South Londonderry Weather Records (USC00437617)

Record envelope, standing records and threshold days for South Londonderry (USC00437617), Vermont, United States, with 55 years of record.

Key Facts for South Londonderry

South Londonderry (USC00437617) is a weather station in Vermont, United States at 43.18 latitude and -72.82 longitude, 320 m (1,050 ft) above sea level.
The station reports from 1930 to 1984, 55 years of record.
360 records set at South Londonderry still stand.
Records are tracked for prcp, snow, snwd: an element needs 30 years of data to be eligible.
South Londonderry set a daily record snowfall of 17.8 cm (7.0 in) on 30 March 1984.

About the Station

Location: Vermont, United States, 43.18 latitude, -72.82 longitude.
Elevation: 320 m (1,050 ft).
Period of record: 1930 to 1984, 55 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 South Londonderry. 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 South Londonderry, with 2026 drawn through them
Month	Highest record high	Lowest record low	2026 highest maximum	2026 lowest minimum
Jan	n/a	n/a	n/a	n/a
Feb	n/a	n/a	n/a	n/a
Mar	n/a	n/a	n/a	n/a
Apr	n/a	n/a	n/a	n/a
May	n/a	n/a	n/a	n/a
Jun	36.7 C (98.1 F)	-1.1 C (30.0 F)	n/a	n/a
Jul	n/a	n/a	n/a	n/a
Aug	n/a	n/a	n/a	n/a
Sep	n/a	n/a	n/a	n/a
Oct	23.3 C (73.9 F)	-9.4 C (15.1 F)	n/a	n/a
Nov	22.2 C (72.0 F)	-12.2 C (10.0 F)	n/a	n/a
Dec	n/a	n/a	n/a	n/a

Which Years Hold Standing Records

360 standing records

360 records at South Londonderry still stand. 1965 holds the most, with 120.

All-Time Record Progression

2 new records

2 all-time records were set at South Londonderry between 30 June 1973 and 14 March 1984. Each dot is a new record.

When South Londonderry set new all-time records
Date	Kind	Detail
1973-06-30	Record daily precipitation	Record daily precipitation 163.6 mm (6.4 in)
1984-03-14	Record daily snowfall	Record daily snowfall 63.5 cm (25.0 in)

Wettest Day of Each Month

Jun: 163.6 mm (6.4 in)

The wettest day on record for each calendar month at South Londonderry. The most was 163.6 mm (6.4 in) on 30 June 1973.

Record daily precipitation for each month at South Londonderry
Month	Record daily precipitation (mm)	Date
Jan	55.9 mm (2.2 in)	9 January 1978
Feb	56.4 mm (2.2 in)	8 February 1941
Mar	58.2 mm (2.3 in)	14 March 1984
Apr	79.0 mm (3.1 in)	3 April 1970
May	66.0 mm (2.6 in)	25 May 1979
Jun	163.6 mm (6.4 in)	30 June 1973
Jul	67.3 mm (2.6 in)	15 July 1943
Aug	88.9 mm (3.5 in)	10 August 1976
Sep	78.7 mm (3.1 in)	13 September 1960
Oct	77.5 mm (3.1 in)	17 October 1955
Nov	75.2 mm (3.0 in)	9 November 1943
Dec	88.4 mm (3.5 in)	31 December 1948

Period of Record Coverage

1965 to 1968

3 years of record at South Londonderry, 1965 to 1968. 3 years have data for under 90 percent of days and are left out of rankings: 1965, 1966, 1968.

Latest Records

Latest records at South Londonderry
Date	Station	Record	Value	Beat old record by	Old record stood	Significance
30 March 1984	South Londonderry, US	daily snowfall	17.8 cm (7.0 in)	1.3 cm (0.5 in)	19 years	11 of 100 (Routine)
14 March 1984	South Londonderry, US	all-time snowfall	63.5 cm (25.0 in)	9.4 cm (3.7 in)	50 years	51 of 100 (Notable)
14 March 1984	South Londonderry, US	monthly rain	58.2 mm (2.3 in)	1.8 mm (0.07 in)	9 years	18 of 100 (Routine)
6 March 1984	South Londonderry, US	daily snowfall (Tie)	12.7 cm (5.0 in)	tie	25 years	3 of 100 (Routine)
11 January 1984	South Londonderry, US	daily snowfall	20.3 cm (8.0 in)	2.5 cm (1.0 in)	6 years	10 of 100 (Routine)
23 December 1983	South Londonderry, US	daily rain	24.1 mm (0.9 in)	3.5 mm (0.14 in)	14 years	12 of 100 (Routine)
13 December 1983	South Londonderry, US	daily rain	31.0 mm (1.2 in)	10.2 mm (0.4 in)	24 years	21 of 100 (Routine)
5 December 1983	South Londonderry, US	daily snowfall	17.8 cm (7.0 in)	10.2 cm (4.0 in)	18 years	23 of 100 (Routine)
25 November 1983	South Londonderry, US	daily rain	28.4 mm (1.1 in)	0.5 mm (0.02 in)	24 years	12 of 100 (Routine)
16 November 1983	South Londonderry, US	daily rain (Tie)	23.4 mm (0.9 in)	tie	52 years	5 of 100 (Routine)
22 September 1983	South Londonderry, US	daily rain	43.7 mm (1.7 in)	26.2 mm (1.0 in)	36 years	39 of 100 (Notable)
20 April 1983	South Londonderry, US	daily rain	28.7 mm (1.1 in)	5.8 mm (0.23 in)	40 years	22 of 100 (Routine)
19 April 1983	South Londonderry, US	daily snowfall (Tie)	5.1 cm (2.0 in)	tie	33 years	3 of 100 (Routine)
17 April 1983	South Londonderry, US	daily snowfall	17.8 cm (7.0 in)	12.0 cm (4.7 in)	50 years	31 of 100 (Routine)
17 April 1983	South Londonderry, US	daily rain	36.8 mm (1.4 in)	15.5 mm (0.6 in)	21 years	25 of 100 (Routine)
11 April 1983	South Londonderry, US	daily rain	43.9 mm (1.7 in)	19.0 mm (0.7 in)	21 years	29 of 100 (Routine)
24 January 1983	South Londonderry, US	daily rain	34.5 mm (1.4 in)	9.1 mm (0.36 in)	16 years	20 of 100 (Routine)
16 January 1983	South Londonderry, US	daily rain	29.2 mm (1.1 in)	10.9 mm (0.4 in)	20 years	23 of 100 (Routine)
11 January 1983	South Londonderry, US	daily rain	34.3 mm (1.4 in)	23.6 mm (0.9 in)	8 years	34 of 100 (Routine)
1 August 1982	South Londonderry, US	daily rain	21.8 mm (0.9 in)	9.1 mm (0.36 in)	20 years	18 of 100 (Routine)

Extremes by Year

1930 to 1984

Yearly extremes at South Londonderry: the record and the median year
Measure	Record	Year of the record	Median year	Years with a value
Hottest day (TXx)	36.7 C (98.1 F)	1966	23.3 C (73.9 F)	3
Coldest night (TNn)	-12.2 C (10.0 F)	1965	-9.4 C (15.1 F)	3
Wettest day (Rx1day)	163.6 mm (6.4 in)	1973	53.3 mm (2.1 in)	49
Wettest five days (Rx5day)	243.1 mm (9.6 in)	1973	84.7 mm (3.3 in)	49
Longest dry spell (CDD)	29 days	1941	16 days	49

Hottest day (TXx)

The hottest day of the year at South Londonderry, 1930 to 1984. The record is 36.7 C (98.1 F) in 1966, marked on the chart; the median year is 23.3 C (73.9 F).

Hottest day (TXx) at South Londonderry by year
Year	Hottest day (TXx)
1930	n/a
1931	n/a
1932	n/a
1933	n/a
1934	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
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	n/a
1964	n/a
1965	22.2 C (72.0 F)
1966	36.7 C (98.1 F)
1967	n/a
1968	23.3 C (73.9 F)
1969	n/a
1970	n/a
1971	n/a
1972	n/a
1973	n/a
1974	n/a
1975	n/a
1976	n/a
1977	n/a
1978	n/a
1979	n/a
1980	n/a
1981	n/a
1982	n/a
1983	n/a
1984	n/a

Coldest night (TNn)

The coldest night of the year at South Londonderry, 1930 to 1984. The record is -12.2 C (10.0 F) in 1965, marked on the chart; the median year is -9.4 C (15.1 F).

Coldest night (TNn) at South Londonderry by year
Year	Coldest night (TNn)
1930	n/a
1931	n/a
1932	n/a
1933	n/a
1934	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
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	n/a
1964	n/a
1965	-12.2 C (10.0 F)
1966	-1.1 C (30.0 F)
1967	n/a
1968	-9.4 C (15.1 F)
1969	n/a
1970	n/a
1971	n/a
1972	n/a
1973	n/a
1974	n/a
1975	n/a
1976	n/a
1977	n/a
1978	n/a
1979	n/a
1980	n/a
1981	n/a
1982	n/a
1983	n/a
1984	n/a

Wettest day (Rx1day)

The wettest day of the year at South Londonderry, 1930 to 1984. The record is 163.6 mm (6.4 in) in 1973, marked on the chart; the median year is 53.3 mm (2.1 in).

Wettest day (Rx1day) at South Londonderry by year
Year	Wettest day (Rx1day)
1930	43.7 mm (1.7 in)
1931	53.1 mm (2.1 in)
1932	45.7 mm (1.8 in)
1933	74.4 mm (2.9 in)
1934	36.6 mm (1.4 in)
1940	32.5 mm (1.3 in)
1941	58.7 mm (2.3 in)
1942	37.6 mm (1.5 in)
1943	75.2 mm (3.0 in)
1944	41.9 mm (1.6 in)
1945	33.0 mm (1.3 in)
1946	40.4 mm (1.6 in)
1947	57.7 mm (2.3 in)
1948	88.4 mm (3.5 in)
1949	43.2 mm (1.7 in)
1951	66.0 mm (2.6 in)
1952	78.0 mm (3.1 in)
1953	53.8 mm (2.1 in)
1954	59.7 mm (2.4 in)
1955	77.5 mm (3.1 in)
1956	53.3 mm (2.1 in)
1957	58.2 mm (2.3 in)
1958	45.7 mm (1.8 in)
1959	50.0 mm (2.0 in)
1960	78.7 mm (3.1 in)
1961	40.6 mm (1.6 in)
1962	40.1 mm (1.6 in)
1963	42.7 mm (1.7 in)
1964	36.6 mm (1.4 in)
1965	39.6 mm (1.6 in)
1966	63.5 mm (2.5 in)
1967	50.8 mm (2.0 in)
1968	53.3 mm (2.1 in)
1969	78.0 mm (3.1 in)
1970	79.0 mm (3.1 in)
1971	50.3 mm (2.0 in)
1972	56.4 mm (2.2 in)
1973	163.6 mm (6.4 in)
1974	56.4 mm (2.2 in)
1975	66.0 mm (2.6 in)
1976	88.9 mm (3.5 in)
1977	58.4 mm (2.3 in)
1978	55.9 mm (2.2 in)
1979	66.0 mm (2.6 in)
1980	47.2 mm (1.9 in)
1981	34.0 mm (1.3 in)
1982	44.5 mm (1.8 in)
1983	43.9 mm (1.7 in)
1984	58.2 mm (2.3 in)

Wettest five days (Rx5day)

The wettest five days of the year at South Londonderry, 1930 to 1984. The record is 243.1 mm (9.6 in) in 1973, marked on the chart; the median year is 84.7 mm (3.3 in).

Wettest five days (Rx5day) at South Londonderry by year
Year	Wettest five days (Rx5day)
1930	60.5 mm (2.4 in)
1931	71.9 mm (2.8 in)
1932	75.7 mm (3.0 in)
1933	75.4 mm (3.0 in)
1934	61.5 mm (2.4 in)
1940	64.4 mm (2.5 in)
1941	92.0 mm (3.6 in)
1942	51.8 mm (2.0 in)
1943	109.0 mm (4.3 in)
1944	102.9 mm (4.1 in)
1945	49.5 mm (1.9 in)
1946	59.9 mm (2.4 in)
1947	114.1 mm (4.5 in)
1948	138.4 mm (5.4 in)
1949	156.7 mm (6.2 in)
1951	90.9 mm (3.6 in)
1952	106.2 mm (4.2 in)
1953	75.4 mm (3.0 in)
1954	100.3 mm (3.9 in)
1955	178.3 mm (7.0 in)
1956	62.4 mm (2.5 in)
1957	83.1 mm (3.3 in)
1958	85.2 mm (3.4 in)
1959	86.2 mm (3.4 in)
1960	120.9 mm (4.8 in)
1961	99.0 mm (3.9 in)
1962	89.9 mm (3.5 in)
1963	73.2 mm (2.9 in)
1964	74.6 mm (2.9 in)
1965	46.5 mm (1.8 in)
1966	96.8 mm (3.8 in)
1967	66.0 mm (2.6 in)
1968	64.2 mm (2.5 in)
1969	114.8 mm (4.5 in)
1970	93.3 mm (3.7 in)
1971	85.4 mm (3.4 in)
1972	70.9 mm (2.8 in)
1973	243.1 mm (9.6 in)
1974	90.7 mm (3.6 in)
1975	95.5 mm (3.8 in)
1976	136.1 mm (5.4 in)
1977	80.5 mm (3.2 in)
1978	69.9 mm (2.8 in)
1979	116.3 mm (4.6 in)
1980	83.3 mm (3.3 in)
1981	84.7 mm (3.3 in)
1982	81.8 mm (3.2 in)
1983	73.4 mm (2.9 in)
1984	65.1 mm (2.6 in)

Longest dry spell (CDD)

The longest dry spell of the year at South Londonderry, 1930 to 1984. The record is 29 days in 1941, marked on the chart; the median year is 16 days.

Longest dry spell (CDD) at South Londonderry by year
Year	Longest dry spell (CDD)
1930	17 days
1931	18 days
1932	20 days
1933	9 days
1934	9 days
1940	9 days
1941	29 days
1942	20 days
1943	16 days
1944	16 days
1945	11 days
1946	14 days
1947	11 days
1948	19 days
1949	19 days
1951	12 days
1952	24 days
1953	25 days
1954	12 days
1955	26 days
1956	18 days
1957	13 days
1958	21 days
1959	15 days
1960	11 days
1961	14 days
1962	18 days
1963	27 days
1964	20 days
1965	12 days
1966	23 days
1967	19 days
1968	22 days
1969	15 days
1970	17 days
1971	13 days
1972	13 days
1973	14 days
1974	11 days
1975	14 days
1976	17 days
1977	17 days
1978	17 days
1979	15 days
1980	23 days
1981	13 days
1982	12 days
1983	12 days
1984	7 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

36 years, 1931 to 1983

A day with at least 54.4 mm (2.1 in) of rain is expected about once in 2 years. A day with at least 145.3 mm (5.7 in) of rain is expected about once in 100 years.

Rainfall return levels at South Londonderry: the daily rain expected about once in a given number of years
Expected about once in	A day with at least	Note
2 years	54.4 mm (2.1 in)
5 years	72.1 mm (2.8 in)
10 years	86.1 mm (3.4 in)
25 years	106.9 mm (4.2 in)
50 years	124.9 mm (4.9 in)	Longer than the 36 years of record
100 years	145.3 mm (5.7 in)	Longer than the 36 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, 36 years of values from 1931 to 1983.

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: 163.6 mm (6.4 in) in 1973; 88.9 mm (3.5 in) in 1976; 88.4 mm (3.5 in) in 1948.

Download the Data

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