Macdiarmid Weather Records (CA006044735)

Record envelope, standing records and threshold days for Macdiarmid (CA006044735), Ontario, Canada, with 45 years of record.

Key Facts for Macdiarmid

Macdiarmid (CA006044735) is a weather station in Ontario, Canada at 49.43 latitude and -88.15 longitude, 312 m (1,024 ft) above sea level.
The station reports from 1926 to 1970, 45 years of record.
1,462 records set at Macdiarmid still stand.
Records are tracked for snow: an element needs 30 years of data to be eligible.
Macdiarmid set a daily record snowfall of 15.2 cm (6.0 in) on 17 February 1970.

About the Station

Location: Ontario, Canada, 49.43 latitude, -88.15 longitude.
Elevation: 312 m (1,024 ft).
Period of record: 1926 to 1970, 45 years.
Eligible elements: 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 Macdiarmid. 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 Macdiarmid, with 2026 drawn through them
Month	Highest record high	Lowest record low	2026 highest maximum	2026 lowest minimum
Jan	4.4 C (39.9 F)	-42.8 C (-45.0 F)	n/a	n/a
Feb	6.1 C (43.0 F)	-43.3 C (-45.9 F)	n/a	n/a
Mar	12.2 C (54.0 F)	-37.2 C (-35.0 F)	n/a	n/a
Apr	25.6 C (78.1 F)	-28.3 C (-18.9 F)	n/a	n/a
May	27.8 C (82.0 F)	-13.3 C (8.1 F)	n/a	n/a
Jun	31.7 C (89.1 F)	-5.0 C (23.0 F)	n/a	n/a
Jul	32.2 C (90.0 F)	0.0 C (32.0 F)	n/a	n/a
Aug	35.6 C (96.1 F)	0.0 C (32.0 F)	n/a	n/a
Sep	27.8 C (82.0 F)	-6.7 C (19.9 F)	n/a	n/a
Oct	23.9 C (75.0 F)	-11.1 C (12.0 F)	n/a	n/a
Nov	15.0 C (59.0 F)	-23.3 C (-9.9 F)	n/a	n/a
Dec	5.0 C (41.0 F)	-33.9 C (-29.0 F)	n/a	n/a

Which Years Hold Standing Records

1,462 standing records

1,462 records at Macdiarmid still stand. 1948 holds the most, with 164.

Standing records at Macdiarmid by the year they were set
Year set	Standing records
1948	164
1949	117
1953	62
1954	39
1955	60
1956	39
1957	18
1958	21
1959	35
1960	46
1961	7
1962	60
1963	38
1964	127
1965	127
1966	96
1967	133
1968	130
1969	117
1970	26

Wettest Day of Each Month

Jul: 76.5 mm (3.0 in)

The wettest day on record for each calendar month at Macdiarmid. The most was 76.5 mm (3.0 in) on 28 July 1944.

Record daily precipitation for each month at Macdiarmid
Month	Record daily precipitation (mm)	Date
Jan	27.9 mm (1.1 in)	24 January 1943
Feb	35.6 mm (1.4 in)	21 February 1937
Mar	20.3 mm (0.8 in)	12 March 1936
Apr	59.7 mm (2.4 in)	26 April 1938
May	43.2 mm (1.7 in)	30 May 1944
Jun	63.5 mm (2.5 in)	6 June 1941
Jul	76.5 mm (3.0 in)	28 July 1944
Aug	74.2 mm (2.9 in)	20 August 1944
Sep	65.8 mm (2.6 in)	22 September 1941
Oct	59.7 mm (2.4 in)	9 October 1948
Nov	66.0 mm (2.6 in)	6 November 1948
Dec	20.3 mm (0.8 in)	8 December 1948

Period of Record Coverage

1948 to 1970

20 years of record at Macdiarmid, 1948 to 1970. 19 years have data for under 90 percent of days and are left out of rankings: 1949, 1953, 1954, 1955, 1956, 1957, 1958, 1959 and others.

Days with data per year at Macdiarmid
Year	Days with data	Share of year	Complete
1948	366	100%	Yes
1949	301	82%	No
1953	199	55%	No
1954	184	50%	No
1955	175	48%	No
1956	153	42%	No
1957	152	42%	No
1958	92	25%	No
1959	170	47%	No
1960	160	44%	No
1961	29	8%	No
1962	181	50%	No
1963	114	31%	No
1964	236	64%	No
1965	298	82%	No
1966	264	72%	No
1967	292	80%	No
1968	309	84%	No
1969	303	83%	No
1970	38	10%	No

Latest Records

Latest records at Macdiarmid
Date	Station	Record	Value	Beat old record by	Old record stood	Significance
17 February 1970	Macdiarmid, CA	daily snowfall	15.2 cm (6.0 in)	5.0 cm (2.0 in)	36 years	22 of 100 (Routine)
1 February 1970	Macdiarmid, CA	daily snowfall	10.2 cm (4.0 in)	2.6 cm (1.0 in)	32 years	17 of 100 (Routine)
22 January 1970	Macdiarmid, CA	daily snowfall	3.8 cm (1.5 in)	1.3 cm (0.5 in)	27 years	14 of 100 (Routine)
15 January 1970	Macdiarmid, CA	daily snowfall	8.9 cm (3.5 in)	6.4 cm (2.5 in)	0 years	18 of 100 (Routine)

Extremes by Year

1926 to 1970

Yearly extremes at Macdiarmid: the record and the median year
Measure	Record	Year of the record	Median year	Years with a value
Hottest day (TXx)	35.6 C (96.1 F)	1949	29.4 C (84.9 F)	20
Coldest night (TNn)	-43.3 C (-45.9 F)	1970	-33.6 C (-28.5 F)	20
Wettest day (Rx1day)	76.5 mm (3.0 in)	1944	35.6 mm (1.4 in)	42
Wettest five days (Rx5day)	116.1 mm (4.6 in)	1944	58.3 mm (2.3 in)	42
Longest dry spell (CDD)	42 days	1939	16 days	42

Hottest day (TXx)

The hottest day of the year at Macdiarmid, 1926 to 1970. The record is 35.6 C (96.1 F) in 1949, marked on the chart; the median year is 29.4 C (84.9 F).

Hottest day (TXx) at Macdiarmid by year
Year	Hottest day (TXx)
1926	n/a
1927	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	30.0 C (86.0 F)
1949	35.6 C (96.1 F)
1952	n/a
1953	27.8 C (82.0 F)
1954	28.9 C (84.0 F)
1955	32.2 C (90.0 F)
1956	30.6 C (87.1 F)
1957	30.0 C (86.0 F)
1958	26.1 C (79.0 F)
1959	29.4 C (84.9 F)
1960	27.2 C (81.0 F)
1961	21.1 C (70.0 F)
1962	26.7 C (80.1 F)
1963	31.7 C (89.1 F)
1964	30.6 C (87.1 F)
1965	29.4 C (84.9 F)
1966	30.6 C (87.1 F)
1967	26.7 C (80.1 F)
1968	25.6 C (78.1 F)
1969	31.7 C (89.1 F)
1970	-2.2 C (28.0 F)

Coldest night (TNn)

The coldest night of the year at Macdiarmid, 1926 to 1970. The record is -43.3 C (-45.9 F) in 1970, marked on the chart; the median year is -33.6 C (-28.5 F).

Coldest night (TNn) at Macdiarmid by year
Year	Coldest night (TNn)
1926	n/a
1927	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	-35.6 C (-32.1 F)
1949	-37.2 C (-35.0 F)
1952	n/a
1953	-12.2 C (10.0 F)
1954	-8.9 C (16.0 F)
1955	-2.8 C (27.0 F)
1956	-7.8 C (18.0 F)
1957	-5.6 C (21.9 F)
1958	-8.9 C (16.0 F)
1959	-6.7 C (19.9 F)
1960	-13.3 C (8.1 F)
1961	-6.7 C (19.9 F)
1962	-36.7 C (-34.1 F)
1963	-35.0 C (-31.0 F)
1964	-32.2 C (-26.0 F)
1965	-37.8 C (-36.0 F)
1966	-36.1 C (-33.0 F)
1967	-39.4 C (-38.9 F)
1968	-42.8 C (-45.0 F)
1969	-40.0 C (-40.0 F)
1970	-43.3 C (-45.9 F)

Wettest day (Rx1day)

The wettest day of the year at Macdiarmid, 1926 to 1970. The record is 76.5 mm (3.0 in) in 1944, marked on the chart; the median year is 35.6 mm (1.4 in).

Wettest day (Rx1day) at Macdiarmid by year
Year	Wettest day (Rx1day)
1926	22.9 mm (0.9 in)
1927	19.6 mm (0.8 in)
1929	38.1 mm (1.5 in)
1930	42.7 mm (1.7 in)
1931	26.9 mm (1.1 in)
1932	37.3 mm (1.5 in)
1933	28.7 mm (1.1 in)
1934	37.1 mm (1.5 in)
1935	42.4 mm (1.7 in)
1936	35.8 mm (1.4 in)
1937	35.6 mm (1.4 in)
1938	59.7 mm (2.4 in)
1939	34.3 mm (1.4 in)
1940	35.1 mm (1.4 in)
1941	65.8 mm (2.6 in)
1942	35.6 mm (1.4 in)
1943	50.8 mm (2.0 in)
1944	76.5 mm (3.0 in)
1945	29.0 mm (1.1 in)
1946	38.1 mm (1.5 in)
1947	33.0 mm (1.3 in)
1948	66.0 mm (2.6 in)
1949	29.2 mm (1.1 in)
1952	38.6 mm (1.5 in)
1953	32.0 mm (1.3 in)
1954	42.4 mm (1.7 in)
1955	41.4 mm (1.6 in)
1956	38.4 mm (1.5 in)
1957	32.5 mm (1.3 in)
1958	22.6 mm (0.9 in)
1959	42.9 mm (1.7 in)
1960	52.6 mm (2.1 in)
1961	16.8 mm (0.7 in)
1962	31.2 mm (1.2 in)
1963	32.5 mm (1.3 in)
1964	59.7 mm (2.4 in)
1965	37.6 mm (1.5 in)
1966	27.9 mm (1.1 in)
1967	29.7 mm (1.2 in)
1968	26.9 mm (1.1 in)
1969	18.3 mm (0.7 in)
1970	15.2 mm (0.6 in)

Wettest five days (Rx5day)

The wettest five days of the year at Macdiarmid, 1926 to 1970. The record is 116.1 mm (4.6 in) in 1944, marked on the chart; the median year is 58.3 mm (2.3 in).

Wettest five days (Rx5day) at Macdiarmid by year
Year	Wettest five days (Rx5day)
1926	37.4 mm (1.5 in)
1927	35.4 mm (1.4 in)
1929	76.7 mm (3.0 in)
1930	63.0 mm (2.5 in)
1931	53.3 mm (2.1 in)
1932	45.7 mm (1.8 in)
1933	41.2 mm (1.6 in)
1934	65.8 mm (2.6 in)
1935	50.8 mm (2.0 in)
1936	36.3 mm (1.4 in)
1937	58.4 mm (2.3 in)
1938	69.1 mm (2.7 in)
1939	73.7 mm (2.9 in)
1940	71.4 mm (2.8 in)
1941	114.8 mm (4.5 in)
1942	69.0 mm (2.7 in)
1943	57.1 mm (2.2 in)
1944	116.1 mm (4.6 in)
1945	64.9 mm (2.6 in)
1946	51.9 mm (2.0 in)
1947	71.4 mm (2.8 in)
1948	104.9 mm (4.1 in)
1949	45.4 mm (1.8 in)
1952	52.0 mm (2.0 in)
1953	46.3 mm (1.8 in)
1954	82.3 mm (3.2 in)
1955	51.0 mm (2.0 in)
1956	58.4 mm (2.3 in)
1957	58.2 mm (2.3 in)
1958	44.9 mm (1.8 in)
1959	63.7 mm (2.5 in)
1960	70.3 mm (2.8 in)
1961	39.4 mm (1.6 in)
1962	43.9 mm (1.7 in)
1963	58.4 mm (2.3 in)
1964	96.3 mm (3.8 in)
1965	54.1 mm (2.1 in)
1966	61.3 mm (2.4 in)
1967	61.4 mm (2.4 in)
1968	41.5 mm (1.6 in)
1969	34.8 mm (1.4 in)
1970	22.0 mm (0.9 in)

Longest dry spell (CDD)

The longest dry spell of the year at Macdiarmid, 1926 to 1970. The record is 42 days in 1939, marked on the chart; the median year is 16 days.

Longest dry spell (CDD) at Macdiarmid by year
Year	Longest dry spell (CDD)
1926	17 days
1927	9 days
1929	10 days
1930	14 days
1931	25 days
1932	30 days
1933	16 days
1934	27 days
1935	16 days
1936	30 days
1937	15 days
1938	31 days
1939	42 days
1940	22 days
1941	19 days
1942	15 days
1943	16 days
1944	25 days
1945	19 days
1946	17 days
1947	34 days
1948	27 days
1949	23 days
1952	5 days
1953	17 days
1954	12 days
1955	9 days
1956	10 days
1957	14 days
1958	8 days
1959	16 days
1960	15 days
1961	9 days
1962	22 days
1963	13 days
1964	13 days
1965	8 days
1966	14 days
1967	19 days
1968	22 days
1969	11 days
1970	11 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 Macdiarmid standing records by year: CSV or JSON. Field meanings are on the data page.
Data for Macdiarmid 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).