William Head Weather Records (CA001018935)

Record envelope, standing records and threshold days for William Head (CA001018935), British Columbia, Canada, with 60 years of record.

Key Facts for William Head

William Head (CA001018935) is a weather station in British Columbia, Canada at 48.33 latitude and -123.53 longitude, 12 m (39 ft) above sea level.
The station reports from 1959 to 2018, 60 years of record.
1,464 records set at William Head still stand.
Records are tracked for no element yet: an element needs 30 years of data to be eligible.

About the Station

Location: British Columbia, Canada, 48.33 latitude, -123.53 longitude.
Elevation: 12 m (39 ft).
Period of record: 1959 to 2018, 60 years.
Eligible elements: none yet.

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 William Head. 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 William Head, with 2026 drawn through them
Month	Highest record high	Lowest record low	2026 highest maximum	2026 lowest minimum
Jan	15.0 C (59.0 F)	-8.5 C (16.7 F)	n/a	n/a
Feb	16.7 C (62.1 F)	-7.5 C (18.5 F)	n/a	n/a
Mar	16.1 C (61.0 F)	-3.3 C (26.1 F)	n/a	n/a
Apr	21.0 C (69.8 F)	-0.6 C (30.9 F)	n/a	n/a
May	28.9 C (84.0 F)	1.1 C (34.0 F)	n/a	n/a
Jun	29.4 C (84.9 F)	3.9 C (39.0 F)	n/a	n/a
Jul	28.9 C (84.0 F)	6.5 C (43.7 F)	n/a	n/a
Aug	31.1 C (88.0 F)	5.0 C (41.0 F)	n/a	n/a
Sep	25.6 C (78.1 F)	2.2 C (36.0 F)	n/a	n/a
Oct	20.6 C (69.1 F)	0.0 C (32.0 F)	n/a	n/a
Nov	17.2 C (63.0 F)	-2.8 C (27.0 F)	n/a	n/a
Dec	16.0 C (60.8 F)	-13.9 C (7.0 F)	n/a	n/a

Which Years Hold Standing Records

1,464 standing records

1,464 records at William Head still stand. 1972 holds the most, with 107.

Standing records at William Head by the year they were set
Year set	Standing records
1959	16
1960	63
1961	83
1962	56
1963	84
1964	53
1965	71
1966	58
1967	64
1968	73
1969	64
1970	35
1971	63
1972	107
1973	49
1974	45
1975	58
1976	29
1977	56
1978	63
1979	43
1980	63
1981	48
1982	56
1983	64

Wettest Day of Each Month

Jan: 82.3 mm (3.2 in)

The wettest day on record for each calendar month at William Head. The most was 82.3 mm (3.2 in) on 18 January 1968.

Record daily precipitation for each month at William Head
Month	Record daily precipitation (mm)	Date
Jan	82.3 mm (3.2 in)	18 January 1968
Feb	67.3 mm (2.6 in)	20 February 1961
Mar	47.8 mm (1.9 in)	5 March 1972
Apr	23.9 mm (0.9 in)	19 April 1965
May	50.8 mm (2.0 in)	5 May 1960
Jun	19.6 mm (0.8 in)	7 June 1980
Jul	20.8 mm (0.8 in)	11 July 1972
Aug	38.4 mm (1.5 in)	22 August 1975
Sep	38.1 mm (1.5 in)	29 September 1964
Oct	44.5 mm (1.8 in)	21 October 1963
Nov	55.4 mm (2.2 in)	18 November 1962
Dec	66.3 mm (2.6 in)	8 December 1971

Period of Record Coverage

1959 to 1983

25 years of record at William Head, 1959 to 1983. 2 years have data for under 90 percent of days and are left out of rankings: 1959, 1962.

Days with data per year at William Head
Year	Days with data	Share of year	Complete
1959	41	11%	No
1960	366	100%	Yes
1961	353	97%	Yes
1962	306	84%	No
1963	365	100%	Yes
1964	351	96%	Yes
1965	365	100%	Yes
1966	365	100%	Yes
1967	365	100%	Yes
1968	365	100%	Yes
1969	364	100%	Yes
1970	364	100%	Yes
1971	365	100%	Yes
1972	366	100%	Yes
1973	365	100%	Yes
1974	365	100%	Yes
1975	365	100%	Yes
1976	334	91%	Yes
1977	332	91%	Yes
1978	365	100%	Yes
1979	365	100%	Yes
1980	366	100%	Yes
1981	365	100%	Yes
1982	363	99%	Yes
1983	363	99%	Yes

Latest Records

No records were set at this station in the latest data.

Climate Trend

19 complete years, 1960 to 1983

One stripe for each of 19 complete years at William Head, 1960 to 1983. Blue stripes are years cooler than the station's own mean of 9.6 C (49.2 F); red stripes are warmer. The coolest year was 1972, at 8.8 C (47.9 F), and the warmest was 1963, at 10.2 C (50.4 F). The strongest colour marks a difference of 0.8 C (1.4 F).

Annual mean temperature at William Head as warming stripes, 1960 to 1983
Year	Annual mean temperature	Difference from the station mean
1960	10.2 C	+0.61 C
1963	10.2 C	+0.66 C
1965	8.9 C	-0.70 C
1966	9.1 C	-0.46 C
1967	9.3 C	-0.25 C
1968	9.9 C	+0.33 C
1969	9.8 C	+0.22 C
1970	10.0 C	+0.43 C
1971	9.2 C	-0.37 C
1972	8.8 C	-0.73 C
1973	9.7 C	+0.14 C
1974	9.8 C	+0.20 C
1975	9.3 C	-0.25 C
1978	9.9 C	+0.31 C
1979	9.9 C	+0.29 C
1980	9.5 C	-0.07 C
1981	9.8 C	+0.27 C
1982	8.9 C	-0.66 C
1983	9.6 C	+0.06 C

This station does not have enough complete years (30 are needed) to fit a temperature trend.

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

1959 to 1983

Yearly extremes at William Head: the record and the median year
Measure	Record	Year of the record	Median year	Years with a value
Hottest day (TXx)	31.1 C (88.0 F)	1960	27.2 C (81.0 F)	25
Coldest night (TNn)	-13.9 C (7.0 F)	1968	-5.0 C (23.0 F)	25
Wettest day (Rx1day)	82.3 mm (3.2 in)	1968	45.2 mm (1.8 in)	25
Wettest five days (Rx5day)	162.8 mm (6.4 in)	1975	91.1 mm (3.6 in)	25
Longest dry spell (CDD)	59 days	1974	32 days	25

Hottest day (TXx)

The hottest day of the year at William Head, 1959 to 1983. The record is 31.1 C (88.0 F) in 1960, marked on the chart; the median year is 27.2 C (81.0 F).

Hottest day (TXx) at William Head by year
Year	Hottest day (TXx)
1959	15.6 C (60.1 F)
1960	31.1 C (88.0 F)
1961	28.9 C (84.0 F)
1962	26.1 C (79.0 F)
1963	25.6 C (78.1 F)
1964	24.4 C (75.9 F)
1965	27.8 C (82.0 F)
1966	29.4 C (84.9 F)
1967	26.7 C (80.1 F)
1968	27.8 C (82.0 F)
1969	28.9 C (84.0 F)
1970	28.3 C (82.9 F)
1971	27.2 C (81.0 F)
1972	27.2 C (81.0 F)
1973	27.2 C (81.0 F)
1974	26.7 C (80.1 F)
1975	25.6 C (78.1 F)
1976	23.3 C (73.9 F)
1977	29.5 C (85.1 F)
1978	27.0 C (80.6 F)
1979	28.5 C (83.3 F)
1980	27.0 C (80.6 F)
1981	28.5 C (83.3 F)
1982	26.5 C (79.7 F)
1983	29.0 C (84.2 F)

Coldest night (TNn)

The coldest night of the year at William Head, 1959 to 1983. The record is -13.9 C (7.0 F) in 1968, marked on the chart; the median year is -5.0 C (23.0 F).

Coldest night (TNn) at William Head by year
Year	Coldest night (TNn)
1959	-1.1 C (30.0 F)
1960	-3.3 C (26.1 F)
1961	-3.3 C (26.1 F)
1962	-2.8 C (27.0 F)
1963	-6.7 C (19.9 F)
1964	-13.3 C (8.1 F)
1965	-3.3 C (26.1 F)
1966	-1.7 C (28.9 F)
1967	-2.8 C (27.0 F)
1968	-13.9 C (7.0 F)
1969	-8.3 C (17.1 F)
1970	-2.2 C (28.0 F)
1971	-5.0 C (23.0 F)
1972	-8.3 C (17.1 F)
1973	-5.6 C (21.9 F)
1974	-6.1 C (21.0 F)
1975	-3.3 C (26.1 F)
1976	-3.3 C (26.1 F)
1977	-2.0 C (28.4 F)
1978	-8.5 C (16.7 F)
1979	-7.5 C (18.5 F)
1980	-6.5 C (20.3 F)
1981	-3.5 C (25.7 F)
1982	-8.5 C (16.7 F)
1983	-8.5 C (16.7 F)

Wettest day (Rx1day)

The wettest day of the year at William Head, 1959 to 1983. The record is 82.3 mm (3.2 in) in 1968, marked on the chart; the median year is 45.2 mm (1.8 in).

Wettest day (Rx1day) at William Head by year
Year	Wettest day (Rx1day)
1959	42.9 mm (1.7 in)
1960	50.8 mm (2.0 in)
1961	67.3 mm (2.6 in)
1962	55.4 mm (2.2 in)
1963	44.5 mm (1.8 in)
1964	38.1 mm (1.5 in)
1965	34.8 mm (1.4 in)
1966	30.2 mm (1.2 in)
1967	45.2 mm (1.8 in)
1968	82.3 mm (3.2 in)
1969	24.9 mm (1.0 in)
1970	27.9 mm (1.1 in)
1971	66.3 mm (2.6 in)
1972	64.8 mm (2.6 in)
1973	42.7 mm (1.7 in)
1974	57.9 mm (2.3 in)
1975	56.9 mm (2.2 in)
1976	44.5 mm (1.8 in)
1977	33.8 mm (1.3 in)
1978	37.2 mm (1.5 in)
1979	50.0 mm (2.0 in)
1980	62.0 mm (2.4 in)
1981	31.8 mm (1.3 in)
1982	65.8 mm (2.6 in)
1983	54.2 mm (2.1 in)

Wettest five days (Rx5day)

The wettest five days of the year at William Head, 1959 to 1983. The record is 162.8 mm (6.4 in) in 1975, marked on the chart; the median year is 91.1 mm (3.6 in).

Wettest five days (Rx5day) at William Head by year
Year	Wettest five days (Rx5day)
1959	88.1 mm (3.5 in)
1960	66.1 mm (2.6 in)
1961	119.2 mm (4.7 in)
1962	116.6 mm (4.6 in)
1963	88.4 mm (3.5 in)
1964	77.0 mm (3.0 in)
1965	78.4 mm (3.1 in)
1966	83.1 mm (3.3 in)
1967	97.6 mm (3.8 in)
1968	94.7 mm (3.7 in)
1969	73.2 mm (2.9 in)
1970	64.7 mm (2.5 in)
1971	102.1 mm (4.0 in)
1972	134.9 mm (5.3 in)
1973	60.0 mm (2.4 in)
1974	113.1 mm (4.5 in)
1975	162.8 mm (6.4 in)
1976	91.1 mm (3.6 in)
1977	68.6 mm (2.7 in)
1978	74.6 mm (2.9 in)
1979	142.4 mm (5.6 in)
1980	91.4 mm (3.6 in)
1981	87.2 mm (3.4 in)
1982	96.0 mm (3.8 in)
1983	129.6 mm (5.1 in)

Longest dry spell (CDD)

The longest dry spell of the year at William Head, 1959 to 1983. The record is 59 days in 1974, marked on the chart; the median year is 32 days.

Longest dry spell (CDD) at William Head by year
Year	Longest dry spell (CDD)
1959	7 days
1960	55 days
1961	40 days
1962	27 days
1963	26 days
1964	17 days
1965	38 days
1966	24 days
1967	42 days
1968	24 days
1969	32 days
1970	34 days
1971	41 days
1972	32 days
1973	40 days
1974	59 days
1975	42 days
1976	13 days
1977	21 days
1978	42 days
1979	34 days
1980	27 days
1981	40 days
1982	30 days
1983	31 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.

Download the Data

Data for William Head standing records by year: CSV or JSON. Field meanings are on the data page.
Data for William Head 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 2026-10-15 (15 October 2026). Records are computed by this site and are not official.

Data as of 2026-10-15. Last revised 15 October 2026 (2026-10-15).