Monticello Weather Records (CA006145267)

Record envelope, standing records and threshold days for Monticello (CA006145267), Ontario, Canada, with 42 years of record.

Key Facts for Monticello

Monticello (CA006145267) is a weather station in Ontario, Canada at 43.97 latitude and -80.40 longitude, 482 m (1,581 ft) above sea level.
The station reports from 1954 to 1995, 42 years of record.
1,464 records set at Monticello still stand.
Records are tracked for no element yet: an element needs 30 years of data to be eligible.

About the Station

Location: Ontario, Canada, 43.97 latitude, -80.40 longitude.
Elevation: 482 m (1,581 ft).
Period of record: 1954 to 1995, 42 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 Monticello. 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 Monticello, with 2026 drawn through them
Month	Highest record high	Lowest record low	2026 highest maximum	2026 lowest minimum
Jan	10.0 C (50.0 F)	-35.6 C (-32.1 F)	n/a	n/a
Feb	8.0 C (46.4 F)	-34.5 C (-30.1 F)	n/a	n/a
Mar	15.6 C (60.1 F)	-30.5 C (-22.9 F)	n/a	n/a
Apr	25.6 C (78.1 F)	-21.7 C (-7.1 F)	n/a	n/a
May	29.4 C (84.9 F)	-6.7 C (19.9 F)	n/a	n/a
Jun	31.1 C (88.0 F)	-1.1 C (30.0 F)	n/a	n/a
Jul	34.4 C (93.9 F)	2.2 C (36.0 F)	n/a	n/a
Aug	35.6 C (96.1 F)	-0.6 C (30.9 F)	n/a	n/a
Sep	32.2 C (90.0 F)	-4.4 C (24.1 F)	n/a	n/a
Oct	26.7 C (80.1 F)	-12.2 C (10.0 F)	n/a	n/a
Nov	20.6 C (69.1 F)	-17.8 C (0.0 F)	n/a	n/a
Dec	15.5 C (59.9 F)	-31.7 C (-25.1 F)	n/a	n/a

Which Years Hold Standing Records

1,464 standing records

1,464 records at Monticello still stand. 1955 holds the most, with 82.

Standing records at Monticello by the year they were set
Year set	Standing records
1954	8
1955	82
1956	45
1957	52
1958	29
1959	69
1960	59
1961	60
1962	54
1963	53
1964	48
1965	64
1966	62
1967	56
1968	52
1969	29
1970	40
1971	39
1972	46
1973	50
1974	45
1975	47
1976	55
1977	53
1978	36
1979	55
1980	38
1981	47
1982	41
1983	50

Wettest Day of Each Month

Oct: 84.6 mm (3.3 in)

The wettest day on record for each calendar month at Monticello. The most was 84.6 mm (3.3 in) on 15 October 1954.

Record daily precipitation for each month at Monticello
Month	Record daily precipitation (mm)	Date
Jan	32.5 mm (1.3 in)	1 January 1955
Feb	45.4 mm (1.8 in)	10 February 1981
Mar	37.8 mm (1.5 in)	4 March 1974
Apr	38.1 mm (1.5 in)	28 April 1956
May	41.8 mm (1.6 in)	10 May 1981
Jun	48.0 mm (1.9 in)	28 June 1977
Jul	48.3 mm (1.9 in)	1 July 1956
Aug	72.9 mm (2.9 in)	22 August 1968
Sep	53.8 mm (2.1 in)	17 September 1976
Oct	84.6 mm (3.3 in)	15 October 1954
Nov	37.1 mm (1.5 in)	28 November 1968
Dec	35.6 mm (1.4 in)	4 December 1961

Period of Record Coverage

1954 to 1983

30 years of record at Monticello, 1954 to 1983. 4 years have data for under 90 percent of days and are left out of rankings: 1954, 1955, 1957, 1958.

Days with data per year at Monticello
Year	Days with data	Share of year	Complete
1954	92	25%	No
1955	305	84%	No
1956	346	95%	Yes
1957	271	74%	No
1958	243	67%	No
1959	364	100%	Yes
1960	366	100%	Yes
1961	363	99%	Yes
1962	365	100%	Yes
1963	335	92%	Yes
1964	366	100%	Yes
1965	364	100%	Yes
1966	365	100%	Yes
1967	365	100%	Yes
1968	366	100%	Yes
1969	365	100%	Yes
1970	365	100%	Yes
1971	365	100%	Yes
1972	366	100%	Yes
1973	365	100%	Yes
1974	365	100%	Yes
1975	364	100%	Yes
1976	366	100%	Yes
1977	364	100%	Yes
1978	365	100%	Yes
1979	339	93%	Yes
1980	366	100%	Yes
1981	365	100%	Yes
1982	363	99%	Yes
1983	365	100%	Yes

Latest Records

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

Climate Trend

23 complete years, 1959 to 1983

One stripe for each of 23 complete years at Monticello, 1959 to 1983. Blue stripes are years cooler than the station's own mean of 4.9 C (40.8 F); red stripes are warmer. The coolest year was 1972, at 4.0 C (39.2 F), and the warmest was 1973, at 6.1 C (42.9 F). The strongest colour marks a difference of 1.2 C (2.2 F).

Annual mean temperature at Monticello as warming stripes, 1959 to 1983
Year	Annual mean temperature	Difference from the station mean
1959	5.2 C	+0.31 C
1960	4.4 C	-0.47 C
1961	5.3 C	+0.42 C
1962	4.7 C	-0.26 C
1964	5.2 C	+0.33 C
1965	4.5 C	-0.41 C
1966	5.0 C	+0.06 C
1967	4.6 C	-0.33 C
1968	5.1 C	+0.21 C
1969	5.0 C	+0.07 C
1970	4.7 C	-0.21 C
1971	5.2 C	+0.25 C
1972	4.0 C	-0.91 C
1973	6.1 C	+1.17 C
1974	4.6 C	-0.27 C
1975	5.3 C	+0.41 C
1976	4.4 C	-0.56 C
1977	5.2 C	+0.26 C
1978	4.1 C	-0.78 C
1980	4.6 C	-0.36 C
1981	5.1 C	+0.21 C
1982	5.0 C	+0.12 C
1983	5.7 C	+0.82 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

1954 to 1983

Yearly extremes at Monticello: 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)	1955	29.8 C (85.6 F)	30
Coldest night (TNn)	-35.6 C (-32.1 F)	1977	-28.9 C (-20.0 F)	30
Wettest day (Rx1day)	84.6 mm (3.3 in)	1954	39.6 mm (1.6 in)	30
Wettest five days (Rx5day)	142.9 mm (5.6 in)	1954	63.4 mm (2.5 in)	30
Longest dry spell (CDD)	32 days	1979	14 days	30

Hottest day (TXx)

The hottest day of the year at Monticello, 1954 to 1983. The record is 35.6 C (96.1 F) in 1955, marked on the chart; the median year is 29.8 C (85.6 F).

Hottest day (TXx) at Monticello by year
Year	Hottest day (TXx)
1954	22.8 C (73.0 F)
1955	35.6 C (96.1 F)
1956	29.4 C (84.9 F)
1957	30.6 C (87.1 F)
1958	29.4 C (84.9 F)
1959	30.6 C (87.1 F)
1960	31.1 C (88.0 F)
1961	29.4 C (84.9 F)
1962	30.0 C (86.0 F)
1963	30.6 C (87.1 F)
1964	30.6 C (87.1 F)
1965	29.4 C (84.9 F)
1966	30.6 C (87.1 F)
1967	27.8 C (82.0 F)
1968	30.0 C (86.0 F)
1969	28.9 C (84.0 F)
1970	29.4 C (84.9 F)
1971	31.1 C (88.0 F)
1972	29.4 C (84.9 F)
1973	30.6 C (87.1 F)
1974	31.1 C (88.0 F)
1975	30.6 C (87.1 F)
1976	27.8 C (82.0 F)
1977	31.1 C (88.0 F)
1978	30.0 C (86.0 F)
1979	29.5 C (85.1 F)
1980	28.0 C (82.4 F)
1981	28.5 C (83.3 F)
1982	27.5 C (81.5 F)
1983	29.5 C (85.1 F)

Coldest night (TNn)

The coldest night of the year at Monticello, 1954 to 1983. The record is -35.6 C (-32.1 F) in 1977, marked on the chart; the median year is -28.9 C (-20.0 F).

Coldest night (TNn) at Monticello by year
Year	Coldest night (TNn)
1954	-21.1 C (-6.0 F)
1955	-31.7 C (-25.1 F)
1956	-20.6 C (-5.1 F)
1957	-23.3 C (-9.9 F)
1958	-31.7 C (-25.1 F)
1959	-28.3 C (-18.9 F)
1960	-28.9 C (-20.0 F)
1961	-32.8 C (-27.0 F)
1962	-31.1 C (-24.0 F)
1963	-30.6 C (-23.1 F)
1964	-27.8 C (-18.0 F)
1965	-28.3 C (-18.9 F)
1966	-27.2 C (-17.0 F)
1967	-28.9 C (-20.0 F)
1968	-30.0 C (-22.0 F)
1969	-26.1 C (-15.0 F)
1970	-29.4 C (-20.9 F)
1971	-26.7 C (-16.1 F)
1972	-27.2 C (-17.0 F)
1973	-27.2 C (-17.0 F)
1974	-25.6 C (-14.1 F)
1975	-28.3 C (-18.9 F)
1976	-31.1 C (-24.0 F)
1977	-35.6 C (-32.1 F)
1978	-34.5 C (-30.1 F)
1979	-33.0 C (-27.4 F)
1980	-31.5 C (-24.7 F)
1981	-33.0 C (-27.4 F)
1982	-29.5 C (-21.1 F)
1983	-26.5 C (-15.7 F)

Wettest day (Rx1day)

The wettest day of the year at Monticello, 1954 to 1983. The record is 84.6 mm (3.3 in) in 1954, marked on the chart; the median year is 39.6 mm (1.6 in).

Wettest day (Rx1day) at Monticello by year
Year	Wettest day (Rx1day)
1954	84.6 mm (3.3 in)
1955	40.6 mm (1.6 in)
1956	50.8 mm (2.0 in)
1957	38.1 mm (1.5 in)
1958	38.1 mm (1.5 in)
1959	35.1 mm (1.4 in)
1960	24.9 mm (1.0 in)
1961	35.6 mm (1.4 in)
1962	27.9 mm (1.1 in)
1963	37.6 mm (1.5 in)
1964	51.6 mm (2.0 in)
1965	39.1 mm (1.5 in)
1966	40.9 mm (1.6 in)
1967	43.7 mm (1.7 in)
1968	72.9 mm (2.9 in)
1969	34.5 mm (1.4 in)
1970	29.7 mm (1.2 in)
1971	23.9 mm (0.9 in)
1972	42.7 mm (1.7 in)
1973	33.3 mm (1.3 in)
1974	43.9 mm (1.7 in)
1975	48.3 mm (1.9 in)
1976	53.8 mm (2.1 in)
1977	68.8 mm (2.7 in)
1978	40.0 mm (1.6 in)
1979	35.8 mm (1.4 in)
1980	36.2 mm (1.4 in)
1981	67.4 mm (2.7 in)
1982	37.0 mm (1.5 in)
1983	46.8 mm (1.8 in)

Wettest five days (Rx5day)

The wettest five days of the year at Monticello, 1954 to 1983. The record is 142.9 mm (5.6 in) in 1954, marked on the chart; the median year is 63.4 mm (2.5 in).

Wettest five days (Rx5day) at Monticello by year
Year	Wettest five days (Rx5day)
1954	142.9 mm (5.6 in)
1955	59.7 mm (2.4 in)
1956	89.0 mm (3.5 in)
1957	87.6 mm (3.4 in)
1958	50.0 mm (2.0 in)
1959	62.2 mm (2.4 in)
1960	78.0 mm (3.1 in)
1961	41.9 mm (1.6 in)
1962	31.1 mm (1.2 in)
1963	46.3 mm (1.8 in)
1964	58.3 mm (2.3 in)
1965	47.6 mm (1.9 in)
1966	62.7 mm (2.5 in)
1967	74.4 mm (2.9 in)
1968	90.2 mm (3.6 in)
1969	55.9 mm (2.2 in)
1970	49.5 mm (1.9 in)
1971	46.3 mm (1.8 in)
1972	75.2 mm (3.0 in)
1973	60.7 mm (2.4 in)
1974	55.4 mm (2.2 in)
1975	69.9 mm (2.8 in)
1976	82.5 mm (3.2 in)
1977	80.0 mm (3.1 in)
1978	70.4 mm (2.8 in)
1979	64.0 mm (2.5 in)
1980	59.0 mm (2.3 in)
1981	132.2 mm (5.2 in)
1982	66.0 mm (2.6 in)
1983	97.0 mm (3.8 in)

Longest dry spell (CDD)

The longest dry spell of the year at Monticello, 1954 to 1983. The record is 32 days in 1979, marked on the chart; the median year is 14 days.

Longest dry spell (CDD) at Monticello by year
Year	Longest dry spell (CDD)
1954	8 days
1955	24 days
1956	21 days
1957	11 days
1958	16 days
1959	14 days
1960	17 days
1961	21 days
1962	7 days
1963	30 days
1964	10 days
1965	11 days
1966	23 days
1967	20 days
1968	11 days
1969	13 days
1970	10 days
1971	9 days
1972	13 days
1973	15 days
1974	10 days
1975	13 days
1976	13 days
1977	13 days
1978	18 days
1979	32 days
1980	16 days
1981	12 days
1982	14 days
1983	16 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

23 years with a frost

Across 23 years with a frost, the median last spring frost at Monticello falls on 19 May and the median first autumn frost on 25 September, which leaves a median of 125 days between them.

Frost dates and growing season at Monticello
Measure	Median, all years	Earliest period	Recent period (1959 to 1983)	Recent against earliest	Fitted trend
Last spring frost	19 May	n/a	19 May	n/a	n/a
First autumn frost	25 September	n/a	25 September	n/a	n/a
Growing days	125 days	n/a	125 days	n/a	n/a

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 Monticello standing records by year: CSV or JSON. Field meanings are on the data page.
Data for Monticello 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 2026-10-14 (14 October 2026). Records are computed by this site and are not official.

Data as of 2026-10-14. Last revised 14 October 2026 (2026-10-14).