Copper Lake Weather Records (CA008201100)

Record envelope, standing records and threshold days for Copper Lake (CA008201100), Nova Scotia, Canada, with 30 years of record.

Key Facts for Copper Lake

Copper Lake (CA008201100) is a weather station in Nova Scotia, Canada at 45.38 latitude and -61.97 longitude, 97 m (318 ft) above sea level.
The station reports from 1945 to 1974, 30 years of record.
1,464 records set at Copper Lake still stand.
Records are tracked for no element yet: an element needs 30 years of data to be eligible.

About the Station

Location: Nova Scotia, Canada, 45.38 latitude, -61.97 longitude.
Elevation: 97 m (318 ft).
Period of record: 1945 to 1974, 30 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 Copper Lake. 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 Copper Lake, with 2026 drawn through them
Month	Highest record high	Lowest record low	2026 highest maximum	2026 lowest minimum
Jan	13.3 C (55.9 F)	-31.7 C (-25.1 F)	n/a	n/a
Feb	12.8 C (55.0 F)	-32.8 C (-27.0 F)	n/a	n/a
Mar	15.6 C (60.1 F)	-28.3 C (-18.9 F)	n/a	n/a
Apr	23.9 C (75.0 F)	-15.0 C (5.0 F)	n/a	n/a
May	31.7 C (89.1 F)	-6.7 C (19.9 F)	n/a	n/a
Jun	32.8 C (91.0 F)	-2.8 C (27.0 F)	n/a	n/a
Jul	33.3 C (91.9 F)	0.6 C (33.1 F)	n/a	n/a
Aug	34.4 C (93.9 F)	1.7 C (35.1 F)	n/a	n/a
Sep	32.8 C (91.0 F)	-3.3 C (26.1 F)	n/a	n/a
Oct	26.7 C (80.1 F)	-7.2 C (19.0 F)	n/a	n/a
Nov	21.7 C (71.1 F)	-13.9 C (7.0 F)	n/a	n/a
Dec	16.1 C (61.0 F)	-28.3 C (-18.9 F)	n/a	n/a

Which Years Hold Standing Records

1,464 standing records

1,464 records at Copper Lake still stand. 1947 holds the most, with 72.

Standing records at Copper Lake by the year they were set
Year set	Standing records
1945	18
1946	63
1947	72
1948	52
1949	55
1950	72
1951	72
1952	35
1953	61
1954	46
1955	56
1956	65
1957	68
1958	41
1959	55
1960	35
1961	47
1962	30
1963	30
1964	32
1965	37
1966	30
1967	65
1968	47
1969	49
1970	46
1971	44
1972	62
1973	57
1974	22

Wettest Day of Each Month

Aug: 164.3 mm (6.5 in)

The wettest day on record for each calendar month at Copper Lake. The most was 164.3 mm (6.5 in) on 15 August 1971.

Record daily precipitation for each month at Copper Lake
Month	Record daily precipitation (mm)	Date
Jan	108.7 mm (4.3 in)	6 January 1956
Feb	63.5 mm (2.5 in)	14 February 1971
Mar	70.1 mm (2.8 in)	1 March 1965
Apr	51.1 mm (2.0 in)	3 April 1970
May	66.3 mm (2.6 in)	29 May 1948
Jun	57.2 mm (2.3 in)	14 June 1965
Jul	66.0 mm (2.6 in)	29 July 1958
Aug	164.3 mm (6.5 in)	15 August 1971
Sep	69.6 mm (2.7 in)	30 September 1963
Oct	74.9 mm (2.9 in)	10 October 1967
Nov	82.8 mm (3.3 in)	9 November 1969
Dec	64.3 mm (2.5 in)	29 December 1961

Period of Record Coverage

1945 to 1974

30 years of record at Copper Lake, 1945 to 1974. 7 years have data for under 90 percent of days and are left out of rankings: 1945, 1962, 1963, 1964, 1965, 1966, 1974.

Days with data per year at Copper Lake
Year	Days with data	Share of year	Complete
1945	100	27%	No
1946	365	100%	Yes
1947	365	100%	Yes
1948	366	100%	Yes
1949	365	100%	Yes
1950	365	100%	Yes
1951	365	100%	Yes
1952	366	100%	Yes
1953	365	100%	Yes
1954	365	100%	Yes
1955	365	100%	Yes
1956	366	100%	Yes
1957	365	100%	Yes
1958	365	100%	Yes
1959	365	100%	Yes
1960	366	100%	Yes
1961	365	100%	Yes
1962	312	85%	No
1963	261	72%	No
1964	260	71%	No
1965	261	72%	No
1966	270	74%	No
1967	364	100%	Yes
1968	366	100%	Yes
1969	365	100%	Yes
1970	365	100%	Yes
1971	365	100%	Yes
1972	363	99%	Yes
1973	362	99%	Yes
1974	165	45%	No

Latest Records

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

Climate Trend

27 complete years, 1946 to 1973

One stripe for each of 27 complete years at Copper Lake, 1946 to 1973. Blue stripes are years cooler than the station's own mean of 5.6 C (42.0 F); red stripes are warmer. The coolest year was 1965, at 4.5 C (40.1 F), and the warmest was 1951, at 6.9 C (44.4 F). The strongest colour marks a difference of 1.4 C (2.5 F).

Annual mean temperature at Copper Lake as warming stripes, 1946 to 1973
Year	Annual mean temperature	Difference from the station mean
1946	5.6 C	+0.01 C
1947	5.7 C	+0.10 C
1948	4.6 C	-0.95 C
1949	6.2 C	+0.60 C
1950	5.3 C	-0.28 C
1951	6.9 C	+1.34 C
1952	6.2 C	+0.65 C
1953	6.9 C	+1.29 C
1954	6.2 C	+0.64 C
1955	5.2 C	-0.33 C
1956	5.0 C	-0.55 C
1957	5.4 C	-0.18 C
1958	5.8 C	+0.21 C
1959	5.4 C	-0.13 C
1960	6.4 C	+0.81 C
1961	5.4 C	-0.14 C
1962	4.8 C	-0.76 C
1963	5.2 C	-0.38 C
1964	4.5 C	-1.04 C
1965	4.5 C	-1.08 C
1967	5.5 C	-0.04 C
1968	5.5 C	-0.07 C
1969	6.6 C	+1.07 C
1970	5.2 C	-0.36 C
1971	5.7 C	+0.10 C
1972	4.6 C	-0.96 C
1973	5.9 C	+0.34 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

1945 to 1974

Yearly extremes at Copper Lake: 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)	1947	31.7 C (89.1 F)	30
Coldest night (TNn)	-32.8 C (-27.0 F)	1961	-27.2 C (-17.0 F)	30
Wettest day (Rx1day)	164.3 mm (6.5 in)	1971	65.2 mm (2.6 in)	30
Wettest five days (Rx5day)	260.6 mm (10.3 in)	1971	94.2 mm (3.7 in)	30
Longest dry spell (CDD)	31 days	1960	11 days	30

Hottest day (TXx)

The hottest day of the year at Copper Lake, 1945 to 1974. The record is 34.4 C (93.9 F) in 1947, marked on the chart; the median year is 31.7 C (89.1 F).

Hottest day (TXx) at Copper Lake by year
Year	Hottest day (TXx)
1945	21.7 C (71.1 F)
1946	32.2 C (90.0 F)
1947	34.4 C (93.9 F)
1948	31.7 C (89.1 F)
1949	32.8 C (91.0 F)
1950	28.9 C (84.0 F)
1951	29.4 C (84.9 F)
1952	32.8 C (91.0 F)
1953	30.0 C (86.0 F)
1954	30.6 C (87.1 F)
1955	31.7 C (89.1 F)
1956	27.8 C (82.0 F)
1957	30.0 C (86.0 F)
1958	27.8 C (82.0 F)
1959	32.2 C (90.0 F)
1960	32.8 C (91.0 F)
1961	31.1 C (88.0 F)
1962	32.2 C (90.0 F)
1963	33.3 C (91.9 F)
1964	30.0 C (86.0 F)
1965	31.7 C (89.1 F)
1966	31.7 C (89.1 F)
1967	32.8 C (91.0 F)
1968	31.1 C (88.0 F)
1969	32.8 C (91.0 F)
1970	31.7 C (89.1 F)
1971	31.1 C (88.0 F)
1972	31.7 C (89.1 F)
1973	31.7 C (89.1 F)
1974	27.8 C (82.0 F)

Coldest night (TNn)

The coldest night of the year at Copper Lake, 1945 to 1974. The record is -32.8 C (-27.0 F) in 1961, marked on the chart; the median year is -27.2 C (-17.0 F).

Coldest night (TNn) at Copper Lake by year
Year	Coldest night (TNn)
1945	-22.8 C (-9.0 F)
1946	-27.2 C (-17.0 F)
1947	-25.6 C (-14.1 F)
1948	-31.7 C (-25.1 F)
1949	-27.2 C (-17.0 F)
1950	-28.9 C (-20.0 F)
1951	-27.2 C (-17.0 F)
1952	-28.3 C (-18.9 F)
1953	-17.8 C (0.0 F)
1954	-27.8 C (-18.0 F)
1955	-32.2 C (-26.0 F)
1956	-25.0 C (-13.0 F)
1957	-31.7 C (-25.1 F)
1958	-26.7 C (-16.1 F)
1959	-25.0 C (-13.0 F)
1960	-25.0 C (-13.0 F)
1961	-32.8 C (-27.0 F)
1962	-25.0 C (-13.0 F)
1963	-26.1 C (-15.0 F)
1964	-26.7 C (-16.1 F)
1965	-28.3 C (-18.9 F)
1966	-31.7 C (-25.1 F)
1967	-30.6 C (-23.1 F)
1968	-28.9 C (-20.0 F)
1969	-22.2 C (-8.0 F)
1970	-26.1 C (-15.0 F)
1971	-30.6 C (-23.1 F)
1972	-29.4 C (-20.9 F)
1973	-27.2 C (-17.0 F)
1974	-25.6 C (-14.1 F)

Wettest day (Rx1day)

The wettest day of the year at Copper Lake, 1945 to 1974. The record is 164.3 mm (6.5 in) in 1971, marked on the chart; the median year is 65.2 mm (2.6 in).

Wettest day (Rx1day) at Copper Lake by year
Year	Wettest day (Rx1day)
1945	64.0 mm (2.5 in)
1946	56.6 mm (2.2 in)
1947	61.5 mm (2.4 in)
1948	66.3 mm (2.6 in)
1949	75.7 mm (3.0 in)
1950	71.9 mm (2.8 in)
1951	52.8 mm (2.1 in)
1952	64.3 mm (2.5 in)
1953	74.9 mm (2.9 in)
1954	59.9 mm (2.4 in)
1955	63.2 mm (2.5 in)
1956	108.7 mm (4.3 in)
1957	38.9 mm (1.5 in)
1958	66.0 mm (2.6 in)
1959	72.1 mm (2.8 in)
1960	46.7 mm (1.8 in)
1961	64.3 mm (2.5 in)
1962	62.2 mm (2.4 in)
1963	74.9 mm (2.9 in)
1964	68.6 mm (2.7 in)
1965	70.1 mm (2.8 in)
1966	36.3 mm (1.4 in)
1967	74.9 mm (2.9 in)
1968	136.4 mm (5.4 in)
1969	82.8 mm (3.3 in)
1970	80.3 mm (3.2 in)
1971	164.3 mm (6.5 in)
1972	55.6 mm (2.2 in)
1973	42.2 mm (1.7 in)
1974	38.9 mm (1.5 in)

Wettest five days (Rx5day)

The wettest five days of the year at Copper Lake, 1945 to 1974. The record is 260.6 mm (10.3 in) in 1971, marked on the chart; the median year is 94.2 mm (3.7 in).

Wettest five days (Rx5day) at Copper Lake by year
Year	Wettest five days (Rx5day)
1945	98.0 mm (3.9 in)
1946	74.3 mm (2.9 in)
1947	89.6 mm (3.5 in)
1948	112.0 mm (4.4 in)
1949	85.3 mm (3.4 in)
1950	111.8 mm (4.4 in)
1951	93.8 mm (3.7 in)
1952	93.3 mm (3.7 in)
1953	81.7 mm (3.2 in)
1954	128.5 mm (5.1 in)
1955	76.9 mm (3.0 in)
1956	163.6 mm (6.4 in)
1957	94.5 mm (3.7 in)
1958	109.0 mm (4.3 in)
1959	92.1 mm (3.6 in)
1960	88.7 mm (3.5 in)
1961	98.7 mm (3.9 in)
1962	122.2 mm (4.8 in)
1963	77.4 mm (3.0 in)
1964	95.0 mm (3.7 in)
1965	95.3 mm (3.8 in)
1966	56.1 mm (2.2 in)
1967	118.3 mm (4.7 in)
1968	164.6 mm (6.5 in)
1969	176.2 mm (6.9 in)
1970	84.3 mm (3.3 in)
1971	260.6 mm (10.3 in)
1972	82.9 mm (3.3 in)
1973	76.2 mm (3.0 in)
1974	80.2 mm (3.2 in)

Longest dry spell (CDD)

The longest dry spell of the year at Copper Lake, 1945 to 1974. The record is 31 days in 1960, marked on the chart; the median year is 11 days.

Longest dry spell (CDD) at Copper Lake by year
Year	Longest dry spell (CDD)
1945	7 days
1946	15 days
1947	18 days
1948	8 days
1949	11 days
1950	16 days
1951	11 days
1952	11 days
1953	13 days
1954	18 days
1955	13 days
1956	15 days
1957	9 days
1958	10 days
1959	11 days
1960	31 days
1961	15 days
1962	12 days
1963	5 days
1964	5 days
1965	5 days
1966	5 days
1967	12 days
1968	11 days
1969	22 days
1970	15 days
1971	14 days
1972	10 days
1973	11 days
1974	10 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

27 years with a frost

Across 27 years with a frost, the median last spring frost at Copper Lake falls on 10 June and the median first autumn frost on 18 September, which leaves a median of 112 days between them.

Fitted over all years, the growing season changes by +2.9 days per decade at this station.

Frost dates and growing season at Copper Lake
Measure	Median, all years	Earliest period	Recent period (1946 to 1973)	Recent against earliest	Fitted trend
Last spring frost	10 June	n/a	10 June	n/a	-0.4 days per decade
First autumn frost	18 September	n/a	18 September	n/a	+2.5 days per decade
Growing days	112 days	n/a	112 days	n/a	+2.9 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.

Download the Data

Data for Copper Lake standing records by year: CSV or JSON. Field meanings are on the data page.
Data for Copper Lake 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 2026-10-13 (13 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).