Copper Hill Weather Records (USC00441999)

Record envelope, standing records and threshold days for Copper Hill (USC00441999), Virginia, United States, with 87 years of record.

Key Facts for Copper Hill

Copper Hill (USC00441999) is a weather station in Virginia, United States at 37.08 latitude and -80.14 longitude, 868 m (2,846 ft) above sea level.
The station reports from 1940 to 2026, 87 years of record.
1,464 records set at Copper Hill still stand.
Records are tracked for prcp, snow, snwd: an element needs 30 years of data to be eligible.
Copper Hill set a daily record precipitation of 113.0 mm (4.4 in) on 11 October 2026 (provisional).

Provisional Records

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

About the Station

Location: Virginia, United States, 37.08 latitude, -80.14 longitude.
Elevation: 868 m (2,846 ft).
Period of record: 1940 to 2026, 87 years.
Eligible elements: prcp, snow, snwd.

Daily Record Envelope and 2026

72 days at or beyond a record

The band shows the record high and record low for each calendar day at Copper Hill. The lines show the 2026 daily maximum and minimum. 72 days in 2026 matched or passed a record. Temperatures are in degrees Celsius.

Daily record high and record low at Copper Hill, with 2026 drawn through them
Month	Highest record high	Lowest record low	2026 highest maximum	2026 lowest minimum
Jan	20.0 C (68.0 F)	-22.2 C (-8.0 F)	15.6 C (60.1 F)	-17.2 C (1.0 F)
Feb	22.8 C (73.0 F)	-22.8 C (-9.0 F)	16.7 C (62.1 F)	-16.1 C (3.0 F)
Mar	26.1 C (79.0 F)	-14.4 C (6.1 F)	26.1 C (79.0 F)	-8.9 C (16.0 F)
Apr	28.9 C (84.0 F)	-7.8 C (18.0 F)	28.9 C (84.0 F)	-1.1 C (30.0 F)
May	30.6 C (87.1 F)	-3.3 C (26.1 F)	30.6 C (87.1 F)	-1.1 C (30.0 F)
Jun	33.9 C (93.0 F)	2.8 C (37.0 F)	31.1 C (88.0 F)	7.8 C (46.0 F)
Jul	32.8 C (91.0 F)	8.9 C (48.0 F)	32.8 C (91.0 F)	12.2 C (54.0 F)
Aug	32.2 C (90.0 F)	5.0 C (41.0 F)	29.4 C (84.9 F)	10.0 C (50.0 F)
Sep	31.1 C (88.0 F)	2.2 C (36.0 F)	31.7 C (89.1 F)	3.3 C (37.9 F)
Oct	30.0 C (86.0 F)	-5.0 C (23.0 F)	26.7 C (80.1 F)	6.7 C (44.1 F)
Nov	24.4 C (75.9 F)	-15.0 C (5.0 F)	n/a	n/a
Dec	20.6 C (69.1 F)	-25.6 C (-14.1 F)	n/a	n/a

Which Years Hold Standing Records

1,464 standing records

1,464 records at Copper Hill still stand. 2018 holds the most, with 118.

All-Time Record Progression

1 new records

1 all-time records were set at Copper Hill between 21 June 1972 and 21 June 1972. Each dot is a new record.

Wettest Day of Each Month

Jun: 206.2 mm (8.1 in)

The wettest day on record for each calendar month at Copper Hill. The most was 206.2 mm (8.1 in) on 21 June 1972.

Record daily precipitation for each month at Copper Hill
Month	Record daily precipitation (mm)	Date
Jan	88.6 mm (3.5 in)	15 January 1995
Feb	70.1 mm (2.8 in)	14 February 1984
Mar	83.6 mm (3.3 in)	13 March 1977
Apr	91.7 mm (3.6 in)	26 April 1978
May	89.9 mm (3.5 in)	28 May 1973
Jun	206.2 mm (8.1 in)	21 June 1972
Jul	121.4 mm (4.8 in)	15 July 1990
Aug	191.3 mm (7.5 in)	18 August 1985
Sep	160.3 mm (6.3 in)	28 September 2024
Oct	167.9 mm (6.6 in)	19 October 1968
Nov	148.1 mm (5.8 in)	5 November 1985
Dec	96.5 mm (3.8 in)	3 December 1948

Period of Record Coverage

2010 to 2026

17 years of record at Copper Hill, 2010 to 2026. 2 years have data for under 90 percent of days and are left out of rankings: 2010, 2026.

Days with data per year at Copper Hill
Year	Days with data	Share of year	Complete
2010	61	17%	No
2011	355	97%	Yes
2012	347	95%	Yes
2013	351	96%	Yes
2014	354	97%	Yes
2015	347	95%	Yes
2016	352	96%	Yes
2017	355	97%	Yes
2018	365	100%	Yes
2019	361	99%	Yes
2020	344	94%	Yes
2021	365	100%	Yes
2022	350	96%	Yes
2023	363	99%	Yes
2024	366	100%	Yes
2025	338	93%	Yes
2026	283	78%	No

Latest Records

Latest records at Copper Hill
Date	Station	Record	Value	Beat old record by	Old record stood	Significance
11 October 2026	Copper Hill, US	daily rain (Provisional)	113.0 mm (4.4 in)	10.9 mm (0.4 in)	36 years	23 of 100 (Routine)
4 October 2026	Copper Hill, US	daily rain (Provisional)	60.2 mm (2.4 in)	10.7 mm (0.4 in)	11 years	16 of 100 (Routine)
25 January 2026	Copper Hill, US	daily snowfall	7.6 cm (3.0 in)	3.8 cm (1.5 in)	39 years	24 of 100 (Routine)
11 January 2026	Copper Hill, US	daily rain	38.9 mm (1.5 in)	8.7 mm (0.34 in)	72 years	36 of 100 (Notable)
9 December 2025	Copper Hill, US	daily snow depth	20.3 cm (8.0 in)	7.6 cm (3.0 in)	48 years	32 of 100 (Routine)
9 December 2025	Copper Hill, US	daily snowfall	14.0 cm (5.5 in)	3.3 cm (1.3 in)	52 years	28 of 100 (Routine)
5 December 2025	Copper Hill, US	daily snowfall (Tie)	12.7 cm (5.0 in)	tie	22 years	3 of 100 (Routine)
13 May 2025	Copper Hill, US	daily rain	84.8 mm (3.3 in)	41.4 mm (1.6 in)	54 years	57 of 100 (Notable)
16 February 2025	Copper Hill, US	daily rain	44.7 mm (1.8 in)	12.7 mm (0.5 in)	9 years	22 of 100 (Routine)
1 February 2025	Copper Hill, US	daily rain	22.6 mm (0.9 in)	4.8 mm (0.19 in)	77 years	20 of 100 (Routine)
28 September 2024	Copper Hill, US	monthly rain	160.3 mm (6.3 in)	32.5 mm (1.3 in)	25 years	40 of 100 (Notable)
9 August 2024	Copper Hill, US	daily rain	99.8 mm (3.9 in)	48.5 mm (1.9 in)	54 years	51 of 100 (Notable)
12 April 2024	Copper Hill, US	daily rain	44.2 mm (1.7 in)	6.4 mm (0.25 in)	11 years	15 of 100 (Routine)
10 January 2024	Copper Hill, US	daily rain	53.1 mm (2.1 in)	22.6 mm (0.9 in)	70 years	49 of 100 (Notable)
27 December 2023	Copper Hill, US	daily rain	38.4 mm (1.5 in)	8.9 mm (0.35 in)	49 years	29 of 100 (Routine)
18 December 2023	Copper Hill, US	daily rain	23.1 mm (0.9 in)	5.3 mm (0.21 in)	8 years	14 of 100 (Routine)
10 December 2023	Copper Hill, US	daily rain	33.3 mm (1.3 in)	2.3 mm (0.09 in)	61 years	28 of 100 (Routine)
22 November 2023	Copper Hill, US	daily rain	33.0 mm (1.3 in)	5.1 mm (0.20 in)	77 years	34 of 100 (Routine)
20 June 2023	Copper Hill, US	daily rain	81.8 mm (3.2 in)	48.8 mm (1.9 in)	76 years	61 of 100 (Major)
30 May 2023	Copper Hill, US	daily rain	53.6 mm (2.1 in)	6.1 mm (0.24 in)	10 years	15 of 100 (Routine)

Climate Trend

12 complete years, 2011 to 2024

One stripe for each of 12 complete years at Copper Hill, 2011 to 2024. Blue stripes are years cooler than the station's own mean of 10.9 C (51.7 F); red stripes are warmer. The coolest year was 2013, at 9.7 C (49.5 F), and the warmest was 2016, at 11.6 C (52.9 F). The strongest colour marks a difference of 1.2 C (2.2 F).

Annual mean temperature at Copper Hill as warming stripes, 2011 to 2024
Year	Annual mean temperature	Difference from the station mean
2011	11.3 C	+0.36 C
2013	9.7 C	-1.18 C
2014	9.8 C	-1.12 C
2015	11.4 C	+0.47 C
2016	11.6 C	+0.70 C
2017	11.6 C	+0.63 C
2018	10.9 C	+0.01 C
2019	11.6 C	+0.66 C
2021	11.5 C	+0.58 C
2022	10.9 C	-0.02 C
2023	10.6 C	-0.32 C
2024	10.2 C	-0.75 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

1940 to 2026

Yearly extremes at Copper Hill: the record and the median year
Measure	Record	Year of the record	Median year	Years with a value
Hottest day (TXx)	33.9 C (93.0 F)	2012	31.1 C (88.0 F)	17
Coldest night (TNn)	-25.6 C (-14.1 F)	2022	-17.2 C (1.0 F)	17
Wettest day (Rx1day)	206.2 mm (8.1 in)	1972	83.6 mm (3.3 in)	87
Wettest five days (Rx5day)	372.9 mm (14.7 in)	1940	134.8 mm (5.3 in)	87
Longest dry spell (CDD)	50 days	2016	19 days	87

Hottest day (TXx)

The hottest day of the year at Copper Hill, 1940 to 2026. The record is 33.9 C (93.0 F) in 2012, marked on the chart; the median year is 31.1 C (88.0 F).

Hottest day (TXx) at Copper Hill by year
Year	Hottest day (TXx)
1940	n/a
1941	n/a
1942	n/a
1943	n/a
1944	n/a
1945	n/a
1946	n/a
1947	n/a
1948	n/a
1949	n/a
1950	n/a
1951	n/a
1952	n/a
1953	n/a
1954	n/a
1955	n/a
1956	n/a
1957	n/a
1958	n/a
1959	n/a
1960	n/a
1961	n/a
1962	n/a
1963	n/a
1964	n/a
1965	n/a
1966	n/a
1967	n/a
1968	n/a
1969	n/a
1970	n/a
1971	n/a
1972	n/a
1973	n/a
1974	n/a
1975	n/a
1976	n/a
1977	n/a
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	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	18.3 C (64.9 F)
2011	32.8 C (91.0 F)
2012	33.9 C (93.0 F)
2013	31.1 C (88.0 F)
2014	30.6 C (87.1 F)
2015	30.6 C (87.1 F)
2016	32.2 C (90.0 F)
2017	31.7 C (89.1 F)
2018	30.0 C (86.0 F)
2019	31.1 C (88.0 F)
2020	31.7 C (89.1 F)
2021	32.2 C (90.0 F)
2022	30.6 C (87.1 F)
2023	30.6 C (87.1 F)
2024	32.8 C (91.0 F)
2025	31.1 C (88.0 F)
2026	32.8 C (91.0 F)

Coldest night (TNn)

The coldest night of the year at Copper Hill, 1940 to 2026. The record is -25.6 C (-14.1 F) in 2022, marked on the chart; the median year is -17.2 C (1.0 F).

Coldest night (TNn) at Copper Hill by year
Year	Coldest night (TNn)
1940	n/a
1941	n/a
1942	n/a
1943	n/a
1944	n/a
1945	n/a
1946	n/a
1947	n/a
1948	n/a
1949	n/a
1950	n/a
1951	n/a
1952	n/a
1953	n/a
1954	n/a
1955	n/a
1956	n/a
1957	n/a
1958	n/a
1959	n/a
1960	n/a
1961	n/a
1962	n/a
1963	n/a
1964	n/a
1965	n/a
1966	n/a
1967	n/a
1968	n/a
1969	n/a
1970	n/a
1971	n/a
1972	n/a
1973	n/a
1974	n/a
1975	n/a
1976	n/a
1977	n/a
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	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	-16.1 C (3.0 F)
2011	-16.1 C (3.0 F)
2012	-12.8 C (9.0 F)
2013	-13.3 C (8.1 F)
2014	-22.2 C (-8.0 F)
2015	-22.8 C (-9.0 F)
2016	-17.2 C (1.0 F)
2017	-17.8 C (0.0 F)
2018	-20.6 C (-5.1 F)
2019	-20.6 C (-5.1 F)
2020	-15.6 C (3.9 F)
2021	-12.2 C (10.0 F)
2022	-25.6 C (-14.1 F)
2023	-15.0 C (5.0 F)
2024	-20.6 C (-5.1 F)
2025	-16.7 C (1.9 F)
2026	-17.2 C (1.0 F)

Wettest day (Rx1day)

The wettest day of the year at Copper Hill, 1940 to 2026. The record is 206.2 mm (8.1 in) in 1972, marked on the chart; the median year is 83.6 mm (3.3 in).

Wettest day (Rx1day) at Copper Hill by year
Year	Wettest day (Rx1day)
1940	170.2 mm (6.7 in)
1941	55.9 mm (2.2 in)
1942	66.0 mm (2.6 in)
1943	58.4 mm (2.3 in)
1944	73.7 mm (2.9 in)
1945	113.3 mm (4.5 in)
1946	76.2 mm (3.0 in)
1947	50.8 mm (2.0 in)
1948	96.5 mm (3.8 in)
1949	127.0 mm (5.0 in)
1950	78.0 mm (3.1 in)
1951	72.1 mm (2.8 in)
1952	91.4 mm (3.6 in)
1953	68.6 mm (2.7 in)
1954	125.7 mm (4.9 in)
1955	85.3 mm (3.4 in)
1956	106.7 mm (4.2 in)
1957	60.7 mm (2.4 in)
1958	88.1 mm (3.5 in)
1959	71.1 mm (2.8 in)
1960	51.1 mm (2.0 in)
1961	49.8 mm (2.0 in)
1962	117.9 mm (4.6 in)
1963	38.9 mm (1.5 in)
1964	89.4 mm (3.5 in)
1965	57.4 mm (2.3 in)
1966	78.5 mm (3.1 in)
1967	55.9 mm (2.2 in)
1968	167.9 mm (6.6 in)
1969	72.6 mm (2.9 in)
1970	119.6 mm (4.7 in)
1971	56.9 mm (2.2 in)
1972	206.2 mm (8.1 in)
1973	89.9 mm (3.5 in)
1974	68.6 mm (2.7 in)
1975	89.9 mm (3.5 in)
1976	87.1 mm (3.4 in)
1977	83.6 mm (3.3 in)
1978	91.7 mm (3.6 in)
1979	122.4 mm (4.8 in)
1980	53.6 mm (2.1 in)
1981	69.1 mm (2.7 in)
1982	38.1 mm (1.5 in)
1983	96.0 mm (3.8 in)
1984	70.1 mm (2.8 in)
1985	191.3 mm (7.5 in)
1986	78.7 mm (3.1 in)
1987	119.9 mm (4.7 in)
1988	76.2 mm (3.0 in)
1989	75.7 mm (3.0 in)
1990	121.4 mm (4.8 in)
1991	42.9 mm (1.7 in)
1992	146.6 mm (5.8 in)
1993	66.8 mm (2.6 in)
1994	101.3 mm (4.0 in)
1995	88.6 mm (3.5 in)
1996	74.2 mm (2.9 in)
1997	37.1 mm (1.5 in)
1998	58.4 mm (2.3 in)
1999	127.8 mm (5.0 in)
2000	52.1 mm (2.1 in)
2001	57.2 mm (2.3 in)
2002	62.7 mm (2.5 in)
2003	68.1 mm (2.7 in)
2004	127.3 mm (5.0 in)
2005	96.8 mm (3.8 in)
2006	96.8 mm (3.8 in)
2007	51.3 mm (2.0 in)
2008	52.1 mm (2.1 in)
2009	86.6 mm (3.4 in)
2010	87.6 mm (3.4 in)
2011	117.6 mm (4.6 in)
2012	47.5 mm (1.9 in)
2013	111.0 mm (4.4 in)
2014	71.1 mm (2.8 in)
2015	79.2 mm (3.1 in)
2016	105.9 mm (4.2 in)
2017	86.6 mm (3.4 in)
2018	117.1 mm (4.6 in)
2019	119.1 mm (4.7 in)
2020	97.5 mm (3.8 in)
2021	86.6 mm (3.4 in)
2022	75.2 mm (3.0 in)
2023	81.8 mm (3.2 in)
2024	160.3 mm (6.3 in)
2025	84.8 mm (3.3 in)
2026	113.0 mm (4.4 in)

Wettest five days (Rx5day)

The wettest five days of the year at Copper Hill, 1940 to 2026. The record is 372.9 mm (14.7 in) in 1940, marked on the chart; the median year is 134.8 mm (5.3 in).

Wettest five days (Rx5day) at Copper Hill by year
Year	Wettest five days (Rx5day)
1940	372.9 mm (14.7 in)
1941	61.5 mm (2.4 in)
1942	118.1 mm (4.6 in)
1943	101.0 mm (4.0 in)
1944	114.3 mm (4.5 in)
1945	245.1 mm (9.6 in)
1946	109.2 mm (4.3 in)
1947	109.6 mm (4.3 in)
1948	162.6 mm (6.4 in)
1949	223.3 mm (8.8 in)
1950	135.6 mm (5.3 in)
1951	118.8 mm (4.7 in)
1952	147.6 mm (5.8 in)
1953	85.6 mm (3.4 in)
1954	154.9 mm (6.1 in)
1955	122.4 mm (4.8 in)
1956	129.3 mm (5.1 in)
1957	134.9 mm (5.3 in)
1958	113.5 mm (4.5 in)
1959	136.4 mm (5.4 in)
1960	116.1 mm (4.6 in)
1961	99.1 mm (3.9 in)
1962	124.0 mm (4.9 in)
1963	51.6 mm (2.0 in)
1964	124.5 mm (4.9 in)
1965	79.5 mm (3.1 in)
1966	84.9 mm (3.3 in)
1967	126.6 mm (5.0 in)
1968	214.9 mm (8.5 in)
1969	102.9 mm (4.1 in)
1970	214.0 mm (8.4 in)
1971	178.3 mm (7.0 in)
1972	307.6 mm (12.1 in)
1973	161.3 mm (6.4 in)
1974	109.3 mm (4.3 in)
1975	136.1 mm (5.4 in)
1976	172.2 mm (6.8 in)
1977	225.0 mm (8.9 in)
1978	154.9 mm (6.1 in)
1979	180.3 mm (7.1 in)
1980	89.1 mm (3.5 in)
1981	85.7 mm (3.4 in)
1982	68.2 mm (2.7 in)
1983	125.2 mm (4.9 in)
1984	72.0 mm (2.8 in)
1985	298.0 mm (11.7 in)
1986	164.0 mm (6.5 in)
1987	198.1 mm (7.8 in)
1988	122.5 mm (4.8 in)
1989	143.8 mm (5.7 in)
1990	231.3 mm (9.1 in)
1991	63.2 mm (2.5 in)
1992	168.7 mm (6.6 in)
1993	93.1 mm (3.7 in)
1994	171.9 mm (6.8 in)
1995	150.0 mm (5.9 in)
1996	137.4 mm (5.4 in)
1997	83.8 mm (3.3 in)
1998	86.6 mm (3.4 in)
1999	193.6 mm (7.6 in)
2000	103.6 mm (4.1 in)
2001	96.3 mm (3.8 in)
2002	71.3 mm (2.8 in)
2003	100.8 mm (4.0 in)
2004	213.2 mm (8.4 in)
2005	192.6 mm (7.6 in)
2006	205.4 mm (8.1 in)
2007	116.6 mm (4.6 in)
2008	106.0 mm (4.2 in)
2009	134.8 mm (5.3 in)
2010	152.7 mm (6.0 in)
2011	167.4 mm (6.6 in)
2012	65.8 mm (2.6 in)
2013	149.2 mm (5.9 in)
2014	96.4 mm (3.8 in)
2015	286.4 mm (11.3 in)
2016	136.7 mm (5.4 in)
2017	120.4 mm (4.7 in)
2018	171.2 mm (6.7 in)
2019	215.6 mm (8.5 in)
2020	229.7 mm (9.0 in)
2021	116.9 mm (4.6 in)
2022	99.1 mm (3.9 in)
2023	160.6 mm (6.3 in)
2024	182.4 mm (7.2 in)
2025	150.6 mm (5.9 in)
2026	114.8 mm (4.5 in)

Longest dry spell (CDD)

The longest dry spell of the year at Copper Hill, 1940 to 2026. The record is 50 days in 2016, marked on the chart; the median year is 19 days.

Longest dry spell (CDD) at Copper Hill by year
Year	Longest dry spell (CDD)
1940	14 days
1941	20 days
1942	26 days
1943	27 days
1944	18 days
1945	17 days
1946	21 days
1947	17 days
1948	22 days
1949	20 days
1950	19 days
1951	17 days
1952	29 days
1953	30 days
1954	30 days
1955	19 days
1956	18 days
1957	18 days
1958	25 days
1959	20 days
1960	17 days
1961	16 days
1962	16 days
1963	23 days
1964	32 days
1965	28 days
1966	21 days
1967	21 days
1968	34 days
1969	23 days
1970	30 days
1971	23 days
1972	24 days
1973	24 days
1974	17 days
1975	20 days
1976	20 days
1977	16 days
1978	20 days
1979	17 days
1980	22 days
1981	21 days
1982	19 days
1983	21 days
1984	24 days
1985	19 days
1986	22 days
1987	20 days
1988	16 days
1989	14 days
1990	22 days
1991	33 days
1992	17 days
1993	17 days
1994	15 days
1995	19 days
1996	16 days
1997	19 days
1998	18 days
1999	14 days
2000	42 days
2001	41 days
2002	18 days
2003	10 days
2004	13 days
2005	25 days
2006	12 days
2007	15 days
2008	13 days
2009	13 days
2010	17 days
2011	14 days
2012	13 days
2013	13 days
2014	15 days
2015	15 days
2016	50 days
2017	16 days
2018	9 days
2019	15 days
2020	24 days
2021	15 days
2022	12 days
2023	16 days
2024	25 days
2025	12 days
2026	14 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

76 years, 1942 to 2025

A day with at least 81.5 mm (3.2 in) of rain is expected about once in 2 years. A day with at least 189.3 mm (7.5 in) of rain is expected about once in 100 years.

Rainfall return levels at Copper 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	81.5 mm (3.2 in)
5 years	110.1 mm (4.3 in)
10 years	129.1 mm (5.1 in)
25 years	153.3 mm (6.0 in)
50 years	171.3 mm (6.7 in)
100 years	189.3 mm (7.5 in)	Longer than the 76 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, 76 years of values from 1942 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: 206.2 mm (8.1 in) in 1972; 191.3 mm (7.5 in) in 1985; 160.3 mm (6.3 in) in 2024.

Download the Data

Data for Copper Hill standing records by year: CSV or JSON. Field meanings are on the data page.
Data for Copper 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 2026-10-14 (14 October 2026). Records are computed by this site and are not official.

Data as of 2026-10-14. Last revised 14 October 2026 (2026-10-14).