Brooks 1 Weather Records (CA003030840)

Record envelope, standing records and threshold days for Brooks 1 (CA003030840), Alberta, Canada, with 57 years of record.

Key Facts for Brooks 1

Brooks 1 (CA003030840) is a weather station in Alberta, Canada at 50.57 latitude and -111.90 longitude, 758 m (2,487 ft) above sea level.
The station reports from 1912 to 1968, 57 years of record.
1,464 records set at Brooks 1 still stand.
Records are tracked for tmax, tmin, prcp, snow: an element needs 30 years of data to be eligible.
Brooks 1 set a daily record precipitation of 9.4 mm (0.37 in) on 11 August 1968.

About the Station

Location: Alberta, Canada, 50.57 latitude, -111.90 longitude.
Elevation: 758 m (2,487 ft).
Period of record: 1912 to 1968, 57 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 Brooks 1. 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 Brooks 1, 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)	-45.6 C (-50.1 F)	n/a	n/a
Feb	18.3 C (64.9 F)	-41.7 C (-43.1 F)	n/a	n/a
Mar	25.0 C (77.0 F)	-40.6 C (-41.1 F)	n/a	n/a
Apr	31.1 C (88.0 F)	-24.4 C (-11.9 F)	n/a	n/a
May	33.9 C (93.0 F)	-11.1 C (12.0 F)	n/a	n/a
Jun	37.2 C (99.0 F)	-2.2 C (28.0 F)	n/a	n/a
Jul	38.9 C (102.0 F)	1.1 C (34.0 F)	n/a	n/a
Aug	37.8 C (100.0 F)	-1.1 C (30.0 F)	n/a	n/a
Sep	35.0 C (95.0 F)	-11.1 C (12.0 F)	n/a	n/a
Oct	33.3 C (91.9 F)	-23.3 C (-9.9 F)	n/a	n/a
Nov	24.4 C (75.9 F)	-33.3 C (-27.9 F)	n/a	n/a
Dec	20.0 C (68.0 F)	-39.4 C (-38.9 F)	n/a	n/a

Which Years Hold Standing Records

1,464 standing records

1,464 records at Brooks 1 still stand. 1954 holds the most, with 57.

Standing records at Brooks 1 by the year they were set
Year set	Standing records
1912	42
1913	30
1914	17
1915	19
1916	14
1917	8
1918	24
1919	22
1920	10
1921	6
1922	7
1923	26
1924	17
1925	18
1926	17
1927	9
1928	18
1929	13
1930	16
1931	12
1932	6
1933	15
1934	18
1935	13
1936	29
1937	12
1938	22
1939	44
1940	34
1941	16
1942	33
1943	41
1944	16
1945	24
1946	41
1947	25
1948	21
1949	44
1950	48
1951	49
1952	25
1953	27
1954	57
1955	40
1956	39
1957	27
1958	20
1959	32
1960	10
1961	37
1962	35
1963	31
1964	47
1965	40
1966	33
1967	28
1968	40

All-Time Record Progression

4 new records

4 all-time records were set at Brooks 1 between 21 January 1943 and 15 January 1950. Each dot is a new record.

When Brooks 1 set new all-time records
Date	Kind	Detail
1943-01-21	Record low maximum temperature	Record low maximum temperature -34.4 C (-29.9 F)
1943-01-21	Record low minimum temperature	Record low minimum temperature -43.9 C (-47.0 F)
1950-01-03	Record low minimum temperature	Record low minimum temperature -45.0 C (-49.0 F)
1950-01-15	Record low minimum temperature	Record low minimum temperature -45.6 C (-50.1 F)

Wettest Day of Each Month

Jun: 101.1 mm (4.0 in)

The wettest day on record for each calendar month at Brooks 1. The most was 101.1 mm (4.0 in) on 2 June 1953.

Record daily precipitation for each month at Brooks 1
Month	Record daily precipitation (mm)	Date
Jan	17.8 mm (0.7 in)	9 January 1964
Feb	30.5 mm (1.2 in)	22 February 1953
Mar	27.9 mm (1.1 in)	20 March 1953
Apr	27.9 mm (1.1 in)	28 April 1967
May	33.0 mm (1.3 in)	19 May 1912
Jun	101.1 mm (4.0 in)	2 June 1953
Jul	65.0 mm (2.6 in)	28 July 1948
Aug	70.1 mm (2.8 in)	2 August 1956
Sep	38.1 mm (1.5 in)	8 September 1931
Oct	36.8 mm (1.4 in)	2 October 1951
Nov	20.3 mm (0.8 in)	14 November 1958
Dec	22.9 mm (0.9 in)	30 December 1950

Period of Record Coverage

1912 to 1968

57 years of record at Brooks 1, 1912 to 1968. 28 years have data for under 90 percent of days and are left out of rankings: 1912, 1913, 1914, 1915, 1916, 1917, 1918, 1919 and others.

Days with data per year at Brooks 1
Year	Days with data	Share of year	Complete
1912	206	56%	No
1913	184	50%	No
1914	214	59%	No
1915	214	59%	No
1916	213	58%	No
1917	214	59%	No
1918	214	59%	No
1919	213	58%	No
1920	214	58%	No
1921	214	59%	No
1922	213	58%	No
1923	213	58%	No
1924	214	58%	No
1925	213	58%	No
1926	213	58%	No
1927	214	59%	No
1928	214	58%	No
1929	214	59%	No
1930	213	58%	No
1931	183	50%	No
1932	214	58%	No
1933	213	58%	No
1934	214	59%	No
1935	214	59%	No
1936	214	58%	No
1937	275	75%	No
1938	363	99%	Yes
1939	334	92%	Yes
1940	364	99%	Yes
1941	273	75%	No
1942	364	100%	Yes
1943	365	100%	Yes
1944	366	100%	Yes
1945	365	100%	Yes
1946	359	98%	Yes
1947	332	91%	Yes
1948	365	100%	Yes
1949	365	100%	Yes
1950	364	100%	Yes
1951	352	96%	Yes
1952	365	100%	Yes
1953	365	100%	Yes
1954	365	100%	Yes
1955	365	100%	Yes
1956	366	100%	Yes
1957	365	100%	Yes
1958	364	100%	Yes
1959	365	100%	Yes
1960	360	98%	Yes
1961	331	91%	Yes
1962	362	99%	Yes
1963	362	99%	Yes
1964	361	99%	Yes
1965	364	100%	Yes
1966	363	99%	Yes
1967	365	100%	Yes
1968	244	67%	No

Latest Records

Latest records at Brooks 1
Date	Station	Record	Value	Beat old record by	Old record stood	Significance
11 August 1968	Brooks 1, CA	daily rain	9.4 mm (0.37 in)	2.8 mm (0.11 in)	17 years	12 of 100 (Routine)
8 August 1968	Brooks 1, CA	daily low max	16.1 C (61.0 F)	1.1 C (2.0 F)	44 years	20 of 100 (Routine)
6 August 1968	Brooks 1, CA	daily low max	15.0 C (59.0 F)	1.7 C (3.1 F)	2 years	8 of 100 (Routine)
31 July 1968	Brooks 1, CA	daily low min	4.4 C (39.9 F)	1.2 C (2.2 F)	51 years	23 of 100 (Routine)
30 July 1968	Brooks 1, CA	daily low max	17.8 C (64.0 F)	0.5 C (0.9 F)	45 years	19 of 100 (Routine)
23 July 1968	Brooks 1, CA	daily low max	18.3 C (64.9 F)	1.7 C (3.1 F)	52 years	23 of 100 (Routine)
21 July 1968	Brooks 1, CA	daily low min	2.8 C (37.0 F)	3.3 C (5.9 F)	42 years	27 of 100 (Routine)
20 July 1968	Brooks 1, CA	daily low max	15.0 C (59.0 F)	3.3 C (5.9 F)	42 years	24 of 100 (Routine)
12 July 1968	Brooks 1, CA	daily high min (Tie)	16.7 C (62.1 F)	tie	54 years	5 of 100 (Routine)
9 July 1968	Brooks 1, CA	daily high max (Tie)	34.4 C (93.9 F)	tie	45 years	4 of 100 (Routine)
30 June 1968	Brooks 1, CA	daily low max (Tie)	12.8 C (55.0 F)	tie	41 years	4 of 100 (Routine)
29 June 1968	Brooks 1, CA	daily low max	8.9 C (48.0 F)	6.7 C (12.1 F)	50 years	33 of 100 (Routine)
29 May 1968	Brooks 1, CA	daily rain	28.7 mm (1.1 in)	9.4 mm (0.37 in)	22 years	27 of 100 (Routine)
23 May 1968	Brooks 1, CA	daily high min	11.7 C (53.1 F)	0.6 C (1.1 F)	39 years	17 of 100 (Routine)
11 May 1968	Brooks 1, CA	daily low min	-3.9 C (25.0 F)	0.6 C (1.1 F)	54 years	22 of 100 (Routine)
6 May 1968	Brooks 1, CA	daily rain	29.0 mm (1.1 in)	9.9 mm (0.39 in)	35 years	31 of 100 (Routine)
30 April 1968	Brooks 1, CA	daily high max	28.3 C (82.9 F)	1.6 C (2.9 F)	11 years	10 of 100 (Routine)
11 April 1968	Brooks 1, CA	daily rain	5.1 mm (0.20 in)	1.3 mm (0.05 in)	15 years	11 of 100 (Routine)
11 April 1968	Brooks 1, CA	daily snowfall	5.1 cm (2.0 in)	1.3 cm (0.5 in)	15 years	11 of 100 (Routine)
24 March 1968	Brooks 1, CA	daily high min	3.9 C (39.0 F)	1.7 C (3.1 F)	23 years	12 of 100 (Routine)

Climate Trend

24 complete years, 1938 to 1967

One stripe for each of 24 complete years at Brooks 1, 1938 to 1967. Blue stripes are years cooler than the station's own mean of 3.7 C (38.6 F); red stripes are warmer. The coolest year was 1951, at 1.1 C (33.9 F), and the warmest was 1944, at 5.5 C (42.0 F). The strongest colour marks a difference of 2.7 C (4.9 F).

Annual mean temperature at Brooks 1 as warming stripes, 1938 to 1967
Year	Annual mean temperature	Difference from the station mean
1938	4.4 C	+0.74 C
1940	3.9 C	+0.17 C
1942	4.6 C	+0.93 C
1943	4.5 C	+0.84 C
1944	5.5 C	+1.86 C
1945	3.9 C	+0.24 C
1946	5.1 C	+1.46 C
1948	3.6 C	-0.07 C
1949	3.8 C	+0.11 C
1950	1.7 C	-2.02 C
1951	1.1 C	-2.61 C
1952	3.6 C	-0.12 C
1953	4.9 C	+1.25 C
1954	3.3 C	-0.36 C
1956	2.9 C	-0.83 C
1957	3.8 C	+0.16 C
1958	4.4 C	+0.75 C
1959	2.9 C	-0.76 C
1960	3.8 C	+0.08 C
1962	4.4 C	+0.71 C
1964	3.7 C	+0.03 C
1965	2.3 C	-1.41 C
1966	2.7 C	-0.95 C
1967	3.4 C	-0.31 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

1912 to 1968

Yearly extremes at Brooks 1: the record and the median year
Measure	Record	Year of the record	Median year	Years with a value
Hottest day (TXx)	38.9 C (102.0 F)	1921	35.0 C (95.0 F)	57
Coldest night (TNn)	-45.6 C (-50.1 F)	1950	-31.7 C (-25.1 F)	57
Wettest day (Rx1day)	101.1 mm (4.0 in)	1953	26.4 mm (1.0 in)	51
Wettest five days (Rx5day)	127.5 mm (5.0 in)	1953	39.9 mm (1.6 in)	51
Longest dry spell (CDD)	84 days	1913	36 days	51

Hottest day (TXx)

The hottest day of the year at Brooks 1, 1912 to 1968. The record is 38.9 C (102.0 F) in 1921, marked on the chart; the median year is 35.0 C (95.0 F).

Hottest day (TXx) at Brooks 1 by year
Year	Hottest day (TXx)
1912	35.6 C (96.1 F)
1913	32.8 C (91.0 F)
1914	35.0 C (95.0 F)
1915	37.2 C (99.0 F)
1916	32.2 C (90.0 F)
1917	35.6 C (96.1 F)
1918	35.6 C (96.1 F)
1919	37.2 C (99.0 F)
1920	33.3 C (91.9 F)
1921	38.9 C (102.0 F)
1922	34.4 C (93.9 F)
1923	34.4 C (93.9 F)
1924	35.6 C (96.1 F)
1925	34.4 C (93.9 F)
1926	34.4 C (93.9 F)
1927	30.0 C (86.0 F)
1928	33.3 C (91.9 F)
1929	36.1 C (97.0 F)
1930	36.1 C (97.0 F)
1931	36.7 C (98.1 F)
1932	35.6 C (96.1 F)
1933	37.2 C (99.0 F)
1934	35.6 C (96.1 F)
1935	36.1 C (97.0 F)
1936	36.7 C (98.1 F)
1937	36.1 C (97.0 F)
1938	34.4 C (93.9 F)
1939	37.2 C (99.0 F)
1940	35.6 C (96.1 F)
1941	32.2 C (90.0 F)
1942	34.4 C (93.9 F)
1943	36.7 C (98.1 F)
1944	35.6 C (96.1 F)
1945	37.8 C (100.0 F)
1946	37.2 C (99.0 F)
1947	35.6 C (96.1 F)
1948	35.0 C (95.0 F)
1949	36.1 C (97.0 F)
1950	34.4 C (93.9 F)
1951	33.3 C (91.9 F)
1952	32.2 C (90.0 F)
1953	37.8 C (100.0 F)
1954	34.4 C (93.9 F)
1955	34.4 C (93.9 F)
1956	33.9 C (93.0 F)
1957	32.8 C (91.0 F)
1958	33.9 C (93.0 F)
1959	32.8 C (91.0 F)
1960	36.7 C (98.1 F)
1961	37.8 C (100.0 F)
1962	33.3 C (91.9 F)
1963	33.3 C (91.9 F)
1964	34.4 C (93.9 F)
1965	33.9 C (93.0 F)
1966	32.2 C (90.0 F)
1967	35.0 C (95.0 F)
1968	34.4 C (93.9 F)

Coldest night (TNn)

The coldest night of the year at Brooks 1, 1912 to 1968. The record is -45.6 C (-50.1 F) in 1950, marked on the chart; the median year is -31.7 C (-25.1 F).

Coldest night (TNn) at Brooks 1 by year
Year	Coldest night (TNn)
1912	-11.1 C (12.0 F)
1913	-11.7 C (10.9 F)
1914	-7.8 C (18.0 F)
1915	-5.6 C (21.9 F)
1916	-10.0 C (14.0 F)
1917	-13.9 C (7.0 F)
1918	-15.6 C (3.9 F)
1919	-23.3 C (-9.9 F)
1920	-21.7 C (-7.1 F)
1921	-8.3 C (17.1 F)
1922	-7.8 C (18.0 F)
1923	-13.3 C (8.1 F)
1924	-11.1 C (12.0 F)
1925	-20.0 C (-4.0 F)
1926	-13.3 C (8.1 F)
1927	-13.9 C (7.0 F)
1928	-12.2 C (10.0 F)
1929	-17.8 C (0.0 F)
1930	-15.6 C (3.9 F)
1931	-11.1 C (12.0 F)
1932	-12.8 C (9.0 F)
1933	-16.1 C (3.0 F)
1934	-11.1 C (12.0 F)
1935	-17.8 C (0.0 F)
1936	-18.9 C (-2.0 F)
1937	-30.6 C (-23.1 F)
1938	-38.3 C (-36.9 F)
1939	-41.1 C (-42.0 F)
1940	-35.6 C (-32.1 F)
1941	-31.1 C (-24.0 F)
1942	-31.7 C (-25.1 F)
1943	-43.9 C (-47.0 F)
1944	-32.2 C (-26.0 F)
1945	-31.7 C (-25.1 F)
1946	-32.2 C (-26.0 F)
1947	-36.7 C (-34.1 F)
1948	-34.4 C (-29.9 F)
1949	-40.6 C (-41.1 F)
1950	-45.6 C (-50.1 F)
1951	-40.6 C (-41.1 F)
1952	-36.1 C (-33.0 F)
1953	-30.0 C (-22.0 F)
1954	-45.0 C (-49.0 F)
1955	-35.6 C (-32.1 F)
1956	-41.7 C (-43.1 F)
1957	-41.7 C (-43.1 F)
1958	-36.1 C (-33.0 F)
1959	-33.9 C (-29.0 F)
1960	-34.4 C (-29.9 F)
1961	-33.9 C (-29.0 F)
1962	-35.6 C (-32.1 F)
1963	-35.0 C (-31.0 F)
1964	-39.4 C (-38.9 F)
1965	-35.6 C (-32.1 F)
1966	-40.0 C (-40.0 F)
1967	-33.3 C (-27.9 F)
1968	-35.0 C (-31.0 F)

Wettest day (Rx1day)

The wettest day of the year at Brooks 1, 1912 to 1968. The record is 101.1 mm (4.0 in) in 1953, marked on the chart; the median year is 26.4 mm (1.0 in).

Wettest day (Rx1day) at Brooks 1 by year
Year	Wettest day (Rx1day)
1912	33.0 mm (1.3 in)
1913	5.1 mm (0.20 in)
1914	12.7 mm (0.5 in)
1915	16.5 mm (0.6 in)
1916	6.4 mm (0.25 in)
1917	20.3 mm (0.8 in)
1918	21.6 mm (0.9 in)
1919	12.7 mm (0.5 in)
1920	12.7 mm (0.5 in)
1921	7.6 mm (0.30 in)
1922	n/a
1923	n/a
1924	n/a
1925	0.0 mm (0.00 in)
1926	6.9 mm (0.27 in)
1927	3.3 mm (0.13 in)
1928	n/a
1929	n/a
1930	n/a
1931	38.1 mm (1.5 in)
1932	38.1 mm (1.5 in)
1933	25.1 mm (1.0 in)
1934	18.5 mm (0.7 in)
1935	16.5 mm (0.6 in)
1936	31.0 mm (1.2 in)
1937	29.7 mm (1.2 in)
1938	26.4 mm (1.0 in)
1939	30.0 mm (1.2 in)
1940	36.1 mm (1.4 in)
1941	27.4 mm (1.1 in)
1942	25.9 mm (1.0 in)
1943	16.5 mm (0.6 in)
1944	54.9 mm (2.2 in)
1945	34.3 mm (1.4 in)
1946	36.1 mm (1.4 in)
1947	59.9 mm (2.4 in)
1948	65.0 mm (2.6 in)
1949	21.3 mm (0.8 in)
1950	33.8 mm (1.3 in)
1951	81.3 mm (3.2 in)
1952	51.6 mm (2.0 in)
1953	101.1 mm (4.0 in)
1954	31.2 mm (1.2 in)
1955	19.3 mm (0.8 in)
1956	70.1 mm (2.8 in)
1957	15.7 mm (0.6 in)
1958	23.4 mm (0.9 in)
1959	16.5 mm (0.6 in)
1960	27.4 mm (1.1 in)
1961	20.8 mm (0.8 in)
1962	21.1 mm (0.8 in)
1963	52.1 mm (2.1 in)
1964	25.4 mm (1.0 in)
1965	44.5 mm (1.8 in)
1966	51.3 mm (2.0 in)
1967	27.9 mm (1.1 in)
1968	29.0 mm (1.1 in)

Wettest five days (Rx5day)

The wettest five days of the year at Brooks 1, 1912 to 1968. The record is 127.5 mm (5.0 in) in 1953, marked on the chart; the median year is 39.9 mm (1.6 in).

Wettest five days (Rx5day) at Brooks 1 by year
Year	Wettest five days (Rx5day)
1912	47.0 mm (1.9 in)
1913	5.1 mm (0.20 in)
1914	15.2 mm (0.6 in)
1915	17.8 mm (0.7 in)
1916	16.6 mm (0.7 in)
1917	26.1 mm (1.0 in)
1918	33.0 mm (1.3 in)
1919	33.0 mm (1.3 in)
1920	19.1 mm (0.8 in)
1921	12.7 mm (0.5 in)
1922	n/a
1923	n/a
1924	n/a
1925	0.0 mm (0.00 in)
1926	14.5 mm (0.6 in)
1927	7.6 mm (0.30 in)
1928	n/a
1929	n/a
1930	n/a
1931	78.8 mm (3.1 in)
1932	48.3 mm (1.9 in)
1933	37.6 mm (1.5 in)
1934	26.7 mm (1.1 in)
1935	43.9 mm (1.7 in)
1936	49.8 mm (2.0 in)
1937	47.4 mm (1.9 in)
1938	39.9 mm (1.6 in)
1939	57.4 mm (2.3 in)
1940	50.0 mm (2.0 in)
1941	37.1 mm (1.5 in)
1942	49.3 mm (1.9 in)
1943	23.1 mm (0.9 in)
1944	56.4 mm (2.2 in)
1945	53.4 mm (2.1 in)
1946	51.8 mm (2.0 in)
1947	62.2 mm (2.4 in)
1948	81.3 mm (3.2 in)
1949	33.0 mm (1.3 in)
1950	68.6 mm (2.7 in)
1951	100.3 mm (3.9 in)
1952	60.7 mm (2.4 in)
1953	127.5 mm (5.0 in)
1954	54.1 mm (2.1 in)
1955	39.9 mm (1.6 in)
1956	83.8 mm (3.3 in)
1957	24.4 mm (1.0 in)
1958	37.4 mm (1.5 in)
1959	33.5 mm (1.3 in)
1960	37.8 mm (1.5 in)
1961	20.9 mm (0.8 in)
1962	37.9 mm (1.5 in)
1963	70.4 mm (2.8 in)
1964	45.2 mm (1.8 in)
1965	83.9 mm (3.3 in)
1966	52.3 mm (2.1 in)
1967	35.5 mm (1.4 in)
1968	35.4 mm (1.4 in)

Longest dry spell (CDD)

The longest dry spell of the year at Brooks 1, 1912 to 1968. The record is 84 days in 1913, marked on the chart; the median year is 36 days.

Longest dry spell (CDD) at Brooks 1 by year
Year	Longest dry spell (CDD)
1912	17 days
1913	84 days
1914	24 days
1915	31 days
1916	18 days
1917	47 days
1918	53 days
1919	27 days
1920	28 days
1921	21 days
1922	n/a
1923	n/a
1924	n/a
1925	30 days
1926	17 days
1927	10 days
1928	n/a
1929	n/a
1930	n/a
1931	37 days
1932	33 days
1933	47 days
1934	33 days
1935	46 days
1936	53 days
1937	36 days
1938	36 days
1939	56 days
1940	33 days
1941	24 days
1942	27 days
1943	56 days
1944	45 days
1945	28 days
1946	38 days
1947	25 days
1948	39 days
1949	31 days
1950	34 days
1951	22 days
1952	64 days
1953	43 days
1954	52 days
1955	27 days
1956	25 days
1957	47 days
1958	46 days
1959	83 days
1960	43 days
1961	44 days
1962	47 days
1963	76 days
1964	42 days
1965	27 days
1966	43 days
1967	58 days
1968	36 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

24 years with a frost

Across 24 years with a frost, the median last spring frost at Brooks 1 falls on 20 May and the median first autumn frost on 18 September, which leaves a median of 119 days between them.

Frost dates and growing season at Brooks 1
Measure	Median, all years	Earliest period	Recent period (1938 to 1967)	Recent against earliest	Fitted trend
Last spring frost	20 May	n/a	20 May	n/a	n/a
First autumn frost	18 September	n/a	18 September	n/a	n/a
Growing days	119 days	n/a	119 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.

Rainfall Return Levels

32 years, 1931 to 1967

A day with at least 30.6 mm (1.2 in) of rain is expected about once in 2 years. A day with at least 127.1 mm (5.0 in) of rain is expected about once in 100 years.

Rainfall return levels at Brooks 1: the daily rain expected about once in a given number of years
Expected about once in	A day with at least	Note
2 years	30.6 mm (1.2 in)
5 years	47.5 mm (1.9 in)
10 years	61.6 mm (2.4 in)
25 years	83.6 mm (3.3 in)
50 years	103.6 mm (4.1 in)	Longer than the 32 years of record
100 years	127.1 mm (5.0 in)	Longer than the 32 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, 32 years of values from 1931 to 1967.

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: 101.1 mm (4.0 in) in 1953; 81.3 mm (3.2 in) in 1951; 70.1 mm (2.8 in) in 1956.

Download the Data

Data for Brooks 1 standing records by year: CSV or JSON. Field meanings are on the data page.
Data for Brooks 1 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).