Castle Valley Weather Records (USC00421241)

Record envelope, standing records and threshold days for Castle Valley (USC00421241), Utah, United States, with 32 years of record.

Key Facts for Castle Valley

Castle Valley (USC00421241) is a weather station in Utah, United States at 38.65 latitude and -109.40 longitude, 1,440 m (4,725 ft) above sea level.
The station reports from 1978 to 2009, 32 years of record.
1,464 records set at Castle Valley still stand.
Records are tracked for no element yet: an element needs 30 years of data to be eligible.

About the Station

Location: Utah, United States, 38.65 latitude, -109.40 longitude.
Elevation: 1,440 m (4,725 ft).
Period of record: 1978 to 2009, 32 years.
Eligible elements: none yet.

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 Castle Valley. 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 Castle Valley, with 2026 drawn through them
Month	Highest record high	Lowest record low	2026 highest maximum	2026 lowest minimum
Jan	16.1 C (61.0 F)	-22.2 C (-8.0 F)	n/a	n/a
Feb	21.7 C (71.1 F)	-25.6 C (-14.1 F)	n/a	n/a
Mar	27.8 C (82.0 F)	-12.8 C (9.0 F)	n/a	n/a
Apr	31.7 C (89.1 F)	-6.7 C (19.9 F)	n/a	n/a
May	36.7 C (98.1 F)	-1.1 C (30.0 F)	n/a	n/a
Jun	40.0 C (104.0 F)	2.8 C (37.0 F)	n/a	n/a
Jul	41.7 C (107.1 F)	5.0 C (41.0 F)	n/a	n/a
Aug	40.6 C (105.1 F)	5.0 C (41.0 F)	n/a	n/a
Sep	37.2 C (99.0 F)	-1.7 C (28.9 F)	n/a	n/a
Oct	32.2 C (90.0 F)	-6.7 C (19.9 F)	n/a	n/a
Nov	24.4 C (75.9 F)	-16.1 C (3.0 F)	n/a	n/a
Dec	19.4 C (66.9 F)	-23.3 C (-9.9 F)	n/a	n/a

Which Years Hold Standing Records

1,464 standing records

1,464 records at Castle Valley still stand. 1979 holds the most, with 98.

Standing records at Castle Valley by the year they were set
Year set	Standing records
1978	38
1979	98
1980	71
1981	60
1982	47
1983	48
1984	57
1985	53
1986	65
1987	43
1988	39
1989	78
1990	25
1991	12
1992	52
1993	26
1994	38
1995	57
1996	54
1997	35
1998	45
1999	36
2000	62
2001	33
2002	47
2003	34
2004	53
2005	39
2006	30
2007	36
2008	40
2009	13

Wettest Day of Each Month

Oct: 47.8 mm (1.9 in)

The wettest day on record for each calendar month at Castle Valley. The most was 47.8 mm (1.9 in) on 7 October 2006.

Record daily precipitation for each month at Castle Valley
Month	Record daily precipitation (mm)	Date
Jan	19.6 mm (0.8 in)	12 January 2005
Feb	40.6 mm (1.6 in)	21 February 1996
Mar	23.9 mm (0.9 in)	3 March 1989
Apr	26.7 mm (1.1 in)	9 April 2007
May	23.4 mm (0.9 in)	12 May 1995
Jun	38.1 mm (1.5 in)	17 June 1995
Jul	25.4 mm (1.0 in)	20 July 1997
Aug	34.0 mm (1.3 in)	6 August 2007
Sep	28.2 mm (1.1 in)	6 September 1981
Oct	47.8 mm (1.9 in)	7 October 2006
Nov	41.1 mm (1.6 in)	12 November 1978
Dec	27.2 mm (1.1 in)	2 December 1978

Period of Record Coverage

1978 to 2009

32 years of record at Castle Valley, 1978 to 2009. 11 years have data for under 90 percent of days and are left out of rankings: 1978, 1982, 1983, 1984, 1986, 1990, 1991, 2005 and others.

Days with data per year at Castle Valley
Year	Days with data	Share of year	Complete
1978	146	40%	No
1979	363	99%	Yes
1980	365	100%	Yes
1981	364	100%	Yes
1982	322	88%	No
1983	298	82%	No
1984	320	87%	No
1985	354	97%	Yes
1986	326	89%	No
1987	350	96%	Yes
1988	364	99%	Yes
1989	357	98%	Yes
1990	172	47%	No
1991	57	16%	No
1992	353	96%	Yes
1993	353	97%	Yes
1994	357	98%	Yes
1995	362	99%	Yes
1996	361	99%	Yes
1997	365	100%	Yes
1998	365	100%	Yes
1999	353	97%	Yes
2000	351	96%	Yes
2001	343	94%	Yes
2002	339	93%	Yes
2003	341	93%	Yes
2004	346	95%	Yes
2005	325	89%	No
2006	276	76%	No
2007	274	75%	No
2008	355	97%	Yes
2009	98	27%	No

Latest Records

No records were set at this station in the latest data.

Climate Trend

20 complete years, 1979 to 2008

One stripe for each of 20 complete years at Castle Valley, 1979 to 2008. Blue stripes are years cooler than the station's own mean of 12.5 C (54.6 F); red stripes are warmer. The coolest year was 1979, at 11.0 C (51.8 F), and the warmest was 1981, at 13.3 C (56.0 F). The strongest colour marks a difference of 1.6 C (2.9 F).

Annual mean temperature at Castle Valley as warming stripes, 1979 to 2008
Year	Annual mean temperature	Difference from the station mean
1979	11.0 C	-1.54 C
1980	12.8 C	+0.22 C
1981	13.3 C	+0.78 C
1985	12.0 C	-0.56 C
1987	11.8 C	-0.72 C
1988	12.1 C	-0.43 C
1989	12.7 C	+0.15 C
1992	12.1 C	-0.43 C
1993	11.9 C	-0.64 C
1994	13.3 C	+0.75 C
1995	12.9 C	+0.38 C
1996	13.1 C	+0.54 C
1997	11.7 C	-0.86 C
1998	12.6 C	+0.04 C
2000	13.3 C	+0.73 C
2001	13.2 C	+0.62 C
2002	12.5 C	-0.03 C
2003	13.1 C	+0.60 C
2004	12.5 C	-0.06 C
2008	13.0 C	+0.45 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

1978 to 2009

Yearly extremes at Castle Valley: the record and the median year
Measure	Record	Year of the record	Median year	Years with a value
Hottest day (TXx)	41.7 C (107.1 F)	1989	39.2 C (102.5 F)	32
Coldest night (TNn)	-25.6 C (-14.1 F)	1989	-15.0 C (5.0 F)	32
Wettest day (Rx1day)	47.8 mm (1.9 in)	2006	23.4 mm (0.9 in)	32
Wettest five days (Rx5day)	82.1 mm (3.2 in)	2006	34.4 mm (1.4 in)	32
Longest dry spell (CDD)	81 days	2006	38 days	32

Hottest day (TXx)

The hottest day of the year at Castle Valley, 1978 to 2009. The record is 41.7 C (107.1 F) in 1989, marked on the chart; the median year is 39.2 C (102.5 F).

Hottest day (TXx) at Castle Valley by year
Year	Hottest day (TXx)
1978	37.2 C (99.0 F)
1979	39.4 C (102.9 F)
1980	37.8 C (100.0 F)
1981	40.6 C (105.1 F)
1982	38.9 C (102.0 F)
1983	38.9 C (102.0 F)
1984	37.8 C (100.0 F)
1985	40.0 C (104.0 F)
1986	40.0 C (104.0 F)
1987	37.8 C (100.0 F)
1988	38.3 C (100.9 F)
1989	41.7 C (107.1 F)
1990	39.4 C (102.9 F)
1991	17.2 C (63.0 F)
1992	36.7 C (98.1 F)
1993	37.8 C (100.0 F)
1994	38.9 C (102.0 F)
1995	39.4 C (102.9 F)
1996	38.3 C (100.9 F)
1997	37.2 C (99.0 F)
1998	41.1 C (106.0 F)
1999	37.8 C (100.0 F)
2000	39.4 C (102.9 F)
2001	39.4 C (102.9 F)
2002	41.1 C (106.0 F)
2003	40.0 C (104.0 F)
2004	38.3 C (100.9 F)
2005	41.1 C (106.0 F)
2006	40.0 C (104.0 F)
2007	39.4 C (102.9 F)
2008	40.0 C (104.0 F)
2009	28.3 C (82.9 F)

Coldest night (TNn)

The coldest night of the year at Castle Valley, 1978 to 2009. The record is -25.6 C (-14.1 F) in 1989, marked on the chart; the median year is -15.0 C (5.0 F).

Coldest night (TNn) at Castle Valley by year
Year	Coldest night (TNn)
1978	-23.3 C (-9.9 F)
1979	-22.2 C (-8.0 F)
1980	-11.1 C (12.0 F)
1981	-10.6 C (12.9 F)
1982	-18.3 C (-0.9 F)
1983	-12.8 C (9.0 F)
1984	-21.7 C (-7.1 F)
1985	-19.4 C (-2.9 F)
1986	-13.3 C (8.1 F)
1987	-18.9 C (-2.0 F)
1988	-17.2 C (1.0 F)
1989	-25.6 C (-14.1 F)
1990	-16.1 C (3.0 F)
1991	-9.4 C (15.1 F)
1992	-17.2 C (1.0 F)
1993	-11.7 C (10.9 F)
1994	-12.8 C (9.0 F)
1995	-11.7 C (10.9 F)
1996	-15.0 C (5.0 F)
1997	-11.7 C (10.9 F)
1998	-20.0 C (-4.0 F)
1999	-11.7 C (10.9 F)
2000	-13.9 C (7.0 F)
2001	-12.2 C (10.0 F)
2002	-17.8 C (0.0 F)
2003	-16.1 C (3.0 F)
2004	-14.4 C (6.1 F)
2005	-15.6 C (3.9 F)
2006	-11.1 C (12.0 F)
2007	-16.7 C (1.9 F)
2008	-15.0 C (5.0 F)
2009	-13.9 C (7.0 F)

Wettest day (Rx1day)

The wettest day of the year at Castle Valley, 1978 to 2009. The record is 47.8 mm (1.9 in) in 2006, marked on the chart; the median year is 23.4 mm (0.9 in).

Wettest day (Rx1day) at Castle Valley by year
Year	Wettest day (Rx1day)
1978	41.1 mm (1.6 in)
1979	21.8 mm (0.9 in)
1980	20.6 mm (0.8 in)
1981	28.2 mm (1.1 in)
1982	21.1 mm (0.8 in)
1983	31.8 mm (1.3 in)
1984	18.5 mm (0.7 in)
1985	24.4 mm (1.0 in)
1986	36.8 mm (1.4 in)
1987	23.6 mm (0.9 in)
1988	23.4 mm (0.9 in)
1989	23.9 mm (0.9 in)
1990	14.2 mm (0.6 in)
1991	15.2 mm (0.6 in)
1992	25.4 mm (1.0 in)
1993	30.2 mm (1.2 in)
1994	17.0 mm (0.7 in)
1995	38.1 mm (1.5 in)
1996	40.6 mm (1.6 in)
1997	25.4 mm (1.0 in)
1998	20.8 mm (0.8 in)
1999	23.6 mm (0.9 in)
2000	16.3 mm (0.6 in)
2001	15.7 mm (0.6 in)
2002	17.3 mm (0.7 in)
2003	18.3 mm (0.7 in)
2004	19.8 mm (0.8 in)
2005	23.4 mm (0.9 in)
2006	47.8 mm (1.9 in)
2007	34.0 mm (1.3 in)
2008	14.7 mm (0.6 in)
2009	20.8 mm (0.8 in)

Wettest five days (Rx5day)

The wettest five days of the year at Castle Valley, 1978 to 2009. The record is 82.1 mm (3.2 in) in 2006, marked on the chart; the median year is 34.4 mm (1.4 in).

Wettest five days (Rx5day) at Castle Valley by year
Year	Wettest five days (Rx5day)
1978	46.7 mm (1.8 in)
1979	43.9 mm (1.7 in)
1980	35.3 mm (1.4 in)
1981	36.8 mm (1.4 in)
1982	50.1 mm (2.0 in)
1983	36.2 mm (1.4 in)
1984	32.1 mm (1.3 in)
1985	68.1 mm (2.7 in)
1986	36.8 mm (1.4 in)
1987	33.1 mm (1.3 in)
1988	45.0 mm (1.8 in)
1989	27.2 mm (1.1 in)
1990	21.8 mm (0.9 in)
1991	26.7 mm (1.1 in)
1992	34.8 mm (1.4 in)
1993	61.2 mm (2.4 in)
1994	30.7 mm (1.2 in)
1995	38.1 mm (1.5 in)
1996	41.4 mm (1.6 in)
1997	26.4 mm (1.0 in)
1998	43.4 mm (1.7 in)
1999	26.9 mm (1.1 in)
2000	19.5 mm (0.8 in)
2001	26.2 mm (1.0 in)
2002	31.0 mm (1.2 in)
2003	20.8 mm (0.8 in)
2004	25.7 mm (1.0 in)
2005	38.1 mm (1.5 in)
2006	82.1 mm (3.2 in)
2007	34.0 mm (1.3 in)
2008	17.5 mm (0.7 in)
2009	21.1 mm (0.8 in)

Longest dry spell (CDD)

The longest dry spell of the year at Castle Valley, 1978 to 2009. The record is 81 days in 2006, marked on the chart; the median year is 38 days.

Longest dry spell (CDD) at Castle Valley by year
Year	Longest dry spell (CDD)
1978	34 days
1979	39 days
1980	51 days
1981	32 days
1982	37 days
1983	16 days
1984	31 days
1985	33 days
1986	34 days
1987	45 days
1988	47 days
1989	56 days
1990	21 days
1991	24 days
1992	35 days
1993	24 days
1994	80 days
1995	35 days
1996	38 days
1997	38 days
1998	45 days
1999	62 days
2000	39 days
2001	38 days
2002	69 days
2003	65 days
2004	33 days
2005	41 days
2006	81 days
2007	43 days
2008	47 days
2009	24 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

20 years with a frost

Across 20 years with a frost, the median last spring frost at Castle Valley falls on 13 April and the median first autumn frost on 23 October, which leaves a median of 193 days between them.

Frost dates and growing season at Castle Valley
Measure	Median, all years	Earliest period	Recent period (1979 to 2008)	Recent against earliest	Fitted trend
Last spring frost	13 April	n/a	13 April	n/a	n/a
First autumn frost	23 October	n/a	23 October	n/a	n/a
Growing days	193 days	n/a	193 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.

Download the Data

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