Armstrong Weather Records (CA001160450)

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

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

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

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.

Days with data per year at Armstrong
Year	Days with data	Share of year	Complete
1913	306	84%	No
1914	365	100%	Yes
1915	364	100%	Yes
1916	366	100%	Yes
1917	364	100%	Yes
1918	365	100%	Yes
1919	365	100%	Yes
1920	366	100%	Yes
1921	365	100%	Yes
1922	365	100%	Yes
1923	365	100%	Yes
1924	366	100%	Yes
1925	363	99%	Yes
1926	365	100%	Yes
1927	365	100%	Yes
1928	366	100%	Yes
1929	365	100%	Yes
1930	365	100%	Yes
1931	304	83%	No
1932	275	75%	No
1933	365	100%	Yes
1934	365	100%	Yes
1935	365	100%	Yes
1936	366	100%	Yes
1937	365	100%	Yes
1938	364	100%	Yes
1939	364	100%	Yes
1940	366	100%	Yes
1941	365	100%	Yes
1942	365	100%	Yes
1943	365	100%	Yes
1944	366	100%	Yes
1945	365	100%	Yes
1946	365	100%	Yes
1947	365	100%	Yes
1948	366	100%	Yes
1949	364	100%	Yes
1950	364	100%	Yes
1951	365	100%	Yes
1952	366	100%	Yes
1953	364	100%	Yes
1954	361	99%	Yes
1955	364	100%	Yes
1956	366	100%	Yes
1957	334	92%	Yes
1958	365	100%	Yes
1959	365	100%	Yes
1960	357	98%	Yes
1961	364	100%	Yes
1962	365	100%	Yes
1963	365	100%	Yes
1964	364	99%	Yes
1965	365	100%	Yes
1966	365	100%	Yes
1967	365	100%	Yes
1968	366	100%	Yes
1969	240	66%	No
1970	359	98%	Yes
1971	363	99%	Yes
1972	357	98%	Yes
1973	365	100%	Yes
1974	365	100%	Yes
1975	365	100%	Yes
1976	366	100%	Yes
1977	365	100%	Yes
1978	59	16%	No

Latest Records

Latest records at Armstrong
Date	Station	Record	Value	Beat old record by	Old record stood	Significance
8 February 1978	Armstrong, CA	daily high max	8.5 C (47.3 F)	1.3 C (2.3 F)	36 years	18 of 100 (Routine)
22 January 1978	Armstrong, CA	daily high max	5.5 C (41.9 F)	1.1 C (2.0 F)	24 years	14 of 100 (Routine)
22 January 1978	Armstrong, CA	daily high min	-0.5 C (31.1 F)	0.6 C (1.1 F)	22 years	12 of 100 (Routine)
3 January 1978	Armstrong, CA	daily rain	21.2 mm (0.8 in)	3.4 mm (0.13 in)	50 years	20 of 100 (Routine)
3 January 1978	Armstrong, CA	daily snowfall	21.2 cm (8.3 in)	3.4 cm (1.3 in)	50 years	28 of 100 (Routine)
9 December 1977	Armstrong, CA	daily low max	-13.9 C (7.0 F)	1.7 C (3.1 F)	58 years	26 of 100 (Routine)
8 December 1977	Armstrong, CA	daily low max	-13.9 C (7.0 F)	1.7 C (3.1 F)	44 years	22 of 100 (Routine)
5 December 1977	Armstrong, CA	daily snowfall	13.7 cm (5.4 in)	3.5 cm (1.4 in)	60 years	29 of 100 (Routine)
5 December 1977	Armstrong, CA	daily rain	13.7 mm (0.5 in)	2.8 mm (0.11 in)	52 years	20 of 100 (Routine)
29 November 1977	Armstrong, CA	daily high max	10.6 C (51.1 F)	2.3 C (4.1 F)	56 years	28 of 100 (Routine)
25 November 1977	Armstrong, CA	monthly snowfall	21.6 cm (8.5 in)	1.3 cm (0.5 in)	40 years	30 of 100 (Routine)
25 November 1977	Armstrong, CA	daily rain	21.6 mm (0.9 in)	5.3 mm (0.21 in)	2 years	19 of 100 (Routine)
24 November 1977	Armstrong, CA	daily low max	-3.3 C (26.1 F)	0.5 C (0.9 F)	4 years	8 of 100 (Routine)
23 November 1977	Armstrong, CA	daily low max	-7.2 C (19.0 F)	2.2 C (4.0 F)	4 years	12 of 100 (Routine)
22 November 1977	Armstrong, CA	daily low min	-18.3 C (-0.9 F)	1.6 C (2.9 F)	31 years	18 of 100 (Routine)
1 November 1977	Armstrong, CA	daily snowfall	1.0 cm (0.4 in)	0.7 cm (0.3 in)	4 years	8 of 100 (Routine)
25 October 1977	Armstrong, CA	daily high max (Tie)	16.7 C (62.1 F)	tie	22 years	3 of 100 (Routine)
23 October 1977	Armstrong, CA	daily high max (Tie)	18.3 C (64.9 F)	tie	38 years	4 of 100 (Routine)
22 August 1977	Armstrong, CA	daily high min	15.6 C (60.1 F)	0.6 C (1.1 F)	12 years	10 of 100 (Routine)
13 August 1977	Armstrong, CA	daily high min (Tie)	15.0 C (59.0 F)	tie	14 years	2 of 100 (Routine)

Climate Trend

59 complete years, 1914 to 1977

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.

Data as of 2026-10-17. Last revised 17 October 2026 (2026-10-17).