Record envelope, standing records and threshold days for Summerside A (CA008300700), Prince Edward Island, Canada, with 61 years of record.
Key Facts for Summerside A
Summerside A (CA008300700) is a weather station in Prince Edward Island, Canada at 46.43 latitude and -63.83 longitude, 20 m (66 ft) above sea level.
The station reports from 1942 to 2002, 61 years of record.
1,464 records set at Summerside A still stand.
Records are tracked for tmax, tmin, prcp, snow: an element needs 30 years of data to be eligible.
Summerside A set a daily record precipitation of 28.0 mm (1.1 in) on 14 December 1983.
About the Station
Location: Prince Edward Island, Canada, 46.43 latitude, -63.83 longitude.
Elevation: 20 m (66 ft).
Period of record: 1942 to 2002, 61 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 Summerside 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 Summerside A, with 2026 drawn through them
Month
Highest record high
Lowest record low
2026 highest maximum
2026 lowest minimum
Jan
12.1 C (53.8 F)
-29.9 C (-21.8 F)
n/a
n/a
Feb
12.8 C (55.0 F)
-26.1 C (-15.0 F)
n/a
n/a
Mar
15.6 C (60.1 F)
-23.9 C (-11.0 F)
n/a
n/a
Apr
23.3 C (73.9 F)
-12.2 C (10.0 F)
n/a
n/a
May
32.0 C (89.6 F)
-5.0 C (23.0 F)
n/a
n/a
Jun
32.2 C (90.0 F)
0.0 C (32.0 F)
n/a
n/a
Jul
33.3 C (91.9 F)
6.7 C (44.1 F)
n/a
n/a
Aug
33.3 C (91.9 F)
4.4 C (39.9 F)
n/a
n/a
Sep
31.7 C (89.1 F)
-0.1 C (31.8 F)
n/a
n/a
Oct
24.4 C (75.9 F)
-5.6 C (21.9 F)
n/a
n/a
Nov
21.2 C (70.2 F)
-13.3 C (8.1 F)
n/a
n/a
Dec
15.6 C (60.1 F)
-25.6 C (-14.1 F)
n/a
n/a
Which Years Hold Standing Records
1,464 standing records
Year with most
1,464 records at Summerside A still stand. 1972 holds the most, with 63.
Standing records at Summerside A by the year they were set
Year set
Standing records
1942
43
1943
56
1944
50
1945
43
1946
41
1947
57
1948
13
1949
30
1950
56
1951
35
1952
23
1953
38
1954
42
1955
20
1956
35
1957
35
1958
29
1959
24
1960
20
1961
36
1962
35
1963
32
1964
36
1965
32
1966
24
1967
39
1968
34
1969
23
1970
20
1971
32
1972
63
1973
35
1974
24
1975
25
1976
46
1977
25
1978
31
1979
46
1980
28
1981
38
1982
43
1983
27
All-Time Record Progression
2 new records
2 all-time records were set at Summerside A between 5 January 1981 and 18 January 1982. Each dot is a new record.
When Summerside A set new all-time records
Date
Kind
Detail
1981-01-05
Record low minimum temperature
Record low minimum temperature -27.5 C (-17.5 F)
1982-01-18
Record low minimum temperature
Record low minimum temperature -29.9 C (-21.8 F)
Wettest Day of Each Month
Aug: 111.8 mm (4.4 in)
The wettest day on record for each calendar month at Summerside A. The most was 111.8 mm (4.4 in) on 13 August 1948.
Record daily precipitation for each month at Summerside A
Month
Record daily precipitation (mm)
Date
Jan
71.1 mm (2.8 in)
14 January 1978
Feb
74.7 mm (2.9 in)
8 February 1953
Mar
41.9 mm (1.6 in)
18 March 1963
Apr
87.6 mm (3.4 in)
1 April 1962
May
58.7 mm (2.3 in)
29 May 1951
Jun
57.9 mm (2.3 in)
13 June 1968
Jul
71.4 mm (2.8 in)
28 July 1979
Aug
111.8 mm (4.4 in)
13 August 1948
Sep
109.2 mm (4.3 in)
22 September 1942
Oct
69.3 mm (2.7 in)
21 October 1968
Nov
91.2 mm (3.6 in)
5 November 1944
Dec
46.0 mm (1.8 in)
12 December 1944
Period of Record Coverage
1942 to 1983
Complete yearUnder 90 percent of days
42 years of record at Summerside A, 1942 to 1983. 2 years have data for under 90 percent of days and are left out of rankings: 1942, 1948.
Cooler than the station meanWarmer than the station mean
One stripe for each of 38 complete years at Summerside A, 1943 to 1983. Blue stripes are years cooler than the station's own mean of 5.7 C (42.3 F); red stripes are warmer. The coolest year was 1972, at 4.2 C (39.5 F), and the warmest was 1953, at 7.0 C (44.7 F). The strongest colour marks a difference of 1.6 C (2.9 F).
Annual mean temperature at Summerside A as warming stripes, 1943 to 1983
Year
Annual mean temperature
Difference from the station mean
1943
4.8 C
-0.89 C
1944
6.2 C
+0.44 C
1945
5.8 C
+0.07 C
1949
6.2 C
+0.48 C
1950
5.5 C
-0.25 C
1951
6.3 C
+0.56 C
1952
6.4 C
+0.71 C
1953
7.0 C
+1.32 C
1954
6.4 C
+0.63 C
1955
5.8 C
+0.03 C
1956
5.6 C
-0.10 C
1957
5.9 C
+0.14 C
1958
5.9 C
+0.20 C
1959
6.1 C
+0.36 C
1960
6.8 C
+1.12 C
1961
5.8 C
+0.09 C
1962
5.1 C
-0.61 C
1963
5.3 C
-0.44 C
1964
5.2 C
-0.55 C
1965
4.9 C
-0.87 C
1966
6.5 C
+0.75 C
1967
5.1 C
-0.61 C
1968
5.3 C
-0.39 C
1969
6.4 C
+0.66 C
1970
5.3 C
-0.45 C
1971
5.5 C
-0.19 C
1972
4.2 C
-1.56 C
1973
6.0 C
+0.31 C
1974
5.0 C
-0.73 C
1975
5.5 C
-0.24 C
1976
5.5 C
-0.20 C
1977
5.6 C
-0.11 C
1978
4.9 C
-0.84 C
1979
6.4 C
+0.69 C
1980
5.0 C
-0.75 C
1981
6.6 C
+0.87 C
1982
5.3 C
-0.45 C
1983
6.4 C
+0.72 C
The fitted trend in annual mean temperature here over 1943 to 1983 is -0.1 C (-0.3 to 0.1) per decade. The interval includes zero, so the trend is not clearly different from zero. In Fahrenheit: -0.2 F (-0.5 to 0.1) per decade. The slope is a straight line fitted to 38 complete years; the brackets give its 95 percent interval.
Fitted temperature trends per decade at Summerside A
Measure
Per decade (C)
Per decade (F)
Period
Complete years
Reading
Annual mean temperature
-0.1 C (-0.3 to 0.1) per decade
-0.2 F (-0.5 to 0.1) per decade
1943 to 1983
38
Not clearly different from zero
Mean daily maximum
-0.1 C (-0.3 to 0.1) per decade
-0.1 F (-0.5 to 0.2) per decade
1943 to 1983
38
Not clearly different from zero
Mean daily minimum
-0.2 C (-0.4 to 0.1) per decade
-0.3 F (-0.7 to 0.1) per decade
1943 to 1983
38
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
1942 to 1983
Yearly extremes at Summerside A: the record and the median year
Measure
Record
Year of the record
Median year
Years with a value
Hottest day (TXx)
33.3 C (91.9 F)
1944
30.3 C (86.5 F)
42
Coldest night (TNn)
-29.9 C (-21.8 F)
1982
-23.9 C (-11.0 F)
42
Wettest day (Rx1day)
111.8 mm (4.4 in)
1948
45.5 mm (1.8 in)
42
Wettest five days (Rx5day)
165.7 mm (6.5 in)
1942
74.7 mm (2.9 in)
42
Longest dry spell (CDD)
26 days
1947
14 days
42
Hottest day (TXx)
The hottest day of the year at Summerside A, 1942 to 1983. The record is 33.3 C (91.9 F) in 1944, marked on the chart; the median year is 30.3 C (86.5 F).
Hottest day (TXx) at Summerside A by year
Year
Hottest day (TXx)
1942
31.7 C (89.1 F)
1943
30.6 C (87.1 F)
1944
33.3 C (91.9 F)
1945
30.6 C (87.1 F)
1946
30.6 C (87.1 F)
1947
32.2 C (90.0 F)
1948
28.9 C (84.0 F)
1949
32.2 C (90.0 F)
1950
28.9 C (84.0 F)
1951
28.3 C (82.9 F)
1952
31.7 C (89.1 F)
1953
31.7 C (89.1 F)
1954
28.9 C (84.0 F)
1955
30.6 C (87.1 F)
1956
27.8 C (82.0 F)
1957
28.3 C (82.9 F)
1958
28.3 C (82.9 F)
1959
30.0 C (86.0 F)
1960
33.3 C (91.9 F)
1961
29.4 C (84.9 F)
1962
28.9 C (84.0 F)
1963
33.3 C (91.9 F)
1964
28.3 C (82.9 F)
1965
28.9 C (84.0 F)
1966
28.9 C (84.0 F)
1967
29.4 C (84.9 F)
1968
31.1 C (88.0 F)
1969
29.4 C (84.9 F)
1970
30.6 C (87.1 F)
1971
28.9 C (84.0 F)
1972
28.3 C (82.9 F)
1973
31.7 C (89.1 F)
1974
29.4 C (84.9 F)
1975
32.8 C (91.0 F)
1976
32.8 C (91.0 F)
1977
32.0 C (89.6 F)
1978
30.5 C (86.9 F)
1979
30.8 C (87.4 F)
1980
30.1 C (86.2 F)
1981
29.9 C (85.8 F)
1982
30.4 C (86.7 F)
1983
29.5 C (85.1 F)
Coldest night (TNn)
The coldest night of the year at Summerside A, 1942 to 1983. The record is -29.9 C (-21.8 F) in 1982, marked on the chart; the median year is -23.9 C (-11.0 F).
Coldest night (TNn) at Summerside A by year
Year
Coldest night (TNn)
1942
-24.4 C (-11.9 F)
1943
-26.1 C (-15.0 F)
1944
-23.3 C (-9.9 F)
1945
-22.8 C (-9.0 F)
1946
-26.1 C (-15.0 F)
1947
-23.9 C (-11.0 F)
1948
-14.4 C (6.1 F)
1949
-20.6 C (-5.1 F)
1950
-25.0 C (-13.0 F)
1951
-26.7 C (-16.1 F)
1952
-22.2 C (-8.0 F)
1953
-18.3 C (-0.9 F)
1954
-23.9 C (-11.0 F)
1955
-25.0 C (-13.0 F)
1956
-21.7 C (-7.1 F)
1957
-27.2 C (-17.0 F)
1958
-20.6 C (-5.1 F)
1959
-23.3 C (-9.9 F)
1960
-23.9 C (-11.0 F)
1961
-25.0 C (-13.0 F)
1962
-25.0 C (-13.0 F)
1963
-22.2 C (-8.0 F)
1964
-19.4 C (-2.9 F)
1965
-25.0 C (-13.0 F)
1966
-25.0 C (-13.0 F)
1967
-26.1 C (-15.0 F)
1968
-24.4 C (-11.9 F)
1969
-19.4 C (-2.9 F)
1970
-21.7 C (-7.1 F)
1971
-25.0 C (-13.0 F)
1972
-26.1 C (-15.0 F)
1973
-24.4 C (-11.9 F)
1974
-25.6 C (-14.1 F)
1975
-23.9 C (-11.0 F)
1976
-23.9 C (-11.0 F)
1977
-22.9 C (-9.2 F)
1978
-21.8 C (-7.2 F)
1979
-23.4 C (-10.1 F)
1980
-25.2 C (-13.4 F)
1981
-27.5 C (-17.5 F)
1982
-29.9 C (-21.8 F)
1983
-20.0 C (-4.0 F)
Wettest day (Rx1day)
The wettest day of the year at Summerside A, 1942 to 1983. The record is 111.8 mm (4.4 in) in 1948, marked on the chart; the median year is 45.5 mm (1.8 in).
Wettest day (Rx1day) at Summerside A by year
Year
Wettest day (Rx1day)
1942
109.2 mm (4.3 in)
1943
38.4 mm (1.5 in)
1944
91.2 mm (3.6 in)
1945
57.7 mm (2.3 in)
1946
39.6 mm (1.6 in)
1947
37.8 mm (1.5 in)
1948
111.8 mm (4.4 in)
1949
34.3 mm (1.4 in)
1950
52.1 mm (2.1 in)
1951
58.7 mm (2.3 in)
1952
42.7 mm (1.7 in)
1953
74.7 mm (2.9 in)
1954
33.8 mm (1.3 in)
1955
30.5 mm (1.2 in)
1956
57.4 mm (2.3 in)
1957
46.7 mm (1.8 in)
1958
40.1 mm (1.6 in)
1959
49.5 mm (1.9 in)
1960
47.0 mm (1.9 in)
1961
52.8 mm (2.1 in)
1962
87.6 mm (3.4 in)
1963
45.2 mm (1.8 in)
1964
29.5 mm (1.2 in)
1965
25.7 mm (1.0 in)
1966
30.5 mm (1.2 in)
1967
45.7 mm (1.8 in)
1968
69.3 mm (2.7 in)
1969
28.4 mm (1.1 in)
1970
60.2 mm (2.4 in)
1971
42.9 mm (1.7 in)
1972
39.4 mm (1.6 in)
1973
39.1 mm (1.5 in)
1974
54.6 mm (2.1 in)
1975
36.6 mm (1.4 in)
1976
45.7 mm (1.8 in)
1977
42.8 mm (1.7 in)
1978
71.1 mm (2.8 in)
1979
71.4 mm (2.8 in)
1980
43.4 mm (1.7 in)
1981
37.7 mm (1.5 in)
1982
38.0 mm (1.5 in)
1983
54.8 mm (2.2 in)
Wettest five days (Rx5day)
The wettest five days of the year at Summerside A, 1942 to 1983. The record is 165.7 mm (6.5 in) in 1942, marked on the chart; the median year is 74.7 mm (2.9 in).
Wettest five days (Rx5day) at Summerside A by year
Year
Wettest five days (Rx5day)
1942
165.7 mm (6.5 in)
1943
73.1 mm (2.9 in)
1944
126.4 mm (5.0 in)
1945
77.5 mm (3.1 in)
1946
46.2 mm (1.8 in)
1947
74.9 mm (2.9 in)
1948
118.7 mm (4.7 in)
1949
71.3 mm (2.8 in)
1950
91.3 mm (3.6 in)
1951
73.6 mm (2.9 in)
1952
76.2 mm (3.0 in)
1953
86.6 mm (3.4 in)
1954
50.3 mm (2.0 in)
1955
55.3 mm (2.2 in)
1956
149.6 mm (5.9 in)
1957
83.0 mm (3.3 in)
1958
65.2 mm (2.6 in)
1959
91.9 mm (3.6 in)
1960
58.0 mm (2.3 in)
1961
92.2 mm (3.6 in)
1962
96.5 mm (3.8 in)
1963
71.9 mm (2.8 in)
1964
62.5 mm (2.5 in)
1965
51.8 mm (2.0 in)
1966
53.5 mm (2.1 in)
1967
71.1 mm (2.8 in)
1968
77.9 mm (3.1 in)
1969
51.5 mm (2.0 in)
1970
80.8 mm (3.2 in)
1971
71.9 mm (2.8 in)
1972
107.7 mm (4.2 in)
1973
74.4 mm (2.9 in)
1974
67.6 mm (2.7 in)
1975
54.1 mm (2.1 in)
1976
53.3 mm (2.1 in)
1977
78.8 mm (3.1 in)
1978
104.1 mm (4.1 in)
1979
83.8 mm (3.3 in)
1980
66.3 mm (2.6 in)
1981
88.4 mm (3.5 in)
1982
76.0 mm (3.0 in)
1983
68.4 mm (2.7 in)
Longest dry spell (CDD)
The longest dry spell of the year at Summerside A, 1942 to 1983. The record is 26 days in 1947, marked on the chart; the median year is 14 days.
Longest dry spell (CDD) at Summerside A by year
Year
Longest dry spell (CDD)
1942
18 days
1943
11 days
1944
14 days
1945
16 days
1946
17 days
1947
26 days
1948
15 days
1949
13 days
1950
17 days
1951
13 days
1952
18 days
1953
14 days
1954
15 days
1955
14 days
1956
15 days
1957
14 days
1958
8 days
1959
14 days
1960
20 days
1961
24 days
1962
12 days
1963
14 days
1964
22 days
1965
23 days
1966
12 days
1967
15 days
1968
17 days
1969
19 days
1970
14 days
1971
14 days
1972
11 days
1973
12 days
1974
14 days
1975
14 days
1976
12 days
1977
12 days
1978
15 days
1979
17 days
1980
22 days
1981
14 days
1982
16 days
1983
9 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
38 years with a frost
Across 38 years with a frost, the median last spring frost at Summerside A falls on 8 May and the median first autumn frost on 20 October, which leaves a median of 165 days between them.
Fitted over all years, the growing season changes by +3.2 days per decade at this station.
Frost dates and growing season at Summerside A
Measure
Median, all years
Earliest period
Recent period (1954 to 1983)
Recent against earliest
Fitted trend
Last spring frost
8 May
n/a
6 May
n/a
-2.8 days per decade
First autumn frost
20 October
n/a
20 October
n/a
+0.5 days per decade
Growing days
165 days
n/a
166 days
n/a
+3.2 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
40 years, 1943 to 1983
A day with at least 44.7 mm (1.8 in) of rain is expected about once in 2 years. A day with at least 104.3 mm (4.1 in) of rain is expected about once in 100 years.
Rainfall return levels at Summerside 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
44.7 mm (1.8 in)
5 years
58.6 mm (2.3 in)
10 years
68.5 mm (2.7 in)
25 years
82.1 mm (3.2 in)
50 years
92.9 mm (3.7 in)
Longer than the 40 years of record
100 years
104.3 mm (4.1 in)
Longer than the 40 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, 40 years of values from 1943 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: 91.2 mm (3.6 in) in 1944; 87.6 mm (3.4 in) in 1962; 74.7 mm (2.9 in) in 1953.
Download the Data
Data for Summerside A standing records by year: CSV or JSON. Field meanings are on the data page.
Data for Summerside 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.