Thiokol Propulsion F S Weather Records (USC00428668)

Record envelope, standing records and threshold days for Thiokol Propulsion F S (USC00428668), Utah, United States, with 48 years of record.

Key Facts for Thiokol Propulsion F S

Thiokol Propulsion F S (USC00428668) is a weather station in Utah, United States at 41.72 latitude and -112.43 longitude, 1,402 m (4,600 ft) above sea level.
The station reports from 1962 to 2009, 48 years of record.
1,464 records set at Thiokol Propulsion F S still stand.
Records are tracked for tmax, tmin, prcp, snow, snwd: an element needs 30 years of data to be eligible.
Thiokol Propulsion F S set a daily record high maximum temperature of 8.9 C (48.0 F) on 19 December 2009.

About the Station

Location: Utah, United States, 41.72 latitude, -112.43 longitude.
Elevation: 1,402 m (4,600 ft).
Period of record: 1962 to 2009, 48 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 Thiokol Propulsion F 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 Thiokol Propulsion F S, with 2026 drawn through them
Month	Highest record high	Lowest record low	2026 highest maximum	2026 lowest minimum
Jan	13.3 C (55.9 F)	-33.3 C (-27.9 F)	n/a	n/a
Feb	18.3 C (64.9 F)	-33.9 C (-29.0 F)	n/a	n/a
Mar	23.3 C (73.9 F)	-20.6 C (-5.1 F)	n/a	n/a
Apr	29.4 C (84.9 F)	-12.2 C (10.0 F)	n/a	n/a
May	35.6 C (96.1 F)	-9.4 C (15.1 F)	n/a	n/a
Jun	39.4 C (102.9 F)	-1.7 C (28.9 F)	n/a	n/a
Jul	42.2 C (108.0 F)	1.7 C (35.1 F)	n/a	n/a
Aug	41.7 C (107.1 F)	-1.1 C (30.0 F)	n/a	n/a
Sep	36.7 C (98.1 F)	-6.7 C (19.9 F)	n/a	n/a
Oct	31.1 C (88.0 F)	-12.2 C (10.0 F)	n/a	n/a
Nov	25.6 C (78.1 F)	-27.2 C (-17.0 F)	n/a	n/a
Dec	15.6 C (60.1 F)	-32.8 C (-27.0 F)	n/a	n/a

Which Years Hold Standing Records

1,464 standing records

1,464 records at Thiokol Propulsion F S still stand. 1964 holds the most, with 89.

Standing records at Thiokol Propulsion F S by the year they were set
Year set	Standing records
1962	21
1963	32
1964	89
1965	42
1966	34
1967	21
1968	30
1969	30
1970	36
1971	25
1972	38
1973	16
1974	26
1975	35
1976	20
1977	33
1978	48
1979	36
1980	21
1981	17
1982	35
1983	25
1984	28
1985	37
1986	38
1987	24
1988	34
1989	26
1990	43
1991	19
1992	31
1993	33
1994	29
1995	34
1996	34
1997	32
1998	24
1999	29
2000	47
2001	36
2002	21
2003	33
2004	26
2005	12
2006	18
2007	20
2008	19
2009	27

All-Time Record Progression

3 new records

3 all-time records were set at Thiokol Propulsion F S between 23 July 2000 and 14 July 2002. Each dot is a new record.

When Thiokol Propulsion F S set new all-time records
Date	Kind	Detail
2000-07-23	Record high maximum temperature	Record high maximum temperature 40.6 C (105.1 F)
2000-08-02	Record high maximum temperature	Record high maximum temperature 41.7 C (107.1 F)
2002-07-14	Record high maximum temperature	Record high maximum temperature 42.2 C (108.0 F)

Wettest Day of Each Month

Aug: 62.2 mm (2.4 in)

The wettest day on record for each calendar month at Thiokol Propulsion F S. The most was 62.2 mm (2.4 in) on 18 August 1977.

Record daily precipitation for each month at Thiokol Propulsion F S
Month	Record daily precipitation (mm)	Date
Jan	27.9 mm (1.1 in)	8 January 2005
Feb	31.8 mm (1.3 in)	9 February 1976
Mar	39.6 mm (1.6 in)	25 March 1975
Apr	29.2 mm (1.1 in)	7 April 2001
May	40.9 mm (1.6 in)	28 May 2004
Jun	49.8 mm (2.0 in)	7 June 1964
Jul	29.2 mm (1.1 in)	24 July 1998
Aug	62.2 mm (2.4 in)	18 August 1977
Sep	57.4 mm (2.3 in)	26 September 1982
Oct	45.5 mm (1.8 in)	30 October 1963
Nov	30.2 mm (1.2 in)	12 November 1994
Dec	25.4 mm (1.0 in)	1 December 1983

Period of Record Coverage

1962 to 2009

48 years of record at Thiokol Propulsion F S, 1962 to 2009. 15 years have data for under 90 percent of days and are left out of rankings: 1962, 1973, 1991, 1993, 1995, 1996, 1997, 1998 and others.

Days with data per year at Thiokol Propulsion F S
Year	Days with data	Share of year	Complete
1962	195	53%	No
1963	345	95%	Yes
1964	360	98%	Yes
1965	356	98%	Yes
1966	361	99%	Yes
1967	364	100%	Yes
1968	365	100%	Yes
1969	364	100%	Yes
1970	363	99%	Yes
1971	364	100%	Yes
1972	364	99%	Yes
1973	272	75%	No
1974	362	99%	Yes
1975	364	100%	Yes
1976	364	99%	Yes
1977	364	100%	Yes
1978	364	100%	Yes
1979	362	99%	Yes
1980	366	100%	Yes
1981	362	99%	Yes
1982	355	97%	Yes
1983	350	96%	Yes
1984	352	96%	Yes
1985	348	95%	Yes
1986	356	98%	Yes
1987	353	97%	Yes
1988	350	96%	Yes
1989	339	93%	Yes
1990	339	93%	Yes
1991	322	88%	No
1992	330	90%	Yes
1993	315	86%	No
1994	331	91%	Yes
1995	315	86%	No
1996	313	86%	No
1997	319	87%	No
1998	313	86%	No
1999	310	85%	No
2000	309	84%	No
2001	325	89%	No
2002	196	54%	No
2003	340	93%	Yes
2004	363	99%	Yes
2005	330	90%	Yes
2006	364	100%	Yes
2007	206	56%	No
2008	132	36%	No
2009	152	42%	No

Latest Records

Latest records at Thiokol Propulsion F S
Date	Station	Record	Value	Beat old record by	Old record stood	Significance
19 December 2009	Thiokol Propulsion F S, US	daily high max	8.9 C (48.0 F)	1.1 C (2.0 F)	23 years	12 of 100 (Routine)
18 December 2009	Thiokol Propulsion F S, US	daily high max	9.4 C (48.9 F)	1.1 C (2.0 F)	47 years	20 of 100 (Routine)
17 December 2009	Thiokol Propulsion F S, US	daily high min	1.1 C (34.0 F)	1.7 C (3.1 F)	7 years	8 of 100 (Routine)
15 December 2009	Thiokol Propulsion F S, US	daily high max (Tie)	10.0 C (50.0 F)	tie	7 years	1 of 100 (Routine)
14 December 2009	Thiokol Propulsion F S, US	daily high min	2.2 C (36.0 F)	1.1 C (2.0 F)	28 years	13 of 100 (Routine)
13 December 2009	Thiokol Propulsion F S, US	daily snowfall	15.2 cm (6.0 in)	5.0 cm (2.0 in)	35 years	26 of 100 (Routine)
13 December 2009	Thiokol Propulsion F S, US	daily rain	9.9 mm (0.39 in)	3.0 mm (0.12 in)	35 years	20 of 100 (Routine)
30 November 2009	Thiokol Propulsion F S, US	daily high max	14.4 C (57.9 F)	2.2 C (4.0 F)	14 years	12 of 100 (Routine)
28 November 2009	Thiokol Propulsion F S, US	daily high max (Tie)	12.2 C (54.0 F)	tie	10 years	1 of 100 (Routine)
27 November 2009	Thiokol Propulsion F S, US	daily high max	12.8 C (55.0 F)	1.7 C (3.1 F)	10 years	10 of 100 (Routine)
23 November 2009	Thiokol Propulsion F S, US	daily rain	25.7 mm (1.0 in)	14.3 mm (0.6 in)	8 years	35 of 100 (Notable)
19 November 2009	Thiokol Propulsion F S, US	daily high max (Tie)	16.7 C (62.1 F)	tie	2 years	1 of 100 (Routine)
17 November 2009	Thiokol Propulsion F S, US	daily high max	21.1 C (70.0 F)	5.5 C (9.9 F)	35 years	24 of 100 (Routine)
11 November 2009	Thiokol Propulsion F S, US	monthly high max	25.6 C (78.1 F)	3.4 C (6.1 F)	10 years	23 of 100 (Routine)
11 November 2009	Thiokol Propulsion F S, US	daily high min	3.3 C (37.9 F)	1.1 C (2.0 F)	28 years	14 of 100 (Routine)
8 November 2009	Thiokol Propulsion F S, US	daily high max (Tie)	20.0 C (68.0 F)	tie	28 years	3 of 100 (Routine)
7 November 2009	Thiokol Propulsion F S, US	daily high max (Tie)	21.1 C (70.0 F)	tie	28 years	3 of 100 (Routine)
6 November 2009	Thiokol Propulsion F S, US	monthly high max (Tie)	22.2 C (72.0 F)	tie	10 years	4 of 100 (Routine)
5 November 2009	Thiokol Propulsion F S, US	monthly high max (Tie)	22.2 C (72.0 F)	tie	9 years	4 of 100 (Routine)
2 November 2009	Thiokol Propulsion F S, US	daily high max	20.6 C (69.1 F)	2.3 C (4.1 F)	31 years	17 of 100 (Routine)

Climate Trend

39 complete years, 1964 to 2006

One stripe for each of 39 complete years at Thiokol Propulsion F S, 1964 to 2006. Blue stripes are years cooler than the station's own mean of 8.5 C (47.2 F); red stripes are warmer. The coolest year was 1964, at 6.0 C (42.7 F), and the warmest was 1981, at 10.0 C (50.0 F). The strongest colour marks a difference of 2.6 C (4.7 F).

Annual mean temperature at Thiokol Propulsion F S as warming stripes, 1964 to 2006
Year	Annual mean temperature	Difference from the station mean
1964	6.0 C	-2.51 C
1965	8.0 C	-0.43 C
1966	8.5 C	+0.04 C
1967	8.2 C	-0.31 C
1968	7.3 C	-1.18 C
1969	8.6 C	+0.11 C
1970	8.3 C	-0.20 C
1971	7.8 C	-0.70 C
1972	8.6 C	+0.18 C
1974	8.5 C	0.00 C
1975	7.1 C	-1.35 C
1976	7.8 C	-0.67 C
1977	9.1 C	+0.67 C
1978	8.8 C	+0.30 C
1979	7.8 C	-0.68 C
1980	9.1 C	+0.59 C
1981	10.0 C	+1.53 C
1982	7.4 C	-1.07 C
1983	8.4 C	-0.04 C
1984	6.8 C	-1.67 C
1985	7.0 C	-1.44 C
1986	9.0 C	+0.49 C
1987	9.0 C	+0.55 C
1988	8.9 C	+0.47 C
1989	8.5 C	+0.01 C
1990	9.0 C	+0.57 C
1991	7.9 C	-0.55 C
1992	9.4 C	+0.92 C
1993	7.1 C	-1.34 C
1994	9.7 C	+1.27 C
1995	9.5 C	+1.00 C
1996	9.4 C	+0.97 C
1997	8.6 C	+0.09 C
1998	9.3 C	+0.81 C
1999	10.0 C	+1.52 C
2001	9.6 C	+1.11 C
2003	9.7 C	+1.27 C
2004	7.7 C	-0.72 C
2006	9.0 C	+0.53 C

The annual mean temperature here has risen by 0.4 C (0.1 to 0.6) per decade over 1964 to 2006. In Fahrenheit: 0.7 F (0.3 to 1.1) per decade. The slope is a straight line fitted to 39 complete years; the brackets give its 95 percent interval.

Fitted temperature trends per decade at Thiokol Propulsion F S
Measure	Per decade (C)	Per decade (F)	Period	Complete years	Reading
Annual mean temperature	0.4 C (0.1 to 0.6) per decade	0.7 F (0.3 to 1.1) per decade	1964 to 2006	39	Rise
Mean daily maximum	0.4 C (0.1 to 0.7) per decade	0.6 F (0.1 to 1.2) per decade	1964 to 2006	39	Rise
Mean daily minimum	0.4 C (0.2 to 0.6) per decade	0.7 F (0.3 to 1.2) per decade	1964 to 2006	39	Rise

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

1962 to 2009

Yearly extremes at Thiokol Propulsion F S: the record and the median year
Measure	Record	Year of the record	Median year	Years with a value
Hottest day (TXx)	42.2 C (108.0 F)	2002	37.8 C (100.0 F)	48
Coldest night (TNn)	-33.9 C (-29.0 F)	1982	-23.6 C (-10.5 F)	48
Wettest day (Rx1day)	62.2 mm (2.4 in)	1977	28.3 mm (1.1 in)	48
Wettest five days (Rx5day)	93.5 mm (3.7 in)	1982	50.2 mm (2.0 in)	48
Longest dry spell (CDD)	89 days	1976	43 days	48

Hottest day (TXx)

The hottest day of the year at Thiokol Propulsion F S, 1962 to 2009. The record is 42.2 C (108.0 F) in 2002, marked on the chart; the median year is 37.8 C (100.0 F).

Hottest day (TXx) at Thiokol Propulsion F S by year
Year	Hottest day (TXx)
1962	37.8 C (100.0 F)
1963	38.9 C (102.0 F)
1964	35.6 C (96.1 F)
1965	35.6 C (96.1 F)
1966	37.2 C (99.0 F)
1967	35.6 C (96.1 F)
1968	36.7 C (98.1 F)
1969	36.7 C (98.1 F)
1970	39.4 C (102.9 F)
1971	37.2 C (99.0 F)
1972	38.9 C (102.0 F)
1973	38.3 C (100.9 F)
1974	37.8 C (100.0 F)
1975	37.2 C (99.0 F)
1976	39.4 C (102.9 F)
1977	37.2 C (99.0 F)
1978	38.3 C (100.9 F)
1979	37.8 C (100.0 F)
1980	36.7 C (98.1 F)
1981	37.2 C (99.0 F)
1982	37.2 C (99.0 F)
1983	37.8 C (100.0 F)
1984	34.4 C (93.9 F)
1985	38.3 C (100.9 F)
1986	36.7 C (98.1 F)
1987	37.2 C (99.0 F)
1988	38.9 C (102.0 F)
1989	38.9 C (102.0 F)
1990	40.0 C (104.0 F)
1991	38.3 C (100.9 F)
1992	38.9 C (102.0 F)
1993	36.7 C (98.1 F)
1994	37.8 C (100.0 F)
1995	37.8 C (100.0 F)
1996	38.3 C (100.9 F)
1997	35.6 C (96.1 F)
1998	39.4 C (102.9 F)
1999	37.8 C (100.0 F)
2000	41.7 C (107.1 F)
2001	39.4 C (102.9 F)
2002	42.2 C (108.0 F)
2003	40.0 C (104.0 F)
2004	36.1 C (97.0 F)
2005	41.1 C (106.0 F)
2006	38.9 C (102.0 F)
2007	38.9 C (102.0 F)
2008	32.2 C (90.0 F)
2009	41.1 C (106.0 F)

Coldest night (TNn)

The coldest night of the year at Thiokol Propulsion F S, 1962 to 2009. The record is -33.9 C (-29.0 F) in 1982, marked on the chart; the median year is -23.6 C (-10.5 F).

Coldest night (TNn) at Thiokol Propulsion F S by year
Year	Coldest night (TNn)
1962	-21.7 C (-7.1 F)
1963	-28.9 C (-20.0 F)
1964	-30.0 C (-22.0 F)
1965	-18.3 C (-0.9 F)
1966	-22.2 C (-8.0 F)
1967	-22.8 C (-9.0 F)
1968	-25.6 C (-14.1 F)
1969	-21.7 C (-7.1 F)
1970	-25.6 C (-14.1 F)
1971	-26.7 C (-16.1 F)
1972	-32.8 C (-27.0 F)
1973	-27.8 C (-18.0 F)
1974	-27.2 C (-17.0 F)
1975	-29.4 C (-20.9 F)
1976	-21.7 C (-7.1 F)
1977	-26.1 C (-15.0 F)
1978	-26.1 C (-15.0 F)
1979	-31.1 C (-24.0 F)
1980	-23.9 C (-11.0 F)
1981	-17.8 C (0.0 F)
1982	-33.9 C (-29.0 F)
1983	-28.3 C (-18.9 F)
1984	-33.3 C (-27.9 F)
1985	-31.1 C (-24.0 F)
1986	-22.2 C (-8.0 F)
1987	-23.3 C (-9.9 F)
1988	-27.8 C (-18.0 F)
1989	-30.6 C (-23.1 F)
1990	-31.7 C (-25.1 F)
1991	-28.3 C (-18.9 F)
1992	-23.3 C (-9.9 F)
1993	-24.4 C (-11.9 F)
1994	-23.3 C (-9.9 F)
1995	-16.7 C (1.9 F)
1996	-25.6 C (-14.1 F)
1997	-17.2 C (1.0 F)
1998	-20.0 C (-4.0 F)
1999	-14.4 C (6.1 F)
2000	-20.6 C (-5.1 F)
2001	-22.2 C (-8.0 F)
2002	-19.4 C (-2.9 F)
2003	-15.0 C (5.0 F)
2004	-24.4 C (-11.9 F)
2005	-20.6 C (-5.1 F)
2006	-18.3 C (-0.9 F)
2007	-20.6 C (-5.1 F)
2008	-22.8 C (-9.0 F)
2009	-19.4 C (-2.9 F)

Wettest day (Rx1day)

The wettest day of the year at Thiokol Propulsion F S, 1962 to 2009. The record is 62.2 mm (2.4 in) in 1977, marked on the chart; the median year is 28.3 mm (1.1 in).

Wettest day (Rx1day) at Thiokol Propulsion F S by year
Year	Wettest day (Rx1day)
1962	17.8 mm (0.7 in)
1963	45.5 mm (1.8 in)
1964	49.8 mm (2.0 in)
1965	24.9 mm (1.0 in)
1966	36.1 mm (1.4 in)
1967	23.1 mm (0.9 in)
1968	26.7 mm (1.1 in)
1969	21.6 mm (0.9 in)
1970	23.1 mm (0.9 in)
1971	28.4 mm (1.1 in)
1972	32.5 mm (1.3 in)
1973	41.7 mm (1.6 in)
1974	23.6 mm (0.9 in)
1975	39.6 mm (1.6 in)
1976	33.0 mm (1.3 in)
1977	62.2 mm (2.4 in)
1978	23.9 mm (0.9 in)
1979	25.4 mm (1.0 in)
1980	28.2 mm (1.1 in)
1981	25.1 mm (1.0 in)
1982	57.4 mm (2.3 in)
1983	30.5 mm (1.2 in)
1984	29.5 mm (1.2 in)
1985	16.8 mm (0.7 in)
1986	26.2 mm (1.0 in)
1987	23.1 mm (0.9 in)
1988	33.0 mm (1.3 in)
1989	20.3 mm (0.8 in)
1990	33.0 mm (1.3 in)
1991	29.7 mm (1.2 in)
1992	22.9 mm (0.9 in)
1993	26.7 mm (1.1 in)
1994	43.7 mm (1.7 in)
1995	32.5 mm (1.3 in)
1996	33.0 mm (1.3 in)
1997	32.5 mm (1.3 in)
1998	29.2 mm (1.1 in)
1999	26.7 mm (1.1 in)
2000	25.9 mm (1.0 in)
2001	29.2 mm (1.1 in)
2002	21.3 mm (0.8 in)
2003	20.3 mm (0.8 in)
2004	40.9 mm (1.6 in)
2005	34.8 mm (1.4 in)
2006	44.5 mm (1.8 in)
2007	9.1 mm (0.36 in)
2008	11.2 mm (0.4 in)
2009	25.7 mm (1.0 in)

Wettest five days (Rx5day)

The wettest five days of the year at Thiokol Propulsion F S, 1962 to 2009. The record is 93.5 mm (3.7 in) in 1982, marked on the chart; the median year is 50.2 mm (2.0 in).

Wettest five days (Rx5day) at Thiokol Propulsion F S by year
Year	Wettest five days (Rx5day)
1962	18.1 mm (0.7 in)
1963	45.5 mm (1.8 in)
1964	58.6 mm (2.3 in)
1965	57.7 mm (2.3 in)
1966	40.2 mm (1.6 in)
1967	52.3 mm (2.1 in)
1968	63.3 mm (2.5 in)
1969	37.9 mm (1.5 in)
1970	40.1 mm (1.6 in)
1971	38.4 mm (1.5 in)
1972	38.6 mm (1.5 in)
1973	64.1 mm (2.5 in)
1974	32.0 mm (1.3 in)
1975	52.6 mm (2.1 in)
1976	35.3 mm (1.4 in)
1977	64.9 mm (2.6 in)
1978	49.6 mm (2.0 in)
1979	47.2 mm (1.9 in)
1980	60.7 mm (2.4 in)
1981	56.3 mm (2.2 in)
1982	93.5 mm (3.7 in)
1983	60.3 mm (2.4 in)
1984	42.9 mm (1.7 in)
1985	24.4 mm (1.0 in)
1986	51.3 mm (2.0 in)
1987	50.7 mm (2.0 in)
1988	33.0 mm (1.3 in)
1989	27.9 mm (1.1 in)
1990	58.6 mm (2.3 in)
1991	38.3 mm (1.5 in)
1992	39.7 mm (1.6 in)
1993	46.4 mm (1.8 in)
1994	52.9 mm (2.1 in)
1995	58.3 mm (2.3 in)
1996	41.4 mm (1.6 in)
1997	73.7 mm (2.9 in)
1998	65.6 mm (2.6 in)
1999	70.4 mm (2.8 in)
2000	31.3 mm (1.2 in)
2001	52.1 mm (2.1 in)
2002	56.4 mm (2.2 in)
2003	34.6 mm (1.4 in)
2004	75.2 mm (3.0 in)
2005	84.3 mm (3.3 in)
2006	50.9 mm (2.0 in)
2007	19.0 mm (0.7 in)
2008	20.4 mm (0.8 in)
2009	25.7 mm (1.0 in)

Longest dry spell (CDD)

The longest dry spell of the year at Thiokol Propulsion F S, 1962 to 2009. The record is 89 days in 1976, marked on the chart; the median year is 43 days.

Longest dry spell (CDD) at Thiokol Propulsion F S by year
Year	Longest dry spell (CDD)
1962	51 days
1963	66 days
1964	51 days
1965	45 days
1966	42 days
1967	51 days
1968	51 days
1969	52 days
1970	48 days
1971	61 days
1972	51 days
1973	31 days
1974	61 days
1975	26 days
1976	89 days
1977	32 days
1978	43 days
1979	38 days
1980	43 days
1981	36 days
1982	24 days
1983	20 days
1984	20 days
1985	33 days
1986	39 days
1987	38 days
1988	49 days
1989	79 days
1990	28 days
1991	45 days
1992	49 days
1993	40 days
1994	82 days
1995	41 days
1996	45 days
1997	39 days
1998	30 days
1999	53 days
2000	52 days
2001	52 days
2002	33 days
2003	33 days
2004	26 days
2005	65 days
2006	44 days
2007	31 days
2008	34 days
2009	29 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

39 years with a frost

Across 39 years with a frost, the median last spring frost at Thiokol Propulsion F S falls on 20 May and the median first autumn frost on 20 September, which leaves a median of 121 days between them.

Fitted over all years, the growing season changes by +3.5 days per decade at this station.

Frost dates and growing season at Thiokol Propulsion F S
Measure	Median, all years	Earliest period	Recent period (1974 to 2006)	Recent against earliest	Fitted trend
Last spring frost	20 May	n/a	21 May	n/a	-1.3 days per decade
First autumn frost	20 September	n/a	22 September	n/a	+2.2 days per decade
Growing days	121 days	n/a	125 days	n/a	+3.5 days per decade

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

41 years, 1963 to 2006

A day with at least 28.7 mm (1.1 in) of rain is expected about once in 2 years. A day with at least 70.1 mm (2.8 in) of rain is expected about once in 100 years.

Rainfall return levels at Thiokol Propulsion F 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	28.7 mm (1.1 in)
5 years	37.0 mm (1.5 in)
10 years	43.5 mm (1.7 in)
25 years	53.0 mm (2.1 in)
50 years	61.1 mm (2.4 in)	Longer than the 41 years of record
100 years	70.1 mm (2.8 in)	Longer than the 41 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, 41 years of values from 1963 to 2006.

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: 62.2 mm (2.4 in) in 1977; 57.4 mm (2.3 in) in 1982; 49.8 mm (2.0 in) in 1964.

Download the Data

Data for Thiokol Propulsion F S standing records by year: CSV or JSON. Field meanings are on the data page.
Data for Thiokol Propulsion F 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 2026-10-13 (13 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).