Record envelope, standing records and threshold days for Stephenville A (CA008403800), Newfoundland and Labrador, Canada, with 84 years of record.
Key Facts for Stephenville A
Stephenville A (CA008403800) is a weather station in Newfoundland and Labrador, Canada at 48.53 latitude and -58.55 longitude, 25 m (82 ft) above sea level.
The station reports from 1942 to 2025, 84 years of record.
1,464 records set at Stephenville A still stand.
Records are tracked for tmax, tmin, prcp, snow, snwd: an element needs 30 years of data to be eligible.
Stephenville A set a daily record snowfall of 11.5 cm (4.5 in) on 25 December 1983.
About the Station
Location: Newfoundland and Labrador, Canada, 48.53 latitude, -58.55 longitude.
Elevation: 25 m (82 ft).
Period of record: 1942 to 2025, 84 years.
Eligible elements: tmax, tmin, prcp, snow, snwd.
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 Stephenville 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 Stephenville A, with 2026 drawn through them
Month
Highest record high
Lowest record low
2026 highest maximum
2026 lowest minimum
Jan
12.2 C (54.0 F)
-26.1 C (-15.0 F)
n/a
n/a
Feb
12.2 C (54.0 F)
-27.2 C (-17.0 F)
n/a
n/a
Mar
17.2 C (63.0 F)
-23.3 C (-9.9 F)
n/a
n/a
Apr
20.0 C (68.0 F)
-14.4 C (6.1 F)
n/a
n/a
May
27.2 C (81.0 F)
-6.1 C (21.0 F)
n/a
n/a
Jun
30.0 C (86.0 F)
-1.1 C (30.0 F)
n/a
n/a
Jul
30.6 C (87.1 F)
3.9 C (39.0 F)
n/a
n/a
Aug
28.3 C (82.9 F)
2.2 C (36.0 F)
n/a
n/a
Sep
27.8 C (82.0 F)
-0.6 C (30.9 F)
n/a
n/a
Oct
22.2 C (72.0 F)
-5.6 C (21.9 F)
n/a
n/a
Nov
20.6 C (69.1 F)
-12.2 C (10.0 F)
n/a
n/a
Dec
16.1 C (61.0 F)
-18.3 C (-0.9 F)
n/a
n/a
Which Years Hold Standing Records
1,464 standing records
Year with most
1,464 records at Stephenville A still stand. 1972 holds the most, with 62.
Standing records at Stephenville A by the year they were set
Year set
Standing records
1942
30
1943
43
1944
39
1945
21
1946
26
1947
41
1948
29
1949
27
1950
42
1951
54
1952
25
1953
30
1954
50
1955
26
1956
51
1957
36
1958
36
1959
35
1960
31
1961
52
1962
14
1963
43
1964
31
1965
24
1966
26
1967
36
1968
28
1969
35
1970
32
1971
27
1972
62
1973
20
1974
37
1975
23
1976
43
1977
31
1978
31
1979
48
1980
17
1981
39
1982
32
1983
61
All-Time Record Progression
2 new records
2 all-time records were set at Stephenville A between 31 January 1973 and 17 July 1979. Each dot is a new record.
When Stephenville A set new all-time records
Date
Kind
Detail
1973-01-31
Record daily snowfall
Record daily snowfall 56.1 cm (22.1 in)
1979-07-17
Record daily precipitation
Record daily precipitation 84.1 mm (3.3 in)
Wettest Day of Each Month
Jul: 84.1 mm (3.3 in)
The wettest day on record for each calendar month at Stephenville A. The most was 84.1 mm (3.3 in) on 17 July 1979.
Record daily precipitation for each month at Stephenville A
Month
Record daily precipitation (mm)
Date
Jan
58.8 mm (2.3 in)
8 January 1979
Feb
77.5 mm (3.1 in)
14 February 1948
Mar
50.8 mm (2.0 in)
20 March 1968
Apr
37.7 mm (1.5 in)
6 April 1981
May
58.9 mm (2.3 in)
22 May 1954
Jun
67.6 mm (2.7 in)
1 June 1983
Jul
84.1 mm (3.3 in)
17 July 1979
Aug
56.0 mm (2.2 in)
7 August 1983
Sep
81.0 mm (3.2 in)
21 September 1955
Oct
49.8 mm (2.0 in)
2 October 1957
Nov
70.1 mm (2.8 in)
7 November 1958
Dec
47.8 mm (1.9 in)
31 December 1952
Period of Record Coverage
1942 to 1983
Complete yearUnder 90 percent of days
42 years of record at Stephenville A, 1942 to 1983. 1 years have data for under 90 percent of days and are left out of rankings: 1942.
Cooler than the station meanWarmer than the station mean
One stripe for each of 38 complete years at Stephenville A, 1943 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 2.9 C (37.2 F), and the warmest was 1951, at 6.3 C (43.4 F). The strongest colour marks a difference of 1.9 C (3.4 F).
Annual mean temperature at Stephenville A as warming stripes, 1943 to 1983
Year
Annual mean temperature
Difference from the station mean
1943
4.1 C
-0.72 C
1944
4.5 C
-0.26 C
1945
4.8 C
-0.01 C
1947
4.6 C
-0.25 C
1949
4.9 C
+0.08 C
1950
4.2 C
-0.57 C
1951
6.3 C
+1.51 C
1952
6.0 C
+1.24 C
1953
6.0 C
+1.15 C
1954
5.6 C
+0.78 C
1955
5.4 C
+0.57 C
1956
5.0 C
+0.16 C
1957
4.1 C
-0.69 C
1958
5.7 C
+0.94 C
1959
4.2 C
-0.59 C
1960
5.9 C
+1.10 C
1961
4.9 C
+0.14 C
1962
4.7 C
-0.10 C
1963
4.3 C
-0.47 C
1964
3.8 C
-0.97 C
1965
4.1 C
-0.67 C
1967
4.9 C
+0.05 C
1968
4.6 C
-0.18 C
1969
5.6 C
+0.75 C
1970
5.0 C
+0.21 C
1971
4.8 C
+0.03 C
1972
2.9 C
-1.89 C
1973
4.8 C
0.00 C
1974
3.2 C
-1.58 C
1975
4.0 C
-0.81 C
1976
4.3 C
-0.53 C
1977
4.7 C
-0.07 C
1978
4.1 C
-0.68 C
1979
5.8 C
+1.04 C
1980
4.5 C
-0.33 C
1981
6.2 C
+1.41 C
1982
4.0 C
-0.78 C
1983
5.9 C
+1.13 C
The fitted trend in annual mean temperature here over 1943 to 1983 is -0.1 C (-0.3 to 0.2) per decade. The interval includes zero, so the trend is not clearly different from zero. In Fahrenheit: -0.1 F (-0.6 to 0.3) 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 Stephenville A
Measure
Per decade (C)
Per decade (F)
Period
Complete years
Reading
Annual mean temperature
-0.1 C (-0.3 to 0.2) per decade
-0.1 F (-0.6 to 0.3) per decade
1943 to 1983
38
Not clearly different from zero
Mean daily maximum
-0.01 C (-0.23 to 0.21) per decade
-0.02 F (-0.41 to 0.37) 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 (-0.8 to 0.2) 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 Stephenville A: the record and the median year
Measure
Record
Year of the record
Median year
Years with a value
Hottest day (TXx)
30.6 C (87.1 F)
1949
26.7 C (80.1 F)
42
Coldest night (TNn)
-27.2 C (-17.0 F)
1961
-20.8 C (-5.5 F)
42
Wettest day (Rx1day)
84.1 mm (3.3 in)
1979
47.9 mm (1.9 in)
42
Wettest five days (Rx5day)
131.8 mm (5.2 in)
1983
79.9 mm (3.1 in)
42
Longest dry spell (CDD)
28 days
1954
13 days
42
Hottest day (TXx)
The hottest day of the year at Stephenville A, 1942 to 1983. The record is 30.6 C (87.1 F) in 1949, marked on the chart; the median year is 26.7 C (80.1 F).
Hottest day (TXx) at Stephenville A by year
Year
Hottest day (TXx)
1942
28.3 C (82.9 F)
1943
26.7 C (80.1 F)
1944
26.1 C (79.0 F)
1945
25.0 C (77.0 F)
1946
26.7 C (80.1 F)
1947
27.8 C (82.0 F)
1948
28.3 C (82.9 F)
1949
30.6 C (87.1 F)
1950
27.2 C (81.0 F)
1951
27.8 C (82.0 F)
1952
27.8 C (82.0 F)
1953
27.8 C (82.0 F)
1954
30.0 C (86.0 F)
1955
28.3 C (82.9 F)
1956
26.7 C (80.1 F)
1957
26.1 C (79.0 F)
1958
25.0 C (77.0 F)
1959
27.8 C (82.0 F)
1960
27.8 C (82.0 F)
1961
28.3 C (82.9 F)
1962
26.1 C (79.0 F)
1963
25.0 C (77.0 F)
1964
24.4 C (75.9 F)
1965
25.6 C (78.1 F)
1966
26.7 C (80.1 F)
1967
26.7 C (80.1 F)
1968
23.9 C (75.0 F)
1969
26.1 C (79.0 F)
1970
27.2 C (81.0 F)
1971
25.6 C (78.1 F)
1972
27.8 C (82.0 F)
1973
26.1 C (79.0 F)
1974
25.0 C (77.0 F)
1975
28.3 C (82.9 F)
1976
27.8 C (82.0 F)
1977
27.3 C (81.1 F)
1978
26.5 C (79.7 F)
1979
25.5 C (77.9 F)
1980
25.6 C (78.1 F)
1981
27.8 C (82.0 F)
1982
26.9 C (80.4 F)
1983
25.5 C (77.9 F)
Coldest night (TNn)
The coldest night of the year at Stephenville A, 1942 to 1983. The record is -27.2 C (-17.0 F) in 1961, marked on the chart; the median year is -20.8 C (-5.5 F).
Coldest night (TNn) at Stephenville A by year
Year
Coldest night (TNn)
1942
-17.8 C (0.0 F)
1943
-24.4 C (-11.9 F)
1944
-21.7 C (-7.1 F)
1945
-21.7 C (-7.1 F)
1946
-19.4 C (-2.9 F)
1947
-20.0 C (-4.0 F)
1948
-23.9 C (-11.0 F)
1949
-22.2 C (-8.0 F)
1950
-23.3 C (-9.9 F)
1951
-20.6 C (-5.1 F)
1952
-16.7 C (1.9 F)
1953
-16.1 C (3.0 F)
1954
-16.1 C (3.0 F)
1955
-20.0 C (-4.0 F)
1956
-15.0 C (5.0 F)
1957
-26.1 C (-15.0 F)
1958
-15.0 C (5.0 F)
1959
-23.9 C (-11.0 F)
1960
-16.7 C (1.9 F)
1961
-27.2 C (-17.0 F)
1962
-23.3 C (-9.9 F)
1963
-21.7 C (-7.1 F)
1964
-18.9 C (-2.0 F)
1965
-21.7 C (-7.1 F)
1966
-22.2 C (-8.0 F)
1967
-20.6 C (-5.1 F)
1968
-17.8 C (0.0 F)
1969
-13.9 C (7.0 F)
1970
-16.7 C (1.9 F)
1971
-23.9 C (-11.0 F)
1972
-23.9 C (-11.0 F)
1973
-23.3 C (-9.9 F)
1974
-20.0 C (-4.0 F)
1975
-25.6 C (-14.1 F)
1976
-21.1 C (-6.0 F)
1977
-23.5 C (-10.3 F)
1978
-17.9 C (-0.2 F)
1979
-22.7 C (-8.9 F)
1980
-18.5 C (-1.3 F)
1981
-16.2 C (2.8 F)
1982
-21.8 C (-7.2 F)
1983
-17.5 C (0.5 F)
Wettest day (Rx1day)
The wettest day of the year at Stephenville A, 1942 to 1983. The record is 84.1 mm (3.3 in) in 1979, marked on the chart; the median year is 47.9 mm (1.9 in).
Wettest day (Rx1day) at Stephenville A by year
Year
Wettest day (Rx1day)
1942
33.3 mm (1.3 in)
1943
72.1 mm (2.8 in)
1944
41.1 mm (1.6 in)
1945
56.1 mm (2.2 in)
1946
29.5 mm (1.2 in)
1947
53.8 mm (2.1 in)
1948
77.5 mm (3.1 in)
1949
46.5 mm (1.8 in)
1950
42.4 mm (1.7 in)
1951
63.0 mm (2.5 in)
1952
54.6 mm (2.1 in)
1953
37.1 mm (1.5 in)
1954
58.9 mm (2.3 in)
1955
81.0 mm (3.2 in)
1956
36.6 mm (1.4 in)
1957
49.8 mm (2.0 in)
1958
70.1 mm (2.8 in)
1959
47.5 mm (1.9 in)
1960
30.5 mm (1.2 in)
1961
66.0 mm (2.6 in)
1962
41.1 mm (1.6 in)
1963
37.6 mm (1.5 in)
1964
39.1 mm (1.5 in)
1965
54.4 mm (2.1 in)
1966
25.4 mm (1.0 in)
1967
45.2 mm (1.8 in)
1968
50.8 mm (2.0 in)
1969
58.7 mm (2.3 in)
1970
41.4 mm (1.6 in)
1971
54.1 mm (2.1 in)
1972
48.3 mm (1.9 in)
1973
64.5 mm (2.5 in)
1974
63.0 mm (2.5 in)
1975
41.1 mm (1.6 in)
1976
34.0 mm (1.3 in)
1977
40.2 mm (1.6 in)
1978
42.7 mm (1.7 in)
1979
84.1 mm (3.3 in)
1980
57.6 mm (2.3 in)
1981
40.4 mm (1.6 in)
1982
38.6 mm (1.5 in)
1983
67.6 mm (2.7 in)
Wettest five days (Rx5day)
The wettest five days of the year at Stephenville A, 1942 to 1983. The record is 131.8 mm (5.2 in) in 1983, marked on the chart; the median year is 79.9 mm (3.1 in).
Wettest five days (Rx5day) at Stephenville A by year
Year
Wettest five days (Rx5day)
1942
80.8 mm (3.2 in)
1943
85.0 mm (3.3 in)
1944
77.0 mm (3.0 in)
1945
98.9 mm (3.9 in)
1946
79.2 mm (3.1 in)
1947
111.4 mm (4.4 in)
1948
111.0 mm (4.4 in)
1949
89.5 mm (3.5 in)
1950
77.9 mm (3.1 in)
1951
94.8 mm (3.7 in)
1952
89.4 mm (3.5 in)
1953
67.7 mm (2.7 in)
1954
68.8 mm (2.7 in)
1955
100.9 mm (4.0 in)
1956
54.1 mm (2.1 in)
1957
65.8 mm (2.6 in)
1958
113.3 mm (4.5 in)
1959
89.4 mm (3.5 in)
1960
55.1 mm (2.2 in)
1961
82.8 mm (3.3 in)
1962
68.3 mm (2.7 in)
1963
48.5 mm (1.9 in)
1964
63.2 mm (2.5 in)
1965
87.4 mm (3.4 in)
1966
49.3 mm (1.9 in)
1967
80.5 mm (3.2 in)
1968
90.7 mm (3.6 in)
1969
76.5 mm (3.0 in)
1970
101.7 mm (4.0 in)
1971
65.8 mm (2.6 in)
1972
65.1 mm (2.6 in)
1973
117.2 mm (4.6 in)
1974
76.5 mm (3.0 in)
1975
66.2 mm (2.6 in)
1976
59.4 mm (2.3 in)
1977
80.5 mm (3.2 in)
1978
70.7 mm (2.8 in)
1979
98.5 mm (3.9 in)
1980
67.9 mm (2.7 in)
1981
63.2 mm (2.5 in)
1982
83.2 mm (3.3 in)
1983
131.8 mm (5.2 in)
Longest dry spell (CDD)
The longest dry spell of the year at Stephenville A, 1942 to 1983. The record is 28 days in 1954, marked on the chart; the median year is 13 days.
Longest dry spell (CDD) at Stephenville A by year
Year
Longest dry spell (CDD)
1942
27 days
1943
10 days
1944
12 days
1945
15 days
1946
10 days
1947
20 days
1948
15 days
1949
10 days
1950
15 days
1951
16 days
1952
22 days
1953
16 days
1954
28 days
1955
12 days
1956
10 days
1957
10 days
1958
25 days
1959
9 days
1960
15 days
1961
20 days
1962
22 days
1963
10 days
1964
11 days
1965
10 days
1966
12 days
1967
14 days
1968
13 days
1969
8 days
1970
13 days
1971
7 days
1972
10 days
1973
13 days
1974
12 days
1975
13 days
1976
16 days
1977
10 days
1978
8 days
1979
12 days
1980
16 days
1981
13 days
1982
11 days
1983
12 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 Stephenville A falls on 23 May and the median first autumn frost on 18 October, which leaves a median of 149 days between them.
Fitted over all years, the growing season changes by +3.0 days per decade at this station.
Frost dates and growing season at Stephenville A
Measure
Median, all years
Earliest period
Recent period (1953 to 1983)
Recent against earliest
Fitted trend
Last spring frost
23 May
n/a
22 May
n/a
-2.5 days per decade
First autumn frost
18 October
n/a
18 October
n/a
+0.5 days per decade
Growing days
149 days
n/a
149 days
n/a
+3.0 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 49.3 mm (1.9 in) of rain is expected about once in 2 years. A day with at least 95.6 mm (3.8 in) of rain is expected about once in 100 years.
Rainfall return levels at Stephenville 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
49.3 mm (1.9 in)
5 years
62.3 mm (2.5 in)
10 years
70.6 mm (2.8 in)
25 years
80.9 mm (3.2 in)
50 years
88.4 mm (3.5 in)
Longer than the 40 years of record
100 years
95.6 mm (3.8 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: 84.1 mm (3.3 in) in 1979; 81.0 mm (3.2 in) in 1955; 77.5 mm (3.1 in) in 1948.
Download the Data
Data for Stephenville A standing records by year: CSV or JSON. Field meanings are on the data page.
Data for Stephenville 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.