Record envelope, standing records and threshold days for Winchester (USC00109846), Idaho, United States, with 51 years of record.
Key Facts for Winchester
Winchester (USC00109846) is a weather station in Idaho, United States at 46.24 latitude and -116.62 longitude, 1,211 m (3,972 ft) above sea level.
The station reports from 1965 to 2015, 51 years of record.
1,464 records set at Winchester still stand.
Records are tracked for tmax, tmin, prcp, snow, snwd: an element needs 30 years of data to be eligible.
Winchester set a daily record precipitation of 24.9 mm (1.0 in) on 10 November 2015.
About the Station
Location: Idaho, United States, 46.24 latitude, -116.62 longitude.
Elevation: 1,211 m (3,972 ft).
Period of record: 1965 to 2015, 51 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 Winchester. 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 Winchester, with 2026 drawn through them
Month
Highest record high
Lowest record low
2026 highest maximum
2026 lowest minimum
Jan
14.4 C (57.9 F)
-32.2 C (-26.0 F)
n/a
n/a
Feb
19.4 C (66.9 F)
-33.3 C (-27.9 F)
n/a
n/a
Mar
21.1 C (70.0 F)
-23.3 C (-9.9 F)
n/a
n/a
Apr
28.9 C (84.0 F)
-13.9 C (7.0 F)
n/a
n/a
May
30.0 C (86.0 F)
-7.2 C (19.0 F)
n/a
n/a
Jun
35.0 C (95.0 F)
-6.1 C (21.0 F)
n/a
n/a
Jul
35.6 C (96.1 F)
-2.2 C (28.0 F)
n/a
n/a
Aug
36.7 C (98.1 F)
-3.9 C (25.0 F)
n/a
n/a
Sep
35.0 C (95.0 F)
-8.3 C (17.1 F)
n/a
n/a
Oct
31.1 C (88.0 F)
-23.3 C (-9.9 F)
n/a
n/a
Nov
19.4 C (66.9 F)
-29.4 C (-20.9 F)
n/a
n/a
Dec
15.6 C (60.1 F)
-40.0 C (-40.0 F)
n/a
n/a
Which Years Hold Standing Records
1,464 standing records
Year with most
1,464 records at Winchester still stand. 1971 holds the most, with 46.
Standing records at Winchester by the year they were set
Year set
Standing records
1965
13
1966
43
1967
30
1968
32
1969
43
1970
40
1971
46
1972
36
1973
30
1974
26
1975
37
1976
27
1977
40
1978
20
1979
21
1980
35
1981
29
1982
22
1983
29
1984
29
1985
39
1986
43
1987
41
1988
37
1989
33
1990
31
1991
18
1992
35
1993
32
1994
33
1995
28
1996
36
1997
16
1998
20
1999
26
2000
20
2001
19
2002
29
2003
29
2004
15
2005
20
2006
26
2007
26
2008
34
2009
28
2010
16
2011
18
2012
23
2013
20
2014
23
2015
22
All-Time Record Progression
1 new records
1 all-time records were set at Winchester between 2 November 2015 and 2 November 2015. Each dot is a new record.
When Winchester set new all-time records
Date
Kind
Detail
2015-11-02
Record daily precipitation
Record daily precipitation 55.9 mm (2.2 in)
Wettest Day of Each Month
Nov: 55.9 mm (2.2 in)
The wettest day on record for each calendar month at Winchester. The most was 55.9 mm (2.2 in) on 2 November 2015.
Record daily precipitation for each month at Winchester
Month
Record daily precipitation (mm)
Date
Jan
27.4 mm (1.1 in)
25 January 1975
Feb
36.8 mm (1.4 in)
23 February 1986
Mar
26.9 mm (1.1 in)
18 March 1972
Apr
33.0 mm (1.3 in)
27 April 1978
May
42.7 mm (1.7 in)
24 May 1990
Jun
39.1 mm (1.5 in)
5 June 1995
Jul
30.5 mm (1.2 in)
1 July 1982
Aug
53.8 mm (2.1 in)
15 August 1993
Sep
35.1 mm (1.4 in)
30 September 2000
Oct
31.8 mm (1.3 in)
31 October 1973
Nov
55.9 mm (2.2 in)
2 November 2015
Dec
24.9 mm (1.0 in)
25 December 1967
Period of Record Coverage
1965 to 2015
Complete yearUnder 90 percent of days
51 years of record at Winchester, 1965 to 2015. 3 years have data for under 90 percent of days and are left out of rankings: 1965, 1984, 2015.
Cooler than the station meanWarmer than the station mean
One stripe for each of 45 complete years at Winchester, 1966 to 2013. Blue stripes are years cooler than the station's own mean of 6.4 C (43.5 F); red stripes are warmer. The coolest year was 1982, at 4.9 C (40.7 F), and the warmest was 1992, at 7.6 C (45.6 F). The strongest colour marks a difference of 1.6 C (2.9 F).
Annual mean temperature at Winchester as warming stripes, 1966 to 2013
Year
Annual mean temperature
Difference from the station mean
1966
6.1 C
-0.28 C
1967
6.7 C
+0.33 C
1968
5.8 C
-0.61 C
1969
5.8 C
-0.63 C
1970
5.9 C
-0.46 C
1971
5.3 C
-1.13 C
1972
5.3 C
-1.08 C
1973
6.2 C
-0.19 C
1974
6.1 C
-0.26 C
1975
5.1 C
-1.29 C
1976
6.2 C
-0.25 C
1977
5.9 C
-0.53 C
1978
5.7 C
-0.72 C
1979
6.1 C
-0.34 C
1980
6.2 C
-0.20 C
1981
6.6 C
+0.17 C
1982
4.9 C
-1.55 C
1983
6.4 C
+0.00 C
1986
7.2 C
+0.76 C
1987
7.1 C
+0.67 C
1988
6.6 C
+0.24 C
1989
6.2 C
-0.19 C
1990
6.6 C
+0.21 C
1991
6.6 C
+0.16 C
1992
7.6 C
+1.15 C
1993
5.4 C
-1.03 C
1994
6.6 C
+0.19 C
1995
6.8 C
+0.39 C
1996
6.2 C
-0.22 C
1997
6.8 C
+0.39 C
1998
7.4 C
+0.97 C
1999
6.6 C
+0.15 C
2000
6.2 C
-0.23 C
2001
6.8 C
+0.36 C
2002
6.2 C
-0.17 C
2003
7.4 C
+1.00 C
2005
6.9 C
+0.49 C
2006
7.2 C
+0.82 C
2007
7.1 C
+0.66 C
2008
6.3 C
-0.09 C
2009
6.5 C
+0.14 C
2010
7.0 C
+0.57 C
2011
6.4 C
+0.03 C
2012
7.4 C
+0.95 C
2013
7.0 C
+0.61 C
The annual mean temperature here has risen by 0.3 C (0.2 to 0.4) per decade over 1966 to 2013. In Fahrenheit: 0.5 F (0.3 to 0.7) per decade. The slope is a straight line fitted to 45 complete years; the brackets give its 95 percent interval.
Fitted temperature trends per decade at Winchester
Measure
Per decade (C)
Per decade (F)
Period
Complete years
Reading
Annual mean temperature
0.3 C (0.2 to 0.4) per decade
0.5 F (0.3 to 0.7) per decade
1966 to 2013
45
Rise
Mean daily maximum
0.04 C (-0.10 to 0.18) per decade
0.1 F (-0.2 to 0.3) per decade
1966 to 2013
45
Not clearly different from zero
Mean daily minimum
0.5 C (0.4 to 0.6) per decade
0.9 F (0.7 to 1.1) per decade
1966 to 2013
45
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
1965 to 2015
Yearly extremes at Winchester: the record and the median year
Measure
Record
Year of the record
Median year
Years with a value
Hottest day (TXx)
36.7 C (98.1 F)
1969
33.9 C (93.0 F)
51
Coldest night (TNn)
-40.0 C (-40.0 F)
1968
-23.3 C (-9.9 F)
51
Wettest day (Rx1day)
55.9 mm (2.2 in)
2015
28.2 mm (1.1 in)
51
Wettest five days (Rx5day)
73.9 mm (2.9 in)
1998
49.5 mm (1.9 in)
51
Longest dry spell (CDD)
84 days
2012
29 days
51
Hottest day (TXx)
The hottest day of the year at Winchester, 1965 to 2015. The record is 36.7 C (98.1 F) in 1969, marked on the chart; the median year is 33.9 C (93.0 F).
Hottest day (TXx) at Winchester by year
Year
Hottest day (TXx)
1965
34.4 C (93.9 F)
1966
35.6 C (96.1 F)
1967
35.6 C (96.1 F)
1968
33.3 C (91.9 F)
1969
36.7 C (98.1 F)
1970
32.8 C (91.0 F)
1971
35.0 C (95.0 F)
1972
35.6 C (96.1 F)
1973
33.3 C (91.9 F)
1974
33.3 C (91.9 F)
1975
33.3 C (91.9 F)
1976
31.1 C (88.0 F)
1977
35.0 C (95.0 F)
1978
33.3 C (91.9 F)
1979
34.4 C (93.9 F)
1980
33.9 C (93.0 F)
1981
33.3 C (91.9 F)
1982
32.2 C (90.0 F)
1983
33.9 C (93.0 F)
1984
34.4 C (93.9 F)
1985
34.4 C (93.9 F)
1986
35.6 C (96.1 F)
1987
32.2 C (90.0 F)
1988
35.0 C (95.0 F)
1989
31.7 C (89.1 F)
1990
35.0 C (95.0 F)
1991
31.1 C (88.0 F)
1992
33.3 C (91.9 F)
1993
28.9 C (84.0 F)
1994
34.4 C (93.9 F)
1995
29.4 C (84.9 F)
1996
34.4 C (93.9 F)
1997
32.2 C (90.0 F)
1998
35.6 C (96.1 F)
1999
32.2 C (90.0 F)
2000
32.8 C (91.0 F)
2001
35.0 C (95.0 F)
2002
33.9 C (93.0 F)
2003
33.9 C (93.0 F)
2004
32.8 C (91.0 F)
2005
34.4 C (93.9 F)
2006
35.6 C (96.1 F)
2007
35.0 C (95.0 F)
2008
36.1 C (97.0 F)
2009
34.4 C (93.9 F)
2010
32.2 C (90.0 F)
2011
33.3 C (91.9 F)
2012
34.4 C (93.9 F)
2013
33.3 C (91.9 F)
2014
33.9 C (93.0 F)
2015
35.0 C (95.0 F)
Coldest night (TNn)
The coldest night of the year at Winchester, 1965 to 2015. The record is -40.0 C (-40.0 F) in 1968, marked on the chart; the median year is -23.3 C (-9.9 F).
Coldest night (TNn) at Winchester by year
Year
Coldest night (TNn)
1965
-16.7 C (1.9 F)
1966
-22.2 C (-8.0 F)
1967
-21.7 C (-7.1 F)
1968
-40.0 C (-40.0 F)
1969
-23.3 C (-9.9 F)
1970
-24.4 C (-11.9 F)
1971
-23.3 C (-9.9 F)
1972
-30.6 C (-23.1 F)
1973
-28.9 C (-20.0 F)
1974
-28.3 C (-18.9 F)
1975
-23.3 C (-9.9 F)
1976
-23.3 C (-9.9 F)
1977
-22.8 C (-9.0 F)
1978
-33.3 C (-27.9 F)
1979
-32.2 C (-26.0 F)
1980
-26.7 C (-16.1 F)
1981
-26.1 C (-15.0 F)
1982
-31.1 C (-24.0 F)
1983
-36.1 C (-33.0 F)
1984
-25.6 C (-14.1 F)
1985
-32.2 C (-26.0 F)
1986
-24.4 C (-11.9 F)
1987
-30.0 C (-22.0 F)
1988
-24.4 C (-11.9 F)
1989
-33.3 C (-27.9 F)
1990
-30.0 C (-22.0 F)
1991
-18.3 C (-0.9 F)
1992
-17.8 C (0.0 F)
1993
-22.2 C (-8.0 F)
1994
-16.7 C (1.9 F)
1995
-15.6 C (3.9 F)
1996
-27.2 C (-17.0 F)
1997
-19.4 C (-2.9 F)
1998
-23.9 C (-11.0 F)
1999
-14.4 C (6.1 F)
2000
-17.2 C (1.0 F)
2001
-17.8 C (0.0 F)
2002
-20.0 C (-4.0 F)
2003
-20.0 C (-4.0 F)
2004
-28.9 C (-20.0 F)
2005
-21.7 C (-7.1 F)
2006
-21.1 C (-6.0 F)
2007
-26.7 C (-16.1 F)
2008
-23.3 C (-9.9 F)
2009
-23.3 C (-9.9 F)
2010
-26.1 C (-15.0 F)
2011
-19.4 C (-2.9 F)
2012
-15.0 C (5.0 F)
2013
-25.0 C (-13.0 F)
2014
-27.2 C (-17.0 F)
2015
-15.0 C (5.0 F)
Wettest day (Rx1day)
The wettest day of the year at Winchester, 1965 to 2015. The record is 55.9 mm (2.2 in) in 2015, marked on the chart; the median year is 28.2 mm (1.1 in).
Wettest day (Rx1day) at Winchester by year
Year
Wettest day (Rx1day)
1965
28.4 mm (1.1 in)
1966
30.5 mm (1.2 in)
1967
24.9 mm (1.0 in)
1968
26.9 mm (1.1 in)
1969
22.4 mm (0.9 in)
1970
26.7 mm (1.1 in)
1971
21.6 mm (0.9 in)
1972
26.9 mm (1.1 in)
1973
31.8 mm (1.3 in)
1974
21.8 mm (0.9 in)
1975
39.4 mm (1.6 in)
1976
19.1 mm (0.8 in)
1977
34.3 mm (1.4 in)
1978
33.0 mm (1.3 in)
1979
32.5 mm (1.3 in)
1980
29.2 mm (1.1 in)
1981
24.4 mm (1.0 in)
1982
30.5 mm (1.2 in)
1983
23.6 mm (0.9 in)
1984
23.1 mm (0.9 in)
1985
21.1 mm (0.8 in)
1986
36.8 mm (1.4 in)
1987
22.1 mm (0.9 in)
1988
31.0 mm (1.2 in)
1989
34.3 mm (1.4 in)
1990
42.7 mm (1.7 in)
1991
29.0 mm (1.1 in)
1992
24.4 mm (1.0 in)
1993
53.8 mm (2.1 in)
1994
25.4 mm (1.0 in)
1995
39.1 mm (1.5 in)
1996
29.0 mm (1.1 in)
1997
24.4 mm (1.0 in)
1998
28.2 mm (1.1 in)
1999
35.6 mm (1.4 in)
2000
35.1 mm (1.4 in)
2001
25.4 mm (1.0 in)
2002
25.9 mm (1.0 in)
2003
26.4 mm (1.0 in)
2004
29.7 mm (1.2 in)
2005
24.4 mm (1.0 in)
2006
21.6 mm (0.9 in)
2007
24.1 mm (0.9 in)
2008
22.9 mm (0.9 in)
2009
31.0 mm (1.2 in)
2010
23.6 mm (0.9 in)
2011
25.4 mm (1.0 in)
2012
32.3 mm (1.3 in)
2013
30.5 mm (1.2 in)
2014
39.6 mm (1.6 in)
2015
55.9 mm (2.2 in)
Wettest five days (Rx5day)
The wettest five days of the year at Winchester, 1965 to 2015. The record is 73.9 mm (2.9 in) in 1998, marked on the chart; the median year is 49.5 mm (1.9 in).
Wettest five days (Rx5day) at Winchester by year
Year
Wettest five days (Rx5day)
1965
36.0 mm (1.4 in)
1966
58.1 mm (2.3 in)
1967
53.8 mm (2.1 in)
1968
69.3 mm (2.7 in)
1969
53.1 mm (2.1 in)
1970
50.5 mm (2.0 in)
1971
49.5 mm (1.9 in)
1972
40.4 mm (1.6 in)
1973
50.6 mm (2.0 in)
1974
49.5 mm (1.9 in)
1975
53.6 mm (2.1 in)
1976
49.8 mm (2.0 in)
1977
47.5 mm (1.9 in)
1978
43.2 mm (1.7 in)
1979
70.4 mm (2.8 in)
1980
62.0 mm (2.4 in)
1981
53.4 mm (2.1 in)
1982
46.0 mm (1.8 in)
1983
41.9 mm (1.6 in)
1984
41.9 mm (1.6 in)
1985
39.8 mm (1.6 in)
1986
59.2 mm (2.3 in)
1987
51.6 mm (2.0 in)
1988
60.0 mm (2.4 in)
1989
50.8 mm (2.0 in)
1990
59.8 mm (2.4 in)
1991
51.8 mm (2.0 in)
1992
45.1 mm (1.8 in)
1993
61.2 mm (2.4 in)
1994
34.6 mm (1.4 in)
1995
45.5 mm (1.8 in)
1996
57.9 mm (2.3 in)
1997
46.7 mm (1.8 in)
1998
73.9 mm (2.9 in)
1999
45.0 mm (1.8 in)
2000
47.5 mm (1.9 in)
2001
38.9 mm (1.5 in)
2002
36.9 mm (1.5 in)
2003
65.0 mm (2.6 in)
2004
49.8 mm (2.0 in)
2005
36.8 mm (1.4 in)
2006
38.3 mm (1.5 in)
2007
37.9 mm (1.5 in)
2008
47.2 mm (1.9 in)
2009
49.0 mm (1.9 in)
2010
56.9 mm (2.2 in)
2011
48.0 mm (1.9 in)
2012
40.5 mm (1.6 in)
2013
48.0 mm (1.9 in)
2014
59.5 mm (2.3 in)
2015
55.9 mm (2.2 in)
Longest dry spell (CDD)
The longest dry spell of the year at Winchester, 1965 to 2015. The record is 84 days in 2012, marked on the chart; the median year is 29 days.
Longest dry spell (CDD) at Winchester by year
Year
Longest dry spell (CDD)
1965
17 days
1966
33 days
1967
50 days
1968
15 days
1969
43 days
1970
33 days
1971
41 days
1972
24 days
1973
32 days
1974
60 days
1975
17 days
1976
24 days
1977
34 days
1978
39 days
1979
30 days
1980
34 days
1981
23 days
1982
10 days
1983
20 days
1984
24 days
1985
30 days
1986
24 days
1987
35 days
1988
27 days
1989
22 days
1990
21 days
1991
43 days
1992
25 days
1993
21 days
1994
21 days
1995
20 days
1996
31 days
1997
21 days
1998
22 days
1999
26 days
2000
65 days
2001
32 days
2002
23 days
2003
25 days
2004
20 days
2005
38 days
2006
41 days
2007
49 days
2008
29 days
2009
26 days
2010
24 days
2011
33 days
2012
84 days
2013
35 days
2014
32 days
2015
35 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
45 years with a frost
Across 45 years with a frost, the median last spring frost at Winchester falls on 5 June and the median first autumn frost on 9 September, which leaves a median of 94 days between them.
Fitted over all years, the growing season changes by +19.9 days per decade at this station.
Frost dates and growing season at Winchester
Measure
Median, all years
Earliest period
Recent period (1981 to 2013)
Recent against earliest
Fitted trend
Last spring frost
5 June
n/a
29 May
n/a
-4.8 days per decade
First autumn frost
9 September
n/a
18 September
n/a
+15.1 days per decade
Growing days
94 days
n/a
108 days
n/a
+19.9 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
49 years, 1966 to 2014
A day with at least 27.5 mm (1.1 in) of rain is expected about once in 2 years. A day with at least 52.3 mm (2.1 in) of rain is expected about once in 100 years.
Rainfall return levels at Winchester: the daily rain expected about once in a given number of years
Expected about once in
A day with at least
Note
2 years
27.5 mm (1.1 in)
5 years
33.4 mm (1.3 in)
10 years
37.5 mm (1.5 in)
25 years
43.2 mm (1.7 in)
50 years
47.6 mm (1.9 in)
Longer than the 49 years of record
100 years
52.3 mm (2.1 in)
Longer than the 49 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, 49 years of values from 1966 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: 53.8 mm (2.1 in) in 1993; 42.7 mm (1.7 in) in 1990; 39.6 mm (1.6 in) in 2014.
Station Changes
No change in the annual mean temperature of this station was found against its neighbours.
Download the Data
Data for Winchester standing records by year: CSV or JSON. Field meanings are on the data page.
Data for Winchester 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.