Record envelope, standing records and threshold days for Ft Pierre 17 WSW (USC00393076), South Dakota, United States, with 56 years of record.
Key Facts for Ft Pierre 17 WSW
Ft Pierre 17 WSW (USC00393076) is a weather station in South Dakota, United States at 44.24 latitude and -100.66 longitude, 485 m (1,590 ft) above sea level.
The station reports from 1964 to 2019, 56 years of record.
1,464 records set at Ft Pierre 17 WSW still stand.
Records are tracked for prcp, snow, snwd: an element needs 30 years of data to be eligible.
Ft Pierre 17 WSW set an all-time record daily snowfall of 33.0 cm (13.0 in) on 12 April 2019.
About the Station
Location: South Dakota, United States, 44.24 latitude, -100.66 longitude.
Elevation: 485 m (1,590 ft).
Period of record: 1964 to 2019, 56 years.
Eligible elements: 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 Ft Pierre 17 WSW. 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 Ft Pierre 17 WSW, with 2026 drawn through them
Month
Highest record high
Lowest record low
2026 highest maximum
2026 lowest minimum
Jan
23.9 C (75.0 F)
-42.2 C (-44.0 F)
n/a
n/a
Feb
25.0 C (77.0 F)
-43.9 C (-47.0 F)
n/a
n/a
Mar
31.1 C (88.0 F)
-32.2 C (-26.0 F)
n/a
n/a
Apr
37.2 C (99.0 F)
-16.7 C (1.9 F)
n/a
n/a
May
40.6 C (105.1 F)
-7.2 C (19.0 F)
n/a
n/a
Jun
43.9 C (111.0 F)
0.0 C (32.0 F)
n/a
n/a
Jul
48.9 C (120.0 F)
6.1 C (43.0 F)
n/a
n/a
Aug
43.9 C (111.0 F)
2.8 C (37.0 F)
n/a
n/a
Sep
43.3 C (109.9 F)
-7.8 C (18.0 F)
n/a
n/a
Oct
38.3 C (100.9 F)
-19.4 C (-2.9 F)
n/a
n/a
Nov
30.6 C (87.1 F)
-26.7 C (-16.1 F)
n/a
n/a
Dec
23.9 C (75.0 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 Ft Pierre 17 WSW still stand. 2006 holds the most, with 74.
Standing records at Ft Pierre 17 WSW by the year they were set
Year set
Standing records
1989
28
1990
61
1991
71
1992
66
1993
40
1994
53
1995
45
1996
62
1997
52
1998
45
1999
50
2000
63
2001
41
2002
72
2003
50
2004
46
2005
67
2006
74
2007
59
2008
40
2009
44
2010
43
2011
49
2012
33
2013
12
2014
46
2016
33
2017
70
2018
45
2019
4
All-Time Record Progression
5 new records
5 all-time records were set at Ft Pierre 17 WSW between 22 December 1996 and 12 April 2019. Each dot is a new record.
When Ft Pierre 17 WSW set new all-time records
Date
Kind
Detail
1996-12-22
Record snow depth
Record snow depth 48.3 cm (19.0 in)
1996-12-23
Record snow depth
Record snow depth 63.5 cm (25.0 in)
1996-12-25
Record snow depth
Record snow depth 71.1 cm (28.0 in)
1999-09-03
Record daily precipitation
Record daily precipitation 111.3 mm (4.4 in)
2019-04-12
Record daily snowfall
Record daily snowfall 33.0 cm (13.0 in)
Wettest Day of Each Month
Sep: 111.3 mm (4.4 in)
The wettest day on record for each calendar month at Ft Pierre 17 WSW. The most was 111.3 mm (4.4 in) on 3 September 1999.
Record daily precipitation for each month at Ft Pierre 17 WSW
Month
Record daily precipitation (mm)
Date
Jan
16.3 mm (0.6 in)
3 January 1997
Feb
29.0 mm (1.1 in)
9 February 2009
Mar
43.7 mm (1.7 in)
29 March 1977
Apr
55.4 mm (2.2 in)
20 April 1971
May
48.3 mm (1.9 in)
14 May 1982
Jun
82.6 mm (3.3 in)
22 June 1964
Jul
64.3 mm (2.5 in)
23 July 1979
Aug
60.7 mm (2.4 in)
3 August 2005
Sep
111.3 mm (4.4 in)
3 September 1999
Oct
75.4 mm (3.0 in)
5 October 1995
Nov
27.9 mm (1.1 in)
8 November 1977
Dec
26.2 mm (1.0 in)
29 December 2016
Period of Record Coverage
1989 to 2019
Complete yearUnder 90 percent of days
30 years of record at Ft Pierre 17 WSW, 1989 to 2019. 7 years have data for under 90 percent of days and are left out of rankings: 1989, 2001, 2012, 2013, 2014, 2016, 2019.
Cooler than the station meanWarmer than the station mean
One stripe for each of 21 complete years at Ft Pierre 17 WSW, 1990 to 2017. Blue stripes are years cooler than the station's own mean of 9.2 C (48.5 F); red stripes are warmer. The coolest year was 1993, at 7.6 C (45.6 F), and the warmest was 2006, at 10.5 C (50.9 F). The strongest colour marks a difference of 1.7 C (3.1 F).
Annual mean temperature at Ft Pierre 17 WSW as warming stripes, 1990 to 2017
Year
Annual mean temperature
Difference from the station mean
1990
10.0 C
+0.83 C
1991
10.0 C
+0.86 C
1992
9.3 C
+0.13 C
1993
7.6 C
-1.61 C
1994
8.8 C
-0.38 C
1995
8.7 C
-0.48 C
1997
8.6 C
-0.58 C
1998
9.9 C
+0.71 C
1999
10.2 C
+1.07 C
2000
9.1 C
-0.09 C
2002
9.5 C
+0.35 C
2003
9.3 C
+0.11 C
2004
9.6 C
+0.41 C
2005
9.9 C
+0.74 C
2006
10.5 C
+1.33 C
2007
10.1 C
+0.88 C
2008
8.3 C
-0.90 C
2009
8.0 C
-1.21 C
2010
8.1 C
-1.06 C
2011
8.3 C
-0.90 C
2017
8.9 C
-0.27 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
1964 to 2019
Yearly extremes at Ft Pierre 17 WSW: the record and the median year
Measure
Record
Year of the record
Median year
Years with a value
Hottest day (TXx)
48.9 C (120.0 F)
2006
41.1 C (106.0 F)
30
Coldest night (TNn)
-43.9 C (-47.0 F)
1994
-31.1 C (-24.0 F)
30
Wettest day (Rx1day)
111.3 mm (4.4 in)
1999
42.2 mm (1.7 in)
55
Wettest five days (Rx5day)
170.3 mm (6.7 in)
1999
62.0 mm (2.4 in)
55
Longest dry spell (CDD)
72 days
1964
38 days
55
Hottest day (TXx)
The hottest day of the year at Ft Pierre 17 WSW, 1964 to 2019. The record is 48.9 C (120.0 F) in 2006, marked on the chart; the median year is 41.1 C (106.0 F).
Hottest day (TXx) at Ft Pierre 17 WSW by year
Year
Hottest day (TXx)
1964
n/a
1965
n/a
1966
n/a
1967
n/a
1968
n/a
1969
n/a
1970
n/a
1971
n/a
1972
n/a
1973
n/a
1974
n/a
1975
n/a
1976
n/a
1977
n/a
1978
n/a
1979
n/a
1980
n/a
1981
n/a
1982
n/a
1983
n/a
1984
n/a
1986
n/a
1987
n/a
1988
n/a
1989
29.4 C (84.9 F)
1990
41.1 C (106.0 F)
1991
43.9 C (111.0 F)
1992
40.6 C (105.1 F)
1993
38.3 C (100.9 F)
1994
41.1 C (106.0 F)
1995
40.0 C (104.0 F)
1996
40.6 C (105.1 F)
1997
37.8 C (100.0 F)
1998
42.2 C (108.0 F)
1999
43.3 C (109.9 F)
2000
42.2 C (108.0 F)
2001
43.3 C (109.9 F)
2002
43.9 C (111.0 F)
2003
43.9 C (111.0 F)
2004
38.9 C (102.0 F)
2005
41.7 C (107.1 F)
2006
48.9 C (120.0 F)
2007
42.8 C (109.0 F)
2008
38.3 C (100.9 F)
2009
37.2 C (99.0 F)
2010
43.3 C (109.9 F)
2011
39.4 C (102.9 F)
2012
40.6 C (105.1 F)
2013
35.0 C (95.0 F)
2014
41.1 C (106.0 F)
2015
n/a
2016
44.4 C (111.9 F)
2017
42.8 C (109.0 F)
2018
41.1 C (106.0 F)
2019
33.9 C (93.0 F)
Coldest night (TNn)
The coldest night of the year at Ft Pierre 17 WSW, 1964 to 2019. The record is -43.9 C (-47.0 F) in 1994, marked on the chart; the median year is -31.1 C (-24.0 F).
Coldest night (TNn) at Ft Pierre 17 WSW by year
Year
Coldest night (TNn)
1964
n/a
1965
n/a
1966
n/a
1967
n/a
1968
n/a
1969
n/a
1970
n/a
1971
n/a
1972
n/a
1973
n/a
1974
n/a
1975
n/a
1976
n/a
1977
n/a
1978
n/a
1979
n/a
1980
n/a
1981
n/a
1982
n/a
1983
n/a
1984
n/a
1986
n/a
1987
n/a
1988
n/a
1989
-35.0 C (-31.0 F)
1990
-40.0 C (-40.0 F)
1991
-31.1 C (-24.0 F)
1992
-25.0 C (-13.0 F)
1993
-31.7 C (-25.1 F)
1994
-43.9 C (-47.0 F)
1995
-27.2 C (-17.0 F)
1996
-35.6 C (-32.1 F)
1997
-28.3 C (-18.9 F)
1998
-34.4 C (-29.9 F)
1999
-33.3 C (-27.9 F)
2000
-32.8 C (-27.0 F)
2001
-30.0 C (-22.0 F)
2002
-26.1 C (-15.0 F)
2003
-30.6 C (-23.1 F)
2004
-30.0 C (-22.0 F)
2005
-35.6 C (-32.1 F)
2006
-28.3 C (-18.9 F)
2007
-34.4 C (-29.9 F)
2008
-30.0 C (-22.0 F)
2009
-31.1 C (-24.0 F)
2010
-35.6 C (-32.1 F)
2011
-31.1 C (-24.0 F)
2012
-25.0 C (-13.0 F)
2013
-37.2 C (-35.0 F)
2014
-31.1 C (-24.0 F)
2015
n/a
2016
-34.4 C (-29.9 F)
2017
-30.6 C (-23.1 F)
2018
-42.2 C (-44.0 F)
2019
-7.8 C (18.0 F)
Wettest day (Rx1day)
The wettest day of the year at Ft Pierre 17 WSW, 1964 to 2019. The record is 111.3 mm (4.4 in) in 1999, marked on the chart; the median year is 42.2 mm (1.7 in).
Wettest day (Rx1day) at Ft Pierre 17 WSW by year
Year
Wettest day (Rx1day)
1964
82.6 mm (3.3 in)
1965
26.7 mm (1.1 in)
1966
63.5 mm (2.5 in)
1967
27.9 mm (1.1 in)
1968
47.8 mm (1.9 in)
1969
45.7 mm (1.8 in)
1970
43.2 mm (1.7 in)
1971
55.4 mm (2.2 in)
1972
29.0 mm (1.1 in)
1973
41.9 mm (1.6 in)
1974
45.7 mm (1.8 in)
1975
37.8 mm (1.5 in)
1976
13.5 mm (0.5 in)
1977
64.3 mm (2.5 in)
1978
24.6 mm (1.0 in)
1979
64.3 mm (2.5 in)
1980
43.4 mm (1.7 in)
1981
23.6 mm (0.9 in)
1982
49.3 mm (1.9 in)
1983
42.2 mm (1.7 in)
1984
7.6 mm (0.30 in)
1986
41.1 mm (1.6 in)
1987
26.7 mm (1.1 in)
1988
58.7 mm (2.3 in)
1989
39.9 mm (1.6 in)
1990
35.3 mm (1.4 in)
1991
42.4 mm (1.7 in)
1992
30.7 mm (1.2 in)
1993
32.3 mm (1.3 in)
1994
38.9 mm (1.5 in)
1995
75.4 mm (3.0 in)
1996
43.2 mm (1.7 in)
1997
45.7 mm (1.8 in)
1998
45.2 mm (1.8 in)
1999
111.3 mm (4.4 in)
2000
42.7 mm (1.7 in)
2001
27.9 mm (1.1 in)
2002
36.1 mm (1.4 in)
2003
41.9 mm (1.6 in)
2004
54.1 mm (2.1 in)
2005
60.7 mm (2.4 in)
2006
35.8 mm (1.4 in)
2007
51.1 mm (2.0 in)
2008
38.1 mm (1.5 in)
2009
45.7 mm (1.8 in)
2010
37.1 mm (1.5 in)
2011
70.9 mm (2.8 in)
2012
42.4 mm (1.7 in)
2013
59.4 mm (2.3 in)
2014
52.6 mm (2.1 in)
2015
13.5 mm (0.5 in)
2016
31.2 mm (1.2 in)
2017
33.0 mm (1.3 in)
2018
39.4 mm (1.6 in)
2019
21.6 mm (0.9 in)
Wettest five days (Rx5day)
The wettest five days of the year at Ft Pierre 17 WSW, 1964 to 2019. The record is 170.3 mm (6.7 in) in 1999, marked on the chart; the median year is 62.0 mm (2.4 in).
Wettest five days (Rx5day) at Ft Pierre 17 WSW by year
Year
Wettest five days (Rx5day)
1964
90.7 mm (3.6 in)
1965
46.0 mm (1.8 in)
1966
100.8 mm (4.0 in)
1967
62.0 mm (2.4 in)
1968
108.8 mm (4.3 in)
1969
84.3 mm (3.3 in)
1970
62.0 mm (2.4 in)
1971
105.5 mm (4.2 in)
1972
69.6 mm (2.7 in)
1973
76.2 mm (3.0 in)
1974
69.6 mm (2.7 in)
1975
38.3 mm (1.5 in)
1976
21.2 mm (0.8 in)
1977
72.7 mm (2.9 in)
1978
65.7 mm (2.6 in)
1979
76.2 mm (3.0 in)
1980
66.5 mm (2.6 in)
1981
44.4 mm (1.7 in)
1982
98.8 mm (3.9 in)
1983
42.2 mm (1.7 in)
1984
12.7 mm (0.5 in)
1986
67.4 mm (2.7 in)
1987
53.8 mm (2.1 in)
1988
64.8 mm (2.6 in)
1989
77.5 mm (3.1 in)
1990
49.5 mm (1.9 in)
1991
104.9 mm (4.1 in)
1992
59.2 mm (2.3 in)
1993
37.9 mm (1.5 in)
1994
60.0 mm (2.4 in)
1995
91.5 mm (3.6 in)
1996
91.2 mm (3.6 in)
1997
57.2 mm (2.3 in)
1998
63.2 mm (2.5 in)
1999
170.3 mm (6.7 in)
2000
49.6 mm (2.0 in)
2001
44.5 mm (1.8 in)
2002
38.6 mm (1.5 in)
2003
53.4 mm (2.1 in)
2004
69.9 mm (2.8 in)
2005
60.7 mm (2.4 in)
2006
48.0 mm (1.9 in)
2007
56.5 mm (2.2 in)
2008
84.3 mm (3.3 in)
2009
60.7 mm (2.4 in)
2010
61.9 mm (2.4 in)
2011
101.9 mm (4.0 in)
2012
49.3 mm (1.9 in)
2013
88.9 mm (3.5 in)
2014
57.0 mm (2.2 in)
2015
13.5 mm (0.5 in)
2016
72.6 mm (2.9 in)
2017
33.5 mm (1.3 in)
2018
46.4 mm (1.8 in)
2019
21.6 mm (0.9 in)
Longest dry spell (CDD)
The longest dry spell of the year at Ft Pierre 17 WSW, 1964 to 2019. The record is 72 days in 1964, marked on the chart; the median year is 38 days.
Longest dry spell (CDD) at Ft Pierre 17 WSW by year
Year
Longest dry spell (CDD)
1964
72 days
1965
23 days
1966
39 days
1967
71 days
1968
28 days
1969
40 days
1970
23 days
1971
41 days
1972
25 days
1973
22 days
1974
35 days
1975
29 days
1976
39 days
1977
24 days
1978
25 days
1979
38 days
1980
31 days
1981
46 days
1982
38 days
1983
42 days
1984
54 days
1986
42 days
1987
53 days
1988
41 days
1989
30 days
1990
42 days
1991
39 days
1992
32 days
1993
26 days
1994
30 days
1995
27 days
1996
26 days
1997
32 days
1998
40 days
1999
42 days
2000
31 days
2001
31 days
2002
33 days
2003
38 days
2004
60 days
2005
41 days
2006
28 days
2007
40 days
2008
20 days
2009
25 days
2010
53 days
2011
42 days
2012
39 days
2013
21 days
2014
41 days
2015
14 days
2016
55 days
2017
46 days
2018
62 days
2019
7 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
21 years with a frost
Across 21 years with a frost, the median last spring frost at Ft Pierre 17 WSW falls on 14 May and the median first autumn frost on 22 September, which leaves a median of 136 days between them.
Frost dates and growing season at Ft Pierre 17 WSW
Measure
Median, all years
Earliest period
Recent period (1990 to 2017)
Recent against earliest
Fitted trend
Last spring frost
14 May
n/a
14 May
n/a
n/a
First autumn frost
22 September
n/a
22 September
n/a
n/a
Growing days
136 days
n/a
136 days
n/a
n/a
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
46 years, 1965 to 2018
A day with at least 41.5 mm (1.6 in) of rain is expected about once in 2 years. A day with at least 96.4 mm (3.8 in) of rain is expected about once in 100 years.
Rainfall return levels at Ft Pierre 17 WSW: the daily rain expected about once in a given number of years
Expected about once in
A day with at least
Note
2 years
41.5 mm (1.6 in)
5 years
55.1 mm (2.2 in)
10 years
64.5 mm (2.5 in)
25 years
76.9 mm (3.0 in)
50 years
86.5 mm (3.4 in)
Longer than the 46 years of record
100 years
96.4 mm (3.8 in)
Longer than the 46 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, 46 years of values from 1965 to 2018.
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: 111.3 mm (4.4 in) in 1999; 75.4 mm (3.0 in) in 1995; 70.9 mm (2.8 in) in 2011.
Download the Data
Data for Ft Pierre 17 WSW standing records by year: CSV or JSON. Field meanings are on the data page.
Data for Ft Pierre 17 WSW 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.