Chamberlain Weather Records (USC00391609)

Record envelope, standing records and threshold days for Chamberlain (USC00391609), South Dakota, United States, with 83 years of record.

Key Facts for Chamberlain

Chamberlain (USC00391609) is a weather station in South Dakota, United States at 43.80 latitude and -99.33 longitude, 427 m (1,401 ft) above sea level.
The station reports from 1896 to 1978, 83 years of record.
1,464 records set at Chamberlain still stand.
Records are tracked for tmax, tmin, prcp, snow, snwd: an element needs 30 years of data to be eligible.
Chamberlain set a daily record high minimum temperature of -2.8 C (27.0 F) on 18 December 1978.

About the Station

Location: South Dakota, United States, 43.80 latitude, -99.33 longitude.
Elevation: 427 m (1,401 ft).
Period of record: 1896 to 1978, 83 years.
Eligible elements: tmax, tmin, prcp, snow, snwd.

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 Chamberlain. 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 Chamberlain, with 2026 drawn through them
Month	Highest record high	Lowest record low	2026 highest maximum	2026 lowest minimum
Jan	20.0 C (68.0 F)	-40.0 C (-40.0 F)	n/a	n/a
Feb	21.7 C (71.1 F)	-41.1 C (-42.0 F)	n/a	n/a
Mar	31.7 C (89.1 F)	-26.7 C (-16.1 F)	n/a	n/a
Apr	35.0 C (95.0 F)	-14.4 C (6.1 F)	n/a	n/a
May	38.3 C (100.9 F)	-6.1 C (21.0 F)	n/a	n/a
Jun	40.6 C (105.1 F)	1.1 C (34.0 F)	n/a	n/a
Jul	44.4 C (111.9 F)	6.1 C (43.0 F)	n/a	n/a
Aug	43.3 C (109.9 F)	4.4 C (39.9 F)	n/a	n/a
Sep	42.8 C (109.0 F)	-6.1 C (21.0 F)	n/a	n/a
Oct	37.8 C (100.0 F)	-16.1 C (3.0 F)	n/a	n/a
Nov	26.7 C (80.1 F)	-26.7 C (-16.1 F)	n/a	n/a
Dec	20.0 C (68.0 F)	-37.2 C (-35.0 F)	n/a	n/a

Which Years Hold Standing Records

1,464 standing records

1,464 records at Chamberlain still stand. 1905 holds the most, with 63.

Standing records at Chamberlain by the year they were set
Year set	Standing records
1896	37
1897	59
1898	47
1899	54
1900	43
1901	56
1902	45
1903	47
1904	39
1905	63
1906	35
1907	46
1908	47
1909	45
1910	54
1911	13
1912	29
1913	14
1914	23
1915	43
1916	29
1917	56
1918	14
1963	17
1964	42
1965	43
1966	42
1967	36
1968	40
1969	37
1970	29
1971	24
1972	35
1973	23
1974	40
1975	28
1976	41
1977	26
1978	23

All-Time Record Progression

3 new records

3 all-time records were set at Chamberlain between 9 February 1978 and 13 February 1978. Each dot is a new record.

When Chamberlain set new all-time records
Date	Kind	Detail
1978-02-09	Record snow depth	Record snow depth 58.4 cm (23.0 in)
1978-02-12	Record snow depth	Record snow depth 66.0 cm (26.0 in)
1978-02-13	Record snow depth	Record snow depth 73.7 cm (29.0 in)

Wettest Day of Each Month

Jun: 113.5 mm (4.5 in)

The wettest day on record for each calendar month at Chamberlain. The most was 113.5 mm (4.5 in) on 19 June 1931.

Record daily precipitation for each month at Chamberlain
Month	Record daily precipitation (mm)	Date
Jan	29.5 mm (1.2 in)	1 January 1916
Feb	40.6 mm (1.6 in)	14 February 1915
Mar	49.8 mm (2.0 in)	17 March 1946
Apr	74.2 mm (2.9 in)	22 April 1971
May	68.8 mm (2.7 in)	15 May 1962
Jun	113.5 mm (4.5 in)	19 June 1931
Jul	95.3 mm (3.8 in)	20 July 1907
Aug	77.2 mm (3.0 in)	5 August 1960
Sep	64.8 mm (2.6 in)	1 September 1959
Oct	56.9 mm (2.2 in)	7 October 1967
Nov	63.5 mm (2.5 in)	2 November 1972
Dec	22.6 mm (0.9 in)	7 December 1951

Period of Record Coverage

1896 to 1978

39 years of record at Chamberlain, 1896 to 1978. 12 years have data for under 90 percent of days and are left out of rankings: 1896, 1899, 1909, 1910, 1911, 1912, 1913, 1914 and others.

Days with data per year at Chamberlain
Year	Days with data	Share of year	Complete
1896	147	40%	No
1897	354	97%	Yes
1898	355	97%	Yes
1899	289	79%	No
1900	363	99%	Yes
1901	334	92%	Yes
1902	357	98%	Yes
1903	362	99%	Yes
1904	364	99%	Yes
1905	364	100%	Yes
1906	365	100%	Yes
1907	361	99%	Yes
1908	363	99%	Yes
1909	292	80%	No
1910	308	84%	No
1911	80	22%	No
1912	196	54%	No
1913	107	29%	No
1914	221	61%	No
1915	335	92%	Yes
1916	174	48%	No
1917	258	71%	No
1918	113	31%	No
1963	137	38%	No
1964	333	91%	Yes
1965	365	100%	Yes
1966	365	100%	Yes
1967	365	100%	Yes
1968	364	99%	Yes
1969	363	99%	Yes
1970	363	99%	Yes
1971	362	99%	Yes
1972	366	100%	Yes
1973	331	91%	Yes
1974	362	99%	Yes
1975	360	99%	Yes
1976	366	100%	Yes
1977	358	98%	Yes
1978	333	91%	Yes

Latest Records

Latest records at Chamberlain
Date	Station	Record	Value	Beat old record by	Old record stood	Significance
18 December 1978	Chamberlain, US	daily high min	-2.8 C (27.0 F)	1.6 C (2.9 F)	12 years	13 of 100 (Routine)
30 November 1978	Chamberlain, US	daily snow depth (Tie)	5.1 cm (2.0 in)	tie	23 years	3 of 100 (Routine)
27 November 1978	Chamberlain, US	daily snow depth (Tie)	5.1 cm (2.0 in)	tie	23 years	3 of 100 (Routine)
30 October 1978	Chamberlain, US	daily high max	27.8 C (82.0 F)	1.1 C (2.0 F)	63 years	27 of 100 (Routine)
29 October 1978	Chamberlain, US	daily high max	27.8 C (82.0 F)	1.7 C (3.1 F)	78 years	33 of 100 (Routine)
25 October 1978	Chamberlain, US	daily high max	26.1 C (79.0 F)	2.2 C (4.0 F)	72 years	32 of 100 (Routine)
26 September 1978	Chamberlain, US	daily high min	18.3 C (64.9 F)	2.7 C (4.9 F)	68 years	33 of 100 (Routine)
18 September 1978	Chamberlain, US	daily rain	30.5 mm (1.2 in)	8.9 mm (0.35 in)	19 years	21 of 100 (Routine)
16 September 1978	Chamberlain, US	daily high min (Tie)	17.8 C (64.0 F)	tie	69 years	7 of 100 (Routine)
10 September 1978	Chamberlain, US	daily high min (Tie)	21.7 C (71.1 F)	tie	5 years	2 of 100 (Routine)
9 September 1978	Chamberlain, US	daily high min (Tie)	20.0 C (68.0 F)	tie	13 years	3 of 100 (Routine)
8 September 1978	Chamberlain, US	daily high min	23.3 C (73.9 F)	0.5 C (0.9 F)	0 years	8 of 100 (Routine)
7 September 1978	Chamberlain, US	daily high min	23.9 C (75.0 F)	1.1 C (2.0 F)	80 years	34 of 100 (Routine)
6 September 1978	Chamberlain, US	daily high max (Tie)	40.0 C (104.0 F)	tie	1 year	2 of 100 (Routine)
5 September 1978	Chamberlain, US	daily high max	39.4 C (102.9 F)	1.1 C (2.0 F)	64 years	28 of 100 (Routine)
4 September 1978	Chamberlain, US	daily high min	22.2 C (72.0 F)	1.6 C (2.9 F)	80 years	35 of 100 (Notable)
4 September 1978	Chamberlain, US	daily high max	37.8 C (100.0 F)	1.1 C (2.0 F)	64 years	28 of 100 (Routine)
27 August 1978	Chamberlain, US	daily rain	14.5 mm (0.6 in)	0.5 mm (0.02 in)	28 years	16 of 100 (Routine)
23 August 1978	Chamberlain, US	daily high min (Tie)	22.2 C (72.0 F)	tie	9 years	2 of 100 (Routine)
13 August 1978	Chamberlain, US	daily high min	23.9 C (75.0 F)	2.8 C (5.0 F)	68 years	35 of 100 (Notable)

Climate Trend

23 complete years, 1897 to 1977

One stripe for each of 23 complete years at Chamberlain, 1897 to 1977. Blue stripes are years cooler than the station's own mean of 9.2 C (48.6 F); red stripes are warmer. The coolest year was 1897, at 7.9 C (46.1 F), and the warmest was 1976, at 11.0 C (51.8 F). The strongest colour marks a difference of 1.8 C (3.2 F).

Annual mean temperature at Chamberlain as warming stripes, 1897 to 1977
Year	Annual mean temperature	Difference from the station mean
1897	7.9 C	-1.35 C
1898	9.2 C	-0.05 C
1900	10.1 C	+0.88 C
1901	9.9 C	+0.67 C
1902	8.2 C	-0.99 C
1903	8.4 C	-0.85 C
1904	8.5 C	-0.72 C
1905	8.4 C	-0.78 C
1906	8.7 C	-0.48 C
1907	8.3 C	-0.93 C
1908	9.6 C	+0.43 C
1965	9.0 C	-0.24 C
1966	8.9 C	-0.29 C
1967	9.4 C	+0.14 C
1968	9.1 C	-0.08 C
1969	9.0 C	-0.19 C
1970	9.3 C	+0.07 C
1971	9.4 C	+0.20 C
1972	8.5 C	-0.67 C
1974	10.8 C	+1.63 C
1975	9.9 C	+0.69 C
1976	11.0 C	+1.77 C
1977	10.4 C	+1.22 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

1896 to 1978

Yearly extremes at Chamberlain: the record and the median year
Measure	Record	Year of the record	Median year	Years with a value
Hottest day (TXx)	44.4 C (111.9 F)	1964	40.0 C (104.0 F)	39
Coldest night (TNn)	-41.1 C (-42.0 F)	1905	-28.9 C (-20.0 F)	39
Wettest day (Rx1day)	113.5 mm (4.5 in)	1931	44.2 mm (1.7 in)	72
Wettest five days (Rx5day)	116.3 mm (4.6 in)	1901	66.5 mm (2.6 in)	72
Longest dry spell (CDD)	88 days	1907	31 days	72

Hottest day (TXx)

The hottest day of the year at Chamberlain, 1896 to 1978. The record is 44.4 C (111.9 F) in 1964, marked on the chart; the median year is 40.0 C (104.0 F).

Hottest day (TXx) at Chamberlain by year
Year	Hottest day (TXx)
1896	40.6 C (105.1 F)
1897	40.6 C (105.1 F)
1898	39.4 C (102.9 F)
1899	38.9 C (102.0 F)
1900	40.6 C (105.1 F)
1901	42.8 C (109.0 F)
1902	41.7 C (107.1 F)
1903	40.6 C (105.1 F)
1904	42.8 C (109.0 F)
1905	40.0 C (104.0 F)
1906	38.9 C (102.0 F)
1907	41.1 C (106.0 F)
1908	40.6 C (105.1 F)
1909	40.0 C (104.0 F)
1910	37.2 C (99.0 F)
1911	23.3 C (73.9 F)
1912	39.4 C (102.9 F)
1913	38.3 C (100.9 F)
1914	39.4 C (102.9 F)
1915	33.3 C (91.9 F)
1916	35.0 C (95.0 F)
1917	41.1 C (106.0 F)
1918	26.7 C (80.1 F)
1919	n/a
1920	n/a
1921	n/a
1922	n/a
1923	n/a
1924	n/a
1925	n/a
1926	n/a
1927	n/a
1928	n/a
1929	n/a
1930	n/a
1931	n/a
1932	n/a
1933	n/a
1945	n/a
1946	n/a
1947	n/a
1948	n/a
1949	n/a
1950	n/a
1951	n/a
1952	n/a
1953	n/a
1954	n/a
1955	n/a
1956	n/a
1957	n/a
1958	n/a
1959	n/a
1960	n/a
1961	n/a
1962	n/a
1963	37.8 C (100.0 F)
1964	44.4 C (111.9 F)
1965	43.3 C (109.9 F)
1966	43.3 C (109.9 F)
1967	38.3 C (100.9 F)
1968	40.6 C (105.1 F)
1969	40.0 C (104.0 F)
1970	39.4 C (102.9 F)
1971	40.0 C (104.0 F)
1972	37.8 C (100.0 F)
1973	40.0 C (104.0 F)
1974	40.6 C (105.1 F)
1975	40.6 C (105.1 F)
1976	41.7 C (107.1 F)
1977	39.4 C (102.9 F)
1978	40.0 C (104.0 F)

Coldest night (TNn)

The coldest night of the year at Chamberlain, 1896 to 1978. The record is -41.1 C (-42.0 F) in 1905, marked on the chart; the median year is -28.9 C (-20.0 F).

Coldest night (TNn) at Chamberlain by year
Year	Coldest night (TNn)
1896	-26.7 C (-16.1 F)
1897	-28.9 C (-20.0 F)
1898	-25.6 C (-14.1 F)
1899	-37.8 C (-36.0 F)
1900	-26.1 C (-15.0 F)
1901	-28.9 C (-20.0 F)
1902	-31.1 C (-24.0 F)
1903	-30.0 C (-22.0 F)
1904	-29.4 C (-20.9 F)
1905	-41.1 C (-42.0 F)
1906	-30.6 C (-23.1 F)
1907	-28.9 C (-20.0 F)
1908	-26.1 C (-15.0 F)
1909	-30.6 C (-23.1 F)
1910	-28.9 C (-20.0 F)
1911	-25.0 C (-13.0 F)
1912	-40.0 C (-40.0 F)
1913	-20.0 C (-4.0 F)
1914	-33.9 C (-29.0 F)
1915	-28.3 C (-18.9 F)
1916	-37.2 C (-35.0 F)
1917	-37.2 C (-35.0 F)
1918	-33.9 C (-29.0 F)
1919	n/a
1920	n/a
1921	n/a
1922	n/a
1923	n/a
1924	n/a
1925	n/a
1926	n/a
1927	n/a
1928	n/a
1929	n/a
1930	n/a
1931	n/a
1932	n/a
1933	n/a
1945	n/a
1946	n/a
1947	n/a
1948	n/a
1949	n/a
1950	n/a
1951	n/a
1952	n/a
1953	n/a
1954	n/a
1955	n/a
1956	n/a
1957	n/a
1958	n/a
1959	n/a
1960	n/a
1961	n/a
1962	n/a
1963	-26.7 C (-16.1 F)
1964	-28.3 C (-18.9 F)
1965	-25.6 C (-14.1 F)
1966	-33.9 C (-29.0 F)
1967	-27.8 C (-18.0 F)
1968	-28.9 C (-20.0 F)
1969	-27.2 C (-17.0 F)
1970	-34.4 C (-29.9 F)
1971	-26.7 C (-16.1 F)
1972	-30.6 C (-23.1 F)
1973	-26.7 C (-16.1 F)
1974	-26.7 C (-16.1 F)
1975	-26.1 C (-15.0 F)
1976	-27.2 C (-17.0 F)
1977	-27.8 C (-18.0 F)
1978	-28.9 C (-20.0 F)

Wettest day (Rx1day)

The wettest day of the year at Chamberlain, 1896 to 1978. The record is 113.5 mm (4.5 in) in 1931, marked on the chart; the median year is 44.2 mm (1.7 in).

Wettest day (Rx1day) at Chamberlain by year
Year	Wettest day (Rx1day)
1896	41.9 mm (1.6 in)
1897	44.5 mm (1.8 in)
1898	59.2 mm (2.3 in)
1899	43.4 mm (1.7 in)
1900	51.8 mm (2.0 in)
1901	80.0 mm (3.1 in)
1902	29.5 mm (1.2 in)
1903	27.2 mm (1.1 in)
1904	33.8 mm (1.3 in)
1905	25.4 mm (1.0 in)
1906	50.8 mm (2.0 in)
1907	95.3 mm (3.8 in)
1908	45.5 mm (1.8 in)
1909	40.1 mm (1.6 in)
1910	63.5 mm (2.5 in)
1911	35.6 mm (1.4 in)
1912	30.5 mm (1.2 in)
1913	53.3 mm (2.1 in)
1914	41.1 mm (1.6 in)
1915	50.0 mm (2.0 in)
1916	29.5 mm (1.2 in)
1917	48.3 mm (1.9 in)
1918	63.5 mm (2.5 in)
1919	69.9 mm (2.8 in)
1920	44.5 mm (1.8 in)
1921	53.3 mm (2.1 in)
1922	63.5 mm (2.5 in)
1923	25.4 mm (1.0 in)
1924	11.4 mm (0.4 in)
1925	33.8 mm (1.3 in)
1926	19.1 mm (0.8 in)
1927	26.7 mm (1.1 in)
1928	29.7 mm (1.2 in)
1929	32.5 mm (1.3 in)
1930	24.6 mm (1.0 in)
1931	113.5 mm (4.5 in)
1932	43.9 mm (1.7 in)
1933	12.4 mm (0.5 in)
1945	0.5 mm (0.02 in)
1946	49.8 mm (2.0 in)
1947	43.2 mm (1.7 in)
1948	44.7 mm (1.8 in)
1949	50.3 mm (2.0 in)
1950	55.9 mm (2.2 in)
1951	58.9 mm (2.3 in)
1952	39.4 mm (1.6 in)
1953	33.0 mm (1.3 in)
1954	38.4 mm (1.5 in)
1955	38.6 mm (1.5 in)
1956	73.9 mm (2.9 in)
1957	35.3 mm (1.4 in)
1958	25.9 mm (1.0 in)
1959	64.8 mm (2.6 in)
1960	77.2 mm (3.0 in)
1961	36.8 mm (1.4 in)
1962	68.8 mm (2.7 in)
1963	40.6 mm (1.6 in)
1964	38.4 mm (1.5 in)
1965	61.0 mm (2.4 in)
1966	63.0 mm (2.5 in)
1967	56.9 mm (2.2 in)
1968	64.8 mm (2.6 in)
1969	39.9 mm (1.6 in)
1970	66.5 mm (2.6 in)
1971	74.2 mm (2.9 in)
1972	63.5 mm (2.5 in)
1973	45.5 mm (1.8 in)
1974	36.3 mm (1.4 in)
1975	34.5 mm (1.4 in)
1976	37.3 mm (1.5 in)
1977	63.0 mm (2.5 in)
1978	51.3 mm (2.0 in)

Wettest five days (Rx5day)

The wettest five days of the year at Chamberlain, 1896 to 1978. The record is 116.3 mm (4.6 in) in 1901, marked on the chart; the median year is 66.5 mm (2.6 in).

Wettest five days (Rx5day) at Chamberlain by year
Year	Wettest five days (Rx5day)
1896	41.9 mm (1.6 in)
1897	98.0 mm (3.9 in)
1898	80.1 mm (3.2 in)
1899	51.6 mm (2.0 in)
1900	77.5 mm (3.1 in)
1901	116.3 mm (4.6 in)
1902	40.7 mm (1.6 in)
1903	32.3 mm (1.3 in)
1904	34.8 mm (1.4 in)
1905	52.3 mm (2.1 in)
1906	73.2 mm (2.9 in)
1907	113.4 mm (4.5 in)
1908	53.9 mm (2.1 in)
1909	73.9 mm (2.9 in)
1910	96.8 mm (3.8 in)
1911	35.6 mm (1.4 in)
1912	42.7 mm (1.7 in)
1913	53.3 mm (2.1 in)
1914	95.3 mm (3.8 in)
1915	80.9 mm (3.2 in)
1916	50.6 mm (2.0 in)
1917	53.4 mm (2.1 in)
1918	101.6 mm (4.0 in)
1919	78.7 mm (3.1 in)
1920	86.3 mm (3.4 in)
1921	53.3 mm (2.1 in)
1922	63.5 mm (2.5 in)
1923	47.0 mm (1.9 in)
1924	23.0 mm (0.9 in)
1925	68.5 mm (2.7 in)
1926	41.9 mm (1.6 in)
1927	65.4 mm (2.6 in)
1928	40.1 mm (1.6 in)
1929	46.5 mm (1.8 in)
1930	54.9 mm (2.2 in)
1931	113.5 mm (4.5 in)
1932	74.9 mm (2.9 in)
1933	22.9 mm (0.9 in)
1945	0.5 mm (0.02 in)
1946	63.3 mm (2.5 in)
1947	69.1 mm (2.7 in)
1948	88.2 mm (3.5 in)
1949	61.2 mm (2.4 in)
1950	96.8 mm (3.8 in)
1951	71.1 mm (2.8 in)
1952	47.8 mm (1.9 in)
1953	67.5 mm (2.7 in)
1954	81.4 mm (3.2 in)
1955	57.7 mm (2.3 in)
1956	113.7 mm (4.5 in)
1957	49.8 mm (2.0 in)
1958	61.9 mm (2.4 in)
1959	67.8 mm (2.7 in)
1960	87.9 mm (3.5 in)
1961	72.0 mm (2.8 in)
1962	112.6 mm (4.4 in)
1963	88.4 mm (3.5 in)
1964	51.4 mm (2.0 in)
1965	85.4 mm (3.4 in)
1966	64.3 mm (2.5 in)
1967	96.8 mm (3.8 in)
1968	83.6 mm (3.3 in)
1969	47.3 mm (1.9 in)
1970	110.7 mm (4.4 in)
1971	100.6 mm (4.0 in)
1972	81.8 mm (3.2 in)
1973	72.6 mm (2.9 in)
1974	42.4 mm (1.7 in)
1975	50.9 mm (2.0 in)
1976	54.9 mm (2.2 in)
1977	78.5 mm (3.1 in)
1978	58.7 mm (2.3 in)

Longest dry spell (CDD)

The longest dry spell of the year at Chamberlain, 1896 to 1978. The record is 88 days in 1907, marked on the chart; the median year is 31 days.

Longest dry spell (CDD) at Chamberlain by year
Year	Longest dry spell (CDD)
1896	34 days
1897	25 days
1898	48 days
1899	42 days
1900	69 days
1901	36 days
1902	25 days
1903	36 days
1904	28 days
1905	33 days
1906	36 days
1907	88 days
1908	30 days
1909	50 days
1910	70 days
1911	29 days
1912	31 days
1913	44 days
1914	23 days
1915	38 days
1916	38 days
1917	77 days
1918	22 days
1919	23 days
1920	17 days
1921	41 days
1922	28 days
1923	10 days
1924	28 days
1925	39 days
1926	66 days
1927	19 days
1928	25 days
1929	21 days
1930	20 days
1931	19 days
1932	19 days
1933	17 days
1945	31 days
1946	37 days
1947	46 days
1948	33 days
1949	77 days
1950	30 days
1951	33 days
1952	78 days
1953	30 days
1954	35 days
1955	36 days
1956	26 days
1957	28 days
1958	51 days
1959	22 days
1960	30 days
1961	43 days
1962	64 days
1963	26 days
1964	72 days
1965	23 days
1966	28 days
1967	40 days
1968	28 days
1969	29 days
1970	23 days
1971	32 days
1972	25 days
1973	19 days
1974	39 days
1975	26 days
1976	38 days
1977	26 days
1978	43 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

23 years with a frost

Across 23 years with a frost, the median last spring frost at Chamberlain falls on 2 May and the median first autumn frost on 5 October, which leaves a median of 154 days between them.

Frost dates and growing season at Chamberlain
Measure	Median, all years	Earliest period	Recent period (1897 to 1977)	Recent against earliest	Fitted trend
Last spring frost	2 May	n/a	2 May	n/a	n/a
First autumn frost	5 October	n/a	5 October	n/a	n/a
Growing days	154 days	n/a	154 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

46 years, 1897 to 1978

A day with at least 48.4 mm (1.9 in) of rain is expected about once in 2 years. A day with at least 97.7 mm (3.8 in) of rain is expected about once in 100 years.

Rainfall return levels at Chamberlain: the daily rain expected about once in a given number of years
Expected about once in	A day with at least	Note
2 years	48.4 mm (1.9 in)
5 years	63.2 mm (2.5 in)
10 years	72.3 mm (2.8 in)
25 years	83.1 mm (3.3 in)
50 years	90.6 mm (3.6 in)	Longer than the 46 years of record
100 years	97.7 mm (3.8 in)	Longer than the 46 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, 46 years of values from 1897 to 1978.

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: 95.3 mm (3.8 in) in 1907; 80.0 mm (3.1 in) in 1901; 77.2 mm (3.0 in) in 1960.

Download the Data

Data for Chamberlain standing records by year: CSV or JSON. Field meanings are on the data page.
Data for Chamberlain 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 2025-12-31. Last revised 31 December 2025 (2025-12-31).