Record envelope, standing records and threshold days for Nappan Cda (CA008203700), Nova Scotia, Canada, with 116 years of record.
Key Facts for Nappan Cda
Nappan Cda (CA008203700) is a weather station in Nova Scotia, Canada at 45.77 latitude and -64.25 longitude, 20 m (66 ft) above sea level.
The station reports from 1890 to 2005, 116 years of record.
1,464 records set at Nappan Cda still stand.
Records are tracked for tmax, tmin, prcp, snow: an element needs 30 years of data to be eligible.
Nappan Cda set a daily record low maximum temperature of -14.0 C (6.8 F) on 25 December 1983.
About the Station
Location: Nova Scotia, Canada, 45.77 latitude, -64.25 longitude.
Elevation: 20 m (66 ft).
Period of record: 1890 to 2005, 116 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 Nappan Cda. 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 Nappan Cda, with 2026 drawn through them
Month
Highest record high
Lowest record low
2026 highest maximum
2026 lowest minimum
Jan
14.5 C (58.1 F)
-36.7 C (-34.1 F)
n/a
n/a
Feb
15.6 C (60.1 F)
-37.2 C (-35.0 F)
n/a
n/a
Mar
18.9 C (66.0 F)
-29.4 C (-20.9 F)
n/a
n/a
Apr
26.1 C (79.0 F)
-21.1 C (-6.0 F)
n/a
n/a
May
29.4 C (84.9 F)
-6.7 C (19.9 F)
n/a
n/a
Jun
31.7 C (89.1 F)
-3.3 C (26.1 F)
n/a
n/a
Jul
32.2 C (90.0 F)
-1.1 C (30.0 F)
n/a
n/a
Aug
34.4 C (93.9 F)
0.0 C (32.0 F)
n/a
n/a
Sep
32.2 C (90.0 F)
-4.5 C (23.9 F)
n/a
n/a
Oct
26.7 C (80.1 F)
-12.2 C (10.0 F)
n/a
n/a
Nov
23.5 C (74.3 F)
-18.9 C (-2.0 F)
n/a
n/a
Dec
17.2 C (63.0 F)
-31.1 C (-24.0 F)
n/a
n/a
Which Years Hold Standing Records
1,464 standing records
Year with most
1,464 records at Nappan Cda still stand. 1921 holds the most, with 39.
Standing records at Nappan Cda by the year they were set
Year set
Standing records
1890
8
1913
6
1914
34
1915
27
1916
35
1917
25
1918
28
1919
19
1920
25
1921
39
1922
18
1923
32
1924
12
1925
23
1926
25
1927
19
1928
24
1929
14
1930
20
1931
21
1932
17
1933
28
1934
19
1935
21
1936
30
1937
16
1938
19
1939
15
1940
14
1941
17
1942
23
1943
20
1944
18
1945
22
1946
15
1947
35
1948
17
1949
21
1950
32
1951
18
1952
18
1953
21
1954
25
1955
10
1956
19
1957
28
1958
15
1959
16
1960
12
1961
19
1962
18
1963
18
1964
15
1965
14
1966
13
1967
25
1968
17
1969
13
1970
21
1971
11
1972
19
1973
19
1974
25
1975
17
1976
23
1977
19
1978
17
1979
34
1980
11
1981
23
1982
25
1983
13
All-Time Record Progression
2 new records
2 all-time records were set at Nappan Cda between 22 September 1942 and 4 January 1961. Each dot is a new record.
When Nappan Cda set new all-time records
Date
Kind
Detail
1942-09-22
Record daily precipitation
Record daily precipitation 153.7 mm (6.1 in)
1961-01-04
Record daily snowfall
Record daily snowfall 55.9 cm (22.0 in)
Wettest Day of Each Month
Sep: 153.7 mm (6.1 in)
The wettest day on record for each calendar month at Nappan Cda. The most was 153.7 mm (6.1 in) on 22 September 1942.
Record daily precipitation for each month at Nappan Cda
Month
Record daily precipitation (mm)
Date
Jan
100.2 mm (3.9 in)
8 January 1979
Feb
83.8 mm (3.3 in)
8 February 1953
Mar
57.7 mm (2.3 in)
3 March 1972
Apr
106.7 mm (4.2 in)
1 April 1962
May
43.7 mm (1.7 in)
10 May 1920
Jun
99.1 mm (3.9 in)
13 June 1968
Jul
104.0 mm (4.1 in)
22 July 1983
Aug
83.1 mm (3.3 in)
13 August 1948
Sep
153.7 mm (6.1 in)
22 September 1942
Oct
93.5 mm (3.7 in)
22 October 1917
Nov
72.1 mm (2.8 in)
6 November 1919
Dec
69.1 mm (2.7 in)
4 December 1967
Period of Record Coverage
1890 to 1983
Complete yearUnder 90 percent of days
72 years of record at Nappan Cda, 1890 to 1983. 2 years have data for under 90 percent of days and are left out of rankings: 1890, 1913.
Cooler than the station meanWarmer than the station mean
One stripe for each of 70 complete years at Nappan Cda, 1914 to 1983. Blue stripes are years cooler than the station's own mean of 5.4 C (41.7 F); red stripes are warmer. The coolest year was 1926, at 4.1 C (39.4 F), and the warmest was 1953, at 7.2 C (44.9 F). The strongest colour marks a difference of 1.8 C (3.2 F).
Annual mean temperature at Nappan Cda as warming stripes, 1914 to 1983
Year
Annual mean temperature
Difference from the station mean
1914
4.2 C
-1.19 C
1915
5.8 C
+0.40 C
1916
4.9 C
-0.46 C
1917
4.4 C
-1.03 C
1918
4.4 C
-1.04 C
1919
5.4 C
-0.05 C
1920
5.1 C
-0.34 C
1921
5.4 C
+0.01 C
1922
4.9 C
-0.52 C
1923
4.1 C
-1.28 C
1924
5.0 C
-0.39 C
1925
5.0 C
-0.44 C
1926
4.1 C
-1.29 C
1927
5.9 C
+0.45 C
1928
5.7 C
+0.31 C
1929
5.1 C
-0.27 C
1930
5.9 C
+0.48 C
1931
6.5 C
+1.06 C
1932
5.8 C
+0.36 C
1933
5.1 C
-0.27 C
1934
4.5 C
-0.95 C
1935
4.6 C
-0.80 C
1936
5.1 C
-0.33 C
1937
6.0 C
+0.59 C
1938
5.5 C
+0.08 C
1939
4.9 C
-0.46 C
1940
4.6 C
-0.76 C
1941
4.6 C
-0.76 C
1942
5.4 C
+0.03 C
1943
4.4 C
-0.97 C
1944
5.5 C
+0.07 C
1945
5.4 C
-0.05 C
1946
5.5 C
+0.11 C
1947
5.9 C
+0.47 C
1948
5.1 C
-0.33 C
1949
6.5 C
+1.13 C
1950
5.8 C
+0.37 C
1951
6.7 C
+1.34 C
1952
6.5 C
+1.09 C
1953
7.2 C
+1.78 C
1954
6.3 C
+0.89 C
1955
5.5 C
+0.12 C
1956
5.1 C
-0.29 C
1957
5.7 C
+0.26 C
1958
5.3 C
-0.12 C
1959
5.7 C
+0.29 C
1960
6.3 C
+0.91 C
1961
5.4 C
0.00 C
1962
4.8 C
-0.62 C
1963
5.0 C
-0.44 C
1964
5.0 C
-0.36 C
1965
4.8 C
-0.58 C
1966
6.1 C
+0.73 C
1967
4.9 C
-0.55 C
1968
5.2 C
-0.19 C
1969
6.4 C
+1.00 C
1970
5.3 C
-0.10 C
1971
5.7 C
+0.34 C
1972
4.5 C
-0.89 C
1973
6.2 C
+0.76 C
1974
5.1 C
-0.30 C
1975
5.3 C
-0.07 C
1976
5.7 C
+0.32 C
1977
5.7 C
+0.30 C
1978
4.9 C
-0.48 C
1979
6.8 C
+1.37 C
1980
5.1 C
-0.35 C
1981
6.3 C
+0.90 C
1982
5.3 C
-0.09 C
1983
6.7 C
+1.32 C
The annual mean temperature here has risen by 0.12 C (0.04 to 0.20) per decade over 1914 to 1983. In Fahrenheit: 0.2 F (0.1 to 0.4) per decade. The slope is a straight line fitted to 70 complete years; the brackets give its 95 percent interval.
Fitted temperature trends per decade at Nappan Cda
Measure
Per decade (C)
Per decade (F)
Period
Complete years
Reading
Annual mean temperature
0.12 C (0.04 to 0.20) per decade
0.2 F (0.1 to 0.4) per decade
1914 to 1983
70
Rise
Mean daily maximum
0.12 C (0.04 to 0.20) per decade
0.2 F (0.1 to 0.4) per decade
1914 to 1983
70
Rise
Mean daily minimum
0.12 C (0.03 to 0.21) per decade
0.21 F (0.05 to 0.38) per decade
1914 to 1983
70
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
1890 to 1983
Yearly extremes at Nappan Cda: the record and the median year
Measure
Record
Year of the record
Median year
Years with a value
Hottest day (TXx)
34.4 C (93.9 F)
1935
29.4 C (84.9 F)
72
Coldest night (TNn)
-37.2 C (-35.0 F)
1922
-28.3 C (-18.9 F)
72
Wettest day (Rx1day)
153.7 mm (6.1 in)
1942
49.7 mm (2.0 in)
72
Wettest five days (Rx5day)
216.0 mm (8.5 in)
1942
75.4 mm (3.0 in)
72
Longest dry spell (CDD)
26 days
1961
15 days
72
Hottest day (TXx)
The hottest day of the year at Nappan Cda, 1890 to 1983. The record is 34.4 C (93.9 F) in 1935, marked on the chart; the median year is 29.4 C (84.9 F).
Hottest day (TXx) at Nappan Cda by year
Year
Hottest day (TXx)
1890
27.8 C (82.0 F)
1913
22.2 C (72.0 F)
1914
28.9 C (84.0 F)
1915
27.2 C (81.0 F)
1916
29.4 C (84.9 F)
1917
29.4 C (84.9 F)
1918
27.2 C (81.0 F)
1919
29.4 C (84.9 F)
1920
30.6 C (87.1 F)
1921
31.7 C (89.1 F)
1922
28.3 C (82.9 F)
1923
28.3 C (82.9 F)
1924
29.4 C (84.9 F)
1925
28.9 C (84.0 F)
1926
31.1 C (88.0 F)
1927
27.8 C (82.0 F)
1928
31.7 C (89.1 F)
1929
28.9 C (84.0 F)
1930
31.1 C (88.0 F)
1931
30.0 C (86.0 F)
1932
28.9 C (84.0 F)
1933
30.6 C (87.1 F)
1934
29.4 C (84.9 F)
1935
34.4 C (93.9 F)
1936
28.9 C (84.0 F)
1937
31.1 C (88.0 F)
1938
29.4 C (84.9 F)
1939
31.7 C (89.1 F)
1940
30.0 C (86.0 F)
1941
31.7 C (89.1 F)
1942
32.2 C (90.0 F)
1943
30.0 C (86.0 F)
1944
34.4 C (93.9 F)
1945
30.6 C (87.1 F)
1946
29.4 C (84.9 F)
1947
32.8 C (91.0 F)
1948
31.7 C (89.1 F)
1949
32.2 C (90.0 F)
1950
28.3 C (82.9 F)
1951
28.9 C (84.0 F)
1952
32.2 C (90.0 F)
1953
28.9 C (84.0 F)
1954
28.3 C (82.9 F)
1955
31.1 C (88.0 F)
1956
30.6 C (87.1 F)
1957
27.8 C (82.0 F)
1958
27.8 C (82.0 F)
1959
30.0 C (86.0 F)
1960
31.7 C (89.1 F)
1961
30.0 C (86.0 F)
1962
27.8 C (82.0 F)
1963
30.0 C (86.0 F)
1964
28.3 C (82.9 F)
1965
29.4 C (84.9 F)
1966
27.8 C (82.0 F)
1967
30.6 C (87.1 F)
1968
31.1 C (88.0 F)
1969
28.9 C (84.0 F)
1970
30.0 C (86.0 F)
1971
28.9 C (84.0 F)
1972
28.9 C (84.0 F)
1973
28.9 C (84.0 F)
1974
29.4 C (84.9 F)
1975
31.7 C (89.1 F)
1976
31.7 C (89.1 F)
1977
30.0 C (86.0 F)
1978
30.0 C (86.0 F)
1979
28.5 C (83.3 F)
1980
28.0 C (82.4 F)
1981
27.0 C (80.6 F)
1982
28.5 C (83.3 F)
1983
29.5 C (85.1 F)
Coldest night (TNn)
The coldest night of the year at Nappan Cda, 1890 to 1983. The record is -37.2 C (-35.0 F) in 1922, marked on the chart; the median year is -28.3 C (-18.9 F).
Coldest night (TNn) at Nappan Cda by year
Year
Coldest night (TNn)
1890
-2.2 C (28.0 F)
1913
-17.8 C (0.0 F)
1914
-32.8 C (-27.0 F)
1915
-25.6 C (-14.1 F)
1916
-31.1 C (-24.0 F)
1917
-30.6 C (-23.1 F)
1918
-30.6 C (-23.1 F)
1919
-27.8 C (-18.0 F)
1920
-29.4 C (-20.9 F)
1921
-27.2 C (-17.0 F)
1922
-37.2 C (-35.0 F)
1923
-32.2 C (-26.0 F)
1924
-27.2 C (-17.0 F)
1925
-36.7 C (-34.1 F)
1926
-28.9 C (-20.0 F)
1927
-23.9 C (-11.0 F)
1928
-26.1 C (-15.0 F)
1929
-26.7 C (-16.1 F)
1930
-31.7 C (-25.1 F)
1931
-30.0 C (-22.0 F)
1932
-25.6 C (-14.1 F)
1933
-28.9 C (-20.0 F)
1934
-34.4 C (-29.9 F)
1935
-32.8 C (-27.0 F)
1936
-28.3 C (-18.9 F)
1937
-25.0 C (-13.0 F)
1938
-28.3 C (-18.9 F)
1939
-20.6 C (-5.1 F)
1940
-26.7 C (-16.1 F)
1941
-28.9 C (-20.0 F)
1942
-28.3 C (-18.9 F)
1943
-31.1 C (-24.0 F)
1944
-24.4 C (-11.9 F)
1945
-28.9 C (-20.0 F)
1946
-23.9 C (-11.0 F)
1947
-24.4 C (-11.9 F)
1948
-33.3 C (-27.9 F)
1949
-24.4 C (-11.9 F)
1950
-24.4 C (-11.9 F)
1951
-27.8 C (-18.0 F)
1952
-26.7 C (-16.1 F)
1953
-18.9 C (-2.0 F)
1954
-29.4 C (-20.9 F)
1955
-27.8 C (-18.0 F)
1956
-28.3 C (-18.9 F)
1957
-33.9 C (-29.0 F)
1958
-22.8 C (-9.0 F)
1959
-25.0 C (-13.0 F)
1960
-25.6 C (-14.1 F)
1961
-32.2 C (-26.0 F)
1962
-32.2 C (-26.0 F)
1963
-28.9 C (-20.0 F)
1964
-26.7 C (-16.1 F)
1965
-31.1 C (-24.0 F)
1966
-28.9 C (-20.0 F)
1967
-29.4 C (-20.9 F)
1968
-32.8 C (-27.0 F)
1969
-24.4 C (-11.9 F)
1970
-27.2 C (-17.0 F)
1971
-31.1 C (-24.0 F)
1972
-27.8 C (-18.0 F)
1973
-27.2 C (-17.0 F)
1974
-31.1 C (-24.0 F)
1975
-24.4 C (-11.9 F)
1976
-29.4 C (-20.9 F)
1977
-28.3 C (-18.9 F)
1978
-26.1 C (-15.0 F)
1979
-24.0 C (-11.2 F)
1980
-28.0 C (-18.4 F)
1981
-31.0 C (-23.8 F)
1982
-30.0 C (-22.0 F)
1983
-23.0 C (-9.4 F)
Wettest day (Rx1day)
The wettest day of the year at Nappan Cda, 1890 to 1983. The record is 153.7 mm (6.1 in) in 1942, marked on the chart; the median year is 49.7 mm (2.0 in).
Wettest day (Rx1day) at Nappan Cda by year
Year
Wettest day (Rx1day)
1890
35.6 mm (1.4 in)
1913
51.8 mm (2.0 in)
1914
41.1 mm (1.6 in)
1915
77.5 mm (3.1 in)
1916
62.2 mm (2.4 in)
1917
93.5 mm (3.7 in)
1918
48.0 mm (1.9 in)
1919
72.1 mm (2.8 in)
1920
47.0 mm (1.9 in)
1921
27.9 mm (1.1 in)
1922
64.8 mm (2.6 in)
1923
68.8 mm (2.7 in)
1924
41.4 mm (1.6 in)
1925
39.4 mm (1.6 in)
1926
37.8 mm (1.5 in)
1927
55.9 mm (2.2 in)
1928
60.5 mm (2.4 in)
1929
34.8 mm (1.4 in)
1930
41.9 mm (1.6 in)
1931
45.7 mm (1.8 in)
1932
25.1 mm (1.0 in)
1933
40.1 mm (1.6 in)
1934
56.1 mm (2.2 in)
1935
67.3 mm (2.6 in)
1936
37.3 mm (1.5 in)
1937
32.5 mm (1.3 in)
1938
61.2 mm (2.4 in)
1939
41.1 mm (1.6 in)
1940
67.3 mm (2.6 in)
1941
37.6 mm (1.5 in)
1942
153.7 mm (6.1 in)
1943
31.0 mm (1.2 in)
1944
69.9 mm (2.8 in)
1945
31.2 mm (1.2 in)
1946
38.1 mm (1.5 in)
1947
43.4 mm (1.7 in)
1948
83.1 mm (3.3 in)
1949
37.8 mm (1.5 in)
1950
53.3 mm (2.1 in)
1951
50.3 mm (2.0 in)
1952
77.5 mm (3.1 in)
1953
83.8 mm (3.3 in)
1954
36.3 mm (1.4 in)
1955
23.6 mm (0.9 in)
1956
68.8 mm (2.7 in)
1957
40.1 mm (1.6 in)
1958
51.6 mm (2.0 in)
1959
83.3 mm (3.3 in)
1960
41.7 mm (1.6 in)
1961
58.4 mm (2.3 in)
1962
106.7 mm (4.2 in)
1963
46.5 mm (1.8 in)
1964
63.2 mm (2.5 in)
1965
43.7 mm (1.7 in)
1966
31.8 mm (1.3 in)
1967
69.1 mm (2.7 in)
1968
99.1 mm (3.9 in)
1969
46.0 mm (1.8 in)
1970
74.2 mm (2.9 in)
1971
49.0 mm (1.9 in)
1972
57.7 mm (2.3 in)
1973
60.5 mm (2.4 in)
1974
36.6 mm (1.4 in)
1975
54.6 mm (2.1 in)
1976
59.2 mm (2.3 in)
1977
47.0 mm (1.9 in)
1978
94.0 mm (3.7 in)
1979
100.2 mm (3.9 in)
1980
39.2 mm (1.5 in)
1981
45.0 mm (1.8 in)
1982
49.0 mm (1.9 in)
1983
104.0 mm (4.1 in)
Wettest five days (Rx5day)
The wettest five days of the year at Nappan Cda, 1890 to 1983. The record is 216.0 mm (8.5 in) in 1942, marked on the chart; the median year is 75.4 mm (3.0 in).
Wettest five days (Rx5day) at Nappan Cda by year
Year
Wettest five days (Rx5day)
1890
54.6 mm (2.1 in)
1913
101.6 mm (4.0 in)
1914
60.4 mm (2.4 in)
1915
80.5 mm (3.2 in)
1916
62.2 mm (2.4 in)
1917
149.6 mm (5.9 in)
1918
71.9 mm (2.8 in)
1919
75.4 mm (3.0 in)
1920
78.8 mm (3.1 in)
1921
40.6 mm (1.6 in)
1922
73.9 mm (2.9 in)
1923
73.3 mm (2.9 in)
1924
74.2 mm (2.9 in)
1925
73.9 mm (2.9 in)
1926
58.4 mm (2.3 in)
1927
74.0 mm (2.9 in)
1928
80.3 mm (3.2 in)
1929
79.7 mm (3.1 in)
1930
67.3 mm (2.6 in)
1931
58.4 mm (2.3 in)
1932
55.1 mm (2.2 in)
1933
108.9 mm (4.3 in)
1934
70.3 mm (2.8 in)
1935
88.6 mm (3.5 in)
1936
57.4 mm (2.3 in)
1937
58.4 mm (2.3 in)
1938
80.0 mm (3.1 in)
1939
61.1 mm (2.4 in)
1940
95.0 mm (3.7 in)
1941
58.9 mm (2.3 in)
1942
216.0 mm (8.5 in)
1943
63.7 mm (2.5 in)
1944
85.5 mm (3.4 in)
1945
53.1 mm (2.1 in)
1946
52.9 mm (2.1 in)
1947
67.6 mm (2.7 in)
1948
86.9 mm (3.4 in)
1949
73.4 mm (2.9 in)
1950
88.2 mm (3.5 in)
1951
70.1 mm (2.8 in)
1952
78.0 mm (3.1 in)
1953
102.1 mm (4.0 in)
1954
55.8 mm (2.2 in)
1955
39.4 mm (1.6 in)
1956
128.5 mm (5.1 in)
1957
81.3 mm (3.2 in)
1958
80.3 mm (3.2 in)
1959
131.3 mm (5.2 in)
1960
64.8 mm (2.6 in)
1961
80.0 mm (3.1 in)
1962
130.8 mm (5.1 in)
1963
92.3 mm (3.6 in)
1964
83.0 mm (3.3 in)
1965
61.5 mm (2.4 in)
1966
54.4 mm (2.1 in)
1967
89.6 mm (3.5 in)
1968
119.2 mm (4.7 in)
1969
67.4 mm (2.7 in)
1970
85.9 mm (3.4 in)
1971
106.7 mm (4.2 in)
1972
95.3 mm (3.8 in)
1973
85.3 mm (3.4 in)
1974
62.2 mm (2.4 in)
1975
75.4 mm (3.0 in)
1976
68.3 mm (2.7 in)
1977
89.1 mm (3.5 in)
1978
126.5 mm (5.0 in)
1979
120.0 mm (4.7 in)
1980
53.5 mm (2.1 in)
1981
102.4 mm (4.0 in)
1982
72.1 mm (2.8 in)
1983
123.5 mm (4.9 in)
Longest dry spell (CDD)
The longest dry spell of the year at Nappan Cda, 1890 to 1983. The record is 26 days in 1961, marked on the chart; the median year is 15 days.
Longest dry spell (CDD) at Nappan Cda by year
Year
Longest dry spell (CDD)
1890
9 days
1913
14 days
1914
15 days
1915
23 days
1916
14 days
1917
14 days
1918
16 days
1919
14 days
1920
23 days
1921
20 days
1922
12 days
1923
12 days
1924
17 days
1925
14 days
1926
16 days
1927
12 days
1928
10 days
1929
19 days
1930
12 days
1931
17 days
1932
17 days
1933
14 days
1934
13 days
1935
11 days
1936
9 days
1937
17 days
1938
22 days
1939
23 days
1940
13 days
1941
10 days
1942
16 days
1943
13 days
1944
15 days
1945
11 days
1946
14 days
1947
20 days
1948
14 days
1949
13 days
1950
17 days
1951
15 days
1952
11 days
1953
21 days
1954
16 days
1955
24 days
1956
14 days
1957
11 days
1958
13 days
1959
16 days
1960
16 days
1961
26 days
1962
18 days
1963
15 days
1964
16 days
1965
26 days
1966
12 days
1967
15 days
1968
20 days
1969
12 days
1970
15 days
1971
15 days
1972
11 days
1973
10 days
1974
18 days
1975
19 days
1976
19 days
1977
8 days
1978
18 days
1979
18 days
1980
23 days
1981
12 days
1982
15 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
70 years with a frost
Across 70 years with a frost, the median last spring frost at Nappan Cda falls on 28 May and the median first autumn frost on 18 September, which leaves a median of 115 days between them.
In 1954 to 1983 the median growing season was 113 days. That is 2 days fewer than in 1914 to 1943.
Fitted over all years, the growing season changes by -0.6 days per decade at this station.
Frost dates and growing season at Nappan Cda
Measure
Median, all years
Earliest period (1914 to 1943)
Recent period (1954 to 1983)
Recent against earliest
Fitted trend
Last spring frost
28 May
30 May
28 May
2 days earlier
-0.1 days per decade
First autumn frost
18 September
19 September
16 September
3 days earlier
-0.8 days per decade
Growing days
115 days
115 days
113 days
2 days fewer
-0.6 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
70 years, 1913 to 1983
A day with at least 50.9 mm (2.0 in) of rain is expected about once in 2 years. A day with at least 142.0 mm (5.6 in) of rain is expected about once in 100 years.
Rainfall return levels at Nappan Cda: the daily rain expected about once in a given number of years
Expected about once in
A day with at least
Note
2 years
50.9 mm (2.0 in)
5 years
70.7 mm (2.8 in)
10 years
85.4 mm (3.4 in)
25 years
106.2 mm (4.2 in)
50 years
123.4 mm (4.9 in)
100 years
142.0 mm (5.6 in)
Longer than the 70 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, 70 years of values from 1913 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: 153.7 mm (6.1 in) in 1942; 106.7 mm (4.2 in) in 1962; 104.0 mm (4.1 in) in 1983.
Station Changes
No change in the annual mean temperature of this station was found against its neighbours.
Download the Data
Data for Nappan Cda standing records by year: CSV or JSON. Field meanings are on the data page.
Data for Nappan Cda 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.