Record highRecord low2026 daily maximum2026 daily minimum
The band shows the record high and record low for each calendar day at Portage Southport A. 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 Portage Southport A, with 2026 drawn through them
Month
Highest record high
Lowest record low
2026 highest maximum
2026 lowest minimum
Jan
11.1 C (52.0 F)
-41.1 C (-42.0 F)
n/a
n/a
Feb
12.2 C (54.0 F)
-42.2 C (-44.0 F)
n/a
n/a
Mar
19.4 C (66.9 F)
-34.4 C (-29.9 F)
n/a
n/a
Apr
34.8 C (94.6 F)
-23.3 C (-9.9 F)
n/a
n/a
May
37.8 C (100.0 F)
-12.8 C (9.0 F)
n/a
n/a
Jun
36.1 C (97.0 F)
-1.7 C (28.9 F)
n/a
n/a
Jul
37.2 C (99.0 F)
2.2 C (36.0 F)
n/a
n/a
Aug
40.2 C (104.4 F)
0.6 C (33.1 F)
n/a
n/a
Sep
37.8 C (100.0 F)
-6.7 C (19.9 F)
n/a
n/a
Oct
30.0 C (86.0 F)
-15.6 C (3.9 F)
n/a
n/a
Nov
22.8 C (73.0 F)
-30.6 C (-23.1 F)
n/a
n/a
Dec
13.9 C (57.0 F)
-37.2 C (-35.0 F)
n/a
n/a
Which Years Hold Standing Records
1,464 standing records
Year with most
1,464 records at Portage Southport A still stand. 1958 holds the most, with 61.
Standing records at Portage Southport A by the year they were set
Year set
Standing records
1941
25
1942
59
1943
49
1944
41
1945
34
1952
2
1953
49
1954
48
1955
53
1956
43
1957
28
1958
61
1959
45
1960
21
1961
38
1962
42
1963
44
1964
53
1965
31
1966
54
1967
49
1968
38
1969
31
1970
32
1971
13
1972
48
1973
39
1974
35
1975
35
1976
32
1977
55
1978
35
1979
34
1980
48
1981
44
1982
27
1983
49
All-Time Record Progression
2 new records
2 all-time records were set at Portage Southport A between 22 May 1980 and 4 August 1983. Each dot is a new record.
When Portage Southport A set new all-time records
Date
Kind
Detail
1980-05-22
Record high maximum temperature
Record high maximum temperature 37.8 C (100.0 F)
1983-08-04
Record high maximum temperature
Record high maximum temperature 40.2 C (104.4 F)
Wettest Day of Each Month
Jun: 87.6 mm (3.4 in)
The wettest day on record for each calendar month at Portage Southport A. The most was 87.6 mm (3.4 in) on 27 June 1944.
Record daily precipitation for each month at Portage Southport A
Month
Record daily precipitation (mm)
Date
Jan
22.1 mm (0.9 in)
24 January 1975
Feb
18.8 mm (0.7 in)
22 February 1961
Mar
26.7 mm (1.1 in)
25 March 1945
Apr
54.4 mm (2.1 in)
27 April 1966
May
43.4 mm (1.7 in)
27 May 1942
Jun
87.6 mm (3.4 in)
27 June 1944
Jul
72.6 mm (2.9 in)
15 July 1945
Aug
86.9 mm (3.4 in)
20 August 1972
Sep
56.4 mm (2.2 in)
12 September 1978
Oct
39.1 mm (1.5 in)
2 October 1971
Nov
20.8 mm (0.8 in)
5 November 1956
Dec
23.8 mm (0.9 in)
2 December 1982
Period of Record Coverage
1941 to 1983
Complete yearUnder 90 percent of days
37 years of record at Portage Southport A, 1941 to 1983. 3 years have data for under 90 percent of days and are left out of rankings: 1941, 1945, 1952.
Cooler than the station meanWarmer than the station mean
One stripe for each of 34 complete years at Portage Southport A, 1942 to 1983. Blue stripes are years cooler than the station's own mean of 2.7 C (36.9 F); red stripes are warmer. The coolest year was 1979, at 0.9 C (33.5 F), and the warmest was 1981, at 5.0 C (41.0 F). The strongest colour marks a difference of 2.4 C (4.3 F).
Annual mean temperature at Portage Southport A as warming stripes, 1942 to 1983
Year
Annual mean temperature
Difference from the station mean
1942
3.1 C
+0.38 C
1943
2.5 C
-0.18 C
1944
3.8 C
+1.14 C
1953
4.0 C
+1.32 C
1954
3.4 C
+0.71 C
1955
2.2 C
-0.52 C
1956
2.2 C
-0.54 C
1957
3.2 C
+0.50 C
1958
3.4 C
+0.73 C
1959
2.7 C
-0.04 C
1960
2.9 C
+0.16 C
1961
3.3 C
+0.64 C
1962
2.5 C
-0.21 C
1963
3.7 C
+1.01 C
1964
2.5 C
-0.16 C
1965
1.3 C
-1.37 C
1966
1.2 C
-1.49 C
1967
1.9 C
-0.84 C
1968
2.6 C
-0.15 C
1969
2.2 C
-0.53 C
1970
1.8 C
-0.91 C
1971
2.3 C
-0.41 C
1972
1.3 C
-1.42 C
1973
3.6 C
+0.87 C
1974
2.1 C
-0.61 C
1975
2.8 C
+0.14 C
1976
3.0 C
+0.32 C
1977
3.7 C
+0.98 C
1978
1.9 C
-0.76 C
1979
0.9 C
-1.84 C
1980
3.0 C
+0.31 C
1981
5.0 C
+2.30 C
1982
2.1 C
-0.61 C
1983
3.7 C
+0.97 C
The fitted trend in annual mean temperature here over 1942 to 1983 is -0.1 C (-0.4 to 0.2) per decade. The interval includes zero, so the trend is not clearly different from zero. In Fahrenheit: -0.2 F (-0.7 to 0.3) per decade. The slope is a straight line fitted to 34 complete years; the brackets give its 95 percent interval.
Fitted temperature trends per decade at Portage Southport A
Measure
Per decade (C)
Per decade (F)
Period
Complete years
Reading
Annual mean temperature
-0.1 C (-0.4 to 0.2) per decade
-0.2 F (-0.7 to 0.3) per decade
1942 to 1983
34
Not clearly different from zero
Mean daily maximum
0.01 C (-0.29 to 0.32) per decade
0.02 F (-0.53 to 0.57) per decade
1942 to 1983
34
Not clearly different from zero
Mean daily minimum
-0.2 C (-0.5 to 0.1) per decade
-0.4 F (-1.0 to 0.1) per decade
1942 to 1983
34
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
1941 to 1983
Yearly extremes at Portage Southport A: the record and the median year
Measure
Record
Year of the record
Median year
Years with a value
Hottest day (TXx)
40.2 C (104.4 F)
1983
35.0 C (95.0 F)
37
Coldest night (TNn)
-42.2 C (-44.0 F)
1966
-34.4 C (-29.9 F)
37
Wettest day (Rx1day)
87.6 mm (3.4 in)
1944
39.4 mm (1.6 in)
37
Wettest five days (Rx5day)
124.7 mm (4.9 in)
1944
63.7 mm (2.5 in)
37
Longest dry spell (CDD)
58 days
1980
27 days
37
Hottest day (TXx)
The hottest day of the year at Portage Southport A, 1941 to 1983. The record is 40.2 C (104.4 F) in 1983, marked on the chart; the median year is 35.0 C (95.0 F).
Hottest day (TXx) at Portage Southport A by year
Year
Hottest day (TXx)
1941
36.1 C (97.0 F)
1942
36.7 C (98.1 F)
1943
33.3 C (91.9 F)
1944
37.2 C (99.0 F)
1945
35.6 C (96.1 F)
1952
5.6 C (42.1 F)
1953
33.3 C (91.9 F)
1954
32.8 C (91.0 F)
1955
35.0 C (95.0 F)
1956
35.0 C (95.0 F)
1957
33.9 C (93.0 F)
1958
36.7 C (98.1 F)
1959
32.8 C (91.0 F)
1960
34.4 C (93.9 F)
1961
37.2 C (99.0 F)
1962
33.9 C (93.0 F)
1963
32.8 C (91.0 F)
1964
35.0 C (95.0 F)
1965
35.6 C (96.1 F)
1966
34.4 C (93.9 F)
1967
36.1 C (97.0 F)
1968
34.4 C (93.9 F)
1969
35.6 C (96.1 F)
1970
36.1 C (97.0 F)
1971
35.0 C (95.0 F)
1972
35.6 C (96.1 F)
1973
33.9 C (93.0 F)
1974
32.8 C (91.0 F)
1975
37.2 C (99.0 F)
1976
35.6 C (96.1 F)
1977
33.4 C (92.1 F)
1978
35.8 C (96.4 F)
1979
35.6 C (96.1 F)
1980
37.8 C (100.0 F)
1981
37.2 C (99.0 F)
1982
34.3 C (93.7 F)
1983
40.2 C (104.4 F)
Coldest night (TNn)
The coldest night of the year at Portage Southport A, 1941 to 1983. The record is -42.2 C (-44.0 F) in 1966, marked on the chart; the median year is -34.4 C (-29.9 F).
Coldest night (TNn) at Portage Southport A by year
Year
Coldest night (TNn)
1941
-24.4 C (-11.9 F)
1942
-34.4 C (-29.9 F)
1943
-41.1 C (-42.0 F)
1944
-30.6 C (-23.1 F)
1945
-34.4 C (-29.9 F)
1952
-22.8 C (-9.0 F)
1953
-32.2 C (-26.0 F)
1954
-35.6 C (-32.1 F)
1955
-33.3 C (-27.9 F)
1956
-32.8 C (-27.0 F)
1957
-33.9 C (-29.0 F)
1958
-33.3 C (-27.9 F)
1959
-33.3 C (-27.9 F)
1960
-29.4 C (-20.9 F)
1961
-34.4 C (-29.9 F)
1962
-37.2 C (-35.0 F)
1963
-34.4 C (-29.9 F)
1964
-34.4 C (-29.9 F)
1965
-34.4 C (-29.9 F)
1966
-42.2 C (-44.0 F)
1967
-38.3 C (-36.9 F)
1968
-38.9 C (-38.0 F)
1969
-34.4 C (-29.9 F)
1970
-37.2 C (-35.0 F)
1971
-34.4 C (-29.9 F)
1972
-37.2 C (-35.0 F)
1973
-34.4 C (-29.9 F)
1974
-37.8 C (-36.0 F)
1975
-32.2 C (-26.0 F)
1976
-33.9 C (-29.0 F)
1977
-34.4 C (-29.9 F)
1978
-38.4 C (-37.1 F)
1979
-36.3 C (-33.3 F)
1980
-34.5 C (-30.1 F)
1981
-33.2 C (-27.8 F)
1982
-36.6 C (-33.9 F)
1983
-35.1 C (-31.2 F)
Wettest day (Rx1day)
The wettest day of the year at Portage Southport A, 1941 to 1983. The record is 87.6 mm (3.4 in) in 1944, marked on the chart; the median year is 39.4 mm (1.6 in).
Wettest day (Rx1day) at Portage Southport A by year
Year
Wettest day (Rx1day)
1941
38.1 mm (1.5 in)
1942
43.4 mm (1.7 in)
1943
33.3 mm (1.3 in)
1944
87.6 mm (3.4 in)
1945
72.6 mm (2.9 in)
1952
2.3 mm (0.09 in)
1953
46.2 mm (1.8 in)
1954
47.2 mm (1.9 in)
1955
39.4 mm (1.6 in)
1956
33.3 mm (1.3 in)
1957
42.4 mm (1.7 in)
1958
24.9 mm (1.0 in)
1959
66.3 mm (2.6 in)
1960
22.9 mm (0.9 in)
1961
27.9 mm (1.1 in)
1962
61.7 mm (2.4 in)
1963
47.8 mm (1.9 in)
1964
37.6 mm (1.5 in)
1965
29.0 mm (1.1 in)
1966
54.4 mm (2.1 in)
1967
33.8 mm (1.3 in)
1968
44.5 mm (1.8 in)
1969
81.8 mm (3.2 in)
1970
36.1 mm (1.4 in)
1971
42.9 mm (1.7 in)
1972
86.9 mm (3.4 in)
1973
30.5 mm (1.2 in)
1974
30.2 mm (1.2 in)
1975
37.3 mm (1.5 in)
1976
33.3 mm (1.3 in)
1977
34.2 mm (1.3 in)
1978
56.4 mm (2.2 in)
1979
55.1 mm (2.2 in)
1980
71.8 mm (2.8 in)
1981
38.4 mm (1.5 in)
1982
54.8 mm (2.2 in)
1983
20.8 mm (0.8 in)
Wettest five days (Rx5day)
The wettest five days of the year at Portage Southport A, 1941 to 1983. The record is 124.7 mm (4.9 in) in 1944, marked on the chart; the median year is 63.7 mm (2.5 in).
Wettest five days (Rx5day) at Portage Southport A by year
Year
Wettest five days (Rx5day)
1941
88.2 mm (3.5 in)
1942
59.9 mm (2.4 in)
1943
50.1 mm (2.0 in)
1944
124.7 mm (4.9 in)
1945
83.8 mm (3.3 in)
1952
2.3 mm (0.09 in)
1953
70.1 mm (2.8 in)
1954
63.7 mm (2.5 in)
1955
63.5 mm (2.5 in)
1956
69.4 mm (2.7 in)
1957
45.2 mm (1.8 in)
1958
42.0 mm (1.7 in)
1959
85.0 mm (3.3 in)
1960
35.8 mm (1.4 in)
1961
64.0 mm (2.5 in)
1962
81.7 mm (3.2 in)
1963
60.5 mm (2.4 in)
1964
70.6 mm (2.8 in)
1965
48.2 mm (1.9 in)
1966
60.5 mm (2.4 in)
1967
57.4 mm (2.3 in)
1968
71.7 mm (2.8 in)
1969
89.7 mm (3.5 in)
1970
43.7 mm (1.7 in)
1971
69.0 mm (2.7 in)
1972
86.9 mm (3.4 in)
1973
59.0 mm (2.3 in)
1974
63.9 mm (2.5 in)
1975
54.0 mm (2.1 in)
1976
54.4 mm (2.1 in)
1977
64.0 mm (2.5 in)
1978
71.0 mm (2.8 in)
1979
55.7 mm (2.2 in)
1980
117.4 mm (4.6 in)
1981
63.3 mm (2.5 in)
1982
85.2 mm (3.4 in)
1983
40.4 mm (1.6 in)
Longest dry spell (CDD)
The longest dry spell of the year at Portage Southport A, 1941 to 1983. The record is 58 days in 1980, marked on the chart; the median year is 27 days.
Longest dry spell (CDD) at Portage Southport A by year
Year
Longest dry spell (CDD)
1941
19 days
1942
25 days
1943
42 days
1944
27 days
1945
23 days
1952
20 days
1953
25 days
1954
25 days
1955
24 days
1956
22 days
1957
23 days
1958
16 days
1959
28 days
1960
22 days
1961
29 days
1962
25 days
1963
31 days
1964
38 days
1965
28 days
1966
29 days
1967
32 days
1968
34 days
1969
28 days
1970
28 days
1971
28 days
1972
22 days
1973
29 days
1974
20 days
1975
33 days
1976
47 days
1977
33 days
1978
25 days
1979
25 days
1980
58 days
1981
36 days
1982
18 days
1983
20 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
34 years with a frost
Across 34 years with a frost, the median last spring frost at Portage Southport A falls on 18 May and the median first autumn frost on 22 September, which leaves a median of 128 days between them.
Fitted over all years, the growing season changes by +1.4 days per decade at this station.
Frost dates and growing season at Portage Southport A
Measure
Median, all years
Earliest period
Recent period (1954 to 1983)
Recent against earliest
Fitted trend
Last spring frost
18 May
n/a
20 May
n/a
-0.2 days per decade
First autumn frost
22 September
n/a
22 September
n/a
+1.2 days per decade
Growing days
128 days
n/a
128 days
n/a
+1.4 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
34 years, 1942 to 1983
A day with at least 41.1 mm (1.6 in) of rain is expected about once in 2 years. A day with at least 111.0 mm (4.4 in) of rain is expected about once in 100 years.
Rainfall return levels at Portage Southport A: the daily rain expected about once in a given number of years
Expected about once in
A day with at least
Note
2 years
41.1 mm (1.6 in)
5 years
56.7 mm (2.2 in)
10 years
68.2 mm (2.7 in)
25 years
84.2 mm (3.3 in)
50 years
97.1 mm (3.8 in)
Longer than the 34 years of record
100 years
111.0 mm (4.4 in)
Longer than the 34 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, 34 years of values from 1942 to 1983.
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: 87.6 mm (3.4 in) in 1944; 86.9 mm (3.4 in) in 1972; 81.8 mm (3.2 in) in 1969.
Download the Data
Data for Portage Southport A standing records by year: CSV or JSON. Field meanings are on the data page.
Data for Portage Southport A 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.