Ione 18 S Weather Records (USC00354161)

Record envelope, standing records and threshold days for Ione 18 S (USC00354161), Oregon, United States, with 78 years of record.

Key Facts for Ione 18 S

Ione 18 S (USC00354161) is a weather station in Oregon, United States at 45.32 latitude and -119.88 longitude, 660 m (2,165 ft) above sea level.
The station reports from 1935 to 2012, 78 years of record.
360 records set at Ione 18 S still stand.
Records are tracked for prcp, snow, snwd: an element needs 30 years of data to be eligible.
Ione 18 S set a daily record snowfall of 10.2 cm (4.0 in) on 18 January 2012.

About the Station

Location: Oregon, United States, 45.32 latitude, -119.88 longitude.
Elevation: 660 m (2,165 ft).
Period of record: 1935 to 2012, 78 years.
Eligible elements: 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 Ione 18 S. 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 Ione 18 S, with 2026 drawn through them
Month	Highest record high	Lowest record low	2026 highest maximum	2026 lowest minimum
Jan	9.4 C (48.9 F)	-30.0 C (-22.0 F)	n/a	n/a
Feb	14.4 C (57.9 F)	-23.3 C (-9.9 F)	n/a	n/a
Mar	n/a	n/a	n/a	n/a
Apr	n/a	n/a	n/a	n/a
May	n/a	n/a	n/a	n/a
Jun	n/a	n/a	n/a	n/a
Jul	n/a	n/a	n/a	n/a
Aug	n/a	n/a	n/a	n/a
Sep	n/a	n/a	n/a	n/a
Oct	n/a	n/a	n/a	n/a
Nov	n/a	n/a	n/a	n/a
Dec	10.0 C (50.0 F)	-9.4 C (15.1 F)	n/a	n/a

Which Years Hold Standing Records

360 standing records

360 records at Ione 18 S still stand. 1936 holds the most, with 138.

All-Time Record Progression

2 new records

2 all-time records were set at Ione 18 S between 12 February 1995 and 18 November 1996. Each dot is a new record.

When Ione 18 S set new all-time records
Date	Kind	Detail
1995-02-12	Record daily snowfall	Record daily snowfall 35.6 cm (14.0 in)
1996-11-18	Record daily precipitation	Record daily precipitation 54.6 mm (2.1 in)

Wettest Day of Each Month

Nov: 54.6 mm (2.1 in)

The wettest day on record for each calendar month at Ione 18 S. The most was 54.6 mm (2.1 in) on 18 November 1996.

Record daily precipitation for each month at Ione 18 S
Month	Record daily precipitation (mm)	Date
Jan	41.4 mm (1.6 in)	15 January 1956
Feb	35.1 mm (1.4 in)	28 February 1989
Mar	24.9 mm (1.0 in)	2 March 1957
Apr	29.2 mm (1.1 in)	28 April 1943
May	35.6 mm (1.4 in)	6 May 1983
Jun	43.7 mm (1.7 in)	10 June 1969
Jul	31.8 mm (1.3 in)	5 July 1948
Aug	27.7 mm (1.1 in)	29 August 1943
Sep	32.3 mm (1.3 in)	20 September 1982
Oct	38.9 mm (1.5 in)	20 October 1947
Nov	54.6 mm (2.1 in)	18 November 1996
Dec	46.5 mm (1.8 in)	22 December 1964

Period of Record Coverage

1935 to 1939

5 years of record at Ione 18 S, 1935 to 1939. 5 years have data for under 90 percent of days and are left out of rankings: 1935, 1936, 1937, 1938, 1939.

Latest Records

Latest records at Ione 18 S
Date	Station	Record	Value	Beat old record by	Old record stood	Significance
18 January 2012	Ione 18 S, US	daily snowfall	10.2 cm (4.0 in)	2.6 cm (1.0 in)	74 years	34 of 100 (Routine)
18 January 2012	Ione 18 S, US	daily rain	15.2 mm (0.6 in)	7.1 mm (0.28 in)	37 years	20 of 100 (Routine)
24 January 2010	Ione 18 S, US	daily rain	9.1 mm (0.36 in)	0.2 mm (0.01 in)	10 years	10 of 100 (Routine)
22 May 2006	Ione 18 S, US	daily rain	18.3 mm (0.7 in)	1.8 mm (0.07 in)	64 years	20 of 100 (Routine)
25 March 2006	Ione 18 S, US	daily rain	20.3 mm (0.8 in)	8.4 mm (0.33 in)	65 years	20 of 100 (Routine)
31 December 2005	Ione 18 S, US	daily rain	24.4 mm (1.0 in)	8.1 mm (0.32 in)	28 years	20 of 100 (Routine)
19 December 2005	Ione 18 S, US	daily rain	10.2 mm (0.4 in)	3.1 mm (0.12 in)	40 years	20 of 100 (Routine)
2 December 2005	Ione 18 S, US	daily snow depth	5.1 cm (2.0 in)	2.6 cm (1.0 in)	34 years	20 of 100 (Routine)
1 December 2005	Ione 18 S, US	daily snow depth (Tie)	2.5 cm (1.0 in)	tie	44 years	5 of 100 (Routine)
22 March 2005	Ione 18 S, US	daily rain	11.4 mm (0.4 in)	1.2 mm (0.05 in)	68 years	20 of 100 (Routine)
1 January 2005	Ione 18 S, US	daily rain	16.5 mm (0.6 in)	2.3 mm (0.09 in)	29 years	19 of 100 (Routine)
3 November 2004	Ione 18 S, US	daily rain	19.1 mm (0.8 in)	2.8 mm (0.11 in)	60 years	20 of 100 (Routine)
22 August 2004	Ione 18 S, US	daily rain	21.6 mm (0.9 in)	7.6 mm (0.30 in)	39 years	20 of 100 (Routine)
6 August 2004	Ione 18 S, US	daily rain	12.7 mm (0.5 in)	3.0 mm (0.12 in)	27 years	20 of 100 (Routine)
15 April 2004	Ione 18 S, US	daily rain	15.2 mm (0.6 in)	5.0 mm (0.20 in)	67 years	20 of 100 (Routine)
6 January 2004	Ione 18 S, US	daily rain	14.2 mm (0.6 in)	3.8 mm (0.15 in)	37 years	20 of 100 (Routine)
31 December 2003	Ione 18 S, US	daily snow depth (Tie)	10.2 cm (4.0 in)	tie	66 years	6 of 100 (Routine)
29 December 2003	Ione 18 S, US	daily rain	18.0 mm (0.7 in)	6.1 mm (0.24 in)	52 years	20 of 100 (Routine)
13 December 2003	Ione 18 S, US	daily rain	17.3 mm (0.7 in)	6.4 mm (0.25 in)	25 years	20 of 100 (Routine)
10 December 2003	Ione 18 S, US	daily snow depth	7.6 cm (3.0 in)	5.1 cm (2.0 in)	8 years	18 of 100 (Routine)

Extremes by Year

1935 to 2012

Yearly extremes at Ione 18 S: the record and the median year
Measure	Record	Year of the record	Median year	Years with a value
Hottest day (TXx)	14.4 C (57.9 F)	1936	10.0 C (50.0 F)	5
Coldest night (TNn)	-30.0 C (-22.0 F)	1937	-19.4 C (-2.9 F)	5
Wettest day (Rx1day)	54.6 mm (2.1 in)	1996	23.6 mm (0.9 in)	76
Wettest five days (Rx5day)	93.7 mm (3.7 in)	1964	38.7 mm (1.5 in)	74
Longest dry spell (CDD)	110 days	1974	46 days	75

Hottest day (TXx)

The hottest day of the year at Ione 18 S, 1935 to 2012. The record is 14.4 C (57.9 F) in 1936, marked on the chart; the median year is 10.0 C (50.0 F).

Hottest day (TXx) at Ione 18 S by year
Year	Hottest day (TXx)
1935	10.0 C (50.0 F)
1936	14.4 C (57.9 F)
1937	10.0 C (50.0 F)
1938	1.7 C (35.1 F)
1939	6.1 C (43.0 F)
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
2009	n/a
2010	n/a
2011	n/a
2012	n/a

Coldest night (TNn)

The coldest night of the year at Ione 18 S, 1935 to 2012. The record is -30.0 C (-22.0 F) in 1937, marked on the chart; the median year is -19.4 C (-2.9 F).

Coldest night (TNn) at Ione 18 S by year
Year	Coldest night (TNn)
1935	-9.4 C (15.1 F)
1936	-23.3 C (-9.9 F)
1937	-30.0 C (-22.0 F)
1938	-2.2 C (28.0 F)
1939	-19.4 C (-2.9 F)
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
2009	n/a
2010	n/a
2011	n/a
2012	n/a

Wettest day (Rx1day)

The wettest day of the year at Ione 18 S, 1935 to 2012. The record is 54.6 mm (2.1 in) in 1996, marked on the chart; the median year is 23.6 mm (0.9 in).

Wettest day (Rx1day) at Ione 18 S by year
Year	Wettest day (Rx1day)
1935	38.4 mm (1.5 in)
1936	21.1 mm (0.8 in)
1937	26.2 mm (1.0 in)
1938	27.9 mm (1.1 in)
1939	14.0 mm (0.6 in)
1940	19.1 mm (0.8 in)
1941	24.6 mm (1.0 in)
1942	29.5 mm (1.2 in)
1943	29.2 mm (1.1 in)
1944	19.6 mm (0.8 in)
1945	26.7 mm (1.1 in)
1946	20.8 mm (0.8 in)
1947	38.9 mm (1.5 in)
1948	31.8 mm (1.3 in)
1949	31.0 mm (1.2 in)
1950	43.2 mm (1.7 in)
1951	22.1 mm (0.9 in)
1952	22.9 mm (0.9 in)
1953	31.8 mm (1.3 in)
1954	23.4 mm (0.9 in)
1955	19.1 mm (0.8 in)
1956	41.4 mm (1.6 in)
1957	27.4 mm (1.1 in)
1958	23.6 mm (0.9 in)
1959	16.8 mm (0.7 in)
1960	23.4 mm (0.9 in)
1961	22.4 mm (0.9 in)
1962	20.6 mm (0.8 in)
1963	23.6 mm (0.9 in)
1964	46.5 mm (1.8 in)
1965	37.3 mm (1.5 in)
1966	24.6 mm (1.0 in)
1967	13.2 mm (0.5 in)
1968	21.6 mm (0.9 in)
1969	43.7 mm (1.7 in)
1970	19.3 mm (0.8 in)
1971	19.3 mm (0.8 in)
1972	11.4 mm (0.4 in)
1973	19.6 mm (0.8 in)
1974	12.2 mm (0.5 in)
1975	25.4 mm (1.0 in)
1976	17.3 mm (0.7 in)
1977	19.1 mm (0.8 in)
1978	26.9 mm (1.1 in)
1979	25.9 mm (1.0 in)
1980	27.9 mm (1.1 in)
1981	25.1 mm (1.0 in)
1982	32.3 mm (1.3 in)
1983	35.6 mm (1.4 in)
1984	15.2 mm (0.6 in)
1985	22.9 mm (0.9 in)
1986	15.0 mm (0.6 in)
1987	24.1 mm (0.9 in)
1988	24.6 mm (1.0 in)
1989	35.1 mm (1.4 in)
1990	30.5 mm (1.2 in)
1991	26.7 mm (1.1 in)
1992	28.4 mm (1.1 in)
1993	17.8 mm (0.7 in)
1994	27.4 mm (1.1 in)
1995	31.8 mm (1.3 in)
1996	54.6 mm (2.1 in)
1997	21.6 mm (0.9 in)
1998	23.9 mm (0.9 in)
1999	8.1 mm (0.32 in)
2000	23.4 mm (0.9 in)
2001	19.1 mm (0.8 in)
2002	26.7 mm (1.1 in)
2003	18.0 mm (0.7 in)
2004	21.6 mm (0.9 in)
2005	24.4 mm (1.0 in)
2006	20.3 mm (0.8 in)
2009	12.7 mm (0.5 in)
2010	19.1 mm (0.8 in)
2011	11.7 mm (0.5 in)
2012	15.2 mm (0.6 in)

Wettest five days (Rx5day)

The wettest five days of the year at Ione 18 S, 1935 to 2012. The record is 93.7 mm (3.7 in) in 1964, marked on the chart; the median year is 38.7 mm (1.5 in).

Wettest five days (Rx5day) at Ione 18 S by year
Year	Wettest five days (Rx5day)
1935	40.4 mm (1.6 in)
1936	28.7 mm (1.1 in)
1937	41.4 mm (1.6 in)
1938	32.0 mm (1.3 in)
1939	21.9 mm (0.9 in)
1940	31.9 mm (1.3 in)
1941	41.9 mm (1.6 in)
1942	40.9 mm (1.6 in)
1943	39.9 mm (1.6 in)
1944	26.0 mm (1.0 in)
1945	57.1 mm (2.2 in)
1946	35.6 mm (1.4 in)
1947	65.6 mm (2.6 in)
1948	40.2 mm (1.6 in)
1949	45.5 mm (1.8 in)
1950	46.2 mm (1.8 in)
1951	33.6 mm (1.3 in)
1952	23.8 mm (0.9 in)
1953	38.7 mm (1.5 in)
1954	34.9 mm (1.4 in)
1955	33.6 mm (1.3 in)
1956	52.3 mm (2.1 in)
1957	56.6 mm (2.2 in)
1958	41.9 mm (1.6 in)
1959	23.7 mm (0.9 in)
1960	30.8 mm (1.2 in)
1961	36.8 mm (1.4 in)
1962	46.7 mm (1.8 in)
1963	39.9 mm (1.6 in)
1964	93.7 mm (3.7 in)
1965	43.7 mm (1.7 in)
1966	29.4 mm (1.2 in)
1967	20.3 mm (0.8 in)
1968	39.9 mm (1.6 in)
1969	61.8 mm (2.4 in)
1970	38.8 mm (1.5 in)
1971	24.9 mm (1.0 in)
1972	24.0 mm (0.9 in)
1973	40.6 mm (1.6 in)
1974	28.9 mm (1.1 in)
1975	33.8 mm (1.3 in)
1976	26.2 mm (1.0 in)
1977	38.7 mm (1.5 in)
1978	43.9 mm (1.7 in)
1979	48.2 mm (1.9 in)
1980	27.9 mm (1.1 in)
1981	32.2 mm (1.3 in)
1982	43.8 mm (1.7 in)
1983	47.8 mm (1.9 in)
1984	29.7 mm (1.2 in)
1985	36.9 mm (1.5 in)
1986	37.9 mm (1.5 in)
1987	34.0 mm (1.3 in)
1988	56.8 mm (2.2 in)
1989	26.1 mm (1.0 in)
1990	30.5 mm (1.2 in)
1991	40.6 mm (1.6 in)
1992	55.1 mm (2.2 in)
1993	33.8 mm (1.3 in)
1994	57.9 mm (2.3 in)
1995	54.1 mm (2.1 in)
1996	69.9 mm (2.8 in)
1997	30.5 mm (1.2 in)
1998	26.9 mm (1.1 in)
1999	11.9 mm (0.5 in)
2000	41.1 mm (1.6 in)
2001	21.1 mm (0.8 in)
2002	26.7 mm (1.1 in)
2003	43.4 mm (1.7 in)
2004	43.4 mm (1.7 in)
2005	51.4 mm (2.0 in)
2006	44.3 mm (1.7 in)
2009	22.7 mm (0.9 in)
2010	24.2 mm (1.0 in)
2011	n/a
2012	n/a

Longest dry spell (CDD)

The longest dry spell of the year at Ione 18 S, 1935 to 2012. The record is 110 days in 1974, marked on the chart; the median year is 46 days.

Longest dry spell (CDD) at Ione 18 S by year
Year	Longest dry spell (CDD)
1935	47 days
1936	77 days
1937	31 days
1938	35 days
1939	52 days
1940	55 days
1941	31 days
1942	42 days
1943	48 days
1944	43 days
1945	68 days
1946	34 days
1947	29 days
1948	38 days
1949	39 days
1950	64 days
1951	54 days
1952	40 days
1953	48 days
1954	49 days
1955	48 days
1956	44 days
1957	58 days
1958	67 days
1959	74 days
1960	46 days
1961	40 days
1962	61 days
1963	60 days
1964	50 days
1965	31 days
1966	58 days
1967	81 days
1968	37 days
1969	68 days
1970	57 days
1971	43 days
1972	62 days
1973	76 days
1974	110 days
1975	36 days
1976	46 days
1977	65 days
1978	61 days
1979	98 days
1980	52 days
1981	44 days
1982	21 days
1983	28 days
1984	31 days
1985	58 days
1986	49 days
1987	37 days
1988	84 days
1989	36 days
1990	28 days
1991	77 days
1992	30 days
1993	56 days
1994	46 days
1995	23 days
1996	33 days
1997	26 days
1998	48 days
1999	34 days
2000	63 days
2001	47 days
2002	40 days
2003	67 days
2004	38 days
2005	41 days
2006	30 days
2009	20 days
2010	25 days
2011	1 day
2012	n/a

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

56 years, 1936 to 2004

A day with at least 23.3 mm (0.9 in) of rain is expected about once in 2 years. A day with at least 54.9 mm (2.2 in) of rain is expected about once in 100 years.

Rainfall return levels at Ione 18 S: the daily rain expected about once in a given number of years
Expected about once in	A day with at least	Note
2 years	23.3 mm (0.9 in)
5 years	30.8 mm (1.2 in)
10 years	36.1 mm (1.4 in)
25 years	43.3 mm (1.7 in)
50 years	49.0 mm (1.9 in)
100 years	54.9 mm (2.2 in)	Longer than the 56 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, 56 years of values from 1936 to 2004.

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: 54.6 mm (2.1 in) in 1996; 46.5 mm (1.8 in) in 1964; 43.7 mm (1.7 in) in 1969.

Download the Data

Data for Ione 18 S standing records by year: CSV or JSON. Field meanings are on the data page.
Data for Ione 18 S 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 2026-10-15 (15 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).