Jefferson Weather Records (USC00274329)

Record envelope, standing records and threshold days for Jefferson (USC00274329), New Hampshire, United States, with 64 years of record.

Key Facts for Jefferson

Jefferson (USC00274329) is a weather station in New Hampshire, United States at 44.42 latitude and -71.50 longitude, 376 m (1,235 ft) above sea level.
The station reports from 1963 to 2026, 64 years of record.
1,464 records set at Jefferson still stand.
Records are tracked for prcp, snow, snwd: an element needs 30 years of data to be eligible.
Jefferson set a daily record precipitation of 46.2 mm (1.8 in) on 10 July 2026.

About the Station

Location: New Hampshire, United States, 44.42 latitude, -71.50 longitude.
Elevation: 376 m (1,235 ft).
Period of record: 1963 to 2026, 64 years.
Eligible elements: prcp, snow, snwd.

Daily Record Envelope and 2026

29 days at or beyond a record

The band shows the record high and record low for each calendar day at Jefferson. The lines show the 2026 daily maximum and minimum. 29 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
Month	Highest record high	Lowest record low	2026 highest maximum	2026 lowest minimum
Jan	13.3 C (55.9 F)	-30.0 C (-22.0 F)	5.6 C (42.1 F)	-26.7 C (-16.1 F)
Feb	18.3 C (64.9 F)	-30.6 C (-23.1 F)	2.2 C (36.0 F)	-25.6 C (-14.1 F)
Mar	25.6 C (78.1 F)	-23.3 C (-9.9 F)	18.3 C (64.9 F)	-23.3 C (-9.9 F)
Apr	28.9 C (84.0 F)	-13.3 C (8.1 F)	22.2 C (72.0 F)	-10.6 C (12.9 F)
May	33.9 C (93.0 F)	-5.6 C (21.9 F)	28.3 C (82.9 F)	-1.7 C (28.9 F)
Jun	33.3 C (91.9 F)	0.0 C (32.0 F)	31.1 C (88.0 F)	2.2 C (36.0 F)
Jul	34.4 C (93.9 F)	5.0 C (41.0 F)	31.1 C (88.0 F)	8.3 C (46.9 F)
Aug	33.3 C (91.9 F)	5.6 C (42.1 F)	28.9 C (84.0 F)	7.8 C (46.0 F)
Sep	31.1 C (88.0 F)	-2.2 C (28.0 F)	22.2 C (72.0 F)	1.1 C (34.0 F)
Oct	27.8 C (82.0 F)	-8.9 C (16.0 F)	22.8 C (73.0 F)	-1.1 C (30.0 F)
Nov	22.2 C (72.0 F)	-18.9 C (-2.0 F)	n/a	n/a
Dec	16.7 C (62.1 F)	-26.7 C (-16.1 F)	n/a	n/a

Which Years Hold Standing Records

1,464 standing records

1,464 records at Jefferson still stand. 2018 holds the most, with 122.

Wettest Day of Each Month

Apr: 91.9 mm (3.6 in)

The wettest day on record for each calendar month at Jefferson. The most was 91.9 mm (3.6 in) on 29 April 1988.

Record daily precipitation for each month at Jefferson
Month	Record daily precipitation (mm)	Date
Jan	60.5 mm (2.4 in)	27 January 1986
Feb	55.1 mm (2.2 in)	26 February 2010
Mar	55.1 mm (2.2 in)	28 March 1992
Apr	91.9 mm (3.6 in)	29 April 1988
May	45.7 mm (1.8 in)	30 May 1984
Jun	72.9 mm (2.9 in)	12 June 2002
Jul	89.9 mm (3.5 in)	11 July 2024
Aug	63.8 mm (2.5 in)	12 August 1998
Sep	61.7 mm (2.4 in)	17 September 1999
Oct	75.2 mm (3.0 in)	16 October 2005
Nov	40.4 mm (1.6 in)	25 November 1983
Dec	47.0 mm (1.9 in)	18 December 2000

Period of Record Coverage

2011 to 2026

16 years of record at Jefferson, 2011 to 2026. 1 years have data for under 90 percent of days and are left out of rankings: 2026.

Days with data per year at Jefferson
Year	Days with data	Share of year	Complete
2011	365	100%	Yes
2012	366	100%	Yes
2013	365	100%	Yes
2014	365	100%	Yes
2015	365	100%	Yes
2016	366	100%	Yes
2017	365	100%	Yes
2018	365	100%	Yes
2019	365	100%	Yes
2020	366	100%	Yes
2021	365	100%	Yes
2022	365	100%	Yes
2023	365	100%	Yes
2024	366	100%	Yes
2025	365	100%	Yes
2026	275	75%	No

Latest Records

Latest records at Jefferson
Date	Station	Record	Value	Beat old record by	Old record stood	Significance
10 July 2026	Jefferson, US	daily rain	46.2 mm (1.8 in)	24.4 mm (1.0 in)	28 years	39 of 100 (Notable)
19 June 2026	Jefferson, US	daily rain	25.4 mm (1.0 in)	2.5 mm (0.10 in)	36 years	18 of 100 (Routine)
15 June 2026	Jefferson, US	daily rain	40.1 mm (1.6 in)	12.7 mm (0.5 in)	23 years	26 of 100 (Routine)
7 May 2026	Jefferson, US	daily rain	18.3 mm (0.7 in)	3.6 mm (0.14 in)	28 years	18 of 100 (Routine)
20 April 2026	Jefferson, US	daily rain	30.0 mm (1.2 in)	16.8 mm (0.7 in)	28 years	35 of 100 (Notable)
21 February 2026	Jefferson, US	daily snowfall	20.6 cm (8.1 in)	10.4 cm (4.1 in)	59 years	43 of 100 (Notable)
21 February 2026	Jefferson, US	daily rain	14.5 mm (0.6 in)	2.1 mm (0.08 in)	36 years	20 of 100 (Routine)
21 February 2026	Jefferson, US	daily snow depth (Tie)	58.4 cm (23.0 in)	tie	26 years	3 of 100 (Routine)
29 January 2026	Jefferson, US	daily snow depth (Tie)	61.0 cm (24.0 in)	tie	60 years	6 of 100 (Routine)
28 January 2026	Jefferson, US	daily snow depth	61.0 cm (24.0 in)	10.2 cm (4.0 in)	60 years	32 of 100 (Routine)
27 January 2026	Jefferson, US	daily snow depth	58.4 cm (23.0 in)	7.6 cm (3.0 in)	60 years	29 of 100 (Routine)
27 January 2026	Jefferson, US	daily snowfall	17.3 cm (6.8 in)	5.6 cm (2.2 in)	23 years	22 of 100 (Routine)
26 January 2026	Jefferson, US	daily snowfall	27.4 cm (10.8 in)	4.5 cm (1.8 in)	38 years	25 of 100 (Routine)
30 December 2025	Jefferson, US	daily rain	23.4 mm (0.9 in)	2.6 mm (0.10 in)	20 years	16 of 100 (Routine)
24 December 2025	Jefferson, US	daily snowfall	17.0 cm (6.7 in)	3.5 cm (1.4 in)	0 years	12 of 100 (Routine)
3 December 2025	Jefferson, US	daily snowfall	21.1 cm (8.3 in)	9.7 cm (3.8 in)	34 years	34 of 100 (Routine)
3 December 2025	Jefferson, US	daily snow depth	20.3 cm (8.0 in)	2.5 cm (1.0 in)	59 years	25 of 100 (Routine)
8 October 2025	Jefferson, US	daily rain	47.0 mm (1.9 in)	8.9 mm (0.35 in)	43 years	26 of 100 (Routine)
26 September 2025	Jefferson, US	daily rain	26.2 mm (1.0 in)	1.1 mm (0.04 in)	24 years	14 of 100 (Routine)
18 May 2025	Jefferson, US	daily rain	30.7 mm (1.2 in)	12.2 mm (0.5 in)	40 years	33 of 100 (Routine)

Climate Trend

15 complete years, 2011 to 2025

One stripe for each of 15 complete years at Jefferson, 2011 to 2025. Blue stripes are years cooler than the station's own mean of 6.2 C (43.2 F); red stripes are warmer. The coolest year was 2019, at 5.1 C (41.2 F), and the warmest was 2024, at 7.0 C (44.6 F). The strongest colour marks a difference of 1.1 C (2.0 F).

Annual mean temperature at Jefferson as warming stripes, 2011 to 2025
Year	Annual mean temperature	Difference from the station mean
2011	6.4 C	+0.16 C
2012	6.9 C	+0.70 C
2013	5.9 C	-0.36 C
2014	5.5 C	-0.75 C
2015	5.5 C	-0.70 C
2016	6.7 C	+0.52 C
2017	6.6 C	+0.36 C
2018	6.1 C	-0.11 C
2019	5.1 C	-1.10 C
2020	6.8 C	+0.53 C
2021	6.4 C	+0.19 C
2022	6.0 C	-0.23 C
2023	6.8 C	+0.53 C
2024	7.0 C	+0.77 C
2025	5.7 C	-0.55 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

1963 to 2026

Yearly extremes at Jefferson: 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)	2018	32.0 C (89.5 F)	16
Coldest night (TNn)	-30.6 C (-23.1 F)	2023	-26.9 C (-16.5 F)	16
Wettest day (Rx1day)	91.9 mm (3.6 in)	1988	47.5 mm (1.9 in)	53
Wettest five days (Rx5day)	170.7 mm (6.7 in)	2024	80.5 mm (3.2 in)	53
Longest dry spell (CDD)	26 days	2017	14 days	53

Hottest day (TXx)

The hottest day of the year at Jefferson, 1963 to 2026. The record is 34.4 C (93.9 F) in 2018, marked on the chart; the median year is 32.0 C (89.5 F).

Hottest day (TXx) at Jefferson by year
Year	Hottest day (TXx)
1963	n/a
1964	n/a
1965	n/a
1966	n/a
1967	n/a
1979	n/a
1980	n/a
1981	n/a
1982	n/a
1983	n/a
1984	n/a
1985	n/a
1986	n/a
1987	n/a
1988	n/a
1989	n/a
1990	n/a
1991	n/a
1992	n/a
1993	n/a
1994	n/a
1995	n/a
1996	n/a
1997	n/a
1998	n/a
1999	n/a
2000	n/a
2001	n/a
2002	n/a
2003	n/a
2004	n/a
2005	n/a
2006	n/a
2007	n/a
2008	n/a
2009	n/a
2010	n/a
2011	33.3 C (91.9 F)
2012	31.7 C (89.1 F)
2013	31.7 C (89.1 F)
2014	32.2 C (90.0 F)
2015	31.1 C (88.0 F)
2016	31.1 C (88.0 F)
2017	33.3 C (91.9 F)
2018	34.4 C (93.9 F)
2019	31.1 C (88.0 F)
2020	33.9 C (93.0 F)
2021	32.2 C (90.0 F)
2022	31.7 C (89.1 F)
2023	31.1 C (88.0 F)
2024	33.3 C (91.9 F)
2025	33.3 C (91.9 F)
2026	31.1 C (88.0 F)

Coldest night (TNn)

The coldest night of the year at Jefferson, 1963 to 2026. The record is -30.6 C (-23.1 F) in 2023, marked on the chart; the median year is -26.9 C (-16.5 F).

Coldest night (TNn) at Jefferson by year
Year	Coldest night (TNn)
1963	n/a
1964	n/a
1965	n/a
1966	n/a
1967	n/a
1979	n/a
1980	n/a
1981	n/a
1982	n/a
1983	n/a
1984	n/a
1985	n/a
1986	n/a
1987	n/a
1988	n/a
1989	n/a
1990	n/a
1991	n/a
1992	n/a
1993	n/a
1994	n/a
1995	n/a
1996	n/a
1997	n/a
1998	n/a
1999	n/a
2000	n/a
2001	n/a
2002	n/a
2003	n/a
2004	n/a
2005	n/a
2006	n/a
2007	n/a
2008	n/a
2009	n/a
2010	n/a
2011	-30.0 C (-22.0 F)
2012	-23.9 C (-11.0 F)
2013	-26.7 C (-16.1 F)
2014	-28.9 C (-20.0 F)
2015	-28.9 C (-20.0 F)
2016	-27.8 C (-18.0 F)
2017	-26.7 C (-16.1 F)
2018	-29.4 C (-20.9 F)
2019	-22.8 C (-9.0 F)
2020	-27.2 C (-17.0 F)
2021	-25.0 C (-13.0 F)
2022	-29.4 C (-20.9 F)
2023	-30.6 C (-23.1 F)
2024	-23.3 C (-9.9 F)
2025	-26.7 C (-16.1 F)
2026	-26.7 C (-16.1 F)

Wettest day (Rx1day)

The wettest day of the year at Jefferson, 1963 to 2026. The record is 91.9 mm (3.6 in) in 1988, marked on the chart; the median year is 47.5 mm (1.9 in).

Wettest day (Rx1day) at Jefferson by year
Year	Wettest day (Rx1day)
1963	43.2 mm (1.7 in)
1964	52.6 mm (2.1 in)
1965	40.9 mm (1.6 in)
1966	42.9 mm (1.7 in)
1967	26.7 mm (1.1 in)
1979	36.1 mm (1.4 in)
1980	43.2 mm (1.7 in)
1981	52.1 mm (2.1 in)
1982	38.1 mm (1.5 in)
1983	43.7 mm (1.7 in)
1984	45.7 mm (1.8 in)
1985	49.3 mm (1.9 in)
1986	60.5 mm (2.4 in)
1987	50.5 mm (2.0 in)
1988	91.9 mm (3.6 in)
1989	59.7 mm (2.4 in)
1990	45.7 mm (1.8 in)
1991	48.5 mm (1.9 in)
1992	55.1 mm (2.2 in)
1993	46.2 mm (1.8 in)
1994	28.4 mm (1.1 in)
1995	20.8 mm (0.8 in)
1996	30.5 mm (1.2 in)
1997	48.5 mm (1.9 in)
1998	63.8 mm (2.5 in)
1999	61.7 mm (2.4 in)
2000	47.0 mm (1.9 in)
2001	33.8 mm (1.3 in)
2002	72.9 mm (2.9 in)
2003	51.3 mm (2.0 in)
2004	44.5 mm (1.8 in)
2005	75.2 mm (3.0 in)
2006	54.4 mm (2.1 in)
2007	63.0 mm (2.5 in)
2008	58.2 mm (2.3 in)
2009	55.1 mm (2.2 in)
2010	57.9 mm (2.3 in)
2011	47.5 mm (1.9 in)
2012	43.4 mm (1.7 in)
2013	39.4 mm (1.6 in)
2014	37.3 mm (1.5 in)
2015	66.5 mm (2.6 in)
2016	32.0 mm (1.3 in)
2017	46.5 mm (1.8 in)
2018	60.2 mm (2.4 in)
2019	60.7 mm (2.4 in)
2020	48.0 mm (1.9 in)
2021	33.8 mm (1.3 in)
2022	36.8 mm (1.4 in)
2023	52.8 mm (2.1 in)
2024	89.9 mm (3.5 in)
2025	47.0 mm (1.9 in)
2026	46.2 mm (1.8 in)

Wettest five days (Rx5day)

The wettest five days of the year at Jefferson, 1963 to 2026. The record is 170.7 mm (6.7 in) in 2024, marked on the chart; the median year is 80.5 mm (3.2 in).

Wettest five days (Rx5day) at Jefferson by year
Year	Wettest five days (Rx5day)
1963	64.3 mm (2.5 in)
1964	68.1 mm (2.7 in)
1965	61.5 mm (2.4 in)
1966	56.1 mm (2.2 in)
1967	43.5 mm (1.7 in)
1979	43.0 mm (1.7 in)
1980	103.9 mm (4.1 in)
1981	111.3 mm (4.4 in)
1982	53.8 mm (2.1 in)
1983	80.8 mm (3.2 in)
1984	111.1 mm (4.4 in)
1985	51.8 mm (2.0 in)
1986	84.3 mm (3.3 in)
1987	80.5 mm (3.2 in)
1988	99.5 mm (3.9 in)
1989	78.2 mm (3.1 in)
1990	109.2 mm (4.3 in)
1991	57.6 mm (2.3 in)
1992	65.0 mm (2.6 in)
1993	68.4 mm (2.7 in)
1994	55.4 mm (2.2 in)
1995	29.9 mm (1.2 in)
1996	53.8 mm (2.1 in)
1997	77.3 mm (3.0 in)
1998	101.9 mm (4.0 in)
1999	106.1 mm (4.2 in)
2000	84.9 mm (3.3 in)
2001	62.6 mm (2.5 in)
2002	106.9 mm (4.2 in)
2003	68.8 mm (2.7 in)
2004	65.5 mm (2.6 in)
2005	119.4 mm (4.7 in)
2006	84.0 mm (3.3 in)
2007	106.2 mm (4.2 in)
2008	102.1 mm (4.0 in)
2009	61.5 mm (2.4 in)
2010	119.1 mm (4.7 in)
2011	82.5 mm (3.2 in)
2012	89.1 mm (3.5 in)
2013	126.1 mm (5.0 in)
2014	55.6 mm (2.2 in)
2015	102.6 mm (4.0 in)
2016	54.1 mm (2.1 in)
2017	87.1 mm (3.4 in)
2018	95.8 mm (3.8 in)
2019	72.9 mm (2.9 in)
2020	103.9 mm (4.1 in)
2021	86.0 mm (3.4 in)
2022	74.7 mm (2.9 in)
2023	73.6 mm (2.9 in)
2024	170.7 mm (6.7 in)
2025	53.6 mm (2.1 in)
2026	90.6 mm (3.6 in)

Longest dry spell (CDD)

The longest dry spell of the year at Jefferson, 1963 to 2026. The record is 26 days in 2017, marked on the chart; the median year is 14 days.

Longest dry spell (CDD) at Jefferson by year
Year	Longest dry spell (CDD)
1963	14 days
1964	15 days
1965	19 days
1966	15 days
1967	11 days
1979	6 days
1980	22 days
1981	13 days
1982	16 days
1983	16 days
1984	14 days
1985	16 days
1986	20 days
1987	19 days
1988	15 days
1989	14 days
1990	16 days
1991	10 days
1992	11 days
1993	12 days
1994	14 days
1995	7 days
1996	8 days
1997	10 days
1998	12 days
1999	12 days
2000	12 days
2001	17 days
2002	12 days
2003	17 days
2004	14 days
2005	13 days
2006	8 days
2007	16 days
2008	12 days
2009	15 days
2010	14 days
2011	11 days
2012	12 days
2013	19 days
2014	16 days
2015	12 days
2016	11 days
2017	26 days
2018	14 days
2019	9 days
2020	21 days
2021	14 days
2022	11 days
2023	11 days
2024	16 days
2025	17 days
2026	10 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

47 years, 1964 to 2025

A day with at least 49.5 mm (1.9 in) of rain is expected about once in 2 years. A day with at least 92.8 mm (3.7 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 in	A day with at least	Note
2 years	49.5 mm (1.9 in)
5 years	61.2 mm (2.4 in)
10 years	69.0 mm (2.7 in)
25 years	78.6 mm (3.1 in)
50 years	85.7 mm (3.4 in)	Longer than the 47 years of record
100 years	92.8 mm (3.7 in)	Longer than the 47 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, 47 years of values from 1964 to 2025.

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: 91.9 mm (3.6 in) in 1988; 89.9 mm (3.5 in) in 2024; 75.2 mm (3.0 in) in 2005.

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 2026-10-15 (15 October 2026). Records are computed by this site and are not official.

Data as of 2026-10-12. Last revised 12 October 2026 (2026-10-12).