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Cowichan Lake Forestry Weather Records (CA001012040)

Record envelope, standing records and threshold days for Cowichan Lake Forestry (CA001012040), British Columbia, Canada, with 70 years of record.

Key Facts for Cowichan Lake Forestry

  • Cowichan Lake Forestry (CA001012040) is a weather station in British Columbia, Canada at 48.82 latitude and -124.13 longitude, 177 m (581 ft) above sea level.
  • The station reports from 1949 to 2018, 70 years of record.
  • 1,464 records set at Cowichan Lake Forestry still stand.
  • Records are tracked for tmax, tmin, prcp, snow: an element needs 30 years of data to be eligible.
  • Cowichan Lake Forestry set a daily record low minimum temperature of -8.5 C (16.7 F) on 24 December 1983.

About the Station

  • Location: British Columbia, Canada, 48.82 latitude, -124.13 longitude.
  • Elevation: 177 m (581 ft).
  • Period of record: 1949 to 2018, 70 years.
  • Eligible elements: tmax, tmin, prcp, snow.

Daily Record Envelope and 2026

0 days at or beyond a record
Daily record high and record low at Cowichan Lake Forestry, with 2026 drawn through them The band shows the record high and record low for each calendar day at Cowichan Lake Forestry. The lines show the 2026 daily maximum and minimum. 0 days in 2026 matched or passed a record. Temperatures are in degrees Celsius. -2002040 JanFebMarAprMayJunJulAugSepOctNovDec
The band shows the record high and record low for each calendar day at Cowichan Lake Forestry. 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 Cowichan Lake Forestry, with 2026 drawn through them
MonthHighest record highLowest record low2026 highest maximum2026 lowest minimum
Jan13.3 C (55.9 F)-17.8 C (0.0 F)n/an/a
Feb18.3 C (64.9 F)-16.7 C (1.9 F)n/an/a
Mar20.0 C (68.0 F)-14.4 C (6.1 F)n/an/a
Apr24.4 C (75.9 F)-5.6 C (21.9 F)n/an/a
May33.0 C (91.4 F)-3.9 C (25.0 F)n/an/a
Jun35.0 C (95.0 F)0.6 C (33.1 F)n/an/a
Jul37.2 C (99.0 F)1.7 C (35.1 F)n/an/a
Aug38.0 C (100.4 F)3.9 C (39.0 F)n/an/a
Sep33.9 C (93.0 F)-1.1 C (30.0 F)n/an/a
Oct26.1 C (79.0 F)-4.4 C (24.1 F)n/an/a
Nov18.3 C (64.9 F)-14.4 C (6.1 F)n/an/a
Dec15.0 C (59.0 F)-15.0 C (5.0 F)n/an/a

Which Years Hold Standing Records

1,464 standing records
Standing records at Cowichan Lake Forestry by the year they were set 1,464 records at Cowichan Lake Forestry still stand. 1950 holds the most, with 82. 02550751001949: 481950: 821951: 601952: 431953: 251954: 481955: 681956: 541957: 371958: 501959: 221960: 441961: 401962: 551963: 481964: 201965: 391966: 281967: 371968: 441969: 521970: 361971: 351972: 541973: 361974: 301975: 301976: 351977: 391978: 251979: 431980: 401981: 471982: 311983: 39194919531957196119651969197319771981
1,464 records at Cowichan Lake Forestry still stand. 1950 holds the most, with 82.
Standing records at Cowichan Lake Forestry by the year they were set
Year setStanding records
194948
195082
195160
195243
195325
195448
195568
195654
195737
195850
195922
196044
196140
196255
196348
196420
196539
196628
196737
196844
196952
197036
197135
197254
197336
197430
197530
197635
197739
197825
197943
198040
198147
198231
198339

All-Time Record Progression

1 new records
When Cowichan Lake Forestry set new all-time records 1 all-time records were set at Cowichan Lake Forestry between 8 August 1981 and 8 August 1981. Each dot is a new record. Record high maximum temperature8 August 1981: Record high maximum temperature 38.0 C (100.4 F)
1 all-time records were set at Cowichan Lake Forestry between 8 August 1981 and 8 August 1981. Each dot is a new record.
When Cowichan Lake Forestry set new all-time records
DateKindDetail
1981-08-08Record high maximum temperatureRecord high maximum temperature 38.0 C (100.4 F)

Wettest Day of Each Month

Jan: 145.5 mm (5.7 in)
Record daily precipitation for each month at Cowichan Lake Forestry The wettest day on record for each calendar month at Cowichan Lake Forestry. The most was 145.5 mm (5.7 in) on 14 January 1961. 050100150 Jan: 145.5 mm (5.7 in), 14 January 1961 Jan Feb: 103.6 mm (4.1 in), 19 February 1983 Feb Mar: 94.1 mm (3.7 in), 8 March 1983 Mar Apr: 76.7 mm (3.0 in), 5 April 1970 Apr May: 57.7 mm (2.3 in), 23 May 1973 May Jun: 57.9 mm (2.3 in), 8 June 1956 Jun Jul: 51.6 mm (2.0 in), 16 July 1974 Jul Aug: 40.6 mm (1.6 in), 22 August 1975 Aug Sep: 57.2 mm (2.3 in), 27 September 1953 Sep Oct: 112.0 mm (4.4 in), 20 October 1963 Oct Nov: 119.4 mm (4.7 in), 14 November 1983 Nov Dec: 115.8 mm (4.6 in), 28 December 1949 Dec
The wettest day on record for each calendar month at Cowichan Lake Forestry. The most was 145.5 mm (5.7 in) on 14 January 1961.
Record daily precipitation for each month at Cowichan Lake Forestry
MonthRecord daily precipitation (mm)Date
Jan145.5 mm (5.7 in)14 January 1961
Feb103.6 mm (4.1 in)19 February 1983
Mar94.1 mm (3.7 in)8 March 1983
Apr76.7 mm (3.0 in)5 April 1970
May57.7 mm (2.3 in)23 May 1973
Jun57.9 mm (2.3 in)8 June 1956
Jul51.6 mm (2.0 in)16 July 1974
Aug40.6 mm (1.6 in)22 August 1975
Sep57.2 mm (2.3 in)27 September 1953
Oct112.0 mm (4.4 in)20 October 1963
Nov119.4 mm (4.7 in)14 November 1983
Dec115.8 mm (4.6 in)28 December 1949

Period of Record Coverage

1949 to 1983
Days with data per year at Cowichan Lake Forestry 35 years of record at Cowichan Lake Forestry, 1949 to 1983. 1 years have data for under 90 percent of days and are left out of rankings: 1949. 1949: 266 of 365 days1950: 365 of 365 days1951: 365 of 365 days1952: 366 of 366 days1953: 365 of 365 days1954: 365 of 365 days1955: 365 of 365 days1956: 364 of 366 days1957: 348 of 365 days1958: 336 of 365 days1959: 360 of 365 days1960: 366 of 366 days1961: 365 of 365 days1962: 365 of 365 days1963: 365 of 365 days1964: 366 of 366 days1965: 365 of 365 days1966: 364 of 365 days1967: 365 of 365 days1968: 366 of 366 days1969: 365 of 365 days1970: 365 of 365 days1971: 364 of 365 days1972: 366 of 366 days1973: 363 of 365 days1974: 365 of 365 days1975: 365 of 365 days1976: 365 of 366 days1977: 365 of 365 days1978: 365 of 365 days1979: 365 of 365 days1980: 366 of 366 days1981: 365 of 365 days1982: 365 of 365 days1983: 365 of 365 days1950195519601965197019751980
35 years of record at Cowichan Lake Forestry, 1949 to 1983. 1 years have data for under 90 percent of days and are left out of rankings: 1949.
Days with data per year at Cowichan Lake Forestry
YearDays with dataShare of yearComplete
194926673%No
1950365100%Yes
1951365100%Yes
1952366100%Yes
1953365100%Yes
1954365100%Yes
1955365100%Yes
195636499%Yes
195734895%Yes
195833692%Yes
195936099%Yes
1960366100%Yes
1961365100%Yes
1962365100%Yes
1963365100%Yes
1964366100%Yes
1965365100%Yes
1966364100%Yes
1967365100%Yes
1968366100%Yes
1969365100%Yes
1970365100%Yes
1971364100%Yes
1972366100%Yes
197336399%Yes
1974365100%Yes
1975365100%Yes
1976365100%Yes
1977365100%Yes
1978365100%Yes
1979365100%Yes
1980366100%Yes
1981365100%Yes
1982365100%Yes
1983365100%Yes

Latest Records

20
Latest records at Cowichan Lake Forestry
DateStationRecordValueBeat old record byOld record stoodSignificance
24 December 1983Cowichan Lake Forestry, CAdaily low min-8.5 C (16.7 F)2.9 C (5.2 F)33 years20 of 100 (Routine)
23 December 1983Cowichan Lake Forestry, CAdaily low max-6.5 C (20.3 F)4.8 C (8.6 F)32 years26 of 100 (Routine)
23 December 1983Cowichan Lake Forestry, CAdaily low min-13.5 C (7.7 F)4.6 C (8.3 F)32 years24 of 100 (Routine)
22 December 1983Cowichan Lake Forestry, CAdaily low max-4.5 C (23.9 F)3.4 C (6.1 F)12 years16 of 100 (Routine)
22 December 1983Cowichan Lake Forestry, CAdaily low min-10.0 C (14.0 F)3.9 C (7.0 F)12 years16 of 100 (Routine)
21 December 1983Cowichan Lake Forestry, CAdaily low min-10.0 C (14.0 F)5.6 C (10.1 F)33 years28 of 100 (Routine)
21 December 1983Cowichan Lake Forestry, CAdaily low max-4.5 C (23.9 F)5.1 C (9.2 F)14 years22 of 100 (Routine)
20 December 1983Cowichan Lake Forestry, CAdaily low max-4.0 C (24.8 F)2.9 C (5.2 F)16 years15 of 100 (Routine)
7 December 1983Cowichan Lake Forestry, CAdaily rain45.7 mm (1.8 in)2.8 mm (0.11 in)18 years9 of 100 (Routine)
2 December 1983Cowichan Lake Forestry, CAdaily low max1.0 C (33.8 F)0.5 C (0.9 F)2 years4 of 100 (Routine)
1 December 1983Cowichan Lake Forestry, CAdaily low min-5.0 C (23.0 F)1.1 C (2.0 F)28 years13 of 100 (Routine)
30 November 1983Cowichan Lake Forestry, CAdaily low min-3.5 C (25.7 F)0.2 C (0.4 F)6 years5 of 100 (Routine)
19 November 1983Cowichan Lake Forestry, CAdaily rain54.5 mm (2.1 in)14.4 mm (0.6 in)24 years18 of 100 (Routine)
16 November 1983Cowichan Lake Forestry, CAdaily high min8.5 C (47.3 F)0.2 C (0.4 F)12 years6 of 100 (Routine)
16 November 1983Cowichan Lake Forestry, CAdaily rain40.1 mm (1.6 in)1.0 mm (0.04 in)6 years5 of 100 (Routine)
15 November 1983Cowichan Lake Forestry, CAdaily rain94.4 mm (3.7 in)56.3 mm (2.2 in)12 years38 of 100 (Notable)
15 November 1983Cowichan Lake Forestry, CAdaily high max13.0 C (55.4 F)1.9 C (3.4 F)33 years18 of 100 (Routine)
14 November 1983Cowichan Lake Forestry, CAmonthly rain119.4 mm (4.7 in)3.3 mm (0.13 in)33 years24 of 100 (Routine)
10 November 1983Cowichan Lake Forestry, CAdaily rain50.0 mm (2.0 in)4.6 mm (0.18 in)1 year5 of 100 (Routine)
9 November 1983Cowichan Lake Forestry, CAdaily rain55.3 mm (2.2 in)11.4 mm (0.4 in)12 years12 of 100 (Routine)

Climate Trend

33 complete years, 1950 to 1983
Annual mean temperature at Cowichan Lake Forestry as warming stripes, 1950 to 1983 One stripe for each of 33 complete years at Cowichan Lake Forestry, 1950 to 1983. Blue stripes are years cooler than the station's own mean of 9.1 C (48.3 F); red stripes are warmer. The coolest year was 1955, at 7.2 C (44.9 F), and the warmest was 1967, at 10.4 C (50.8 F). The strongest colour marks a difference of 1.9 C (3.4 F). 1950: 7.7 C, -1.4 C from the station mean1951: 8.6 C, -0.4 C from the station mean1952: 8.8 C, -0.3 C from the station mean1953: 9.0 C, 0.0 C from the station mean1954: 7.8 C, -1.2 C from the station mean1955: 7.2 C, -1.9 C from the station mean1956: 8.3 C, -0.8 C from the station mean1957: 8.6 C, -0.5 C from the station mean1959: 8.7 C, -0.3 C from the station mean1960: 9.0 C, -0.1 C from the station mean1961: 9.6 C, +0.5 C from the station mean1962: 9.1 C, +0.1 C from the station mean1963: 9.7 C, +0.6 C from the station mean1964: 8.6 C, -0.5 C from the station mean1965: 9.5 C, +0.4 C from the station mean1966: 9.5 C, +0.5 C from the station mean1967: 10.4 C, +1.4 C from the station mean1968: 9.7 C, +0.6 C from the station mean1969: 9.4 C, +0.3 C from the station mean1970: 9.7 C, +0.7 C from the station mean1971: 9.0 C, -0.1 C from the station mean1972: 9.1 C, 0.0 C from the station mean1973: 9.3 C, +0.3 C from the station mean1974: 9.3 C, +0.2 C from the station mean1975: 8.4 C, -0.6 C from the station mean1976: 8.8 C, -0.2 C from the station mean1977: 9.1 C, 0.0 C from the station mean1978: 9.5 C, +0.4 C from the station mean1979: 9.7 C, +0.7 C from the station mean1980: 9.5 C, +0.4 C from the station mean1981: 9.9 C, +0.8 C from the station mean1982: 9.2 C, +0.1 C from the station mean1983: 9.6 C, +0.6 C from the station mean1950195519601965197019751980
One stripe for each of 33 complete years at Cowichan Lake Forestry, 1950 to 1983. Blue stripes are years cooler than the station's own mean of 9.1 C (48.3 F); red stripes are warmer. The coolest year was 1955, at 7.2 C (44.9 F), and the warmest was 1967, at 10.4 C (50.8 F). The strongest colour marks a difference of 1.9 C (3.4 F).
Annual mean temperature at Cowichan Lake Forestry as warming stripes, 1950 to 1983
YearAnnual mean temperatureDifference from the station mean
19507.7 C-1.38 C
19518.6 C-0.43 C
19528.8 C-0.28 C
19539.0 C-0.02 C
19547.8 C-1.22 C
19557.2 C-1.89 C
19568.3 C-0.81 C
19578.6 C-0.49 C
19598.7 C-0.33 C
19609.0 C-0.11 C
19619.6 C+0.52 C
19629.1 C+0.07 C
19639.7 C+0.62 C
19648.6 C-0.51 C
19659.5 C+0.40 C
19669.5 C+0.46 C
196710.4 C+1.38 C
19689.7 C+0.61 C
19699.4 C+0.31 C
19709.7 C+0.66 C
19719.0 C-0.06 C
19729.1 C-0.01 C
19739.3 C+0.28 C
19749.3 C+0.19 C
19758.4 C-0.64 C
19768.8 C-0.24 C
19779.1 C+0.01 C
19789.5 C+0.44 C
19799.7 C+0.67 C
19809.5 C+0.44 C
19819.9 C+0.81 C
19829.2 C+0.09 C
19839.6 C+0.58 C

The annual mean temperature here has risen by 0.4 C (0.2 to 0.6) per decade over 1950 to 1983. In Fahrenheit: 0.7 F (0.3 to 1.1) per decade. The slope is a straight line fitted to 33 complete years; the brackets give its 95 percent interval.

Fitted temperature trends per decade at Cowichan Lake Forestry
MeasurePer decade (C)Per decade (F)PeriodComplete yearsReading
Annual mean temperature0.4 C (0.2 to 0.6) per decade0.7 F (0.3 to 1.1) per decade1950 to 198333Rise
Mean daily maximum0.3 C (0.1 to 0.6) per decade0.6 F (0.2 to 1.0) per decade1950 to 198333Rise
Mean daily minimum0.4 C (0.2 to 0.7) per decade0.8 F (0.3 to 1.2) per decade1950 to 198333Rise

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

1949 to 1983
Yearly extremes at Cowichan Lake Forestry: the record and the median year
MeasureRecordYear of the recordMedian yearYears with a value
Hottest day (TXx)38.0 C (100.4 F)198133.9 C (93.0 F)35
Coldest night (TNn)-17.8 C (0.0 F)1950-10.6 C (12.9 F)35
Wettest day (Rx1day)145.5 mm (5.7 in)196188.4 mm (3.5 in)35
Wettest five days (Rx5day)338.5 mm (13.3 in)1974197.8 mm (7.8 in)35
Longest dry spell (CDD)54 days196026 days35

Hottest day (TXx)

Hottest day (TXx) at Cowichan Lake Forestry by year The hottest day of the year at Cowichan Lake Forestry, 1949 to 1983. The record is 38.0 C (100.4 F) in 1981, marked on the chart; the median year is 33.9 C (93.0 F). 27.53032.53537.5401950196019701980Record: 38.0 C (100.4 F) in 1981
The hottest day of the year at Cowichan Lake Forestry, 1949 to 1983. The record is 38.0 C (100.4 F) in 1981, marked on the chart; the median year is 33.9 C (93.0 F).
Hottest day (TXx) at Cowichan Lake Forestry by year
YearHottest day (TXx)
194931.7 C (89.1 F)
195032.2 C (90.0 F)
195134.4 C (93.9 F)
195235.6 C (96.1 F)
195332.8 C (91.0 F)
195428.3 C (82.9 F)
195533.3 C (91.9 F)
195632.8 C (91.0 F)
195729.4 C (84.9 F)
195836.1 C (97.0 F)
195935.0 C (95.0 F)
196035.6 C (96.1 F)
196135.6 C (96.1 F)
196232.8 C (91.0 F)
196331.7 C (89.1 F)
196429.4 C (84.9 F)
196537.8 C (100.0 F)
196634.4 C (93.9 F)
196736.7 C (98.1 F)
196833.9 C (93.0 F)
196935.0 C (95.0 F)
197033.9 C (93.0 F)
197136.7 C (98.1 F)
197235.6 C (96.1 F)
197333.9 C (93.0 F)
197433.9 C (93.0 F)
197532.2 C (90.0 F)
197628.3 C (82.9 F)
197735.6 C (96.1 F)
197836.7 C (98.1 F)
197933.5 C (92.3 F)
198032.0 C (89.6 F)
198138.0 C (100.4 F)
198234.0 C (93.2 F)
198333.0 C (91.4 F)

Coldest night (TNn)

Coldest night (TNn) at Cowichan Lake Forestry by year The coldest night of the year at Cowichan Lake Forestry, 1949 to 1983. The record is -17.8 C (0.0 F) in 1950, marked on the chart; the median year is -10.6 C (12.9 F). -20-15-10-501950196019701980Record: -17.8 C (0.0 F) in 1950
The coldest night of the year at Cowichan Lake Forestry, 1949 to 1983. The record is -17.8 C (0.0 F) in 1950, marked on the chart; the median year is -10.6 C (12.9 F).
Coldest night (TNn) at Cowichan Lake Forestry by year
YearColdest night (TNn)
1949-10.0 C (14.0 F)
1950-17.8 C (0.0 F)
1951-12.8 C (9.0 F)
1952-9.4 C (15.1 F)
1953-4.4 C (24.1 F)
1954-12.2 C (10.0 F)
1955-14.4 C (6.1 F)
1956-12.8 C (9.0 F)
1957-15.6 C (3.9 F)
1958-7.2 C (19.0 F)
1959-5.6 C (21.9 F)
1960-7.2 C (19.0 F)
1961-6.7 C (19.9 F)
1962-10.6 C (12.9 F)
1963-10.6 C (12.9 F)
1964-14.4 C (6.1 F)
1965-5.6 C (21.9 F)
1966-6.1 C (21.0 F)
1967-5.0 C (23.0 F)
1968-15.0 C (5.0 F)
1969-16.1 C (3.0 F)
1970-7.2 C (19.0 F)
1971-11.1 C (12.0 F)
1972-12.8 C (9.0 F)
1973-11.1 C (12.0 F)
1974-9.4 C (15.1 F)
1975-8.3 C (17.1 F)
1976-10.0 C (14.0 F)
1977-8.3 C (17.1 F)
1978-13.3 C (8.1 F)
1979-13.0 C (8.6 F)
1980-14.0 C (6.8 F)
1981-6.5 C (20.3 F)
1982-12.5 C (9.5 F)
1983-13.5 C (7.7 F)

Wettest day (Rx1day)

Wettest day (Rx1day) at Cowichan Lake Forestry by year The wettest day of the year at Cowichan Lake Forestry, 1949 to 1983. The record is 145.5 mm (5.7 in) in 1961, marked on the chart; the median year is 88.4 mm (3.5 in). 50751001251501950196019701980Record: 145.5 mm (5.7 in) in 1961
The wettest day of the year at Cowichan Lake Forestry, 1949 to 1983. The record is 145.5 mm (5.7 in) in 1961, marked on the chart; the median year is 88.4 mm (3.5 in).
Wettest day (Rx1day) at Cowichan Lake Forestry by year
YearWettest day (Rx1day)
1949116.1 mm (4.6 in)
195074.7 mm (2.9 in)
195191.9 mm (3.6 in)
195267.3 mm (2.6 in)
1953107.4 mm (4.2 in)
195480.8 mm (3.2 in)
1955100.1 mm (3.9 in)
1956100.8 mm (4.0 in)
195771.9 mm (2.8 in)
195854.1 mm (2.1 in)
195965.5 mm (2.6 in)
196069.1 mm (2.7 in)
1961145.5 mm (5.7 in)
196286.9 mm (3.4 in)
1963112.0 mm (4.4 in)
196493.2 mm (3.7 in)
196576.7 mm (3.0 in)
196675.4 mm (3.0 in)
1967107.4 mm (4.2 in)
1968116.1 mm (4.6 in)
196994.2 mm (3.7 in)
197076.7 mm (3.0 in)
197162.7 mm (2.5 in)
197297.5 mm (3.8 in)
197378.0 mm (3.1 in)
1974135.6 mm (5.3 in)
197588.4 mm (3.5 in)
197664.5 mm (2.5 in)
197776.2 mm (3.0 in)
197855.9 mm (2.2 in)
197990.1 mm (3.5 in)
1980109.2 mm (4.3 in)
198184.2 mm (3.3 in)
198290.4 mm (3.6 in)
1983119.4 mm (4.7 in)

Wettest five days (Rx5day)

Wettest five days (Rx5day) at Cowichan Lake Forestry by year The wettest five days of the year at Cowichan Lake Forestry, 1949 to 1983. The record is 338.5 mm (13.3 in) in 1974, marked on the chart; the median year is 197.8 mm (7.8 in). 1002003004001950196019701980Record: 338.5 mm (13.3 in) in 1974
The wettest five days of the year at Cowichan Lake Forestry, 1949 to 1983. The record is 338.5 mm (13.3 in) in 1974, marked on the chart; the median year is 197.8 mm (7.8 in).
Wettest five days (Rx5day) at Cowichan Lake Forestry by year
YearWettest five days (Rx5day)
1949279.9 mm (11.0 in)
1950174.5 mm (6.9 in)
1951196.3 mm (7.7 in)
1952160.5 mm (6.3 in)
1953249.7 mm (9.8 in)
1954263.6 mm (10.4 in)
1955220.0 mm (8.7 in)
1956158.7 mm (6.2 in)
1957164.9 mm (6.5 in)
1958172.0 mm (6.8 in)
1959158.8 mm (6.3 in)
1960156.2 mm (6.1 in)
1961268.7 mm (10.6 in)
1962149.7 mm (5.9 in)
1963321.5 mm (12.7 in)
1964145.9 mm (5.7 in)
1965172.7 mm (6.8 in)
1966188.3 mm (7.4 in)
1967189.5 mm (7.5 in)
1968268.3 mm (10.6 in)
1969202.1 mm (8.0 in)
1970197.8 mm (7.8 in)
1971151.7 mm (6.0 in)
1972260.8 mm (10.3 in)
1973225.3 mm (8.9 in)
1974338.5 mm (13.3 in)
1975219.0 mm (8.6 in)
1976136.7 mm (5.4 in)
1977178.6 mm (7.0 in)
1978131.4 mm (5.2 in)
1979216.2 mm (8.5 in)
1980261.0 mm (10.3 in)
1981221.7 mm (8.7 in)
1982277.4 mm (10.9 in)
1983301.3 mm (11.9 in)

Longest dry spell (CDD)

Longest dry spell (CDD) at Cowichan Lake Forestry by year The longest dry spell of the year at Cowichan Lake Forestry, 1949 to 1983. The record is 54 days in 1960, marked on the chart; the median year is 26 days. 02040601950196019701980Record: 54 days in 1960
The longest dry spell of the year at Cowichan Lake Forestry, 1949 to 1983. The record is 54 days in 1960, marked on the chart; the median year is 26 days.
Longest dry spell (CDD) at Cowichan Lake Forestry by year
YearLongest dry spell (CDD)
194919 days
195030 days
195143 days
195228 days
195328 days
195427 days
195523 days
195628 days
195719 days
195826 days
195920 days
196054 days
196140 days
196220 days
196327 days
196412 days
196526 days
196618 days
196742 days
196823 days
196931 days
197024 days
197120 days
197232 days
197322 days
197447 days
197516 days
197612 days
197724 days
197827 days
197918 days
198029 days
198143 days
198219 days
198325 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

33 years with a frost

Across 33 years with a frost, the median last spring frost at Cowichan Lake Forestry falls on 28 April and the median first autumn frost on 23 October, which leaves a median of 175 days between them.

Fitted over all years, the growing season changes by +7.5 days per decade at this station.

Frost dates and growing season at Cowichan Lake Forestry
MeasureMedian, all yearsEarliest periodRecent period (1953 to 1983)Recent against earliestFitted trend
Last spring frost28 Apriln/a26 Apriln/a-3.6 days per decade
First autumn frost23 Octobern/a27 Octobern/a+3.9 days per decade
Growing days175 daysn/a177 daysn/a+7.5 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

34 years, 1950 to 1983

A day with at least 85.9 mm (3.4 in) of rain is expected about once in 2 years. A day with at least 154.0 mm (6.1 in) of rain is expected about once in 100 years.

Rainfall return levels at Cowichan Lake Forestry: the daily rain expected about once in a given number of years
Expected about once inA day with at leastNote
2 years85.9 mm (3.4 in)
5 years105.8 mm (4.2 in)
10 years118.3 mm (4.7 in)
25 years133.3 mm (5.2 in)
50 years143.9 mm (5.7 in)Longer than the 34 years of record
100 years154.0 mm (6.1 in)Longer than the 34 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, 34 years of values from 1950 to 1983.

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: 145.5 mm (5.7 in) in 1961; 135.6 mm (5.3 in) in 1974; 119.4 mm (4.7 in) in 1983.

Download the Data

  • Data for Cowichan Lake Forestry standing records by year: CSV or JSON. Field meanings are on the data page.
  • Data for Cowichan Lake Forestry 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 . Last revised (2026-10-17).