Record envelope, standing records and threshold days for St John's A (CA008403506), Newfoundland and Labrador, Canada, with 71 years of record.
Key Facts for St John's A
St John's A (CA008403506) is a weather station in Newfoundland and Labrador, Canada at 47.62 latitude and -52.75 longitude, 141 m (463 ft) above sea level.
The station reports from 1942 to 2012, 71 years of record.
1,464 records set at St John's A still stand.
Records are tracked for tmax, tmin, prcp, snow: an element needs 30 years of data to be eligible.
St John's A set a daily record high maximum temperature of 10.6 C (51.1 F) on 29 December 1983.
About the Station
Location: Newfoundland and Labrador, Canada, 47.62 latitude, -52.75 longitude.
Elevation: 141 m (463 ft).
Period of record: 1942 to 2012, 71 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 St John's 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 St John's A, with 2026 drawn through them
Month
Highest record high
Lowest record low
2026 highest maximum
2026 lowest minimum
Jan
15.2 C (59.4 F)
-23.3 C (-9.9 F)
n/a
n/a
Feb
13.7 C (56.7 F)
-23.3 C (-9.9 F)
n/a
n/a
Mar
18.3 C (64.9 F)
-20.6 C (-5.1 F)
n/a
n/a
Apr
21.7 C (71.1 F)
-14.8 C (5.4 F)
n/a
n/a
May
25.6 C (78.1 F)
-6.7 C (19.9 F)
n/a
n/a
Jun
29.4 C (84.9 F)
-3.3 C (26.1 F)
n/a
n/a
Jul
31.5 C (88.7 F)
-1.1 C (30.0 F)
n/a
n/a
Aug
30.0 C (86.0 F)
0.5 C (32.9 F)
n/a
n/a
Sep
27.8 C (82.0 F)
-1.1 C (30.0 F)
n/a
n/a
Oct
22.8 C (73.0 F)
-5.6 C (21.9 F)
n/a
n/a
Nov
19.4 C (66.9 F)
-12.6 C (9.3 F)
n/a
n/a
Dec
16.1 C (61.0 F)
-19.4 C (-2.9 F)
n/a
n/a
Which Years Hold Standing Records
1,464 standing records
Year with most
1,464 records at St John's A still stand. 1972 holds the most, with 64.
Standing records at St John's A by the year they were set
Year set
Standing records
1942
39
1943
36
1944
46
1945
33
1946
36
1947
41
1948
42
1949
44
1950
30
1951
44
1952
15
1953
33
1954
56
1955
29
1956
36
1957
42
1958
27
1959
33
1960
18
1961
32
1962
22
1963
25
1964
28
1965
21
1966
10
1967
36
1968
31
1969
22
1970
48
1971
32
1972
64
1973
25
1974
33
1975
30
1976
46
1977
28
1978
56
1979
58
1980
25
1981
27
1982
33
1983
52
All-Time Record Progression
2 new records
2 all-time records were set at St John's A between 4 February 1975 and 6 July 1983. Each dot is a new record.
When St John's A set new all-time records
Date
Kind
Detail
1975-02-04
Record low maximum temperature
Record low maximum temperature -20.0 C (-4.0 F)
1983-07-06
Record high maximum temperature
Record high maximum temperature 31.5 C (88.7 F)
Wettest Day of Each Month
Jul: 121.2 mm (4.8 in)
The wettest day on record for each calendar month at St John's A. The most was 121.2 mm (4.8 in) on 27 July 1946.
Record daily precipitation for each month at St John's A
Month
Record daily precipitation (mm)
Date
Jan
84.6 mm (3.3 in)
30 January 1942
Feb
68.3 mm (2.7 in)
22 February 1973
Mar
53.3 mm (2.1 in)
1 March 1962
Apr
91.7 mm (3.6 in)
11 April 1951
May
50.8 mm (2.0 in)
30 May 1948
Jun
75.2 mm (3.0 in)
24 June 1945
Jul
121.2 mm (4.8 in)
27 July 1946
Aug
80.5 mm (3.2 in)
23 August 1975
Sep
84.0 mm (3.3 in)
18 September 1982
Oct
100.8 mm (4.0 in)
4 October 1942
Nov
76.5 mm (3.0 in)
5 November 1964
Dec
85.1 mm (3.4 in)
26 December 1953
Period of Record Coverage
1942 to 1983
Complete yearUnder 90 percent of days
42 years of record at St John's A, 1942 to 1983. Every year has data for at least 90 percent of its days.
Cooler than the station meanWarmer than the station mean
One stripe for each of 42 complete years at St John's A, 1942 to 1983. Blue stripes are years cooler than the station's own mean of 4.8 C (40.6 F); red stripes are warmer. The coolest year was 1972, at 3.7 C (38.6 F), and the warmest was 1951, at 6.1 C (43.0 F). The strongest colour marks a difference of 1.4 C (2.5 F).
Annual mean temperature at St John's A as warming stripes, 1942 to 1983
Year
Annual mean temperature
Difference from the station mean
1942
5.1 C
+0.30 C
1943
4.5 C
-0.32 C
1944
4.8 C
-0.02 C
1945
4.6 C
-0.16 C
1946
5.0 C
+0.17 C
1947
4.5 C
-0.26 C
1948
3.9 C
-0.94 C
1949
4.8 C
+0.02 C
1950
4.3 C
-0.47 C
1951
6.1 C
+1.33 C
1952
5.8 C
+1.00 C
1953
5.5 C
+0.71 C
1954
5.2 C
+0.44 C
1955
4.5 C
-0.34 C
1956
4.7 C
-0.09 C
1957
4.1 C
-0.69 C
1958
5.6 C
+0.80 C
1959
3.9 C
-0.91 C
1960
5.3 C
+0.54 C
1961
5.0 C
+0.18 C
1962
4.5 C
-0.29 C
1963
4.6 C
-0.20 C
1964
4.1 C
-0.70 C
1965
4.5 C
-0.34 C
1966
5.5 C
+0.74 C
1967
5.5 C
+0.73 C
1968
4.4 C
-0.43 C
1969
5.5 C
+0.71 C
1970
5.5 C
+0.66 C
1971
5.4 C
+0.58 C
1972
3.7 C
-1.14 C
1973
4.9 C
+0.12 C
1974
3.7 C
-1.06 C
1975
4.0 C
-0.83 C
1976
4.9 C
+0.14 C
1977
4.8 C
+0.04 C
1978
4.1 C
-0.73 C
1979
5.3 C
+0.48 C
1980
4.0 C
-0.77 C
1981
5.9 C
+1.06 C
1982
4.2 C
-0.59 C
1983
5.4 C
+0.64 C
The fitted trend in annual mean temperature here over 1942 to 1983 is -0.03 C (-0.19 to 0.14) per decade. The interval includes zero, so the trend is not clearly different from zero. In Fahrenheit: -0.05 F (-0.35 to 0.25) per decade. The slope is a straight line fitted to 42 complete years; the brackets give its 95 percent interval.
Fitted temperature trends per decade at St John's A
Measure
Per decade (C)
Per decade (F)
Period
Complete years
Reading
Annual mean temperature
-0.03 C (-0.19 to 0.14) per decade
-0.05 F (-0.35 to 0.25) per decade
1942 to 1983
42
Not clearly different from zero
Mean daily maximum
0.01 C (-0.15 to 0.18) per decade
0.02 F (-0.28 to 0.33) per decade
1942 to 1983
42
Not clearly different from zero
Mean daily minimum
-0.1 C (-0.3 to 0.1) per decade
-0.1 F (-0.5 to 0.2) per decade
1942 to 1983
42
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 St John's A: the record and the median year
Measure
Record
Year of the record
Median year
Years with a value
Hottest day (TXx)
31.5 C (88.7 F)
1983
27.8 C (82.0 F)
42
Coldest night (TNn)
-23.3 C (-9.9 F)
1950
-17.8 C (0.0 F)
42
Wettest day (Rx1day)
121.2 mm (4.8 in)
1946
62.4 mm (2.5 in)
42
Wettest five days (Rx5day)
180.7 mm (7.1 in)
1951
103.7 mm (4.1 in)
42
Longest dry spell (CDD)
15 days
1967
11 days
42
Hottest day (TXx)
The hottest day of the year at St John's A, 1942 to 1983. The record is 31.5 C (88.7 F) in 1983, marked on the chart; the median year is 27.8 C (82.0 F).
Hottest day (TXx) at St John's A by year
Year
Hottest day (TXx)
1942
25.6 C (78.1 F)
1943
27.2 C (81.0 F)
1944
30.0 C (86.0 F)
1945
28.3 C (82.9 F)
1946
27.2 C (81.0 F)
1947
29.4 C (84.9 F)
1948
27.8 C (82.0 F)
1949
28.3 C (82.9 F)
1950
26.7 C (80.1 F)
1951
27.8 C (82.0 F)
1952
28.9 C (84.0 F)
1953
27.2 C (81.0 F)
1954
26.7 C (80.1 F)
1955
26.7 C (80.1 F)
1956
26.1 C (79.0 F)
1957
27.2 C (81.0 F)
1958
25.6 C (78.1 F)
1959
27.8 C (82.0 F)
1960
27.2 C (81.0 F)
1961
28.9 C (84.0 F)
1962
26.7 C (80.1 F)
1963
30.6 C (87.1 F)
1964
27.2 C (81.0 F)
1965
27.8 C (82.0 F)
1966
26.7 C (80.1 F)
1967
28.9 C (84.0 F)
1968
28.9 C (84.0 F)
1969
26.1 C (79.0 F)
1970
28.3 C (82.9 F)
1971
27.8 C (82.0 F)
1972
27.8 C (82.0 F)
1973
27.8 C (82.0 F)
1974
27.8 C (82.0 F)
1975
29.4 C (84.9 F)
1976
27.8 C (82.0 F)
1977
28.5 C (83.3 F)
1978
28.6 C (83.5 F)
1979
29.6 C (85.3 F)
1980
26.8 C (80.2 F)
1981
28.2 C (82.8 F)
1982
30.2 C (86.4 F)
1983
31.5 C (88.7 F)
Coldest night (TNn)
The coldest night of the year at St John's A, 1942 to 1983. The record is -23.3 C (-9.9 F) in 1950, marked on the chart; the median year is -17.8 C (0.0 F).
Coldest night (TNn) at St John's A by year
Year
Coldest night (TNn)
1942
-17.2 C (1.0 F)
1943
-17.8 C (0.0 F)
1944
-20.0 C (-4.0 F)
1945
-16.7 C (1.9 F)
1946
-17.8 C (0.0 F)
1947
-20.0 C (-4.0 F)
1948
-20.6 C (-5.1 F)
1949
-18.9 C (-2.0 F)
1950
-23.3 C (-9.9 F)
1951
-20.6 C (-5.1 F)
1952
-15.0 C (5.0 F)
1953
-13.3 C (8.1 F)
1954
-16.1 C (3.0 F)
1955
-16.1 C (3.0 F)
1956
-15.6 C (3.9 F)
1957
-23.3 C (-9.9 F)
1958
-15.6 C (3.9 F)
1959
-21.7 C (-7.1 F)
1960
-15.6 C (3.9 F)
1961
-21.1 C (-6.0 F)
1962
-16.1 C (3.0 F)
1963
-18.9 C (-2.0 F)
1964
-17.2 C (1.0 F)
1965
-16.7 C (1.9 F)
1966
-15.6 C (3.9 F)
1967
-17.8 C (0.0 F)
1968
-15.0 C (5.0 F)
1969
-11.7 C (10.9 F)
1970
-16.1 C (3.0 F)
1971
-21.1 C (-6.0 F)
1972
-22.2 C (-8.0 F)
1973
-17.2 C (1.0 F)
1974
-17.8 C (0.0 F)
1975
-23.3 C (-9.9 F)
1976
-16.7 C (1.9 F)
1977
-20.0 C (-4.0 F)
1978
-18.3 C (-0.9 F)
1979
-18.6 C (-1.5 F)
1980
-19.7 C (-3.5 F)
1981
-16.8 C (1.8 F)
1982
-19.4 C (-2.9 F)
1983
-20.3 C (-4.5 F)
Wettest day (Rx1day)
The wettest day of the year at St John's A, 1942 to 1983. The record is 121.2 mm (4.8 in) in 1946, marked on the chart; the median year is 62.4 mm (2.5 in).
Wettest day (Rx1day) at St John's A by year
Year
Wettest day (Rx1day)
1942
100.8 mm (4.0 in)
1943
50.8 mm (2.0 in)
1944
87.1 mm (3.4 in)
1945
75.2 mm (3.0 in)
1946
121.2 mm (4.8 in)
1947
44.7 mm (1.8 in)
1948
60.7 mm (2.4 in)
1949
56.1 mm (2.2 in)
1950
68.3 mm (2.7 in)
1951
91.7 mm (3.6 in)
1952
66.0 mm (2.6 in)
1953
92.5 mm (3.6 in)
1954
62.0 mm (2.4 in)
1955
64.0 mm (2.5 in)
1956
64.0 mm (2.5 in)
1957
45.0 mm (1.8 in)
1958
61.5 mm (2.4 in)
1959
58.7 mm (2.3 in)
1960
64.3 mm (2.5 in)
1961
51.1 mm (2.0 in)
1962
53.3 mm (2.1 in)
1963
56.4 mm (2.2 in)
1964
76.5 mm (3.0 in)
1965
41.4 mm (1.6 in)
1966
65.5 mm (2.6 in)
1967
48.5 mm (1.9 in)
1968
55.4 mm (2.2 in)
1969
46.5 mm (1.8 in)
1970
73.4 mm (2.9 in)
1971
60.2 mm (2.4 in)
1972
70.1 mm (2.8 in)
1973
68.3 mm (2.7 in)
1974
62.7 mm (2.5 in)
1975
80.5 mm (3.2 in)
1976
51.3 mm (2.0 in)
1977
42.4 mm (1.7 in)
1978
43.0 mm (1.7 in)
1979
47.6 mm (1.9 in)
1980
63.0 mm (2.5 in)
1981
82.6 mm (3.3 in)
1982
84.0 mm (3.3 in)
1983
52.8 mm (2.1 in)
Wettest five days (Rx5day)
The wettest five days of the year at St John's A, 1942 to 1983. The record is 180.7 mm (7.1 in) in 1951, marked on the chart; the median year is 103.7 mm (4.1 in).
Wettest five days (Rx5day) at St John's A by year
Year
Wettest five days (Rx5day)
1942
152.0 mm (6.0 in)
1943
132.9 mm (5.2 in)
1944
122.6 mm (4.8 in)
1945
114.5 mm (4.5 in)
1946
130.6 mm (5.1 in)
1947
130.1 mm (5.1 in)
1948
124.2 mm (4.9 in)
1949
70.1 mm (2.8 in)
1950
80.3 mm (3.2 in)
1951
180.7 mm (7.1 in)
1952
106.8 mm (4.2 in)
1953
110.3 mm (4.3 in)
1954
99.3 mm (3.9 in)
1955
125.5 mm (4.9 in)
1956
133.4 mm (5.3 in)
1957
86.9 mm (3.4 in)
1958
67.1 mm (2.6 in)
1959
101.8 mm (4.0 in)
1960
79.0 mm (3.1 in)
1961
97.3 mm (3.8 in)
1962
112.8 mm (4.4 in)
1963
74.2 mm (2.9 in)
1964
100.2 mm (3.9 in)
1965
77.0 mm (3.0 in)
1966
115.5 mm (4.5 in)
1967
80.8 mm (3.2 in)
1968
105.5 mm (4.2 in)
1969
83.6 mm (3.3 in)
1970
138.5 mm (5.5 in)
1971
134.6 mm (5.3 in)
1972
130.9 mm (5.2 in)
1973
87.7 mm (3.5 in)
1974
93.5 mm (3.7 in)
1975
94.0 mm (3.7 in)
1976
86.6 mm (3.4 in)
1977
96.5 mm (3.8 in)
1978
82.5 mm (3.2 in)
1979
96.8 mm (3.8 in)
1980
113.2 mm (4.5 in)
1981
150.1 mm (5.9 in)
1982
126.8 mm (5.0 in)
1983
83.8 mm (3.3 in)
Longest dry spell (CDD)
The longest dry spell of the year at St John's A, 1942 to 1983. The record is 15 days in 1967, marked on the chart; the median year is 11 days.
Longest dry spell (CDD) at St John's A by year
Year
Longest dry spell (CDD)
1942
13 days
1943
8 days
1944
11 days
1945
9 days
1946
13 days
1947
12 days
1948
10 days
1949
11 days
1950
11 days
1951
9 days
1952
14 days
1953
11 days
1954
9 days
1955
9 days
1956
9 days
1957
10 days
1958
13 days
1959
10 days
1960
14 days
1961
14 days
1962
14 days
1963
8 days
1964
7 days
1965
13 days
1966
10 days
1967
15 days
1968
10 days
1969
9 days
1970
12 days
1971
10 days
1972
13 days
1973
11 days
1974
13 days
1975
11 days
1976
10 days
1977
10 days
1978
8 days
1979
14 days
1980
8 days
1981
11 days
1982
12 days
1983
8 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
42 years with a frost
Across 42 years with a frost, the median last spring frost at St John's A falls on 5 June and the median first autumn frost on 13 October, which leaves a median of 130 days between them.
Fitted over all years, the growing season changes by -1.3 days per decade at this station.
Frost dates and growing season at St John's A
Measure
Median, all years
Earliest period
Recent period (1954 to 1983)
Recent against earliest
Fitted trend
Last spring frost
5 June
n/a
3 June
n/a
-1.0 days per decade
First autumn frost
13 October
n/a
15 October
n/a
-2.4 days per decade
Growing days
130 days
n/a
136 days
n/a
-1.3 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
42 years, 1942 to 1983
A day with at least 61.2 mm (2.4 in) of rain is expected about once in 2 years. A day with at least 123.5 mm (4.9 in) of rain is expected about once in 100 years.
Rainfall return levels at St John's 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
61.2 mm (2.4 in)
5 years
76.6 mm (3.0 in)
10 years
87.2 mm (3.4 in)
25 years
101.3 mm (4.0 in)
50 years
112.3 mm (4.4 in)
Longer than the 42 years of record
100 years
123.5 mm (4.9 in)
Longer than the 42 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, 42 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: 121.2 mm (4.8 in) in 1946; 100.8 mm (4.0 in) in 1942; 92.5 mm (3.6 in) in 1953.
Download the Data
Data for St John's A standing records by year: CSV or JSON. Field meanings are on the data page.
Data for St John's 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 2026-10-16 (16 October 2026). Records are computed by this site and are not official.