Three Hills Weather Records (CA003026480)

Record envelope, standing records and threshold days for Three Hills (CA003026480), Alberta, Canada, with 58 years of record.

Key Facts for Three Hills

Three Hills (CA003026480) is a weather station in Alberta, Canada at 51.65 latitude and -113.30 longitude, 841 m (2,759 ft) above sea level.
The station reports from 1921 to 1978, 58 years of record.
1,464 records set at Three Hills still stand.
Records are tracked for tmax, tmin, prcp, snow: an element needs 30 years of data to be eligible.
Three Hills set a daily record precipitation of 11.2 mm (0.4 in) on 24 January 1978.

About the Station

Location: Alberta, Canada, 51.65 latitude, -113.30 longitude.
Elevation: 841 m (2,759 ft).
Period of record: 1921 to 1978, 58 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 Three Hills. 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 Three Hills, 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)	-48.3 C (-54.9 F)	n/a	n/a
Feb	17.2 C (63.0 F)	-47.2 C (-53.0 F)	n/a	n/a
Mar	23.9 C (75.0 F)	-42.8 C (-45.0 F)	n/a	n/a
Apr	30.6 C (87.1 F)	-24.4 C (-11.9 F)	n/a	n/a
May	34.4 C (93.9 F)	-15.0 C (5.0 F)	n/a	n/a
Jun	36.7 C (98.1 F)	-7.2 C (19.0 F)	n/a	n/a
Jul	40.0 C (104.0 F)	-1.7 C (28.9 F)	n/a	n/a
Aug	37.8 C (100.0 F)	-5.0 C (23.0 F)	n/a	n/a
Sep	37.2 C (99.0 F)	-15.0 C (5.0 F)	n/a	n/a
Oct	30.6 C (87.1 F)	-28.9 C (-20.0 F)	n/a	n/a
Nov	23.3 C (73.9 F)	-37.8 C (-36.0 F)	n/a	n/a
Dec	17.8 C (64.0 F)	-48.3 C (-54.9 F)	n/a	n/a

Which Years Hold Standing Records

1,464 standing records

1,464 records at Three Hills still stand. 1936 holds the most, with 59.

Standing records at Three Hills by the year they were set
Year set	Standing records
1921	23
1922	19
1923	28
1924	27
1925	22
1926	31
1927	19
1928	32
1929	35
1930	35
1931	35
1932	19
1933	22
1934	43
1935	20
1936	59
1937	19
1938	9
1939	39
1940	16
1941	17
1942	23
1943	29
1944	17
1945	16
1946	21
1947	18
1948	18
1949	29
1950	37
1951	37
1952	14
1953	21
1954	44
1955	24
1956	38
1957	20
1958	17
1959	31
1960	14
1961	26
1962	19
1963	33
1964	19
1965	30
1966	23
1967	25
1968	37
1969	27
1970	34
1971	20
1972	27
1973	13
1974	18
1975	23
1976	21
1977	32

All-Time Record Progression

1 new records

1 all-time records were set at Three Hills between 2 July 1966 and 2 July 1966. Each dot is a new record.

Wettest Day of Each Month

Jul: 75.9 mm (3.0 in)

The wettest day on record for each calendar month at Three Hills. The most was 75.9 mm (3.0 in) on 2 July 1966.

Record daily precipitation for each month at Three Hills
Month	Record daily precipitation (mm)	Date
Jan	16.3 mm (0.6 in)	30 January 1971
Feb	17.8 mm (0.7 in)	13 February 1926
Mar	23.4 mm (0.9 in)	10 March 1976
Apr	68.8 mm (2.7 in)	21 April 1932
May	59.4 mm (2.3 in)	27 May 1961
Jun	55.1 mm (2.2 in)	24 June 1939
Jul	75.9 mm (3.0 in)	2 July 1966
Aug	62.5 mm (2.5 in)	22 August 1947
Sep	39.1 mm (1.5 in)	20 September 1945
Oct	35.6 mm (1.4 in)	23 October 1943
Nov	18.3 mm (0.7 in)	30 November 1972
Dec	21.3 mm (0.8 in)	20 December 1966

Period of Record Coverage

1921 to 1978

58 years of record at Three Hills, 1921 to 1978. 3 years have data for under 90 percent of days and are left out of rankings: 1963, 1964, 1978.

Days with data per year at Three Hills
Year	Days with data	Share of year	Complete
1921	334	92%	Yes
1922	355	97%	Yes
1923	340	93%	Yes
1924	366	100%	Yes
1925	365	100%	Yes
1926	365	100%	Yes
1927	365	100%	Yes
1928	336	92%	Yes
1929	364	100%	Yes
1930	365	100%	Yes
1931	365	100%	Yes
1932	365	100%	Yes
1933	365	100%	Yes
1934	365	100%	Yes
1935	363	99%	Yes
1936	366	100%	Yes
1937	365	100%	Yes
1938	365	100%	Yes
1939	365	100%	Yes
1940	366	100%	Yes
1941	365	100%	Yes
1942	364	100%	Yes
1943	364	100%	Yes
1944	366	100%	Yes
1945	365	100%	Yes
1946	364	100%	Yes
1947	365	100%	Yes
1948	366	100%	Yes
1949	365	100%	Yes
1950	365	100%	Yes
1951	365	100%	Yes
1952	366	100%	Yes
1953	365	100%	Yes
1954	365	100%	Yes
1955	365	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	351	96%	Yes
1963	303	83%	No
1964	273	75%	No
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	366	100%	Yes
1973	365	100%	Yes
1974	365	100%	Yes
1975	359	98%	Yes
1976	366	100%	Yes
1977	361	99%	Yes
1978	59	16%	No

Latest Records

Latest records at Three Hills
Date	Station	Record	Value	Beat old record by	Old record stood	Significance
24 January 1978	Three Hills, CA	daily rain	11.2 mm (0.4 in)	1.0 mm (0.04 in)	27 years	17 of 100 (Routine)
24 January 1978	Three Hills, CA	daily snowfall	11.2 cm (4.4 in)	1.0 cm (0.4 in)	27 years	17 of 100 (Routine)
14 January 1978	Three Hills, CA	daily rain	4.1 mm (0.16 in)	0.3 mm (0.01 in)	38 years	17 of 100 (Routine)
14 January 1978	Three Hills, CA	daily snowfall	4.1 cm (1.6 in)	0.3 cm (0.1 in)	38 years	17 of 100 (Routine)
10 December 1977	Three Hills, CA	daily low min	-35.0 C (-31.0 F)	1.1 C (2.0 F)	16 years	10 of 100 (Routine)
9 December 1977	Three Hills, CA	daily low min	-46.7 C (-52.1 F)	8.9 C (16.0 F)	50 years	29 of 100 (Routine)
9 December 1977	Three Hills, CA	daily low max	-32.8 C (-27.0 F)	8.4 C (15.1 F)	40 years	25 of 100 (Routine)
8 December 1977	Three Hills, CA	daily low max	-35.0 C (-31.0 F)	3.9 C (7.0 F)	50 years	23 of 100 (Routine)
6 December 1977	Three Hills, CA	daily rain	9.4 mm (0.37 in)	5.6 mm (0.22 in)	14 years	20 of 100 (Routine)
6 December 1977	Three Hills, CA	daily snowfall	9.4 cm (3.7 in)	5.6 cm (2.2 in)	14 years	28 of 100 (Routine)
2 December 1977	Three Hills, CA	daily rain (Tie)	12.7 mm (0.5 in)	tie	20 years	2 of 100 (Routine)
2 December 1977	Three Hills, CA	daily snowfall (Tie)	12.7 cm (5.0 in)	tie	20 years	2 of 100 (Routine)
25 November 1977	Three Hills, CA	daily rain	10.2 mm (0.4 in)	2.6 mm (0.10 in)	51 years	20 of 100 (Routine)
25 November 1977	Three Hills, CA	daily snowfall	10.2 cm (4.0 in)	2.6 cm (1.0 in)	51 years	27 of 100 (Routine)
24 November 1977	Three Hills, CA	daily low min (Tie)	-31.1 C (-24.0 F)	tie	56 years	5 of 100 (Routine)
7 November 1977	Three Hills, CA	daily high min	-2.2 C (28.0 F)	1.1 C (2.0 F)	42 years	18 of 100 (Routine)
16 October 1977	Three Hills, CA	daily high min	6.7 C (44.1 F)	0.6 C (1.1 F)	40 years	18 of 100 (Routine)
14 September 1977	Three Hills, CA	daily rain	21.8 mm (0.9 in)	9.1 mm (0.36 in)	22 years	20 of 100 (Routine)
21 August 1977	Three Hills, CA	daily low max (Tie)	14.4 C (57.9 F)	tie	3 years	1 of 100 (Routine)
15 August 1977	Three Hills, CA	daily low min (Tie)	-0.6 C (30.9 F)	tie	36 years	4 of 100 (Routine)

Climate Trend

47 complete years, 1922 to 1977

One stripe for each of 47 complete years at Three Hills, 1922 to 1977. Blue stripes are years cooler than the station's own mean of 2.0 C (35.5 F); red stripes are warmer. The coolest year was 1951, at -0.4 C (31.2 F), and the warmest was 1931, at 4.1 C (39.3 F). The strongest colour marks a difference of 2.4 C (4.3 F).

Annual mean temperature at Three Hills as warming stripes, 1922 to 1977
Year	Annual mean temperature	Difference from the station mean
1922	0.6 C	-1.36 C
1924	1.8 C	-0.16 C
1925	2.2 C	+0.23 C
1926	2.9 C	+0.98 C
1927	0.1 C	-1.89 C
1929	1.9 C	-0.07 C
1930	3.6 C	+1.67 C
1931	4.1 C	+2.09 C
1932	1.9 C	-0.09 C
1933	2.0 C	+0.08 C
1934	3.4 C	+1.39 C
1935	0.5 C	-1.43 C
1936	1.0 C	-0.98 C
1937	1.3 C	-0.62 C
1938	2.2 C	+0.24 C
1939	2.5 C	+0.57 C
1940	1.8 C	-0.16 C
1941	3.5 C	+1.49 C
1942	2.5 C	+0.50 C
1943	2.2 C	+0.25 C
1944	3.5 C	+1.51 C
1945	1.1 C	-0.87 C
1946	2.5 C	+0.52 C
1947	2.5 C	+0.49 C
1948	1.4 C	-0.60 C
1949	2.2 C	+0.22 C
1950	0.1 C	-1.84 C
1951	-0.4 C	-2.38 C
1952	2.2 C	+0.26 C
1953	3.4 C	+1.47 C
1954	1.9 C	-0.08 C
1955	0.5 C	-1.42 C
1956	1.6 C	-0.38 C
1957	2.6 C	+0.65 C
1958	3.2 C	+1.21 C
1959	2.3 C	+0.30 C
1960	2.2 C	+0.21 C
1961	3.2 C	+1.19 C
1965	0.9 C	-1.05 C
1966	0.9 C	-1.03 C
1967	1.6 C	-0.32 C
1968	2.6 C	+0.60 C
1969	1.3 C	-0.63 C
1970	1.6 C	-0.32 C
1972	0.8 C	-1.12 C
1973	2.2 C	+0.19 C
1977	2.4 C	+0.46 C

The fitted trend in annual mean temperature here over 1922 to 1977 is -0.1 C (-0.3 to 0.1) per decade. The interval includes zero, so the trend is not clearly different from zero. In Fahrenheit: -0.1 F (-0.5 to 0.3) per decade. The slope is a straight line fitted to 47 complete years; the brackets give its 95 percent interval.

Fitted temperature trends per decade at Three Hills
Measure	Per decade (C)	Per decade (F)	Period	Complete years	Reading
Annual mean temperature	-0.1 C (-0.3 to 0.1) per decade	-0.1 F (-0.5 to 0.3) per decade	1922 to 1977	47	Not clearly different from zero
Mean daily maximum	-0.1 C (-0.4 to 0.1) per decade	-0.3 F (-0.7 to 0.2) per decade	1922 to 1977	47	Not clearly different from zero
Mean daily minimum	0.03 C (-0.14 to 0.21) per decade	0.1 F (-0.3 to 0.4) per decade	1922 to 1977	47	Not clearly different from zero

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

1921 to 1978

Yearly extremes at Three Hills: 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)	1930	34.4 C (93.9 F)	58
Coldest night (TNn)	-48.3 C (-54.9 F)	1924	-39.7 C (-39.5 F)	58
Wettest day (Rx1day)	75.9 mm (3.0 in)	1966	33.5 mm (1.3 in)	58
Wettest five days (Rx5day)	114.0 mm (4.5 in)	1928	53.6 mm (2.1 in)	58
Longest dry spell (CDD)	95 days	1923	33 days	58

Hottest day (TXx)

The hottest day of the year at Three Hills, 1921 to 1978. The record is 40.0 C (104.0 F) in 1930, marked on the chart; the median year is 34.4 C (93.9 F).

Hottest day (TXx) at Three Hills by year
Year	Hottest day (TXx)
1921	38.3 C (100.9 F)
1922	32.2 C (90.0 F)
1923	33.9 C (93.0 F)
1924	36.7 C (98.1 F)
1925	35.6 C (96.1 F)
1926	37.2 C (99.0 F)
1927	33.3 C (91.9 F)
1928	35.0 C (95.0 F)
1929	37.8 C (100.0 F)
1930	40.0 C (104.0 F)
1931	31.7 C (89.1 F)
1932	33.3 C (91.9 F)
1933	37.2 C (99.0 F)
1934	36.7 C (98.1 F)
1935	34.4 C (93.9 F)
1936	37.2 C (99.0 F)
1937	36.7 C (98.1 F)
1938	35.0 C (95.0 F)
1939	34.4 C (93.9 F)
1940	32.2 C (90.0 F)
1941	36.1 C (97.0 F)
1942	33.9 C (93.0 F)
1943	32.8 C (91.0 F)
1944	34.4 C (93.9 F)
1945	35.0 C (95.0 F)
1946	35.0 C (95.0 F)
1947	34.4 C (93.9 F)
1948	32.8 C (91.0 F)
1949	33.9 C (93.0 F)
1950	33.9 C (93.0 F)
1951	32.2 C (90.0 F)
1952	31.7 C (89.1 F)
1953	32.8 C (91.0 F)
1954	32.8 C (91.0 F)
1955	33.3 C (91.9 F)
1956	34.4 C (93.9 F)
1957	32.8 C (91.0 F)
1958	33.9 C (93.0 F)
1959	35.0 C (95.0 F)
1960	36.7 C (98.1 F)
1961	36.7 C (98.1 F)
1962	33.9 C (93.0 F)
1963	32.8 C (91.0 F)
1964	33.3 C (91.9 F)
1965	33.9 C (93.0 F)
1966	32.8 C (91.0 F)
1967	37.2 C (99.0 F)
1968	35.0 C (95.0 F)
1969	34.4 C (93.9 F)
1970	35.0 C (95.0 F)
1971	36.1 C (97.0 F)
1972	33.9 C (93.0 F)
1973	34.4 C (93.9 F)
1974	36.1 C (97.0 F)
1975	37.8 C (100.0 F)
1976	32.2 C (90.0 F)
1977	35.0 C (95.0 F)
1978	7.2 C (45.0 F)

Coldest night (TNn)

The coldest night of the year at Three Hills, 1921 to 1978. The record is -48.3 C (-54.9 F) in 1924, marked on the chart; the median year is -39.7 C (-39.5 F).

Coldest night (TNn) at Three Hills by year
Year	Coldest night (TNn)
1921	-39.4 C (-38.9 F)
1922	-38.9 C (-38.0 F)
1923	-42.8 C (-45.0 F)
1924	-48.3 C (-54.9 F)
1925	-34.4 C (-29.9 F)
1926	-38.9 C (-38.0 F)
1927	-44.4 C (-47.9 F)
1928	-43.9 C (-47.0 F)
1929	-46.7 C (-52.1 F)
1930	-42.8 C (-45.0 F)
1931	-32.8 C (-27.0 F)
1932	-45.0 C (-49.0 F)
1933	-36.7 C (-34.1 F)
1934	-42.2 C (-44.0 F)
1935	-46.7 C (-52.1 F)
1936	-47.2 C (-53.0 F)
1937	-42.8 C (-45.0 F)
1938	-42.2 C (-44.0 F)
1939	-46.7 C (-52.1 F)
1940	-37.8 C (-36.0 F)
1941	-35.6 C (-32.1 F)
1942	-34.4 C (-29.9 F)
1943	-46.7 C (-52.1 F)
1944	-32.8 C (-27.0 F)
1945	-37.8 C (-36.0 F)
1946	-37.2 C (-35.0 F)
1947	-40.6 C (-41.1 F)
1948	-36.7 C (-34.1 F)
1949	-39.4 C (-38.9 F)
1950	-48.3 C (-54.9 F)
1951	-42.8 C (-45.0 F)
1952	-38.3 C (-36.9 F)
1953	-33.9 C (-29.0 F)
1954	-43.9 C (-47.0 F)
1955	-36.7 C (-34.1 F)
1956	-46.7 C (-52.1 F)
1957	-37.8 C (-36.0 F)
1958	-38.3 C (-36.9 F)
1959	-35.0 C (-31.0 F)
1960	-42.2 C (-44.0 F)
1961	-37.2 C (-35.0 F)
1962	-37.2 C (-35.0 F)
1963	-40.0 C (-40.0 F)
1964	-38.3 C (-36.9 F)
1965	-37.2 C (-35.0 F)
1966	-38.9 C (-38.0 F)
1967	-36.7 C (-34.1 F)
1968	-38.9 C (-38.0 F)
1969	-45.0 C (-49.0 F)
1970	-42.8 C (-45.0 F)
1971	-41.7 C (-43.1 F)
1972	-47.2 C (-53.0 F)
1973	-37.8 C (-36.0 F)
1974	-42.8 C (-45.0 F)
1975	-41.7 C (-43.1 F)
1976	-38.3 C (-36.9 F)
1977	-46.7 C (-52.1 F)
1978	-44.4 C (-47.9 F)

Wettest day (Rx1day)

The wettest day of the year at Three Hills, 1921 to 1978. The record is 75.9 mm (3.0 in) in 1966, marked on the chart; the median year is 33.5 mm (1.3 in).

Wettest day (Rx1day) at Three Hills by year
Year	Wettest day (Rx1day)
1921	17.8 mm (0.7 in)
1922	14.5 mm (0.6 in)
1923	45.0 mm (1.8 in)
1924	75.7 mm (3.0 in)
1925	29.7 mm (1.2 in)
1926	41.7 mm (1.6 in)
1927	24.4 mm (1.0 in)
1928	48.8 mm (1.9 in)
1929	15.2 mm (0.6 in)
1930	24.6 mm (1.0 in)
1931	40.9 mm (1.6 in)
1932	68.8 mm (2.7 in)
1933	24.4 mm (1.0 in)
1934	19.8 mm (0.8 in)
1935	38.1 mm (1.5 in)
1936	27.4 mm (1.1 in)
1937	23.9 mm (0.9 in)
1938	34.0 mm (1.3 in)
1939	55.1 mm (2.2 in)
1940	25.4 mm (1.0 in)
1941	44.5 mm (1.8 in)
1942	40.1 mm (1.6 in)
1943	35.6 mm (1.4 in)
1944	22.1 mm (0.9 in)
1945	46.2 mm (1.8 in)
1946	24.4 mm (1.0 in)
1947	62.5 mm (2.5 in)
1948	35.1 mm (1.4 in)
1949	44.7 mm (1.8 in)
1950	31.8 mm (1.3 in)
1951	42.7 mm (1.7 in)
1952	19.3 mm (0.8 in)
1953	42.7 mm (1.7 in)
1954	34.5 mm (1.4 in)
1955	23.4 mm (0.9 in)
1956	47.0 mm (1.9 in)
1957	41.4 mm (1.6 in)
1958	17.0 mm (0.7 in)
1959	25.1 mm (1.0 in)
1960	18.5 mm (0.7 in)
1961	59.4 mm (2.3 in)
1962	19.1 mm (0.8 in)
1963	51.8 mm (2.0 in)
1964	29.5 mm (1.2 in)
1965	35.6 mm (1.4 in)
1966	75.9 mm (3.0 in)
1967	15.7 mm (0.6 in)
1968	54.1 mm (2.1 in)
1969	30.5 mm (1.2 in)
1970	50.3 mm (2.0 in)
1971	20.1 mm (0.8 in)
1972	27.2 mm (1.1 in)
1973	45.0 mm (1.8 in)
1974	52.6 mm (2.1 in)
1975	27.2 mm (1.1 in)
1976	33.0 mm (1.3 in)
1977	21.8 mm (0.9 in)
1978	11.2 mm (0.4 in)

Wettest five days (Rx5day)

The wettest five days of the year at Three Hills, 1921 to 1978. The record is 114.0 mm (4.5 in) in 1928, marked on the chart; the median year is 53.6 mm (2.1 in).

Wettest five days (Rx5day) at Three Hills by year
Year	Wettest five days (Rx5day)
1921	31.7 mm (1.2 in)
1922	22.6 mm (0.9 in)
1923	55.4 mm (2.2 in)
1924	83.3 mm (3.3 in)
1925	45.0 mm (1.8 in)
1926	67.1 mm (2.6 in)
1927	55.9 mm (2.2 in)
1928	114.0 mm (4.5 in)
1929	26.7 mm (1.1 in)
1930	34.2 mm (1.3 in)
1931	56.1 mm (2.2 in)
1932	108.9 mm (4.3 in)
1933	28.8 mm (1.1 in)
1934	31.2 mm (1.2 in)
1935	67.1 mm (2.6 in)
1936	33.0 mm (1.3 in)
1937	53.9 mm (2.1 in)
1938	49.0 mm (1.9 in)
1939	81.0 mm (3.2 in)
1940	47.5 mm (1.9 in)
1941	71.9 mm (2.8 in)
1942	67.3 mm (2.6 in)
1943	48.3 mm (1.9 in)
1944	49.5 mm (1.9 in)
1945	60.0 mm (2.4 in)
1946	56.7 mm (2.2 in)
1947	66.1 mm (2.6 in)
1948	58.7 mm (2.3 in)
1949	50.3 mm (2.0 in)
1950	53.6 mm (2.1 in)
1951	67.1 mm (2.6 in)
1952	44.7 mm (1.8 in)
1953	57.1 mm (2.2 in)
1954	72.6 mm (2.9 in)
1955	54.7 mm (2.2 in)
1956	52.3 mm (2.1 in)
1957	98.9 mm (3.9 in)
1958	36.5 mm (1.4 in)
1959	44.7 mm (1.8 in)
1960	28.1 mm (1.1 in)
1961	84.3 mm (3.3 in)
1962	26.7 mm (1.1 in)
1963	59.7 mm (2.4 in)
1964	32.8 mm (1.3 in)
1965	56.5 mm (2.2 in)
1966	85.8 mm (3.4 in)
1967	26.4 mm (1.0 in)
1968	85.1 mm (3.4 in)
1969	38.6 mm (1.5 in)
1970	111.1 mm (4.4 in)
1971	38.9 mm (1.5 in)
1972	38.7 mm (1.5 in)
1973	65.9 mm (2.6 in)
1974	53.6 mm (2.1 in)
1975	42.2 mm (1.7 in)
1976	49.1 mm (1.9 in)
1977	27.4 mm (1.1 in)
1978	17.2 mm (0.7 in)

Longest dry spell (CDD)

The longest dry spell of the year at Three Hills, 1921 to 1978. The record is 95 days in 1923, marked on the chart; the median year is 33 days.

Longest dry spell (CDD) at Three Hills by year
Year	Longest dry spell (CDD)
1921	31 days
1922	33 days
1923	95 days
1924	24 days
1925	43 days
1926	38 days
1927	29 days
1928	51 days
1929	24 days
1930	43 days
1931	53 days
1932	43 days
1933	37 days
1934	43 days
1935	30 days
1936	25 days
1937	34 days
1938	35 days
1939	27 days
1940	41 days
1941	31 days
1942	33 days
1943	51 days
1944	42 days
1945	28 days
1946	34 days
1947	22 days
1948	35 days
1949	44 days
1950	32 days
1951	20 days
1952	35 days
1953	59 days
1954	47 days
1955	20 days
1956	35 days
1957	19 days
1958	31 days
1959	24 days
1960	26 days
1961	53 days
1962	29 days
1963	50 days
1964	31 days
1965	30 days
1966	28 days
1967	25 days
1968	23 days
1969	35 days
1970	24 days
1971	44 days
1972	26 days
1973	34 days
1974	41 days
1975	20 days
1976	52 days
1977	28 days
1978	18 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

47 years with a frost

Across 47 years with a frost, the median last spring frost at Three Hills falls on 10 June and the median first autumn frost on 22 August, which leaves a median of 73 days between them.

Fitted over all years, the growing season changes by +1.1 days per decade at this station.

Frost dates and growing season at Three Hills
Measure	Median, all years	Earliest period	Recent period (1941 to 1977)	Recent against earliest	Fitted trend
Last spring frost	10 June	n/a	13 June	n/a	-0.9 days per decade
First autumn frost	22 August	n/a	21 August	n/a	+0.3 days per decade
Growing days	73 days	n/a	73 days	n/a	+1.1 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

55 years, 1921 to 1977

A day with at least 33.2 mm (1.3 in) of rain is expected about once in 2 years. A day with at least 86.2 mm (3.4 in) of rain is expected about once in 100 years.

Rainfall return levels at Three Hills: the daily rain expected about once in a given number of years
Expected about once in	A day with at least	Note
2 years	33.2 mm (1.3 in)
5 years	47.5 mm (1.9 in)
10 years	56.9 mm (2.2 in)
25 years	68.7 mm (2.7 in)
50 years	77.5 mm (3.1 in)
100 years	86.2 mm (3.4 in)	Longer than the 55 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, 55 years of values from 1921 to 1977.

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: 75.9 mm (3.0 in) in 1966; 75.7 mm (3.0 in) in 1924; 68.8 mm (2.7 in) in 1932.

Station Changes

1 suspected

One change was suspected in the annual mean temperature of Three Hills, at 1947. Each is measured against neighbouring stations.

Relative to 5 neighbouring stations, the station's annual mean temperature from 1947 ran 0.3 C (0.5 F) higher than in the years before (possible change).

Suspected changes in the annual mean temperature at Three Hills, against neighbouring stations
Year	Shift (C)	Shift (F)	Strength	Neighbours
1947	+0.3	+0.5	possible	5

Possible change at the station (a move, a new instrument or a new site); the record is kept as measured. A "likely" change has a larger test statistic than a "possible" one. Neither says why the station differs from its neighbours. How changes are found, and the largest ones.

Download the Data

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