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
Record highRecord low2026 daily maximum2026 daily minimum
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
Year with most
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.
When Nampa Sugar Factory set new all-time records
Date
Kind
Detail
2015-06-05
Record daily precipitation
Record daily precipitation 45.7 mm (1.8 in)
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
Complete yearUnder 90 percent of days
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.
Cooler than the station meanWarmer than the station mean
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 2026-10-15 (15 October 2026). Records are computed by this site and are not official.