O O Rch Weather Records (USC00356302)

Record envelope, standing records and threshold days for O O Rch (USC00356302), Oregon, United States, with 71 years of record.

Key Facts for O O Rch

O O Rch (USC00356302) is a weather station in Oregon, United States at 43.28 latitude and -119.31 longitude, 1,261 m (4,136 ft) above sea level.
The station reports from 1941 to 2011, 71 years of record.
1,464 records set at O O Rch still stand.
Records are tracked for tmax, tmin, prcp, snow, snwd: an element needs 30 years of data to be eligible.
O O Rch set a daily record high minimum temperature of 10.0 C (50.0 F) on 11 May 2011.

About the Station

Location: Oregon, United States, 43.28 latitude, -119.31 longitude.
Elevation: 1,261 m (4,136 ft).
Period of record: 1941 to 2011, 71 years.
Eligible elements: tmax, tmin, prcp, snow, snwd.

Daily Record Envelope and 2026

0 days at or beyond a record

The band shows the record high and record low for each calendar day at O O Rch. The lines show the 2026 daily maximum and minimum. 0 days in 2026 matched or passed a record. Temperatures are in degrees Celsius.

Daily record high and record low at O O Rch, with 2026 drawn through them
Month	Highest record high	Lowest record low	2026 highest maximum	2026 lowest minimum
Jan	17.8 C (64.0 F)	-37.8 C (-36.0 F)	n/a	n/a
Feb	20.6 C (69.1 F)	-27.8 C (-18.0 F)	n/a	n/a
Mar	25.6 C (78.1 F)	-21.7 C (-7.1 F)	n/a	n/a
Apr	32.2 C (90.0 F)	-11.1 C (12.0 F)	n/a	n/a
May	33.9 C (93.0 F)	-11.1 C (12.0 F)	n/a	n/a
Jun	37.8 C (100.0 F)	-4.4 C (24.1 F)	n/a	n/a
Jul	39.4 C (102.9 F)	-3.3 C (26.1 F)	n/a	n/a
Aug	38.9 C (102.0 F)	-5.0 C (23.0 F)	n/a	n/a
Sep	37.2 C (99.0 F)	-11.7 C (10.9 F)	n/a	n/a
Oct	33.3 C (91.9 F)	-18.3 C (-0.9 F)	n/a	n/a
Nov	26.7 C (80.1 F)	-26.7 C (-16.1 F)	n/a	n/a
Dec	17.8 C (64.0 F)	-37.2 C (-35.0 F)	n/a	n/a

Which Years Hold Standing Records

1,464 standing records

1,464 records at O O Rch still stand. 1972 holds the most, with 65.

Standing records at O O Rch by the year they were set
Year set	Standing records
1955	24
1956	47
1957	23
1958	16
1959	30
1960	39
1961	33
1962	30
1963	37
1964	17
1965	28
1966	44
1967	32
1968	43
1969	38
1970	43
1971	41
1972	65
1973	24
1974	39
1975	37
1976	21
1977	12
1978	27
1979	28
1980	24
1981	19
1982	42
1983	16
1984	22
1986	25
1987	3
1989	22
1990	41
1991	20
1992	22
1993	38
1994	24
1995	25
1996	28
1997	7
1998	32
1999	23
2000	24
2001	17
2002	32
2003	23
2004	5
2005	15
2006	14
2007	9
2008	44
2009	12
2010	15
2011	3

All-Time Record Progression

2 new records

2 all-time records were set at O O Rch between 31 August 1984 and 9 July 1999. Each dot is a new record.

When O O Rch set new all-time records
Date	Kind	Detail
1984-08-31	Record daily precipitation	Record daily precipitation 51.3 mm (2.0 in)
1999-07-09	Record high minimum temperature	Record high minimum temperature 21.1 C (70.0 F)

Wettest Day of Each Month

Aug: 51.3 mm (2.0 in)

The wettest day on record for each calendar month at O O Rch. The most was 51.3 mm (2.0 in) on 31 August 1984.

Record daily precipitation for each month at O O Rch
Month	Record daily precipitation (mm)	Date
Jan	26.7 mm (1.1 in)	26 January 1997
Feb	16.5 mm (0.6 in)	12 February 2000
Mar	37.8 mm (1.5 in)	31 March 1995
Apr	25.7 mm (1.0 in)	28 April 1951
May	47.5 mm (1.9 in)	31 May 1996
Jun	23.4 mm (0.9 in)	28 June 1955
Jul	22.6 mm (0.9 in)	30 July 1980
Aug	51.3 mm (2.0 in)	31 August 1984
Sep	40.6 mm (1.6 in)	1 September 2000
Oct	33.0 mm (1.3 in)	10 October 1962
Nov	25.9 mm (1.0 in)	29 November 1951
Dec	30.5 mm (1.2 in)	8 December 2004

Period of Record Coverage

1955 to 2011

55 years of record at O O Rch, 1955 to 2011. 40 years have data for under 90 percent of days and are left out of rankings: 1955, 1957, 1963, 1964, 1965, 1972, 1973, 1974 and others.

Days with data per year at O O Rch
Year	Days with data	Share of year	Complete
1955	57	16%	No
1956	349	95%	Yes
1957	322	88%	No
1958	356	98%	Yes
1959	359	98%	Yes
1960	342	93%	Yes
1961	336	92%	Yes
1962	340	93%	Yes
1963	320	88%	No
1964	263	72%	No
1965	253	69%	No
1966	335	92%	Yes
1967	341	93%	Yes
1968	330	90%	Yes
1969	340	93%	Yes
1970	342	94%	Yes
1971	336	92%	Yes
1972	326	89%	No
1973	308	84%	No
1974	277	76%	No
1975	222	61%	No
1976	205	56%	No
1977	116	32%	No
1978	337	92%	Yes
1979	312	85%	No
1980	336	92%	Yes
1981	330	90%	Yes
1982	322	88%	No
1983	201	55%	No
1984	186	51%	No
1986	149	41%	No
1987	95	26%	No
1989	253	69%	No
1990	312	85%	No
1991	306	84%	No
1992	315	86%	No
1993	322	88%	No
1994	319	87%	No
1995	269	74%	No
1996	250	68%	No
1997	286	78%	No
1998	312	85%	No
1999	285	78%	No
2000	300	82%	No
2001	309	85%	No
2002	310	85%	No
2003	323	88%	No
2004	323	88%	No
2005	287	79%	No
2006	262	72%	No
2007	319	87%	No
2008	279	76%	No
2009	153	42%	No
2010	226	62%	No
2011	97	27%	No

Latest Records

Latest records at O O Rch
Date	Station	Record	Value	Beat old record by	Old record stood	Significance
11 May 2011	O O Rch, US	daily high min	10.0 C (50.0 F)	3.3 C (5.9 F)	16 years	18 of 100 (Routine)
30 March 2011	O O Rch, US	daily high min	5.6 C (42.1 F)	1.2 C (2.2 F)	0 years	8 of 100 (Routine)
15 March 2011	O O Rch, US	daily high min	4.4 C (39.9 F)	0.5 C (0.9 F)	32 years	15 of 100 (Routine)
13 December 2010	O O Rch, US	daily high min (Tie)	3.3 C (37.9 F)	tie	53 years	5 of 100 (Routine)
13 December 2010	O O Rch, US	daily rain (Tie)	6.4 mm (0.25 in)	tie	53 years	5 of 100 (Routine)
12 December 2010	O O Rch, US	daily high max	12.8 C (55.0 F)	0.6 C (1.1 F)	8 years	8 of 100 (Routine)
29 November 2010	O O Rch, US	daily low min	-17.8 C (0.0 F)	2.8 C (5.0 F)	8 years	12 of 100 (Routine)
24 November 2010	O O Rch, US	daily low max	-6.7 C (19.9 F)	4.5 C (8.1 F)	28 years	21 of 100 (Routine)
14 November 2010	O O Rch, US	daily high max	21.7 C (71.1 F)	3.9 C (7.0 F)	15 years	16 of 100 (Routine)
2 November 2010	O O Rch, US	daily high max	19.4 C (66.9 F)	0.5 C (0.9 F)	48 years	19 of 100 (Routine)
11 October 2010	O O Rch, US	monthly high max	33.3 C (91.9 F)	1.6 C (2.9 F)	45 years	30 of 100 (Routine)
27 September 2010	O O Rch, US	daily high max (Tie)	31.7 C (89.1 F)	tie	47 years	4 of 100 (Routine)
26 September 2010	O O Rch, US	daily high max (Tie)	32.2 C (90.0 F)	tie	47 years	4 of 100 (Routine)
10 September 2010	O O Rch, US	daily low max	14.4 C (57.9 F)	4.5 C (8.1 F)	37 years	25 of 100 (Routine)
10 September 2010	O O Rch, US	daily low min (Tie)	-1.7 C (28.9 F)	tie	20 years	2 of 100 (Routine)
7 September 2010	O O Rch, US	daily low min	-2.8 C (27.0 F)	1.7 C (3.1 F)	39 years	20 of 100 (Routine)
7 September 2010	O O Rch, US	daily high max	33.3 C (91.9 F)	1.1 C (2.0 F)	31 years	16 of 100 (Routine)
11 August 2010	O O Rch, US	daily low max	23.3 C (73.9 F)	0.6 C (1.1 F)	15 years	10 of 100 (Routine)
6 August 2010	O O Rch, US	daily high min	18.3 C (64.9 F)	4.4 C (7.9 F)	47 years	32 of 100 (Routine)
14 July 2010	O O Rch, US	daily low min	2.2 C (36.0 F)	1.1 C (2.0 F)	16 years	13 of 100 (Routine)

Climate Trend

23 complete years, 1956 to 2007

One stripe for each of 23 complete years at O O Rch, 1956 to 2007. Blue stripes are years cooler than the station's own mean of 8.4 C (47.0 F); red stripes are warmer. The coolest year was 1993, at 6.7 C (44.0 F), and the warmest was 2003, at 9.7 C (49.4 F). The strongest colour marks a difference of 1.7 C (3.1 F).

Annual mean temperature at O O Rch as warming stripes, 1956 to 2007
Year	Annual mean temperature	Difference from the station mean
1956	7.1 C	-1.26 C
1958	9.3 C	+0.96 C
1959	8.5 C	+0.15 C
1960	7.9 C	-0.45 C
1961	8.5 C	+0.16 C
1966	8.2 C	-0.19 C
1967	8.4 C	+0.08 C
1968	9.2 C	+0.82 C
1969	8.9 C	+0.53 C
1971	8.3 C	-0.03 C
1972	8.0 C	-0.37 C
1978	7.8 C	-0.57 C
1990	8.6 C	+0.24 C
1992	9.2 C	+0.87 C
1993	6.7 C	-1.67 C
1994	8.4 C	+0.09 C
1998	8.2 C	-0.12 C
2000	8.7 C	+0.36 C
2001	8.1 C	-0.30 C
2002	8.3 C	-0.08 C
2003	9.7 C	+1.30 C
2004	8.3 C	-0.02 C
2007	7.9 C	-0.41 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

1941 to 2011

Yearly extremes at O O Rch: the record and the median year
Measure	Record	Year of the record	Median year	Years with a value
Hottest day (TXx)	39.4 C (102.9 F)	1968	35.6 C (96.1 F)	55
Coldest night (TNn)	-37.8 C (-36.0 F)	1962	-21.1 C (-6.0 F)	55
Wettest day (Rx1day)	51.3 mm (2.0 in)	1984	18.3 mm (0.7 in)	62
Wettest five days (Rx5day)	61.8 mm (2.4 in)	1991	29.7 mm (1.2 in)	61
Longest dry spell (CDD)	160 days	2002	50 days	62

Hottest day (TXx)

The hottest day of the year at O O Rch, 1941 to 2011. The record is 39.4 C (102.9 F) in 1968, marked on the chart; the median year is 35.6 C (96.1 F).

Hottest day (TXx) at O O Rch by year
Year	Hottest day (TXx)
1941	n/a
1942	n/a
1950	n/a
1951	n/a
1952	n/a
1953	n/a
1954	n/a
1955	18.3 C (64.9 F)
1956	35.0 C (95.0 F)
1957	33.3 C (91.9 F)
1958	35.0 C (95.0 F)
1959	37.2 C (99.0 F)
1960	37.8 C (100.0 F)
1961	38.9 C (102.0 F)
1962	34.4 C (93.9 F)
1963	33.3 C (91.9 F)
1964	34.4 C (93.9 F)
1965	33.9 C (93.0 F)
1966	35.6 C (96.1 F)
1967	37.8 C (100.0 F)
1968	39.4 C (102.9 F)
1969	37.2 C (99.0 F)
1970	36.1 C (97.0 F)
1971	36.1 C (97.0 F)
1972	37.8 C (100.0 F)
1973	35.6 C (96.1 F)
1974	35.6 C (96.1 F)
1975	35.0 C (95.0 F)
1976	33.9 C (93.0 F)
1977	29.4 C (84.9 F)
1978	35.6 C (96.1 F)
1979	36.7 C (98.1 F)
1980	36.1 C (97.0 F)
1981	35.6 C (96.1 F)
1982	34.4 C (93.9 F)
1983	33.9 C (93.0 F)
1984	34.4 C (93.9 F)
1986	33.9 C (93.0 F)
1987	28.3 C (82.9 F)
1989	35.0 C (95.0 F)
1990	37.8 C (100.0 F)
1991	34.4 C (93.9 F)
1992	36.7 C (98.1 F)
1993	33.3 C (91.9 F)
1994	35.0 C (95.0 F)
1995	34.4 C (93.9 F)
1996	35.6 C (96.1 F)
1997	34.4 C (93.9 F)
1998	37.2 C (99.0 F)
1999	35.6 C (96.1 F)
2000	35.6 C (96.1 F)
2001	37.8 C (100.0 F)
2002	38.9 C (102.0 F)
2003	38.3 C (100.9 F)
2004	35.6 C (96.1 F)
2005	37.2 C (99.0 F)
2006	37.8 C (100.0 F)
2007	37.2 C (99.0 F)
2008	35.0 C (95.0 F)
2009	37.8 C (100.0 F)
2010	35.0 C (95.0 F)
2011	31.7 C (89.1 F)

Coldest night (TNn)

The coldest night of the year at O O Rch, 1941 to 2011. The record is -37.8 C (-36.0 F) in 1962, marked on the chart; the median year is -21.1 C (-6.0 F).

Coldest night (TNn) at O O Rch by year
Year	Coldest night (TNn)
1941	n/a
1942	n/a
1950	n/a
1951	n/a
1952	n/a
1953	n/a
1954	n/a
1955	-26.7 C (-16.1 F)
1956	-27.8 C (-18.0 F)
1957	-33.9 C (-29.0 F)
1958	-15.6 C (3.9 F)
1959	-17.8 C (0.0 F)
1960	-26.1 C (-15.0 F)
1961	-23.3 C (-9.9 F)
1962	-37.8 C (-36.0 F)
1963	-23.9 C (-11.0 F)
1964	-16.1 C (3.0 F)
1965	-26.1 C (-15.0 F)
1966	-19.4 C (-2.9 F)
1967	-23.3 C (-9.9 F)
1968	-18.3 C (-0.9 F)
1969	-17.8 C (0.0 F)
1970	-23.3 C (-9.9 F)
1971	-22.2 C (-8.0 F)
1972	-37.2 C (-35.0 F)
1973	-16.7 C (1.9 F)
1974	-25.0 C (-13.0 F)
1975	-22.2 C (-8.0 F)
1976	-21.7 C (-7.1 F)
1977	-21.1 C (-6.0 F)
1978	-22.2 C (-8.0 F)
1979	-27.2 C (-17.0 F)
1980	-27.2 C (-17.0 F)
1981	-19.4 C (-2.9 F)
1982	-27.2 C (-17.0 F)
1983	-21.7 C (-7.1 F)
1984	-7.8 C (18.0 F)
1986	-12.2 C (10.0 F)
1987	-17.2 C (1.0 F)
1989	-15.0 C (5.0 F)
1990	-28.9 C (-20.0 F)
1991	-21.1 C (-6.0 F)
1992	-18.3 C (-0.9 F)
1993	-25.0 C (-13.0 F)
1994	-17.8 C (0.0 F)
1995	-15.6 C (3.9 F)
1996	-20.6 C (-5.1 F)
1997	-16.7 C (1.9 F)
1998	-23.9 C (-11.0 F)
1999	-20.0 C (-4.0 F)
2000	-14.4 C (6.1 F)
2001	-17.8 C (0.0 F)
2002	-18.9 C (-2.0 F)
2003	-16.7 C (1.9 F)
2004	-16.7 C (1.9 F)
2005	-21.1 C (-6.0 F)
2006	-20.0 C (-4.0 F)
2007	-16.7 C (1.9 F)
2008	-23.9 C (-11.0 F)
2009	-22.2 C (-8.0 F)
2010	-17.8 C (0.0 F)
2011	-21.7 C (-7.1 F)

Wettest day (Rx1day)

The wettest day of the year at O O Rch, 1941 to 2011. The record is 51.3 mm (2.0 in) in 1984, marked on the chart; the median year is 18.3 mm (0.7 in).

Wettest day (Rx1day) at O O Rch by year
Year	Wettest day (Rx1day)
1941	8.1 mm (0.32 in)
1942	13.2 mm (0.5 in)
1950	25.4 mm (1.0 in)
1951	25.9 mm (1.0 in)
1952	11.4 mm (0.4 in)
1953	11.4 mm (0.4 in)
1954	12.2 mm (0.5 in)
1955	23.4 mm (0.9 in)
1956	14.2 mm (0.6 in)
1957	12.7 mm (0.5 in)
1958	12.7 mm (0.5 in)
1959	12.7 mm (0.5 in)
1960	13.2 mm (0.5 in)
1961	12.7 mm (0.5 in)
1962	33.0 mm (1.3 in)
1963	15.7 mm (0.6 in)
1964	19.1 mm (0.8 in)
1965	18.3 mm (0.7 in)
1966	30.0 mm (1.2 in)
1967	18.3 mm (0.7 in)
1968	18.3 mm (0.7 in)
1969	23.4 mm (0.9 in)
1970	20.8 mm (0.8 in)
1971	24.9 mm (1.0 in)
1972	10.7 mm (0.4 in)
1973	17.8 mm (0.7 in)
1974	10.9 mm (0.4 in)
1975	21.8 mm (0.9 in)
1976	31.8 mm (1.3 in)
1977	12.7 mm (0.5 in)
1978	25.4 mm (1.0 in)
1979	21.8 mm (0.9 in)
1980	22.6 mm (0.9 in)
1981	25.9 mm (1.0 in)
1982	13.2 mm (0.5 in)
1983	17.8 mm (0.7 in)
1984	51.3 mm (2.0 in)
1986	12.2 mm (0.5 in)
1987	11.7 mm (0.5 in)
1989	21.1 mm (0.8 in)
1990	8.1 mm (0.32 in)
1991	45.7 mm (1.8 in)
1992	17.0 mm (0.7 in)
1993	18.5 mm (0.7 in)
1994	16.0 mm (0.6 in)
1995	37.8 mm (1.5 in)
1996	47.5 mm (1.9 in)
1997	26.7 mm (1.1 in)
1998	25.4 mm (1.0 in)
1999	16.5 mm (0.6 in)
2000	40.6 mm (1.6 in)
2001	15.2 mm (0.6 in)
2002	12.7 mm (0.5 in)
2003	19.1 mm (0.8 in)
2004	30.5 mm (1.2 in)
2005	30.5 mm (1.2 in)
2006	27.9 mm (1.1 in)
2007	21.6 mm (0.9 in)
2008	12.7 mm (0.5 in)
2009	16.0 mm (0.6 in)
2010	8.9 mm (0.35 in)
2011	6.9 mm (0.27 in)

Wettest five days (Rx5day)

The wettest five days of the year at O O Rch, 1941 to 2011. The record is 61.8 mm (2.4 in) in 1991, marked on the chart; the median year is 29.7 mm (1.2 in).

Wettest five days (Rx5day) at O O Rch by year
Year	Wettest five days (Rx5day)
1941	17.0 mm (0.7 in)
1942	29.7 mm (1.2 in)
1950	34.0 mm (1.3 in)
1951	34.0 mm (1.3 in)
1952	23.1 mm (0.9 in)
1953	18.6 mm (0.7 in)
1954	22.1 mm (0.9 in)
1955	23.4 mm (0.9 in)
1956	27.7 mm (1.1 in)
1957	33.0 mm (1.3 in)
1958	31.4 mm (1.2 in)
1959	18.6 mm (0.7 in)
1960	18.8 mm (0.7 in)
1961	14.0 mm (0.6 in)
1962	61.7 mm (2.4 in)
1963	26.2 mm (1.0 in)
1964	43.2 mm (1.7 in)
1965	35.5 mm (1.4 in)
1966	33.3 mm (1.3 in)
1967	28.2 mm (1.1 in)
1968	33.8 mm (1.3 in)
1969	37.1 mm (1.5 in)
1970	35.2 mm (1.4 in)
1971	32.2 mm (1.3 in)
1972	15.0 mm (0.6 in)
1973	17.8 mm (0.7 in)
1974	16.0 mm (0.6 in)
1975	23.1 mm (0.9 in)
1976	58.1 mm (2.3 in)
1977	29.5 mm (1.2 in)
1978	33.3 mm (1.3 in)
1979	37.3 mm (1.5 in)
1980	23.4 mm (0.9 in)
1981	39.1 mm (1.5 in)
1982	30.3 mm (1.2 in)
1983	24.9 mm (1.0 in)
1984	51.6 mm (2.0 in)
1986	19.1 mm (0.8 in)
1987	13.7 mm (0.5 in)
1989	22.9 mm (0.9 in)
1990	17.9 mm (0.7 in)
1991	61.8 mm (2.4 in)
1992	33.8 mm (1.3 in)
1993	35.8 mm (1.4 in)
1994	23.6 mm (0.9 in)
1995	37.8 mm (1.5 in)
1996	47.5 mm (1.9 in)
1997	42.0 mm (1.7 in)
1998	44.5 mm (1.8 in)
1999	24.1 mm (0.9 in)
2000	45.7 mm (1.8 in)
2001	22.9 mm (0.9 in)
2002	21.6 mm (0.9 in)
2003	29.7 mm (1.2 in)
2004	30.5 mm (1.2 in)
2005	45.8 mm (1.8 in)
2006	27.9 mm (1.1 in)
2007	31.0 mm (1.2 in)
2008	29.2 mm (1.1 in)
2009	19.6 mm (0.8 in)
2010	18.8 mm (0.7 in)
2011	n/a

Longest dry spell (CDD)

The longest dry spell of the year at O O Rch, 1941 to 2011. The record is 160 days in 2002, marked on the chart; the median year is 50 days.

Longest dry spell (CDD) at O O Rch by year
Year	Longest dry spell (CDD)
1941	16 days
1942	34 days
1950	73 days
1951	107 days
1952	72 days
1953	70 days
1954	53 days
1955	49 days
1956	87 days
1957	101 days
1958	42 days
1959	93 days
1960	62 days
1961	38 days
1962	120 days
1963	31 days
1964	29 days
1965	50 days
1966	49 days
1967	39 days
1968	47 days
1969	47 days
1970	49 days
1971	29 days
1972	47 days
1973	31 days
1974	69 days
1975	54 days
1976	47 days
1977	61 days
1978	62 days
1979	52 days
1980	44 days
1981	44 days
1982	28 days
1983	25 days
1984	31 days
1986	29 days
1987	25 days
1989	31 days
1990	42 days
1991	30 days
1992	27 days
1993	55 days
1994	67 days
1995	33 days
1996	48 days
1997	50 days
1998	39 days
1999	57 days
2000	84 days
2001	86 days
2002	160 days
2003	73 days
2004	60 days
2005	75 days
2006	70 days
2007	55 days
2008	65 days
2009	53 days
2010	50 days
2011	4 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

23 years with a frost

Across 23 years with a frost, the median last spring frost at O O Rch falls on 6 June and the median first autumn frost on 7 September, which leaves a median of 88 days between them.

Frost dates and growing season at O O Rch
Measure	Median, all years	Earliest period	Recent period (1956 to 2007)	Recent against earliest	Fitted trend
Last spring frost	6 June	n/a	6 June	n/a	n/a
First autumn frost	7 September	n/a	7 September	n/a	n/a
Growing days	88 days	n/a	88 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, 1950 to 2007

A day with at least 18.3 mm (0.7 in) of rain is expected about once in 2 years. A day with at least 43.0 mm (1.7 in) of rain is expected about once in 100 years.

Rainfall return levels at O O Rch: the daily rain expected about once in a given number of years
Expected about once in	A day with at least	Note
2 years	18.3 mm (0.7 in)
5 years	25.1 mm (1.0 in)
10 years	29.5 mm (1.2 in)
25 years	35.0 mm (1.4 in)
50 years	39.1 mm (1.5 in)	Longer than the 40 years of record
100 years	43.0 mm (1.7 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 1950 to 2007.

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: 40.6 mm (1.6 in) in 2000; 33.0 mm (1.3 in) in 1962; 31.8 mm (1.3 in) in 1976.

Download the Data

Data for O O Rch standing records by year: CSV or JSON. Field meanings are on the data page.
Data for O O Rch 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 2025-12-31. Last revised 31 December 2025 (2025-12-31).