Record highRecord low2026 daily maximum2026 daily minimum
The band shows the record high and record low for each calendar day at Port Arthur. 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 Port Arthur, with 2026 drawn through them
Month
Highest record high
Lowest record low
2026 highest maximum
2026 lowest minimum
Jan
8.9 C (48.0 F)
-40.0 C (-40.0 F)
n/a
n/a
Feb
11.1 C (52.0 F)
-39.4 C (-38.9 F)
n/a
n/a
Mar
18.3 C (64.9 F)
-36.1 C (-33.0 F)
n/a
n/a
Apr
26.1 C (79.0 F)
-23.3 C (-9.9 F)
n/a
n/a
May
32.2 C (90.0 F)
-8.9 C (16.0 F)
n/a
n/a
Jun
36.1 C (97.0 F)
-2.2 C (28.0 F)
n/a
n/a
Jul
40.0 C (104.0 F)
2.2 C (36.0 F)
n/a
n/a
Aug
35.0 C (95.0 F)
-0.6 C (30.9 F)
n/a
n/a
Sep
31.7 C (89.1 F)
-6.7 C (19.9 F)
n/a
n/a
Oct
27.2 C (81.0 F)
-15.6 C (3.9 F)
n/a
n/a
Nov
20.6 C (69.1 F)
-30.6 C (-23.1 F)
n/a
n/a
Dec
10.6 C (51.1 F)
-38.9 C (-38.0 F)
n/a
n/a
Which Years Hold Standing Records
1,464 standing records
Year with most
1,464 records at Port Arthur still stand. 1879 holds the most, with 41.
Standing records at Port Arthur by the year they were set
Year set
Standing records
1877
28
1878
32
1879
41
1880
36
1881
21
1882
21
1883
32
1884
27
1885
40
1886
22
1887
22
1888
30
1889
26
1890
19
1891
28
1892
14
1893
12
1894
14
1895
20
1896
23
1897
25
1898
15
1899
24
1900
25
1901
14
1902
14
1903
23
1904
10
1905
13
1906
23
1907
17
1908
13
1909
25
1910
29
1911
16
1912
22
1913
28
1914
27
1915
26
1916
18
1917
14
1918
12
1919
22
1920
19
1921
27
1922
23
1923
30
1924
10
1925
24
1926
22
1927
16
1928
26
1929
17
1930
25
1931
37
1932
20
1933
19
1934
23
1935
22
1936
34
1937
16
1938
16
1939
27
1940
22
1941
26
All-Time Record Progression
8 new records
8 all-time records were set at Port Arthur between 28 June 1910 and 26 November 1940. Each dot is a new record.
When Port Arthur set new all-time records
Date
Kind
Detail
1910-06-28
Record high maximum temperature
Record high maximum temperature 36.1 C (97.0 F)
1916-07-29
Record high maximum temperature
Record high maximum temperature 37.2 C (99.0 F)
1916-07-29
Record high minimum temperature
Record high minimum temperature 19.4 C (66.9 F)
1916-07-30
Record high minimum temperature
Record high minimum temperature 20.6 C (69.1 F)
1917-07-30
Record high minimum temperature
Record high minimum temperature 21.7 C (71.1 F)
1936-07-13
Record high maximum temperature
Record high maximum temperature 40.0 C (104.0 F)
1940-11-11
Record daily snowfall
Record daily snowfall 28.7 cm (11.3 in)
1940-11-26
Record daily snowfall
Record daily snowfall 30.5 cm (12.0 in)
Wettest Day of Each Month
Jul: 110.2 mm (4.3 in)
The wettest day on record for each calendar month at Port Arthur. The most was 110.2 mm (4.3 in) on 5 July 1887.
Record daily precipitation for each month at Port Arthur
Month
Record daily precipitation (mm)
Date
Jan
24.1 mm (0.9 in)
2 January 1941
Feb
26.2 mm (1.0 in)
28 February 1893
Mar
26.7 mm (1.1 in)
23 March 1884
Apr
37.1 mm (1.5 in)
30 April 1936
May
40.4 mm (1.6 in)
17 May 1896
Jun
69.3 mm (2.7 in)
12 June 1920
Jul
110.2 mm (4.3 in)
5 July 1887
Aug
68.1 mm (2.7 in)
3 August 1908
Sep
81.3 mm (3.2 in)
4 September 1916
Oct
83.8 mm (3.3 in)
27 October 1931
Nov
58.9 mm (2.3 in)
17 November 1906
Dec
33.0 mm (1.3 in)
30 December 1936
Period of Record Coverage
1877 to 1941
Complete yearUnder 90 percent of days
65 years of record at Port Arthur, 1877 to 1941. 2 years have data for under 90 percent of days and are left out of rankings: 1877, 1941.
Cooler than the station meanWarmer than the station mean
One stripe for each of 63 complete years at Port Arthur, 1878 to 1940. Blue stripes are years cooler than the station's own mean of 2.3 C (36.1 F); red stripes are warmer. The coolest year was 1883, at -0.4 C (31.3 F), and the warmest was 1931, at 5.7 C (42.3 F). The strongest colour marks a difference of 3.5 C (6.3 F).
Annual mean temperature at Port Arthur as warming stripes, 1878 to 1940
Year
Annual mean temperature
Difference from the station mean
1878
4.7 C
+2.41 C
1879
1.3 C
-1.06 C
1880
0.6 C
-1.73 C
1881
1.9 C
-0.39 C
1882
2.2 C
-0.15 C
1883
-0.4 C
-2.71 C
1884
0.5 C
-1.86 C
1885
0.1 C
-2.25 C
1886
1.1 C
-1.22 C
1887
0.6 C
-1.69 C
1888
0.4 C
-1.88 C
1889
2.7 C
+0.38 C
1890
2.0 C
-0.36 C
1891
2.5 C
+0.22 C
1892
1.8 C
-0.53 C
1893
0.5 C
-1.78 C
1894
3.0 C
+0.67 C
1895
2.0 C
-0.31 C
1896
2.3 C
-0.01 C
1897
2.4 C
+0.07 C
1898
2.7 C
+0.35 C
1899
1.7 C
-0.65 C
1900
3.2 C
+0.91 C
1901
2.3 C
-0.04 C
1902
2.8 C
+0.46 C
1903
1.9 C
-0.45 C
1904
1.2 C
-1.07 C
1905
2.3 C
-0.02 C
1906
3.2 C
+0.85 C
1907
1.3 C
-1.00 C
1908
3.5 C
+1.20 C
1909
2.8 C
+0.45 C
1910
3.5 C
+1.23 C
1911
2.9 C
+0.61 C
1912
1.4 C
-0.89 C
1913
2.4 C
+0.10 C
1914
2.7 C
+0.43 C
1915
3.9 C
+1.63 C
1916
2.2 C
-0.15 C
1917
1.0 C
-1.27 C
1918
2.6 C
+0.29 C
1919
3.3 C
+0.94 C
1920
3.3 C
+1.03 C
1921
4.4 C
+2.08 C
1922
3.4 C
+1.06 C
1923
2.6 C
+0.28 C
1924
1.8 C
-0.48 C
1925
2.6 C
+0.26 C
1926
1.6 C
-0.68 C
1927
2.8 C
+0.44 C
1928
3.4 C
+1.10 C
1929
2.0 C
-0.33 C
1930
3.7 C
+1.37 C
1931
5.7 C
+3.42 C
1932
3.6 C
+1.25 C
1933
2.7 C
+0.36 C
1934
2.8 C
+0.48 C
1935
3.0 C
+0.69 C
1936
0.6 C
-1.71 C
1937
1.6 C
-0.71 C
1938
2.7 C
+0.40 C
1939
2.1 C
-0.19 C
1940
2.2 C
-0.14 C
The annual mean temperature here has risen by 0.2 C (0.1 to 0.4) per decade over 1878 to 1940. In Fahrenheit: 0.4 F (0.2 to 0.7) 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 Port Arthur
Measure
Per decade (C)
Per decade (F)
Period
Complete years
Reading
Annual mean temperature
0.2 C (0.1 to 0.4) per decade
0.4 F (0.2 to 0.7) per decade
1878 to 1940
63
Rise
Mean daily maximum
0.1 C (-0.1 to 0.2) per decade
0.1 F (-0.1 to 0.4) per decade
1878 to 1940
63
Not clearly different from zero
Mean daily minimum
0.4 C (0.3 to 0.6) per decade
0.8 F (0.5 to 1.1) per decade
1878 to 1940
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
1877 to 1941
Yearly extremes at Port Arthur: 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)
1936
31.7 C (89.1 F)
65
Coldest night (TNn)
-40.0 C (-40.0 F)
1885
-34.4 C (-29.9 F)
65
Wettest day (Rx1day)
110.2 mm (4.3 in)
1887
39.6 mm (1.6 in)
65
Wettest five days (Rx5day)
133.1 mm (5.2 in)
1887
66.6 mm (2.6 in)
65
Longest dry spell (CDD)
54 days
1888
24 days
65
Hottest day (TXx)
The hottest day of the year at Port Arthur, 1877 to 1941. The record is 40.0 C (104.0 F) in 1936, marked on the chart; the median year is 31.7 C (89.1 F).
Hottest day (TXx) at Port Arthur by year
Year
Hottest day (TXx)
1877
31.1 C (88.0 F)
1878
35.0 C (95.0 F)
1879
30.6 C (87.1 F)
1880
31.1 C (88.0 F)
1881
31.7 C (89.1 F)
1882
30.0 C (86.0 F)
1883
35.6 C (96.1 F)
1884
30.0 C (86.0 F)
1885
31.7 C (89.1 F)
1886
32.2 C (90.0 F)
1887
31.7 C (89.1 F)
1888
32.8 C (91.0 F)
1889
29.4 C (84.9 F)
1890
31.1 C (88.0 F)
1891
32.8 C (91.0 F)
1892
32.2 C (90.0 F)
1893
35.0 C (95.0 F)
1894
31.7 C (89.1 F)
1895
29.4 C (84.9 F)
1896
32.8 C (91.0 F)
1897
31.7 C (89.1 F)
1898
29.4 C (84.9 F)
1899
30.0 C (86.0 F)
1900
30.0 C (86.0 F)
1901
32.2 C (90.0 F)
1902
28.3 C (82.9 F)
1903
30.6 C (87.1 F)
1904
28.9 C (84.0 F)
1905
27.8 C (82.0 F)
1906
28.9 C (84.0 F)
1907
30.0 C (86.0 F)
1908
32.2 C (90.0 F)
1909
29.4 C (84.9 F)
1910
36.1 C (97.0 F)
1911
34.4 C (93.9 F)
1912
30.0 C (86.0 F)
1913
32.2 C (90.0 F)
1914
31.1 C (88.0 F)
1915
31.7 C (89.1 F)
1916
37.2 C (99.0 F)
1917
31.7 C (89.1 F)
1918
30.6 C (87.1 F)
1919
33.3 C (91.9 F)
1920
30.0 C (86.0 F)
1921
33.3 C (91.9 F)
1922
33.3 C (91.9 F)
1923
35.0 C (95.0 F)
1924
31.7 C (89.1 F)
1925
33.3 C (91.9 F)
1926
32.2 C (90.0 F)
1927
31.1 C (88.0 F)
1928
32.2 C (90.0 F)
1929
32.8 C (91.0 F)
1930
31.7 C (89.1 F)
1931
34.4 C (93.9 F)
1932
31.1 C (88.0 F)
1933
32.8 C (91.0 F)
1934
35.0 C (95.0 F)
1935
32.2 C (90.0 F)
1936
40.0 C (104.0 F)
1937
31.1 C (88.0 F)
1938
31.7 C (89.1 F)
1939
29.4 C (84.9 F)
1940
30.6 C (87.1 F)
1941
34.4 C (93.9 F)
Coldest night (TNn)
The coldest night of the year at Port Arthur, 1877 to 1941. The record is -40.0 C (-40.0 F) in 1885, marked on the chart; the median year is -34.4 C (-29.9 F).
Coldest night (TNn) at Port Arthur by year
Year
Coldest night (TNn)
1877
-21.1 C (-6.0 F)
1878
-28.3 C (-18.9 F)
1879
-38.9 C (-38.0 F)
1880
-37.8 C (-36.0 F)
1881
-38.3 C (-36.9 F)
1882
-36.7 C (-34.1 F)
1883
-36.1 C (-33.0 F)
1884
-37.2 C (-35.0 F)
1885
-40.0 C (-40.0 F)
1886
-37.2 C (-35.0 F)
1887
-37.2 C (-35.0 F)
1888
-39.4 C (-38.9 F)
1889
-35.6 C (-32.1 F)
1890
-34.4 C (-29.9 F)
1891
-33.3 C (-27.9 F)
1892
-37.2 C (-35.0 F)
1893
-37.2 C (-35.0 F)
1894
-32.8 C (-27.0 F)
1895
-37.2 C (-35.0 F)
1896
-36.1 C (-33.0 F)
1897
-34.4 C (-29.9 F)
1898
-34.4 C (-29.9 F)
1899
-38.3 C (-36.9 F)
1900
-34.4 C (-29.9 F)
1901
-33.9 C (-29.0 F)
1902
-34.4 C (-29.9 F)
1903
-35.0 C (-31.0 F)
1904
-36.7 C (-34.1 F)
1905
-31.1 C (-24.0 F)
1906
-32.8 C (-27.0 F)
1907
-32.8 C (-27.0 F)
1908
-35.0 C (-31.0 F)
1909
-38.3 C (-36.9 F)
1910
-34.4 C (-29.9 F)
1911
-34.4 C (-29.9 F)
1912
-37.8 C (-36.0 F)
1913
-32.2 C (-26.0 F)
1914
-38.3 C (-36.9 F)
1915
-36.7 C (-34.1 F)
1916
-32.8 C (-27.0 F)
1917
-36.7 C (-34.1 F)
1918
-34.4 C (-29.9 F)
1919
-33.3 C (-27.9 F)
1920
-32.8 C (-27.0 F)
1921
-30.0 C (-22.0 F)
1922
-32.8 C (-27.0 F)
1923
-34.4 C (-29.9 F)
1924
-34.4 C (-29.9 F)
1925
-30.6 C (-23.1 F)
1926
-33.3 C (-27.9 F)
1927
-35.6 C (-32.1 F)
1928
-29.4 C (-20.9 F)
1929
-34.4 C (-29.9 F)
1930
-33.3 C (-27.9 F)
1931
-28.9 C (-20.0 F)
1932
-31.1 C (-24.0 F)
1933
-34.4 C (-29.9 F)
1934
-33.9 C (-29.0 F)
1935
-37.2 C (-35.0 F)
1936
-33.9 C (-29.0 F)
1937
-33.3 C (-27.9 F)
1938
-34.4 C (-29.9 F)
1939
-36.1 C (-33.0 F)
1940
-37.2 C (-35.0 F)
1941
-32.8 C (-27.0 F)
Wettest day (Rx1day)
The wettest day of the year at Port Arthur, 1877 to 1941. The record is 110.2 mm (4.3 in) in 1887, marked on the chart; the median year is 39.6 mm (1.6 in).
Wettest day (Rx1day) at Port Arthur by year
Year
Wettest day (Rx1day)
1877
33.3 mm (1.3 in)
1878
35.6 mm (1.4 in)
1879
35.3 mm (1.4 in)
1880
37.1 mm (1.5 in)
1881
39.6 mm (1.6 in)
1882
27.2 mm (1.1 in)
1883
38.6 mm (1.5 in)
1884
38.6 mm (1.5 in)
1885
38.1 mm (1.5 in)
1886
74.9 mm (2.9 in)
1887
110.2 mm (4.3 in)
1888
44.7 mm (1.8 in)
1889
35.1 mm (1.4 in)
1890
33.3 mm (1.3 in)
1891
41.1 mm (1.6 in)
1892
43.7 mm (1.7 in)
1893
34.3 mm (1.4 in)
1894
39.4 mm (1.6 in)
1895
36.8 mm (1.4 in)
1896
41.1 mm (1.6 in)
1897
36.3 mm (1.4 in)
1898
68.3 mm (2.7 in)
1899
37.1 mm (1.5 in)
1900
48.8 mm (1.9 in)
1901
45.5 mm (1.8 in)
1902
61.5 mm (2.4 in)
1903
63.8 mm (2.5 in)
1904
34.8 mm (1.4 in)
1905
66.5 mm (2.6 in)
1906
58.9 mm (2.3 in)
1907
62.7 mm (2.5 in)
1908
68.1 mm (2.7 in)
1909
37.1 mm (1.5 in)
1910
39.4 mm (1.6 in)
1911
39.4 mm (1.6 in)
1912
28.2 mm (1.1 in)
1913
86.4 mm (3.4 in)
1914
43.2 mm (1.7 in)
1915
56.4 mm (2.2 in)
1916
81.3 mm (3.2 in)
1917
32.3 mm (1.3 in)
1918
31.0 mm (1.2 in)
1919
42.7 mm (1.7 in)
1920
69.3 mm (2.7 in)
1921
30.0 mm (1.2 in)
1922
32.0 mm (1.3 in)
1923
26.4 mm (1.0 in)
1924
55.4 mm (2.2 in)
1925
39.6 mm (1.6 in)
1926
61.0 mm (2.4 in)
1927
43.2 mm (1.7 in)
1928
32.3 mm (1.3 in)
1929
37.3 mm (1.5 in)
1930
49.8 mm (2.0 in)
1931
83.8 mm (3.3 in)
1932
34.3 mm (1.4 in)
1933
65.0 mm (2.6 in)
1934
39.9 mm (1.6 in)
1935
34.8 mm (1.4 in)
1936
56.4 mm (2.2 in)
1937
53.3 mm (2.1 in)
1938
34.3 mm (1.4 in)
1939
34.0 mm (1.3 in)
1940
30.5 mm (1.2 in)
1941
46.7 mm (1.8 in)
Wettest five days (Rx5day)
The wettest five days of the year at Port Arthur, 1877 to 1941. The record is 133.1 mm (5.2 in) in 1887, marked on the chart; the median year is 66.6 mm (2.6 in).
Wettest five days (Rx5day) at Port Arthur by year
Year
Wettest five days (Rx5day)
1877
46.0 mm (1.8 in)
1878
66.6 mm (2.6 in)
1879
52.3 mm (2.1 in)
1880
55.9 mm (2.2 in)
1881
73.7 mm (2.9 in)
1882
43.2 mm (1.7 in)
1883
51.3 mm (2.0 in)
1884
95.5 mm (3.8 in)
1885
39.6 mm (1.6 in)
1886
99.8 mm (3.9 in)
1887
133.1 mm (5.2 in)
1888
92.2 mm (3.6 in)
1889
48.8 mm (1.9 in)
1890
49.3 mm (1.9 in)
1891
77.2 mm (3.0 in)
1892
76.9 mm (3.0 in)
1893
69.6 mm (2.7 in)
1894
52.6 mm (2.1 in)
1895
53.6 mm (2.1 in)
1896
78.1 mm (3.1 in)
1897
58.2 mm (2.3 in)
1898
128.0 mm (5.0 in)
1899
56.1 mm (2.2 in)
1900
69.8 mm (2.7 in)
1901
78.8 mm (3.1 in)
1902
78.5 mm (3.1 in)
1903
109.0 mm (4.3 in)
1904
62.8 mm (2.5 in)
1905
102.3 mm (4.0 in)
1906
59.9 mm (2.4 in)
1907
101.0 mm (4.0 in)
1908
76.5 mm (3.0 in)
1909
51.1 mm (2.0 in)
1910
51.1 mm (2.0 in)
1911
64.0 mm (2.5 in)
1912
51.3 mm (2.0 in)
1913
92.5 mm (3.6 in)
1914
78.5 mm (3.1 in)
1915
64.1 mm (2.5 in)
1916
116.1 mm (4.6 in)
1917
35.6 mm (1.4 in)
1918
42.4 mm (1.7 in)
1919
52.9 mm (2.1 in)
1920
88.6 mm (3.5 in)
1921
43.5 mm (1.7 in)
1922
43.4 mm (1.7 in)
1923
40.6 mm (1.6 in)
1924
94.0 mm (3.7 in)
1925
74.2 mm (2.9 in)
1926
90.7 mm (3.6 in)
1927
86.4 mm (3.4 in)
1928
61.5 mm (2.4 in)
1929
76.1 mm (3.0 in)
1930
73.9 mm (2.9 in)
1931
117.3 mm (4.6 in)
1932
53.6 mm (2.1 in)
1933
88.9 mm (3.5 in)
1934
64.3 mm (2.5 in)
1935
55.1 mm (2.2 in)
1936
56.4 mm (2.2 in)
1937
112.2 mm (4.4 in)
1938
77.0 mm (3.0 in)
1939
53.3 mm (2.1 in)
1940
50.1 mm (2.0 in)
1941
73.1 mm (2.9 in)
Longest dry spell (CDD)
The longest dry spell of the year at Port Arthur, 1877 to 1941. The record is 54 days in 1888, marked on the chart; the median year is 24 days.
Longest dry spell (CDD) at Port Arthur by year
Year
Longest dry spell (CDD)
1877
12 days
1878
29 days
1879
25 days
1880
17 days
1881
32 days
1882
19 days
1883
23 days
1884
18 days
1885
23 days
1886
20 days
1887
23 days
1888
54 days
1889
20 days
1890
32 days
1891
30 days
1892
27 days
1893
17 days
1894
24 days
1895
13 days
1896
17 days
1897
18 days
1898
30 days
1899
24 days
1900
27 days
1901
32 days
1902
27 days
1903
27 days
1904
26 days
1905
27 days
1906
17 days
1907
33 days
1908
29 days
1909
25 days
1910
22 days
1911
24 days
1912
30 days
1913
26 days
1914
26 days
1915
40 days
1916
28 days
1917
39 days
1918
35 days
1919
23 days
1920
31 days
1921
18 days
1922
19 days
1923
27 days
1924
36 days
1925
31 days
1926
13 days
1927
17 days
1928
16 days
1929
20 days
1930
17 days
1931
13 days
1932
29 days
1933
14 days
1934
18 days
1935
13 days
1936
21 days
1937
13 days
1938
18 days
1939
18 days
1940
31 days
1941
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
63 years with a frost
Across 63 years with a frost, the median last spring frost at Port Arthur falls on 26 May and the median first autumn frost on 19 September, which leaves a median of 118 days between them.
In 1911 to 1940 the median growing season was 127 days. That is 13 days more than in 1878 to 1907.
Fitted over all years, the growing season changes by +2.8 days per decade at this station.
Frost dates and growing season at Port Arthur
Measure
Median, all years
Earliest period (1878 to 1907)
Recent period (1911 to 1940)
Recent against earliest
Fitted trend
Last spring frost
26 May
28 May
23 May
5 days earlier
-1.0 days per decade
First autumn frost
19 September
15 September
26 September
11 days later
+1.8 days per decade
Growing days
118 days
114 days
127 days
13 days more
+2.8 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
63 years, 1878 to 1940
A day with at least 41.9 mm (1.6 in) of rain is expected about once in 2 years. A day with at least 118.1 mm (4.6 in) of rain is expected about once in 100 years.
Rainfall return levels at Port Arthur: the daily rain expected about once in a given number of years
Expected about once in
A day with at least
Note
2 years
41.9 mm (1.6 in)
5 years
55.7 mm (2.2 in)
10 years
67.0 mm (2.6 in)
25 years
84.4 mm (3.3 in)
50 years
100.0 mm (3.9 in)
100 years
118.1 mm (4.6 in)
Longer than the 63 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, 63 years of values from 1878 to 1940.
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: 110.2 mm (4.3 in) in 1887; 86.4 mm (3.4 in) in 1913; 83.8 mm (3.3 in) in 1931.
Station Changes
1 suspected
One change was suspected in the annual mean temperature of Port Arthur, at 1936. Each is measured against neighbouring stations.
Relative to 5 neighbouring stations, the station's annual mean temperature from 1936 ran 1.3 C (2.3 F) lower than in the years before (likely change).
Suspected changes in the annual mean temperature at Port Arthur, against neighbouring stations
Year
Shift (C)
Shift (F)
Strength
Neighbours
1936
-1.3
-2.3
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 Port Arthur standing records by year: CSV or JSON. Field meanings are on the data page.
Data for Port Arthur 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.