Usta 8 WNW Kelly Rch Weather Records (USC00398528)

Record envelope, standing records and threshold days for Usta 8 WNW Kelly Rch (USC00398528), South Dakota, United States, with 53 years of record.

Key Facts for Usta 8 WNW Kelly Rch

Usta 8 WNW Kelly Rch (USC00398528) is a weather station in South Dakota, United States at 45.25 latitude and -102.31 longitude, 725 m (2,380 ft) above sea level.
The station reports from 1957 to 2009, 53 years of record.
1,464 records set at Usta 8 WNW Kelly Rch still stand.
Records are tracked for tmax, tmin, prcp, snow, snwd: an element needs 30 years of data to be eligible.
Usta 8 WNW Kelly Rch set a daily record low maximum temperature of 20.0 C (68.0 F) on 29 July 2009.

About the Station

Location: South Dakota, United States, 45.25 latitude, -102.31 longitude.
Elevation: 725 m (2,380 ft).
Period of record: 1957 to 2009, 53 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 Usta 8 WNW Kelly 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 Usta 8 WNW Kelly Rch, with 2026 drawn through them
Month	Highest record high	Lowest record low	2026 highest maximum	2026 lowest minimum
Jan	18.3 C (64.9 F)	-41.1 C (-42.0 F)	n/a	n/a
Feb	22.8 C (73.0 F)	-43.3 C (-45.9 F)	n/a	n/a
Mar	27.8 C (82.0 F)	-40.0 C (-40.0 F)	n/a	n/a
Apr	36.1 C (97.0 F)	-18.3 C (-0.9 F)	n/a	n/a
May	36.1 C (97.0 F)	-10.6 C (12.9 F)	n/a	n/a
Jun	41.7 C (107.1 F)	-0.6 C (30.9 F)	n/a	n/a
Jul	43.3 C (109.9 F)	1.1 C (34.0 F)	n/a	n/a
Aug	43.3 C (109.9 F)	-0.6 C (30.9 F)	n/a	n/a
Sep	42.8 C (109.0 F)	-9.4 C (15.1 F)	n/a	n/a
Oct	37.8 C (100.0 F)	-23.9 C (-11.0 F)	n/a	n/a
Nov	27.2 C (81.0 F)	-32.8 C (-27.0 F)	n/a	n/a
Dec	21.1 C (70.0 F)	-40.6 C (-41.1 F)	n/a	n/a

Which Years Hold Standing Records

1,464 standing records

1,464 records at Usta 8 WNW Kelly Rch still stand. 1985 holds the most, with 55.

Standing records at Usta 8 WNW Kelly Rch by the year they were set
Year set	Standing records
1958	12
1959	50
1960	41
1961	36
1962	37
1963	47
1964	34
1965	41
1966	39
1967	27
1968	34
1969	46
1970	20
1971	18
1972	37
1973	23
1974	34
1975	27
1976	33
1977	33
1978	20
1979	33
1980	36
1981	34
1982	24
1983	49
1984	21
1985	55
1986	21
1987	27
1988	55
1989	31
1990	34
1991	42
1992	39
1993	21
1994	18
1997	6
1998	32
1999	46
2000	44
2001	27
2002	32
2003	24
2004	15
2005	1
2006	3
2007	3
2009	2

All-Time Record Progression

6 new records

6 all-time records were set at Usta 8 WNW Kelly Rch between 28 February 1987 and 29 July 1999. Each dot is a new record.

When Usta 8 WNW Kelly Rch set new all-time records
Date	Kind	Detail
1987-02-28	Record daily snowfall	Record daily snowfall 40.6 cm (16.0 in)
1989-02-02	Record low maximum temperature	Record low maximum temperature -28.9 C (-20.0 F)
1989-08-27	Record daily precipitation	Record daily precipitation 76.2 mm (3.0 in)
1989-12-22	Record low maximum temperature	Record low maximum temperature -34.4 C (-29.9 F)
1994-02-10	Record low minimum temperature	Record low minimum temperature -43.3 C (-45.9 F)
1999-07-29	Record high minimum temperature	Record high minimum temperature 24.4 C (75.9 F)

Wettest Day of Each Month

Aug: 76.2 mm (3.0 in)

The wettest day on record for each calendar month at Usta 8 WNW Kelly Rch. The most was 76.2 mm (3.0 in) on 27 August 1989.

Record daily precipitation for each month at Usta 8 WNW Kelly Rch
Month	Record daily precipitation (mm)	Date
Jan	12.7 mm (0.5 in)	15 January 1999
Feb	55.9 mm (2.2 in)	24 February 1998
Mar	50.8 mm (2.0 in)	11 March 1984
Apr	60.5 mm (2.4 in)	28 April 1975
May	50.8 mm (2.0 in)	8 May 1986
Jun	63.5 mm (2.5 in)	20 June 1987
Jul	68.6 mm (2.7 in)	6 July 1977
Aug	76.2 mm (3.0 in)	27 August 1989
Sep	55.9 mm (2.2 in)	21 September 1989
Oct	43.2 mm (1.7 in)	5 October 1972
Nov	25.4 mm (1.0 in)	14 November 2003
Dec	26.7 mm (1.1 in)	2 December 1964

Period of Record Coverage

1958 to 2009

49 years of record at Usta 8 WNW Kelly Rch, 1958 to 2009. 18 years have data for under 90 percent of days and are left out of rankings: 1958, 1984, 1985, 1986, 1989, 1992, 1993, 1994 and others.

Days with data per year at Usta 8 WNW Kelly Rch
Year	Days with data	Share of year	Complete
1958	116	32%	No
1959	363	99%	Yes
1960	366	100%	Yes
1961	364	100%	Yes
1962	359	98%	Yes
1963	363	99%	Yes
1964	365	100%	Yes
1965	364	100%	Yes
1966	364	100%	Yes
1967	364	100%	Yes
1968	366	100%	Yes
1969	364	100%	Yes
1970	365	100%	Yes
1971	341	93%	Yes
1972	366	100%	Yes
1973	365	100%	Yes
1974	365	100%	Yes
1975	363	99%	Yes
1976	365	100%	Yes
1977	365	100%	Yes
1978	333	91%	Yes
1979	365	100%	Yes
1980	334	91%	Yes
1981	362	99%	Yes
1982	359	98%	Yes
1983	348	95%	Yes
1984	300	82%	No
1985	297	81%	No
1986	246	67%	No
1987	355	97%	Yes
1988	330	90%	Yes
1989	247	68%	No
1990	356	98%	Yes
1991	339	93%	Yes
1992	304	83%	No
1993	231	63%	No
1994	109	30%	No
1997	79	22%	No
1998	253	69%	No
1999	360	99%	Yes
2000	329	90%	No
2001	349	96%	Yes
2002	238	65%	No
2003	315	86%	No
2004	178	49%	No
2005	30	8%	No
2006	121	33%	No
2007	28	8%	No
2009	40	11%	No

Latest Records

Latest records at Usta 8 WNW Kelly Rch
Date	Station	Record	Value	Beat old record by	Old record stood	Significance
29 July 2009	Usta 8 WNW Kelly Rch, US	daily low max	20.0 C (68.0 F)	2.2 C (4.0 F)	38 years	20 of 100 (Routine)
7 July 2009	Usta 8 WNW Kelly Rch, US	daily low max	23.3 C (73.9 F)	0.6 C (1.1 F)	38 years	17 of 100 (Routine)
2 July 2009	Usta 8 WNW Kelly Rch, US	daily rain	51.3 mm (2.0 in)	32.2 mm (1.3 in)	16 years	41 of 100 (Notable)
25 January 2007	Usta 8 WNW Kelly Rch, US	daily high max	15.6 C (60.1 F)	4.5 C (8.1 F)	33 years	20 of 100 (Routine)
9 January 2007	Usta 8 WNW Kelly Rch, US	daily high max	14.4 C (57.9 F)	2.2 C (4.0 F)	4 years	8 of 100 (Routine)
4 January 2007	Usta 8 WNW Kelly Rch, US	daily rain	3.8 mm (0.15 in)	1.3 mm (0.05 in)	29 years	19 of 100 (Routine)
4 January 2007	Usta 8 WNW Kelly Rch, US	daily high max	12.8 C (55.0 F)	1.1 C (2.0 F)	4 years	7 of 100 (Routine)
13 December 2006	Usta 8 WNW Kelly Rch, US	daily high min (Tie)	-1.1 C (30.0 F)	tie	36 years	3 of 100 (Routine)
9 December 2006	Usta 8 WNW Kelly Rch, US	daily high max (Tie)	15.6 C (60.1 F)	tie	27 years	3 of 100 (Routine)
8 December 2006	Usta 8 WNW Kelly Rch, US	daily high max	15.0 C (59.0 F)	3.9 C (7.0 F)	16 years	12 of 100 (Routine)
4 December 2006	Usta 8 WNW Kelly Rch, US	daily low min	-24.4 C (-11.9 F)	0.5 C (0.9 F)	33 years	14 of 100 (Routine)
10 June 2006	Usta 8 WNW Kelly Rch, US	daily low max (Tie)	15.0 C (59.0 F)	tie	21 years	2 of 100 (Routine)
28 May 2006	Usta 8 WNW Kelly Rch, US	daily high min	15.0 C (59.0 F)	0.6 C (1.1 F)	36 years	16 of 100 (Routine)
26 May 2006	Usta 8 WNW Kelly Rch, US	daily high max (Tie)	33.3 C (91.9 F)	tie	36 years	3 of 100 (Routine)
18 May 2006	Usta 8 WNW Kelly Rch, US	daily high max (Tie)	33.3 C (91.9 F)	tie	8 years	1 of 100 (Routine)
22 March 2006	Usta 8 WNW Kelly Rch, US	daily low max (Tie)	-2.2 C (28.0 F)	tie	40 years	4 of 100 (Routine)
13 June 2005	Usta 8 WNW Kelly Rch, US	daily rain (Tie)	38.1 mm (1.5 in)	tie	4 years	1 of 100 (Routine)
4 June 2005	Usta 8 WNW Kelly Rch, US	daily low max	13.3 C (55.9 F)	0.6 C (1.1 F)	4 years	6 of 100 (Routine)
1 June 2005	Usta 8 WNW Kelly Rch, US	daily rain	10.2 mm (0.4 in)	2.8 mm (0.11 in)	40 years	18 of 100 (Routine)
29 June 2004	Usta 8 WNW Kelly Rch, US	daily low min	2.8 C (37.0 F)	0.5 C (0.9 F)	19 years	10 of 100 (Routine)

Climate Trend

24 complete years, 1959 to 1999

One stripe for each of 24 complete years at Usta 8 WNW Kelly Rch, 1959 to 1999. Blue stripes are years cooler than the station's own mean of 6.9 C (44.4 F); red stripes are warmer. The coolest year was 1972, at 5.3 C (41.5 F), and the warmest was 1981, at 9.1 C (48.3 F). The strongest colour marks a difference of 2.3 C (4.1 F).

Annual mean temperature at Usta 8 WNW Kelly Rch as warming stripes, 1959 to 1999
Year	Annual mean temperature	Difference from the station mean
1959	6.6 C	-0.25 C
1960	6.9 C	-0.03 C
1961	8.0 C	+1.08 C
1962	7.3 C	+0.42 C
1963	8.5 C	+1.63 C
1964	6.8 C	-0.12 C
1965	5.6 C	-1.26 C
1966	5.7 C	-1.15 C
1967	6.5 C	-0.40 C
1968	6.2 C	-0.71 C
1969	6.1 C	-0.83 C
1970	5.9 C	-1.02 C
1972	5.3 C	-1.58 C
1973	7.4 C	+0.48 C
1974	7.5 C	+0.57 C
1975	5.7 C	-1.19 C
1976	7.6 C	+0.75 C
1977	7.4 C	+0.52 C
1979	5.6 C	-1.28 C
1981	9.1 C	+2.20 C
1982	6.1 C	-0.75 C
1983	8.1 C	+1.20 C
1987	7.3 C	+0.38 C
1999	8.2 C	+1.30 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

1957 to 2009

Yearly extremes at Usta 8 WNW Kelly Rch: the record and the median year
Measure	Record	Year of the record	Median year	Years with a value
Hottest day (TXx)	43.3 C (109.9 F)	1960	39.4 C (102.9 F)	49
Coldest night (TNn)	-43.3 C (-45.9 F)	1994	-34.4 C (-29.9 F)	49
Wettest day (Rx1day)	76.2 mm (3.0 in)	1989	39.7 mm (1.6 in)	50
Wettest five days (Rx5day)	140.0 mm (5.5 in)	1989	53.3 mm (2.1 in)	50
Longest dry spell (CDD)	119 days	1988	37 days	50

Hottest day (TXx)

The hottest day of the year at Usta 8 WNW Kelly Rch, 1957 to 2009. The record is 43.3 C (109.9 F) in 1960, marked on the chart; the median year is 39.4 C (102.9 F).

Hottest day (TXx) at Usta 8 WNW Kelly Rch by year
Year	Hottest day (TXx)
1957	n/a
1958	38.3 C (100.9 F)
1959	42.8 C (109.0 F)
1960	43.3 C (109.9 F)
1961	42.2 C (108.0 F)
1962	38.9 C (102.0 F)
1963	40.0 C (104.0 F)
1964	41.1 C (106.0 F)
1965	38.9 C (102.0 F)
1966	40.6 C (105.1 F)
1967	37.2 C (99.0 F)
1968	38.3 C (100.9 F)
1969	39.4 C (102.9 F)
1970	40.6 C (105.1 F)
1971	38.3 C (100.9 F)
1972	36.7 C (98.1 F)
1973	43.3 C (109.9 F)
1974	39.4 C (102.9 F)
1975	40.6 C (105.1 F)
1976	40.6 C (105.1 F)
1977	38.9 C (102.0 F)
1978	40.0 C (104.0 F)
1979	40.6 C (105.1 F)
1980	42.2 C (108.0 F)
1981	43.3 C (109.9 F)
1982	37.8 C (100.0 F)
1983	41.1 C (106.0 F)
1984	39.4 C (102.9 F)
1985	41.1 C (106.0 F)
1986	37.2 C (99.0 F)
1987	38.9 C (102.0 F)
1988	41.7 C (107.1 F)
1989	37.2 C (99.0 F)
1990	41.1 C (106.0 F)
1991	40.0 C (104.0 F)
1992	36.1 C (97.0 F)
1993	31.1 C (88.0 F)
1994	37.2 C (99.0 F)
1997	35.6 C (96.1 F)
1998	40.0 C (104.0 F)
1999	41.1 C (106.0 F)
2000	40.0 C (104.0 F)
2001	43.3 C (109.9 F)
2002	38.9 C (102.0 F)
2003	41.1 C (106.0 F)
2004	38.3 C (100.9 F)
2005	36.1 C (97.0 F)
2006	37.2 C (99.0 F)
2007	15.6 C (60.1 F)
2009	34.4 C (93.9 F)

Coldest night (TNn)

The coldest night of the year at Usta 8 WNW Kelly Rch, 1957 to 2009. The record is -43.3 C (-45.9 F) in 1994, marked on the chart; the median year is -34.4 C (-29.9 F).

Coldest night (TNn) at Usta 8 WNW Kelly Rch by year
Year	Coldest night (TNn)
1957	n/a
1958	-34.4 C (-29.9 F)
1959	-33.3 C (-27.9 F)
1960	-35.0 C (-31.0 F)
1961	-27.8 C (-18.0 F)
1962	-35.0 C (-31.0 F)
1963	-37.8 C (-36.0 F)
1964	-35.6 C (-32.1 F)
1965	-31.7 C (-25.1 F)
1966	-39.4 C (-38.9 F)
1967	-33.9 C (-29.0 F)
1968	-34.4 C (-29.9 F)
1969	-33.9 C (-29.0 F)
1970	-38.9 C (-38.0 F)
1971	-35.0 C (-31.0 F)
1972	-41.1 C (-42.0 F)
1973	-33.9 C (-29.0 F)
1974	-31.7 C (-25.1 F)
1975	-34.4 C (-29.9 F)
1976	-38.9 C (-38.0 F)
1977	-37.8 C (-36.0 F)
1978	-34.4 C (-29.9 F)
1979	-34.4 C (-29.9 F)
1980	-37.2 C (-35.0 F)
1981	-29.4 C (-20.9 F)
1982	-37.2 C (-35.0 F)
1983	-35.0 C (-31.0 F)
1984	-31.7 C (-25.1 F)
1985	-32.2 C (-26.0 F)
1986	-28.9 C (-20.0 F)
1987	-23.9 C (-11.0 F)
1988	-40.0 C (-40.0 F)
1989	-40.6 C (-41.1 F)
1990	-40.0 C (-40.0 F)
1991	-33.3 C (-27.9 F)
1992	-30.6 C (-23.1 F)
1993	-32.2 C (-26.0 F)
1994	-43.3 C (-45.9 F)
1997	-18.3 C (-0.9 F)
1998	-40.0 C (-40.0 F)
1999	-32.2 C (-26.0 F)
2000	-33.3 C (-27.9 F)
2001	-34.4 C (-29.9 F)
2002	-30.0 C (-22.0 F)
2003	-34.4 C (-29.9 F)
2004	-31.7 C (-25.1 F)
2005	1.7 C (35.1 F)
2006	-26.7 C (-16.1 F)
2007	-27.8 C (-18.0 F)
2009	-18.9 C (-2.0 F)

Wettest day (Rx1day)

The wettest day of the year at Usta 8 WNW Kelly Rch, 1957 to 2009. The record is 76.2 mm (3.0 in) in 1989, marked on the chart; the median year is 39.7 mm (1.6 in).

Wettest day (Rx1day) at Usta 8 WNW Kelly Rch by year
Year	Wettest day (Rx1day)
1957	39.1 mm (1.5 in)
1958	23.9 mm (0.9 in)
1959	25.9 mm (1.0 in)
1960	44.5 mm (1.8 in)
1961	35.3 mm (1.4 in)
1962	41.9 mm (1.6 in)
1963	27.9 mm (1.1 in)
1964	39.9 mm (1.6 in)
1965	27.9 mm (1.1 in)
1966	17.8 mm (0.7 in)
1967	42.9 mm (1.7 in)
1968	38.1 mm (1.5 in)
1969	47.8 mm (1.9 in)
1970	25.4 mm (1.0 in)
1971	47.0 mm (1.9 in)
1972	43.2 mm (1.7 in)
1973	41.4 mm (1.6 in)
1974	31.5 mm (1.2 in)
1975	60.5 mm (2.4 in)
1976	48.0 mm (1.9 in)
1977	68.6 mm (2.7 in)
1978	31.8 mm (1.3 in)
1979	45.7 mm (1.8 in)
1980	29.7 mm (1.2 in)
1981	19.1 mm (0.8 in)
1982	48.3 mm (1.9 in)
1983	48.3 mm (1.9 in)
1984	50.8 mm (2.0 in)
1985	34.8 mm (1.4 in)
1986	55.1 mm (2.2 in)
1987	63.5 mm (2.5 in)
1988	47.0 mm (1.9 in)
1989	76.2 mm (3.0 in)
1990	21.6 mm (0.9 in)
1991	39.4 mm (1.6 in)
1992	47.0 mm (1.9 in)
1993	38.1 mm (1.5 in)
1994	34.3 mm (1.4 in)
1997	40.6 mm (1.6 in)
1998	55.9 mm (2.2 in)
1999	38.1 mm (1.5 in)
2000	42.7 mm (1.7 in)
2001	31.8 mm (1.3 in)
2002	30.5 mm (1.2 in)
2003	50.8 mm (2.0 in)
2004	25.4 mm (1.0 in)
2005	38.1 mm (1.5 in)
2006	19.1 mm (0.8 in)
2007	3.8 mm (0.15 in)
2009	51.3 mm (2.0 in)

Wettest five days (Rx5day)

The wettest five days of the year at Usta 8 WNW Kelly Rch, 1957 to 2009. The record is 140.0 mm (5.5 in) in 1989, marked on the chart; the median year is 53.3 mm (2.1 in).

Wettest five days (Rx5day) at Usta 8 WNW Kelly Rch by year
Year	Wettest five days (Rx5day)
1957	46.7 mm (1.8 in)
1958	40.5 mm (1.6 in)
1959	39.6 mm (1.6 in)
1960	60.6 mm (2.4 in)
1961	36.6 mm (1.4 in)
1962	96.0 mm (3.8 in)
1963	59.4 mm (2.3 in)
1964	58.6 mm (2.3 in)
1965	44.7 mm (1.8 in)
1966	25.5 mm (1.0 in)
1967	52.0 mm (2.0 in)
1968	58.6 mm (2.3 in)
1969	91.0 mm (3.6 in)
1970	42.9 mm (1.7 in)
1971	52.1 mm (2.1 in)
1972	56.2 mm (2.2 in)
1973	62.4 mm (2.5 in)
1974	45.8 mm (1.8 in)
1975	66.3 mm (2.6 in)
1976	85.4 mm (3.4 in)
1977	87.2 mm (3.4 in)
1978	53.1 mm (2.1 in)
1979	58.4 mm (2.3 in)
1980	52.5 mm (2.1 in)
1981	48.3 mm (1.9 in)
1982	76.5 mm (3.0 in)
1983	48.3 mm (1.9 in)
1984	50.8 mm (2.0 in)
1985	53.4 mm (2.1 in)
1986	104.1 mm (4.1 in)
1987	72.4 mm (2.9 in)
1988	59.7 mm (2.4 in)
1989	140.0 mm (5.5 in)
1990	38.9 mm (1.5 in)
1991	47.8 mm (1.9 in)
1992	47.0 mm (1.9 in)
1993	80.6 mm (3.2 in)
1994	33.9 mm (1.3 in)
1997	54.6 mm (2.1 in)
1998	55.9 mm (2.2 in)
1999	55.9 mm (2.2 in)
2000	72.1 mm (2.8 in)
2001	43.0 mm (1.7 in)
2002	30.5 mm (1.2 in)
2003	101.6 mm (4.0 in)
2004	26.2 mm (1.0 in)
2005	52.1 mm (2.1 in)
2006	25.5 mm (1.0 in)
2007	3.8 mm (0.15 in)
2009	80.5 mm (3.2 in)

Longest dry spell (CDD)

The longest dry spell of the year at Usta 8 WNW Kelly Rch, 1957 to 2009. The record is 119 days in 1988, marked on the chart; the median year is 37 days.

Longest dry spell (CDD) at Usta 8 WNW Kelly Rch by year
Year	Longest dry spell (CDD)
1957	46 days
1958	31 days
1959	41 days
1960	37 days
1961	35 days
1962	29 days
1963	36 days
1964	38 days
1965	52 days
1966	24 days
1967	40 days
1968	47 days
1969	69 days
1970	23 days
1971	73 days
1972	27 days
1973	29 days
1974	45 days
1975	30 days
1976	42 days
1977	24 days
1978	47 days
1979	45 days
1980	65 days
1981	82 days
1982	29 days
1983	63 days
1984	62 days
1985	36 days
1986	30 days
1987	74 days
1988	119 days
1989	36 days
1990	66 days
1991	44 days
1992	37 days
1993	17 days
1994	22 days
1997	27 days
1998	28 days
1999	42 days
2000	94 days
2001	35 days
2002	41 days
2003	29 days
2004	26 days
2005	6 days
2006	31 days
2007	27 days
2009	34 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

24 years with a frost

Across 24 years with a frost, the median last spring frost at Usta 8 WNW Kelly Rch falls on 15 May and the median first autumn frost on 14 September, which leaves a median of 123 days between them.

Frost dates and growing season at Usta 8 WNW Kelly Rch
Measure	Median, all years	Earliest period	Recent period (1959 to 1999)	Recent against earliest	Fitted trend
Last spring frost	15 May	n/a	15 May	n/a	n/a
First autumn frost	14 September	n/a	14 September	n/a	n/a
Growing days	123 days	n/a	123 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

32 years, 1958 to 1999

A day with at least 39.2 mm (1.5 in) of rain is expected about once in 2 years. A day with at least 68.5 mm (2.7 in) of rain is expected about once in 100 years.

Rainfall return levels at Usta 8 WNW Kelly 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	39.2 mm (1.5 in)
5 years	50.3 mm (2.0 in)
10 years	56.1 mm (2.2 in)
25 years	62.0 mm (2.4 in)
50 years	65.6 mm (2.6 in)	Longer than the 32 years of record
100 years	68.5 mm (2.7 in)	Longer than the 32 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, 32 years of values from 1958 to 1999.

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: 68.6 mm (2.7 in) in 1977; 63.5 mm (2.5 in) in 1987; 60.5 mm (2.4 in) in 1975.

Download the Data

Data for Usta 8 WNW Kelly Rch standing records by year: CSV or JSON. Field meanings are on the data page.
Data for Usta 8 WNW Kelly 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 2026-10-14 (14 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).