Aiyansh Weather Records (CA001070150)

Record envelope, standing records and threshold days for Aiyansh (CA001070150), British Columbia, Canada, with 48 years of record.

Key Facts for Aiyansh

Aiyansh (CA001070150) is a weather station in British Columbia, Canada at 55.23 latitude and -129.02 longitude, 229 m (751 ft) above sea level.
The station reports from 1924 to 1971, 48 years of record.
1,460 records set at Aiyansh still stand.
Records are tracked for prcp, snow: an element needs 30 years of data to be eligible.
Aiyansh set a daily record precipitation of 17.3 mm (0.7 in) on 17 August 1971.

About the Station

Location: British Columbia, Canada, 55.23 latitude, -129.02 longitude.
Elevation: 229 m (751 ft).
Period of record: 1924 to 1971, 48 years.
Eligible elements: 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 Aiyansh. 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 Aiyansh, with 2026 drawn through them
Month	Highest record high	Lowest record low	2026 highest maximum	2026 lowest minimum
Jan	7.8 C (46.0 F)	-23.9 C (-11.0 F)	n/a	n/a
Feb	7.8 C (46.0 F)	-23.3 C (-9.9 F)	n/a	n/a
Mar	8.9 C (48.0 F)	-10.6 C (12.9 F)	n/a	n/a
Apr	22.2 C (72.0 F)	-3.3 C (26.1 F)	n/a	n/a
May	25.0 C (77.0 F)	-3.3 C (26.1 F)	n/a	n/a
Jun	25.0 C (77.0 F)	2.2 C (36.0 F)	n/a	n/a
Jul	34.4 C (93.9 F)	6.1 C (43.0 F)	n/a	n/a
Aug	26.7 C (80.1 F)	3.9 C (39.0 F)	n/a	n/a
Sep	21.1 C (70.0 F)	-1.1 C (30.0 F)	n/a	n/a
Oct	18.3 C (64.9 F)	-2.8 C (27.0 F)	n/a	n/a
Nov	11.1 C (52.0 F)	-16.7 C (1.9 F)	n/a	n/a
Dec	3.3 C (37.9 F)	-23.9 C (-11.0 F)	n/a	n/a

Which Years Hold Standing Records

1,460 standing records

1,460 records at Aiyansh still stand. 1971 holds the most, with 1,030.

Wettest Day of Each Month

Dec: 94.0 mm (3.7 in)

The wettest day on record for each calendar month at Aiyansh. The most was 94.0 mm (3.7 in) on 24 December 1947.

Record daily precipitation for each month at Aiyansh
Month	Record daily precipitation (mm)	Date
Jan	90.9 mm (3.6 in)	27 January 1962
Feb	77.2 mm (3.0 in)	25 February 1926
Mar	40.6 mm (1.6 in)	7 March 1934
Apr	48.3 mm (1.9 in)	11 April 1947
May	36.3 mm (1.4 in)	9 May 1965
Jun	29.0 mm (1.1 in)	10 June 1931
Jul	36.3 mm (1.4 in)	9 July 1968
Aug	55.6 mm (2.2 in)	19 August 1962
Sep	65.0 mm (2.6 in)	23 September 1967
Oct	89.4 mm (3.5 in)	26 October 1951
Nov	74.4 mm (2.9 in)	2 November 1956
Dec	94.0 mm (3.7 in)	24 December 1947

Period of Record Coverage

1970 to 1971

2 years of record at Aiyansh, 1970 to 1971. 2 years have data for under 90 percent of days and are left out of rankings: 1970, 1971.

Latest Records

Latest records at Aiyansh
Date	Station	Record	Value	Beat old record by	Old record stood	Significance
17 August 1971	Aiyansh, CA	daily rain	17.3 mm (0.7 in)	4.9 mm (0.19 in)	16 years	17 of 100 (Routine)
1 August 1971	Aiyansh, CA	daily rain	23.9 mm (0.9 in)	11.5 mm (0.5 in)	1 year	20 of 100 (Routine)
22 June 1971	Aiyansh, CA	daily rain	21.1 mm (0.8 in)	6.6 mm (0.26 in)	29 years	20 of 100 (Routine)
18 June 1971	Aiyansh, CA	daily rain	10.2 mm (0.4 in)	1.1 mm (0.04 in)	28 years	14 of 100 (Routine)
14 April 1971	Aiyansh, CA	daily snowfall	7.6 cm (3.0 in)	6.3 cm (2.5 in)	16 years	21 of 100 (Routine)
23 March 1971	Aiyansh, CA	daily snowfall	20.8 cm (8.2 in)	11.9 cm (4.7 in)	17 years	25 of 100 (Routine)
19 March 1971	Aiyansh, CA	daily snowfall	15.0 cm (5.9 in)	6.1 cm (2.4 in)	22 years	18 of 100 (Routine)
1 March 1971	Aiyansh, CA	daily snowfall	6.1 cm (2.4 in)	4.1 cm (1.6 in)	30 years	18 of 100 (Routine)
11 February 1971	Aiyansh, CA	daily rain	23.4 mm (0.9 in)	0.5 mm (0.02 in)	24 years	11 of 100 (Routine)
25 September 1970	Aiyansh, CA	daily rain	34.3 mm (1.4 in)	13.7 mm (0.5 in)	3 years	21 of 100 (Routine)
25 July 1970	Aiyansh, CA	daily rain	10.2 mm (0.4 in)	2.6 mm (0.10 in)	40 years	20 of 100 (Routine)
18 July 1970	Aiyansh, CA	daily rain	14.0 mm (0.6 in)	0.3 mm (0.01 in)	4 years	5 of 100 (Routine)
3 July 1970	Aiyansh, CA	daily rain	15.2 mm (0.6 in)	1.7 mm (0.07 in)	20 years	13 of 100 (Routine)
23 June 1970	Aiyansh, CA	daily rain	16.5 mm (0.6 in)	4.3 mm (0.17 in)	36 years	20 of 100 (Routine)
31 May 1970	Aiyansh, CA	daily rain	6.4 mm (0.25 in)	0.3 mm (0.01 in)	21 years	10 of 100 (Routine)
30 May 1970	Aiyansh, CA	daily rain	16.0 mm (0.6 in)	7.1 mm (0.28 in)	7 years	20 of 100 (Routine)
26 November 1969	Aiyansh, CA	daily rain	22.4 mm (0.9 in)	3.9 mm (0.15 in)	32 years	17 of 100 (Routine)
13 November 1969	Aiyansh, CA	daily rain	44.5 mm (1.8 in)	18.1 mm (0.7 in)	40 years	35 of 100 (Notable)
16 August 1969	Aiyansh, CA	daily rain	26.7 mm (1.1 in)	11.7 mm (0.5 in)	20 years	30 of 100 (Routine)
14 August 1969	Aiyansh, CA	daily rain	21.8 mm (0.9 in)	9.6 mm (0.38 in)	18 years	20 of 100 (Routine)

Extremes by Year

1924 to 1971

Yearly extremes at Aiyansh: 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)	1971	26.9 C (80.4 F)	2
Coldest night (TNn)	-23.9 C (-11.0 F)	1970	-23.9 C (-11.0 F)	2
Wettest day (Rx1day)	94.0 mm (3.7 in)	1947	47.5 mm (1.9 in)	47
Wettest five days (Rx5day)	205.0 mm (8.1 in)	1962	95.3 mm (3.8 in)	47
Longest dry spell (CDD)	30 days	1963	18 days	47

Hottest day (TXx)

The hottest day of the year at Aiyansh, 1924 to 1971. The record is 34.4 C (93.9 F) in 1971, marked on the chart; the median year is 26.9 C (80.4 F).

Hottest day (TXx) at Aiyansh by year
Year	Hottest day (TXx)
1924	n/a
1925	n/a
1926	n/a
1927	n/a
1928	n/a
1929	n/a
1930	n/a
1931	n/a
1932	n/a
1933	n/a
1934	n/a
1935	n/a
1936	n/a
1937	n/a
1938	n/a
1939	n/a
1940	n/a
1941	n/a
1942	n/a
1943	n/a
1944	n/a
1945	n/a
1946	n/a
1947	n/a
1948	n/a
1949	n/a
1950	n/a
1951	n/a
1952	n/a
1953	n/a
1954	n/a
1955	n/a
1956	n/a
1957	n/a
1958	n/a
1960	n/a
1961	n/a
1962	n/a
1963	n/a
1964	n/a
1965	n/a
1966	n/a
1967	n/a
1968	n/a
1969	n/a
1970	19.4 C (66.9 F)
1971	34.4 C (93.9 F)

Coldest night (TNn)

The coldest night of the year at Aiyansh, 1924 to 1971. The record is -23.9 C (-11.0 F) in 1970, marked on the chart; the median year is -23.9 C (-11.0 F).

Coldest night (TNn) at Aiyansh by year
Year	Coldest night (TNn)
1924	n/a
1925	n/a
1926	n/a
1927	n/a
1928	n/a
1929	n/a
1930	n/a
1931	n/a
1932	n/a
1933	n/a
1934	n/a
1935	n/a
1936	n/a
1937	n/a
1938	n/a
1939	n/a
1940	n/a
1941	n/a
1942	n/a
1943	n/a
1944	n/a
1945	n/a
1946	n/a
1947	n/a
1948	n/a
1949	n/a
1950	n/a
1951	n/a
1952	n/a
1953	n/a
1954	n/a
1955	n/a
1956	n/a
1957	n/a
1958	n/a
1960	n/a
1961	n/a
1962	n/a
1963	n/a
1964	n/a
1965	n/a
1966	n/a
1967	n/a
1968	n/a
1969	n/a
1970	-23.9 C (-11.0 F)
1971	-23.9 C (-11.0 F)

Wettest day (Rx1day)

The wettest day of the year at Aiyansh, 1924 to 1971. The record is 94.0 mm (3.7 in) in 1947, marked on the chart; the median year is 47.5 mm (1.9 in).

Wettest day (Rx1day) at Aiyansh by year
Year	Wettest day (Rx1day)
1924	40.6 mm (1.6 in)
1925	45.7 mm (1.8 in)
1926	77.2 mm (3.0 in)
1927	41.4 mm (1.6 in)
1928	30.2 mm (1.2 in)
1929	61.2 mm (2.4 in)
1930	33.0 mm (1.3 in)
1931	47.5 mm (1.9 in)
1932	55.1 mm (2.2 in)
1933	66.3 mm (2.6 in)
1934	53.3 mm (2.1 in)
1935	58.4 mm (2.3 in)
1936	46.7 mm (1.8 in)
1937	35.6 mm (1.4 in)
1938	35.3 mm (1.4 in)
1939	61.0 mm (2.4 in)
1940	29.7 mm (1.2 in)
1941	50.5 mm (2.0 in)
1942	31.2 mm (1.2 in)
1943	48.5 mm (1.9 in)
1944	15.2 mm (0.6 in)
1945	67.6 mm (2.7 in)
1946	49.5 mm (1.9 in)
1947	94.0 mm (3.7 in)
1948	52.8 mm (2.1 in)
1949	36.8 mm (1.4 in)
1950	38.9 mm (1.5 in)
1951	89.4 mm (3.5 in)
1952	38.1 mm (1.5 in)
1953	43.2 mm (1.7 in)
1954	42.9 mm (1.7 in)
1955	34.3 mm (1.4 in)
1956	74.4 mm (2.9 in)
1957	67.6 mm (2.7 in)
1958	26.9 mm (1.1 in)
1960	50.8 mm (2.0 in)
1961	53.3 mm (2.1 in)
1962	90.9 mm (3.6 in)
1963	44.5 mm (1.8 in)
1964	59.2 mm (2.3 in)
1965	60.7 mm (2.4 in)
1966	71.6 mm (2.8 in)
1967	65.0 mm (2.6 in)
1968	36.3 mm (1.4 in)
1969	44.5 mm (1.8 in)
1970	34.3 mm (1.4 in)
1971	25.7 mm (1.0 in)

Wettest five days (Rx5day)

The wettest five days of the year at Aiyansh, 1924 to 1971. The record is 205.0 mm (8.1 in) in 1962, marked on the chart; the median year is 95.3 mm (3.8 in).

Wettest five days (Rx5day) at Aiyansh by year
Year	Wettest five days (Rx5day)
1924	69.8 mm (2.7 in)
1925	166.9 mm (6.6 in)
1926	138.4 mm (5.4 in)
1927	86.7 mm (3.4 in)
1928	82.5 mm (3.2 in)
1929	106.4 mm (4.2 in)
1930	70.9 mm (2.8 in)
1931	110.7 mm (4.4 in)
1932	115.1 mm (4.5 in)
1933	172.2 mm (6.8 in)
1934	130.2 mm (5.1 in)
1935	166.6 mm (6.6 in)
1936	92.0 mm (3.6 in)
1937	70.7 mm (2.8 in)
1938	65.5 mm (2.6 in)
1939	95.3 mm (3.8 in)
1940	77.4 mm (3.0 in)
1941	85.3 mm (3.4 in)
1942	60.2 mm (2.4 in)
1943	84.9 mm (3.3 in)
1944	34.4 mm (1.4 in)
1945	89.9 mm (3.5 in)
1946	116.9 mm (4.6 in)
1947	154.0 mm (6.1 in)
1948	81.4 mm (3.2 in)
1949	113.0 mm (4.4 in)
1950	73.7 mm (2.9 in)
1951	137.1 mm (5.4 in)
1952	91.5 mm (3.6 in)
1953	119.4 mm (4.7 in)
1954	101.3 mm (4.0 in)
1955	83.3 mm (3.3 in)
1956	129.5 mm (5.1 in)
1957	143.7 mm (5.7 in)
1958	62.5 mm (2.5 in)
1960	71.9 mm (2.8 in)
1961	100.1 mm (3.9 in)
1962	205.0 mm (8.1 in)
1963	102.7 mm (4.0 in)
1964	133.9 mm (5.3 in)
1965	112.6 mm (4.4 in)
1966	111.7 mm (4.4 in)
1967	146.3 mm (5.8 in)
1968	62.3 mm (2.5 in)
1969	81.8 mm (3.2 in)
1970	68.1 mm (2.7 in)
1971	52.1 mm (2.1 in)

Longest dry spell (CDD)

The longest dry spell of the year at Aiyansh, 1924 to 1971. The record is 30 days in 1963, marked on the chart; the median year is 18 days.

Longest dry spell (CDD) at Aiyansh by year
Year	Longest dry spell (CDD)
1924	15 days
1925	21 days
1926	19 days
1927	24 days
1928	29 days
1929	21 days
1930	17 days
1931	12 days
1932	21 days
1933	17 days
1934	20 days
1935	16 days
1936	17 days
1937	13 days
1938	16 days
1939	13 days
1940	12 days
1941	22 days
1942	25 days
1943	18 days
1944	17 days
1945	19 days
1946	27 days
1947	19 days
1948	15 days
1949	17 days
1950	17 days
1951	22 days
1952	24 days
1953	13 days
1954	15 days
1955	10 days
1956	21 days
1957	21 days
1958	26 days
1960	11 days
1961	18 days
1962	24 days
1963	30 days
1964	15 days
1965	23 days
1966	12 days
1967	15 days
1968	21 days
1969	18 days
1970	11 days
1971	21 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.

Rainfall Return Levels

42 years, 1924 to 1970

A day with at least 47.8 mm (1.9 in) of rain is expected about once in 2 years. A day with at least 108.3 mm (4.3 in) of rain is expected about once in 100 years.

Rainfall return levels at Aiyansh: the daily rain expected about once in a given number of years
Expected about once in	A day with at least	Note
2 years	47.8 mm (1.9 in)
5 years	64.0 mm (2.5 in)
10 years	74.7 mm (2.9 in)
25 years	88.2 mm (3.5 in)
50 years	98.3 mm (3.9 in)	Longer than the 42 years of record
100 years	108.3 mm (4.3 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 1924 to 1970.

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: 94.0 mm (3.7 in) in 1947; 90.9 mm (3.6 in) in 1962; 89.4 mm (3.5 in) in 1951.

Download the Data

Data for Aiyansh standing records by year: CSV or JSON. Field meanings are on the data page.
Data for Aiyansh 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 2025-12-31. Last revised 31 December 2025 (2025-12-31).

Year	Days with data	Share of year	Complete
1970	122	33%	No
1971	273	75%	No