Red Hill Weather Records (USS0021D04S)

Record envelope, standing records and threshold days for Red Hill (USS0021D04S), Oregon, United States, with 49 years of record.

Key Facts for Red Hill

Red Hill (USS0021D04S) is a weather station in Oregon, United States at 45.46 latitude and -121.70 longitude, 1,344 m (4,410 ft) above sea level.
The station reports from 1978 to 2026, 49 years of record.
1,464 records set at Red Hill still stand.
Records are tracked for tmax, tmin, prcp: an element needs 30 years of data to be eligible.
Red Hill set a daily record high maximum temperature of 23.6 C (74.5 F) on 8 October 2026 (provisional).

Provisional Records

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

About the Station

Location: Oregon, United States, 45.46 latitude, -121.70 longitude.
Elevation: 1,344 m (4,410 ft).
Period of record: 1978 to 2026, 49 years.
Eligible elements: tmax, tmin, prcp.

Daily Record Envelope and 2026

8 days at or beyond a record

The band shows the record high and record low for each calendar day at Red Hill. The lines show the 2026 daily maximum and minimum. 8 days in 2026 matched or passed a record. Temperatures are in degrees Celsius.

Daily record high and record low at Red Hill, with 2026 drawn through them
Month	Highest record high	Lowest record low	2026 highest maximum	2026 lowest minimum
Jan	20.4 C (68.7 F)	-23.8 C (-10.8 F)	16.9 C (62.4 F)	-11.6 C (11.1 F)
Feb	20.8 C (69.4 F)	-27.3 C (-17.1 F)	16.3 C (61.3 F)	-7.7 C (18.1 F)
Mar	19.5 C (67.1 F)	-16.5 C (2.3 F)	15.7 C (60.3 F)	-6.0 C (21.2 F)
Apr	23.4 C (74.1 F)	-12.5 C (9.5 F)	18.7 C (65.7 F)	-5.3 C (22.5 F)
May	28.4 C (83.1 F)	-6.7 C (19.9 F)	23.3 C (73.9 F)	-2.2 C (28.0 F)
Jun	36.0 C (96.8 F)	-3.9 C (25.0 F)	29.1 C (84.4 F)	0.2 C (32.4 F)
Jul	35.3 C (95.5 F)	0.1 C (32.2 F)	29.9 C (85.8 F)	2.3 C (36.1 F)
Aug	34.2 C (93.6 F)	0.6 C (33.1 F)	30.2 C (86.4 F)	4.5 C (40.1 F)
Sep	34.3 C (93.7 F)	-3.7 C (25.3 F)	25.1 C (77.2 F)	0.1 C (32.2 F)
Oct	28.7 C (83.7 F)	-11.9 C (10.6 F)	23.6 C (74.5 F)	-0.4 C (31.3 F)
Nov	19.6 C (67.3 F)	-18.2 C (-0.8 F)	n/a	n/a
Dec	19.5 C (67.1 F)	-25.0 C (-13.0 F)	n/a	n/a

Which Years Hold Standing Records

1,464 standing records

1,464 records at Red Hill still stand. 1996 holds the most, with 70.

Standing records at Red Hill by the year they were set
Year set	Standing records
1988	8
1989	35
1990	40
1991	33
1992	46
1993	52
1994	42
1995	38
1996	70
1997	31
1998	22
1999	51
2000	32
2001	36
2002	36
2003	39
2004	26
2005	28
2006	36
2007	37
2008	69
2009	46
2010	23
2011	39
2012	38
2013	33
2014	52
2015	40
2016	27
2017	44
2018	17
2019	48
2020	32
2021	40
2022	56
2023	29
2024	39
2025	30
2026	24

All-Time Record Progression

5 new records

5 all-time records were set at Red Hill between 28 June 2021 and 4 November 2022. Each dot is a new record.

When Red Hill set new all-time records
Date	Kind	Detail
2021-06-28	Record high maximum temperature	Record high maximum temperature 35.4 C (95.7 F)
2021-06-29	Record high maximum temperature	Record high maximum temperature 36.0 C (96.8 F)
2022-07-29	Record high minimum temperature	Record high minimum temperature 24.0 C (75.2 F)
2022-07-30	Record high minimum temperature	Record high minimum temperature 24.2 C (75.6 F)
2022-11-04	Record daily precipitation	Record daily precipitation 198.1 mm (7.8 in)

Wettest Day of Each Month

Nov: 198.1 mm (7.8 in)

The wettest day on record for each calendar month at Red Hill. The most was 198.1 mm (7.8 in) on 4 November 2022.

Record daily precipitation for each month at Red Hill
Month	Record daily precipitation (mm)	Date
Jan	152.4 mm (6.0 in)	1 January 2009
Feb	129.5 mm (5.1 in)	9 February 1990
Mar	124.5 mm (4.9 in)	27 March 1989
Apr	119.4 mm (4.7 in)	19 April 1985
May	73.7 mm (2.9 in)	3 May 2010
Jun	144.8 mm (5.7 in)	6 June 1985
Jul	55.9 mm (2.2 in)	13 July 1983
Aug	73.7 mm (2.9 in)	20 August 2008
Sep	99.1 mm (3.9 in)	30 September 2000
Oct	167.6 mm (6.6 in)	31 October 1994
Nov	198.1 mm (7.8 in)	4 November 2022
Dec	167.6 mm (6.6 in)	18 December 2025

Period of Record Coverage

1988 to 2026

39 years of record at Red Hill, 1988 to 2026. 2 years have data for under 90 percent of days and are left out of rankings: 1988, 2026.

Days with data per year at Red Hill
Year	Days with data	Share of year	Complete
1988	52	14%	No
1989	363	99%	Yes
1990	356	98%	Yes
1991	362	99%	Yes
1992	364	99%	Yes
1993	344	94%	Yes
1994	348	95%	Yes
1995	365	100%	Yes
1996	364	99%	Yes
1997	365	100%	Yes
1998	359	98%	Yes
1999	352	96%	Yes
2000	366	100%	Yes
2001	337	92%	Yes
2002	365	100%	Yes
2003	364	100%	Yes
2004	350	96%	Yes
2005	365	100%	Yes
2006	362	99%	Yes
2007	365	100%	Yes
2008	365	100%	Yes
2009	364	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	363	99%	Yes
2018	365	100%	Yes
2019	365	100%	Yes
2020	366	100%	Yes
2021	363	99%	Yes
2022	364	100%	Yes
2023	359	98%	Yes
2024	356	97%	Yes
2025	352	96%	Yes
2026	283	78%	No

Latest Records

Latest records at Red Hill
Date	Station	Record	Value	Beat old record by	Old record stood	Significance
8 October 2026	Red Hill, US	daily high max (Provisional)	23.6 C (74.5 F)	0.1 C (0.2 F)	29 years	11 of 100 (Routine)
13 September 2026	Red Hill, US	daily low max (Provisional)	6.8 C (44.2 F)	0.7 C (1.3 F)	21 years	10 of 100 (Routine)
6 September 2026	Red Hill, US	daily low max (Provisional)	8.4 C (47.1 F)	0.3 C (0.5 F)	16 years	8 of 100 (Routine)
21 August 2026	Red Hill, US	daily high min (Provisional)	18.0 C (64.4 F)	1.8 C (3.2 F)	4 years	8 of 100 (Routine)
20 August 2026	Red Hill, US	daily high min (Provisional)	16.7 C (62.1 F)	1.6 C (2.9 F)	20 years	13 of 100 (Routine)
20 August 2026	Red Hill, US	daily high max (Provisional)	30.2 C (86.4 F)	0.7 C (1.3 F)	9 years	6 of 100 (Routine)
6 August 2026	Red Hill, US	daily high max	29.9 C (85.8 F)	0.2 C (0.4 F)	7 years	5 of 100 (Routine)
28 June 2026	Red Hill, US	daily low max	8.0 C (46.4 F)	0.4 C (0.7 F)	32 years	12 of 100 (Routine)
27 June 2026	Red Hill, US	daily low max	6.2 C (43.2 F)	2.3 C (4.1 F)	29 years	14 of 100 (Routine)
19 June 2026	Red Hill, US	daily high max	26.5 C (79.7 F)	1.8 C (3.2 F)	8 years	7 of 100 (Routine)
15 June 2026	Red Hill, US	daily high min	14.5 C (58.1 F)	3.8 C (6.8 F)	11 years	15 of 100 (Routine)
15 June 2026	Red Hill, US	daily high max	29.1 C (84.4 F)	5.4 C (9.7 F)	11 years	14 of 100 (Routine)
14 June 2026	Red Hill, US	daily high min	13.3 C (55.9 F)	3.7 C (6.7 F)	27 years	20 of 100 (Routine)
16 May 2026	Red Hill, US	daily low max	0.6 C (33.1 F)	0.8 C (1.4 F)	28 years	12 of 100 (Routine)
13 May 2026	Red Hill, US	daily rain	38.1 mm (1.5 in)	7.6 mm (0.30 in)	16 years	15 of 100 (Routine)
3 May 2026	Red Hill, US	daily high min	9.1 C (48.4 F)	1.8 C (3.2 F)	33 years	17 of 100 (Routine)
3 May 2026	Red Hill, US	daily high max	23.3 C (73.9 F)	1.7 C (3.1 F)	33 years	15 of 100 (Routine)
2 May 2026	Red Hill, US	daily high min	8.3 C (46.9 F)	1.2 C (2.2 F)	9 years	8 of 100 (Routine)
2 May 2026	Red Hill, US	daily high max	21.1 C (70.0 F)	0.3 C (0.5 F)	9 years	5 of 100 (Routine)
15 April 2026	Red Hill, US	daily rain	55.9 mm (2.2 in)	10.2 mm (0.4 in)	44 years	24 of 100 (Routine)

Climate Trend

35 complete years, 1989 to 2024

One stripe for each of 35 complete years at Red Hill, 1989 to 2024. Blue stripes are years cooler than the station's own mean of 5.8 C (42.4 F); red stripes are warmer. The coolest year was 1993, at 4.7 C (40.4 F), and the warmest was 2015, at 7.7 C (45.8 F). The strongest colour marks a difference of 1.9 C (3.4 F).

Annual mean temperature at Red Hill as warming stripes, 1989 to 2024
Year	Annual mean temperature	Difference from the station mean
1989	5.6 C	-0.24 C
1990	5.6 C	-0.19 C
1991	5.9 C	+0.14 C
1992	6.7 C	+0.94 C
1993	4.7 C	-1.11 C
1994	6.1 C	+0.25 C
1995	5.6 C	-0.22 C
1996	5.4 C	-0.44 C
1997	5.3 C	-0.47 C
1998	6.0 C	+0.17 C
1999	5.4 C	-0.40 C
2000	4.9 C	-0.92 C
2002	5.6 C	-0.16 C
2003	6.1 C	+0.27 C
2004	6.2 C	+0.37 C
2005	5.7 C	-0.10 C
2006	5.9 C	+0.06 C
2007	5.5 C	-0.31 C
2008	5.0 C	-0.80 C
2009	5.4 C	-0.40 C
2010	5.1 C	-0.69 C
2011	4.9 C	-0.92 C
2012	5.7 C	-0.09 C
2013	6.2 C	+0.36 C
2014	6.4 C	+0.60 C
2015	7.7 C	+1.86 C
2016	6.1 C	+0.33 C
2017	5.8 C	-0.03 C
2018	6.1 C	+0.27 C
2019	5.3 C	-0.50 C
2020	6.2 C	+0.39 C
2021	6.3 C	+0.52 C
2022	6.4 C	+0.56 C
2023	6.2 C	+0.37 C
2024	6.2 C	+0.43 C

The fitted trend in annual mean temperature here over 1989 to 2024 is 0.18 C (0.00 to 0.37) per decade. The interval includes zero, so the trend is not clearly different from zero. In Fahrenheit: 0.33 F (-0.01 to 0.66) per decade. The slope is a straight line fitted to 35 complete years; the brackets give its 95 percent interval.

Fitted temperature trends per decade at Red Hill
Measure	Per decade (C)	Per decade (F)	Period	Complete years	Reading
Annual mean temperature	0.18 C (0.00 to 0.37) per decade	0.33 F (-0.01 to 0.66) per decade	1989 to 2024	35	Not clearly different from zero
Mean daily maximum	-0.04 C (-0.24 to 0.17) per decade	-0.1 F (-0.4 to 0.3) per decade	1989 to 2024	35	Not clearly different from zero
Mean daily minimum	0.4 C (0.2 to 0.6) per decade	0.7 F (0.4 to 1.0) per decade	1989 to 2024	35	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

1978 to 2026

Yearly extremes at Red Hill: the record and the median year
Measure	Record	Year of the record	Median year	Years with a value
Hottest day (TXx)	36.0 C (96.8 F)	2021	31.7 C (89.1 F)	39
Coldest night (TNn)	-27.3 C (-17.1 F)	1989	-17.1 C (1.2 F)	39
Wettest day (Rx1day)	198.1 mm (7.8 in)	2022	109.2 mm (4.3 in)	49
Wettest five days (Rx5day)	393.7 mm (15.5 in)	2006	266.7 mm (10.5 in)	49
Longest dry spell (CDD)	88 days	1985	32 days	49

Hottest day (TXx)

The hottest day of the year at Red Hill, 1978 to 2026. The record is 36.0 C (96.8 F) in 2021, marked on the chart; the median year is 31.7 C (89.1 F).

Hottest day (TXx) at Red Hill by year
Year	Hottest day (TXx)
1978	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	14.8 C (58.6 F)
1989	29.1 C (84.4 F)
1990	32.7 C (90.9 F)
1991	29.8 C (85.6 F)
1992	34.0 C (93.2 F)
1993	29.1 C (84.4 F)
1994	34.4 C (93.9 F)
1995	28.7 C (83.7 F)
1996	33.1 C (91.6 F)
1997	30.9 C (87.6 F)
1998	34.3 C (93.7 F)
1999	29.2 C (84.6 F)
2000	30.8 C (87.4 F)
2001	28.4 C (83.1 F)
2002	34.4 C (93.9 F)
2003	33.9 C (93.0 F)
2004	32.3 C (90.1 F)
2005	31.1 C (88.0 F)
2006	33.8 C (92.8 F)
2007	31.0 C (87.8 F)
2008	32.5 C (90.5 F)
2009	33.5 C (92.3 F)
2010	30.4 C (86.7 F)
2011	29.2 C (84.6 F)
2012	31.2 C (88.2 F)
2013	30.4 C (86.7 F)
2014	31.4 C (88.5 F)
2015	33.0 C (91.4 F)
2016	30.2 C (86.4 F)
2017	33.4 C (92.1 F)
2018	32.0 C (89.6 F)
2019	29.8 C (85.6 F)
2020	31.7 C (89.1 F)
2021	36.0 C (96.8 F)
2022	35.3 C (95.5 F)
2023	33.2 C (91.8 F)
2024	34.2 C (93.6 F)
2025	32.7 C (90.9 F)
2026	30.2 C (86.4 F)

Coldest night (TNn)

The coldest night of the year at Red Hill, 1978 to 2026. The record is -27.3 C (-17.1 F) in 1989, marked on the chart; the median year is -17.1 C (1.2 F).

Coldest night (TNn) at Red Hill by year
Year	Coldest night (TNn)
1978	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	-14.4 C (6.1 F)
1989	-27.3 C (-17.1 F)
1990	-25.0 C (-13.0 F)
1991	-14.4 C (6.1 F)
1992	-15.1 C (4.8 F)
1993	-18.2 C (-0.8 F)
1994	-17.1 C (1.2 F)
1995	-18.7 C (-1.7 F)
1996	-23.4 C (-10.1 F)
1997	-20.4 C (-4.7 F)
1998	-22.1 C (-7.8 F)
1999	-9.7 C (14.5 F)
2000	-12.7 C (9.1 F)
2001	-11.5 C (11.3 F)
2002	-14.3 C (6.3 F)
2003	-13.6 C (7.5 F)
2004	-21.6 C (-6.9 F)
2005	-15.4 C (4.3 F)
2006	-18.4 C (-1.1 F)
2007	-19.0 C (-2.2 F)
2008	-20.6 C (-5.1 F)
2009	-19.3 C (-2.7 F)
2010	-17.1 C (1.2 F)
2011	-18.3 C (-0.9 F)
2012	-12.6 C (9.3 F)
2013	-19.2 C (-2.6 F)
2014	-19.6 C (-3.3 F)
2015	-13.6 C (7.5 F)
2016	-15.3 C (4.5 F)
2017	-18.7 C (-1.7 F)
2018	-15.0 C (5.0 F)
2019	-16.5 C (2.3 F)
2020	-11.5 C (11.3 F)
2021	-17.0 C (1.4 F)
2022	-21.1 C (-6.0 F)
2023	-16.9 C (1.6 F)
2024	-23.8 C (-10.8 F)
2025	-16.6 C (2.1 F)
2026	-11.6 C (11.1 F)

Wettest day (Rx1day)

The wettest day of the year at Red Hill, 1978 to 2026. The record is 198.1 mm (7.8 in) in 2022, marked on the chart; the median year is 109.2 mm (4.3 in).

Wettest day (Rx1day) at Red Hill by year
Year	Wettest day (Rx1day)
1978	71.1 mm (2.8 in)
1979	78.7 mm (3.1 in)
1980	142.2 mm (5.6 in)
1981	81.3 mm (3.2 in)
1982	129.5 mm (5.1 in)
1983	99.1 mm (3.9 in)
1984	104.1 mm (4.1 in)
1985	144.8 mm (5.7 in)
1986	111.8 mm (4.4 in)
1987	116.8 mm (4.6 in)
1988	139.7 mm (5.5 in)
1989	124.5 mm (4.9 in)
1990	129.5 mm (5.1 in)
1991	104.1 mm (4.1 in)
1992	114.3 mm (4.5 in)
1993	68.6 mm (2.7 in)
1994	167.6 mm (6.6 in)
1995	121.9 mm (4.8 in)
1996	119.4 mm (4.7 in)
1997	144.8 mm (5.7 in)
1998	149.9 mm (5.9 in)
1999	170.2 mm (6.7 in)
2000	104.1 mm (4.1 in)
2001	76.2 mm (3.0 in)
2002	109.2 mm (4.3 in)
2003	73.7 mm (2.9 in)
2004	66.0 mm (2.6 in)
2005	94.0 mm (3.7 in)
2006	129.5 mm (5.1 in)
2007	81.3 mm (3.2 in)
2008	88.9 mm (3.5 in)
2009	152.4 mm (6.0 in)
2010	76.2 mm (3.0 in)
2011	137.2 mm (5.4 in)
2012	88.9 mm (3.5 in)
2013	129.5 mm (5.1 in)
2014	104.1 mm (4.1 in)
2015	129.5 mm (5.1 in)
2016	68.6 mm (2.7 in)
2017	116.8 mm (4.6 in)
2018	104.1 mm (4.1 in)
2019	99.1 mm (3.9 in)
2020	91.4 mm (3.6 in)
2021	134.6 mm (5.3 in)
2022	198.1 mm (7.8 in)
2023	96.5 mm (3.8 in)
2024	91.4 mm (3.6 in)
2025	167.6 mm (6.6 in)
2026	94.0 mm (3.7 in)

Wettest five days (Rx5day)

The wettest five days of the year at Red Hill, 1978 to 2026. The record is 393.7 mm (15.5 in) in 2006, marked on the chart; the median year is 266.7 mm (10.5 in).

Wettest five days (Rx5day) at Red Hill by year
Year	Wettest five days (Rx5day)
1978	155.0 mm (6.1 in)
1979	210.7 mm (8.3 in)
1980	365.7 mm (14.4 in)
1981	274.3 mm (10.8 in)
1982	317.5 mm (12.5 in)
1983	248.8 mm (9.8 in)
1984	233.7 mm (9.2 in)
1985	208.3 mm (8.2 in)
1986	226.0 mm (8.9 in)
1987	221.0 mm (8.7 in)
1988	289.6 mm (11.4 in)
1989	284.4 mm (11.2 in)
1990	307.3 mm (12.1 in)
1991	200.6 mm (7.9 in)
1992	208.4 mm (8.2 in)
1993	170.2 mm (6.7 in)
1994	350.5 mm (13.8 in)
1995	337.8 mm (13.3 in)
1996	368.2 mm (14.5 in)
1997	271.8 mm (10.7 in)
1998	363.3 mm (14.3 in)
1999	279.4 mm (11.0 in)
2000	203.2 mm (8.0 in)
2001	228.6 mm (9.0 in)
2002	299.7 mm (11.8 in)
2003	284.5 mm (11.2 in)
2004	183.0 mm (7.2 in)
2005	254.0 mm (10.0 in)
2006	393.7 mm (15.5 in)
2007	213.4 mm (8.4 in)
2008	304.8 mm (12.0 in)
2009	251.5 mm (9.9 in)
2010	215.9 mm (8.5 in)
2011	317.6 mm (12.5 in)
2012	325.1 mm (12.8 in)
2013	266.7 mm (10.5 in)
2014	205.8 mm (8.1 in)
2015	289.6 mm (11.4 in)
2016	182.9 mm (7.2 in)
2017	269.3 mm (10.6 in)
2018	170.1 mm (6.7 in)
2019	248.9 mm (9.8 in)
2020	231.1 mm (9.1 in)
2021	238.8 mm (9.4 in)
2022	299.7 mm (11.8 in)
2023	271.7 mm (10.7 in)
2024	205.7 mm (8.1 in)
2025	363.2 mm (14.3 in)
2026	274.3 mm (10.8 in)

Longest dry spell (CDD)

The longest dry spell of the year at Red Hill, 1978 to 2026. The record is 88 days in 1985, marked on the chart; the median year is 32 days.

Longest dry spell (CDD) at Red Hill by year
Year	Longest dry spell (CDD)
1978	26 days
1979	20 days
1980	13 days
1981	18 days
1982	19 days
1983	22 days
1984	52 days
1985	88 days
1986	34 days
1987	77 days
1988	33 days
1989	86 days
1990	51 days
1991	38 days
1992	22 days
1993	22 days
1994	18 days
1995	19 days
1996	40 days
1997	40 days
1998	82 days
1999	33 days
2000	81 days
2001	29 days
2002	27 days
2003	30 days
2004	53 days
2005	25 days
2006	29 days
2007	30 days
2008	40 days
2009	45 days
2010	13 days
2011	54 days
2012	51 days
2013	22 days
2014	24 days
2015	29 days
2016	51 days
2017	32 days
2018	50 days
2019	14 days
2020	18 days
2021	73 days
2022	60 days
2023	25 days
2024	24 days
2025	37 days
2026	55 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

35 years with a frost

Across 35 years with a frost, the median last spring frost at Red Hill falls on 10 June and the median first autumn frost on 2 October, which leaves a median of 117 days between them.

Fitted over all years, the growing season changes by +5.8 days per decade at this station.

Frost dates and growing season at Red Hill
Measure	Median, all years	Earliest period	Recent period (1994 to 2024)	Recent against earliest	Fitted trend
Last spring frost	10 June	n/a	9 June	n/a	-2.5 days per decade
First autumn frost	2 October	n/a	2 October	n/a	+3.2 days per decade
Growing days	117 days	n/a	122 days	n/a	+5.8 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

47 years, 1979 to 2025

A day with at least 111.4 mm (4.4 in) of rain is expected about once in 2 years. A day with at least 198.1 mm (7.8 in) of rain is expected about once in 100 years.

Rainfall return levels at Red Hill: the daily rain expected about once in a given number of years
Expected about once in	A day with at least	Note
2 years	111.4 mm (4.4 in)
5 years	139.4 mm (5.5 in)
10 years	155.8 mm (6.1 in)
25 years	174.5 mm (6.9 in)
50 years	186.9 mm (7.4 in)	Longer than the 47 years of record
100 years	198.1 mm (7.8 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 1979 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: 198.1 mm (7.8 in) in 2022; 170.2 mm (6.7 in) in 1999; 167.6 mm (6.6 in) in 1994.

Download the Data

Data for Red Hill standing records by year: CSV or JSON. Field meanings are on the data page.
Data for Red Hill 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).