Leland Bowman Lock Weather Records (USC00165296)

Record envelope, standing records and threshold days for Leland Bowman Lock (USC00165296), Louisiana, United States, with 42 years of record.

Key Facts for Leland Bowman Lock

Leland Bowman Lock (USC00165296) is a weather station in Louisiana, United States at 29.79 latitude and -92.21 longitude, 0 m (0 ft) above sea level.
The station reports from 1985 to 2026, 42 years of record.
1,464 records set at Leland Bowman Lock still stand.
Records are tracked for tmax, tmin, prcp, snow, snwd: an element needs 30 years of data to be eligible.
Leland Bowman Lock set a daily record high minimum temperature of 27.2 C (81.0 F) on 1 October 2026 (provisional).

Provisional Records

Records set in the last 60 days are provisional until they clear the revision window.

About the Station

Location: Louisiana, United States, 29.79 latitude, -92.21 longitude.
Elevation: 0 m (0 ft).
Period of record: 1985 to 2026, 42 years.
Eligible elements: tmax, tmin, prcp, snow, snwd.

Daily Record Envelope and 2026

12 days at or beyond a record

The band shows the record high and record low for each calendar day at Leland Bowman Lock. The lines show the 2026 daily maximum and minimum. 12 days in 2026 matched or passed a record. Temperatures are in degrees Celsius.

Daily record high and record low at Leland Bowman Lock, with 2026 drawn through them
Month	Highest record high	Lowest record low	2026 highest maximum	2026 lowest minimum
Jan	26.7 C (80.1 F)	-9.4 C (15.1 F)	25.6 C (78.1 F)	-5.0 C (23.0 F)
Feb	28.3 C (82.9 F)	-7.2 C (19.0 F)	27.8 C (82.0 F)	-3.9 C (25.0 F)
Mar	31.7 C (89.1 F)	-3.9 C (25.0 F)	28.3 C (82.9 F)	2.8 C (37.0 F)
Apr	33.9 C (93.0 F)	1.7 C (35.1 F)	29.4 C (84.9 F)	10.0 C (50.0 F)
May	36.7 C (98.1 F)	8.9 C (48.0 F)	31.7 C (89.1 F)	12.8 C (55.0 F)
Jun	38.9 C (102.0 F)	14.4 C (57.9 F)	33.3 C (91.9 F)	21.7 C (71.1 F)
Jul	39.4 C (102.9 F)	14.4 C (57.9 F)	36.1 C (97.0 F)	21.1 C (70.0 F)
Aug	44.4 C (111.9 F)	14.4 C (57.9 F)	37.2 C (99.0 F)	22.8 C (73.0 F)
Sep	38.9 C (102.0 F)	3.9 C (39.0 F)	35.0 C (95.0 F)	19.4 C (66.9 F)
Oct	35.6 C (96.1 F)	0.6 C (33.1 F)	31.7 C (89.1 F)	18.3 C (64.9 F)
Nov	31.1 C (88.0 F)	-5.0 C (23.0 F)	n/a	n/a
Dec	28.3 C (82.9 F)	-11.7 C (10.9 F)	n/a	n/a

Which Years Hold Standing Records

1,464 standing records

1,464 records at Leland Bowman Lock still stand. 2023 holds the most, with 106.

Standing records at Leland Bowman Lock by the year they were set
Year set	Standing records
1985	25
1986	21
1987	30
1988	35
1989	71
1990	29
1991	34
1992	32
1993	35
1994	47
1995	12
1996	32
1997	29
1998	38
1999	26
2000	43
2001	33
2002	21
2003	26
2004	48
2005	12
2006	40
2007	17
2008	21
2009	19
2010	47
2011	31
2012	28
2013	40
2014	40
2015	61
2016	42
2017	45
2018	44
2019	25
2020	30
2021	31
2022	42
2023	106
2024	22
2025	25
2026	29

All-Time Record Progression

6 new records

6 all-time records were set at Leland Bowman Lock between 5 July 2016 and 21 January 2025. Each dot is a new record.

When Leland Bowman Lock set new all-time records
Date	Kind	Detail
2016-07-05	Record high minimum temperature	Record high minimum temperature 28.3 C (82.9 F)
2016-07-06	Record high minimum temperature	Record high minimum temperature 28.9 C (84.0 F)
2018-10-16	Record daily precipitation	Record daily precipitation 214.9 mm (8.5 in)
2023-08-10	Record high minimum temperature	Record high minimum temperature 29.4 C (84.9 F)
2025-01-21	Record daily snowfall	Record daily snowfall 19.1 cm (7.5 in)
2025-01-21	Record snow depth	Record snow depth 20.3 cm (8.0 in)

Wettest Day of Each Month

Oct: 214.9 mm (8.5 in)

The wettest day on record for each calendar month at Leland Bowman Lock. The most was 214.9 mm (8.5 in) on 16 October 2018.

Record daily precipitation for each month at Leland Bowman Lock
Month	Record daily precipitation (mm)	Date
Jan	157.5 mm (6.2 in)	5 January 1998
Feb	106.7 mm (4.2 in)	19 February 2012
Mar	101.6 mm (4.0 in)	14 March 1995
Apr	168.9 mm (6.6 in)	8 April 2003
May	160.0 mm (6.3 in)	4 May 2017
Jun	127.8 mm (5.0 in)	10 June 2001
Jul	154.7 mm (6.1 in)	14 July 2019
Aug	113.5 mm (4.5 in)	29 August 2017
Sep	139.7 mm (5.5 in)	14 September 2009
Oct	214.9 mm (8.5 in)	16 October 2018
Nov	134.6 mm (5.3 in)	1 November 2015
Dec	158.8 mm (6.3 in)	18 December 1995

Period of Record Coverage

1985 to 2026

42 years of record at Leland Bowman Lock, 1985 to 2026. 5 years have data for under 90 percent of days and are left out of rankings: 1985, 2002, 2022, 2024, 2026.

Days with data per year at Leland Bowman Lock
Year	Days with data	Share of year	Complete
1985	214	59%	No
1986	365	100%	Yes
1987	362	99%	Yes
1988	365	100%	Yes
1989	365	100%	Yes
1990	364	100%	Yes
1991	362	99%	Yes
1992	360	98%	Yes
1993	361	99%	Yes
1994	363	99%	Yes
1995	334	92%	Yes
1996	359	98%	Yes
1997	363	99%	Yes
1998	361	99%	Yes
1999	353	97%	Yes
2000	366	100%	Yes
2001	357	98%	Yes
2002	203	56%	No
2003	341	93%	Yes
2004	356	97%	Yes
2005	345	95%	Yes
2006	365	100%	Yes
2007	364	100%	Yes
2008	336	92%	Yes
2009	364	100%	Yes
2010	364	100%	Yes
2011	365	100%	Yes
2012	363	99%	Yes
2013	353	97%	Yes
2014	353	97%	Yes
2015	361	99%	Yes
2016	359	98%	Yes
2017	364	100%	Yes
2018	365	100%	Yes
2019	364	100%	Yes
2020	343	94%	Yes
2021	350	96%	Yes
2022	297	81%	No
2023	357	98%	Yes
2024	280	77%	No
2025	357	98%	Yes
2026	277	76%	No

Latest Records

Latest records at Leland Bowman Lock
Date	Station	Record	Value	Beat old record by	Old record stood	Significance
1 October 2026	Leland Bowman Lock, US	daily high min (Provisional)	27.2 C (81.0 F)	2.2 C (4.0 F)	20 years	14 of 100 (Routine)
30 September 2026	Leland Bowman Lock, US	daily high min (Provisional)	27.2 C (81.0 F)	3.3 C (5.9 F)	12 years	17 of 100 (Routine)
26 September 2026	Leland Bowman Lock, US	daily high min (Tie, Provisional)	25.0 C (77.0 F)	tie	8 years	1 of 100 (Routine)
16 September 2026	Leland Bowman Lock, US	daily high min (Provisional)	25.6 C (78.1 F)	1.2 C (2.2 F)	28 years	15 of 100 (Routine)
15 September 2026	Leland Bowman Lock, US	daily high min (Provisional)	25.6 C (78.1 F)	1.2 C (2.2 F)	35 years	17 of 100 (Routine)
11 September 2026	Leland Bowman Lock, US	daily high min (Provisional)	24.4 C (75.9 F)	0.5 C (0.9 F)	36 years	16 of 100 (Routine)
9 September 2026	Leland Bowman Lock, US	daily high min (Tie, Provisional)	25.6 C (78.1 F)	tie	9 years	1 of 100 (Routine)
7 September 2026	Leland Bowman Lock, US	daily high min (Tie, Provisional)	25.6 C (78.1 F)	tie	24 years	2 of 100 (Routine)
26 August 2026	Leland Bowman Lock, US	daily high min (Provisional)	26.7 C (80.1 F)	1.1 C (2.0 F)	36 years	19 of 100 (Routine)
24 August 2026	Leland Bowman Lock, US	daily high min (Tie, Provisional)	26.7 C (80.1 F)	tie	9 years	1 of 100 (Routine)
23 August 2026	Leland Bowman Lock, US	daily high min (Tie, Provisional)	26.7 C (80.1 F)	tie	3 years	1 of 100 (Routine)
19 August 2026	Leland Bowman Lock, US	daily high min (Tie, Provisional)	26.7 C (80.1 F)	tie	37 years	3 of 100 (Routine)
18 August 2026	Leland Bowman Lock, US	daily high min (Tie, Provisional)	26.1 C (79.0 F)	tie	15 years	2 of 100 (Routine)
5 August 2026	Leland Bowman Lock, US	daily rain	31.8 mm (1.3 in)	5.1 mm (0.20 in)	17 years	12 of 100 (Routine)
25 July 2026	Leland Bowman Lock, US	daily high min	27.2 C (81.0 F)	0.5 C (0.9 F)	16 years	10 of 100 (Routine)
22 July 2026	Leland Bowman Lock, US	daily high min	27.8 C (82.0 F)	1.1 C (2.0 F)	16 years	14 of 100 (Routine)
16 July 2026	Leland Bowman Lock, US	daily high min (Tie)	26.7 C (80.1 F)	tie	20 years	2 of 100 (Routine)
13 July 2026	Leland Bowman Lock, US	daily low max	27.2 C (81.0 F)	3.4 C (6.1 F)	37 years	30 of 100 (Routine)
10 June 2026	Leland Bowman Lock, US	daily high min (Tie)	26.1 C (79.0 F)	tie	16 years	2 of 100 (Routine)
9 June 2026	Leland Bowman Lock, US	daily high min (Tie)	26.1 C (79.0 F)	tie	40 years	4 of 100 (Routine)

Climate Trend

34 complete years, 1986 to 2025

One stripe for each of 34 complete years at Leland Bowman Lock, 1986 to 2025. Blue stripes are years cooler than the station's own mean of 20.4 C (68.6 F); red stripes are warmer. The coolest year was 2021, at 18.7 C (65.7 F), and the warmest was 2023, at 22.6 C (72.6 F). The strongest colour marks a difference of 2.3 C (4.1 F).

Annual mean temperature at Leland Bowman Lock as warming stripes, 1986 to 2025
Year	Annual mean temperature	Difference from the station mean
1986	20.5 C	+0.16 C
1987	19.6 C	-0.76 C
1988	19.5 C	-0.82 C
1989	19.4 C	-0.96 C
1990	20.6 C	+0.29 C
1991	20.1 C	-0.21 C
1992	19.6 C	-0.80 C
1993	19.4 C	-0.99 C
1994	19.7 C	-0.70 C
1996	19.9 C	-0.42 C
1997	20.0 C	-0.32 C
1998	21.2 C	+0.82 C
1999	20.8 C	+0.44 C
2000	20.4 C	0.00 C
2001	20.3 C	-0.03 C
2004	19.6 C	-0.73 C
2005	20.2 C	-0.14 C
2006	21.3 C	+0.98 C
2007	20.2 C	-0.16 C
2009	20.5 C	+0.17 C
2010	19.9 C	-0.50 C
2011	20.4 C	+0.02 C
2012	21.1 C	+0.79 C
2013	20.0 C	-0.33 C
2014	19.7 C	-0.62 C
2015	21.6 C	+1.28 C
2016	21.9 C	+1.59 C
2017	21.3 C	+0.96 C
2018	20.5 C	+0.15 C
2019	20.0 C	-0.36 C
2020	20.0 C	-0.32 C
2021	18.7 C	-1.64 C
2023	22.6 C	+2.23 C
2025	21.4 C	+1.00 C

The annual mean temperature here has risen by 0.3 C (0.1 to 0.5) per decade over 1986 to 2025. In Fahrenheit: 0.5 F (0.1 to 0.9) per decade. The slope is a straight line fitted to 34 complete years; the brackets give its 95 percent interval.

Fitted temperature trends per decade at Leland Bowman Lock
Measure	Per decade (C)	Per decade (F)	Period	Complete years	Reading
Annual mean temperature	0.3 C (0.1 to 0.5) per decade	0.5 F (0.1 to 0.9) per decade	1986 to 2025	34	Rise
Mean daily maximum	0.4 C (0.1 to 0.6) per decade	0.6 F (0.2 to 1.1) per decade	1986 to 2025	34	Rise
Mean daily minimum	0.22 C (-0.02 to 0.45) per decade	0.39 F (-0.04 to 0.82) per decade	1986 to 2025	34	Not clearly different from zero

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

1985 to 2026

Yearly extremes at Leland Bowman Lock: the record and the median year
Measure	Record	Year of the record	Median year	Years with a value
Hottest day (TXx)	44.4 C (111.9 F)	2011	37.0 C (98.5 F)	42
Coldest night (TNn)	-11.7 C (10.9 F)	1989	-3.9 C (25.0 F)	42
Wettest day (Rx1day)	214.9 mm (8.5 in)	2018	122.6 mm (4.8 in)	42
Wettest five days (Rx5day)	362.4 mm (14.3 in)	2001	198.2 mm (7.8 in)	42
Longest dry spell (CDD)	63 days	2008	23 days	42

Hottest day (TXx)

The hottest day of the year at Leland Bowman Lock, 1985 to 2026. The record is 44.4 C (111.9 F) in 2011, marked on the chart; the median year is 37.0 C (98.5 F).

Hottest day (TXx) at Leland Bowman Lock by year
Year	Hottest day (TXx)
1985	36.7 C (98.1 F)
1986	36.7 C (98.1 F)
1987	35.0 C (95.0 F)
1988	35.0 C (95.0 F)
1989	35.6 C (96.1 F)
1990	36.7 C (98.1 F)
1991	35.0 C (95.0 F)
1992	35.6 C (96.1 F)
1993	35.6 C (96.1 F)
1994	33.9 C (93.0 F)
1995	37.2 C (99.0 F)
1996	35.0 C (95.0 F)
1997	36.1 C (97.0 F)
1998	37.8 C (100.0 F)
1999	37.2 C (99.0 F)
2000	39.4 C (102.9 F)
2001	34.4 C (93.9 F)
2002	35.0 C (95.0 F)
2003	35.0 C (95.0 F)
2004	35.6 C (96.1 F)
2005	35.6 C (96.1 F)
2006	38.3 C (100.9 F)
2007	37.2 C (99.0 F)
2008	35.0 C (95.0 F)
2009	38.3 C (100.9 F)
2010	37.8 C (100.0 F)
2011	44.4 C (111.9 F)
2012	37.2 C (99.0 F)
2013	37.2 C (99.0 F)
2014	36.7 C (98.1 F)
2015	39.4 C (102.9 F)
2016	38.3 C (100.9 F)
2017	37.2 C (99.0 F)
2018	37.2 C (99.0 F)
2019	37.8 C (100.0 F)
2020	37.2 C (99.0 F)
2021	35.6 C (96.1 F)
2022	38.9 C (102.0 F)
2023	41.7 C (107.1 F)
2024	37.8 C (100.0 F)
2025	35.6 C (96.1 F)
2026	37.2 C (99.0 F)

Coldest night (TNn)

The coldest night of the year at Leland Bowman Lock, 1985 to 2026. The record is -11.7 C (10.9 F) in 1989, marked on the chart; the median year is -3.9 C (25.0 F).

Coldest night (TNn) at Leland Bowman Lock by year
Year	Coldest night (TNn)
1985	-3.3 C (26.1 F)
1986	-2.8 C (27.0 F)
1987	-5.0 C (23.0 F)
1988	-3.3 C (26.1 F)
1989	-11.7 C (10.9 F)
1990	-5.0 C (23.0 F)
1991	-2.2 C (28.0 F)
1992	-1.1 C (30.0 F)
1993	-2.2 C (28.0 F)
1994	-3.9 C (25.0 F)
1995	-3.3 C (26.1 F)
1996	-7.2 C (19.0 F)
1997	-2.2 C (28.0 F)
1998	0.6 C (33.1 F)
1999	-3.3 C (26.1 F)
2000	-2.2 C (28.0 F)
2001	-3.9 C (25.0 F)
2002	-5.6 C (21.9 F)
2003	-5.0 C (23.0 F)
2004	-6.7 C (19.9 F)
2005	-2.2 C (28.0 F)
2006	-1.7 C (28.9 F)
2007	-1.7 C (28.9 F)
2008	-4.4 C (24.1 F)
2009	-1.7 C (28.9 F)
2010	-5.6 C (21.9 F)
2011	-6.1 C (21.0 F)
2012	-2.2 C (28.0 F)
2013	-2.2 C (28.0 F)
2014	-6.1 C (21.0 F)
2015	-5.0 C (23.0 F)
2016	-1.7 C (28.9 F)
2017	-5.0 C (23.0 F)
2018	-9.4 C (15.1 F)
2019	-5.0 C (23.0 F)
2020	-1.7 C (28.9 F)
2021	-6.1 C (21.0 F)
2022	-6.1 C (21.0 F)
2023	1.1 C (34.0 F)
2024	-6.7 C (19.9 F)
2025	-8.3 C (17.1 F)
2026	-5.0 C (23.0 F)

Wettest day (Rx1day)

The wettest day of the year at Leland Bowman Lock, 1985 to 2026. The record is 214.9 mm (8.5 in) in 2018, marked on the chart; the median year is 122.6 mm (4.8 in).

Wettest day (Rx1day) at Leland Bowman Lock by year
Year	Wettest day (Rx1day)
1985	91.4 mm (3.6 in)
1986	90.4 mm (3.6 in)
1987	55.9 mm (2.2 in)
1988	63.5 mm (2.5 in)
1989	127.0 mm (5.0 in)
1990	58.4 mm (2.3 in)
1991	130.0 mm (5.1 in)
1992	108.0 mm (4.3 in)
1993	152.4 mm (6.0 in)
1994	63.5 mm (2.5 in)
1995	158.8 mm (6.3 in)
1996	127.0 mm (5.0 in)
1997	130.8 mm (5.1 in)
1998	157.5 mm (6.2 in)
1999	127.0 mm (5.0 in)
2000	109.2 mm (4.3 in)
2001	127.8 mm (5.0 in)
2002	127.0 mm (5.0 in)
2003	168.9 mm (6.6 in)
2004	95.8 mm (3.8 in)
2005	53.1 mm (2.1 in)
2006	101.6 mm (4.0 in)
2007	112.5 mm (4.4 in)
2008	49.0 mm (1.9 in)
2009	139.7 mm (5.5 in)
2010	94.0 mm (3.7 in)
2011	103.4 mm (4.1 in)
2012	118.1 mm (4.6 in)
2013	114.6 mm (4.5 in)
2014	147.3 mm (5.8 in)
2015	134.6 mm (5.3 in)
2016	130.0 mm (5.1 in)
2017	160.0 mm (6.3 in)
2018	214.9 mm (8.5 in)
2019	154.7 mm (6.1 in)
2020	95.3 mm (3.8 in)
2021	132.8 mm (5.2 in)
2022	106.7 mm (4.2 in)
2023	90.7 mm (3.6 in)
2024	210.8 mm (8.3 in)
2025	157.7 mm (6.2 in)
2026	68.6 mm (2.7 in)

Wettest five days (Rx5day)

The wettest five days of the year at Leland Bowman Lock, 1985 to 2026. The record is 362.4 mm (14.3 in) in 2001, marked on the chart; the median year is 198.2 mm (7.8 in).

Wettest five days (Rx5day) at Leland Bowman Lock by year
Year	Wettest five days (Rx5day)
1985	273.0 mm (10.7 in)
1986	145.6 mm (5.7 in)
1987	128.3 mm (5.1 in)
1988	137.1 mm (5.4 in)
1989	255.5 mm (10.1 in)
1990	72.9 mm (2.9 in)
1991	188.4 mm (7.4 in)
1992	154.9 mm (6.1 in)
1993	264.2 mm (10.4 in)
1994	123.2 mm (4.9 in)
1995	195.8 mm (7.7 in)
1996	246.7 mm (9.7 in)
1997	207.0 mm (8.1 in)
1998	251.4 mm (9.9 in)
1999	134.6 mm (5.3 in)
2000	213.1 mm (8.4 in)
2001	362.4 mm (14.3 in)
2002	161.8 mm (6.4 in)
2003	202.0 mm (8.0 in)
2004	200.6 mm (7.9 in)
2005	71.6 mm (2.8 in)
2006	138.7 mm (5.5 in)
2007	149.3 mm (5.9 in)
2008	85.9 mm (3.4 in)
2009	229.1 mm (9.0 in)
2010	95.0 mm (3.7 in)
2011	219.4 mm (8.6 in)
2012	191.6 mm (7.5 in)
2013	213.4 mm (8.4 in)
2014	202.2 mm (8.0 in)
2015	264.6 mm (10.4 in)
2016	233.2 mm (9.2 in)
2017	277.1 mm (10.9 in)
2018	285.8 mm (11.3 in)
2019	168.2 mm (6.6 in)
2020	109.5 mm (4.3 in)
2021	249.7 mm (9.8 in)
2022	141.0 mm (5.6 in)
2023	134.4 mm (5.3 in)
2024	210.8 mm (8.3 in)
2025	216.6 mm (8.5 in)
2026	105.5 mm (4.2 in)

Longest dry spell (CDD)

The longest dry spell of the year at Leland Bowman Lock, 1985 to 2026. The record is 63 days in 2008, marked on the chart; the median year is 23 days.

Longest dry spell (CDD) at Leland Bowman Lock by year
Year	Longest dry spell (CDD)
1985	15 days
1986	21 days
1987	30 days
1988	21 days
1989	30 days
1990	13 days
1991	28 days
1992	20 days
1993	15 days
1994	30 days
1995	23 days
1996	25 days
1997	17 days
1998	37 days
1999	34 days
2000	27 days
2001	36 days
2002	22 days
2003	38 days
2004	17 days
2005	27 days
2006	54 days
2007	22 days
2008	63 days
2009	19 days
2010	25 days
2011	28 days
2012	17 days
2013	16 days
2014	24 days
2015	26 days
2016	20 days
2017	23 days
2018	19 days
2019	22 days
2020	25 days
2021	14 days
2022	37 days
2023	21 days
2024	26 days
2025	19 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

22 years with a frost

Across 22 years with a frost, the median last spring frost at Leland Bowman Lock falls on 13 February and the median first autumn frost on 14 December, which leaves a median of 303 days between them.

Frost dates and growing season at Leland Bowman Lock
Measure	Median, all years	Earliest period	Recent period (1987 to 2025)	Recent against earliest	Fitted trend
Last spring frost	13 February	n/a	13 February	n/a	n/a
First autumn frost	14 December	n/a	14 December	n/a	n/a
Growing days	303 days	n/a	303 days	n/a	n/a

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

40 years, 1986 to 2025

A day with at least 119.7 mm (4.7 in) of rain is expected about once in 2 years. A day with at least 205.8 mm (8.1 in) of rain is expected about once in 100 years.

Rainfall return levels at Leland Bowman Lock: the daily rain expected about once in a given number of years
Expected about once in	A day with at least	Note
2 years	119.7 mm (4.7 in)
5 years	153.3 mm (6.0 in)
10 years	170.4 mm (6.7 in)
25 years	187.5 mm (7.4 in)
50 years	197.6 mm (7.8 in)	Longer than the 40 years of record
100 years	205.8 mm (8.1 in)	Longer than the 40 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, 40 years of values from 1986 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: 214.9 mm (8.5 in) in 2018; 210.8 mm (8.3 in) in 2024; 168.9 mm (6.6 in) in 2003.

Download the Data

Data for Leland Bowman Lock standing records by year: CSV or JSON. Field meanings are on the data page.
Data for Leland Bowman Lock 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 2026-10-12 (12 October 2026). Records are computed by this site and are not official.

Data as of 2026-10-13. Last revised 13 October 2026 (2026-10-13).