Collinsville 1 S Weather Records (USC00061536)

Record envelope, standing records and threshold days for Collinsville 1 S (USC00061536), Connecticut, United States, with 82 years of record.

Key Facts for Collinsville 1 S

Collinsville 1 S (USC00061536) is a weather station in Connecticut, United States at 41.80 latitude and -72.93 longitude, 85 m (279 ft) above sea level.
The station reports from 1885 to 1966, 82 years of record.
1,462 records set at Collinsville 1 S still stand.
Records are tracked for prcp, snow, snwd: an element needs 30 years of data to be eligible.
Collinsville 1 S set a daily record precipitation of 44.2 mm (1.7 in) on 10 June 1966.

About the Station

Location: Connecticut, United States, 41.80 latitude, -72.93 longitude.
Elevation: 85 m (279 ft).
Period of record: 1885 to 1966, 82 years.
Eligible elements: 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 Collinsville 1 S. 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 Collinsville 1 S, 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)	-31.7 C (-25.1 F)	n/a	n/a
Feb	17.8 C (64.0 F)	-24.4 C (-11.9 F)	n/a	n/a
Mar	15.6 C (60.1 F)	-20.6 C (-5.1 F)	n/a	n/a
Apr	29.4 C (84.9 F)	-8.3 C (17.1 F)	n/a	n/a
May	30.0 C (86.0 F)	-6.1 C (21.0 F)	n/a	n/a
Jun	30.0 C (86.0 F)	2.2 C (36.0 F)	n/a	n/a
Jul	34.4 C (93.9 F)	5.0 C (41.0 F)	n/a	n/a
Aug	30.6 C (87.1 F)	4.4 C (39.9 F)	n/a	n/a
Sep	28.9 C (84.0 F)	0.6 C (33.1 F)	n/a	n/a
Oct	25.0 C (77.0 F)	-8.3 C (17.1 F)	n/a	n/a
Nov	21.1 C (70.0 F)	-13.9 C (7.0 F)	n/a	n/a
Dec	15.0 C (59.0 F)	-19.4 C (-2.9 F)	n/a	n/a

Which Years Hold Standing Records

1,462 standing records

1,462 records at Collinsville 1 S still stand. 1885 holds the most, with 671.

Wettest Day of Each Month

Sep: 119.9 mm (4.7 in)

The wettest day on record for each calendar month at Collinsville 1 S. The most was 119.9 mm (4.7 in) on 9 September 1934.

Record daily precipitation for each month at Collinsville 1 S
Month	Record daily precipitation (mm)	Date
Jan	90.9 mm (3.6 in)	15 January 1940
Feb	83.3 mm (3.3 in)	12 February 1886
Mar	73.9 mm (2.9 in)	12 March 1936
Apr	86.9 mm (3.4 in)	26 April 1945
May	56.9 mm (2.2 in)	28 May 1946
Jun	76.2 mm (3.0 in)	5 June 1960
Jul	77.7 mm (3.1 in)	22 July 1938
Aug	117.9 mm (4.6 in)	4 August 1885
Sep	119.9 mm (4.7 in)	9 September 1934
Oct	80.8 mm (3.2 in)	27 October 1943
Nov	86.9 mm (3.4 in)	23 November 1952
Dec	104.9 mm (4.1 in)	31 December 1948

Period of Record Coverage

1885 to 1960

4 years of record at Collinsville 1 S, 1885 to 1960. 4 years have data for under 90 percent of days and are left out of rankings: 1885, 1886, 1887, 1960.

Latest Records

Latest records at Collinsville 1 S
Date	Station	Record	Value	Beat old record by	Old record stood	Significance
10 June 1966	Collinsville 1 S, US	daily rain	44.2 mm (1.7 in)	9.1 mm (0.36 in)	35 years	25 of 100 (Routine)
20 May 1966	Collinsville 1 S, US	daily rain	29.0 mm (1.1 in)	6.6 mm (0.26 in)	20 years	21 of 100 (Routine)
13 March 1966	Collinsville 1 S, US	daily snowfall	26.7 cm (10.5 in)	14.0 cm (5.5 in)	27 years	31 of 100 (Routine)
25 February 1966	Collinsville 1 S, US	daily snowfall	30.5 cm (12.0 in)	25.4 cm (10.0 in)	3 years	36 of 100 (Notable)
25 February 1966	Collinsville 1 S, US	daily rain	29.2 mm (1.1 in)	19.0 mm (0.7 in)	0 years	24 of 100 (Routine)
14 February 1966	Collinsville 1 S, US	daily rain	43.7 mm (1.7 in)	22.9 mm (0.9 in)	23 years	34 of 100 (Routine)
31 January 1966	Collinsville 1 S, US	daily snowfall	7.6 cm (3.0 in)	0.5 cm (0.2 in)	20 years	9 of 100 (Routine)
30 January 1966	Collinsville 1 S, US	daily rain	12.2 mm (0.5 in)	1.5 mm (0.06 in)	34 years	19 of 100 (Routine)
30 January 1966	Collinsville 1 S, US	daily snowfall	12.7 cm (5.0 in)	6.3 cm (2.5 in)	20 years	18 of 100 (Routine)
24 January 1966	Collinsville 1 S, US	daily rain	24.1 mm (0.9 in)	2.8 mm (0.11 in)	32 years	19 of 100 (Routine)
23 January 1966	Collinsville 1 S, US	daily snowfall	6.4 cm (2.5 in)	1.3 cm (0.5 in)	34 years	15 of 100 (Routine)
8 October 1965	Collinsville 1 S, US	daily rain	49.0 mm (1.9 in)	2.8 mm (0.11 in)	14 years	14 of 100 (Routine)
2 October 1965	Collinsville 1 S, US	daily rain	24.4 mm (1.0 in)	1.5 mm (0.06 in)	7 years	11 of 100 (Routine)
19 July 1965	Collinsville 1 S, US	daily rain	23.6 mm (0.9 in)	11.4 mm (0.4 in)	27 years	20 of 100 (Routine)
19 April 1965	Collinsville 1 S, US	daily snowfall	2.5 cm (1.0 in)	2.5 cm (1.0 in)	36 years	18 of 100 (Routine)
21 March 1965	Collinsville 1 S, US	daily snowfall	10.2 cm (4.0 in)	3.1 cm (1.2 in)	20 years	13 of 100 (Routine)
25 February 1965	Collinsville 1 S, US	daily rain	10.2 mm (0.4 in)	1.6 mm (0.06 in)	11 years	12 of 100 (Routine)
17 January 1965	Collinsville 1 S, US	daily snowfall (Tie)	10.2 cm (4.0 in)	tie	20 years	2 of 100 (Routine)
3 January 1965	Collinsville 1 S, US	daily snowfall	12.7 cm (5.0 in)	2.5 cm (1.0 in)	24 years	13 of 100 (Routine)
28 December 1964	Collinsville 1 S, US	daily rain	31.5 mm (1.2 in)	12.4 mm (0.5 in)	22 years	24 of 100 (Routine)

Extremes by Year

1885 to 1966

Yearly extremes at Collinsville 1 S: the record and the median year
Measure	Record	Year of the record	Median year	Years with a value
Hottest day (TXx)	34.4 C (93.9 F)	1886	29.2 C (84.5 F)	4
Coldest night (TNn)	-31.7 C (-25.1 F)	1887	-26.1 C (-15.0 F)	4
Wettest day (Rx1day)	119.9 mm (4.7 in)	1934	59.6 mm (2.3 in)	42
Wettest five days (Rx5day)	228.0 mm (9.0 in)	1938	94.7 mm (3.7 in)	42
Longest dry spell (CDD)	35 days	1947	17 days	42

Hottest day (TXx)

The hottest day of the year at Collinsville 1 S, 1885 to 1966. The record is 34.4 C (93.9 F) in 1886, marked on the chart; the median year is 29.2 C (84.5 F).

Hottest day (TXx) at Collinsville 1 S by year
Year	Hottest day (TXx)
1885	33.9 C (93.0 F)
1886	34.4 C (93.9 F)
1887	24.4 C (75.9 F)
1928	n/a
1929	n/a
1930	n/a
1931	n/a
1932	n/a
1933	n/a
1934	n/a
1935	n/a
1936	n/a
1937	n/a
1938	n/a
1939	n/a
1940	n/a
1941	n/a
1942	n/a
1943	n/a
1944	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	17.8 C (64.0 F)
1961	n/a
1962	n/a
1963	n/a
1964	n/a
1965	n/a
1966	n/a

Coldest night (TNn)

The coldest night of the year at Collinsville 1 S, 1885 to 1966. The record is -31.7 C (-25.1 F) in 1887, marked on the chart; the median year is -26.1 C (-15.0 F).

Coldest night (TNn) at Collinsville 1 S by year
Year	Coldest night (TNn)
1885	-22.8 C (-9.0 F)
1886	-29.4 C (-20.9 F)
1887	-31.7 C (-25.1 F)
1928	n/a
1929	n/a
1930	n/a
1931	n/a
1932	n/a
1933	n/a
1934	n/a
1935	n/a
1936	n/a
1937	n/a
1938	n/a
1939	n/a
1940	n/a
1941	n/a
1942	n/a
1943	n/a
1944	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	-8.9 C (16.0 F)
1961	n/a
1962	n/a
1963	n/a
1964	n/a
1965	n/a
1966	n/a

Wettest day (Rx1day)

The wettest day of the year at Collinsville 1 S, 1885 to 1966. The record is 119.9 mm (4.7 in) in 1934, marked on the chart; the median year is 59.6 mm (2.3 in).

Wettest day (Rx1day) at Collinsville 1 S by year
Year	Wettest day (Rx1day)
1885	117.9 mm (4.6 in)
1886	83.3 mm (3.3 in)
1887	44.5 mm (1.8 in)
1928	35.3 mm (1.4 in)
1929	47.5 mm (1.9 in)
1930	34.3 mm (1.4 in)
1931	50.3 mm (2.0 in)
1932	58.4 mm (2.3 in)
1933	57.7 mm (2.3 in)
1934	119.9 mm (4.7 in)
1935	59.9 mm (2.4 in)
1936	73.9 mm (2.9 in)
1937	71.6 mm (2.8 in)
1938	77.7 mm (3.1 in)
1939	68.8 mm (2.7 in)
1940	90.9 mm (3.6 in)
1941	80.8 mm (3.2 in)
1942	52.3 mm (2.1 in)
1943	80.8 mm (3.2 in)
1944	110.2 mm (4.3 in)
1945	86.9 mm (3.4 in)
1946	73.7 mm (2.9 in)
1947	68.8 mm (2.7 in)
1948	104.9 mm (4.1 in)
1949	59.2 mm (2.3 in)
1950	62.5 mm (2.5 in)
1951	66.8 mm (2.6 in)
1952	96.0 mm (3.8 in)
1953	52.8 mm (2.1 in)
1954	59.2 mm (2.3 in)
1955	45.7 mm (1.8 in)
1956	46.2 mm (1.8 in)
1957	50.3 mm (2.0 in)
1958	61.7 mm (2.4 in)
1959	49.0 mm (1.9 in)
1960	101.1 mm (4.0 in)
1961	49.5 mm (1.9 in)
1962	51.8 mm (2.0 in)
1963	49.0 mm (1.9 in)
1964	37.3 mm (1.5 in)
1965	49.0 mm (1.9 in)
1966	44.2 mm (1.7 in)

Wettest five days (Rx5day)

The wettest five days of the year at Collinsville 1 S, 1885 to 1966. The record is 228.0 mm (9.0 in) in 1938, marked on the chart; the median year is 94.7 mm (3.7 in).

Wettest five days (Rx5day) at Collinsville 1 S by year
Year	Wettest five days (Rx5day)
1885	127.1 mm (5.0 in)
1886	126.2 mm (5.0 in)
1887	59.2 mm (2.3 in)
1928	43.5 mm (1.7 in)
1929	84.8 mm (3.3 in)
1930	51.6 mm (2.0 in)
1931	69.9 mm (2.8 in)
1932	93.2 mm (3.7 in)
1933	99.6 mm (3.9 in)
1934	146.6 mm (5.8 in)
1935	86.4 mm (3.4 in)
1936	86.1 mm (3.4 in)
1937	94.6 mm (3.7 in)
1938	228.0 mm (9.0 in)
1939	112.5 mm (4.4 in)
1940	99.3 mm (3.9 in)
1941	80.8 mm (3.2 in)
1942	110.5 mm (4.4 in)
1943	110.5 mm (4.4 in)
1944	161.2 mm (6.3 in)
1945	94.7 mm (3.7 in)
1946	148.9 mm (5.9 in)
1947	129.5 mm (5.1 in)
1948	130.0 mm (5.1 in)
1949	178.2 mm (7.0 in)
1950	83.1 mm (3.3 in)
1951	108.0 mm (4.3 in)
1952	115.1 mm (4.5 in)
1953	133.3 mm (5.2 in)
1954	112.3 mm (4.4 in)
1955	79.4 mm (3.1 in)
1956	66.5 mm (2.6 in)
1957	66.3 mm (2.6 in)
1958	110.7 mm (4.4 in)
1959	60.8 mm (2.4 in)
1960	140.3 mm (5.5 in)
1961	79.5 mm (3.1 in)
1962	79.9 mm (3.1 in)
1963	90.6 mm (3.6 in)
1964	58.9 mm (2.3 in)
1965	57.4 mm (2.3 in)
1966	63.0 mm (2.5 in)

Longest dry spell (CDD)

The longest dry spell of the year at Collinsville 1 S, 1885 to 1966. The record is 35 days in 1947, marked on the chart; the median year is 17 days.

Longest dry spell (CDD) at Collinsville 1 S by year
Year	Longest dry spell (CDD)
1885	21 days
1886	14 days
1887	3 days
1928	14 days
1929	19 days
1930	18 days
1931	14 days
1932	18 days
1933	15 days
1934	17 days
1935	20 days
1936	14 days
1937	10 days
1938	12 days
1939	27 days
1940	22 days
1941	19 days
1942	20 days
1943	19 days
1944	18 days
1945	12 days
1946	18 days
1947	35 days
1948	21 days
1949	14 days
1950	16 days
1951	12 days
1952	25 days
1953	25 days
1954	13 days
1955	14 days
1956	17 days
1957	16 days
1958	16 days
1959	10 days
1960	17 days
1961	13 days
1962	14 days
1963	23 days
1964	18 days
1965	16 days
1966	20 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.

Rainfall Return Levels

33 years, 1929 to 1965

A day with at least 64.8 mm (2.6 in) of rain is expected about once in 2 years. A day with at least 139.2 mm (5.5 in) of rain is expected about once in 100 years.

Rainfall return levels at Collinsville 1 S: the daily rain expected about once in a given number of years
Expected about once in	A day with at least	Note
2 years	64.8 mm (2.6 in)
5 years	84.2 mm (3.3 in)
10 years	97.3 mm (3.8 in)
25 years	114.0 mm (4.5 in)
50 years	126.6 mm (5.0 in)	Longer than the 33 years of record
100 years	139.2 mm (5.5 in)	Longer than the 33 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, 33 years of values from 1929 to 1965.

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: 119.9 mm (4.7 in) in 1934; 110.2 mm (4.3 in) in 1944; 104.9 mm (4.1 in) in 1948.

Download the Data

Data for Collinsville 1 S standing records by year: CSV or JSON. Field meanings are on the data page.
Data for Collinsville 1 S 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 2025-12-31. Last revised 31 December 2025 (2025-12-31).

Days with data per year at Collinsville 1 S
Year	Days with data	Share of year	Complete
1885	316	87%	No
1886	320	88%	No
1887	117	32%	No
1960	28	8%	No