Nampa Sugar Factory Weather Records (USC00106305)

Record envelope, standing records and threshold days for Nampa Sugar Factory (USC00106305), Idaho, United States, with 40 years of record.

Key Facts for Nampa Sugar Factory

Nampa Sugar Factory (USC00106305) is a weather station in Idaho, United States at 43.60 latitude and -116.58 longitude, 753 m (2,470 ft) above sea level.
The station reports from 1976 to 2015, 40 years of record.
1,464 records set at Nampa Sugar Factory still stand.
Records are tracked for tmax, tmin, prcp, snow, snwd: an element needs 30 years of data to be eligible.
Nampa Sugar Factory set a daily record high maximum temperature of 40.0 C (104.0 F) on 3 August 2015.

About the Station

Location: Idaho, United States, 43.60 latitude, -116.58 longitude.
Elevation: 753 m (2,470 ft).
Period of record: 1976 to 2015, 40 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 Nampa Sugar Factory. 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 Nampa Sugar Factory, with 2026 drawn through them
Month	Highest record high	Lowest record low	2026 highest maximum	2026 lowest minimum
Jan	15.6 C (60.1 F)	-28.9 C (-20.0 F)	n/a	n/a
Feb	21.1 C (70.0 F)	-29.4 C (-20.9 F)	n/a	n/a
Mar	27.2 C (81.0 F)	-10.6 C (12.9 F)	n/a	n/a
Apr	33.9 C (93.0 F)	-7.8 C (18.0 F)	n/a	n/a
May	37.8 C (100.0 F)	-3.3 C (26.1 F)	n/a	n/a
Jun	42.8 C (109.0 F)	0.6 C (33.1 F)	n/a	n/a
Jul	42.8 C (109.0 F)	3.3 C (37.9 F)	n/a	n/a
Aug	41.7 C (107.1 F)	2.2 C (36.0 F)	n/a	n/a
Sep	38.3 C (100.9 F)	-2.2 C (28.0 F)	n/a	n/a
Oct	34.4 C (93.9 F)	-9.4 C (15.1 F)	n/a	n/a
Nov	23.3 C (73.9 F)	-19.4 C (-2.9 F)	n/a	n/a
Dec	18.3 C (64.9 F)	-32.2 C (-26.0 F)	n/a	n/a

Which Years Hold Standing Records

1,464 standing records

1,464 records at Nampa Sugar Factory still stand. 1985 holds the most, with 83.

Standing records at Nampa Sugar Factory by the year they were set
Year set	Standing records
1976	4
1977	43
1978	47
1979	54
1980	48
1981	31
1982	36
1983	34
1984	50
1985	83
1986	51
1987	48
1988	41
1989	46
1990	58
1991	31
1992	42
1993	54
1994	27
1995	41
1996	44
1997	29
1998	38
1999	32
2000	19
2001	35
2002	42
2003	51
2004	21
2005	11
2006	30
2007	27
2008	19
2009	31
2010	9
2011	28
2012	32
2013	24
2014	36
2015	37

All-Time Record Progression

1 new records

1 all-time records were set at Nampa Sugar Factory between 5 June 2015 and 5 June 2015. Each dot is a new record.

Wettest Day of Each Month

Jun: 45.7 mm (1.8 in)

The wettest day on record for each calendar month at Nampa Sugar Factory. The most was 45.7 mm (1.8 in) on 5 June 2015.

Record daily precipitation for each month at Nampa Sugar Factory
Month	Record daily precipitation (mm)	Date
Jan	27.4 mm (1.1 in)	11 January 1979
Feb	20.3 mm (0.8 in)	13 February 1995
Mar	26.4 mm (1.0 in)	26 March 2011
Apr	35.1 mm (1.4 in)	24 April 1980
May	25.4 mm (1.0 in)	23 May 2010
Jun	45.7 mm (1.8 in)	5 June 2015
Jul	45.7 mm (1.8 in)	13 July 2015
Aug	23.6 mm (0.9 in)	23 August 2003
Sep	42.9 mm (1.7 in)	11 September 1980
Oct	26.4 mm (1.0 in)	13 October 2000
Nov	24.4 mm (1.0 in)	2 November 2014
Dec	21.6 mm (0.9 in)	29 December 2010

Period of Record Coverage

1976 to 2015

40 years of record at Nampa Sugar Factory, 1976 to 2015. 5 years have data for under 90 percent of days and are left out of rankings: 1976, 1980, 1981, 2013, 2015.

Days with data per year at Nampa Sugar Factory
Year	Days with data	Share of year	Complete
1976	92	25%	No
1977	335	92%	Yes
1978	329	90%	Yes
1979	364	100%	Yes
1980	275	75%	No
1981	273	75%	No
1982	365	100%	Yes
1983	365	100%	Yes
1984	366	100%	Yes
1985	335	92%	Yes
1986	365	100%	Yes
1987	365	100%	Yes
1988	366	100%	Yes
1989	364	100%	Yes
1990	365	100%	Yes
1991	360	99%	Yes
1992	364	99%	Yes
1993	363	99%	Yes
1994	365	100%	Yes
1995	335	92%	Yes
1996	335	92%	Yes
1997	334	92%	Yes
1998	365	100%	Yes
1999	365	100%	Yes
2000	336	92%	Yes
2001	364	100%	Yes
2002	365	100%	Yes
2003	365	100%	Yes
2004	365	100%	Yes
2005	335	92%	Yes
2006	365	100%	Yes
2007	365	100%	Yes
2008	364	99%	Yes
2009	354	97%	Yes
2010	364	100%	Yes
2011	365	100%	Yes
2012	366	100%	Yes
2013	212	58%	No
2014	364	100%	Yes
2015	210	58%	No

Latest Records

Latest records at Nampa Sugar Factory
Date	Station	Record	Value	Beat old record by	Old record stood	Significance
3 August 2015	Nampa Sugar Factory, US	daily high max	40.0 C (104.0 F)	0.6 C (1.1 F)	5 years	6 of 100 (Routine)
2 August 2015	Nampa Sugar Factory, US	daily high max	39.4 C (102.9 F)	0.5 C (0.9 F)	12 years	8 of 100 (Routine)
1 August 2015	Nampa Sugar Factory, US	daily high max (Tie)	38.9 C (102.0 F)	tie	22 years	2 of 100 (Routine)
29 July 2015	Nampa Sugar Factory, US	daily low min	10.0 C (50.0 F)	1.7 C (3.1 F)	36 years	19 of 100 (Routine)
29 July 2015	Nampa Sugar Factory, US	daily low max	27.8 C (82.0 F)	1.1 C (2.0 F)	17 years	11 of 100 (Routine)
28 July 2015	Nampa Sugar Factory, US	daily low max	25.6 C (78.1 F)	2.7 C (4.9 F)	30 years	19 of 100 (Routine)
28 July 2015	Nampa Sugar Factory, US	daily low min	10.6 C (51.1 F)	0.5 C (0.9 F)	34 years	15 of 100 (Routine)
24 July 2015	Nampa Sugar Factory, US	daily rain	0.3 mm (0.01 in)	0.3 mm (0.01 in)	37 years	15 of 100 (Routine)
22 July 2015	Nampa Sugar Factory, US	daily high min (Tie)	19.4 C (66.9 F)	tie	8 years	1 of 100 (Routine)
13 July 2015	Nampa Sugar Factory, US	all-time rain (Tie)	45.7 mm (1.8 in)	tie	0 years	6 of 100 (Routine)
12 July 2015	Nampa Sugar Factory, US	daily rain	2.8 mm (0.11 in)	1.3 mm (0.05 in)	29 years	15 of 100 (Routine)
8 July 2015	Nampa Sugar Factory, US	daily high min	19.4 C (66.9 F)	1.1 C (2.0 F)	12 years	10 of 100 (Routine)
7 July 2015	Nampa Sugar Factory, US	daily high min	21.7 C (71.1 F)	1.7 C (3.1 F)	29 years	17 of 100 (Routine)
1 July 2015	Nampa Sugar Factory, US	daily high min	21.7 C (71.1 F)	1.7 C (3.1 F)	6 years	11 of 100 (Routine)
1 July 2015	Nampa Sugar Factory, US	daily high max	40.0 C (104.0 F)	0.6 C (1.1 F)	1 year	5 of 100 (Routine)
30 June 2015	Nampa Sugar Factory, US	all-time high min (Tie)	22.8 C (73.0 F)	tie	30 years	8 of 100 (Routine)
30 June 2015	Nampa Sugar Factory, US	daily high max	40.6 C (105.1 F)	1.2 C (2.2 F)	1 year	6 of 100 (Routine)
29 June 2015	Nampa Sugar Factory, US	all-time high max (Tie)	42.8 C (109.0 F)	tie	12 years	6 of 100 (Routine)
28 June 2015	Nampa Sugar Factory, US	monthly high max	40.0 C (104.0 F)	0.6 C (1.1 F)	27 years	23 of 100 (Routine)
28 June 2015	Nampa Sugar Factory, US	daily high min	20.0 C (68.0 F)	0.6 C (1.1 F)	8 years	7 of 100 (Routine)

Climate Trend

27 complete years, 1979 to 2014

One stripe for each of 27 complete years at Nampa Sugar Factory, 1979 to 2014. Blue stripes are years cooler than the station's own mean of 10.9 C (51.6 F); red stripes are warmer. The coolest year was 1979, at 9.1 C (48.3 F), and the warmest was 2003, at 12.4 C (54.3 F). The strongest colour marks a difference of 1.8 C (3.2 F).

Annual mean temperature at Nampa Sugar Factory as warming stripes, 1979 to 2014
Year	Annual mean temperature	Difference from the station mean
1979	9.1 C	-1.78 C
1982	9.4 C	-1.50 C
1983	10.6 C	-0.31 C
1984	9.2 C	-1.67 C
1986	11.1 C	+0.19 C
1987	11.4 C	+0.49 C
1988	10.9 C	0.00 C
1989	9.7 C	-1.17 C
1990	10.6 C	-0.23 C
1991	10.3 C	-0.59 C
1992	11.4 C	+0.49 C
1993	9.4 C	-1.50 C
1994	11.1 C	+0.25 C
1998	11.7 C	+0.81 C
1999	11.1 C	+0.28 C
2001	11.3 C	+0.48 C
2002	11.1 C	+0.20 C
2003	12.4 C	+1.54 C
2004	11.4 C	+0.56 C
2006	11.8 C	+0.89 C
2007	11.8 C	+0.97 C
2008	10.9 C	0.00 C
2009	10.8 C	-0.02 C
2010	11.0 C	+0.12 C
2011	10.3 C	-0.56 C
2012	12.1 C	+1.19 C
2014	11.8 C	+0.97 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

1976 to 2015

Yearly extremes at Nampa Sugar Factory: the record and the median year
Measure	Record	Year of the record	Median year	Years with a value
Hottest day (TXx)	42.8 C (109.0 F)	2002	39.4 C (102.9 F)	40
Coldest night (TNn)	-32.2 C (-26.0 F)	1990	-16.1 C (3.0 F)	40
Wettest day (Rx1day)	45.7 mm (1.8 in)	2015	20.6 mm (0.8 in)	40
Wettest five days (Rx5day)	68.8 mm (2.7 in)	1980	32.1 mm (1.3 in)	40
Longest dry spell (CDD)	87 days	1987	45 days	40

Hottest day (TXx)

The hottest day of the year at Nampa Sugar Factory, 1976 to 2015. The record is 42.8 C (109.0 F) in 2002, marked on the chart; the median year is 39.4 C (102.9 F).

Hottest day (TXx) at Nampa Sugar Factory by year
Year	Hottest day (TXx)
1976	28.3 C (82.9 F)
1977	37.8 C (100.0 F)
1978	40.0 C (104.0 F)
1979	39.4 C (102.9 F)
1980	39.4 C (102.9 F)
1981	36.7 C (98.1 F)
1982	37.8 C (100.0 F)
1983	40.0 C (104.0 F)
1984	40.0 C (104.0 F)
1985	38.3 C (100.9 F)
1986	39.4 C (102.9 F)
1987	37.8 C (100.0 F)
1988	39.4 C (102.9 F)
1989	39.4 C (102.9 F)
1990	41.7 C (107.1 F)
1991	39.4 C (102.9 F)
1992	38.9 C (102.0 F)
1993	37.2 C (99.0 F)
1994	40.6 C (105.1 F)
1995	38.3 C (100.9 F)
1996	40.6 C (105.1 F)
1997	38.9 C (102.0 F)
1998	41.7 C (107.1 F)
1999	38.3 C (100.9 F)
2000	38.9 C (102.0 F)
2001	40.6 C (105.1 F)
2002	42.8 C (109.0 F)
2003	42.8 C (109.0 F)
2004	39.4 C (102.9 F)
2005	41.1 C (106.0 F)
2006	42.2 C (108.0 F)
2007	40.6 C (105.1 F)
2008	39.4 C (102.9 F)
2009	40.0 C (104.0 F)
2010	38.9 C (102.0 F)
2011	37.8 C (100.0 F)
2012	40.6 C (105.1 F)
2013	42.8 C (109.0 F)
2014	40.6 C (105.1 F)
2015	42.8 C (109.0 F)

Coldest night (TNn)

The coldest night of the year at Nampa Sugar Factory, 1976 to 2015. The record is -32.2 C (-26.0 F) in 1990, marked on the chart; the median year is -16.1 C (3.0 F).

Coldest night (TNn) at Nampa Sugar Factory by year
Year	Coldest night (TNn)
1976	-13.9 C (7.0 F)
1977	-22.8 C (-9.0 F)
1978	-22.2 C (-8.0 F)
1979	-28.9 C (-20.0 F)
1980	-20.6 C (-5.1 F)
1981	-11.1 C (12.0 F)
1982	-20.6 C (-5.1 F)
1983	-23.9 C (-11.0 F)
1984	-23.3 C (-9.9 F)
1985	-25.0 C (-13.0 F)
1986	-16.1 C (3.0 F)
1987	-14.4 C (6.1 F)
1988	-20.0 C (-4.0 F)
1989	-29.4 C (-20.9 F)
1990	-32.2 C (-26.0 F)
1991	-20.0 C (-4.0 F)
1992	-17.2 C (1.0 F)
1993	-18.3 C (-0.9 F)
1994	-15.6 C (3.9 F)
1995	-13.9 C (7.0 F)
1996	-15.6 C (3.9 F)
1997	-12.2 C (10.0 F)
1998	-20.0 C (-4.0 F)
1999	-7.8 C (18.0 F)
2000	-10.0 C (14.0 F)
2001	-14.4 C (6.1 F)
2002	-11.1 C (12.0 F)
2003	-9.4 C (15.1 F)
2004	-16.1 C (3.0 F)
2005	-15.0 C (5.0 F)
2006	-11.7 C (10.9 F)
2007	-15.0 C (5.0 F)
2008	-16.7 C (1.9 F)
2009	-20.6 C (-5.1 F)
2010	-15.0 C (5.0 F)
2011	-14.4 C (6.1 F)
2012	-11.7 C (10.9 F)
2013	-20.0 C (-4.0 F)
2014	-18.9 C (-2.0 F)
2015	-15.0 C (5.0 F)

Wettest day (Rx1day)

The wettest day of the year at Nampa Sugar Factory, 1976 to 2015. The record is 45.7 mm (1.8 in) in 2015, marked on the chart; the median year is 20.6 mm (0.8 in).

Wettest day (Rx1day) at Nampa Sugar Factory by year
Year	Wettest day (Rx1day)
1976	6.1 mm (0.24 in)
1977	18.8 mm (0.7 in)
1978	12.7 mm (0.5 in)
1979	27.4 mm (1.1 in)
1980	42.9 mm (1.7 in)
1981	23.4 mm (0.9 in)
1982	22.9 mm (0.9 in)
1983	19.8 mm (0.8 in)
1984	16.8 mm (0.7 in)
1985	14.0 mm (0.6 in)
1986	21.1 mm (0.8 in)
1987	18.0 mm (0.7 in)
1988	11.9 mm (0.5 in)
1989	20.6 mm (0.8 in)
1990	14.0 mm (0.6 in)
1991	20.8 mm (0.8 in)
1992	18.0 mm (0.7 in)
1993	19.6 mm (0.8 in)
1994	23.9 mm (0.9 in)
1995	20.3 mm (0.8 in)
1996	19.6 mm (0.8 in)
1997	24.1 mm (0.9 in)
1998	22.4 mm (0.9 in)
1999	13.2 mm (0.5 in)
2000	26.4 mm (1.0 in)
2001	12.7 mm (0.5 in)
2002	20.6 mm (0.8 in)
2003	23.6 mm (0.9 in)
2004	14.5 mm (0.6 in)
2005	17.8 mm (0.7 in)
2006	19.6 mm (0.8 in)
2007	25.4 mm (1.0 in)
2008	24.4 mm (1.0 in)
2009	19.1 mm (0.8 in)
2010	25.4 mm (1.0 in)
2011	26.4 mm (1.0 in)
2012	27.2 mm (1.1 in)
2013	22.9 mm (0.9 in)
2014	24.4 mm (1.0 in)
2015	45.7 mm (1.8 in)

Wettest five days (Rx5day)

The wettest five days of the year at Nampa Sugar Factory, 1976 to 2015. The record is 68.8 mm (2.7 in) in 1980, marked on the chart; the median year is 32.1 mm (1.3 in).

Wettest five days (Rx5day) at Nampa Sugar Factory by year
Year	Wettest five days (Rx5day)
1976	8.7 mm (0.34 in)
1977	25.9 mm (1.0 in)
1978	28.4 mm (1.1 in)
1979	38.6 mm (1.5 in)
1980	68.8 mm (2.7 in)
1981	32.8 mm (1.3 in)
1982	41.2 mm (1.6 in)
1983	31.4 mm (1.2 in)
1984	29.8 mm (1.2 in)
1985	26.5 mm (1.0 in)
1986	40.4 mm (1.6 in)
1987	23.1 mm (0.9 in)
1988	19.5 mm (0.8 in)
1989	23.7 mm (0.9 in)
1990	25.6 mm (1.0 in)
1991	35.1 mm (1.4 in)
1992	38.4 mm (1.5 in)
1993	44.9 mm (1.8 in)
1994	38.6 mm (1.5 in)
1995	40.2 mm (1.6 in)
1996	38.4 mm (1.5 in)
1997	44.7 mm (1.8 in)
1998	35.2 mm (1.4 in)
1999	20.1 mm (0.8 in)
2000	43.5 mm (1.7 in)
2001	19.7 mm (0.8 in)
2002	26.2 mm (1.0 in)
2003	26.4 mm (1.0 in)
2004	23.6 mm (0.9 in)
2005	46.2 mm (1.8 in)
2006	46.5 mm (1.8 in)
2007	27.4 mm (1.1 in)
2008	26.9 mm (1.1 in)
2009	26.0 mm (1.0 in)
2010	28.2 mm (1.1 in)
2011	42.9 mm (1.7 in)
2012	47.3 mm (1.9 in)
2013	22.9 mm (0.9 in)
2014	44.5 mm (1.8 in)
2015	49.5 mm (1.9 in)

Longest dry spell (CDD)

The longest dry spell of the year at Nampa Sugar Factory, 1976 to 2015. The record is 87 days in 1987, marked on the chart; the median year is 45 days.

Longest dry spell (CDD) at Nampa Sugar Factory by year
Year	Longest dry spell (CDD)
1976	24 days
1977	30 days
1978	72 days
1979	52 days
1980	61 days
1981	56 days
1982	20 days
1983	37 days
1984	42 days
1985	40 days
1986	46 days
1987	87 days
1988	44 days
1989	67 days
1990	42 days
1991	71 days
1992	60 days
1993	59 days
1994	85 days
1995	34 days
1996	38 days
1997	34 days
1998	39 days
1999	77 days
2000	44 days
2001	71 days
2002	53 days
2003	58 days
2004	29 days
2005	52 days
2006	78 days
2007	35 days
2008	42 days
2009	56 days
2010	39 days
2011	51 days
2012	70 days
2013	39 days
2014	39 days
2015	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

27 years with a frost

Across 27 years with a frost, the median last spring frost at Nampa Sugar Factory falls on 5 May and the median first autumn frost on 12 October, which leaves a median of 162 days between them.

Fitted over all years, the growing season changes by +4.5 days per decade at this station.

Frost dates and growing season at Nampa Sugar Factory
Measure	Median, all years	Earliest period	Recent period (1979 to 2014)	Recent against earliest	Fitted trend
Last spring frost	5 May	n/a	5 May	n/a	-0.5 days per decade
First autumn frost	12 October	n/a	12 October	n/a	+4.0 days per decade
Growing days	162 days	n/a	162 days	n/a	+4.5 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

35 years, 1977 to 2014

A day with at least 20.5 mm (0.8 in) of rain is expected about once in 2 years. A day with at least 29.1 mm (1.1 in) of rain is expected about once in 100 years.

Rainfall return levels at Nampa Sugar Factory: the daily rain expected about once in a given number of years
Expected about once in	A day with at least	Note
2 years	20.5 mm (0.8 in)
5 years	24.3 mm (1.0 in)
10 years	26.1 mm (1.0 in)
25 years	27.7 mm (1.1 in)
50 years	28.5 mm (1.1 in)	Longer than the 35 years of record
100 years	29.1 mm (1.1 in)	Longer than the 35 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, 35 years of values from 1977 to 2014.

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: 27.4 mm (1.1 in) in 1979; 27.2 mm (1.1 in) in 2012; 26.4 mm (1.0 in) in 2000.

Download the Data

Data for Nampa Sugar Factory standing records by year: CSV or JSON. Field meanings are on the data page.
Data for Nampa Sugar Factory 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).