Red Deer Weather Records (CA003025440)

Record envelope, standing records and threshold days for Red Deer (CA003025440), Alberta, Canada, with 71 years of record.

Key Facts for Red Deer

Red Deer (CA003025440) is a weather station in Alberta, Canada at 52.28 latitude and -113.82 longitude, 860 m (2,822 ft) above sea level.
The station reports from 1904 to 1974, 71 years of record.
1,464 records set at Red Deer still stand.
Records are tracked for tmax, tmin, prcp, snow: an element needs 30 years of data to be eligible.
Red Deer tied a monthly record high minimum temperature of 10.0 C (50.0 F) on 26 April 1974.

About the Station

Location: Alberta, Canada, 52.28 latitude, -113.82 longitude.
Elevation: 860 m (2,822 ft).
Period of record: 1904 to 1974, 71 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 Red Deer. 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 Red Deer, with 2026 drawn through them
Month	Highest record high	Lowest record low	2026 highest maximum	2026 lowest minimum
Jan	11.7 C (53.1 F)	-46.7 C (-52.1 F)	n/a	n/a
Feb	15.6 C (60.1 F)	-44.4 C (-47.9 F)	n/a	n/a
Mar	21.1 C (70.0 F)	-40.6 C (-41.1 F)	n/a	n/a
Apr	28.3 C (82.9 F)	-31.7 C (-25.1 F)	n/a	n/a
May	33.3 C (91.9 F)	-12.8 C (9.0 F)	n/a	n/a
Jun	37.2 C (99.0 F)	-6.1 C (21.0 F)	n/a	n/a
Jul	37.2 C (99.0 F)	-1.1 C (30.0 F)	n/a	n/a
Aug	36.1 C (97.0 F)	-3.3 C (26.1 F)	n/a	n/a
Sep	31.7 C (89.1 F)	-12.8 C (9.0 F)	n/a	n/a
Oct	29.4 C (84.9 F)	-26.1 C (-15.0 F)	n/a	n/a
Nov	20.6 C (69.1 F)	-37.2 C (-35.0 F)	n/a	n/a
Dec	15.0 C (59.0 F)	-50.6 C (-59.1 F)	n/a	n/a

Which Years Hold Standing Records

1,464 standing records

1,464 records at Red Deer still stand. 1906 holds the most, with 63.

Standing records at Red Deer by the year they were set
Year set	Standing records
1904	10
1905	3
1906	63
1909	33
1910	35
1911	19
1914	21
1915	17
1916	39
1917	38
1918	32
1919	63
1920	29
1921	32
1922	19
1923	29
1924	40
1925	29
1926	33
1927	15
1928	32
1929	23
1931	2
1932	8
1933	7
1934	37
1935	34
1936	58
1937	22
1938	17
1939	12
1949	22
1950	36
1951	45
1952	16
1953	20
1954	45
1955	21
1956	27
1957	27
1958	15
1959	24
1960	10
1961	39
1962	25
1963	34
1964	26
1965	28
1966	21
1967	16
1968	26
1969	20
1970	20
1971	18
1972	17
1973	13
1974	2

Wettest Day of Each Month

Aug: 154.2 mm (6.1 in)

The wettest day on record for each calendar month at Red Deer. The most was 154.2 mm (6.1 in) on 7 August 1938.

Record daily precipitation for each month at Red Deer
Month	Record daily precipitation (mm)	Date
Jan	22.9 mm (0.9 in)	31 January 1910
Feb	20.3 mm (0.8 in)	29 February 1932
Mar	36.3 mm (1.4 in)	15 March 1927
Apr	62.5 mm (2.5 in)	30 April 1951
May	59.4 mm (2.3 in)	11 May 1954
Jun	86.4 mm (3.4 in)	19 June 1935
Jul	122.7 mm (4.8 in)	15 July 1937
Aug	154.2 mm (6.1 in)	7 August 1938
Sep	48.3 mm (1.9 in)	22 September 1937
Oct	37.3 mm (1.5 in)	2 October 1915
Nov	21.6 mm (0.9 in)	30 November 1972
Dec	35.6 mm (1.4 in)	15 December 1924

Period of Record Coverage

1904 to 1974

57 years of record at Red Deer, 1904 to 1974. 17 years have data for under 90 percent of days and are left out of rankings: 1904, 1905, 1906, 1910, 1911, 1923, 1929, 1931 and others.

Days with data per year at Red Deer
Year	Days with data	Share of year	Complete
1904	111	30%	No
1905	92	25%	No
1906	119	33%	No
1909	346	95%	Yes
1910	302	83%	No
1911	195	53%	No
1914	365	100%	Yes
1915	365	100%	Yes
1916	365	100%	Yes
1917	365	100%	Yes
1918	365	100%	Yes
1919	365	100%	Yes
1920	365	100%	Yes
1921	365	100%	Yes
1922	350	96%	Yes
1923	272	75%	No
1924	366	100%	Yes
1925	364	100%	Yes
1926	365	100%	Yes
1927	361	99%	Yes
1928	365	100%	Yes
1929	150	41%	No
1931	61	17%	No
1932	120	33%	No
1933	118	32%	No
1934	335	92%	Yes
1935	365	100%	Yes
1936	366	100%	Yes
1937	365	100%	Yes
1938	365	100%	Yes
1939	90	25%	No
1949	214	59%	No
1950	304	83%	No
1951	365	100%	Yes
1952	366	100%	Yes
1953	365	100%	Yes
1954	365	100%	Yes
1955	364	100%	Yes
1956	365	100%	Yes
1957	365	100%	Yes
1958	365	100%	Yes
1959	365	100%	Yes
1960	275	75%	No
1961	363	99%	Yes
1962	364	100%	Yes
1963	364	100%	Yes
1964	335	92%	Yes
1965	364	100%	Yes
1966	333	91%	Yes
1967	335	92%	Yes
1968	304	83%	No
1969	365	100%	Yes
1970	365	100%	Yes
1971	242	66%	No
1972	335	92%	Yes
1973	365	100%	Yes
1974	92	25%	No

Latest Records

Latest records at Red Deer
Date	Station	Record	Value	Beat old record by	Old record stood	Significance
26 April 1974	Red Deer, CA	monthly high min (Tie)	10.0 C (50.0 F)	tie	21 years	5 of 100 (Routine)
24 April 1974	Red Deer, CA	daily high min	6.7 C (44.1 F)	1.7 C (3.1 F)	47 years	24 of 100 (Routine)
22 April 1974	Red Deer, CA	daily high max (Tie)	18.9 C (66.0 F)	tie	12 years	2 of 100 (Routine)
24 March 1974	Red Deer, CA	daily rain (Tie)	7.6 mm (0.30 in)	tie	60 years	6 of 100 (Routine)
24 March 1974	Red Deer, CA	daily snowfall (Tie)	7.6 cm (3.0 in)	tie	60 years	6 of 100 (Routine)
22 March 1974	Red Deer, CA	daily low min (Tie)	-26.1 C (-15.0 F)	tie	3 years	1 of 100 (Routine)
20 March 1974	Red Deer, CA	daily snowfall	3.8 cm (1.5 in)	0.5 cm (0.2 in)	9 years	10 of 100 (Routine)
17 March 1974	Red Deer, CA	daily rain	15.2 mm (0.6 in)	10.1 mm (0.4 in)	60 years	20 of 100 (Routine)
17 March 1974	Red Deer, CA	daily snowfall	15.2 cm (6.0 in)	10.1 cm (4.0 in)	60 years	50 of 100 (Notable)
16 March 1974	Red Deer, CA	daily rain	5.1 mm (0.20 in)	1.3 mm (0.05 in)	7 years	12 of 100 (Routine)
16 March 1974	Red Deer, CA	daily snowfall	5.1 cm (2.0 in)	1.3 cm (0.5 in)	7 years	12 of 100 (Routine)
25 January 1974	Red Deer, CA	daily high min	-2.8 C (27.0 F)	6.1 C (11.0 F)	64 years	32 of 100 (Routine)
25 January 1974	Red Deer, CA	daily rain	7.9 mm (0.31 in)	0.3 mm (0.01 in)	39 years	18 of 100 (Routine)
25 January 1974	Red Deer, CA	daily snowfall	7.9 cm (3.1 in)	0.3 cm (0.1 in)	39 years	18 of 100 (Routine)
8 November 1973	Red Deer, CA	daily low max	-13.9 C (7.0 F)	2.2 C (4.0 F)	48 years	23 of 100 (Routine)
7 November 1973	Red Deer, CA	daily low max	-16.7 C (1.9 F)	4.5 C (8.1 F)	54 years	28 of 100 (Routine)
6 November 1973	Red Deer, CA	daily low max	-13.9 C (7.0 F)	1.7 C (3.1 F)	54 years	25 of 100 (Routine)
5 November 1973	Red Deer, CA	daily low max	-13.9 C (7.0 F)	1.7 C (3.1 F)	36 years	20 of 100 (Routine)
23 September 1973	Red Deer, CA	daily high min	8.9 C (48.0 F)	0.6 C (1.1 F)	10 years	11 of 100 (Routine)
15 September 1973	Red Deer, CA	daily low min (Tie)	-3.9 C (25.0 F)	tie	67 years	6 of 100 (Routine)

Climate Trend

31 complete years, 1914 to 1973

One stripe for each of 31 complete years at Red Deer, 1914 to 1973. Blue stripes are years cooler than the station's own mean of 2.3 C (36.2 F); red stripes are warmer. The coolest year was 1951, at 0.2 C (32.3 F), and the warmest was 1963, at 4.3 C (39.7 F). The strongest colour marks a difference of 2.2 C (4.0 F).

Annual mean temperature at Red Deer as warming stripes, 1914 to 1973
Year	Annual mean temperature	Difference from the station mean
1914	1.9 C	-0.49 C
1915	2.8 C	+0.43 C
1916	0.4 C	-1.96 C
1917	1.1 C	-1.29 C
1918	2.4 C	+0.09 C
1920	1.5 C	-0.86 C
1921	1.8 C	-0.52 C
1924	2.1 C	-0.24 C
1925	2.5 C	+0.18 C
1926	3.3 C	+0.99 C
1927	0.6 C	-1.72 C
1928	3.9 C	+1.60 C
1935	1.1 C	-1.28 C
1936	1.4 C	-0.90 C
1937	1.7 C	-0.67 C
1938	3.4 C	+1.03 C
1951	0.2 C	-2.18 C
1952	3.0 C	+0.65 C
1953	3.8 C	+1.45 C
1954	2.2 C	-0.12 C
1955	0.9 C	-1.47 C
1956	2.5 C	+0.13 C
1957	2.9 C	+0.53 C
1958	3.7 C	+1.36 C
1961	3.9 C	+1.56 C
1962	3.9 C	+1.57 C
1963	4.3 C	+1.94 C
1965	2.0 C	-0.36 C
1969	2.2 C	-0.13 C
1970	2.5 C	+0.19 C
1973	3.0 C	+0.64 C

The annual mean temperature here has risen by 0.22 C (0.01 to 0.42) per decade over 1914 to 1973. In Fahrenheit: 0.39 F (0.02 to 0.76) per decade. The slope is a straight line fitted to 31 complete years; the brackets give its 95 percent interval.

Fitted temperature trends per decade at Red Deer
Measure	Per decade (C)	Per decade (F)	Period	Complete years	Reading
Annual mean temperature	0.22 C (0.01 to 0.42) per decade	0.39 F (0.02 to 0.76) per decade	1914 to 1973	31	Rise
Mean daily maximum	-0.04 C (-0.27 to 0.18) per decade	-0.1 F (-0.5 to 0.3) per decade	1914 to 1973	31	Not clearly different from zero
Mean daily minimum	0.5 C (0.3 to 0.7) per decade	0.9 F (0.5 to 1.2) per decade	1914 to 1973	31	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

1904 to 1974

Yearly extremes at Red Deer: the record and the median year
Measure	Record	Year of the record	Median year	Years with a value
Hottest day (TXx)	37.2 C (99.0 F)	1906	31.7 C (89.1 F)	57
Coldest night (TNn)	-50.6 C (-59.1 F)	1924	-37.8 C (-36.0 F)	57
Wettest day (Rx1day)	154.2 mm (6.1 in)	1938	32.5 mm (1.3 in)	57
Wettest five days (Rx5day)	187.8 mm (7.4 in)	1938	55.9 mm (2.2 in)	57
Longest dry spell (CDD)	70 days	1923	28 days	57

Hottest day (TXx)

The hottest day of the year at Red Deer, 1904 to 1974. The record is 37.2 C (99.0 F) in 1906, marked on the chart; the median year is 31.7 C (89.1 F).

Hottest day (TXx) at Red Deer by year
Year	Hottest day (TXx)
1904	36.1 C (97.0 F)
1905	28.9 C (84.0 F)
1906	37.2 C (99.0 F)
1909	31.1 C (88.0 F)
1910	32.2 C (90.0 F)
1911	28.9 C (84.0 F)
1914	32.2 C (90.0 F)
1915	30.0 C (86.0 F)
1916	28.3 C (82.9 F)
1917	30.0 C (86.0 F)
1918	32.8 C (91.0 F)
1919	32.8 C (91.0 F)
1920	33.3 C (91.9 F)
1921	34.4 C (93.9 F)
1922	34.4 C (93.9 F)
1923	30.6 C (87.1 F)
1924	37.2 C (99.0 F)
1925	33.9 C (93.0 F)
1926	35.0 C (95.0 F)
1927	30.6 C (87.1 F)
1928	32.2 C (90.0 F)
1929	26.1 C (79.0 F)
1931	13.9 C (57.0 F)
1932	15.6 C (60.1 F)
1933	12.2 C (54.0 F)
1934	34.4 C (93.9 F)
1935	34.4 C (93.9 F)
1936	35.6 C (96.1 F)
1937	37.2 C (99.0 F)
1938	35.0 C (95.0 F)
1939	15.0 C (59.0 F)
1949	32.8 C (91.0 F)
1950	31.7 C (89.1 F)
1951	31.1 C (88.0 F)
1952	30.6 C (87.1 F)
1953	31.1 C (88.0 F)
1954	31.7 C (89.1 F)
1955	31.7 C (89.1 F)
1956	31.7 C (89.1 F)
1957	30.6 C (87.1 F)
1958	31.7 C (89.1 F)
1959	34.4 C (93.9 F)
1960	30.0 C (86.0 F)
1961	34.4 C (93.9 F)
1962	31.7 C (89.1 F)
1963	30.6 C (87.1 F)
1964	33.3 C (91.9 F)
1965	31.7 C (89.1 F)
1966	32.2 C (90.0 F)
1967	32.8 C (91.0 F)
1968	30.0 C (86.0 F)
1969	32.2 C (90.0 F)
1970	32.8 C (91.0 F)
1971	33.3 C (91.9 F)
1972	31.7 C (89.1 F)
1973	31.7 C (89.1 F)
1974	22.2 C (72.0 F)

Coldest night (TNn)

The coldest night of the year at Red Deer, 1904 to 1974. The record is -50.6 C (-59.1 F) in 1924, marked on the chart; the median year is -37.8 C (-36.0 F).

Coldest night (TNn) at Red Deer by year
Year	Coldest night (TNn)
1904	-11.7 C (10.9 F)
1905	-6.1 C (21.0 F)
1906	-6.7 C (19.9 F)
1909	-42.2 C (-44.0 F)
1910	-40.0 C (-40.0 F)
1911	-13.9 C (7.0 F)
1914	-40.0 C (-40.0 F)
1915	-32.8 C (-27.0 F)
1916	-46.1 C (-51.0 F)
1917	-46.7 C (-52.1 F)
1918	-42.8 C (-45.0 F)
1919	-40.0 C (-40.0 F)
1920	-46.1 C (-51.0 F)
1921	-37.8 C (-36.0 F)
1922	-41.7 C (-43.1 F)
1923	-41.7 C (-43.1 F)
1924	-50.6 C (-59.1 F)
1925	-35.6 C (-32.1 F)
1926	-36.7 C (-34.1 F)
1927	-42.2 C (-44.0 F)
1928	-40.6 C (-41.1 F)
1929	-46.7 C (-52.1 F)
1931	-31.1 C (-24.0 F)
1932	-44.4 C (-47.9 F)
1933	-35.0 C (-31.0 F)
1934	-37.2 C (-35.0 F)
1935	-46.7 C (-52.1 F)
1936	-43.9 C (-47.0 F)
1937	-40.0 C (-40.0 F)
1938	-37.8 C (-36.0 F)
1939	-42.2 C (-44.0 F)
1949	-16.1 C (3.0 F)
1950	-44.4 C (-47.9 F)
1951	-40.6 C (-41.1 F)
1952	-37.2 C (-35.0 F)
1953	-30.6 C (-23.1 F)
1954	-41.1 C (-42.0 F)
1955	-35.6 C (-32.1 F)
1956	-39.4 C (-38.9 F)
1957	-37.2 C (-35.0 F)
1958	-36.7 C (-34.1 F)
1959	-33.3 C (-27.9 F)
1960	-37.2 C (-35.0 F)
1961	-35.0 C (-31.0 F)
1962	-36.1 C (-33.0 F)
1963	-35.6 C (-32.1 F)
1964	-38.9 C (-38.0 F)
1965	-35.0 C (-31.0 F)
1966	-37.8 C (-36.0 F)
1967	-31.7 C (-25.1 F)
1968	-35.0 C (-31.0 F)
1969	-42.2 C (-44.0 F)
1970	-40.0 C (-40.0 F)
1971	-35.6 C (-32.1 F)
1972	-41.7 C (-43.1 F)
1973	-31.1 C (-24.0 F)
1974	-36.7 C (-34.1 F)

Wettest day (Rx1day)

The wettest day of the year at Red Deer, 1904 to 1974. The record is 154.2 mm (6.1 in) in 1938, marked on the chart; the median year is 32.5 mm (1.3 in).

Wettest day (Rx1day) at Red Deer by year
Year	Wettest day (Rx1day)
1904	63.5 mm (2.5 in)
1905	33.3 mm (1.3 in)
1906	26.9 mm (1.1 in)
1909	28.7 mm (1.1 in)
1910	25.4 mm (1.0 in)
1911	32.0 mm (1.3 in)
1914	43.2 mm (1.7 in)
1915	53.6 mm (2.1 in)
1916	66.0 mm (2.6 in)
1917	22.9 mm (0.9 in)
1918	29.2 mm (1.1 in)
1919	29.2 mm (1.1 in)
1920	19.1 mm (0.8 in)
1921	25.7 mm (1.0 in)
1922	17.0 mm (0.7 in)
1923	36.3 mm (1.4 in)
1924	63.0 mm (2.5 in)
1925	19.6 mm (0.8 in)
1926	41.4 mm (1.6 in)
1927	36.3 mm (1.4 in)
1928	57.2 mm (2.3 in)
1929	12.7 mm (0.5 in)
1931	12.7 mm (0.5 in)
1932	20.3 mm (0.8 in)
1933	12.7 mm (0.5 in)
1934	52.8 mm (2.1 in)
1935	86.4 mm (3.4 in)
1936	44.7 mm (1.8 in)
1937	122.7 mm (4.8 in)
1938	154.2 mm (6.1 in)
1939	10.2 mm (0.4 in)
1949	80.8 mm (3.2 in)
1950	24.6 mm (1.0 in)
1951	62.5 mm (2.5 in)
1952	26.9 mm (1.1 in)
1953	53.1 mm (2.1 in)
1954	60.5 mm (2.4 in)
1955	29.2 mm (1.1 in)
1956	37.1 mm (1.5 in)
1957	22.9 mm (0.9 in)
1958	28.2 mm (1.1 in)
1959	58.2 mm (2.3 in)
1960	34.8 mm (1.4 in)
1961	25.9 mm (1.0 in)
1962	32.5 mm (1.3 in)
1963	37.1 mm (1.5 in)
1964	37.6 mm (1.5 in)
1965	24.6 mm (1.0 in)
1966	25.9 mm (1.0 in)
1967	20.6 mm (0.8 in)
1968	52.6 mm (2.1 in)
1969	37.3 mm (1.5 in)
1970	72.4 mm (2.9 in)
1971	16.5 mm (0.6 in)
1972	30.0 mm (1.2 in)
1973	36.6 mm (1.4 in)
1974	15.2 mm (0.6 in)

Wettest five days (Rx5day)

The wettest five days of the year at Red Deer, 1904 to 1974. The record is 187.8 mm (7.4 in) in 1938, marked on the chart; the median year is 55.9 mm (2.2 in).

Wettest five days (Rx5day) at Red Deer by year
Year	Wettest five days (Rx5day)
1904	63.8 mm (2.5 in)
1905	49.5 mm (1.9 in)
1906	26.9 mm (1.1 in)
1909	37.6 mm (1.5 in)
1910	55.9 mm (2.2 in)
1911	51.8 mm (2.0 in)
1914	144.8 mm (5.7 in)
1915	68.3 mm (2.7 in)
1916	71.1 mm (2.8 in)
1917	27.5 mm (1.1 in)
1918	32.3 mm (1.3 in)
1919	53.3 mm (2.1 in)
1920	35.6 mm (1.4 in)
1921	47.0 mm (1.9 in)
1922	43.2 mm (1.7 in)
1923	67.5 mm (2.7 in)
1924	95.8 mm (3.8 in)
1925	46.0 mm (1.8 in)
1926	87.1 mm (3.4 in)
1927	58.7 mm (2.3 in)
1928	103.3 mm (4.1 in)
1929	12.7 mm (0.5 in)
1931	12.7 mm (0.5 in)
1932	25.4 mm (1.0 in)
1933	20.3 mm (0.8 in)
1934	92.3 mm (3.6 in)
1935	107.7 mm (4.2 in)
1936	51.9 mm (2.0 in)
1937	146.0 mm (5.7 in)
1938	187.8 mm (7.4 in)
1939	15.8 mm (0.6 in)
1949	95.8 mm (3.8 in)
1950	63.5 mm (2.5 in)
1951	90.3 mm (3.6 in)
1952	61.4 mm (2.4 in)
1953	67.6 mm (2.7 in)
1954	115.6 mm (4.6 in)
1955	51.1 mm (2.0 in)
1956	77.5 mm (3.1 in)
1957	34.1 mm (1.3 in)
1958	77.6 mm (3.1 in)
1959	64.8 mm (2.6 in)
1960	63.5 mm (2.5 in)
1961	39.6 mm (1.6 in)
1962	49.9 mm (2.0 in)
1963	41.3 mm (1.6 in)
1964	52.4 mm (2.1 in)
1965	47.2 mm (1.9 in)
1966	32.8 mm (1.3 in)
1967	45.8 mm (1.8 in)
1968	87.9 mm (3.5 in)
1969	65.2 mm (2.6 in)
1970	115.1 mm (4.5 in)
1971	49.6 mm (2.0 in)
1972	70.7 mm (2.8 in)
1973	66.0 mm (2.6 in)
1974	25.3 mm (1.0 in)

Longest dry spell (CDD)

The longest dry spell of the year at Red Deer, 1904 to 1974. The record is 70 days in 1923, marked on the chart; the median year is 28 days.

Longest dry spell (CDD) at Red Deer by year
Year	Longest dry spell (CDD)
1904	24 days
1905	15 days
1906	21 days
1909	21 days
1910	29 days
1911	20 days
1914	30 days
1915	50 days
1916	30 days
1917	42 days
1918	39 days
1919	36 days
1920	20 days
1921	22 days
1922	21 days
1923	70 days
1924	24 days
1925	28 days
1926	26 days
1927	31 days
1928	47 days
1929	36 days
1931	33 days
1932	23 days
1933	21 days
1934	36 days
1935	25 days
1936	16 days
1937	30 days
1938	40 days
1939	18 days
1949	25 days
1950	21 days
1951	31 days
1952	43 days
1953	55 days
1954	52 days
1955	30 days
1956	18 days
1957	21 days
1958	31 days
1959	26 days
1960	30 days
1961	19 days
1962	38 days
1963	19 days
1964	30 days
1965	29 days
1966	40 days
1967	35 days
1968	22 days
1969	28 days
1970	16 days
1971	44 days
1972	23 days
1973	25 days
1974	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.

Frost Dates and Growing Season

31 years with a frost

Across 31 years with a frost, the median last spring frost at Red Deer falls on 28 May and the median first autumn frost on 4 September, which leaves a median of 100 days between them.

Fitted over all years, the growing season changes by +6.0 days per decade at this station.

Frost dates and growing season at Red Deer
Measure	Median, all years	Earliest period	Recent period (1915 to 1973)	Recent against earliest	Fitted trend
Last spring frost	28 May	n/a	28 May	n/a	-2.8 days per decade
First autumn frost	4 September	n/a	5 September	n/a	+3.2 days per decade
Growing days	100 days	n/a	101 days	n/a	+6.0 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

40 years, 1909 to 1973

A day with at least 36.4 mm (1.4 in) of rain is expected about once in 2 years. A day with at least 163.0 mm (6.4 in) of rain is expected about once in 100 years.

Rainfall return levels at Red Deer: the daily rain expected about once in a given number of years
Expected about once in	A day with at least	Note
2 years	36.4 mm (1.4 in)
5 years	56.6 mm (2.2 in)
10 years	74.2 mm (2.9 in)
25 years	102.8 mm (4.0 in)
50 years	129.9 mm (5.1 in)	Longer than the 40 years of record
100 years	163.0 mm (6.4 in)	Longer than the 40 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, 40 years of values from 1909 to 1973.

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: 154.2 mm (6.1 in) in 1938; 122.7 mm (4.8 in) in 1937; 86.4 mm (3.4 in) in 1935.

Download the Data

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