Dorchester Weather Records (USC00132311)

Record envelope, standing records and threshold days for Dorchester (USC00132311), Iowa, United States, with 67 years of record.

Key Facts for Dorchester

Dorchester (USC00132311) is a weather station in Iowa, United States at 43.47 latitude and -91.51 longitude, 231 m (758 ft) above sea level.
The station reports from 1947 to 2013, 67 years of record.
0 records set at Dorchester still stand.
Records are tracked for prcp, snow, snwd: an element needs 30 years of data to be eligible.
Dorchester set a monthly record daily precipitation of 54.9 mm (2.2 in) on 4 October 2013.

About the Station

Location: Iowa, United States, 43.47 latitude, -91.51 longitude.
Elevation: 231 m (758 ft).
Period of record: 1947 to 2013, 67 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 Dorchester. 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 Dorchester, 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	n/a	n/a	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	n/a	n/a	n/a	n/a
Nov	n/a	n/a	n/a	n/a
Dec	n/a	n/a	n/a	n/a

Which Years Hold Standing Records

0 standing records

0 records at Dorchester still stand.

All-Time Record Progression

5 new records

5 all-time records were set at Dorchester between 3 February 1983 and 8 June 2008. Each dot is a new record.

When Dorchester set new all-time records
Date	Kind	Detail
1983-02-03	Record daily snowfall	Record daily snowfall 33.0 cm (13.0 in)
1983-12-31	Record daily snowfall	Record daily snowfall 45.7 cm (18.0 in)
1996-01-27	Record snow depth	Record snow depth 66.0 cm (26.0 in)
2000-06-01	Record daily precipitation	Record daily precipitation 130.3 mm (5.1 in)
2008-06-08	Record daily precipitation	Record daily precipitation 185.4 mm (7.3 in)

Wettest Day of Each Month

Jun: 185.4 mm (7.3 in)

The wettest day on record for each calendar month at Dorchester. The most was 185.4 mm (7.3 in) on 8 June 2008.

Record daily precipitation for each month at Dorchester
Month	Record daily precipitation (mm)	Date
Jan	45.7 mm (1.8 in)	15 January 1969
Feb	41.7 mm (1.6 in)	27 February 1998
Mar	42.7 mm (1.7 in)	23 March 1966
Apr	76.5 mm (3.0 in)	10 April 2013
May	69.6 mm (2.7 in)	18 May 2000
Jun	185.4 mm (7.3 in)	8 June 2008
Jul	89.2 mm (3.5 in)	1 July 1978
Aug	111.8 mm (4.4 in)	31 August 1962
Sep	106.9 mm (4.2 in)	25 September 1972
Oct	54.9 mm (2.2 in)	4 October 2013
Nov	116.8 mm (4.6 in)	28 November 1995
Dec	43.9 mm (1.7 in)	20 December 1952

Latest Records

Latest records at Dorchester
Date	Station	Record	Value	Beat old record by	Old record stood	Significance
4 October 2013	Dorchester, US	monthly rain	54.9 mm (2.2 in)	1.6 mm (0.06 in)	40 years	29 of 100 (Routine)
10 July 2013	Dorchester, US	daily rain	36.8 mm (1.4 in)	3.8 mm (0.15 in)	24 years	15 of 100 (Routine)
23 June 2013	Dorchester, US	daily rain	85.3 mm (3.4 in)	23.3 mm (0.9 in)	3 years	18 of 100 (Routine)
21 May 2013	Dorchester, US	daily rain	27.2 mm (1.1 in)	6.9 mm (0.27 in)	8 years	14 of 100 (Routine)
3 May 2013	Dorchester, US	daily rain	27.9 mm (1.1 in)	7.1 mm (0.28 in)	34 years	22 of 100 (Routine)
15 April 2013	Dorchester, US	daily rain	30.0 mm (1.2 in)	9.2 mm (0.36 in)	19 years	19 of 100 (Routine)
10 April 2013	Dorchester, US	monthly rain	76.5 mm (3.0 in)	5.1 mm (0.20 in)	37 years	31 of 100 (Routine)
20 December 2012	Dorchester, US	daily snowfall	16.8 cm (6.6 in)	1.6 cm (0.6 in)	60 years	26 of 100 (Routine)
10 December 2012	Dorchester, US	daily snowfall	8.9 cm (3.5 in)	2.8 cm (1.1 in)	51 years	25 of 100 (Routine)
8 November 2012	Dorchester, US	daily snowfall	1.3 cm (0.5 in)	1.3 cm (0.5 in)	65 years	20 of 100 (Routine)
26 October 2012	Dorchester, US	daily rain	13.2 mm (0.5 in)	0.5 mm (0.02 in)	65 years	20 of 100 (Routine)
15 October 2012	Dorchester, US	daily rain	13.2 mm (0.5 in)	1.3 mm (0.05 in)	29 years	15 of 100 (Routine)
4 September 2012	Dorchester, US	daily rain	48.8 mm (1.9 in)	13.2 mm (0.5 in)	7 years	16 of 100 (Routine)
24 August 2012	Dorchester, US	daily rain	46.7 mm (1.8 in)	5.6 mm (0.22 in)	55 years	25 of 100 (Routine)
20 April 2012	Dorchester, US	daily rain	58.9 mm (2.3 in)	13.2 mm (0.5 in)	61 years	35 of 100 (Notable)
29 February 2012	Dorchester, US	daily rain	20.3 mm (0.8 in)	20.3 mm (0.8 in)	60 years	20 of 100 (Routine)
4 December 2011	Dorchester, US	daily rain	18.8 mm (0.7 in)	2.8 mm (0.11 in)	64 years	20 of 100 (Routine)
2 September 2011	Dorchester, US	daily rain	20.3 mm (0.8 in)	2.0 mm (0.08 in)	44 years	20 of 100 (Routine)
19 June 2011	Dorchester, US	daily rain	52.1 mm (2.1 in)	22.1 mm (0.9 in)	12 years	20 of 100 (Routine)
10 May 2011	Dorchester, US	daily rain	25.1 mm (1.0 in)	5.3 mm (0.21 in)	6 years	12 of 100 (Routine)

Extremes by Year

1947 to 2013

Yearly extremes at Dorchester: the record and the median year
Measure	Record	Year of the record	Median year	Years with a value
Wettest day (Rx1day)	185.4 mm (7.3 in)	2008	63.5 mm (2.5 in)	67
Wettest five days (Rx5day)	294.6 mm (11.6 in)	2008	96.6 mm (3.8 in)	67
Longest dry spell (CDD)	59 days	1952	25 days	67

Wettest day (Rx1day)

The wettest day of the year at Dorchester, 1947 to 2013. The record is 185.4 mm (7.3 in) in 2008, marked on the chart; the median year is 63.5 mm (2.5 in).

Wettest day (Rx1day) at Dorchester by year
Year	Wettest day (Rx1day)
1947	87.4 mm (3.4 in)
1948	63.5 mm (2.5 in)
1949	61.5 mm (2.4 in)
1950	81.3 mm (3.2 in)
1951	76.2 mm (3.0 in)
1952	50.8 mm (2.0 in)
1953	70.4 mm (2.8 in)
1954	63.8 mm (2.5 in)
1955	39.1 mm (1.5 in)
1956	41.4 mm (1.6 in)
1957	61.0 mm (2.4 in)
1958	72.4 mm (2.9 in)
1959	71.1 mm (2.8 in)
1960	56.9 mm (2.2 in)
1961	38.1 mm (1.5 in)
1962	111.8 mm (4.4 in)
1963	45.7 mm (1.8 in)
1964	120.7 mm (4.8 in)
1965	57.9 mm (2.3 in)
1966	47.2 mm (1.9 in)
1967	41.1 mm (1.6 in)
1968	32.5 mm (1.3 in)
1969	63.5 mm (2.5 in)
1970	85.3 mm (3.4 in)
1971	39.1 mm (1.5 in)
1972	106.9 mm (4.2 in)
1973	61.7 mm (2.4 in)
1974	118.1 mm (4.6 in)
1975	71.4 mm (2.8 in)
1976	64.8 mm (2.6 in)
1977	73.7 mm (2.9 in)
1978	115.6 mm (4.6 in)
1979	38.1 mm (1.5 in)
1980	58.4 mm (2.3 in)
1981	64.8 mm (2.6 in)
1982	87.6 mm (3.4 in)
1983	81.3 mm (3.2 in)
1984	53.3 mm (2.1 in)
1985	63.5 mm (2.5 in)
1986	76.2 mm (3.0 in)
1987	49.5 mm (1.9 in)
1988	47.2 mm (1.9 in)
1989	50.8 mm (2.0 in)
1990	55.9 mm (2.2 in)
1991	83.8 mm (3.3 in)
1992	50.3 mm (2.0 in)
1993	66.5 mm (2.6 in)
1994	59.4 mm (2.3 in)
1995	116.8 mm (4.6 in)
1996	57.2 mm (2.3 in)
1997	45.2 mm (1.8 in)
1998	50.0 mm (2.0 in)
1999	73.4 mm (2.9 in)
2000	130.3 mm (5.1 in)
2001	77.5 mm (3.1 in)
2002	36.3 mm (1.4 in)
2003	34.5 mm (1.4 in)
2004	58.9 mm (2.3 in)
2005	77.5 mm (3.1 in)
2006	53.3 mm (2.1 in)
2007	89.9 mm (3.5 in)
2008	185.4 mm (7.3 in)
2009	63.2 mm (2.5 in)
2010	96.0 mm (3.8 in)
2011	52.1 mm (2.1 in)
2012	58.9 mm (2.3 in)
2013	85.3 mm (3.4 in)

Wettest five days (Rx5day)

The wettest five days of the year at Dorchester, 1947 to 2013. The record is 294.6 mm (11.6 in) in 2008, marked on the chart; the median year is 96.6 mm (3.8 in).

Wettest five days (Rx5day) at Dorchester by year
Year	Wettest five days (Rx5day)
1947	124.7 mm (4.9 in)
1948	82.6 mm (3.3 in)
1949	83.9 mm (3.3 in)
1950	154.9 mm (6.1 in)
1951	48.8 mm (1.9 in)
1952	80.5 mm (3.2 in)
1953	131.1 mm (5.2 in)
1954	109.7 mm (4.3 in)
1955	55.6 mm (2.2 in)
1956	57.2 mm (2.3 in)
1957	96.6 mm (3.8 in)
1958	72.4 mm (2.9 in)
1959	93.2 mm (3.7 in)
1960	71.9 mm (2.8 in)
1961	62.2 mm (2.4 in)
1962	135.9 mm (5.4 in)
1963	49.3 mm (1.9 in)
1964	130.6 mm (5.1 in)
1965	82.7 mm (3.3 in)
1966	50.7 mm (2.0 in)
1967	50.1 mm (2.0 in)
1968	59.9 mm (2.4 in)
1969	136.7 mm (5.4 in)
1970	119.8 mm (4.7 in)
1971	44.0 mm (1.7 in)
1972	156.5 mm (6.2 in)
1973	73.4 mm (2.9 in)
1974	121.9 mm (4.8 in)
1975	109.0 mm (4.3 in)
1976	103.5 mm (4.1 in)
1977	112.8 mm (4.4 in)
1978	154.5 mm (6.1 in)
1979	87.6 mm (3.4 in)
1980	120.4 mm (4.7 in)
1981	85.6 mm (3.4 in)
1982	96.5 mm (3.8 in)
1983	152.4 mm (6.0 in)
1984	84.8 mm (3.3 in)
1985	110.5 mm (4.4 in)
1986	86.4 mm (3.4 in)
1987	69.8 mm (2.7 in)
1988	106.5 mm (4.2 in)
1989	70.4 mm (2.8 in)
1990	117.3 mm (4.6 in)
1991	109.6 mm (4.3 in)
1992	96.8 mm (3.8 in)
1993	123.7 mm (4.9 in)
1994	74.7 mm (2.9 in)
1995	116.8 mm (4.6 in)
1996	66.3 mm (2.6 in)
1997	78.2 mm (3.1 in)
1998	101.8 mm (4.0 in)
1999	85.8 mm (3.4 in)
2000	160.0 mm (6.3 in)
2001	127.0 mm (5.0 in)
2002	55.1 mm (2.2 in)
2003	63.6 mm (2.5 in)
2004	158.3 mm (6.2 in)
2005	187.3 mm (7.4 in)
2006	90.1 mm (3.5 in)
2007	142.0 mm (5.6 in)
2008	294.6 mm (11.6 in)
2009	105.9 mm (4.2 in)
2010	112.5 mm (4.4 in)
2011	94.3 mm (3.7 in)
2012	84.1 mm (3.3 in)
2013	260.6 mm (10.3 in)

Longest dry spell (CDD)

The longest dry spell of the year at Dorchester, 1947 to 2013. The record is 59 days in 1952, marked on the chart; the median year is 25 days.

Longest dry spell (CDD) at Dorchester by year
Year	Longest dry spell (CDD)
1947	19 days
1948	28 days
1949	33 days
1950	31 days
1951	21 days
1952	59 days
1953	27 days
1954	25 days
1955	16 days
1956	25 days
1957	29 days
1958	49 days
1959	26 days
1960	19 days
1961	23 days
1962	46 days
1963	27 days
1964	34 days
1965	28 days
1966	38 days
1967	28 days
1968	13 days
1969	47 days
1970	24 days
1971	24 days
1972	27 days
1973	33 days
1974	15 days
1975	18 days
1976	32 days
1977	17 days
1978	20 days
1979	30 days
1980	31 days
1981	30 days
1982	17 days
1983	19 days
1984	21 days
1985	15 days
1986	25 days
1987	30 days
1988	32 days
1989	33 days
1990	18 days
1991	22 days
1992	24 days
1993	22 days
1994	35 days
1995	24 days
1996	30 days
1997	32 days
1998	39 days
1999	22 days
2000	21 days
2001	24 days
2002	22 days
2003	21 days
2004	26 days
2005	15 days
2006	22 days
2007	25 days
2008	23 days
2009	25 days
2010	29 days
2011	15 days
2012	27 days
2013	22 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

50 years, 1949 to 2012

A day with at least 63.1 mm (2.5 in) of rain is expected about once in 2 years. A day with at least 180.9 mm (7.1 in) of rain is expected about once in 100 years.

Rainfall return levels at Dorchester: the daily rain expected about once in a given number of years
Expected about once in	A day with at least	Note
2 years	63.1 mm (2.5 in)
5 years	86.7 mm (3.4 in)
10 years	105.0 mm (4.1 in)
25 years	132.0 mm (5.2 in)
50 years	155.0 mm (6.1 in)
100 years	180.9 mm (7.1 in)	Longer than the 50 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, 50 years of values from 1949 to 2012.

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: 185.4 mm (7.3 in) in 2008; 130.3 mm (5.1 in) in 2000; 120.7 mm (4.8 in) in 1964.

Download the Data

Data for Dorchester standing records by year: CSV or JSON. Field meanings are on the data page.
Data for Dorchester 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 2026-10-16 (16 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).

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	n/a	n/a	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	n/a	n/a	n/a	n/a
Nov	n/a	n/a	n/a	n/a
Dec	n/a	n/a	n/a	n/a

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	n/a	n/a	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	n/a	n/a	n/a	n/a
Nov	n/a	n/a	n/a	n/a
Dec	n/a	n/a	n/a	n/a