Mont-de-Marsan Weather Records (FRE00106203)

Record envelope, standing records and threshold days for Mont-de-Marsan (FRE00106203), France, with 82 years of record.

Key Facts for Mont-de-Marsan

Mont-de-Marsan (FRE00106203) is a weather station in France at 43.91 latitude and 0.50 longitude, 59 m (194 ft) above sea level.
The station reports from 1945 to 2026, 82 years of record.
1,464 records set at Mont-de-Marsan still stand.
Records are tracked for tmax, tmin, prcp: an element needs 30 years of data to be eligible.
Mont-de-Marsan tied a daily record high maximum temperature of 40.8 C (105.4 F) on 13 August 2026.

About the Station

Location: France, 43.91 latitude, 0.50 longitude.
Elevation: 59 m (194 ft).
Period of record: 1945 to 2026, 82 years.
Eligible elements: tmax, tmin, prcp.

Daily Record Envelope and 2026

20 days at or beyond a record

The band shows the record high and record low for each calendar day at Mont-de-Marsan. The lines show the 2026 daily maximum and minimum. 20 days in 2026 matched or passed a record. Temperatures are in degrees Celsius.

Daily record high and record low at Mont-de-Marsan, with 2026 drawn through them
Month	Highest record high	Lowest record low	2026 highest maximum	2026 lowest minimum
Jan	23.4 C (74.1 F)	-19.8 C (-3.6 F)	16.5 C (61.7 F)	-8.9 C (16.0 F)
Feb	26.7 C (80.1 F)	-16.8 C (1.8 F)	25.2 C (77.4 F)	0.5 C (32.9 F)
Mar	30.1 C (86.2 F)	-11.5 C (11.3 F)	24.3 C (75.7 F)	-0.6 C (30.9 F)
Apr	32.1 C (89.8 F)	-5.4 C (22.3 F)	29.7 C (85.5 F)	0.2 C (32.4 F)
May	35.7 C (96.3 F)	-2.5 C (27.5 F)	35.7 C (96.3 F)	3.6 C (38.5 F)
Jun	42.0 C (107.6 F)	1.8 C (35.2 F)	42.0 C (107.6 F)	6.7 C (44.1 F)
Jul	41.2 C (106.2 F)	2.0 C (35.6 F)	40.6 C (105.1 F)	12.6 C (54.7 F)
Aug	42.5 C (108.5 F)	4.1 C (39.4 F)	40.8 C (105.4 F)	11.6 C (52.9 F)
Sep	39.2 C (102.6 F)	-0.5 C (31.1 F)	n/a	n/a
Oct	33.8 C (92.8 F)	-6.2 C (20.8 F)	n/a	n/a
Nov	26.7 C (80.1 F)	-10.4 C (13.3 F)	n/a	n/a
Dec	23.9 C (75.0 F)	-14.5 C (5.9 F)	n/a	n/a

Which Years Hold Standing Records

1,464 standing records

1,464 records at Mont-de-Marsan still stand. 2022 holds the most, with 46.

Standing records at Mont-de-Marsan by the year they were set
Year set	Standing records
1945	31
1946	24
1947	29
1948	22
1949	34
1950	10
1951	11
1952	22
1953	13
1954	24
1955	28
1956	32
1957	13
1958	14
1959	10
1960	15
1961	13
1962	26
1963	26
1964	11
1965	17
1966	14
1967	13
1968	8
1969	11
1970	15
1971	17
1972	16
1973	10
1974	17
1975	13
1976	16
1977	22
1978	18
1979	13
1980	17
1981	20
1982	9
1983	19
1984	7
1985	31
1986	10
1987	22
1988	13
1989	19
1990	23
1991	12
1992	13
1993	16
1994	12
1995	12
1996	12
1997	14
1998	16
1999	9
2000	10
2001	24
2002	11
2003	26
2004	18
2005	25
2006	18
2007	20
2008	12
2009	13
2010	19
2011	16
2012	21
2013	18
2014	17
2015	16
2016	10
2017	13
2018	19
2019	15
2020	20
2021	16
2022	46
2023	31
2024	18
2025	18
2026	40

All-Time Record Progression

9 new records

9 all-time records were set at Mont-de-Marsan between 31 July 1983 and 14 August 2003. Each dot is a new record.

When Mont-de-Marsan set new all-time records
Date	Kind	Detail
1983-07-31	Record high minimum temperature	Record high minimum temperature 21.8 C (71.2 F)
1985-01-08	Record low minimum temperature	Record low minimum temperature -19.8 C (-3.6 F)
1987-01-18	Record low maximum temperature	Record low maximum temperature -6.2 C (20.8 F)
1990-07-26	Record high minimum temperature	Record high minimum temperature 22.1 C (71.8 F)
1990-08-05	Record high minimum temperature	Record high minimum temperature 22.4 C (72.3 F)
2003-08-06	Record high minimum temperature	Record high minimum temperature 22.5 C (72.5 F)
2003-08-10	Record high minimum temperature	Record high minimum temperature 23.4 C (74.1 F)
2003-08-11	Record high minimum temperature	Record high minimum temperature 23.5 C (74.3 F)
2003-08-14	Record high minimum temperature	Record high minimum temperature 23.8 C (74.8 F)

Wettest Day of Each Month

Oct: 68.9 mm (2.7 in)

The wettest day on record for each calendar month at Mont-de-Marsan. The most was 68.9 mm (2.7 in) on 6 October 1959.

Record daily precipitation for each month at Mont-de-Marsan
Month	Record daily precipitation (mm)	Date
Jan	48.7 mm (1.9 in)	31 January 2019
Feb	46.9 mm (1.8 in)	12 February 1990
Mar	43.1 mm (1.7 in)	16 March 1988
Apr	34.6 mm (1.4 in)	21 April 1969
May	68.8 mm (2.7 in)	10 May 2020
Jun	67.9 mm (2.7 in)	8 June 2013
Jul	60.9 mm (2.4 in)	1 July 2018
Aug	51.5 mm (2.0 in)	5 August 1963
Sep	62.8 mm (2.5 in)	14 September 1969
Oct	68.9 mm (2.7 in)	6 October 1959
Nov	56.1 mm (2.2 in)	23 November 1949
Dec	60.1 mm (2.4 in)	13 December 1981

Period of Record Coverage

1945 to 2026

82 years of record at Mont-de-Marsan, 1945 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 Mont-de-Marsan
Year	Days with data	Share of year	Complete
1945	364	100%	Yes
1946	364	100%	Yes
1947	363	99%	Yes
1948	366	100%	Yes
1949	365	100%	Yes
1950	363	99%	Yes
1951	364	100%	Yes
1952	365	100%	Yes
1953	365	100%	Yes
1954	363	99%	Yes
1955	365	100%	Yes
1956	364	99%	Yes
1957	363	99%	Yes
1958	365	100%	Yes
1959	364	100%	Yes
1960	366	100%	Yes
1961	364	100%	Yes
1962	360	99%	Yes
1963	363	99%	Yes
1964	365	100%	Yes
1965	364	100%	Yes
1966	364	100%	Yes
1967	362	99%	Yes
1968	363	99%	Yes
1969	363	99%	Yes
1970	364	100%	Yes
1971	363	99%	Yes
1972	366	100%	Yes
1973	362	99%	Yes
1974	363	99%	Yes
1975	363	99%	Yes
1976	366	100%	Yes
1977	365	100%	Yes
1978	364	100%	Yes
1979	362	99%	Yes
1980	366	100%	Yes
1981	364	100%	Yes
1982	365	100%	Yes
1983	365	100%	Yes
1984	366	100%	Yes
1985	362	99%	Yes
1986	362	99%	Yes
1987	360	99%	Yes
1988	365	100%	Yes
1989	364	100%	Yes
1990	362	99%	Yes
1991	364	100%	Yes
1992	363	99%	Yes
1993	365	100%	Yes
1994	361	99%	Yes
1995	361	99%	Yes
1996	362	99%	Yes
1997	365	100%	Yes
1998	363	99%	Yes
1999	362	99%	Yes
2000	365	100%	Yes
2001	361	99%	Yes
2002	363	99%	Yes
2003	362	99%	Yes
2004	364	99%	Yes
2005	365	100%	Yes
2006	365	100%	Yes
2007	365	100%	Yes
2008	365	100%	Yes
2009	363	99%	Yes
2010	365	100%	Yes
2011	364	100%	Yes
2012	364	99%	Yes
2013	363	99%	Yes
2014	363	99%	Yes
2015	363	99%	Yes
2016	364	99%	Yes
2017	362	99%	Yes
2018	365	100%	Yes
2019	365	100%	Yes
2020	366	100%	Yes
2021	365	100%	Yes
2022	364	100%	Yes
2023	363	99%	Yes
2024	365	100%	Yes
2025	363	99%	Yes
2026	243	67%	No

Latest Records

Latest records at Mont-de-Marsan
Date	Station	Record	Value	Beat old record by	Old record stood	Significance
13 August 2026	Mont-de-Marsan, FR	daily high max (Tie)	40.8 C (105.4 F)	tie	23 years	3 of 100 (Routine)
29 July 2026	Mont-de-Marsan, FR	daily high max	40.6 C (105.1 F)	3.2 C (5.8 F)	1 year	15 of 100 (Routine)
16 July 2026	Mont-de-Marsan, FR	daily high min	21.8 C (71.2 F)	1.4 C (2.5 F)	20 years	18 of 100 (Routine)
15 July 2026	Mont-de-Marsan, FR	monthly high min	23.2 C (73.8 F)	0.1 C (0.2 F)	0 years	18 of 100 (Routine)
14 July 2026	Mont-de-Marsan, FR	daily high min	20.2 C (68.4 F)	0.4 C (0.7 F)	20 years	15 of 100 (Routine)
13 July 2026	Mont-de-Marsan, FR	monthly high min	23.1 C (73.6 F)	0.7 C (1.3 F)	3 years	21 of 100 (Routine)
12 July 2026	Mont-de-Marsan, FR	daily high max	39.3 C (102.7 F)	0.3 C (0.5 F)	76 years	31 of 100 (Routine)
12 July 2026	Mont-de-Marsan, FR	daily high min	22.2 C (72.0 F)	2.0 C (3.6 F)	0 years	13 of 100 (Routine)
10 July 2026	Mont-de-Marsan, FR	daily high min	20.9 C (69.6 F)	0.9 C (1.6 F)	31 years	19 of 100 (Routine)
9 July 2026	Mont-de-Marsan, FR	daily high max	38.9 C (102.0 F)	2.9 C (5.2 F)	67 years	34 of 100 (Routine)
7 July 2026	Mont-de-Marsan, FR	daily high max	39.4 C (102.9 F)	2.6 C (4.7 F)	44 years	26 of 100 (Routine)
6 July 2026	Mont-de-Marsan, FR	daily high max	38.3 C (100.9 F)	1.6 C (2.9 F)	44 years	24 of 100 (Routine)
5 July 2026	Mont-de-Marsan, FR	daily high max	36.2 C (97.2 F)	1.5 C (2.7 F)	7 years	13 of 100 (Routine)
28 June 2026	Mont-de-Marsan, FR	daily rain	27.0 mm (1.1 in)	7.2 mm (0.28 in)	48 years	32 of 100 (Routine)
27 June 2026	Mont-de-Marsan, FR	daily high min	22.0 C (71.6 F)	1.4 C (2.5 F)	1 year	12 of 100 (Routine)
26 June 2026	Mont-de-Marsan, FR	daily high min	21.6 C (70.9 F)	1.3 C (2.3 F)	20 years	17 of 100 (Routine)
25 June 2026	Mont-de-Marsan, FR	monthly high min	22.5 C (72.5 F)	1.1 C (2.0 F)	20 years	27 of 100 (Routine)
25 June 2026	Mont-de-Marsan, FR	daily high max	40.5 C (104.9 F)	2.7 C (4.9 F)	24 years	20 of 100 (Routine)
24 June 2026	Mont-de-Marsan, FR	daily high max	41.4 C (106.5 F)	5.3 C (9.5 F)	79 years	42 of 100 (Notable)
23 June 2026	Mont-de-Marsan, FR	monthly high max	42.0 C (107.6 F)	0.1 C (0.2 F)	0 years	18 of 100 (Routine)

Climate Trend

81 complete years, 1945 to 2025

One stripe for each of 81 complete years at Mont-de-Marsan, 1945 to 2025. Blue stripes are years cooler than the station's own mean of 13.4 C (56.0 F); red stripes are warmer. The coolest year was 1956, at 11.5 C (52.7 F), and the warmest was 2022, at 15.6 C (60.1 F). The strongest colour marks a difference of 2.3 C (4.1 F).

Annual mean temperature at Mont-de-Marsan as warming stripes, 1945 to 2025
Year	Annual mean temperature	Difference from the station mean
1945	13.6 C	+0.21 C
1946	12.3 C	-1.04 C
1947	13.8 C	+0.40 C
1948	13.2 C	-0.20 C
1949	13.7 C	+0.30 C
1950	13.4 C	+0.00 C
1951	12.6 C	-0.74 C
1952	12.9 C	-0.42 C
1953	12.4 C	-0.93 C
1954	12.1 C	-1.29 C
1955	13.0 C	-0.35 C
1956	11.5 C	-1.85 C
1957	12.6 C	-0.72 C
1958	13.0 C	-0.33 C
1959	13.4 C	+0.05 C
1960	12.8 C	-0.53 C
1961	13.7 C	+0.38 C
1962	12.4 C	-0.99 C
1963	11.9 C	-1.48 C
1964	12.9 C	-0.47 C
1965	12.5 C	-0.84 C
1966	13.2 C	-0.16 C
1967	12.8 C	-0.53 C
1968	13.0 C	-0.33 C
1969	12.6 C	-0.74 C
1970	12.9 C	-0.47 C
1971	12.7 C	-0.69 C
1972	12.1 C	-1.27 C
1973	12.4 C	-0.94 C
1974	12.5 C	-0.89 C
1975	12.4 C	-1.00 C
1976	12.8 C	-0.53 C
1977	12.6 C	-0.78 C
1978	12.3 C	-1.10 C
1979	12.7 C	-0.69 C
1980	12.3 C	-1.06 C
1981	13.5 C	+0.09 C
1982	13.8 C	+0.44 C
1983	13.4 C	+0.08 C
1984	12.7 C	-0.68 C
1985	12.7 C	-0.71 C
1986	13.1 C	-0.29 C
1987	12.8 C	-0.53 C
1988	13.3 C	-0.03 C
1989	14.1 C	+0.69 C
1990	14.1 C	+0.70 C
1991	13.0 C	-0.33 C
1992	13.2 C	-0.18 C
1993	12.9 C	-0.48 C
1994	14.2 C	+0.88 C
1995	13.8 C	+0.47 C
1996	13.1 C	-0.25 C
1997	14.4 C	+1.03 C
1998	13.4 C	+0.02 C
1999	13.7 C	+0.35 C
2000	13.9 C	+0.50 C
2001	13.5 C	+0.16 C
2002	14.1 C	+0.71 C
2003	14.6 C	+1.21 C
2004	13.5 C	+0.15 C
2005	13.3 C	-0.04 C
2006	14.3 C	+0.91 C
2007	13.4 C	+0.00 C
2008	13.3 C	-0.06 C
2009	14.1 C	+0.70 C
2010	12.8 C	-0.57 C
2011	14.5 C	+1.17 C
2012	13.7 C	+0.36 C
2013	13.6 C	+0.21 C
2014	14.6 C	+1.23 C
2015	14.3 C	+0.93 C
2016	14.2 C	+0.85 C
2017	14.0 C	+0.68 C
2018	14.6 C	+1.20 C
2019	14.4 C	+1.01 C
2020	14.9 C	+1.51 C
2021	13.9 C	+0.55 C
2022	15.6 C	+2.26 C
2023	15.3 C	+1.92 C
2024	14.7 C	+1.32 C
2025	15.0 C	+1.68 C

The annual mean temperature here has risen by 0.2 C (0.2 to 0.3) per decade over 1945 to 2025. In Fahrenheit: 0.4 F (0.3 to 0.5) per decade. The slope is a straight line fitted to 81 complete years; the brackets give its 95 percent interval.

Fitted temperature trends per decade at Mont-de-Marsan
Measure	Per decade (C)	Per decade (F)	Period	Complete years	Reading
Annual mean temperature	0.2 C (0.2 to 0.3) per decade	0.4 F (0.3 to 0.5) per decade	1945 to 2025	81	Rise
Mean daily maximum	0.3 C (0.2 to 0.3) per decade	0.5 F (0.3 to 0.6) per decade	1945 to 2025	81	Rise
Mean daily minimum	0.2 C (0.2 to 0.3) per decade	0.4 F (0.3 to 0.5) per decade	1945 to 2025	81	Rise

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

1945 to 2026

Yearly extremes at Mont-de-Marsan: the record and the median year
Measure	Record	Year of the record	Median year	Years with a value
Hottest day (TXx)	42.5 C (108.5 F)	1947	36.8 C (98.2 F)	82
Coldest night (TNn)	-19.8 C (-3.6 F)	1985	-8.6 C (16.4 F)	82
Wettest day (Rx1day)	68.9 mm (2.7 in)	1959	40.3 mm (1.6 in)	82
Wettest five days (Rx5day)	169.6 mm (6.7 in)	1990	84.2 mm (3.3 in)	82
Longest dry spell (CDD)	82 days	1945	22 days	82

Hottest day (TXx)

The hottest day of the year at Mont-de-Marsan, 1945 to 2026. The record is 42.5 C (108.5 F) in 1947, marked on the chart; the median year is 36.8 C (98.2 F).

Hottest day (TXx) at Mont-de-Marsan by year
Year	Hottest day (TXx)
1945	39.0 C (102.2 F)
1946	36.8 C (98.2 F)
1947	42.5 C (108.5 F)
1948	33.2 C (91.8 F)
1949	39.0 C (102.2 F)
1950	40.2 C (104.4 F)
1951	35.4 C (95.7 F)
1952	38.5 C (101.3 F)
1953	36.9 C (98.4 F)
1954	35.0 C (95.0 F)
1955	35.2 C (95.4 F)
1956	36.1 C (97.0 F)
1957	35.8 C (96.4 F)
1958	35.6 C (96.1 F)
1959	36.0 C (96.8 F)
1960	33.8 C (92.8 F)
1961	36.8 C (98.2 F)
1962	37.6 C (99.7 F)
1963	35.4 C (95.7 F)
1964	37.6 C (99.7 F)
1965	34.8 C (94.6 F)
1966	36.6 C (97.9 F)
1967	35.2 C (95.4 F)
1968	38.1 C (100.6 F)
1969	35.3 C (95.5 F)
1970	35.2 C (95.4 F)
1971	34.8 C (94.6 F)
1972	33.8 C (92.8 F)
1973	35.2 C (95.4 F)
1974	36.9 C (98.4 F)
1975	37.9 C (100.2 F)
1976	37.7 C (99.9 F)
1977	29.8 C (85.6 F)
1978	35.2 C (95.4 F)
1979	34.1 C (93.4 F)
1980	35.2 C (95.4 F)
1981	36.7 C (98.1 F)
1982	40.4 C (104.7 F)
1983	35.9 C (96.6 F)
1984	37.0 C (98.6 F)
1985	38.0 C (100.4 F)
1986	35.9 C (96.6 F)
1987	36.3 C (97.3 F)
1988	35.3 C (95.5 F)
1989	39.2 C (102.6 F)
1990	38.2 C (100.8 F)
1991	38.1 C (100.6 F)
1992	34.9 C (94.8 F)
1993	35.2 C (95.4 F)
1994	37.5 C (99.5 F)
1995	36.8 C (98.2 F)
1996	35.7 C (96.3 F)
1997	32.6 C (90.7 F)
1998	37.4 C (99.3 F)
1999	36.5 C (97.7 F)
2000	36.2 C (97.2 F)
2001	37.8 C (100.0 F)
2002	36.3 C (97.3 F)
2003	41.4 C (106.5 F)
2004	39.5 C (103.1 F)
2005	36.6 C (97.9 F)
2006	38.1 C (100.6 F)
2007	36.3 C (97.3 F)
2008	36.2 C (97.2 F)
2009	38.5 C (101.3 F)
2010	40.3 C (104.5 F)
2011	39.4 C (102.9 F)
2012	39.9 C (103.8 F)
2013	37.9 C (100.2 F)
2014	35.9 C (96.6 F)
2015	38.3 C (100.9 F)
2016	40.3 C (104.5 F)
2017	37.1 C (98.8 F)
2018	37.0 C (98.6 F)
2019	38.4 C (101.1 F)
2020	40.5 C (104.9 F)
2021	34.5 C (94.1 F)
2022	41.0 C (105.8 F)
2023	41.8 C (107.2 F)
2024	38.9 C (102.0 F)
2025	41.5 C (106.7 F)
2026	42.0 C (107.6 F)

Coldest night (TNn)

The coldest night of the year at Mont-de-Marsan, 1945 to 2026. The record is -19.8 C (-3.6 F) in 1985, marked on the chart; the median year is -8.6 C (16.4 F).

Coldest night (TNn) at Mont-de-Marsan by year
Year	Coldest night (TNn)
1945	-13.5 C (7.7 F)
1946	-14.5 C (5.9 F)
1947	-13.3 C (8.1 F)
1948	-14.9 C (5.2 F)
1949	-11.4 C (11.5 F)
1950	-9.8 C (14.4 F)
1951	-5.4 C (22.3 F)
1952	-9.0 C (15.8 F)
1953	-10.4 C (13.3 F)
1954	-13.8 C (7.2 F)
1955	-9.0 C (15.8 F)
1956	-16.8 C (1.8 F)
1957	-10.9 C (12.4 F)
1958	-4.0 C (24.8 F)
1959	-7.4 C (18.7 F)
1960	-10.1 C (13.8 F)
1961	-11.2 C (11.8 F)
1962	-12.8 C (9.0 F)
1963	-16.7 C (1.9 F)
1964	-8.4 C (16.9 F)
1965	-8.8 C (16.2 F)
1966	-12.6 C (9.3 F)
1967	-10.2 C (13.6 F)
1968	-7.9 C (17.8 F)
1969	-10.0 C (14.0 F)
1970	-8.5 C (16.7 F)
1971	-12.4 C (9.7 F)
1972	-6.0 C (21.2 F)
1973	-9.3 C (15.3 F)
1974	-4.8 C (23.4 F)
1975	-6.5 C (20.3 F)
1976	-8.2 C (17.2 F)
1977	-6.4 C (20.5 F)
1978	-10.4 C (13.3 F)
1979	-7.3 C (18.9 F)
1980	-9.2 C (15.4 F)
1981	-6.6 C (20.1 F)
1982	-3.9 C (25.0 F)
1983	-7.7 C (18.1 F)
1984	-7.3 C (18.9 F)
1985	-19.8 C (-3.6 F)
1986	-11.0 C (12.2 F)
1987	-14.0 C (6.8 F)
1988	-10.4 C (13.3 F)
1989	-5.8 C (21.6 F)
1990	-7.6 C (18.3 F)
1991	-7.7 C (18.1 F)
1992	-6.5 C (20.3 F)
1993	-11.1 C (12.0 F)
1994	-8.2 C (17.2 F)
1995	-7.4 C (18.7 F)
1996	-9.2 C (15.4 F)
1997	-5.6 C (21.9 F)
1998	-10.2 C (13.6 F)
1999	-7.7 C (18.1 F)
2000	-7.4 C (18.7 F)
2001	-13.7 C (7.3 F)
2002	-4.5 C (23.9 F)
2003	-11.0 C (12.2 F)
2004	-6.9 C (19.6 F)
2005	-11.5 C (11.3 F)
2006	-7.1 C (19.2 F)
2007	-10.2 C (13.6 F)
2008	-5.5 C (22.1 F)
2009	-9.3 C (15.3 F)
2010	-9.0 C (15.8 F)
2011	-9.2 C (15.4 F)
2012	-11.5 C (11.3 F)
2013	-6.7 C (19.9 F)
2014	-6.2 C (20.8 F)
2015	-7.0 C (19.4 F)
2016	-5.8 C (21.6 F)
2017	-9.7 C (14.5 F)
2018	-8.5 C (16.7 F)
2019	-6.8 C (19.8 F)
2020	-4.5 C (23.9 F)
2021	-6.3 C (20.7 F)
2022	-6.2 C (20.8 F)
2023	-6.6 C (20.1 F)
2024	-7.7 C (18.1 F)
2025	-6.8 C (19.8 F)
2026	-8.9 C (16.0 F)

Wettest day (Rx1day)

The wettest day of the year at Mont-de-Marsan, 1945 to 2026. The record is 68.9 mm (2.7 in) in 1959, marked on the chart; the median year is 40.3 mm (1.6 in).

Wettest day (Rx1day) at Mont-de-Marsan by year
Year	Wettest day (Rx1day)
1945	49.2 mm (1.9 in)
1946	46.0 mm (1.8 in)
1947	39.5 mm (1.6 in)
1948	35.9 mm (1.4 in)
1949	56.1 mm (2.2 in)
1950	45.0 mm (1.8 in)
1951	42.2 mm (1.7 in)
1952	45.1 mm (1.8 in)
1953	32.0 mm (1.3 in)
1954	38.5 mm (1.5 in)
1955	43.9 mm (1.7 in)
1956	24.4 mm (1.0 in)
1957	41.3 mm (1.6 in)
1958	32.0 mm (1.3 in)
1959	68.9 mm (2.7 in)
1960	41.1 mm (1.6 in)
1961	39.6 mm (1.6 in)
1962	31.2 mm (1.2 in)
1963	51.5 mm (2.0 in)
1964	37.9 mm (1.5 in)
1965	33.9 mm (1.3 in)
1966	24.9 mm (1.0 in)
1967	23.8 mm (0.9 in)
1968	36.1 mm (1.4 in)
1969	62.8 mm (2.5 in)
1970	40.9 mm (1.6 in)
1971	31.4 mm (1.2 in)
1972	29.7 mm (1.2 in)
1973	43.3 mm (1.7 in)
1974	42.7 mm (1.7 in)
1975	57.7 mm (2.3 in)
1976	45.2 mm (1.8 in)
1977	50.0 mm (2.0 in)
1978	42.5 mm (1.7 in)
1979	48.1 mm (1.9 in)
1980	47.9 mm (1.9 in)
1981	60.1 mm (2.4 in)
1982	35.3 mm (1.4 in)
1983	31.0 mm (1.2 in)
1984	30.3 mm (1.2 in)
1985	32.4 mm (1.3 in)
1986	30.3 mm (1.2 in)
1987	46.4 mm (1.8 in)
1988	43.1 mm (1.7 in)
1989	31.1 mm (1.2 in)
1990	68.6 mm (2.7 in)
1991	36.2 mm (1.4 in)
1992	45.9 mm (1.8 in)
1993	39.8 mm (1.6 in)
1994	38.2 mm (1.5 in)
1995	48.6 mm (1.9 in)
1996	27.8 mm (1.1 in)
1997	37.4 mm (1.5 in)
1998	43.8 mm (1.7 in)
1999	68.4 mm (2.7 in)
2000	48.4 mm (1.9 in)
2001	31.8 mm (1.3 in)
2002	31.8 mm (1.3 in)
2003	36.4 mm (1.4 in)
2004	47.0 mm (1.9 in)
2005	37.0 mm (1.5 in)
2006	42.0 mm (1.7 in)
2007	32.4 mm (1.3 in)
2008	25.6 mm (1.0 in)
2009	44.8 mm (1.8 in)
2010	38.3 mm (1.5 in)
2011	37.3 mm (1.5 in)
2012	49.3 mm (1.9 in)
2013	67.9 mm (2.7 in)
2014	47.0 mm (1.9 in)
2015	38.0 mm (1.5 in)
2016	35.2 mm (1.4 in)
2017	37.5 mm (1.5 in)
2018	60.9 mm (2.4 in)
2019	52.7 mm (2.1 in)
2020	68.8 mm (2.7 in)
2021	32.7 mm (1.3 in)
2022	30.0 mm (1.2 in)
2023	48.9 mm (1.9 in)
2024	44.2 mm (1.7 in)
2025	33.4 mm (1.3 in)
2026	32.5 mm (1.3 in)

Wettest five days (Rx5day)

The wettest five days of the year at Mont-de-Marsan, 1945 to 2026. The record is 169.6 mm (6.7 in) in 1990, marked on the chart; the median year is 84.2 mm (3.3 in).

Wettest five days (Rx5day) at Mont-de-Marsan by year
Year	Wettest five days (Rx5day)
1945	77.2 mm (3.0 in)
1946	72.4 mm (2.9 in)
1947	64.4 mm (2.5 in)
1948	95.5 mm (3.8 in)
1949	166.5 mm (6.6 in)
1950	101.6 mm (4.0 in)
1951	77.3 mm (3.0 in)
1952	119.8 mm (4.7 in)
1953	58.0 mm (2.3 in)
1954	64.2 mm (2.5 in)
1955	76.9 mm (3.0 in)
1956	40.3 mm (1.6 in)
1957	49.1 mm (1.9 in)
1958	86.4 mm (3.4 in)
1959	118.0 mm (4.6 in)
1960	90.4 mm (3.6 in)
1961	94.8 mm (3.7 in)
1962	56.0 mm (2.2 in)
1963	107.8 mm (4.2 in)
1964	137.0 mm (5.4 in)
1965	77.5 mm (3.1 in)
1966	69.3 mm (2.7 in)
1967	71.1 mm (2.8 in)
1968	92.8 mm (3.7 in)
1969	94.0 mm (3.7 in)
1970	67.8 mm (2.7 in)
1971	95.2 mm (3.7 in)
1972	95.0 mm (3.7 in)
1973	75.9 mm (3.0 in)
1974	84.4 mm (3.3 in)
1975	111.1 mm (4.4 in)
1976	117.7 mm (4.6 in)
1977	83.8 mm (3.3 in)
1978	69.1 mm (2.7 in)
1979	76.9 mm (3.0 in)
1980	88.9 mm (3.5 in)
1981	145.9 mm (5.7 in)
1982	91.6 mm (3.6 in)
1983	66.9 mm (2.6 in)
1984	84.9 mm (3.3 in)
1985	53.6 mm (2.1 in)
1986	50.2 mm (2.0 in)
1987	89.0 mm (3.5 in)
1988	79.0 mm (3.1 in)
1989	113.4 mm (4.5 in)
1990	169.6 mm (6.7 in)
1991	99.2 mm (3.9 in)
1992	95.1 mm (3.7 in)
1993	92.0 mm (3.6 in)
1994	80.0 mm (3.1 in)
1995	65.0 mm (2.6 in)
1996	52.8 mm (2.1 in)
1997	86.0 mm (3.4 in)
1998	93.2 mm (3.7 in)
1999	86.4 mm (3.4 in)
2000	141.6 mm (5.6 in)
2001	94.0 mm (3.7 in)
2002	54.4 mm (2.1 in)
2003	69.6 mm (2.7 in)
2004	117.0 mm (4.6 in)
2005	73.0 mm (2.9 in)
2006	84.0 mm (3.3 in)
2007	64.2 mm (2.5 in)
2008	69.2 mm (2.7 in)
2009	118.6 mm (4.7 in)
2010	98.9 mm (3.9 in)
2011	63.7 mm (2.5 in)
2012	83.3 mm (3.3 in)
2013	85.1 mm (3.4 in)
2014	110.7 mm (4.4 in)
2015	73.2 mm (2.9 in)
2016	80.9 mm (3.2 in)
2017	73.1 mm (2.9 in)
2018	75.5 mm (3.0 in)
2019	150.2 mm (5.9 in)
2020	140.4 mm (5.5 in)
2021	114.4 mm (4.5 in)
2022	71.9 mm (2.8 in)
2023	104.2 mm (4.1 in)
2024	80.7 mm (3.2 in)
2025	58.3 mm (2.3 in)
2026	67.9 mm (2.7 in)

Longest dry spell (CDD)

The longest dry spell of the year at Mont-de-Marsan, 1945 to 2026. The record is 82 days in 1945, marked on the chart; the median year is 22 days.

Longest dry spell (CDD) at Mont-de-Marsan by year
Year	Longest dry spell (CDD)
1945	82 days
1946	21 days
1947	21 days
1948	30 days
1949	24 days
1950	26 days
1951	15 days
1952	20 days
1953	49 days
1954	16 days
1955	33 days
1956	23 days
1957	17 days
1958	20 days
1959	20 days
1960	23 days
1961	37 days
1962	30 days
1963	23 days
1964	30 days
1965	17 days
1966	21 days
1967	21 days
1968	18 days
1969	17 days
1970	19 days
1971	13 days
1972	20 days
1973	17 days
1974	14 days
1975	13 days
1976	23 days
1977	21 days
1978	38 days
1979	18 days
1980	15 days
1981	18 days
1982	42 days
1983	26 days
1984	15 days
1985	35 days
1986	27 days
1987	23 days
1988	19 days
1989	24 days
1990	14 days
1991	23 days
1992	21 days
1993	26 days
1994	27 days
1995	23 days
1996	19 days
1997	32 days
1998	32 days
1999	14 days
2000	19 days
2001	23 days
2002	18 days
2003	21 days
2004	15 days
2005	15 days
2006	22 days
2007	24 days
2008	21 days
2009	22 days
2010	21 days
2011	25 days
2012	27 days
2013	18 days
2014	20 days
2015	32 days
2016	26 days
2017	22 days
2018	18 days
2019	28 days
2020	45 days
2021	26 days
2022	43 days
2023	32 days
2024	22 days
2025	21 days
2026	18 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.

Frost Dates and Growing Season

81 years with a frost

Across 81 years with a frost, the median last spring frost at Mont-de-Marsan falls on 16 April and the median first autumn frost on 30 October, which leaves a median of 199 days between them.

In 1996 to 2025 the median growing season was 204 days. That is 16 days more than in 1945 to 1974.

Fitted over all years, the growing season changes by +3.9 days per decade at this station.

Frost dates and growing season at Mont-de-Marsan
Measure	Median, all years	Earliest period (1945 to 1974)	Recent period (1996 to 2025)	Recent against earliest	Fitted trend
Last spring frost	16 April	18 April	9 April	9 days earlier	-2.1 days per decade
First autumn frost	30 October	25 October	3 November	9 days later	+1.8 days per decade
Growing days	199 days	188 days	204 days	16 days more	+3.9 days per decade

A frost day is a day with a daily minimum at or below 0 C (32 F). The last spring frost and the first autumn frost are the last and first such days of the cold season, and growing days are the days between them. A negative trend for the last spring frost means it comes earlier.

Rainfall Return Levels

80 years, 1946 to 2025

A day with at least 40.0 mm (1.6 in) of rain is expected about once in 2 years. A day with at least 76.5 mm (3.0 in) of rain is expected about once in 100 years.

Rainfall return levels at Mont-de-Marsan: the daily rain expected about once in a given number of years
Expected about once in	A day with at least	Note
2 years	40.0 mm (1.6 in)
5 years	49.9 mm (2.0 in)
10 years	56.4 mm (2.2 in)
25 years	64.5 mm (2.5 in)
50 years	70.5 mm (2.8 in)
100 years	76.5 mm (3.0 in)	Longer than the 80 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, 80 years of values from 1946 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: 68.9 mm (2.7 in) in 1959; 68.8 mm (2.7 in) in 2020; 68.6 mm (2.7 in) in 1990.

Station Changes

1 suspected

One change was suspected in the annual mean temperature of Mont-de-Marsan, at 1972. Each is measured against neighbouring stations.

Relative to 5 neighbouring stations, the station's annual mean temperature from 1972 ran 0.1 C (0.3 F) lower than in the years before (likely change).

Suspected changes in the annual mean temperature at Mont-de-Marsan, against neighbouring stations
Year	Shift (C)	Shift (F)	Strength	Neighbours
1972	-0.1	-0.3	likely	5

Possible change at the station (a move, a new instrument or a new site); the record is kept as measured. A "likely" change has a larger test statistic than a "possible" one. Neither says why the station differs from its neighbours. How changes are found, and the largest ones.

Climate Twins

2011 to 2025 against 1961 to 1990

Over 2011 to 2025, Mont-de-Marsan had a mean temperature of 14.5 C (58.1 F) and 930.8 mm (36.6 in) of rain a year. The 3 stations whose 1961 to 1990 climate was closest to that are Zadar (Croatia, 1,175 km away), Ourense (Spain, 701 km away) and Saint Helena (United States, 9,209 km away).

Climate twins of Mont-de-Marsan: stations whose 1961 to 1990 climate is closest to its 2011 to 2025 climate
Twin station	Country	Distance away	Mean temperature, 1961-1990	Rain a year, 1961-1990	Climate difference
Zadar	Croatia	1,175 km (730 mi)	14.8 C (58.7 F)	916.3 mm (36.1 in)	0.73
Ourense	Spain	701 km (436 mi)	14.2 C (57.6 F)	811.8 mm (32.0 in)	0.83
Saint Helena	United States	9,209 km (5,722 mi)	14.9 C (58.7 F)	902.1 mm (35.5 in)	0.91

Twins are stations, not cities. A twin is one of the three stations at least 100 km away whose earlier climate is closest to this station's recent one, so a close match does not mean the two places look alike in other ways. A station move or a gap in a record can change that station's averages. The list describes past climate; it is not a forecast and does not say what caused any change. How twins are found, and a search for any station.

Download the Data

Data for Mont-de-Marsan standing records by year: CSV or JSON. Field meanings are on the data page.
Data for Mont-de-Marsan 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 2026-10-13 (13 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).