Killaloe Weather Records (CA006104125)

Record envelope, standing records and threshold days for Killaloe (CA006104125), Ontario, Canada, with 35 years of record.

Key Facts for Killaloe

Killaloe (CA006104125) is a weather station in Ontario, Canada at 45.57 latitude and -77.42 longitude, 174 m (571 ft) above sea level.
The station reports from 1938 to 1972, 35 years of record.
1,464 records set at Killaloe still stand.
Records are tracked for tmax, tmin, prcp, snow: an element needs 30 years of data to be eligible.
Killaloe tied a daily record low maximum temperature of -9.4 C (15.1 F) on 5 December 1972.

About the Station

Location: Ontario, Canada, 45.57 latitude, -77.42 longitude.
Elevation: 174 m (571 ft).
Period of record: 1938 to 1972, 35 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 Killaloe. 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 Killaloe, with 2026 drawn through them
Month	Highest record high	Lowest record low	2026 highest maximum	2026 lowest minimum
Jan	16.1 C (61.0 F)	-40.0 C (-40.0 F)	n/a	n/a
Feb	12.2 C (54.0 F)	-41.1 C (-42.0 F)	n/a	n/a
Mar	26.1 C (79.0 F)	-39.4 C (-38.9 F)	n/a	n/a
Apr	30.0 C (86.0 F)	-25.0 C (-13.0 F)	n/a	n/a
May	33.3 C (91.9 F)	-9.4 C (15.1 F)	n/a	n/a
Jun	35.0 C (95.0 F)	-3.9 C (25.0 F)	n/a	n/a
Jul	35.0 C (95.0 F)	0.0 C (32.0 F)	n/a	n/a
Aug	36.7 C (98.1 F)	-1.7 C (28.9 F)	n/a	n/a
Sep	34.4 C (93.9 F)	-7.8 C (18.0 F)	n/a	n/a
Oct	30.0 C (86.0 F)	-14.4 C (6.1 F)	n/a	n/a
Nov	23.9 C (75.0 F)	-28.3 C (-18.9 F)	n/a	n/a
Dec	15.0 C (59.0 F)	-40.6 C (-41.1 F)	n/a	n/a

Which Years Hold Standing Records

1,464 standing records

1,464 records at Killaloe still stand. 1940 holds the most, with 66.

Standing records at Killaloe by the year they were set
Year set	Standing records
1938	13
1939	48
1940	66
1941	42
1942	44
1943	51
1944	36
1945	55
1946	62
1947	57
1948	38
1949	63
1950	51
1951	40
1952	29
1953	56
1954	30
1955	47
1956	34
1957	55
1958	32
1959	43
1960	28
1961	25
1962	44
1963	36
1964	39
1965	56
1966	40
1967	31
1968	46
1969	24
1970	32
1971	34
1972	37

Wettest Day of Each Month

Aug: 62.0 mm (2.4 in)

The wettest day on record for each calendar month at Killaloe. The most was 62.0 mm (2.4 in) on 28 August 1967.

Record daily precipitation for each month at Killaloe
Month	Record daily precipitation (mm)	Date
Jan	31.8 mm (1.3 in)	27 January 1967
Feb	51.3 mm (2.0 in)	19 February 1960
Mar	29.7 mm (1.2 in)	24 March 1966
Apr	34.5 mm (1.4 in)	23 April 1969
May	44.7 mm (1.8 in)	13 May 1956
Jun	57.4 mm (2.3 in)	21 June 1972
Jul	58.4 mm (2.3 in)	20 July 1970
Aug	62.0 mm (2.4 in)	28 August 1967
Sep	61.7 mm (2.4 in)	28 September 1967
Oct	52.1 mm (2.1 in)	12 October 1946
Nov	42.2 mm (1.7 in)	10 November 1962
Dec	31.8 mm (1.3 in)	12 December 1944

Period of Record Coverage

1938 to 1972

35 years of record at Killaloe, 1938 to 1972. 1 years have data for under 90 percent of days and are left out of rankings: 1938.

Days with data per year at Killaloe
Year	Days with data	Share of year	Complete
1938	122	33%	No
1939	364	100%	Yes
1940	366	100%	Yes
1941	365	100%	Yes
1942	364	100%	Yes
1943	365	100%	Yes
1944	365	100%	Yes
1945	365	100%	Yes
1946	365	100%	Yes
1947	362	99%	Yes
1948	366	100%	Yes
1949	365	100%	Yes
1950	364	100%	Yes
1951	364	100%	Yes
1952	366	100%	Yes
1953	365	100%	Yes
1954	365	100%	Yes
1955	364	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	365	100%	Yes
1963	365	100%	Yes
1964	366	100%	Yes
1965	365	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	341	93%	Yes

Latest Records

Latest records at Killaloe
Date	Station	Record	Value	Beat old record by	Old record stood	Significance
5 December 1972	Killaloe, CA	daily low max (Tie)	-9.4 C (15.1 F)	tie	32 years	3 of 100 (Routine)
4 December 1972	Killaloe, CA	daily low max	-15.0 C (5.0 F)	3.9 C (7.0 F)	8 years	10 of 100 (Routine)
26 November 1972	Killaloe, CA	daily rain	9.1 mm (0.36 in)	0.2 mm (0.01 in)	24 years	10 of 100 (Routine)
23 November 1972	Killaloe, CA	daily low min	-20.6 C (-5.1 F)	2.8 C (5.0 F)	1 year	7 of 100 (Routine)
22 November 1972	Killaloe, CA	daily low max (Tie)	-6.7 C (19.9 F)	tie	8 years	1 of 100 (Routine)
8 November 1972	Killaloe, CA	daily rain	39.6 mm (1.6 in)	23.1 mm (0.9 in)	29 years	51 of 100 (Notable)
25 October 1972	Killaloe, CA	daily snowfall	0.3 cm (0.1 in)	0.3 cm (0.1 in)	34 years	13 of 100 (Routine)
24 October 1972	Killaloe, CA	daily low max (Tie)	2.8 C (37.0 F)	tie	12 years	1 of 100 (Routine)
20 October 1972	Killaloe, CA	daily low min (Tie)	-10.0 C (14.0 F)	tie	2 years	0 of 100 (Routine)
19 October 1972	Killaloe, CA	daily low min	-12.8 C (9.0 F)	2.2 C (4.0 F)	32 years	16 of 100 (Routine)
19 October 1972	Killaloe, CA	daily low max (Tie)	2.2 C (36.0 F)	tie	32 years	3 of 100 (Routine)
18 October 1972	Killaloe, CA	monthly low min	-14.4 C (6.1 F)	2.7 C (4.9 F)	8 years	19 of 100 (Routine)
17 October 1972	Killaloe, CA	daily snowfall	0.3 cm (0.1 in)	0.3 cm (0.1 in)	34 years	13 of 100 (Routine)
14 October 1972	Killaloe, CA	daily snowfall	0.3 cm (0.1 in)	0.3 cm (0.1 in)	34 years	13 of 100 (Routine)
10 October 1972	Killaloe, CA	daily low min	-9.4 C (15.1 F)	0.5 C (0.9 F)	29 years	11 of 100 (Routine)
9 October 1972	Killaloe, CA	daily low max	4.4 C (39.9 F)	3.4 C (6.1 F)	27 years	16 of 100 (Routine)
7 October 1972	Killaloe, CA	daily low max (Tie)	6.7 C (44.1 F)	tie	5 years	1 of 100 (Routine)
6 October 1972	Killaloe, CA	daily rain	15.7 mm (0.6 in)	5.3 mm (0.21 in)	32 years	19 of 100 (Routine)
30 September 1972	Killaloe, CA	daily snowfall	0.3 cm (0.1 in)	0.3 cm (0.1 in)	34 years	13 of 100 (Routine)
26 September 1972	Killaloe, CA	daily high min	16.7 C (62.1 F)	3.9 C (7.0 F)	14 years	13 of 100 (Routine)

Climate Trend

33 complete years, 1939 to 1971

One stripe for each of 33 complete years at Killaloe, 1939 to 1971. Blue stripes are years cooler than the station's own mean of 4.5 C (40.1 F); red stripes are warmer. The coolest year was 1970, at 3.2 C (37.8 F), and the warmest was 1953, at 6.6 C (43.9 F). The strongest colour marks a difference of 2.1 C (3.8 F).

Annual mean temperature at Killaloe as warming stripes, 1939 to 1971
Year	Annual mean temperature	Difference from the station mean
1939	4.0 C	-0.48 C
1940	3.3 C	-1.25 C
1941	4.7 C	+0.15 C
1942	5.0 C	+0.45 C
1943	3.7 C	-0.85 C
1944	5.1 C	+0.61 C
1945	4.8 C	+0.28 C
1946	5.2 C	+0.71 C
1947	4.8 C	+0.27 C
1948	5.2 C	+0.65 C
1949	5.7 C	+1.14 C
1950	4.5 C	-0.01 C
1951	4.8 C	+0.30 C
1952	5.8 C	+1.27 C
1953	6.6 C	+2.10 C
1954	4.9 C	+0.41 C
1955	5.2 C	+0.71 C
1956	4.2 C	-0.33 C
1957	5.3 C	+0.81 C
1958	4.3 C	-0.19 C
1959	4.7 C	+0.16 C
1960	4.6 C	+0.11 C
1961	4.6 C	+0.07 C
1962	3.4 C	-1.10 C
1963	3.5 C	-1.04 C
1964	4.8 C	+0.27 C
1965	3.4 C	-1.15 C
1966	4.3 C	-0.27 C
1967	3.7 C	-0.78 C
1968	4.0 C	-0.53 C
1969	4.3 C	-0.27 C
1970	3.2 C	-1.29 C
1971	3.7 C	-0.86 C

The annual mean temperature here has fallen by 0.30 C (0.02 to 0.58) per decade over 1939 to 1971. In Fahrenheit: 0.54 F (0.03 to 1.04) 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 Killaloe
Measure	Per decade (C)	Per decade (F)	Period	Complete years	Reading
Annual mean temperature	-0.30 C (-0.58 to -0.02) per decade	-0.54 F (-1.04 to -0.03) per decade	1939 to 1971	33	Fall
Mean daily maximum	-0.1 C (-0.4 to 0.2) per decade	-0.2 F (-0.6 to 0.3) per decade	1939 to 1971	33	Not clearly different from zero
Mean daily minimum	-0.5 C (-0.9 to -0.1) per decade	-0.9 F (-1.5 to -0.2) per decade	1939 to 1971	33	Fall

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

1938 to 1972

Yearly extremes at Killaloe: 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)	1944	33.3 C (91.9 F)	35
Coldest night (TNn)	-41.1 C (-42.0 F)	1962	-37.8 C (-36.0 F)	35
Wettest day (Rx1day)	62.0 mm (2.4 in)	1967	38.4 mm (1.5 in)	35
Wettest five days (Rx5day)	100.7 mm (4.0 in)	1967	59.5 mm (2.3 in)	35
Longest dry spell (CDD)	41 days	1961	18 days	35

Hottest day (TXx)

The hottest day of the year at Killaloe, 1938 to 1972. The record is 36.7 C (98.1 F) in 1944, marked on the chart; the median year is 33.3 C (91.9 F).

Hottest day (TXx) at Killaloe by year
Year	Hottest day (TXx)
1938	29.4 C (84.9 F)
1939	34.4 C (93.9 F)
1940	32.2 C (90.0 F)
1941	34.4 C (93.9 F)
1942	33.9 C (93.0 F)
1943	31.7 C (89.1 F)
1944	36.7 C (98.1 F)
1945	32.2 C (90.0 F)
1946	33.3 C (91.9 F)
1947	33.3 C (91.9 F)
1948	34.4 C (93.9 F)
1949	36.1 C (97.0 F)
1950	31.7 C (89.1 F)
1951	30.6 C (87.1 F)
1952	32.8 C (91.0 F)
1953	34.4 C (93.9 F)
1954	29.4 C (84.9 F)
1955	35.6 C (96.1 F)
1956	33.9 C (93.0 F)
1957	33.3 C (91.9 F)
1958	33.3 C (91.9 F)
1959	33.9 C (93.0 F)
1960	34.4 C (93.9 F)
1961	32.2 C (90.0 F)
1962	33.9 C (93.0 F)
1963	34.4 C (93.9 F)
1964	33.9 C (93.0 F)
1965	32.8 C (91.0 F)
1966	35.0 C (95.0 F)
1967	30.6 C (87.1 F)
1968	33.3 C (91.9 F)
1969	32.8 C (91.0 F)
1970	31.1 C (88.0 F)
1971	32.8 C (91.0 F)
1972	32.8 C (91.0 F)

Coldest night (TNn)

The coldest night of the year at Killaloe, 1938 to 1972. The record is -41.1 C (-42.0 F) in 1962, marked on the chart; the median year is -37.8 C (-36.0 F).

Coldest night (TNn) at Killaloe by year
Year	Coldest night (TNn)
1938	-25.6 C (-14.1 F)
1939	-36.1 C (-33.0 F)
1940	-35.0 C (-31.0 F)
1941	-35.6 C (-32.1 F)
1942	-40.6 C (-41.1 F)
1943	-38.3 C (-36.9 F)
1944	-35.6 C (-32.1 F)
1945	-40.0 C (-40.0 F)
1946	-37.8 C (-36.0 F)
1947	-40.0 C (-40.0 F)
1948	-37.2 C (-35.0 F)
1949	-31.1 C (-24.0 F)
1950	-39.4 C (-38.9 F)
1951	-40.6 C (-41.1 F)
1952	-38.3 C (-36.9 F)
1953	-26.7 C (-16.1 F)
1954	-37.8 C (-36.0 F)
1955	-36.7 C (-34.1 F)
1956	-27.8 C (-18.0 F)
1957	-38.9 C (-38.0 F)
1958	-37.8 C (-36.0 F)
1959	-36.7 C (-34.1 F)
1960	-32.2 C (-26.0 F)
1961	-36.7 C (-34.1 F)
1962	-41.1 C (-42.0 F)
1963	-37.2 C (-35.0 F)
1964	-29.4 C (-20.9 F)
1965	-37.8 C (-36.0 F)
1966	-37.8 C (-36.0 F)
1967	-38.3 C (-36.9 F)
1968	-38.9 C (-38.0 F)
1969	-34.4 C (-29.9 F)
1970	-40.0 C (-40.0 F)
1971	-40.0 C (-40.0 F)
1972	-37.2 C (-35.0 F)

Wettest day (Rx1day)

The wettest day of the year at Killaloe, 1938 to 1972. The record is 62.0 mm (2.4 in) in 1967, marked on the chart; the median year is 38.4 mm (1.5 in).

Wettest day (Rx1day) at Killaloe by year
Year	Wettest day (Rx1day)
1938	56.1 mm (2.2 in)
1939	50.8 mm (2.0 in)
1940	38.1 mm (1.5 in)
1941	32.5 mm (1.3 in)
1942	37.1 mm (1.5 in)
1943	27.4 mm (1.1 in)
1944	45.2 mm (1.8 in)
1945	50.0 mm (2.0 in)
1946	52.1 mm (2.1 in)
1947	41.9 mm (1.6 in)
1948	49.5 mm (1.9 in)
1949	25.4 mm (1.0 in)
1950	38.4 mm (1.5 in)
1951	25.9 mm (1.0 in)
1952	33.5 mm (1.3 in)
1953	41.4 mm (1.6 in)
1954	28.2 mm (1.1 in)
1955	36.3 mm (1.4 in)
1956	44.7 mm (1.8 in)
1957	43.4 mm (1.7 in)
1958	32.5 mm (1.3 in)
1959	49.3 mm (1.9 in)
1960	51.3 mm (2.0 in)
1961	31.5 mm (1.2 in)
1962	42.2 mm (1.7 in)
1963	37.8 mm (1.5 in)
1964	24.6 mm (1.0 in)
1965	23.4 mm (0.9 in)
1966	34.0 mm (1.3 in)
1967	62.0 mm (2.4 in)
1968	31.0 mm (1.2 in)
1969	39.9 mm (1.6 in)
1970	58.4 mm (2.3 in)
1971	34.8 mm (1.4 in)
1972	57.4 mm (2.3 in)

Wettest five days (Rx5day)

The wettest five days of the year at Killaloe, 1938 to 1972. The record is 100.7 mm (4.0 in) in 1967, marked on the chart; the median year is 59.5 mm (2.3 in).

Wettest five days (Rx5day) at Killaloe by year
Year	Wettest five days (Rx5day)
1938	91.9 mm (3.6 in)
1939	82.9 mm (3.3 in)
1940	93.0 mm (3.7 in)
1941	69.7 mm (2.7 in)
1942	51.5 mm (2.0 in)
1943	54.4 mm (2.1 in)
1944	59.5 mm (2.3 in)
1945	55.7 mm (2.2 in)
1946	59.0 mm (2.3 in)
1947	63.2 mm (2.5 in)
1948	60.2 mm (2.4 in)
1949	34.5 mm (1.4 in)
1950	62.6 mm (2.5 in)
1951	36.1 mm (1.4 in)
1952	49.7 mm (2.0 in)
1953	59.9 mm (2.4 in)
1954	43.2 mm (1.7 in)
1955	95.5 mm (3.8 in)
1956	74.2 mm (2.9 in)
1957	66.0 mm (2.6 in)
1958	43.4 mm (1.7 in)
1959	84.9 mm (3.3 in)
1960	57.6 mm (2.3 in)
1961	50.6 mm (2.0 in)
1962	51.8 mm (2.0 in)
1963	66.8 mm (2.6 in)
1964	33.0 mm (1.3 in)
1965	36.4 mm (1.4 in)
1966	56.1 mm (2.2 in)
1967	100.7 mm (4.0 in)
1968	58.2 mm (2.3 in)
1969	60.7 mm (2.4 in)
1970	67.5 mm (2.7 in)
1971	42.4 mm (1.7 in)
1972	98.4 mm (3.9 in)

Longest dry spell (CDD)

The longest dry spell of the year at Killaloe, 1938 to 1972. The record is 41 days in 1961, marked on the chart; the median year is 18 days.

Longest dry spell (CDD) at Killaloe by year
Year	Longest dry spell (CDD)
1938	14 days
1939	20 days
1940	14 days
1941	27 days
1942	16 days
1943	18 days
1944	19 days
1945	21 days
1946	11 days
1947	16 days
1948	16 days
1949	16 days
1950	22 days
1951	14 days
1952	20 days
1953	15 days
1954	18 days
1955	18 days
1956	16 days
1957	33 days
1958	20 days
1959	21 days
1960	18 days
1961	41 days
1962	19 days
1963	20 days
1964	20 days
1965	20 days
1966	15 days
1967	22 days
1968	18 days
1969	17 days
1970	17 days
1971	15 days
1972	13 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 Killaloe falls on 29 May and the median first autumn frost on 9 September, which leaves a median of 104 days between them.

Fitted over all years, the growing season changes by -5.2 days per decade at this station.

Frost dates and growing season at Killaloe
Measure	Median, all years	Earliest period	Recent period (1942 to 1971)	Recent against earliest	Fitted trend
Last spring frost	29 May	n/a	30 May	n/a	+3.6 days per decade
First autumn frost	9 September	n/a	10 September	n/a	-1.6 days per decade
Growing days	104 days	n/a	104 days	n/a	-5.2 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, 1939 to 1972

A day with at least 38.9 mm (1.5 in) of rain is expected about once in 2 years. A day with at least 67.7 mm (2.7 in) of rain is expected about once in 100 years.

Rainfall return levels at Killaloe: the daily rain expected about once in a given number of years
Expected about once in	A day with at least	Note
2 years	38.9 mm (1.5 in)
5 years	48.4 mm (1.9 in)
10 years	53.9 mm (2.1 in)
25 years	60.1 mm (2.4 in)
50 years	64.1 mm (2.5 in)	Longer than the 34 years of record
100 years	67.7 mm (2.7 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 1939 to 1972.

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: 62.0 mm (2.4 in) in 1967; 58.4 mm (2.3 in) in 1970; 57.4 mm (2.3 in) in 1972.

Download the Data

Data for Killaloe standing records by year: CSV or JSON. Field meanings are on the data page.
Data for Killaloe 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).