1 F)
1910
36.1 C (97.0 F)
1911
39.4 C (102.9 F)
1912
35.0 C (95.0 F)
1913
36.1 C (97.0 F)
1914
36.1 C (97.0 F)
1915
33.3 C (91.9 F)
1916
39.4 C (102.9 F)
1917
37.8 C (100.0 F)
1918
41.1 C (106.0 F)
1919
37.2 C (99.0 F)
1920
35.0 C (95.0 F)
1921
38.3 C (100.9 F)
1922
37.8 C (100.0 F)
1923
37.2 C (99.0 F)
1924
36.1 C (97.0 F)
1925
37.8 C (100.0 F)
1926
37.2 C (99.0 F)
1927
36.1 C (97.0 F)
1928
33.9 C (93.0 F)
1929
35.0 C (95.0 F)
1930
38.3 C (100.9 F)
1931
37.8 C (100.0 F)
1932
36.1 C (97.0 F)
1933
38.3 C (100.9 F)
1934
39.4 C (102.9 F)
1935
19.4 C (66.9 F)
1936
n/a
1937
n/a
1938
n/a
1939
n/a
1940
n/a
1941
n/a
1942
n/a
1943
n/a
1944
n/a
1945
n/a
1946
n/a
Coldest night (TNn)
The coldest night of the year at Chatham 2, 1879 to 1946. The record is -27.8 C (-18.0 F) in 1912, marked on the chart; the median year is -22.2 C (-8.0 F).
Coldest night (TNn) at Chatham 2 by year
Year
Coldest night (TNn)
1879
n/a
1883
n/a
1884
n/a
1885
n/a
1886
n/a
1887
n/a
1888
n/a
1889
-11.7 C (10.9 F)
1890
-18.9 C (-2.0 F)
1891
-15.6 C (3.9 F)
1892
-17.8 C (0.0 F)
1893
-25.6 C (-14.1 F)
1894
-21.7 C (-7.1 F)
1895
-26.7 C (-16.1 F)
1896
-21.7 C (-7.1 F)
1897
-25.0 C (-13.0 F)
1898
-20.0 C (-4.0 F)
1899
-25.6 C (-14.1 F)
1900
-21.7 C (-7.1 F)
1901
-20.6 C (-5.1 F)
1902
-20.6 C (-5.1 F)
1903
-21.1 C (-6.0 F)
1904
-23.3 C (-9.9 F)
1905
-26.1 C (-15.0 F)
1906
-22.2 C (-8.0 F)
1907
-23.3 C (-9.9 F)
1908
-22.8 C (-9.0 F)
1909
-22.2 C (-8.0 F)
1910
-18.9 C (-2.0 F)
1911
-17.8 C (0.0 F)
1912
-27.8 C (-18.0 F)
1913
-18.9 C (-2.0 F)
1914
-23.3 C (-9.9 F)
1915
-27.2 C (-17.0 F)
1916
-22.8 C (-9.0 F)
1917
-26.7 C (-16.1 F)
1918
-26.7 C (-16.1 F)
1919
-17.2 C (1.0 F)
1920
-23.3 C (-9.9 F)
1921
-13.9 C (7.0 F)
1922
-18.9 C (-2.0 F)
1923
-18.3 C (-0.9 F)
1924
-22.2 C (-8.0 F)
1925
-22.8 C (-9.0 F)
1926
-20.0 C (-4.0 F)
1927
-22.8 C (-9.0 F)
1928
-17.2 C (1.0 F)
1929
-27.2 C (-17.0 F)
1930
-22.2 C (-8.0 F)
1931
-15.6 C (3.9 F)
1932
-18.9 C (-2.0 F)
1933
-22.2 C (-8.0 F)
1934
-27.2 C (-17.0 F)
1935
-21.7 C (-7.1 F)
1936
n/a
1937
n/a
1938
n/a
1939
n/a
1940
n/a
1941
n/a
1942
n/a
1943
n/a
1944
n/a
1945
n/a
1946
n/a
Wettest day (Rx1day)
The wettest day of the year at Chatham 2, 1879 to 1946. The record is 98.6 mm (3.9 in) in 1943, marked on the chart; the median year is 39.1 mm (1.5 in).
Wettest day (Rx1day) at Chatham 2 by year
Year
Wettest day (Rx1day)
1879
6.9 mm (0.27 in)
1883
34.0 mm (1.3 in)
1884
37.8 mm (1.5 in)
1885
41.4 mm (1.6 in)
1886
38.1 mm (1.5 in)
1887
68.8 mm (2.7 in)
1888
45.2 mm (1.8 in)
1889
45.7 mm (1.8 in)
1890
80.5 mm (3.2 in)
1891
47.8 mm (1.9 in)
1892
23.4 mm (0.9 in)
1893
37.3 mm (1.5 in)
1894
36.3 mm (1.4 in)
1895
29.0 mm (1.1 in)
1896
80.3 mm (3.2 in)
1897
31.8 mm (1.3 in)
1898
36.8 mm (1.4 in)
1899
26.2 mm (1.0 in)
1900
54.9 mm (2.2 in)
1901
33.0 mm (1.3 in)
1902
46.2 mm (1.8 in)
1903
39.1 mm (1.5 in)
1904
30.5 mm (1.2 in)
1905
38.9 mm (1.5 in)
1906
24.1 mm (0.9 in)
1907
43.2 mm (1.7 in)
1908
88.9 mm (3.5 in)
1909
66.0 mm (2.6 in)
1910
41.9 mm (1.6 in)
1911
67.3 mm (2.6 in)
1912
45.7 mm (1.8 in)
1913
39.6 mm (1.6 in)
1914
40.4 mm (1.6 in)
1915
39.4 mm (1.6 in)
1916
64.0 mm (2.5 in)
1917
37.3 mm (1.5 in)
1918
22.9 mm (0.9 in)
1919
27.9 mm (1.1 in)
1920
38.1 mm (1.5 in)
1921
57.2 mm (2.3 in)
1922
50.0 mm (2.0 in)
1923
31.8 mm (1.3 in)
1924
39.6 mm (1.6 in)
1925
54.6 mm (2.1 in)
1926
62.2 mm (2.4 in)
1927
47.0 mm (1.9 in)
1928
34.8 mm (1.4 in)
1929
33.0 mm (1.3 in)
1930
19.8 mm (0.8 in)
1931
37.3 mm (1.5 in)
1932
49.5 mm (1.9 in)
1933
39.1 mm (1.5 in)
1934
28.2 mm (1.1 in)
1935
26.4 mm (1.0 in)
1936
26.7 mm (1.1 in)
1937
38.1 mm (1.5 in)
1938
52.8 mm (2.1 in)
1939
38.1 mm (1.5 in)
1940
37.1 mm (1.5 in)
1941
66.8 mm (2.6 in)
1942
40.6 mm (1.6 in)
1943
98.6 mm (3.9 in)
1944
25.4 mm (1.0 in)
1945
97.3 mm (3.8 in)
1946
64.8 mm (2.6 in)
Wettest five days (Rx5day)
The wettest five days of the year at Chatham 2, 1879 to 1946. The record is 115.1 mm (4.5 in) in 1946, marked on the chart; the median year is 57.7 mm (2.3 in).
Wettest five days (Rx5day) at Chatham 2 by year
Year
Wettest five days (Rx5day)
1879
10.9 mm (0.4 in)
1883
51.8 mm (2.0 in)
1884
69.8 mm (2.7 in)
1885
50.6 mm (2.0 in)
1886
45.7 mm (1.8 in)
1887
96.0 mm (3.8 in)
1888
55.1 mm (2.2 in)
1889
45.7 mm (1.8 in)
1890
87.6 mm (3.4 in)
1891
79.3 mm (3.1 in)
1892
33.6 mm (1.3 in)
1893
68.8 mm (2.7 in)
1894
78.5 mm (3.1 in)
1895
51.5 mm (2.0 in)
1896
100.1 mm (3.9 in)
1897
44.7 mm (1.8 in)
1898
70.4 mm (2.8 in)
1899
54.5 mm (2.1 in)
1900
83.9 mm (3.3 in)
1901
46.8 mm (1.8 in)
1902
83.8 mm (3.3 in)
1903
71.8 mm (2.8 in)
1904
44.0 mm (1.7 in)
1905
49.5 mm (1.9 in)
1906
45.7 mm (1.8 in)
1907
101.7 mm (4.0 in)
1908
112.8 mm (4.4 in)
1909
66.0 mm (2.6 in)
1910
73.2 mm (2.9 in)
1911
73.1 mm (2.9 in)
1912
45.7 mm (1.8 in)
1913
58.7 mm (2.3 in)
1914
57.4 mm (2.3 in)
1915
50.9 mm (2.0 in)
1916
104.1 mm (4.1 in)
1917
61.4 mm (2.4 in)
1918
40.7 mm (1.6 in)
1919
36.8 mm (1.4 in)
1920
47.3 mm (1.9 in)
1921
62.3 mm (2.5 in)
1922
52.3 mm (2.1 in)
1923
48.0 mm (1.9 in)
1924
57.4 mm (2.3 in)
1925
61.0 mm (2.4 in)
1926
110.2 mm (4.3 in)
1927
65.0 mm (2.6 in)
1928
69.6 mm (2.7 in)
1929
52.6 mm (2.1 in)
1930
33.8 mm (1.3 in)
1931
52.3 mm (2.1 in)
1932
76.2 mm (3.0 in)
1933
39.1 mm (1.5 in)
1934
36.1 mm (1.4 in)
1935
37.8 mm (1.5 in)
1936
53.1 mm (2.1 in)
1937
57.7 mm (2.3 in)
1938
66.8 mm (2.6 in)
1939
74.2 mm (2.9 in)
1940
60.5 mm (2.4 in)
1941
74.7 mm (2.9 in)
1942
54.1 mm (2.1 in)
1943
106.7 mm (4.2 in)
1944
48.7 mm (1.9 in)
1945
99.9 mm (3.9 in)
1946
115.1 mm (4.5 in)
Longest dry spell (CDD)
The longest dry spell of the year at Chatham 2, 1879 to 1946. The record is 41 days in 1908, marked on the chart; the median year is 20 days.
Longest dry spell (CDD) at Chatham 2 by year
Year
Longest dry spell (CDD)
1879
5 days
1883
14 days
1884
21 days
1885
19 days
1886
18 days
1887
25 days
1888
26 days
1889
26 days
1890
18 days
1891
13 days
1892
10 days
1893
15 days
1894
21 days
1895
15 days
1896
11 days
1897
19 days
1898
21 days
1899
28 days
1900
15 days
1901
19 days
1902
24 days
1903
31 days
1904
26 days
1905
29 days
1906
18 days
1907
37 days
1908
41 days
1909
19 days
1910
30 days
1911
20 days
1912
24 days
1913
24 days
1914
26 days
1915
23 days
1916
35 days
1917
21 days
1918
22 days
1919
18 days
1920
17 days
1921
20 days
1922
22 days
1923
22 days
1924
38 days
1925
17 days
1926
14 days
1927
26 days
1928
14 days
1929
23 days
1930
25 days
1931
21 days
1932
20 days
1933
18 days
1934
28 days
1935
19 days
1936
22 days
1937
16 days
1938
20 days
1939
15 days
1940
13 days
1941
22 days
1942
20 days
1943
20 days
1944
23 days
1945
12 days
1946
13 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 Chatham 2 falls on 5 May and the median first autumn frost on 14 October, which leaves a median of 163 days between them.
Fitted over all years, the growing season changes by +3.3 days per decade at this station.
Frost dates and growing season at Chatham 2
Measure
Median, all years
Earliest period
Recent period (1903 to 1934)
Recent against earliest
Fitted trend
Last spring frost
5 May
n/a
4 May
n/a
+0.6 days per decade
First autumn frost
14 October
n/a
17 October
n/a
+3.9 days per decade
Growing days
163 days
n/a
165 days
n/a
+3.3 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
57 years, 1884 to 1944
A day with at least 39.8 mm (1.6 in) of rain is expected about once in 2 years. A day with at least 109.0 mm (4.3 in) of rain is expected about once in 100 years.
Rainfall return levels at Chatham 2: the daily rain expected about once in a given number of years
Expected about once in
A day with at least
Note
2 years
39.8 mm (1.6 in)
5 years
54.2 mm (2.1 in)
10 years
65.1 mm (2.6 in)
25 years
81.0 mm (3.2 in)
50 years
94.3 mm (3.7 in)
100 years
109.0 mm (4.3 in)
Longer than the 57 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, 57 years of values from 1884 to 1944.
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: 98.6 mm (3.9 in) in 1943; 88.9 mm (3.5 in) in 1908; 80.5 mm (3.2 in) in 1890.
Station Changes
1 suspected
One change was suspected in the annual mean temperature of Chatham 2, at 1914. Each is measured against neighbouring stations.
Relative to 5 neighbouring stations, the station's annual mean temperature from 1914 ran 0.4 C (0.7 F) higher than in the years before (likely change).
Suspected changes in the annual mean temperature at Chatham 2, against neighbouring stations
Year
Shift (C)
Shift (F)
Strength
Neighbours
1914
+0.4
+0.7
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 Chatham 2 standing records by year: CSV or JSON. Field meanings are on the data page.
Data for Chatham 2 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.