Record envelope, standing records and threshold days for Armstrong (CA001160450), British Columbia, Canada, with 81 years of record.
Key Facts for Armstrong
Armstrong (CA001160450) is a weather station in British Columbia, Canada at 50.45 latitude and -119.18 longitude, 359 m (1,178 ft) above sea level.
The station reports from 1912 to 1992, 81 years of record.
1,464 records set at Armstrong still stand.
Records are tracked for tmax, tmin, prcp, snow: an element needs 30 years of data to be eligible.
Armstrong set a daily record high maximum temperature of 8.5 C (47.3 F) on 8 February 1978.
About the Station
Location: British Columbia, Canada, 50.45 latitude, -119.18 longitude.
Elevation: 359 m (1,178 ft).
Period of record: 1912 to 1992, 81 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 Armstrong. 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 Armstrong, with 2026 drawn through them
Month
Highest record high
Lowest record low
2026 highest maximum
2026 lowest minimum
Jan
10.6 C (51.1 F)
-42.2 C (-44.0 F)
n/a
n/a
Feb
15.0 C (59.0 F)
-38.9 C (-38.0 F)
n/a
n/a
Mar
21.1 C (70.0 F)
-29.4 C (-20.9 F)
n/a
n/a
Apr
31.1 C (88.0 F)
-13.3 C (8.1 F)
n/a
n/a
May
36.1 C (97.0 F)
-9.4 C (15.1 F)
n/a
n/a
Jun
38.3 C (100.9 F)
-1.7 C (28.9 F)
n/a
n/a
Jul
40.6 C (105.1 F)
0.6 C (33.1 F)
n/a
n/a
Aug
38.9 C (102.0 F)
-6.1 C (21.0 F)
n/a
n/a
Sep
34.4 C (93.9 F)
-6.7 C (19.9 F)
n/a
n/a
Oct
26.1 C (79.0 F)
-10.6 C (12.9 F)
n/a
n/a
Nov
19.4 C (66.9 F)
-23.3 C (-9.9 F)
n/a
n/a
Dec
15.6 C (60.1 F)
-38.9 C (-38.0 F)
n/a
n/a
Which Years Hold Standing Records
1,464 standing records
Year with most
1,464 records at Armstrong still stand. 1936 holds the most, with 56.
Standing records at Armstrong by the year they were set
Year set
Standing records
1913
21
1914
20
1915
11
1916
25
1917
27
1918
33
1919
43
1920
24
1921
43
1922
19
1923
17
1924
39
1925
15
1926
23
1927
21
1928
9
1929
12
1930
21
1931
10
1932
10
1933
24
1934
33
1935
28
1936
56
1937
24
1938
19
1939
28
1940
26
1941
26
1942
19
1943
32
1944
21
1945
26
1946
26
1947
23
1948
16
1949
33
1950
39
1951
27
1952
18
1953
17
1954
35
1955
38
1956
23
1957
12
1958
21
1959
18
1960
22
1961
29
1962
21
1963
15
1964
10
1965
17
1966
13
1967
23
1968
23
1969
10
1970
23
1971
22
1972
15
1973
7
1974
13
1975
14
1976
14
1977
19
1978
3
All-Time Record Progression
7 new records
7 all-time records were set at Armstrong between 21 January 1943 and 29 December 1968. Each dot is a new record.
When Armstrong set new all-time records
Date
Kind
Detail
1943-01-21
Record low minimum temperature
Record low minimum temperature -39.4 C (-38.9 F)
1950-01-16
Record low minimum temperature
Record low minimum temperature -40.0 C (-40.0 F)
1950-01-17
Record low maximum temperature
Record low maximum temperature -26.7 C (-16.1 F)
1950-01-25
Record low minimum temperature
Record low minimum temperature -42.2 C (-44.0 F)
1956-12-08
Record daily precipitation
Record daily precipitation 55.1 mm (2.2 in)
1956-12-08
Record daily snowfall
Record daily snowfall 55.1 cm (21.7 in)
1968-12-29
Record low maximum temperature
Record low maximum temperature -27.8 C (-18.0 F)
Wettest Day of Each Month
Dec: 55.1 mm (2.2 in)
The wettest day on record for each calendar month at Armstrong. The most was 55.1 mm (2.2 in) on 8 December 1956.
Record daily precipitation for each month at Armstrong
Month
Record daily precipitation (mm)
Date
Jan
39.1 mm (1.5 in)
31 January 1957
Feb
41.4 mm (1.6 in)
9 February 1951
Mar
19.3 mm (0.8 in)
18 March 1921
Apr
27.9 mm (1.1 in)
11 April 1966
May
25.9 mm (1.0 in)
17 May 1927
Jun
49.0 mm (1.9 in)
30 June 1929
Jul
41.9 mm (1.6 in)
11 July 1942
Aug
46.2 mm (1.8 in)
16 August 1961
Sep
40.1 mm (1.6 in)
20 September 1945
Oct
29.0 mm (1.1 in)
18 October 1943
Nov
26.9 mm (1.1 in)
9 November 1964
Dec
55.1 mm (2.2 in)
8 December 1956
Period of Record Coverage
1913 to 1978
Complete yearUnder 90 percent of days
66 years of record at Armstrong, 1913 to 1978. 5 years have data for under 90 percent of days and are left out of rankings: 1913, 1931, 1932, 1969, 1978.
Cooler than the station meanWarmer than the station mean
One stripe for each of 59 complete years at Armstrong, 1914 to 1977. Blue stripes are years cooler than the station's own mean of 7.0 C (44.6 F); red stripes are warmer. The coolest year was 1916, at 4.8 C (40.6 F), and the warmest was 1958, at 8.9 C (48.1 F). The strongest colour marks a difference of 2.3 C (4.1 F).
Annual mean temperature at Armstrong as warming stripes, 1914 to 1977
Year
Annual mean temperature
Difference from the station mean
1914
6.9 C
-0.04 C
1915
7.4 C
+0.42 C
1916
4.8 C
-2.21 C
1917
6.2 C
-0.82 C
1918
6.9 C
-0.03 C
1919
6.1 C
-0.84 C
1920
7.0 C
+0.03 C
1921
6.8 C
-0.22 C
1922
5.7 C
-1.30 C
1923
7.0 C
+0.06 C
1924
7.0 C
+0.07 C
1925
8.0 C
+1.04 C
1926
8.0 C
+1.07 C
1927
6.3 C
-0.65 C
1928
7.2 C
+0.25 C
1929
6.2 C
-0.74 C
1930
6.4 C
-0.54 C
1933
7.0 C
-0.02 C
1934
8.1 C
+1.16 C
1935
6.7 C
-0.28 C
1936
6.1 C
-0.92 C
1937
5.5 C
-1.49 C
1938
7.3 C
+0.36 C
1939
7.0 C
+0.03 C
1940
8.2 C
+1.25 C
1941
8.6 C
+1.60 C
1942
8.1 C
+1.17 C
1943
6.5 C
-0.46 C
1944
7.5 C
+0.49 C
1945
7.4 C
+0.42 C
1946
6.7 C
-0.31 C
1947
7.1 C
+0.16 C
1948
6.3 C
-0.69 C
1949
6.3 C
-0.69 C
1950
5.9 C
-1.06 C
1951
5.8 C
-1.18 C
1952
6.6 C
-0.39 C
1953
8.1 C
+1.12 C
1954
7.0 C
-0.02 C
1955
5.7 C
-1.30 C
1956
6.7 C
-0.24 C
1958
8.9 C
+1.95 C
1959
6.5 C
-0.45 C
1961
7.8 C
+0.84 C
1962
7.5 C
+0.53 C
1963
7.7 C
+0.75 C
1964
6.5 C
-0.45 C
1965
7.0 C
0.00 C
1966
7.4 C
+0.45 C
1967
8.5 C
+1.49 C
1968
6.9 C
-0.11 C
1970
6.9 C
-0.12 C
1971
6.6 C
-0.37 C
1972
6.3 C
-0.68 C
1973
7.5 C
+0.50 C
1974
8.1 C
+1.09 C
1975
6.6 C
-0.41 C
1976
7.4 C
+0.41 C
1977
7.6 C
+0.59 C
The fitted trend in annual mean temperature here over 1914 to 1977 is 0.10 C (-0.02 to 0.21) per decade. The interval includes zero, so the trend is not clearly different from zero. In Fahrenheit: 0.18 F (-0.03 to 0.38) per decade. The slope is a straight line fitted to 59 complete years; the brackets give its 95 percent interval.
Fitted temperature trends per decade at Armstrong
Measure
Per decade (C)
Per decade (F)
Period
Complete years
Reading
Annual mean temperature
0.10 C (-0.02 to 0.21) per decade
0.18 F (-0.03 to 0.38) per decade
1914 to 1977
59
Not clearly different from zero
Mean daily maximum
0.13 C (0.01 to 0.25) per decade
0.23 F (0.02 to 0.45) per decade
1914 to 1977
59
Rise
Mean daily minimum
0.1 C (-0.1 to 0.2) per decade
0.1 F (-0.1 to 0.4) per decade
1914 to 1977
59
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
1912 to 1978
Yearly extremes at Armstrong: the record and the median year
Measure
Record
Year of the record
Median year
Years with a value
Hottest day (TXx)
40.6 C (105.1 F)
1940
36.7 C (98.1 F)
66
Coldest night (TNn)
-42.2 C (-44.0 F)
1950
-27.2 C (-17.0 F)
66
Wettest day (Rx1day)
55.1 mm (2.2 in)
1956
24.4 mm (1.0 in)
67
Wettest five days (Rx5day)
73.5 mm (2.9 in)
1942
40.1 mm (1.6 in)
67
Longest dry spell (CDD)
46 days
1946
26 days
67
Hottest day (TXx)
The hottest day of the year at Armstrong, 1912 to 1978. The record is 40.6 C (105.1 F) in 1940, marked on the chart; the median year is 36.7 C (98.1 F).
Hottest day (TXx) at Armstrong by year
Year
Hottest day (TXx)
1912
n/a
1913
32.8 C (91.0 F)
1914
35.0 C (95.0 F)
1915
32.2 C (90.0 F)
1916
32.8 C (91.0 F)
1917
34.4 C (93.9 F)
1918
35.6 C (96.1 F)
1919
38.3 C (100.9 F)
1920
36.7 C (98.1 F)
1921
34.4 C (93.9 F)
1922
36.1 C (97.0 F)
1923
32.8 C (91.0 F)
1924
37.2 C (99.0 F)
1925
35.6 C (96.1 F)
1926
39.4 C (102.9 F)
1927
37.2 C (99.0 F)
1928
35.6 C (96.1 F)
1929
37.8 C (100.0 F)
1930
37.8 C (100.0 F)
1931
36.7 C (98.1 F)
1932
32.2 C (90.0 F)
1933
33.9 C (93.0 F)
1934
37.8 C (100.0 F)
1935
36.1 C (97.0 F)
1936
38.9 C (102.0 F)
1937
35.6 C (96.1 F)
1938
38.9 C (102.0 F)
1939
37.8 C (100.0 F)
1940
40.6 C (105.1 F)
1941
40.6 C (105.1 F)
1942
38.9 C (102.0 F)
1943
36.1 C (97.0 F)
1944
39.4 C (102.9 F)
1945
37.2 C (99.0 F)
1946
37.2 C (99.0 F)
1947
35.0 C (95.0 F)
1948
37.8 C (100.0 F)
1949
37.2 C (99.0 F)
1950
36.7 C (98.1 F)
1951
36.1 C (97.0 F)
1952
37.2 C (99.0 F)
1953
36.7 C (98.1 F)
1954
32.8 C (91.0 F)
1955
37.2 C (99.0 F)
1956
37.2 C (99.0 F)
1957
33.3 C (91.9 F)
1958
37.2 C (99.0 F)
1959
37.2 C (99.0 F)
1960
39.4 C (102.9 F)
1961
38.3 C (100.9 F)
1962
35.6 C (96.1 F)
1963
35.6 C (96.1 F)
1964
35.0 C (95.0 F)
1965
36.7 C (98.1 F)
1966
34.4 C (93.9 F)
1967
38.3 C (100.9 F)
1968
36.1 C (97.0 F)
1969
35.0 C (95.0 F)
1970
36.1 C (97.0 F)
1971
38.9 C (102.0 F)
1972
35.6 C (96.1 F)
1973
37.2 C (99.0 F)
1974
36.1 C (97.0 F)
1975
38.9 C (102.0 F)
1976
34.4 C (93.9 F)
1977
36.7 C (98.1 F)
1978
9.0 C (48.2 F)
Coldest night (TNn)
The coldest night of the year at Armstrong, 1912 to 1978. The record is -42.2 C (-44.0 F) in 1950, marked on the chart; the median year is -27.2 C (-17.0 F).
Coldest night (TNn) at Armstrong by year
Year
Coldest night (TNn)
1912
n/a
1913
-20.0 C (-4.0 F)
1914
-22.8 C (-9.0 F)
1915
-23.9 C (-11.0 F)
1916
-36.1 C (-33.0 F)
1917
-32.8 C (-27.0 F)
1918
-30.6 C (-23.1 F)
1919
-32.2 C (-26.0 F)
1920
-23.9 C (-11.0 F)
1921
-26.7 C (-16.1 F)
1922
-28.9 C (-20.0 F)
1923
-27.2 C (-17.0 F)
1924
-32.2 C (-26.0 F)
1925
-20.6 C (-5.1 F)
1926
-20.0 C (-4.0 F)
1927
-32.2 C (-26.0 F)
1928
-26.1 C (-15.0 F)
1929
-32.2 C (-26.0 F)
1930
-30.0 C (-22.0 F)
1931
-12.2 C (10.0 F)
1932
-17.2 C (1.0 F)
1933
-31.1 C (-24.0 F)
1934
-20.6 C (-5.1 F)
1935
-38.9 C (-38.0 F)
1936
-38.9 C (-38.0 F)
1937
-36.7 C (-34.1 F)
1938
-25.6 C (-14.1 F)
1939
-29.4 C (-20.9 F)
1940
-22.2 C (-8.0 F)
1941
-20.0 C (-4.0 F)
1942
-20.6 C (-5.1 F)
1943
-39.4 C (-38.9 F)
1944
-24.4 C (-11.9 F)
1945
-20.6 C (-5.1 F)
1946
-23.3 C (-9.9 F)
1947
-26.7 C (-16.1 F)
1948
-27.2 C (-17.0 F)
1949
-32.8 C (-27.0 F)
1950
-42.2 C (-44.0 F)
1951
-38.9 C (-38.0 F)
1952
-35.0 C (-31.0 F)
1953
-15.0 C (5.0 F)
1954
-35.0 C (-31.0 F)
1955
-29.4 C (-20.9 F)
1956
-32.8 C (-27.0 F)
1957
-35.0 C (-31.0 F)
1958
-20.0 C (-4.0 F)
1959
-28.3 C (-18.9 F)
1960
-24.4 C (-11.9 F)
1961
-17.2 C (1.0 F)
1962
-28.9 C (-20.0 F)
1963
-28.3 C (-18.9 F)
1964
-27.2 C (-17.0 F)
1965
-21.1 C (-6.0 F)
1966
-19.4 C (-2.9 F)
1967
-21.1 C (-6.0 F)
1968
-38.3 C (-36.9 F)
1969
-38.3 C (-36.9 F)
1970
-27.2 C (-17.0 F)
1971
-35.6 C (-32.1 F)
1972
-33.3 C (-27.9 F)
1973
-26.7 C (-16.1 F)
1974
-23.3 C (-9.9 F)
1975
-25.0 C (-13.0 F)
1976
-20.6 C (-5.1 F)
1977
-22.2 C (-8.0 F)
1978
-19.0 C (-2.2 F)
Wettest day (Rx1day)
The wettest day of the year at Armstrong, 1912 to 1978. The record is 55.1 mm (2.2 in) in 1956, marked on the chart; the median year is 24.4 mm (1.0 in).
Wettest day (Rx1day) at Armstrong by year
Year
Wettest day (Rx1day)
1912
23.6 mm (0.9 in)
1913
25.7 mm (1.0 in)
1914
19.1 mm (0.8 in)
1915
16.0 mm (0.6 in)
1916
27.4 mm (1.1 in)
1917
20.8 mm (0.8 in)
1918
21.6 mm (0.9 in)
1919
12.7 mm (0.5 in)
1920
25.9 mm (1.0 in)
1921
24.1 mm (0.9 in)
1922
17.8 mm (0.7 in)
1923
24.1 mm (0.9 in)
1924
43.2 mm (1.7 in)
1925
24.4 mm (1.0 in)
1926
33.0 mm (1.3 in)
1927
25.9 mm (1.0 in)
1928
29.2 mm (1.1 in)
1929
49.0 mm (1.9 in)
1930
27.4 mm (1.1 in)
1931
29.7 mm (1.2 in)
1932
18.0 mm (0.7 in)
1933
24.1 mm (0.9 in)
1934
15.7 mm (0.6 in)
1935
32.0 mm (1.3 in)
1936
47.0 mm (1.9 in)
1937
27.9 mm (1.1 in)
1938
38.1 mm (1.5 in)
1939
18.0 mm (0.7 in)
1940
29.2 mm (1.1 in)
1941
18.5 mm (0.7 in)
1942
41.9 mm (1.6 in)
1943
36.8 mm (1.4 in)
1944
19.8 mm (0.8 in)
1945
40.1 mm (1.6 in)
1946
21.8 mm (0.9 in)
1947
21.3 mm (0.8 in)
1948
31.0 mm (1.2 in)
1949
18.5 mm (0.7 in)
1950
21.6 mm (0.9 in)
1951
41.4 mm (1.6 in)
1952
19.6 mm (0.8 in)
1953
27.9 mm (1.1 in)
1954
30.5 mm (1.2 in)
1955
19.6 mm (0.8 in)
1956
55.1 mm (2.2 in)
1957
39.1 mm (1.5 in)
1958
19.8 mm (0.8 in)
1959
29.0 mm (1.1 in)
1960
21.3 mm (0.8 in)
1961
46.2 mm (1.8 in)
1962
16.0 mm (0.6 in)
1963
13.5 mm (0.5 in)
1964
29.7 mm (1.2 in)
1965
26.4 mm (1.0 in)
1966
27.9 mm (1.1 in)
1967
25.4 mm (1.0 in)
1968
25.4 mm (1.0 in)
1969
16.5 mm (0.6 in)
1970
15.2 mm (0.6 in)
1971
27.4 mm (1.1 in)
1972
21.6 mm (0.9 in)
1973
27.9 mm (1.1 in)
1974
20.8 mm (0.8 in)
1975
17.3 mm (0.7 in)
1976
20.8 mm (0.8 in)
1977
22.4 mm (0.9 in)
1978
21.2 mm (0.8 in)
Wettest five days (Rx5day)
The wettest five days of the year at Armstrong, 1912 to 1978. The record is 73.5 mm (2.9 in) in 1942, marked on the chart; the median year is 40.1 mm (1.6 in).
Wettest five days (Rx5day) at Armstrong by year
Year
Wettest five days (Rx5day)
1912
40.1 mm (1.6 in)
1913
46.3 mm (1.8 in)
1914
28.6 mm (1.1 in)
1915
34.5 mm (1.4 in)
1916
35.3 mm (1.4 in)
1917
35.3 mm (1.4 in)
1918
31.0 mm (1.2 in)
1919
28.5 mm (1.1 in)
1920
61.3 mm (2.4 in)
1921
31.2 mm (1.2 in)
1922
29.7 mm (1.2 in)
1923
45.1 mm (1.8 in)
1924
45.7 mm (1.8 in)
1925
44.5 mm (1.8 in)
1926
36.8 mm (1.4 in)
1927
35.6 mm (1.4 in)
1928
34.8 mm (1.4 in)
1929
65.9 mm (2.6 in)
1930
45.7 mm (1.8 in)
1931
48.2 mm (1.9 in)
1932
30.0 mm (1.2 in)
1933
50.1 mm (2.0 in)
1934
42.1 mm (1.7 in)
1935
63.6 mm (2.5 in)
1936
59.7 mm (2.4 in)
1937
55.1 mm (2.2 in)
1938
57.4 mm (2.3 in)
1939
27.1 mm (1.1 in)
1940
29.2 mm (1.1 in)
1941
40.5 mm (1.6 in)
1942
73.5 mm (2.9 in)
1943
42.7 mm (1.7 in)
1944
22.6 mm (0.9 in)
1945
45.5 mm (1.8 in)
1946
36.8 mm (1.4 in)
1947
33.0 mm (1.3 in)
1948
31.8 mm (1.3 in)
1949
39.4 mm (1.6 in)
1950
30.7 mm (1.2 in)
1951
71.1 mm (2.8 in)
1952
29.2 mm (1.1 in)
1953
32.5 mm (1.3 in)
1954
47.0 mm (1.9 in)
1955
42.7 mm (1.7 in)
1956
64.8 mm (2.6 in)
1957
58.4 mm (2.3 in)
1958
34.9 mm (1.4 in)
1959
37.2 mm (1.5 in)
1960
40.3 mm (1.6 in)
1961
54.8 mm (2.2 in)
1962
35.9 mm (1.4 in)
1963
29.3 mm (1.2 in)
1964
55.1 mm (2.2 in)
1965
36.8 mm (1.4 in)
1966
47.6 mm (1.9 in)
1967
38.9 mm (1.5 in)
1968
50.3 mm (2.0 in)
1969
37.1 mm (1.5 in)
1970
36.0 mm (1.4 in)
1971
62.9 mm (2.5 in)
1972
43.9 mm (1.7 in)
1973
41.4 mm (1.6 in)
1974
33.0 mm (1.3 in)
1975
43.0 mm (1.7 in)
1976
41.9 mm (1.6 in)
1977
31.2 mm (1.2 in)
1978
32.6 mm (1.3 in)
Longest dry spell (CDD)
The longest dry spell of the year at Armstrong, 1912 to 1978. The record is 46 days in 1946, marked on the chart; the median year is 26 days.
Longest dry spell (CDD) at Armstrong by year
Year
Longest dry spell (CDD)
1912
31 days
1913
26 days
1914
21 days
1915
20 days
1916
28 days
1917
28 days
1918
20 days
1919
25 days
1920
20 days
1921
25 days
1922
29 days
1923
22 days
1924
35 days
1925
29 days
1926
16 days
1927
28 days
1928
26 days
1929
45 days
1930
30 days
1931
23 days
1932
18 days
1933
25 days
1934
31 days
1935
24 days
1936
31 days
1937
28 days
1938
38 days
1939
42 days
1940
44 days
1941
16 days
1942
24 days
1943
37 days
1944
26 days
1945
43 days
1946
46 days
1947
37 days
1948
21 days
1949
22 days
1950
32 days
1951
35 days
1952
30 days
1953
22 days
1954
26 days
1955
23 days
1956
28 days
1957
27 days
1958
24 days
1959
23 days
1960
30 days
1961
18 days
1962
17 days
1963
25 days
1964
18 days
1965
21 days
1966
25 days
1967
28 days
1968
25 days
1969
27 days
1970
22 days
1971
27 days
1972
27 days
1973
25 days
1974
36 days
1975
22 days
1976
19 days
1977
20 days
1978
16 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
59 years with a frost
Across 59 years with a frost, the median last spring frost at Armstrong falls on 22 May and the median first autumn frost on 18 September, which leaves a median of 120 days between them.
Fitted over all years, the growing season changes by +2.0 days per decade at this station.
Frost dates and growing season at Armstrong
Measure
Median, all years
Earliest period
Recent period (1945 to 1977)
Recent against earliest
Fitted trend
Last spring frost
22 May
n/a
18 May
n/a
-0.9 days per decade
First autumn frost
18 September
n/a
16 September
n/a
+1.2 days per decade
Growing days
120 days
n/a
120 days
n/a
+2.0 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
62 years, 1912 to 1977
A day with at least 24.6 mm (1.0 in) of rain is expected about once in 2 years. A day with at least 60.4 mm (2.4 in) of rain is expected about once in 100 years.
Rainfall return levels at Armstrong: the daily rain expected about once in a given number of years
Expected about once in
A day with at least
Note
2 years
24.6 mm (1.0 in)
5 years
32.8 mm (1.3 in)
10 years
38.7 mm (1.5 in)
25 years
46.9 mm (1.8 in)
50 years
53.5 mm (2.1 in)
100 years
60.4 mm (2.4 in)
Longer than the 62 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, 62 years of values from 1912 to 1977.
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: 55.1 mm (2.2 in) in 1956; 49.0 mm (1.9 in) in 1929; 47.0 mm (1.9 in) in 1936.
Station Changes
No change in the annual mean temperature of this station was found against its neighbours.
Download the Data
Data for Armstrong standing records by year: CSV or JSON. Field meanings are on the data page.
Data for Armstrong 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 2026-10-17 (17 October 2026). Records are computed by this site and are not official.