Lucan Weather Records (CA006144665)

Record envelope, standing records and threshold days for Lucan (CA006144665), Ontario, Canada, with 105 years of record.

Key Facts for Lucan

Lucan (CA006144665) is a weather station in Ontario, Canada at 43.18 latitude and -81.42 longitude, 297 m (974 ft) above sea level.
The station reports from 1871 to 1975, 105 years of record.
1,464 records set at Lucan still stand.
Records are tracked for tmax, tmin, prcp, snow: an element needs 30 years of data to be eligible.
Lucan set a daily record precipitation of 15.5 mm (0.6 in) on 28 January 1975.

About the Station

Location: Ontario, Canada, 43.18 latitude, -81.42 longitude.
Elevation: 297 m (974 ft).
Period of record: 1871 to 1975, 105 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 Lucan. 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 Lucan, with 2026 drawn through them
Month	Highest record high	Lowest record low	2026 highest maximum	2026 lowest minimum
Jan	16.7 C (62.1 F)	-27.8 C (-18.0 F)	n/a	n/a
Feb	15.6 C (60.1 F)	-35.6 C (-32.1 F)	n/a	n/a
Mar	24.4 C (75.9 F)	-23.9 C (-11.0 F)	n/a	n/a
Apr	29.4 C (84.9 F)	-19.4 C (-2.9 F)	n/a	n/a
May	32.8 C (91.0 F)	-7.2 C (19.0 F)	n/a	n/a
Jun	38.9 C (102.0 F)	-2.2 C (28.0 F)	n/a	n/a
Jul	38.9 C (102.0 F)	3.9 C (39.0 F)	n/a	n/a
Aug	40.0 C (104.0 F)	1.7 C (35.1 F)	n/a	n/a
Sep	36.1 C (97.0 F)	-2.8 C (27.0 F)	n/a	n/a
Oct	30.6 C (87.1 F)	-6.7 C (19.9 F)	n/a	n/a
Nov	26.7 C (80.1 F)	-19.4 C (-2.9 F)	n/a	n/a
Dec	15.6 C (60.1 F)	-26.1 C (-15.0 F)	n/a	n/a

Which Years Hold Standing Records

1,464 standing records

1,464 records at Lucan still stand. 1920 holds the most, with 65.

Standing records at Lucan by the year they were set
Year set	Standing records
1915	9
1916	50
1917	52
1918	60
1919	31
1920	65
1921	45
1922	30
1923	45
1924	21
1925	46
1926	39
1927	48
1928	32
1929	29
1930	44
1931	40
1932	42
1933	32
1934	49
1935	36
1936	57
1937	28
1938	22
1939	19
1940	36
1941	25
1942	39
1943	29
1944	14
1945	35
1946	30
1947	30
1948	17
1950	29
1951	9
1952	22
1953	22
1954	25
1955	20
1956	27
1957	28
1958	9
1959	16
1960	23
1961	8

All-Time Record Progression

1 new records

1 all-time records were set at Lucan between 8 September 1942 and 8 September 1942. Each dot is a new record.

Wettest Day of Each Month

Sep: 118.1 mm (4.6 in)

The wettest day on record for each calendar month at Lucan. The most was 118.1 mm (4.6 in) on 8 September 1942.

Record daily precipitation for each month at Lucan
Month	Record daily precipitation (mm)	Date
Jan	45.7 mm (1.8 in)	19 January 1929
Feb	43.2 mm (1.7 in)	19 February 1939
Mar	63.5 mm (2.5 in)	28 March 1931
Apr	61.0 mm (2.4 in)	25 April 1937
May	82.8 mm (3.3 in)	15 May 1970
Jun	83.8 mm (3.3 in)	13 June 1943
Jul	115.6 mm (4.6 in)	10 July 1883
Aug	73.7 mm (2.9 in)	10 August 1938
Sep	118.1 mm (4.6 in)	8 September 1942
Oct	62.2 mm (2.4 in)	1 October 1945
Nov	49.8 mm (2.0 in)	18 November 1969
Dec	48.8 mm (1.9 in)	12 December 1946

Period of Record Coverage

1915 to 1961

46 years of record at Lucan, 1915 to 1961. 8 years have data for under 90 percent of days and are left out of rankings: 1915, 1924, 1948, 1951, 1954, 1958, 1959, 1961.

Days with data per year at Lucan
Year	Days with data	Share of year	Complete
1915	152	42%	No
1916	365	100%	Yes
1917	365	100%	Yes
1918	364	100%	Yes
1919	364	100%	Yes
1920	366	100%	Yes
1921	365	100%	Yes
1922	365	100%	Yes
1923	365	100%	Yes
1924	213	58%	No
1925	365	100%	Yes
1926	364	100%	Yes
1927	365	100%	Yes
1928	366	100%	Yes
1929	365	100%	Yes
1930	365	100%	Yes
1931	364	100%	Yes
1932	366	100%	Yes
1933	364	100%	Yes
1934	364	100%	Yes
1935	365	100%	Yes
1936	365	100%	Yes
1937	365	100%	Yes
1938	365	100%	Yes
1939	365	100%	Yes
1940	366	100%	Yes
1941	364	100%	Yes
1942	365	100%	Yes
1943	365	100%	Yes
1944	366	100%	Yes
1945	365	100%	Yes
1946	365	100%	Yes
1947	365	100%	Yes
1948	271	74%	No
1950	344	94%	Yes
1951	151	41%	No
1952	335	92%	Yes
1953	359	98%	Yes
1954	324	89%	No
1955	348	95%	Yes
1956	352	96%	Yes
1957	350	96%	Yes
1958	232	64%	No
1959	178	49%	No
1960	366	100%	Yes
1961	120	33%	No

Latest Records

Latest records at Lucan
Date	Station	Record	Value	Beat old record by	Old record stood	Significance
28 January 1975	Lucan, CA	daily rain	15.5 mm (0.6 in)	7.9 mm (0.31 in)	44 years	20 of 100 (Routine)
8 January 1975	Lucan, CA	daily rain	18.0 mm (0.7 in)	5.3 mm (0.21 in)	56 years	20 of 100 (Routine)
20 November 1974	Lucan, CA	daily rain	38.4 mm (1.5 in)	15.0 mm (0.6 in)	17 years	35 of 100 (Notable)
13 November 1974	Lucan, CA	daily snowfall (Tie)	10.2 cm (4.0 in)	tie	32 years	4 of 100 (Routine)
3 November 1974	Lucan, CA	daily rain	14.5 mm (0.6 in)	6.9 mm (0.27 in)	37 years	20 of 100 (Routine)
16 May 1974	Lucan, CA	daily rain	37.3 mm (1.5 in)	8.1 mm (0.32 in)	36 years	30 of 100 (Routine)
14 May 1974	Lucan, CA	daily rain (Tie)	20.3 mm (0.8 in)	tie	28 years	4 of 100 (Routine)
3 April 1974	Lucan, CA	daily rain	22.9 mm (0.9 in)	7.2 mm (0.28 in)	28 years	20 of 100 (Routine)
1 April 1974	Lucan, CA	daily rain	19.8 mm (0.8 in)	0.7 mm (0.03 in)	4 years	11 of 100 (Routine)
18 March 1974	Lucan, CA	daily snowfall	7.6 cm (3.0 in)	2.5 cm (1.0 in)	101 years	45 of 100 (Notable)
4 March 1974	Lucan, CA	daily rain	32.5 mm (1.3 in)	23.9 mm (0.9 in)	4 years	48 of 100 (Notable)
20 January 1974	Lucan, CA	daily rain	21.1 mm (0.8 in)	4.6 mm (0.18 in)	27 years	20 of 100 (Routine)
27 November 1973	Lucan, CA	daily rain	22.1 mm (0.9 in)	4.3 mm (0.17 in)	47 years	20 of 100 (Routine)
15 November 1973	Lucan, CA	daily rain	28.2 mm (1.1 in)	13.0 mm (0.5 in)	101 years	58 of 100 (Notable)
16 March 1973	Lucan, CA	daily snowfall	10.7 cm (4.2 in)	3.1 cm (1.2 in)	47 years	31 of 100 (Routine)
13 March 1973	Lucan, CA	daily rain	23.6 mm (0.9 in)	1.2 mm (0.05 in)	12 years	14 of 100 (Routine)
11 March 1973	Lucan, CA	daily rain	18.5 mm (0.7 in)	1.7 mm (0.07 in)	20 years	18 of 100 (Routine)
15 February 1973	Lucan, CA	daily snowfall	7.9 cm (3.1 in)	0.3 cm (0.1 in)	27 years	18 of 100 (Routine)
28 October 1972	Lucan, CA	daily rain	18.8 mm (0.7 in)	1.3 mm (0.05 in)	25 years	18 of 100 (Routine)
22 October 1972	Lucan, CA	daily rain	59.9 mm (2.4 in)	33.5 mm (1.3 in)	15 years	50 of 100 (Notable)

Climate Trend

33 complete years, 1916 to 1960

One stripe for each of 33 complete years at Lucan, 1916 to 1960. Blue stripes are years cooler than the station's own mean of 7.5 C (45.6 F); red stripes are warmer. The coolest year was 1917, at 5.3 C (41.5 F), and the warmest was 1921, at 9.3 C (48.7 F). The strongest colour marks a difference of 2.3 C (4.1 F).

Annual mean temperature at Lucan as warming stripes, 1916 to 1960
Year	Annual mean temperature	Difference from the station mean
1916	7.4 C	-0.18 C
1917	5.3 C	-2.24 C
1918	7.0 C	-0.56 C
1919	8.1 C	+0.59 C
1920	6.9 C	-0.61 C
1921	9.3 C	+1.74 C
1922	8.3 C	+0.72 C
1923	7.1 C	-0.45 C
1925	7.3 C	-0.22 C
1926	6.1 C	-1.44 C
1927	7.6 C	+0.09 C
1928	7.4 C	-0.14 C
1929	7.0 C	-0.52 C
1930	8.0 C	+0.50 C
1931	9.0 C	+1.41 C
1932	8.0 C	+0.50 C
1933	8.2 C	+0.70 C
1934	7.1 C	-0.46 C
1935	6.8 C	-0.72 C
1936	6.9 C	-0.62 C
1937	7.3 C	-0.25 C
1938	8.3 C	+0.80 C
1939	7.8 C	+0.28 C
1940	6.4 C	-1.10 C
1941	8.5 C	+0.97 C
1942	7.8 C	+0.25 C
1943	6.8 C	-0.78 C
1944	8.1 C	+0.51 C
1945	7.2 C	-0.32 C
1946	8.7 C	+1.15 C
1947	7.8 C	+0.27 C
1953	8.4 C	+0.88 C
1960	6.9 C	-0.65 C

The fitted trend in annual mean temperature here over 1916 to 1960 is 0.1 C (-0.2 to 0.4) per decade. The interval includes zero, so the trend is not clearly different from zero. In Fahrenheit: 0.2 F (-0.3 to 0.7) 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 Lucan
Measure	Per decade (C)	Per decade (F)	Period	Complete years	Reading
Annual mean temperature	0.1 C (-0.2 to 0.4) per decade	0.2 F (-0.3 to 0.7) per decade	1916 to 1960	33	Not clearly different from zero
Mean daily maximum	-0.1 C (-0.4 to 0.2) per decade	-0.2 F (-0.7 to 0.4) per decade	1916 to 1960	33	Not clearly different from zero
Mean daily minimum	0.3 C (0.1 to 0.6) per decade	0.6 F (0.1 to 1.1) per decade	1916 to 1960	33	Rise

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

1871 to 1975

Yearly extremes at Lucan: the record and the median year
Measure	Record	Year of the record	Median year	Years with a value
Hottest day (TXx)	40.0 C (104.0 F)	1918	35.0 C (95.0 F)	46
Coldest night (TNn)	-35.6 C (-32.1 F)	1934	-22.5 C (-8.5 F)	46
Wettest day (Rx1day)	118.1 mm (4.6 in)	1942	46.4 mm (1.8 in)	62
Wettest five days (Rx5day)	139.7 mm (5.5 in)	1937	69.1 mm (2.7 in)	62
Longest dry spell (CDD)	30 days	1927	17 days	62

Hottest day (TXx)

The hottest day of the year at Lucan, 1871 to 1975. The record is 40.0 C (104.0 F) in 1918, marked on the chart; the median year is 35.0 C (95.0 F).

Hottest day (TXx) at Lucan by year
Year	Hottest day (TXx)
1871	n/a
1872	n/a
1873	n/a
1880	n/a
1881	n/a
1882	n/a
1883	n/a
1884	n/a
1915	31.7 C (89.1 F)
1916	37.2 C (99.0 F)
1917	37.2 C (99.0 F)
1918	40.0 C (104.0 F)
1919	36.1 C (97.0 F)
1920	33.3 C (91.9 F)
1921	38.3 C (100.9 F)
1922	34.4 C (93.9 F)
1923	35.0 C (95.0 F)
1924	33.3 C (91.9 F)
1925	36.1 C (97.0 F)
1926	36.1 C (97.0 F)
1927	34.4 C (93.9 F)
1928	33.3 C (91.9 F)
1929	35.6 C (96.1 F)
1930	35.6 C (96.1 F)
1931	36.1 C (97.0 F)
1932	34.4 C (93.9 F)
1933	38.3 C (100.9 F)
1934	38.9 C (102.0 F)
1935	35.0 C (95.0 F)
1936	38.9 C (102.0 F)
1937	34.4 C (93.9 F)
1938	35.0 C (95.0 F)
1939	36.1 C (97.0 F)
1940	35.0 C (95.0 F)
1941	37.2 C (99.0 F)
1942	33.9 C (93.0 F)
1943	33.3 C (91.9 F)
1944	37.2 C (99.0 F)
1945	32.2 C (90.0 F)
1946	35.0 C (95.0 F)
1947	35.0 C (95.0 F)
1948	35.0 C (95.0 F)
1950	36.7 C (98.1 F)
1951	31.7 C (89.1 F)
1952	34.4 C (93.9 F)
1953	34.4 C (93.9 F)
1954	32.2 C (90.0 F)
1955	35.6 C (96.1 F)
1956	31.7 C (89.1 F)
1957	33.3 C (91.9 F)
1958	30.6 C (87.1 F)
1959	32.8 C (91.0 F)
1960	32.2 C (90.0 F)
1961	18.3 C (64.9 F)
1968	n/a
1969	n/a
1970	n/a
1971	n/a
1972	n/a
1973	n/a
1974	n/a
1975	n/a

Coldest night (TNn)

The coldest night of the year at Lucan, 1871 to 1975. The record is -35.6 C (-32.1 F) in 1934, marked on the chart; the median year is -22.5 C (-8.5 F).

Coldest night (TNn) at Lucan by year
Year	Coldest night (TNn)
1871	n/a
1872	n/a
1873	n/a
1880	n/a
1881	n/a
1882	n/a
1883	n/a
1884	n/a
1915	-16.7 C (1.9 F)
1916	-23.9 C (-11.0 F)
1917	-27.2 C (-17.0 F)
1918	-30.0 C (-22.0 F)
1919	-22.8 C (-9.0 F)
1920	-27.8 C (-18.0 F)
1921	-18.9 C (-2.0 F)
1922	-22.8 C (-9.0 F)
1923	-20.6 C (-5.1 F)
1924	-23.3 C (-9.9 F)
1925	-27.2 C (-17.0 F)
1926	-23.3 C (-9.9 F)
1927	-25.6 C (-14.1 F)
1928	-26.1 C (-15.0 F)
1929	-26.1 C (-15.0 F)
1930	-22.8 C (-9.0 F)
1931	-17.8 C (0.0 F)
1932	-20.6 C (-5.1 F)
1933	-25.6 C (-14.1 F)
1934	-35.6 C (-32.1 F)
1935	-27.8 C (-18.0 F)
1936	-23.9 C (-11.0 F)
1937	-22.8 C (-9.0 F)
1938	-20.0 C (-4.0 F)
1939	-21.1 C (-6.0 F)
1940	-24.4 C (-11.9 F)
1941	-21.7 C (-7.1 F)
1942	-26.1 C (-15.0 F)
1943	-21.7 C (-7.1 F)
1944	-20.6 C (-5.1 F)
1945	-22.2 C (-8.0 F)
1946	-20.6 C (-5.1 F)
1947	-17.8 C (0.0 F)
1948	-25.6 C (-14.1 F)
1950	-21.1 C (-6.0 F)
1951	-17.2 C (1.0 F)
1952	-20.6 C (-5.1 F)
1953	-15.6 C (3.9 F)
1954	-22.2 C (-8.0 F)
1955	-22.2 C (-8.0 F)
1956	-19.4 C (-2.9 F)
1957	-24.4 C (-11.9 F)
1958	-22.2 C (-8.0 F)
1959	-15.6 C (3.9 F)
1960	-22.2 C (-8.0 F)
1961	-26.7 C (-16.1 F)
1968	n/a
1969	n/a
1970	n/a
1971	n/a
1972	n/a
1973	n/a
1974	n/a
1975	n/a

Wettest day (Rx1day)

The wettest day of the year at Lucan, 1871 to 1975. The record is 118.1 mm (4.6 in) in 1942, marked on the chart; the median year is 46.4 mm (1.8 in).

Wettest day (Rx1day) at Lucan by year
Year	Wettest day (Rx1day)
1871	31.8 mm (1.3 in)
1872	30.5 mm (1.2 in)
1873	21.3 mm (0.8 in)
1880	54.9 mm (2.2 in)
1881	48.3 mm (1.9 in)
1882	30.5 mm (1.2 in)
1883	115.6 mm (4.6 in)
1884	49.3 mm (1.9 in)
1915	46.0 mm (1.8 in)
1916	44.7 mm (1.8 in)
1917	36.8 mm (1.4 in)
1918	47.5 mm (1.9 in)
1919	40.6 mm (1.6 in)
1920	35.6 mm (1.4 in)
1921	63.0 mm (2.5 in)
1922	53.3 mm (2.1 in)
1923	30.5 mm (1.2 in)
1924	38.1 mm (1.5 in)
1925	38.1 mm (1.5 in)
1926	57.2 mm (2.3 in)
1927	65.8 mm (2.6 in)
1928	57.7 mm (2.3 in)
1929	45.7 mm (1.8 in)
1930	33.0 mm (1.3 in)
1931	63.5 mm (2.5 in)
1932	56.9 mm (2.2 in)
1933	30.5 mm (1.2 in)
1934	59.7 mm (2.4 in)
1935	53.1 mm (2.1 in)
1936	38.1 mm (1.5 in)
1937	61.0 mm (2.4 in)
1938	73.7 mm (2.9 in)
1939	48.3 mm (1.9 in)
1940	40.6 mm (1.6 in)
1941	43.2 mm (1.7 in)
1942	118.1 mm (4.6 in)
1943	83.8 mm (3.3 in)
1944	33.5 mm (1.3 in)
1945	62.2 mm (2.4 in)
1946	48.8 mm (1.9 in)
1947	64.0 mm (2.5 in)
1948	44.5 mm (1.8 in)
1950	35.6 mm (1.4 in)
1951	30.5 mm (1.2 in)
1952	29.0 mm (1.1 in)
1953	42.4 mm (1.7 in)
1954	55.4 mm (2.2 in)
1955	61.0 mm (2.4 in)
1956	47.8 mm (1.9 in)
1957	46.7 mm (1.8 in)
1958	37.1 mm (1.5 in)
1959	54.1 mm (2.1 in)
1960	40.6 mm (1.6 in)
1961	25.7 mm (1.0 in)
1968	36.1 mm (1.4 in)
1969	49.8 mm (2.0 in)
1970	82.8 mm (3.3 in)
1971	56.4 mm (2.2 in)
1972	59.9 mm (2.4 in)
1973	43.2 mm (1.7 in)
1974	38.4 mm (1.5 in)
1975	18.0 mm (0.7 in)

Wettest five days (Rx5day)

The wettest five days of the year at Lucan, 1871 to 1975. The record is 139.7 mm (5.5 in) in 1937, marked on the chart; the median year is 69.1 mm (2.7 in).

Wettest five days (Rx5day) at Lucan by year
Year	Wettest five days (Rx5day)
1871	55.9 mm (2.2 in)
1872	49.3 mm (1.9 in)
1873	46.0 mm (1.8 in)
1880	61.8 mm (2.4 in)
1881	67.8 mm (2.7 in)
1882	49.8 mm (2.0 in)
1883	134.2 mm (5.3 in)
1884	63.3 mm (2.5 in)
1915	59.7 mm (2.4 in)
1916	68.5 mm (2.7 in)
1917	64.6 mm (2.5 in)
1918	73.6 mm (2.9 in)
1919	73.6 mm (2.9 in)
1920	61.3 mm (2.4 in)
1921	90.5 mm (3.6 in)
1922	93.1 mm (3.7 in)
1923	78.7 mm (3.1 in)
1924	66.1 mm (2.6 in)
1925	57.8 mm (2.3 in)
1926	66.6 mm (2.6 in)
1927	115.9 mm (4.6 in)
1928	73.7 mm (2.9 in)
1929	65.8 mm (2.6 in)
1930	79.3 mm (3.1 in)
1931	116.9 mm (4.6 in)
1932	107.9 mm (4.2 in)
1933	56.7 mm (2.2 in)
1934	90.5 mm (3.6 in)
1935	78.5 mm (3.1 in)
1936	63.8 mm (2.5 in)
1937	139.7 mm (5.5 in)
1938	94.5 mm (3.7 in)
1939	87.4 mm (3.4 in)
1940	87.1 mm (3.4 in)
1941	60.4 mm (2.4 in)
1942	122.4 mm (4.8 in)
1943	125.5 mm (4.9 in)
1944	45.0 mm (1.8 in)
1945	127.0 mm (5.0 in)
1946	66.6 mm (2.6 in)
1947	77.0 mm (3.0 in)
1948	77.2 mm (3.0 in)
1950	63.6 mm (2.5 in)
1951	35.5 mm (1.4 in)
1952	50.8 mm (2.0 in)
1953	47.4 mm (1.9 in)
1954	112.1 mm (4.4 in)
1955	64.3 mm (2.5 in)
1956	65.1 mm (2.6 in)
1957	88.1 mm (3.5 in)
1958	53.4 mm (2.1 in)
1959	95.0 mm (3.7 in)
1960	61.7 mm (2.4 in)
1961	46.7 mm (1.8 in)
1968	69.6 mm (2.7 in)
1969	84.1 mm (3.3 in)
1970	103.3 mm (4.1 in)
1971	64.8 mm (2.6 in)
1972	76.2 mm (3.0 in)
1973	71.1 mm (2.8 in)
1974	76.2 mm (3.0 in)
1975	35.8 mm (1.4 in)

Longest dry spell (CDD)

The longest dry spell of the year at Lucan, 1871 to 1975. The record is 30 days in 1927, marked on the chart; the median year is 17 days.

Longest dry spell (CDD) at Lucan by year
Year	Longest dry spell (CDD)
1871	19 days
1872	20 days
1873	17 days
1880	12 days
1881	21 days
1882	11 days
1883	12 days
1884	23 days
1915	16 days
1916	18 days
1917	19 days
1918	16 days
1919	18 days
1920	16 days
1921	18 days
1922	17 days
1923	12 days
1924	23 days
1925	17 days
1926	19 days
1927	30 days
1928	14 days
1929	20 days
1930	19 days
1931	12 days
1932	16 days
1933	25 days
1934	18 days
1935	17 days
1936	23 days
1937	13 days
1938	15 days
1939	16 days
1940	11 days
1941	16 days
1942	21 days
1943	22 days
1944	18 days
1945	13 days
1946	21 days
1947	21 days
1948	19 days
1950	16 days
1951	15 days
1952	20 days
1953	21 days
1954	18 days
1955	19 days
1956	16 days
1957	17 days
1958	26 days
1959	13 days
1960	11 days
1961	15 days
1968	9 days
1969	19 days
1970	14 days
1971	14 days
1972	12 days
1973	27 days
1974	14 days
1975	5 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 Lucan falls on 13 May and the median first autumn frost on 6 October, which leaves a median of 143 days between them.

Fitted over all years, the growing season changes by +5.7 days per decade at this station.

Frost dates and growing season at Lucan
Measure	Median, all years	Earliest period	Recent period (1919 to 1960)	Recent against earliest	Fitted trend
Last spring frost	13 May	n/a	13 May	n/a	-3.0 days per decade
First autumn frost	6 October	n/a	7 October	n/a	+2.7 days per decade
Growing days	143 days	n/a	144 days	n/a	+5.7 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

44 years, 1872 to 1974

A day with at least 48.2 mm (1.9 in) of rain is expected about once in 2 years. A day with at least 107.7 mm (4.2 in) of rain is expected about once in 100 years.

Rainfall return levels at Lucan: the daily rain expected about once in a given number of years
Expected about once in	A day with at least	Note
2 years	48.2 mm (1.9 in)
5 years	62.5 mm (2.5 in)
10 years	72.6 mm (2.9 in)
25 years	86.1 mm (3.4 in)
50 years	96.7 mm (3.8 in)	Longer than the 44 years of record
100 years	107.7 mm (4.2 in)	Longer than the 44 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, 44 years of values from 1872 to 1974.

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: 118.1 mm (4.6 in) in 1942; 83.8 mm (3.3 in) in 1943; 82.8 mm (3.3 in) in 1970.

Download the Data

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