Millgrove Weather Records (CA006155183)

Record envelope, standing records and threshold days for Millgrove (CA006155183), Ontario, Canada, with 56 years of record.

Key Facts for Millgrove

Millgrove (CA006155183) is a weather station in Ontario, Canada at 43.32 latitude and -79.97 longitude, 255 m (837 ft) above sea level.
The station reports from 1951 to 2006, 56 years of record.
1,464 records set at Millgrove still stand.
Records are tracked for tmax, tmin, prcp, snow: an element needs 30 years of data to be eligible.
Millgrove set a daily record precipitation of 9.0 mm (0.35 in) on 28 December 1983.

About the Station

Location: Ontario, Canada, 43.32 latitude, -79.97 longitude.
Elevation: 255 m (837 ft).
Period of record: 1951 to 2006, 56 years.
Eligible elements: tmax, tmin, 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 Millgrove. 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 Millgrove, with 2026 drawn through them
Month	Highest record high	Lowest record low	2026 highest maximum	2026 lowest minimum
Jan	12.8 C (55.0 F)	-30.6 C (-23.1 F)	n/a	n/a
Feb	15.0 C (59.0 F)	-27.0 C (-16.6 F)	n/a	n/a
Mar	23.3 C (73.9 F)	-23.3 C (-9.9 F)	n/a	n/a
Apr	30.0 C (86.0 F)	-13.3 C (8.1 F)	n/a	n/a
May	32.2 C (90.0 F)	-5.6 C (21.9 F)	n/a	n/a
Jun	34.4 C (93.9 F)	0.0 C (32.0 F)	n/a	n/a
Jul	36.7 C (98.1 F)	3.9 C (39.0 F)	n/a	n/a
Aug	36.7 C (98.1 F)	1.1 C (34.0 F)	n/a	n/a
Sep	35.6 C (96.1 F)	-3.9 C (25.0 F)	n/a	n/a
Oct	30.6 C (87.1 F)	-10.6 C (12.9 F)	n/a	n/a
Nov	22.8 C (73.0 F)	-17.2 C (1.0 F)	n/a	n/a
Dec	20.5 C (68.9 F)	-28.0 C (-18.4 F)	n/a	n/a

Which Years Hold Standing Records

1,464 standing records

1,464 records at Millgrove still stand. 1965 holds the most, with 68.

Standing records at Millgrove by the year they were set
Year set	Standing records
1951	39
1952	46
1953	50
1954	47
1955	66
1956	54
1957	42
1958	41
1959	63
1960	43
1961	38
1962	44
1963	48
1964	59
1965	68
1966	57
1967	59
1968	47
1969	30
1970	26
1971	39
1972	38
1973	36
1974	36
1975	41
1976	50
1977	38
1978	29
1979	52
1980	27
1981	40
1982	39
1983	32

All-Time Record Progression

1 new records

1 all-time records were set at Millgrove between 15 July 1983 and 15 July 1983. Each dot is a new record.

Wettest Day of Each Month

Sep: 108.0 mm (4.3 in)

The wettest day on record for each calendar month at Millgrove. The most was 108.0 mm (4.3 in) on 17 September 1976.

Record daily precipitation for each month at Millgrove
Month	Record daily precipitation (mm)	Date
Jan	50.8 mm (2.0 in)	5 January 1952
Feb	31.0 mm (1.2 in)	10 February 1981
Mar	50.8 mm (2.0 in)	7 March 1956
Apr	43.9 mm (1.7 in)	28 April 1959
May	55.9 mm (2.2 in)	24 May 1952
Jun	59.9 mm (2.4 in)	10 June 1967
Jul	76.2 mm (3.0 in)	12 July 1964
Aug	80.0 mm (3.1 in)	5 August 1968
Sep	108.0 mm (4.3 in)	17 September 1976
Oct	97.8 mm (3.9 in)	15 October 1954
Nov	50.8 mm (2.0 in)	9 November 1962
Dec	31.2 mm (1.2 in)	22 December 1968

Period of Record Coverage

1951 to 1983

33 years of record at Millgrove, 1951 to 1983. 12 years have data for under 90 percent of days and are left out of rankings: 1951, 1952, 1953, 1957, 1962, 1963, 1974, 1975 and others.

Days with data per year at Millgrove
Year	Days with data	Share of year	Complete
1951	224	61%	No
1952	298	81%	No
1953	295	81%	No
1954	352	96%	Yes
1955	360	99%	Yes
1956	366	100%	Yes
1957	294	81%	No
1958	361	99%	Yes
1959	345	95%	Yes
1960	343	94%	Yes
1961	344	94%	Yes
1962	324	89%	No
1963	290	79%	No
1964	364	99%	Yes
1965	361	99%	Yes
1966	356	98%	Yes
1967	360	99%	Yes
1968	359	98%	Yes
1969	365	100%	Yes
1970	333	91%	Yes
1971	365	100%	Yes
1972	364	99%	Yes
1973	346	95%	Yes
1974	325	89%	No
1975	321	88%	No
1976	339	93%	Yes
1977	329	90%	Yes
1978	321	88%	No
1979	313	86%	No
1980	300	82%	No
1981	339	93%	Yes
1982	341	93%	Yes
1983	266	73%	No

Latest Records

Latest records at Millgrove
Date	Station	Record	Value	Beat old record by	Old record stood	Significance
28 December 1983	Millgrove, CA	daily rain	9.0 mm (0.35 in)	1.4 mm (0.06 in)	16 years	10 of 100 (Routine)
28 December 1983	Millgrove, CA	daily snowfall	9.0 cm (3.5 in)	1.4 cm (0.6 in)	16 years	10 of 100 (Routine)
25 December 1983	Millgrove, CA	daily low max	-12.5 C (9.5 F)	1.9 C (3.4 F)	14 years	10 of 100 (Routine)
24 December 1983	Millgrove, CA	daily low max	-13.5 C (7.7 F)	4.1 C (7.4 F)	24 years	17 of 100 (Routine)
24 December 1983	Millgrove, CA	daily snowfall	4.2 cm (1.7 in)	1.7 cm (0.7 in)	16 years	11 of 100 (Routine)
19 December 1983	Millgrove, CA	daily low max (Tie)	-10.0 C (14.0 F)	tie	2 years	0 of 100 (Routine)
16 November 1983	Millgrove, CA	monthly snowfall	16.8 cm (6.6 in)	2.8 cm (1.1 in)	11 years	23 of 100 (Routine)
14 November 1983	Millgrove, CA	daily low min	-7.0 C (19.4 F)	0.3 C (0.5 F)	25 years	10 of 100 (Routine)
13 November 1983	Millgrove, CA	daily low max	-2.0 C (28.4 F)	2.6 C (4.7 F)	14 years	11 of 100 (Routine)
13 November 1983	Millgrove, CA	daily low min	-8.0 C (17.6 F)	0.8 C (1.4 F)	5 years	5 of 100 (Routine)
11 November 1983	Millgrove, CA	daily snowfall	8.2 cm (3.2 in)	8.2 cm (3.2 in)	32 years	34 of 100 (Routine)
11 November 1983	Millgrove, CA	daily rain	12.2 mm (0.5 in)	1.8 mm (0.07 in)	12 years	8 of 100 (Routine)
9 November 1983	Millgrove, CA	daily high max	17.5 C (63.5 F)	0.3 C (0.5 F)	8 years	5 of 100 (Routine)
6 August 1983	Millgrove, CA	daily high min (Tie)	20.0 C (68.0 F)	tie	28 years	2 of 100 (Routine)
31 July 1983	Millgrove, CA	daily high min	21.0 C (69.8 F)	1.5 C (2.7 F)	4 years	7 of 100 (Routine)
30 July 1983	Millgrove, CA	daily high min	21.5 C (70.7 F)	2.1 C (3.8 F)	25 years	15 of 100 (Routine)
29 July 1983	Millgrove, CA	daily high min	21.5 C (70.7 F)	0.4 C (0.7 F)	18 years	9 of 100 (Routine)
16 July 1983	Millgrove, CA	daily high min	22.5 C (72.5 F)	1.9 C (3.4 F)	14 years	12 of 100 (Routine)
15 July 1983	Millgrove, CA	all-time high min	24.0 C (75.2 F)	0.7 C (1.3 F)	10 years	27 of 100 (Routine)
15 July 1983	Millgrove, CA	daily high max	34.0 C (93.2 F)	1.2 C (2.2 F)	5 years	7 of 100 (Routine)

Climate Trend

16 complete years, 1954 to 1982

One stripe for each of 16 complete years at Millgrove, 1954 to 1982. Blue stripes are years cooler than the station's own mean of 7.2 C (44.9 F); red stripes are warmer. The coolest year was 1965, at 6.5 C (43.8 F), and the warmest was 1955, at 8.1 C (46.5 F). The strongest colour marks a difference of 1.0 C (1.8 F).

Annual mean temperature at Millgrove as warming stripes, 1954 to 1982
Year	Annual mean temperature	Difference from the station mean
1954	7.4 C	+0.22 C
1955	8.1 C	+0.91 C
1956	7.1 C	-0.05 C
1958	6.6 C	-0.53 C
1960	6.9 C	-0.30 C
1961	7.4 C	+0.21 C
1964	7.3 C	+0.15 C
1965	6.5 C	-0.63 C
1966	6.9 C	-0.23 C
1967	6.6 C	-0.59 C
1968	6.9 C	-0.24 C
1969	7.4 C	+0.22 C
1971	7.6 C	+0.41 C
1972	6.6 C	-0.57 C
1981	7.8 C	+0.67 C
1982	7.5 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

1951 to 1983

Yearly extremes at Millgrove: the record and the median year
Measure	Record	Year of the record	Median year	Years with a value
Hottest day (TXx)	36.7 C (98.1 F)	1955	32.2 C (90.0 F)	33
Coldest night (TNn)	-30.6 C (-23.1 F)	1976	-24.4 C (-11.9 F)	33
Wettest day (Rx1day)	108.0 mm (4.3 in)	1976	50.5 mm (2.0 in)	33
Wettest five days (Rx5day)	129.5 mm (5.1 in)	1954	76.6 mm (3.0 in)	33
Longest dry spell (CDD)	39 days	1956	19 days	33

Hottest day (TXx)

The hottest day of the year at Millgrove, 1951 to 1983. The record is 36.7 C (98.1 F) in 1955, marked on the chart; the median year is 32.2 C (90.0 F).

Hottest day (TXx) at Millgrove by year
Year	Hottest day (TXx)
1951	31.7 C (89.1 F)
1952	35.6 C (96.1 F)
1953	35.6 C (96.1 F)
1954	33.3 C (91.9 F)
1955	36.7 C (98.1 F)
1956	32.2 C (90.0 F)
1957	35.6 C (96.1 F)
1958	31.7 C (89.1 F)
1959	35.0 C (95.0 F)
1960	31.7 C (89.1 F)
1961	32.2 C (90.0 F)
1962	32.2 C (90.0 F)
1963	31.7 C (89.1 F)
1964	32.2 C (90.0 F)
1965	32.2 C (90.0 F)
1966	34.4 C (93.9 F)
1967	31.1 C (88.0 F)
1968	32.2 C (90.0 F)
1969	32.2 C (90.0 F)
1970	29.4 C (84.9 F)
1971	32.2 C (90.0 F)
1972	32.2 C (90.0 F)
1973	35.0 C (95.0 F)
1974	32.2 C (90.0 F)
1975	34.4 C (93.9 F)
1976	30.6 C (87.1 F)
1977	32.8 C (91.0 F)
1978	33.5 C (92.3 F)
1979	31.5 C (88.7 F)
1980	31.5 C (88.7 F)
1981	33.0 C (91.4 F)
1982	30.5 C (86.9 F)
1983	34.0 C (93.2 F)

Coldest night (TNn)

The coldest night of the year at Millgrove, 1951 to 1983. The record is -30.6 C (-23.1 F) in 1976, marked on the chart; the median year is -24.4 C (-11.9 F).

Coldest night (TNn) at Millgrove by year
Year	Coldest night (TNn)
1951	-22.2 C (-8.0 F)
1952	-22.8 C (-9.0 F)
1953	-23.3 C (-9.9 F)
1954	-24.4 C (-11.9 F)
1955	-26.7 C (-16.1 F)
1956	-18.3 C (-0.9 F)
1957	-26.1 C (-15.0 F)
1958	-22.8 C (-9.0 F)
1959	-22.8 C (-9.0 F)
1960	-20.0 C (-4.0 F)
1961	-25.0 C (-13.0 F)
1962	-26.1 C (-15.0 F)
1963	-25.6 C (-14.1 F)
1964	-21.7 C (-7.1 F)
1965	-27.2 C (-17.0 F)
1966	-22.8 C (-9.0 F)
1967	-24.4 C (-11.9 F)
1968	-23.9 C (-11.0 F)
1969	-20.6 C (-5.1 F)
1970	-25.0 C (-13.0 F)
1971	-24.4 C (-11.9 F)
1972	-22.2 C (-8.0 F)
1973	-24.4 C (-11.9 F)
1974	-21.1 C (-6.0 F)
1975	-21.7 C (-7.1 F)
1976	-30.6 C (-23.1 F)
1977	-27.8 C (-18.0 F)
1978	-22.2 C (-8.0 F)
1979	-27.0 C (-16.6 F)
1980	-28.0 C (-18.4 F)
1981	-26.5 C (-15.7 F)
1982	-24.5 C (-12.1 F)
1983	-20.0 C (-4.0 F)

Wettest day (Rx1day)

The wettest day of the year at Millgrove, 1951 to 1983. The record is 108.0 mm (4.3 in) in 1976, marked on the chart; the median year is 50.5 mm (2.0 in).

Wettest day (Rx1day) at Millgrove by year
Year	Wettest day (Rx1day)
1951	44.5 mm (1.8 in)
1952	55.9 mm (2.2 in)
1953	40.1 mm (1.6 in)
1954	97.8 mm (3.9 in)
1955	52.1 mm (2.1 in)
1956	59.2 mm (2.3 in)
1957	47.5 mm (1.9 in)
1958	63.5 mm (2.5 in)
1959	71.6 mm (2.8 in)
1960	41.9 mm (1.6 in)
1961	66.0 mm (2.6 in)
1962	50.8 mm (2.0 in)
1963	20.8 mm (0.8 in)
1964	76.2 mm (3.0 in)
1965	43.7 mm (1.7 in)
1966	39.9 mm (1.6 in)
1967	59.9 mm (2.4 in)
1968	80.0 mm (3.1 in)
1969	50.8 mm (2.0 in)
1970	27.7 mm (1.1 in)
1971	41.1 mm (1.6 in)
1972	50.8 mm (2.0 in)
1973	51.1 mm (2.0 in)
1974	32.3 mm (1.3 in)
1975	43.7 mm (1.7 in)
1976	108.0 mm (4.3 in)
1977	50.5 mm (2.0 in)
1978	48.8 mm (1.9 in)
1979	30.6 mm (1.2 in)
1980	29.1 mm (1.1 in)
1981	44.0 mm (1.7 in)
1982	72.0 mm (2.8 in)
1983	40.8 mm (1.6 in)

Wettest five days (Rx5day)

The wettest five days of the year at Millgrove, 1951 to 1983. The record is 129.5 mm (5.1 in) in 1954, marked on the chart; the median year is 76.6 mm (3.0 in).

Wettest five days (Rx5day) at Millgrove by year
Year	Wettest five days (Rx5day)
1951	76.2 mm (3.0 in)
1952	71.6 mm (2.8 in)
1953	45.2 mm (1.8 in)
1954	129.5 mm (5.1 in)
1955	57.2 mm (2.3 in)
1956	107.4 mm (4.2 in)
1957	83.8 mm (3.3 in)
1958	94.0 mm (3.7 in)
1959	82.2 mm (3.2 in)
1960	70.2 mm (2.8 in)
1961	88.9 mm (3.5 in)
1962	72.4 mm (2.9 in)
1963	47.7 mm (1.9 in)
1964	98.3 mm (3.9 in)
1965	64.0 mm (2.5 in)
1966	75.8 mm (3.0 in)
1967	77.4 mm (3.0 in)
1968	85.9 mm (3.4 in)
1969	78.7 mm (3.1 in)
1970	44.0 mm (1.7 in)
1971	78.2 mm (3.1 in)
1972	89.3 mm (3.5 in)
1973	108.7 mm (4.3 in)
1974	72.5 mm (2.9 in)
1975	56.1 mm (2.2 in)
1976	120.7 mm (4.8 in)
1977	70.6 mm (2.8 in)
1978	106.3 mm (4.2 in)
1979	60.8 mm (2.4 in)
1980	41.9 mm (1.6 in)
1981	112.4 mm (4.4 in)
1982	76.6 mm (3.0 in)
1983	56.0 mm (2.2 in)

Longest dry spell (CDD)

The longest dry spell of the year at Millgrove, 1951 to 1983. The record is 39 days in 1956, marked on the chart; the median year is 19 days.

Longest dry spell (CDD) at Millgrove by year
Year	Longest dry spell (CDD)
1951	15 days
1952	18 days
1953	27 days
1954	18 days
1955	19 days
1956	39 days
1957	16 days
1958	20 days
1959	19 days
1960	20 days
1961	29 days
1962	12 days
1963	19 days
1964	20 days
1965	21 days
1966	21 days
1967	20 days
1968	19 days
1969	23 days
1970	15 days
1971	16 days
1972	17 days
1973	27 days
1974	12 days
1975	18 days
1976	25 days
1977	19 days
1978	19 days
1979	27 days
1980	13 days
1981	15 days
1982	16 days
1983	19 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 Millgrove standing records by year: CSV or JSON. Field meanings are on the data page.
Data for Millgrove 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 2026-10-17. Last revised 17 October 2026 (2026-10-17).