Record envelope, standing records and threshold days for Highmore 23 N (USC00393838), South Dakota, United States, with 60 years of record.
Key Facts for Highmore 23 N
Highmore 23 N (USC00393838) is a weather station in South Dakota, United States at 44.84 latitude and -99.49 longitude, 570 m (1,870 ft) above sea level.
The station reports from 1952 to 2011, 60 years of record.
1,464 records set at Highmore 23 N still stand.
Records are tracked for tmax, tmin, prcp, snow, snwd: an element needs 30 years of data to be eligible.
Highmore 23 N set a daily record high minimum temperature of 15.0 C (59.0 F) on 5 October 2011.
About the Station
Location: South Dakota, United States, 44.84 latitude, -99.49 longitude.
Elevation: 570 m (1,870 ft).
Period of record: 1952 to 2011, 60 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 Highmore 23 N. 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 Highmore 23 N, with 2026 drawn through them
Month
Highest record high
Lowest record low
2026 highest maximum
2026 lowest minimum
Jan
18.3 C (64.9 F)
-38.9 C (-38.0 F)
n/a
n/a
Feb
22.2 C (72.0 F)
-38.9 C (-38.0 F)
n/a
n/a
Mar
27.8 C (82.0 F)
-30.0 C (-22.0 F)
n/a
n/a
Apr
35.6 C (96.1 F)
-20.6 C (-5.1 F)
n/a
n/a
May
38.3 C (100.9 F)
-9.4 C (15.1 F)
n/a
n/a
Jun
43.3 C (109.9 F)
-2.2 C (28.0 F)
n/a
n/a
Jul
45.0 C (113.0 F)
0.0 C (32.0 F)
n/a
n/a
Aug
45.6 C (114.1 F)
-0.6 C (30.9 F)
n/a
n/a
Sep
40.6 C (105.1 F)
-11.7 C (10.9 F)
n/a
n/a
Oct
35.0 C (95.0 F)
-18.3 C (-0.9 F)
n/a
n/a
Nov
27.2 C (81.0 F)
-33.3 C (-27.9 F)
n/a
n/a
Dec
18.9 C (66.0 F)
-38.9 C (-38.0 F)
n/a
n/a
Which Years Hold Standing Records
1,464 standing records
Year with most
1,464 records at Highmore 23 N still stand. 1991 holds the most, with 54.
Standing records at Highmore 23 N by the year they were set
Year set
Standing records
1963
13
1964
44
1965
46
1966
47
1967
37
1968
40
1969
32
1970
26
1971
27
1972
34
1973
18
1974
30
1975
21
1976
43
1977
30
1978
24
1979
20
1980
23
1981
35
1982
14
1983
37
1984
28
1985
50
1986
29
1987
48
1988
53
1989
46
1990
42
1991
54
1992
38
1993
22
1994
32
1995
24
1996
27
1997
26
1998
22
1999
21
2000
28
2001
17
2002
25
2003
32
2004
20
2005
21
2006
26
2007
27
2008
14
2009
32
2010
3
2011
16
All-Time Record Progression
3 new records
3 all-time records were set at Highmore 23 N between 4 March 1985 and 8 July 1994. Each dot is a new record.
When Highmore 23 N set new all-time records
Date
Kind
Detail
1985-03-04
Record snow depth
Record snow depth 61.0 cm (24.0 in)
1991-02-18
Record daily snowfall
Record daily snowfall 35.6 cm (14.0 in)
1994-07-08
Record daily precipitation
Record daily precipitation 162.6 mm (6.4 in)
Wettest Day of Each Month
Jul: 162.6 mm (6.4 in)
The wettest day on record for each calendar month at Highmore 23 N. The most was 162.6 mm (6.4 in) on 8 July 1994.
Record daily precipitation for each month at Highmore 23 N
Month
Record daily precipitation (mm)
Date
Jan
36.6 mm (1.4 in)
4 January 1997
Feb
26.4 mm (1.0 in)
18 February 1991
Mar
45.7 mm (1.8 in)
31 March 1981
Apr
62.0 mm (2.4 in)
28 April 1989
May
51.3 mm (2.0 in)
1 May 1972
Jun
135.6 mm (5.3 in)
25 June 1969
Jul
162.6 mm (6.4 in)
8 July 1994
Aug
114.3 mm (4.5 in)
25 August 1960
Sep
70.6 mm (2.8 in)
12 September 1985
Oct
44.7 mm (1.8 in)
9 October 1982
Nov
55.9 mm (2.2 in)
27 November 1994
Dec
37.3 mm (1.5 in)
1 December 2007
Period of Record Coverage
1963 to 2011
Complete yearUnder 90 percent of days
49 years of record at Highmore 23 N, 1963 to 2011. 14 years have data for under 90 percent of days and are left out of rankings: 1963, 1965, 1993, 1994, 1995, 1996, 1998, 1999 and others.
Cooler than the station meanWarmer than the station mean
One stripe for each of 34 complete years at Highmore 23 N, 1964 to 2008. Blue stripes are years cooler than the station's own mean of 7.0 C (44.6 F); red stripes are warmer. The coolest year was 1993, at 5.2 C (41.3 F), and the warmest was 1987, at 9.1 C (48.3 F). The strongest colour marks a difference of 2.1 C (3.8 F).
Annual mean temperature at Highmore 23 N as warming stripes, 1964 to 2008
Year
Annual mean temperature
Difference from the station mean
1964
6.6 C
-0.43 C
1967
6.4 C
-0.61 C
1968
6.4 C
-0.60 C
1969
6.1 C
-0.90 C
1970
6.2 C
-0.78 C
1971
6.3 C
-0.75 C
1972
5.5 C
-1.55 C
1973
7.7 C
+0.68 C
1974
7.7 C
+0.68 C
1975
6.6 C
-0.45 C
1976
7.8 C
+0.83 C
1977
7.5 C
+0.46 C
1978
5.5 C
-1.47 C
1979
5.7 C
-1.31 C
1980
7.9 C
+0.94 C
1981
8.4 C
+1.44 C
1982
6.1 C
-0.86 C
1983
7.5 C
+0.45 C
1984
7.3 C
+0.30 C
1985
5.8 C
-1.21 C
1986
7.5 C
+0.47 C
1987
9.1 C
+2.08 C
1988
7.7 C
+0.68 C
1989
6.6 C
-0.42 C
1990
8.3 C
+1.33 C
1991
8.3 C
+1.29 C
1992
7.5 C
+0.49 C
1993
5.2 C
-1.84 C
1995
6.6 C
-0.42 C
2003
7.6 C
+0.62 C
2004
7.3 C
+0.31 C
2005
7.7 C
+0.70 C
2006
8.3 C
+1.29 C
2008
5.5 C
-1.51 C
The fitted trend in annual mean temperature here over 1964 to 2008 is 0.2 C (-0.1 to 0.5) per decade. The interval includes zero, so the trend is not clearly different from zero. In Fahrenheit: 0.4 F (-0.2 to 0.9) per decade. The slope is a straight line fitted to 34 complete years; the brackets give its 95 percent interval.
Fitted temperature trends per decade at Highmore 23 N
Measure
Per decade (C)
Per decade (F)
Period
Complete years
Reading
Annual mean temperature
0.2 C (-0.1 to 0.5) per decade
0.4 F (-0.2 to 0.9) per decade
1964 to 2008
34
Not clearly different from zero
Mean daily maximum
0.1 C (-0.3 to 0.5) per decade
0.1 F (-0.6 to 0.9) per decade
1964 to 2008
34
Not clearly different from zero
Mean daily minimum
0.3 C (0.1 to 0.6) per decade
0.6 F (0.2 to 1.0) per decade
1964 to 2008
34
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
1952 to 2011
Yearly extremes at Highmore 23 N: the record and the median year
Measure
Record
Year of the record
Median year
Years with a value
Hottest day (TXx)
45.6 C (114.1 F)
1965
38.9 C (102.0 F)
49
Coldest night (TNn)
-38.9 C (-38.0 F)
1972
-31.7 C (-25.1 F)
49
Wettest day (Rx1day)
162.6 mm (6.4 in)
1994
45.0 mm (1.8 in)
60
Wettest five days (Rx5day)
181.9 mm (7.2 in)
1994
68.6 mm (2.7 in)
60
Longest dry spell (CDD)
93 days
2006
38 days
60
Hottest day (TXx)
The hottest day of the year at Highmore 23 N, 1952 to 2011. The record is 45.6 C (114.1 F) in 1965, marked on the chart; the median year is 38.9 C (102.0 F).
Hottest day (TXx) at Highmore 23 N by year
Year
Hottest day (TXx)
1952
n/a
1953
n/a
1954
n/a
1955
n/a
1956
n/a
1957
n/a
1958
n/a
1959
n/a
1960
n/a
1961
n/a
1962
n/a
1963
38.9 C (102.0 F)
1964
38.3 C (100.9 F)
1965
45.6 C (114.1 F)
1966
43.9 C (111.0 F)
1967
38.3 C (100.9 F)
1968
36.7 C (98.1 F)
1969
38.3 C (100.9 F)
1970
38.9 C (102.0 F)
1971
39.4 C (102.9 F)
1972
36.1 C (97.0 F)
1973
41.7 C (107.1 F)
1974
41.1 C (106.0 F)
1975
41.7 C (107.1 F)
1976
42.2 C (108.0 F)
1977
42.2 C (108.0 F)
1978
40.0 C (104.0 F)
1979
38.3 C (100.9 F)
1980
42.2 C (108.0 F)
1981
37.2 C (99.0 F)
1982
39.4 C (102.9 F)
1983
40.0 C (104.0 F)
1984
37.8 C (100.0 F)
1985
41.7 C (107.1 F)
1986
36.7 C (98.1 F)
1987
40.6 C (105.1 F)
1988
43.3 C (109.9 F)
1989
43.9 C (111.0 F)
1990
36.7 C (98.1 F)
1991
40.6 C (105.1 F)
1992
36.7 C (98.1 F)
1993
33.3 C (91.9 F)
1994
34.4 C (93.9 F)
1995
37.2 C (99.0 F)
1996
35.6 C (96.1 F)
1997
35.0 C (95.0 F)
1998
38.3 C (100.9 F)
1999
40.0 C (104.0 F)
2000
39.4 C (102.9 F)
2001
39.4 C (102.9 F)
2002
41.7 C (107.1 F)
2003
42.2 C (108.0 F)
2004
35.6 C (96.1 F)
2005
40.0 C (104.0 F)
2006
45.0 C (113.0 F)
2007
38.9 C (102.0 F)
2008
37.2 C (99.0 F)
2009
34.4 C (93.9 F)
2010
25.6 C (78.1 F)
2011
38.3 C (100.9 F)
Coldest night (TNn)
The coldest night of the year at Highmore 23 N, 1952 to 2011. The record is -38.9 C (-38.0 F) in 1972, marked on the chart; the median year is -31.7 C (-25.1 F).
Coldest night (TNn) at Highmore 23 N by year
Year
Coldest night (TNn)
1952
n/a
1953
n/a
1954
n/a
1955
n/a
1956
n/a
1957
n/a
1958
n/a
1959
n/a
1960
n/a
1961
n/a
1962
n/a
1963
-31.1 C (-24.0 F)
1964
-33.3 C (-27.9 F)
1965
-33.3 C (-27.9 F)
1966
-36.7 C (-34.1 F)
1967
-38.3 C (-36.9 F)
1968
-35.0 C (-31.0 F)
1969
-28.9 C (-20.0 F)
1970
-36.1 C (-33.0 F)
1971
-35.0 C (-31.0 F)
1972
-38.9 C (-38.0 F)
1973
-31.1 C (-24.0 F)
1974
-31.7 C (-25.1 F)
1975
-32.8 C (-27.0 F)
1976
-31.1 C (-24.0 F)
1977
-35.0 C (-31.0 F)
1978
-33.9 C (-29.0 F)
1979
-32.2 C (-26.0 F)
1980
-30.0 C (-22.0 F)
1981
-33.9 C (-29.0 F)
1982
-33.9 C (-29.0 F)
1983
-37.2 C (-35.0 F)
1984
-32.2 C (-26.0 F)
1985
-32.2 C (-26.0 F)
1986
-28.9 C (-20.0 F)
1987
-26.7 C (-16.1 F)
1988
-38.9 C (-38.0 F)
1989
-35.0 C (-31.0 F)
1990
-38.9 C (-38.0 F)
1991
-28.9 C (-20.0 F)
1992
-26.7 C (-16.1 F)
1993
-30.6 C (-23.1 F)
1994
-38.9 C (-38.0 F)
1995
-26.7 C (-16.1 F)
1996
-35.0 C (-31.0 F)
1997
-29.4 C (-20.9 F)
1998
-31.1 C (-24.0 F)
1999
-31.1 C (-24.0 F)
2000
-29.4 C (-20.9 F)
2001
-27.2 C (-17.0 F)
2002
-23.3 C (-9.9 F)
2003
-28.3 C (-18.9 F)
2004
-28.3 C (-18.9 F)
2005
-35.6 C (-32.1 F)
2006
-25.0 C (-13.0 F)
2007
-31.7 C (-25.1 F)
2008
-29.4 C (-20.9 F)
2009
-32.8 C (-27.0 F)
2010
-29.4 C (-20.9 F)
2011
-29.4 C (-20.9 F)
Wettest day (Rx1day)
The wettest day of the year at Highmore 23 N, 1952 to 2011. The record is 162.6 mm (6.4 in) in 1994, marked on the chart; the median year is 45.0 mm (1.8 in).
Wettest day (Rx1day) at Highmore 23 N by year
Year
Wettest day (Rx1day)
1952
27.9 mm (1.1 in)
1953
62.2 mm (2.4 in)
1954
38.1 mm (1.5 in)
1955
35.6 mm (1.4 in)
1956
50.8 mm (2.0 in)
1957
53.3 mm (2.1 in)
1958
30.5 mm (1.2 in)
1959
41.9 mm (1.6 in)
1960
114.3 mm (4.5 in)
1961
33.3 mm (1.3 in)
1962
63.5 mm (2.5 in)
1963
50.8 mm (2.0 in)
1964
50.8 mm (2.0 in)
1965
35.6 mm (1.4 in)
1966
62.7 mm (2.5 in)
1967
42.9 mm (1.7 in)
1968
49.5 mm (1.9 in)
1969
135.6 mm (5.3 in)
1970
38.1 mm (1.5 in)
1971
63.5 mm (2.5 in)
1972
51.3 mm (2.0 in)
1973
31.0 mm (1.2 in)
1974
34.8 mm (1.4 in)
1975
26.2 mm (1.0 in)
1976
17.0 mm (0.7 in)
1977
32.8 mm (1.3 in)
1978
34.8 mm (1.4 in)
1979
48.5 mm (1.9 in)
1980
48.8 mm (1.9 in)
1981
93.0 mm (3.7 in)
1982
44.7 mm (1.8 in)
1983
65.8 mm (2.6 in)
1984
56.6 mm (2.2 in)
1985
70.6 mm (2.8 in)
1986
37.1 mm (1.5 in)
1987
43.7 mm (1.7 in)
1988
28.7 mm (1.1 in)
1989
62.0 mm (2.4 in)
1990
40.1 mm (1.6 in)
1991
49.5 mm (1.9 in)
1992
35.6 mm (1.4 in)
1993
50.8 mm (2.0 in)
1994
162.6 mm (6.4 in)
1995
43.2 mm (1.7 in)
1996
62.7 mm (2.5 in)
1997
45.7 mm (1.8 in)
1998
36.8 mm (1.4 in)
1999
50.3 mm (2.0 in)
2000
31.8 mm (1.3 in)
2001
38.1 mm (1.5 in)
2002
30.0 mm (1.2 in)
2003
45.2 mm (1.8 in)
2004
42.4 mm (1.7 in)
2005
33.3 mm (1.3 in)
2006
50.8 mm (2.0 in)
2007
67.6 mm (2.7 in)
2008
42.2 mm (1.7 in)
2009
66.0 mm (2.6 in)
2010
13.5 mm (0.5 in)
2011
53.3 mm (2.1 in)
Wettest five days (Rx5day)
The wettest five days of the year at Highmore 23 N, 1952 to 2011. The record is 181.9 mm (7.2 in) in 1994, marked on the chart; the median year is 68.6 mm (2.7 in).
Wettest five days (Rx5day) at Highmore 23 N by year
Year
Wettest five days (Rx5day)
1952
54.1 mm (2.1 in)
1953
70.3 mm (2.8 in)
1954
63.5 mm (2.5 in)
1955
56.7 mm (2.2 in)
1956
66.1 mm (2.6 in)
1957
95.3 mm (3.8 in)
1958
47.0 mm (1.9 in)
1959
76.2 mm (3.0 in)
1960
116.1 mm (4.6 in)
1961
85.1 mm (3.4 in)
1962
85.1 mm (3.4 in)
1963
51.3 mm (2.0 in)
1964
99.9 mm (3.9 in)
1965
39.1 mm (1.5 in)
1966
65.5 mm (2.6 in)
1967
73.9 mm (2.9 in)
1968
66.3 mm (2.6 in)
1969
135.6 mm (5.3 in)
1970
65.1 mm (2.6 in)
1971
70.4 mm (2.8 in)
1972
65.0 mm (2.6 in)
1973
57.9 mm (2.3 in)
1974
49.3 mm (1.9 in)
1975
60.7 mm (2.4 in)
1976
19.5 mm (0.8 in)
1977
63.5 mm (2.5 in)
1978
57.2 mm (2.3 in)
1979
83.6 mm (3.3 in)
1980
92.2 mm (3.6 in)
1981
95.0 mm (3.7 in)
1982
100.8 mm (4.0 in)
1983
80.8 mm (3.2 in)
1984
75.4 mm (3.0 in)
1985
90.2 mm (3.6 in)
1986
71.2 mm (2.8 in)
1987
49.3 mm (1.9 in)
1988
39.2 mm (1.5 in)
1989
90.0 mm (3.5 in)
1990
72.6 mm (2.9 in)
1991
127.2 mm (5.0 in)
1992
48.3 mm (1.9 in)
1993
73.9 mm (2.9 in)
1994
181.9 mm (7.2 in)
1995
60.2 mm (2.4 in)
1996
111.2 mm (4.4 in)
1997
55.2 mm (2.2 in)
1998
79.1 mm (3.1 in)
1999
80.5 mm (3.2 in)
2000
46.0 mm (1.8 in)
2001
47.2 mm (1.9 in)
2002
39.7 mm (1.6 in)
2003
69.1 mm (2.7 in)
2004
59.0 mm (2.3 in)
2005
54.8 mm (2.2 in)
2006
66.0 mm (2.6 in)
2007
81.3 mm (3.2 in)
2008
68.1 mm (2.7 in)
2009
79.8 mm (3.1 in)
2010
21.1 mm (0.8 in)
2011
91.4 mm (3.6 in)
Longest dry spell (CDD)
The longest dry spell of the year at Highmore 23 N, 1952 to 2011. The record is 93 days in 2006, marked on the chart; the median year is 38 days.
Longest dry spell (CDD) at Highmore 23 N by year
Year
Longest dry spell (CDD)
1952
78 days
1953
30 days
1954
70 days
1955
40 days
1956
39 days
1957
32 days
1958
51 days
1959
57 days
1960
31 days
1961
39 days
1962
46 days
1963
36 days
1964
58 days
1965
38 days
1966
35 days
1967
39 days
1968
78 days
1969
20 days
1970
24 days
1971
38 days
1972
34 days
1973
26 days
1974
37 days
1975
29 days
1976
34 days
1977
16 days
1978
28 days
1979
41 days
1980
31 days
1981
43 days
1982
41 days
1983
54 days
1984
42 days
1985
45 days
1986
44 days
1987
45 days
1988
39 days
1989
25 days
1990
31 days
1991
47 days
1992
37 days
1993
21 days
1994
33 days
1995
31 days
1996
30 days
1997
47 days
1998
49 days
1999
85 days
2000
56 days
2001
35 days
2002
51 days
2003
41 days
2004
36 days
2005
29 days
2006
93 days
2007
46 days
2008
38 days
2009
31 days
2010
27 days
2011
25 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
34 years with a frost
Across 34 years with a frost, the median last spring frost at Highmore 23 N falls on 17 May and the median first autumn frost on 20 September, which leaves a median of 128 days between them.
Fitted over all years, the growing season changes by +7.6 days per decade at this station.
Frost dates and growing season at Highmore 23 N
Measure
Median, all years
Earliest period
Recent period (1970 to 2008)
Recent against earliest
Fitted trend
Last spring frost
17 May
n/a
15 May
n/a
-3.4 days per decade
First autumn frost
20 September
n/a
19 September
n/a
+4.1 days per decade
Growing days
128 days
n/a
128 days
n/a
+7.6 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
50 years, 1953 to 2009
A day with at least 44.1 mm (1.7 in) of rain is expected about once in 2 years. A day with at least 125.6 mm (4.9 in) of rain is expected about once in 100 years.
Rainfall return levels at Highmore 23 N: the daily rain expected about once in a given number of years
Expected about once in
A day with at least
Note
2 years
44.1 mm (1.7 in)
5 years
60.3 mm (2.4 in)
10 years
73.0 mm (2.9 in)
25 years
91.6 mm (3.6 in)
50 years
107.6 mm (4.2 in)
100 years
125.6 mm (4.9 in)
Longer than the 50 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, 50 years of values from 1953 to 2009.
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: 135.6 mm (5.3 in) in 1969; 114.3 mm (4.5 in) in 1960; 93.0 mm (3.7 in) in 1981.
Download the Data
Data for Highmore 23 N standing records by year: CSV or JSON. Field meanings are on the data page.
Data for Highmore 23 N 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 2026-10-16 (16 October 2026). Records are computed by this site and are not official.