Alta Lake 2 Weather Records (CA001040420)

Record envelope, standing records and threshold days for Alta Lake 2 (CA001040420), British Columbia, Canada, with 39 years of record.

Key Facts for Alta Lake 2

Alta Lake 2 (CA001040420) is a weather station in British Columbia, Canada at 50.15 latitude and -122.98 longitude, 640 m (2,100 ft) above sea level.
The station reports from 1931 to 1969, 39 years of record.
4 records set at Alta Lake 2 still stand.
Records are tracked for prcp, snow: an element needs 30 years of data to be eligible.
Alta Lake 2 set a daily record precipitation of 19.6 mm (0.8 in) on 30 September 1969.

About the Station

Location: British Columbia, Canada, 50.15 latitude, -122.98 longitude.
Elevation: 640 m (2,100 ft).
Period of record: 1931 to 1969, 39 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 Alta Lake 2. 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 Alta Lake 2, with 2026 drawn through them
Month	Highest record high	Lowest record low	2026 highest maximum	2026 lowest minimum
Jan	n/a	n/a	n/a	n/a
Feb	4.4 C (39.9 F)	-10.0 C (14.0 F)	n/a	n/a
Mar	n/a	n/a	n/a	n/a
Apr	n/a	n/a	n/a	n/a
May	n/a	n/a	n/a	n/a
Jun	n/a	n/a	n/a	n/a
Jul	n/a	n/a	n/a	n/a
Aug	n/a	n/a	n/a	n/a
Sep	n/a	n/a	n/a	n/a
Oct	n/a	n/a	n/a	n/a
Nov	n/a	n/a	n/a	n/a
Dec	n/a	n/a	n/a	n/a

Which Years Hold Standing Records

4 standing records

4 records at Alta Lake 2 still stand. 1952 holds the most, with 4.

Wettest Day of Each Month

Jan: 101.6 mm (4.0 in)

The wettest day on record for each calendar month at Alta Lake 2. The most was 101.6 mm (4.0 in) on 20 January 1935.

Record daily precipitation for each month at Alta Lake 2
Month	Record daily precipitation (mm)	Date
Jan	101.6 mm (4.0 in)	20 January 1935
Feb	58.4 mm (2.3 in)	11 February 1947
Mar	48.0 mm (1.9 in)	4 March 1968
Apr	56.4 mm (2.2 in)	28 April 1959
May	39.9 mm (1.6 in)	27 May 1939
Jun	40.1 mm (1.6 in)	8 June 1956
Jul	38.6 mm (1.5 in)	31 July 1955
Aug	45.7 mm (1.8 in)	26 August 1941
Sep	48.0 mm (1.9 in)	5 September 1957
Oct	78.0 mm (3.1 in)	24 October 1955
Nov	72.9 mm (2.9 in)	27 November 1948
Dec	100.8 mm (4.0 in)	28 December 1949

Period of Record Coverage

1952 to 1952

1 years of record at Alta Lake 2, 1952 to 1952. 1 years have data for under 90 percent of days and are left out of rankings: 1952.

Latest Records

Latest records at Alta Lake 2
Date	Station	Record	Value	Beat old record by	Old record stood	Significance
30 September 1969	Alta Lake 2, CA	daily rain	19.6 mm (0.8 in)	2.8 mm (0.11 in)	27 years	14 of 100 (Routine)
23 September 1969	Alta Lake 2, CA	daily rain	25.7 mm (1.0 in)	0.8 mm (0.03 in)	19 years	8 of 100 (Routine)
22 September 1969	Alta Lake 2, CA	daily rain	26.2 mm (1.0 in)	9.9 mm (0.39 in)	36 years	24 of 100 (Routine)
17 September 1969	Alta Lake 2, CA	daily rain	37.3 mm (1.5 in)	3.8 mm (0.15 in)	3 years	7 of 100 (Routine)
28 June 1969	Alta Lake 2, CA	daily rain	9.7 mm (0.38 in)	2.1 mm (0.08 in)	14 years	10 of 100 (Routine)
28 May 1969	Alta Lake 2, CA	daily rain	19.3 mm (0.8 in)	0.5 mm (0.02 in)	20 years	9 of 100 (Routine)
22 April 1969	Alta Lake 2, CA	daily rain	15.2 mm (0.6 in)	0.5 mm (0.02 in)	20 years	9 of 100 (Routine)
17 April 1969	Alta Lake 2, CA	daily rain	16.8 mm (0.7 in)	8.4 mm (0.33 in)	31 years	20 of 100 (Routine)
3 April 1969	Alta Lake 2, CA	daily snowfall	10.2 cm (4.0 in)	0.8 cm (0.3 in)	20 years	10 of 100 (Routine)
14 March 1969	Alta Lake 2, CA	daily snowfall	15.2 cm (6.0 in)	2.5 cm (1.0 in)	18 years	12 of 100 (Routine)
7 February 1969	Alta Lake 2, CA	daily rain	48.3 mm (1.9 in)	7.7 mm (0.30 in)	21 years	16 of 100 (Routine)
7 February 1969	Alta Lake 2, CA	daily snowfall	48.3 cm (19.0 in)	7.7 cm (3.0 in)	21 years	16 of 100 (Routine)
30 January 1969	Alta Lake 2, CA	daily snowfall	16.8 cm (6.6 in)	3.8 cm (1.5 in)	23 years	12 of 100 (Routine)
7 December 1968	Alta Lake 2, CA	daily snowfall	27.4 cm (10.8 in)	4.5 cm (1.8 in)	12 years	10 of 100 (Routine)
6 December 1968	Alta Lake 2, CA	daily snowfall	26.4 cm (10.4 in)	3.5 cm (1.4 in)	16 years	10 of 100 (Routine)
6 December 1968	Alta Lake 2, CA	daily rain	26.4 mm (1.0 in)	3.5 mm (0.14 in)	16 years	9 of 100 (Routine)
21 November 1968	Alta Lake 2, CA	daily rain	34.3 mm (1.4 in)	7.9 mm (0.31 in)	14 years	14 of 100 (Routine)
29 October 1968	Alta Lake 2, CA	daily rain	40.4 mm (1.6 in)	10.2 mm (0.4 in)	3 years	12 of 100 (Routine)
28 October 1968	Alta Lake 2, CA	daily rain	40.6 mm (1.6 in)	12.2 mm (0.5 in)	30 years	23 of 100 (Routine)
23 October 1968	Alta Lake 2, CA	daily rain	49.3 mm (1.9 in)	18.1 mm (0.7 in)	30 years	28 of 100 (Routine)

Extremes by Year

1931 to 1969

Yearly extremes at Alta Lake 2: the record and the median year
Measure	Record	Year of the record	Median year	Years with a value
Hottest day (TXx)	4.4 C (39.9 F)	1952	4.4 C (39.9 F)	1
Coldest night (TNn)	-10.0 C (14.0 F)	1952	-10.0 C (14.0 F)	1
Wettest day (Rx1day)	101.6 mm (4.0 in)	1935	53.3 mm (2.1 in)	39
Wettest five days (Rx5day)	284.6 mm (11.2 in)	1935	122.3 mm (4.8 in)	39
Longest dry spell (CDD)	50 days	1960	21 days	39

Hottest day (TXx)

The hottest day of the year at Alta Lake 2, 1931 to 1969. The record is 4.4 C (39.9 F) in 1952, marked on the chart; the median year is 4.4 C (39.9 F).

Hottest day (TXx) at Alta Lake 2 by year
Year	Hottest day (TXx)
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	4.4 C (39.9 F)
1953	n/a
1954	n/a
1955	n/a
1956	n/a
1957	n/a
1958	n/a
1959	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

Coldest night (TNn)

The coldest night of the year at Alta Lake 2, 1931 to 1969. The record is -10.0 C (14.0 F) in 1952, marked on the chart; the median year is -10.0 C (14.0 F).

Coldest night (TNn) at Alta Lake 2 by year
Year	Coldest night (TNn)
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	-10.0 C (14.0 F)
1953	n/a
1954	n/a
1955	n/a
1956	n/a
1957	n/a
1958	n/a
1959	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

Wettest day (Rx1day)

The wettest day of the year at Alta Lake 2, 1931 to 1969. The record is 101.6 mm (4.0 in) in 1935, marked on the chart; the median year is 53.3 mm (2.1 in).

Wettest day (Rx1day) at Alta Lake 2 by year
Year	Wettest day (Rx1day)
1931	43.2 mm (1.7 in)
1932	58.4 mm (2.3 in)
1933	61.0 mm (2.4 in)
1934	63.5 mm (2.5 in)
1935	101.6 mm (4.0 in)
1936	45.7 mm (1.8 in)
1937	58.4 mm (2.3 in)
1938	45.7 mm (1.8 in)
1939	55.9 mm (2.2 in)
1940	57.9 mm (2.3 in)
1941	75.4 mm (3.0 in)
1942	45.7 mm (1.8 in)
1943	39.1 mm (1.5 in)
1944	37.8 mm (1.5 in)
1945	43.9 mm (1.7 in)
1946	45.7 mm (1.8 in)
1947	58.4 mm (2.3 in)
1948	72.9 mm (2.9 in)
1949	100.8 mm (4.0 in)
1950	51.6 mm (2.0 in)
1951	73.7 mm (2.9 in)
1952	26.4 mm (1.0 in)
1953	45.0 mm (1.8 in)
1954	49.0 mm (1.9 in)
1955	78.0 mm (3.1 in)
1956	52.1 mm (2.1 in)
1957	53.3 mm (2.1 in)
1958	49.0 mm (1.9 in)
1959	56.4 mm (2.2 in)
1960	62.7 mm (2.5 in)
1961	45.2 mm (1.8 in)
1962	40.6 mm (1.6 in)
1963	62.0 mm (2.4 in)
1964	59.2 mm (2.3 in)
1965	48.5 mm (1.9 in)
1966	50.8 mm (2.0 in)
1967	81.3 mm (3.2 in)
1968	62.0 mm (2.4 in)
1969	48.3 mm (1.9 in)

Wettest five days (Rx5day)

The wettest five days of the year at Alta Lake 2, 1931 to 1969. The record is 284.6 mm (11.2 in) in 1935, marked on the chart; the median year is 122.3 mm (4.8 in).

Wettest five days (Rx5day) at Alta Lake 2 by year
Year	Wettest five days (Rx5day)
1931	101.6 mm (4.0 in)
1932	159.3 mm (6.3 in)
1933	172.8 mm (6.8 in)
1934	115.8 mm (4.6 in)
1935	284.6 mm (11.2 in)
1936	116.8 mm (4.6 in)
1937	157.0 mm (6.2 in)
1938	118.5 mm (4.7 in)
1939	127.7 mm (5.0 in)
1940	127.0 mm (5.0 in)
1941	132.6 mm (5.2 in)
1942	92.9 mm (3.7 in)
1943	86.9 mm (3.4 in)
1944	90.4 mm (3.6 in)
1945	114.0 mm (4.5 in)
1946	98.6 mm (3.9 in)
1947	132.8 mm (5.2 in)
1948	182.5 mm (7.2 in)
1949	150.8 mm (5.9 in)
1950	127.2 mm (5.0 in)
1951	140.2 mm (5.5 in)
1952	78.2 mm (3.1 in)
1953	107.2 mm (4.2 in)
1954	118.8 mm (4.7 in)
1955	136.7 mm (5.4 in)
1956	106.6 mm (4.2 in)
1957	122.3 mm (4.8 in)
1958	98.7 mm (3.9 in)
1959	124.1 mm (4.9 in)
1960	103.1 mm (4.1 in)
1961	116.1 mm (4.6 in)
1962	102.5 mm (4.0 in)
1963	136.9 mm (5.4 in)
1964	119.7 mm (4.7 in)
1965	138.2 mm (5.4 in)
1966	126.3 mm (5.0 in)
1967	133.4 mm (5.3 in)
1968	137.4 mm (5.4 in)
1969	90.2 mm (3.6 in)

Longest dry spell (CDD)

The longest dry spell of the year at Alta Lake 2, 1931 to 1969. The record is 50 days in 1960, marked on the chart; the median year is 21 days.

Longest dry spell (CDD) at Alta Lake 2 by year
Year	Longest dry spell (CDD)
1931	6 days
1932	16 days
1933	21 days
1934	30 days
1935	23 days
1936	31 days
1937	21 days
1938	26 days
1939	27 days
1940	26 days
1941	22 days
1942	19 days
1943	21 days
1944	20 days
1945	18 days
1946	27 days
1947	14 days
1948	12 days
1949	16 days
1950	27 days
1951	25 days
1952	28 days
1953	10 days
1954	16 days
1955	23 days
1956	26 days
1957	18 days
1958	26 days
1959	21 days
1960	50 days
1961	20 days
1962	16 days
1963	24 days
1964	10 days
1965	21 days
1966	18 days
1967	42 days
1968	16 days
1969	24 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

36 years, 1932 to 1968

A day with at least 54.6 mm (2.1 in) of rain is expected about once in 2 years. A day with at least 110.0 mm (4.3 in) of rain is expected about once in 100 years.

Rainfall return levels at Alta Lake 2: the daily rain expected about once in a given number of years
Expected about once in	A day with at least	Note
2 years	54.6 mm (2.1 in)
5 years	68.7 mm (2.7 in)
10 years	78.4 mm (3.1 in)
25 years	90.9 mm (3.6 in)
50 years	100.4 mm (4.0 in)	Longer than the 36 years of record
100 years	110.0 mm (4.3 in)	Longer than the 36 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, 36 years of values from 1932 to 1968.

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: 101.6 mm (4.0 in) in 1935; 100.8 mm (4.0 in) in 1949; 81.3 mm (3.2 in) in 1967.

Download the Data

Data for Alta Lake 2 standing records by year: CSV or JSON. Field meanings are on the data page.
Data for Alta Lake 2 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.

Data as of 2025-12-31. Last revised 31 December 2025 (2025-12-31).