Record envelope, standing records and threshold days for Nezperce (USC00106424), Idaho, United States, with 120 years of record.
Key Facts for Nezperce
Nezperce (USC00106424) is a weather station in Idaho, United States at 46.23 latitude and -116.24 longitude, 990 m (3,248 ft) above sea level.
The station reports from 1901 to 2020, 120 years of record.
1,464 records set at Nezperce still stand.
Records are tracked for tmax, tmin, prcp, snow, snwd: an element needs 30 years of data to be eligible.
Nezperce tied a daily record low minimum temperature of -8.3 C (17.1 F) on 13 April 2020.
About the Station
Location: Idaho, United States, 46.23 latitude, -116.24 longitude.
Elevation: 990 m (3,248 ft).
Period of record: 1901 to 2020, 120 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 Nezperce. 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 Nezperce, 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)
-28.9 C (-20.0 F)
n/a
n/a
Feb
19.4 C (66.9 F)
-28.3 C (-18.9 F)
n/a
n/a
Mar
24.4 C (75.9 F)
-23.3 C (-9.9 F)
n/a
n/a
Apr
30.6 C (87.1 F)
-9.4 C (15.1 F)
n/a
n/a
May
32.2 C (90.0 F)
-7.8 C (18.0 F)
n/a
n/a
Jun
37.8 C (100.0 F)
-1.7 C (28.9 F)
n/a
n/a
Jul
39.4 C (102.9 F)
-0.6 C (30.9 F)
n/a
n/a
Aug
41.1 C (106.0 F)
-3.9 C (25.0 F)
n/a
n/a
Sep
36.1 C (97.0 F)
-7.8 C (18.0 F)
n/a
n/a
Oct
30.0 C (86.0 F)
-17.8 C (0.0 F)
n/a
n/a
Nov
22.8 C (73.0 F)
-25.0 C (-13.0 F)
n/a
n/a
Dec
15.0 C (59.0 F)
-36.1 C (-33.0 F)
n/a
n/a
Which Years Hold Standing Records
1,464 standing records
Year with most
1,464 records at Nezperce still stand. 1955 holds the most, with 45.
Standing records at Nezperce by the year they were set
Year set
Standing records
1951
5
1952
10
1953
23
1954
15
1955
45
1956
16
1957
19
1958
26
1959
18
1960
34
1961
29
1962
30
1963
34
1964
23
1965
31
1966
29
1967
21
1968
29
1969
23
1970
31
1971
21
1972
38
1973
15
1974
17
1975
28
1976
17
1977
22
1978
15
1979
15
1980
20
1981
23
1982
13
1983
24
1984
19
1985
28
1986
29
1987
28
1988
30
1989
19
1990
21
1991
8
1992
18
1993
25
1994
13
1995
25
1996
22
1998
11
1999
31
2000
11
2001
15
2002
30
2003
30
2004
12
2005
20
2006
31
2007
13
2008
23
2009
12
2010
9
2012
15
2013
18
2014
20
2015
32
2016
23
2017
18
2018
14
2019
27
2020
5
All-Time Record Progression
3 new records
3 all-time records were set at Nezperce between 3 December 2005 and 29 June 2015. Each dot is a new record.
When Nezperce set new all-time records
Date
Kind
Detail
2005-12-03
Record daily snowfall
Record daily snowfall 43.2 cm (17.0 in)
2008-08-17
Record high maximum temperature
Record high maximum temperature 41.1 C (106.0 F)
2015-06-29
Record high minimum temperature
Record high minimum temperature 20.6 C (69.1 F)
Wettest Day of Each Month
Jul: 58.9 mm (2.3 in)
The wettest day on record for each calendar month at Nezperce. The most was 58.9 mm (2.3 in) on 13 July 1956.
Record daily precipitation for each month at Nezperce
Month
Record daily precipitation (mm)
Date
Jan
30.5 mm (1.2 in)
4 January 2015
Feb
31.5 mm (1.2 in)
7 February 2020
Mar
25.7 mm (1.0 in)
4 March 1999
Apr
36.6 mm (1.4 in)
27 April 1978
May
49.0 mm (1.9 in)
29 May 1990
Jun
52.3 mm (2.1 in)
11 June 1958
Jul
58.9 mm (2.3 in)
13 July 1956
Aug
36.8 mm (1.4 in)
1 August 1960
Sep
31.5 mm (1.2 in)
9 September 1998
Oct
31.5 mm (1.2 in)
31 October 1973
Nov
29.2 mm (1.1 in)
25 November 1961
Dec
25.4 mm (1.0 in)
8 December 2007
Period of Record Coverage
1901 to 2020
Complete yearUnder 90 percent of days
69 years of record at Nezperce, 1901 to 2020. 7 years have data for under 90 percent of days and are left out of rankings: 1901, 1951, 1996, 2007, 2010, 2012, 2020.
Cooler than the station meanWarmer than the station mean
One stripe for each of 59 complete years at Nezperce, 1952 to 2019. Blue stripes are years cooler than the station's own mean of 7.5 C (45.6 F); red stripes are warmer. The coolest year was 1955, at 6.0 C (42.8 F), and the warmest was 1992, at 8.7 C (47.7 F). The strongest colour marks a difference of 1.6 C (2.9 F).
Annual mean temperature at Nezperce as warming stripes, 1952 to 2019
Year
Annual mean temperature
Difference from the station mean
1952
8.0 C
+0.43 C
1953
8.6 C
+1.09 C
1954
7.6 C
+0.06 C
1955
6.0 C
-1.57 C
1956
7.3 C
-0.24 C
1957
7.4 C
-0.20 C
1959
7.3 C
-0.30 C
1960
7.2 C
-0.33 C
1961
8.0 C
+0.44 C
1962
7.3 C
-0.22 C
1963
7.9 C
+0.34 C
1964
6.6 C
-0.92 C
1965
7.7 C
+0.17 C
1966
8.0 C
+0.48 C
1967
8.6 C
+1.04 C
1968
7.5 C
-0.01 C
1969
7.4 C
-0.20 C
1970
7.6 C
+0.03 C
1971
7.1 C
-0.42 C
1972
7.1 C
-0.45 C
1973
7.6 C
+0.01 C
1974
7.9 C
+0.30 C
1975
6.8 C
-0.80 C
1976
7.6 C
+0.04 C
1977
7.6 C
+0.00 C
1978
7.2 C
-0.33 C
1979
7.6 C
+0.01 C
1980
7.8 C
+0.25 C
1981
8.2 C
+0.64 C
1982
7.0 C
-0.54 C
1983
7.9 C
+0.37 C
1984
7.2 C
-0.36 C
1985
6.1 C
-1.45 C
1986
8.3 C
+0.70 C
1987
8.5 C
+0.96 C
1988
8.1 C
+0.55 C
1989
7.3 C
-0.28 C
1990
7.9 C
+0.36 C
1991
7.8 C
+0.23 C
1992
8.7 C
+1.19 C
1993
6.8 C
-0.80 C
1994
8.1 C
+0.59 C
1995
7.7 C
+0.13 C
1998
8.3 C
+0.78 C
1999
7.6 C
+0.04 C
2000
7.0 C
-0.51 C
2001
7.4 C
-0.15 C
2002
7.0 C
-0.60 C
2004
7.8 C
+0.29 C
2005
7.3 C
-0.24 C
2006
7.7 C
+0.18 C
2008
7.0 C
-0.58 C
2013
7.3 C
-0.30 C
2014
7.8 C
+0.23 C
2015
8.7 C
+1.18 C
2016
7.8 C
+0.20 C
2017
7.1 C
-0.42 C
2018
7.4 C
-0.12 C
2019
6.5 C
-1.06 C
The fitted trend in annual mean temperature here over 1952 to 2019 is 0.00 C (-0.08 to 0.08) per decade. The interval includes zero, so the trend is not clearly different from zero. In Fahrenheit: 0.00 F (-0.14 to 0.15) per decade. The slope is a straight line fitted to 59 complete years; the brackets give its 95 percent interval.
Fitted temperature trends per decade at Nezperce
Measure
Per decade (C)
Per decade (F)
Period
Complete years
Reading
Annual mean temperature
0.00 C (-0.08 to 0.08) per decade
0.00 F (-0.14 to 0.15) per decade
1952 to 2019
59
Not clearly different from zero
Mean daily maximum
0.04 C (-0.06 to 0.14) per decade
0.1 F (-0.1 to 0.3) per decade
1952 to 2019
59
Not clearly different from zero
Mean daily minimum
-0.04 C (-0.12 to 0.04) per decade
-0.1 F (-0.2 to 0.1) per decade
1952 to 2019
59
Not clearly different from zero
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
1901 to 2020
Yearly extremes at Nezperce: the record and the median year
Measure
Record
Year of the record
Median year
Years with a value
Hottest day (TXx)
41.1 C (106.0 F)
2008
35.6 C (96.1 F)
69
Coldest night (TNn)
-36.1 C (-33.0 F)
1968
-22.2 C (-8.0 F)
69
Wettest day (Rx1day)
58.9 mm (2.3 in)
1956
25.4 mm (1.0 in)
69
Wettest five days (Rx5day)
92.2 mm (3.6 in)
1958
46.8 mm (1.8 in)
68
Longest dry spell (CDD)
93 days
2017
28 days
69
Hottest day (TXx)
The hottest day of the year at Nezperce, 1901 to 2020. The record is 41.1 C (106.0 F) in 2008, marked on the chart; the median year is 35.6 C (96.1 F).
Hottest day (TXx) at Nezperce by year
Year
Hottest day (TXx)
1901
0.6 C (33.1 F)
1951
31.1 C (88.0 F)
1952
33.3 C (91.9 F)
1953
36.1 C (97.0 F)
1954
32.2 C (90.0 F)
1955
38.3 C (100.9 F)
1956
35.6 C (96.1 F)
1957
31.7 C (89.1 F)
1958
35.6 C (96.1 F)
1959
38.3 C (100.9 F)
1960
37.8 C (100.0 F)
1961
40.0 C (104.0 F)
1962
35.0 C (95.0 F)
1963
35.0 C (95.0 F)
1964
34.4 C (93.9 F)
1965
36.1 C (97.0 F)
1966
37.2 C (99.0 F)
1967
39.4 C (102.9 F)
1968
35.6 C (96.1 F)
1969
37.8 C (100.0 F)
1970
36.7 C (98.1 F)
1971
35.0 C (95.0 F)
1972
35.6 C (96.1 F)
1973
35.0 C (95.0 F)
1974
33.9 C (93.0 F)
1975
35.6 C (96.1 F)
1976
33.9 C (93.0 F)
1977
35.6 C (96.1 F)
1978
33.9 C (93.0 F)
1979
35.0 C (95.0 F)
1980
35.6 C (96.1 F)
1981
35.0 C (95.0 F)
1982
33.9 C (93.0 F)
1983
37.2 C (99.0 F)
1984
36.7 C (98.1 F)
1985
36.7 C (98.1 F)
1986
36.7 C (98.1 F)
1987
33.9 C (93.0 F)
1988
36.1 C (97.0 F)
1989
33.9 C (93.0 F)
1990
36.1 C (97.0 F)
1991
32.8 C (91.0 F)
1992
36.1 C (97.0 F)
1993
32.8 C (91.0 F)
1994
36.1 C (97.0 F)
1995
31.7 C (89.1 F)
1996
35.6 C (96.1 F)
1998
38.9 C (102.0 F)
1999
35.6 C (96.1 F)
2000
35.6 C (96.1 F)
2001
35.6 C (96.1 F)
2002
36.7 C (98.1 F)
2003
36.7 C (98.1 F)
2004
35.6 C (96.1 F)
2005
36.1 C (97.0 F)
2006
36.7 C (98.1 F)
2007
36.1 C (97.0 F)
2008
41.1 C (106.0 F)
2009
36.1 C (97.0 F)
2010
36.1 C (97.0 F)
2012
33.9 C (93.0 F)
2013
33.3 C (91.9 F)
2014
35.0 C (95.0 F)
2015
37.8 C (100.0 F)
2016
34.4 C (93.9 F)
2017
35.6 C (96.1 F)
2018
38.3 C (100.9 F)
2019
33.9 C (93.0 F)
2020
18.3 C (64.9 F)
Coldest night (TNn)
The coldest night of the year at Nezperce, 1901 to 2020. The record is -36.1 C (-33.0 F) in 1968, marked on the chart; the median year is -22.2 C (-8.0 F).
Coldest night (TNn) at Nezperce by year
Year
Coldest night (TNn)
1901
-9.4 C (15.1 F)
1951
-16.7 C (1.9 F)
1952
-20.6 C (-5.1 F)
1953
-14.4 C (6.1 F)
1954
-22.8 C (-9.0 F)
1955
-25.0 C (-13.0 F)
1956
-27.2 C (-17.0 F)
1957
-26.7 C (-16.1 F)
1958
-14.4 C (6.1 F)
1959
-23.3 C (-9.9 F)
1960
-22.8 C (-9.0 F)
1961
-23.9 C (-11.0 F)
1962
-27.2 C (-17.0 F)
1963
-28.9 C (-20.0 F)
1964
-31.7 C (-25.1 F)
1965
-15.6 C (3.9 F)
1966
-16.7 C (1.9 F)
1967
-20.6 C (-5.1 F)
1968
-36.1 C (-33.0 F)
1969
-23.3 C (-9.9 F)
1970
-20.0 C (-4.0 F)
1971
-18.3 C (-0.9 F)
1972
-28.9 C (-20.0 F)
1973
-26.7 C (-16.1 F)
1974
-25.6 C (-14.1 F)
1975
-20.0 C (-4.0 F)
1976
-19.4 C (-2.9 F)
1977
-20.6 C (-5.1 F)
1978
-27.8 C (-18.0 F)
1979
-28.3 C (-18.9 F)
1980
-21.7 C (-7.1 F)
1981
-25.0 C (-13.0 F)
1982
-26.1 C (-15.0 F)
1983
-32.8 C (-27.0 F)
1984
-21.1 C (-6.0 F)
1985
-25.0 C (-13.0 F)
1986
-21.1 C (-6.0 F)
1987
-22.2 C (-8.0 F)
1988
-20.0 C (-4.0 F)
1989
-28.3 C (-18.9 F)
1990
-29.4 C (-20.9 F)
1991
-19.4 C (-2.9 F)
1992
-16.1 C (3.0 F)
1993
-20.6 C (-5.1 F)
1994
-15.6 C (3.9 F)
1995
-15.0 C (5.0 F)
1996
-27.2 C (-17.0 F)
1998
-22.2 C (-8.0 F)
1999
-12.2 C (10.0 F)
2000
-15.0 C (5.0 F)
2001
-15.0 C (5.0 F)
2002
-20.0 C (-4.0 F)
2003
-17.2 C (1.0 F)
2004
-26.7 C (-16.1 F)
2005
-21.1 C (-6.0 F)
2006
-22.8 C (-9.0 F)
2007
-24.4 C (-11.9 F)
2008
-23.3 C (-9.9 F)
2009
-22.8 C (-9.0 F)
2010
-13.3 C (8.1 F)
2012
-11.7 C (10.9 F)
2013
-23.3 C (-9.9 F)
2014
-26.1 C (-15.0 F)
2015
-20.0 C (-4.0 F)
2016
-23.9 C (-11.0 F)
2017
-23.3 C (-9.9 F)
2018
-18.9 C (-2.0 F)
2019
-23.9 C (-11.0 F)
2020
-15.0 C (5.0 F)
Wettest day (Rx1day)
The wettest day of the year at Nezperce, 1901 to 2020. The record is 58.9 mm (2.3 in) in 1956, marked on the chart; the median year is 25.4 mm (1.0 in).
Wettest day (Rx1day) at Nezperce by year
Year
Wettest day (Rx1day)
1901
0.0 mm (0.00 in)
1951
16.8 mm (0.7 in)
1952
29.2 mm (1.1 in)
1953
32.3 mm (1.3 in)
1954
41.4 mm (1.6 in)
1955
36.1 mm (1.4 in)
1956
58.9 mm (2.3 in)
1957
33.0 mm (1.3 in)
1958
52.3 mm (2.1 in)
1959
25.9 mm (1.0 in)
1960
36.8 mm (1.4 in)
1961
29.2 mm (1.1 in)
1962
29.7 mm (1.2 in)
1963
31.8 mm (1.3 in)
1964
23.6 mm (0.9 in)
1965
32.5 mm (1.3 in)
1966
24.9 mm (1.0 in)
1967
24.6 mm (1.0 in)
1968
25.4 mm (1.0 in)
1969
20.1 mm (0.8 in)
1970
25.4 mm (1.0 in)
1971
20.3 mm (0.8 in)
1972
23.4 mm (0.9 in)
1973
31.5 mm (1.2 in)
1974
17.8 mm (0.7 in)
1975
31.0 mm (1.2 in)
1976
23.6 mm (0.9 in)
1977
32.0 mm (1.3 in)
1978
36.6 mm (1.4 in)
1979
25.1 mm (1.0 in)
1980
25.4 mm (1.0 in)
1981
27.2 mm (1.1 in)
1982
28.4 mm (1.1 in)
1983
29.2 mm (1.1 in)
1984
22.9 mm (0.9 in)
1985
26.4 mm (1.0 in)
1986
22.1 mm (0.9 in)
1987
16.5 mm (0.6 in)
1988
28.4 mm (1.1 in)
1989
25.7 mm (1.0 in)
1990
49.0 mm (1.9 in)
1991
33.8 mm (1.3 in)
1992
25.4 mm (1.0 in)
1993
18.8 mm (0.7 in)
1994
20.3 mm (0.8 in)
1995
22.9 mm (0.9 in)
1996
15.5 mm (0.6 in)
1998
31.5 mm (1.2 in)
1999
25.7 mm (1.0 in)
2000
30.0 mm (1.2 in)
2001
24.4 mm (1.0 in)
2002
25.4 mm (1.0 in)
2003
22.1 mm (0.9 in)
2004
32.5 mm (1.3 in)
2005
19.3 mm (0.8 in)
2006
24.4 mm (1.0 in)
2007
25.4 mm (1.0 in)
2008
33.3 mm (1.3 in)
2009
25.7 mm (1.0 in)
2010
25.1 mm (1.0 in)
2012
23.4 mm (0.9 in)
2013
23.9 mm (0.9 in)
2014
19.3 mm (0.8 in)
2015
30.5 mm (1.2 in)
2016
15.2 mm (0.6 in)
2017
21.8 mm (0.9 in)
2018
29.7 mm (1.2 in)
2019
24.4 mm (1.0 in)
2020
31.5 mm (1.2 in)
Wettest five days (Rx5day)
The wettest five days of the year at Nezperce, 1901 to 2020. The record is 92.2 mm (3.6 in) in 1958, marked on the chart; the median year is 46.8 mm (1.8 in).
Wettest five days (Rx5day) at Nezperce by year
Year
Wettest five days (Rx5day)
1901
n/a
1951
35.2 mm (1.4 in)
1952
54.8 mm (2.2 in)
1953
52.1 mm (2.1 in)
1954
61.8 mm (2.4 in)
1955
47.5 mm (1.9 in)
1956
63.5 mm (2.5 in)
1957
62.2 mm (2.4 in)
1958
92.2 mm (3.6 in)
1959
49.8 mm (2.0 in)
1960
39.9 mm (1.6 in)
1961
69.3 mm (2.7 in)
1962
64.0 mm (2.5 in)
1963
50.1 mm (2.0 in)
1964
59.7 mm (2.4 in)
1965
40.1 mm (1.6 in)
1966
56.6 mm (2.2 in)
1967
37.9 mm (1.5 in)
1968
40.9 mm (1.6 in)
1969
41.7 mm (1.6 in)
1970
61.3 mm (2.4 in)
1971
48.4 mm (1.9 in)
1972
50.1 mm (2.0 in)
1973
41.2 mm (1.6 in)
1974
25.9 mm (1.0 in)
1975
53.9 mm (2.1 in)
1976
32.6 mm (1.3 in)
1977
47.0 mm (1.9 in)
1978
43.5 mm (1.7 in)
1979
80.5 mm (3.2 in)
1980
37.9 mm (1.5 in)
1981
45.0 mm (1.8 in)
1982
51.8 mm (2.0 in)
1983
46.0 mm (1.8 in)
1984
40.4 mm (1.6 in)
1985
56.6 mm (2.2 in)
1986
38.6 mm (1.5 in)
1987
29.8 mm (1.2 in)
1988
47.8 mm (1.9 in)
1989
48.8 mm (1.9 in)
1990
67.6 mm (2.7 in)
1991
43.3 mm (1.7 in)
1992
44.4 mm (1.7 in)
1993
32.5 mm (1.3 in)
1994
33.3 mm (1.3 in)
1995
39.9 mm (1.6 in)
1996
47.5 mm (1.9 in)
1998
67.0 mm (2.6 in)
1999
42.5 mm (1.7 in)
2000
44.2 mm (1.7 in)
2001
39.8 mm (1.6 in)
2002
37.8 mm (1.5 in)
2003
46.5 mm (1.8 in)
2004
59.4 mm (2.3 in)
2005
53.3 mm (2.1 in)
2006
43.4 mm (1.7 in)
2007
35.6 mm (1.4 in)
2008
68.6 mm (2.7 in)
2009
41.2 mm (1.6 in)
2010
60.0 mm (2.4 in)
2012
37.6 mm (1.5 in)
2013
37.2 mm (1.5 in)
2014
34.3 mm (1.4 in)
2015
48.2 mm (1.9 in)
2016
35.8 mm (1.4 in)
2017
38.6 mm (1.5 in)
2018
54.7 mm (2.2 in)
2019
52.1 mm (2.1 in)
2020
52.3 mm (2.1 in)
Longest dry spell (CDD)
The longest dry spell of the year at Nezperce, 1901 to 2020. The record is 93 days in 2017, marked on the chart; the median year is 28 days.
Longest dry spell (CDD) at Nezperce by year
Year
Longest dry spell (CDD)
1901
1 day
1951
22 days
1952
38 days
1953
29 days
1954
24 days
1955
44 days
1956
32 days
1957
21 days
1958
31 days
1959
43 days
1960
29 days
1961
31 days
1962
21 days
1963
22 days
1964
17 days
1965
18 days
1966
34 days
1967
54 days
1968
19 days
1969
43 days
1970
32 days
1971
32 days
1972
14 days
1973
31 days
1974
35 days
1975
16 days
1976
22 days
1977
34 days
1978
30 days
1979
26 days
1980
22 days
1981
25 days
1982
17 days
1983
20 days
1984
29 days
1985
54 days
1986
25 days
1987
46 days
1988
26 days
1989
19 days
1990
24 days
1991
42 days
1992
28 days
1993
21 days
1994
36 days
1995
33 days
1996
21 days
1998
19 days
1999
26 days
2000
48 days
2001
54 days
2002
26 days
2003
25 days
2004
22 days
2005
38 days
2006
28 days
2007
27 days
2008
39 days
2009
28 days
2010
27 days
2012
53 days
2013
35 days
2014
35 days
2015
34 days
2016
23 days
2017
93 days
2018
68 days
2019
33 days
2020
19 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
59 years with a frost
Across 59 years with a frost, the median last spring frost at Nezperce falls on 26 May and the median first autumn frost on 17 September, which leaves a median of 117 days between them.
Fitted over all years, the growing season changes by -1.5 days per decade at this station.
Frost dates and growing season at Nezperce
Measure
Median, all years
Earliest period
Recent period (1982 to 2019)
Recent against earliest
Fitted trend
Last spring frost
26 May
n/a
29 May
n/a
+1.3 days per decade
First autumn frost
17 September
n/a
17 September
n/a
-0.2 days per decade
Growing days
117 days
n/a
111 days
n/a
-1.5 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
62 years, 1952 to 2019
A day with at least 26.5 mm (1.0 in) of rain is expected about once in 2 years. A day with at least 54.2 mm (2.1 in) of rain is expected about once in 100 years.
Rainfall return levels at Nezperce: the daily rain expected about once in a given number of years
Expected about once in
A day with at least
Note
2 years
26.5 mm (1.0 in)
5 years
33.0 mm (1.3 in)
10 years
37.7 mm (1.5 in)
25 years
44.0 mm (1.7 in)
50 years
49.0 mm (1.9 in)
100 years
54.2 mm (2.1 in)
Longer than the 62 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, 62 years of values from 1952 to 2019.
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: 58.9 mm (2.3 in) in 1956; 52.3 mm (2.1 in) in 1958; 49.0 mm (1.9 in) in 1990.
Station Changes
2 suspected
2 changes were suspected in the annual mean temperature of Nezperce, at 1974 and 1987. Each is measured against neighbouring stations.
Relative to 5 neighbouring stations, the station's annual mean temperature from 1974 ran 0.2 C (0.3 F) higher than in the years before (possible change).
Relative to 5 neighbouring stations, the station's annual mean temperature from 1987 ran 0.3 C (0.6 F) lower than in the years before (likely change).
Suspected changes in the annual mean temperature at Nezperce, against neighbouring stations
Year
Shift (C)
Shift (F)
Strength
Neighbours
1974
+0.2
+0.3
possible
5
1987
-0.3
-0.6
likely
5
Possible change at the station (a move, a new instrument or a new site); the record is kept as measured. A "likely" change has a larger test statistic than a "possible" one. Neither says why the station differs from its neighbours. How changes are found, and the largest ones.
Download the Data
Data for Nezperce standing records by year: CSV or JSON. Field meanings are on the data page.
Data for Nezperce 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.