Somsen Ranch Weather Records (USS0011G01S)

Record envelope, standing records and threshold days for Somsen Ranch (USS0011G01S), Idaho, United States, with 48 years of record.

Key Facts for Somsen Ranch

Somsen Ranch (USS0011G01S) is a weather station in Idaho, United States at 42.95 latitude and -111.36 longitude, 2,073 m (6,800 ft) above sea level.
The station reports from 1979 to 2026, 48 years of record.
1,464 records set at Somsen Ranch still stand.
Records are tracked for tmax, tmin, prcp: an element needs 30 years of data to be eligible.
Somsen Ranch set a daily record high minimum temperature of 6.7 C (44.1 F) on 10 October 2026 (provisional).

Provisional Records

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

About the Station

Location: Idaho, United States, 42.95 latitude, -111.36 longitude.
Elevation: 2,073 m (6,800 ft).
Period of record: 1979 to 2026, 48 years.
Eligible elements: tmax, tmin, prcp.

Daily Record Envelope and 2026

27 days at or beyond a record

The band shows the record high and record low for each calendar day at Somsen Ranch. The lines show the 2026 daily maximum and minimum. 27 days in 2026 matched or passed a record. Temperatures are in degrees Celsius.

Daily record high and record low at Somsen Ranch, with 2026 drawn through them
Month	Highest record high	Lowest record low	2026 highest maximum	2026 lowest minimum
Jan	12.7 C (54.9 F)	-29.7 C (-21.5 F)	5.1 C (41.2 F)	-19.9 C (-3.8 F)
Feb	15.0 C (59.0 F)	-29.3 C (-20.7 F)	10.3 C (50.5 F)	-18.3 C (-0.9 F)
Mar	21.1 C (70.0 F)	-26.5 C (-15.7 F)	21.1 C (70.0 F)	-14.5 C (5.9 F)
Apr	24.6 C (76.3 F)	-18.1 C (-0.6 F)	20.2 C (68.4 F)	-11.2 C (11.8 F)
May	28.3 C (82.9 F)	-10.8 C (12.6 F)	25.7 C (78.3 F)	-8.5 C (16.7 F)
Jun	32.5 C (90.5 F)	-12.8 C (9.0 F)	27.5 C (81.5 F)	-12.8 C (9.0 F)
Jul	34.4 C (93.9 F)	-2.7 C (27.1 F)	34.4 C (93.9 F)	8.8 C (47.8 F)
Aug	34.1 C (93.4 F)	-6.0 C (21.2 F)	32.4 C (90.3 F)	2.2 C (36.0 F)
Sep	31.2 C (88.2 F)	-8.6 C (16.5 F)	24.2 C (75.6 F)	-0.5 C (31.1 F)
Oct	27.1 C (80.8 F)	-24.0 C (-11.2 F)	24.5 C (76.1 F)	0.4 C (32.7 F)
Nov	18.2 C (64.8 F)	-28.1 C (-18.6 F)	n/a	n/a
Dec	11.2 C (52.2 F)	-33.2 C (-27.8 F)	n/a	n/a

Which Years Hold Standing Records

1,464 standing records

1,464 records at Somsen Ranch still stand. 2003 holds the most, with 63.

Standing records at Somsen Ranch by the year they were set
Year set	Standing records
1989	10
1990	43
1991	28
1992	33
1993	53
1994	30
1995	46
1996	49
1997	25
1998	26
1999	36
2000	39
2001	44
2002	41
2003	63
2004	28
2005	35
2006	49
2007	45
2008	42
2009	42
2010	34
2011	32
2012	32
2013	49
2014	39
2015	50
2016	33
2017	43
2018	31
2019	31
2020	54
2021	35
2022	37
2023	22
2024	42
2025	46
2026	47

All-Time Record Progression

3 new records

3 all-time records were set at Somsen Ranch between 7 August 2020 and 10 August 2020. Each dot is a new record.

When Somsen Ranch set new all-time records
Date	Kind	Detail
2020-08-07	Record high minimum temperature	Record high minimum temperature 16.7 C (62.1 F)
2020-08-08	Record high minimum temperature	Record high minimum temperature 17.5 C (63.5 F)
2020-08-10	Record high minimum temperature	Record high minimum temperature 17.8 C (64.0 F)

Wettest Day of Each Month

Oct: 91.4 mm (3.6 in)

The wettest day on record for each calendar month at Somsen Ranch. The most was 91.4 mm (3.6 in) on 24 October 2010.

Record daily precipitation for each month at Somsen Ranch
Month	Record daily precipitation (mm)	Date
Jan	27.9 mm (1.1 in)	11 January 1998
Feb	33.0 mm (1.3 in)	4 February 2019
Mar	33.0 mm (1.3 in)	4 March 1991
Apr	33.0 mm (1.3 in)	27 April 1990
May	43.2 mm (1.7 in)	5 May 1993
Jun	45.7 mm (1.8 in)	18 June 2004
Jul	43.2 mm (1.7 in)	3 July 1995
Aug	40.6 mm (1.6 in)	7 August 2016
Sep	50.8 mm (2.0 in)	16 September 2015
Oct	91.4 mm (3.6 in)	24 October 2010
Nov	30.5 mm (1.2 in)	18 November 1996
Dec	27.9 mm (1.1 in)	25 December 2008

Period of Record Coverage

1989 to 2026

38 years of record at Somsen Ranch, 1989 to 2026. 4 years have data for under 90 percent of days and are left out of rankings: 1989, 2022, 2023, 2026.

Days with data per year at Somsen Ranch
Year	Days with data	Share of year	Complete
1989	202	55%	No
1990	363	99%	Yes
1991	358	98%	Yes
1992	363	99%	Yes
1993	348	95%	Yes
1994	352	96%	Yes
1995	365	100%	Yes
1996	366	100%	Yes
1997	365	100%	Yes
1998	365	100%	Yes
1999	364	100%	Yes
2000	366	100%	Yes
2001	360	99%	Yes
2002	365	100%	Yes
2003	363	99%	Yes
2004	366	100%	Yes
2005	365	100%	Yes
2006	365	100%	Yes
2007	365	100%	Yes
2008	366	100%	Yes
2009	365	100%	Yes
2010	365	100%	Yes
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	356	97%	Yes
2021	365	100%	Yes
2022	246	67%	No
2023	228	62%	No
2024	366	100%	Yes
2025	355	97%	Yes
2026	281	77%	No

Latest Records

Latest records at Somsen Ranch
Date	Station	Record	Value	Beat old record by	Old record stood	Significance
10 October 2026	Somsen Ranch, US	daily high min (Provisional)	6.7 C (44.1 F)	0.2 C (0.4 F)	0 years	3 of 100 (Routine)
9 October 2026	Somsen Ranch, US	daily high min (Provisional)	5.1 C (41.2 F)	0.3 C (0.5 F)	1 year	3 of 100 (Routine)
8 October 2026	Somsen Ranch, US	daily high min (Provisional)	4.5 C (40.1 F)	0.2 C (0.4 F)	23 years	9 of 100 (Routine)
7 October 2026	Somsen Ranch, US	daily high min (Tie, Provisional)	4.4 C (39.9 F)	tie	5 years	1 of 100 (Routine)
6 October 2026	Somsen Ranch, US	daily high min (Provisional)	6.6 C (43.9 F)	1.9 C (3.4 F)	16 years	11 of 100 (Routine)
6 October 2026	Somsen Ranch, US	daily high max (Provisional)	23.3 C (73.9 F)	1.6 C (2.9 F)	5 years	6 of 100 (Routine)
5 October 2026	Somsen Ranch, US	daily high min (Provisional)	8.4 C (47.1 F)	1.2 C (2.2 F)	32 years	14 of 100 (Routine)
5 October 2026	Somsen Ranch, US	daily high max (Provisional)	24.5 C (76.1 F)	1.2 C (2.2 F)	32 years	13 of 100 (Routine)
4 October 2026	Somsen Ranch, US	daily high min (Provisional)	7.5 C (45.5 F)	1.3 C (2.3 F)	16 years	9 of 100 (Routine)
18 September 2026	Somsen Ranch, US	daily rain (Provisional)	15.2 mm (0.6 in)	2.5 mm (0.10 in)	12 years	10 of 100 (Routine)
17 September 2026	Somsen Ranch, US	daily high min (Provisional)	9.6 C (49.3 F)	0.4 C (0.7 F)	12 years	7 of 100 (Routine)
1 September 2026	Somsen Ranch, US	daily rain (Tie, Provisional)	12.7 mm (0.5 in)	tie	25 years	2 of 100 (Routine)
28 August 2026	Somsen Ranch, US	daily rain (Provisional)	7.6 mm (0.30 in)	2.5 mm (0.10 in)	16 years	11 of 100 (Routine)
27 August 2026	Somsen Ranch, US	daily high min (Provisional)	13.8 C (56.8 F)	1.4 C (2.5 F)	27 years	15 of 100 (Routine)
22 August 2026	Somsen Ranch, US	daily high min (Provisional)	13.5 C (56.3 F)	1.0 C (1.8 F)	5 years	7 of 100 (Routine)
21 August 2026	Somsen Ranch, US	daily high min (Provisional)	12.4 C (54.3 F)	0.7 C (1.3 F)	23 years	11 of 100 (Routine)
21 August 2026	Somsen Ranch, US	daily high max (Provisional)	31.3 C (88.3 F)	0.6 C (1.1 F)	16 years	9 of 100 (Routine)
16 August 2026	Somsen Ranch, US	daily rain	5.1 mm (0.20 in)	2.6 mm (0.10 in)	36 years	17 of 100 (Routine)
13 August 2026	Somsen Ranch, US	daily low max	12.5 C (54.5 F)	5.9 C (10.6 F)	31 years	26 of 100 (Routine)
29 July 2026	Somsen Ranch, US	daily rain	12.7 mm (0.5 in)	7.6 mm (0.30 in)	44 years	20 of 100 (Routine)

Climate Trend

33 complete years, 1990 to 2024

One stripe for each of 33 complete years at Somsen Ranch, 1990 to 2024. Blue stripes are years cooler than the station's own mean of 4.5 C (40.1 F); red stripes are warmer. The coolest year was 1993, at 2.5 C (36.5 F), and the warmest was 2015, at 5.6 C (42.0 F). The strongest colour marks a difference of 2.0 C (3.6 F).

Annual mean temperature at Somsen Ranch as warming stripes, 1990 to 2024
Year	Annual mean temperature	Difference from the station mean
1990	3.8 C	-0.71 C
1991	4.0 C	-0.50 C
1992	4.7 C	+0.20 C
1993	2.5 C	-1.98 C
1994	4.6 C	+0.12 C
1995	4.2 C	-0.34 C
1996	4.0 C	-0.52 C
1997	3.7 C	-0.79 C
1998	4.5 C	-0.04 C
1999	4.4 C	-0.06 C
2000	4.5 C	+0.04 C
2001	4.9 C	+0.42 C
2002	3.8 C	-0.72 C
2003	5.0 C	+0.54 C
2004	4.4 C	-0.13 C
2005	4.7 C	+0.23 C
2006	5.0 C	+0.52 C
2007	5.5 C	+1.03 C
2008	4.3 C	-0.19 C
2009	3.9 C	-0.60 C
2010	4.2 C	-0.26 C
2011	3.4 C	-1.06 C
2012	5.4 C	+0.90 C
2013	4.2 C	-0.31 C
2014	4.9 C	+0.44 C
2015	5.6 C	+1.06 C
2016	5.3 C	+0.81 C
2017	5.0 C	+0.47 C
2018	4.9 C	+0.39 C
2019	3.9 C	-0.62 C
2020	4.6 C	+0.08 C
2021	5.3 C	+0.79 C
2024	5.1 C	+0.63 C

The annual mean temperature here has risen by 0.3 C (0.1 to 0.5) per decade over 1990 to 2024. In Fahrenheit: 0.6 F (0.2 to 1.0) per decade. The slope is a straight line fitted to 33 complete years; the brackets give its 95 percent interval.

Fitted temperature trends per decade at Somsen Ranch
Measure	Per decade (C)	Per decade (F)	Period	Complete years	Reading
Annual mean temperature	0.3 C (0.1 to 0.5) per decade	0.6 F (0.2 to 1.0) per decade	1990 to 2024	33	Rise
Mean daily maximum	0.4 C (0.2 to 0.7) per decade	0.8 F (0.4 to 1.2) per decade	1990 to 2024	33	Rise
Mean daily minimum	0.20 C (-0.01 to 0.42) per decade	0.37 F (-0.02 to 0.76) per decade	1990 to 2024	33	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

1979 to 2026

Yearly extremes at Somsen Ranch: 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)	2002	31.7 C (89.1 F)	38
Coldest night (TNn)	-33.2 C (-27.8 F)	1990	-24.3 C (-11.7 F)	38
Wettest day (Rx1day)	91.4 mm (3.6 in)	2010	27.9 mm (1.1 in)	48
Wettest five days (Rx5day)	104.1 mm (4.1 in)	1993	55.8 mm (2.2 in)	47
Longest dry spell (CDD)	62 days	1987	27 days	48

Hottest day (TXx)

The hottest day of the year at Somsen Ranch, 1979 to 2026. The record is 34.4 C (93.9 F) in 2002, marked on the chart; the median year is 31.7 C (89.1 F).

Hottest day (TXx) at Somsen Ranch by year
Year	Hottest day (TXx)
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	30.9 C (87.6 F)
1990	31.0 C (87.8 F)
1991	29.0 C (84.2 F)
1992	31.7 C (89.1 F)
1993	26.2 C (79.2 F)
1994	31.3 C (88.3 F)
1995	29.4 C (84.9 F)
1996	30.6 C (87.1 F)
1997	29.0 C (84.2 F)
1998	30.4 C (86.7 F)
1999	29.3 C (84.7 F)
2000	33.2 C (91.8 F)
2001	31.9 C (89.4 F)
2002	34.4 C (93.9 F)
2003	33.0 C (91.4 F)
2004	29.8 C (85.6 F)
2005	32.5 C (90.5 F)
2006	32.7 C (90.9 F)
2007	32.9 C (91.2 F)
2008	32.7 C (90.9 F)
2009	31.0 C (87.8 F)
2010	30.7 C (87.3 F)
2011	30.9 C (87.6 F)
2012	32.8 C (91.0 F)
2013	31.8 C (89.2 F)
2014	31.7 C (89.1 F)
2015	32.5 C (90.5 F)
2016	31.6 C (88.9 F)
2017	32.3 C (90.1 F)
2018	34.1 C (93.4 F)
2019	31.5 C (88.7 F)
2020	32.6 C (90.7 F)
2021	33.2 C (91.8 F)
2022	28.1 C (82.6 F)
2023	23.6 C (74.5 F)
2024	33.1 C (91.6 F)
2025	32.1 C (89.8 F)
2026	34.4 C (93.9 F)

Coldest night (TNn)

The coldest night of the year at Somsen Ranch, 1979 to 2026. The record is -33.2 C (-27.8 F) in 1990, marked on the chart; the median year is -24.3 C (-11.7 F).

Coldest night (TNn) at Somsen Ranch by year
Year	Coldest night (TNn)
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	-20.9 C (-5.6 F)
1990	-33.2 C (-27.8 F)
1991	-29.7 C (-21.5 F)
1992	-22.3 C (-8.1 F)
1993	-28.1 C (-18.6 F)
1994	-25.7 C (-14.3 F)
1995	-24.0 C (-11.2 F)
1996	-28.2 C (-18.8 F)
1997	-23.4 C (-10.1 F)
1998	-27.9 C (-18.2 F)
1999	-22.6 C (-8.7 F)
2000	-19.7 C (-3.5 F)
2001	-23.5 C (-10.3 F)
2002	-26.5 C (-15.7 F)
2003	-21.8 C (-7.2 F)
2004	-22.6 C (-8.7 F)
2005	-25.1 C (-13.2 F)
2006	-23.4 C (-10.1 F)
2007	-26.7 C (-16.1 F)
2008	-22.9 C (-9.2 F)
2009	-26.2 C (-15.2 F)
2010	-25.8 C (-14.4 F)
2011	-29.3 C (-20.7 F)
2012	-22.9 C (-9.2 F)
2013	-30.1 C (-22.2 F)
2014	-25.4 C (-13.7 F)
2015	-23.2 C (-9.8 F)
2016	-24.0 C (-11.2 F)
2017	-26.8 C (-16.2 F)
2018	-22.8 C (-9.0 F)
2019	-24.0 C (-11.2 F)
2020	-21.8 C (-7.2 F)
2021	-22.4 C (-8.3 F)
2022	-25.4 C (-13.7 F)
2023	-29.3 C (-20.7 F)
2024	-24.6 C (-12.3 F)
2025	-27.8 C (-18.0 F)
2026	-19.9 C (-3.8 F)

Wettest day (Rx1day)

The wettest day of the year at Somsen Ranch, 1979 to 2026. The record is 91.4 mm (3.6 in) in 2010, marked on the chart; the median year is 27.9 mm (1.1 in).

Wettest day (Rx1day) at Somsen Ranch by year
Year	Wettest day (Rx1day)
1979	20.3 mm (0.8 in)
1980	10.2 mm (0.4 in)
1981	33.0 mm (1.3 in)
1982	25.4 mm (1.0 in)
1983	25.4 mm (1.0 in)
1984	17.8 mm (0.7 in)
1985	25.4 mm (1.0 in)
1986	33.0 mm (1.3 in)
1987	20.3 mm (0.8 in)
1988	25.4 mm (1.0 in)
1989	20.3 mm (0.8 in)
1990	33.0 mm (1.3 in)
1991	33.0 mm (1.3 in)
1992	17.8 mm (0.7 in)
1993	43.2 mm (1.7 in)
1994	20.3 mm (0.8 in)
1995	43.2 mm (1.7 in)
1996	30.5 mm (1.2 in)
1997	22.9 mm (0.9 in)
1998	27.9 mm (1.1 in)
1999	38.1 mm (1.5 in)
2000	22.9 mm (0.9 in)
2001	30.5 mm (1.2 in)
2002	22.9 mm (0.9 in)
2003	20.3 mm (0.8 in)
2004	45.7 mm (1.8 in)
2005	27.9 mm (1.1 in)
2006	25.4 mm (1.0 in)
2007	30.5 mm (1.2 in)
2008	30.5 mm (1.2 in)
2009	22.9 mm (0.9 in)
2010	91.4 mm (3.6 in)
2011	25.4 mm (1.0 in)
2012	25.4 mm (1.0 in)
2013	38.1 mm (1.5 in)
2014	35.6 mm (1.4 in)
2015	50.8 mm (2.0 in)
2016	40.6 mm (1.6 in)
2017	30.5 mm (1.2 in)
2018	27.9 mm (1.1 in)
2019	50.8 mm (2.0 in)
2020	22.9 mm (0.9 in)
2021	35.6 mm (1.4 in)
2022	35.6 mm (1.4 in)
2023	22.9 mm (0.9 in)
2024	33.0 mm (1.3 in)
2025	43.2 mm (1.7 in)
2026	27.9 mm (1.1 in)

Wettest five days (Rx5day)

The wettest five days of the year at Somsen Ranch, 1979 to 2026. The record is 104.1 mm (4.1 in) in 1993, marked on the chart; the median year is 55.8 mm (2.2 in).

Wettest five days (Rx5day) at Somsen Ranch by year
Year	Wettest five days (Rx5day)
1979	n/a
1980	35.6 mm (1.4 in)
1981	53.3 mm (2.1 in)
1982	48.3 mm (1.9 in)
1983	55.9 mm (2.2 in)
1984	40.7 mm (1.6 in)
1985	48.3 mm (1.9 in)
1986	94.0 mm (3.7 in)
1987	50.9 mm (2.0 in)
1988	55.9 mm (2.2 in)
1989	58.4 mm (2.3 in)
1990	55.8 mm (2.2 in)
1991	68.6 mm (2.7 in)
1992	43.2 mm (1.7 in)
1993	104.1 mm (4.1 in)
1994	40.7 mm (1.6 in)
1995	50.9 mm (2.0 in)
1996	91.3 mm (3.6 in)
1997	48.2 mm (1.9 in)
1998	63.5 mm (2.5 in)
1999	61.0 mm (2.4 in)
2000	66.2 mm (2.6 in)
2001	58.4 mm (2.3 in)
2002	45.6 mm (1.8 in)
2003	38.1 mm (1.5 in)
2004	53.3 mm (2.1 in)
2005	55.8 mm (2.2 in)
2006	58.3 mm (2.3 in)
2007	53.3 mm (2.1 in)
2008	63.4 mm (2.5 in)
2009	50.7 mm (2.0 in)
2010	96.4 mm (3.8 in)
2011	50.8 mm (2.0 in)
2012	91.4 mm (3.6 in)
2013	58.4 mm (2.3 in)
2014	71.2 mm (2.8 in)
2015	101.6 mm (4.0 in)
2016	73.7 mm (2.9 in)
2017	81.3 mm (3.2 in)
2018	40.6 mm (1.6 in)
2019	63.4 mm (2.5 in)
2020	48.2 mm (1.9 in)
2021	76.2 mm (3.0 in)
2022	58.4 mm (2.3 in)
2023	48.3 mm (1.9 in)
2024	53.3 mm (2.1 in)
2025	48.3 mm (1.9 in)
2026	48.1 mm (1.9 in)

Longest dry spell (CDD)

The longest dry spell of the year at Somsen Ranch, 1979 to 2026. The record is 62 days in 1987, marked on the chart; the median year is 27 days.

Longest dry spell (CDD) at Somsen Ranch by year
Year	Longest dry spell (CDD)
1979	1 day
1980	26 days
1981	36 days
1982	18 days
1983	15 days
1984	34 days
1985	31 days
1986	26 days
1987	62 days
1988	42 days
1989	46 days
1990	22 days
1991	27 days
1992	41 days
1993	26 days
1994	28 days
1995	22 days
1996	30 days
1997	18 days
1998	25 days
1999	41 days
2000	28 days
2001	51 days
2002	41 days
2003	30 days
2004	15 days
2005	42 days
2006	23 days
2007	57 days
2008	22 days
2009	29 days
2010	24 days
2011	23 days
2012	37 days
2013	15 days
2014	23 days
2015	21 days
2016	28 days
2017	27 days
2018	23 days
2019	25 days
2020	26 days
2021	49 days
2022	23 days
2023	13 days
2024	28 days
2025	44 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

33 years with a frost

Across 33 years with a frost, the median last spring frost at Somsen Ranch falls on 17 June and the median first autumn frost on 2 September, which leaves a median of 81 days between them.

Fitted over all years, the growing season changes by +9.5 days per decade at this station.

Frost dates and growing season at Somsen Ranch
Measure	Median, all years	Earliest period	Recent period (1993 to 2024)	Recent against earliest	Fitted trend
Last spring frost	17 June	n/a	18 June	n/a	-2.6 days per decade
First autumn frost	2 September	n/a	2 September	n/a	+6.8 days per decade
Growing days	81 days	n/a	80 days	n/a	+9.5 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

44 years, 1981 to 2025

A day with at least 28.8 mm (1.1 in) of rain is expected about once in 2 years. A day with at least 77.9 mm (3.1 in) of rain is expected about once in 100 years.

Rainfall return levels at Somsen Ranch: the daily rain expected about once in a given number of years
Expected about once in	A day with at least	Note
2 years	28.8 mm (1.1 in)
5 years	38.4 mm (1.5 in)
10 years	46.0 mm (1.8 in)
25 years	57.2 mm (2.3 in)
50 years	66.9 mm (2.6 in)	Longer than the 44 years of record
100 years	77.9 mm (3.1 in)	Longer than the 44 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, 44 years of values from 1981 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: 91.4 mm (3.6 in) in 2010; 50.8 mm (2.0 in) in 2015; 50.8 mm (2.0 in) in 2019.

Download the Data

Data for Somsen Ranch standing records by year: CSV or JSON. Field meanings are on the data page.
Data for Somsen Ranch 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 2026-10-17 (17 October 2026). Records are computed by this site and are not official.

Data as of 2026-10-17. Last revised 17 October 2026 (2026-10-17).