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Built 2026-10-18 (18 October 2026)

Jefferson Weather Records (USC00193931)

Record envelope, standing records and threshold days for Jefferson (USC00193931), Massachusetts, United States, with 63 years of record.

Key Facts for Jefferson

  • Jefferson (USC00193931) is a weather station in Massachusetts, United States at 42.37 latitude and -71.90 longitude, 247 m (810 ft) above sea level.
  • The station reports from 1897 to 1959, 63 years of record.
  • 0 records set at Jefferson still stand.
  • Records are tracked for prcp: an element needs 30 years of data to be eligible.
  • Jefferson set a monthly record daily precipitation of 140.2 mm (5.5 in) on 21 July 1959.

About the Station

  • Location: Massachusetts, United States, 42.37 latitude, -71.90 longitude.
  • Elevation: 247 m (810 ft).
  • Period of record: 1897 to 1959, 63 years.
  • Eligible elements: prcp.

Daily Record Envelope and 2026

0 days at or beyond a record
Daily record high and record low at Jefferson, with 2026 drawn through them The band shows the record high and record low for each calendar day at Jefferson. The lines show the 2026 daily maximum and minimum. 0 days in 2026 matched or passed a record. Temperatures are in degrees Celsius. 000111 JanFebMarAprMayJunJulAugSepOctNovDec
The band shows the record high and record low for each calendar day at Jefferson. 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 Jefferson, with 2026 drawn through them
MonthHighest record highLowest record low2026 highest maximum2026 lowest minimum
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Which Years Hold Standing Records

0 standing records
Standing records at Jefferson by the year they were set 0 records at Jefferson still stand. 00000000000
0 records at Jefferson still stand.
Standing records at Jefferson by the year they were set
Year setStanding records

All-Time Record Progression

1 new records
When Jefferson set new all-time records 1 all-time records were set at Jefferson between 21 September 1938 and 21 September 1938. Each dot is a new record. Record daily precipitation21 September 1938: Record daily precipitation 257.0 mm (10.1 in)
1 all-time records were set at Jefferson between 21 September 1938 and 21 September 1938. Each dot is a new record.
When Jefferson set new all-time records
DateKindDetail
1938-09-21Record daily precipitationRecord daily precipitation 257.0 mm (10.1 in)

Wettest Day of Each Month

Sep: 257.0 mm (10.1 in)
Record daily precipitation for each month at Jefferson The wettest day on record for each calendar month at Jefferson. The most was 257.0 mm (10.1 in) on 21 September 1938. 0100200300 Jan: 71.1 mm (2.8 in), 10 January 1935 Jan Feb: 88.9 mm (3.5 in), 25 February 1916 Feb Mar: 131.6 mm (5.2 in), 19 March 1936 Mar Apr: 103.4 mm (4.1 in), 29 April 1904 Apr May: 120.7 mm (4.8 in), 28 May 1906 May Jun: 129.8 mm (5.1 in), 11 June 1931 Jun Jul: 140.2 mm (5.5 in), 21 July 1959 Jul Aug: 98.8 mm (3.9 in), 11 August 1898 Aug Sep: 257.0 mm (10.1 in), 21 September 1938 Sep Oct: 137.2 mm (5.4 in), 20 October 1932 Oct Nov: 108.5 mm (4.3 in), 4 November 1927 Nov Dec: 97.3 mm (3.8 in), 31 December 1942 Dec
The wettest day on record for each calendar month at Jefferson. The most was 257.0 mm (10.1 in) on 21 September 1938.
Record daily precipitation for each month at Jefferson
MonthRecord daily precipitation (mm)Date
Jan71.1 mm (2.8 in)10 January 1935
Feb88.9 mm (3.5 in)25 February 1916
Mar131.6 mm (5.2 in)19 March 1936
Apr103.4 mm (4.1 in)29 April 1904
May120.7 mm (4.8 in)28 May 1906
Jun129.8 mm (5.1 in)11 June 1931
Jul140.2 mm (5.5 in)21 July 1959
Aug98.8 mm (3.9 in)11 August 1898
Sep257.0 mm (10.1 in)21 September 1938
Oct137.2 mm (5.4 in)20 October 1932
Nov108.5 mm (4.3 in)4 November 1927
Dec97.3 mm (3.8 in)31 December 1942

Latest Records

20
Latest records at Jefferson
DateStationRecordValueBeat old record byOld record stoodSignificance
21 July 1959Jefferson, USmonthly rain140.2 mm (5.5 in)19.5 mm (0.8 in)62 years47 of 100 (Notable)
11 July 1959Jefferson, USdaily rain42.4 mm (1.7 in)5.6 mm (0.22 in)6 years11 of 100 (Routine)
3 April 1959Jefferson, USdaily rain39.6 mm (1.6 in)2.3 mm (0.09 in)46 years21 of 100 (Routine)
8 January 1958Jefferson, USdaily rain68.6 mm (2.7 in)37.6 mm (1.5 in)44 years48 of 100 (Notable)
19 October 1957Jefferson, USdaily rain26.9 mm (1.1 in)2.0 mm (0.08 in)40 years19 of 100 (Routine)
9 April 1957Jefferson, USdaily rain27.4 mm (1.1 in)0.2 mm (0.01 in)16 years11 of 100 (Routine)
7 September 1956Jefferson, USdaily rain50.5 mm (2.0 in)5.3 mm (0.21 in)2 years7 of 100 (Routine)
10 August 1956Jefferson, USdaily rain18.8 mm (0.7 in)7.4 mm (0.29 in)32 years19 of 100 (Routine)
17 March 1956Jefferson, USdaily rain42.7 mm (1.7 in)5.6 mm (0.22 in)18 years14 of 100 (Routine)
24 September 1955Jefferson, USdaily rain53.3 mm (2.1 in)9.6 mm (0.38 in)56 years25 of 100 (Routine)
1 June 1955Jefferson, USdaily rain16.0 mm (0.6 in)14.7 mm (0.6 in)20 years19 of 100 (Routine)
11 September 1954Jefferson, USdaily rain128.5 mm (5.1 in)81.0 mm (3.2 in)35 years45 of 100 (Notable)
7 September 1954Jefferson, USdaily rain45.2 mm (1.8 in)22.8 mm (0.9 in)28 years21 of 100 (Routine)
18 April 1954Jefferson, USdaily rain89.4 mm (3.5 in)51.0 mm (2.0 in)24 years43 of 100 (Notable)
26 October 1953Jefferson, USdaily rain37.6 mm (1.5 in)9.2 mm (0.36 in)54 years26 of 100 (Routine)
7 October 1953Jefferson, USdaily rain34.3 mm (1.4 in)20.6 mm (0.8 in)42 years28 of 100 (Routine)
27 April 1953Jefferson, USdaily rain17.8 mm (0.7 in)9.2 mm (0.36 in)3 years10 of 100 (Routine)
14 April 1953Jefferson, USdaily rain48.3 mm (1.9 in)15.5 mm (0.6 in)4 years15 of 100 (Routine)
2 September 1952Jefferson, USdaily rain63.5 mm (2.5 in)24.6 mm (1.0 in)25 years21 of 100 (Routine)
11 July 1952Jefferson, USdaily rain36.8 mm (1.4 in)17.7 mm (0.7 in)35 years26 of 100 (Routine)

Extremes by Year

1897 to 1959
Yearly extremes at Jefferson: the record and the median year
MeasureRecordYear of the recordMedian yearYears with a value
Wettest day (Rx1day)257.0 mm (10.1 in)193880.3 mm (3.2 in)63
Wettest five days (Rx5day)257.0 mm (10.1 in)193891.5 mm (3.6 in)61
Longest dry spell (CDD)38 days194716 days63

Wettest day (Rx1day)

Wettest day (Rx1day) at Jefferson by year The wettest day of the year at Jefferson, 1897 to 1959. The record is 257.0 mm (10.1 in) in 1938, marked on the chart; the median year is 80.3 mm (3.2 in). 0100200300190019201940Record: 257.0 mm (10.1 in) in 1938
The wettest day of the year at Jefferson, 1897 to 1959. The record is 257.0 mm (10.1 in) in 1938, marked on the chart; the median year is 80.3 mm (3.2 in).
Wettest day (Rx1day) at Jefferson by year
YearWettest day (Rx1day)
1897120.7 mm (4.8 in)
189898.8 mm (3.9 in)
189966.0 mm (2.6 in)
190080.0 mm (3.1 in)
190199.1 mm (3.9 in)
190276.2 mm (3.0 in)
190376.5 mm (3.0 in)
1904103.9 mm (4.1 in)
1905136.7 mm (5.4 in)
1906120.7 mm (4.8 in)
190794.0 mm (3.7 in)
190864.5 mm (2.5 in)
190983.8 mm (3.3 in)
191050.5 mm (2.0 in)
191189.9 mm (3.5 in)
191244.7 mm (1.8 in)
191391.2 mm (3.6 in)
191457.9 mm (2.3 in)
191592.5 mm (3.6 in)
191688.9 mm (3.5 in)
191750.0 mm (2.0 in)
191857.9 mm (2.3 in)
191994.0 mm (3.7 in)
192099.3 mm (3.9 in)
192194.7 mm (3.7 in)
192293.5 mm (3.7 in)
1923102.6 mm (4.0 in)
192459.7 mm (2.4 in)
192574.2 mm (2.9 in)
192654.1 mm (2.1 in)
1927108.5 mm (4.3 in)
192877.7 mm (3.1 in)
192946.7 mm (1.8 in)
193049.8 mm (2.0 in)
1931129.8 mm (5.1 in)
1932146.3 mm (5.8 in)
1933180.1 mm (7.1 in)
193490.4 mm (3.6 in)
193571.1 mm (2.8 in)
1936131.6 mm (5.2 in)
1937106.4 mm (4.2 in)
1938257.0 mm (10.1 in)
193980.3 mm (3.2 in)
194078.7 mm (3.1 in)
194161.5 mm (2.4 in)
194297.3 mm (3.8 in)
194350.8 mm (2.0 in)
1944154.9 mm (6.1 in)
194549.3 mm (1.9 in)
194683.8 mm (3.3 in)
194777.0 mm (3.0 in)
194861.7 mm (2.4 in)
194948.3 mm (1.9 in)
195097.3 mm (3.8 in)
195158.2 mm (2.3 in)
195263.5 mm (2.5 in)
195359.7 mm (2.4 in)
1954128.5 mm (5.1 in)
195553.3 mm (2.1 in)
195650.5 mm (2.0 in)
195737.1 mm (1.5 in)
195868.6 mm (2.7 in)
1959140.2 mm (5.5 in)

Wettest five days (Rx5day)

Wettest five days (Rx5day) at Jefferson by year The wettest five days of the year at Jefferson, 1897 to 1959. The record is 257.0 mm (10.1 in) in 1938, marked on the chart; the median year is 91.5 mm (3.6 in). 0100200300190019201940Record: 257.0 mm (10.1 in) in 1938
The wettest five days of the year at Jefferson, 1897 to 1959. The record is 257.0 mm (10.1 in) in 1938, marked on the chart; the median year is 91.5 mm (3.6 in).
Wettest five days (Rx5day) at Jefferson by year
YearWettest five days (Rx5day)
1897122.2 mm (4.8 in)
1898111.5 mm (4.4 in)
189975.4 mm (3.0 in)
190082.6 mm (3.3 in)
1901n/a
190270.6 mm (2.8 in)
19036.3 mm (0.25 in)
190448.6 mm (1.9 in)
190533.0 mm (1.3 in)
1906n/a
1907109.2 mm (4.3 in)
190860.2 mm (2.4 in)
190992.2 mm (3.6 in)
191065.3 mm (2.6 in)
191191.2 mm (3.6 in)
191266.0 mm (2.6 in)
191398.8 mm (3.9 in)
191497.2 mm (3.8 in)
1915123.5 mm (4.9 in)
191688.9 mm (3.5 in)
191776.0 mm (3.0 in)
191868.3 mm (2.7 in)
191994.5 mm (3.7 in)
1920117.8 mm (4.6 in)
1921138.9 mm (5.5 in)
1922126.8 mm (5.0 in)
1923106.9 mm (4.2 in)
192459.9 mm (2.4 in)
192596.6 mm (3.8 in)
192680.5 mm (3.2 in)
1927166.7 mm (6.6 in)
1928105.6 mm (4.2 in)
192974.0 mm (2.9 in)
193058.4 mm (2.3 in)
1931142.8 mm (5.6 in)
1932146.8 mm (5.8 in)
1933190.8 mm (7.5 in)
1934105.1 mm (4.1 in)
193578.2 mm (3.1 in)
1936158.6 mm (6.2 in)
1937119.9 mm (4.7 in)
1938257.0 mm (10.1 in)
193991.5 mm (3.6 in)
194087.6 mm (3.4 in)
194164.5 mm (2.5 in)
194297.3 mm (3.8 in)
1943111.6 mm (4.4 in)
1944155.4 mm (6.1 in)
194582.2 mm (3.2 in)
194683.8 mm (3.3 in)
1947127.0 mm (5.0 in)
194886.8 mm (3.4 in)
194949.8 mm (2.0 in)
1950101.9 mm (4.0 in)
195178.7 mm (3.1 in)
195274.6 mm (2.9 in)
195392.7 mm (3.6 in)
1954180.1 mm (7.1 in)
195564.0 mm (2.5 in)
195669.1 mm (2.7 in)
195737.1 mm (1.5 in)
195868.6 mm (2.7 in)
1959157.0 mm (6.2 in)

Longest dry spell (CDD)

Longest dry spell (CDD) at Jefferson by year The longest dry spell of the year at Jefferson, 1897 to 1959. The record is 38 days in 1947, marked on the chart; the median year is 16 days. 010203040190019201940Record: 38 days in 1947
The longest dry spell of the year at Jefferson, 1897 to 1959. The record is 38 days in 1947, marked on the chart; the median year is 16 days.
Longest dry spell (CDD) at Jefferson by year
YearLongest dry spell (CDD)
189720 days
189810 days
189912 days
190012 days
19011 day
19023 days
19033 days
19047 days
190510 days
19061 day
19079 days
19085 days
19098 days
191025 days
191117 days
191223 days
191316 days
191425 days
191523 days
191613 days
191715 days
191819 days
191916 days
192022 days
192119 days
192222 days
192316 days
192435 days
192513 days
192613 days
192717 days
192812 days
192913 days
193023 days
193114 days
193218 days
193313 days
193418 days
193513 days
193614 days
193713 days
193813 days
193924 days
194018 days
194120 days
194212 days
194319 days
194415 days
194515 days
194621 days
194738 days
194816 days
194921 days
195016 days
195115 days
195220 days
195322 days
195414 days
195525 days
195616 days
195718 days
195816 days
195914 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, 1898 to 1957

A day with at least 82.9 mm (3.3 in) of rain is expected about once in 2 years. A day with at least 254.6 mm (10.0 in) of rain is expected about once in 100 years.

Rainfall return levels at Jefferson: the daily rain expected about once in a given number of years
Expected about once inA day with at leastNote
2 years82.9 mm (3.3 in)
5 years120.1 mm (4.7 in)
10 years147.9 mm (5.8 in)
25 years187.1 mm (7.4 in)
50 years219.5 mm (8.6 in)Longer than the 33 years of record
100 years254.6 mm (10.0 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 1898 to 1957.

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: 257.0 mm (10.1 in) in 1938; 180.1 mm (7.1 in) in 1933; 154.9 mm (6.1 in) in 1944.

Download the Data

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