Record envelope, standing records and threshold days for Riverdale (USC00327585), North Dakota, United States, with 78 years of record.
Key Facts for Riverdale
Riverdale (USC00327585) is a weather station in North Dakota, United States at 47.50 latitude and -101.38 longitude, 603 m (1,977 ft) above sea level.
The station reports from 1948 to 2025, 78 years of record.
1,464 records set at Riverdale still stand.
Records are tracked for tmax, tmin, prcp, snow, snwd: an element needs 30 years of data to be eligible.
Riverdale set a daily record precipitation of 2.8 mm (0.11 in) on 24 February 2026.
About the Station
Location: North Dakota, United States, 47.50 latitude, -101.38 longitude.
Elevation: 603 m (1,977 ft).
Period of record: 1948 to 2025, 78 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 Riverdale. 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 Riverdale, with 2026 drawn through them
Month
Highest record high
Lowest record low
2026 highest maximum
2026 lowest minimum
Jan
13.3 C (55.9 F)
-40.0 C (-40.0 F)
n/a
n/a
Feb
18.3 C (64.9 F)
-36.1 C (-33.0 F)
n/a
n/a
Mar
30.6 C (87.1 F)
-35.6 C (-32.1 F)
n/a
n/a
Apr
33.3 C (91.9 F)
-20.6 C (-5.1 F)
n/a
n/a
May
36.1 C (97.0 F)
-11.1 C (12.0 F)
n/a
n/a
Jun
37.2 C (99.0 F)
-6.7 C (19.9 F)
n/a
n/a
Jul
40.6 C (105.1 F)
1.1 C (34.0 F)
n/a
n/a
Aug
40.6 C (105.1 F)
1.1 C (34.0 F)
n/a
n/a
Sep
40.6 C (105.1 F)
-8.9 C (16.0 F)
n/a
n/a
Oct
35.0 C (95.0 F)
-14.4 C (6.1 F)
n/a
n/a
Nov
25.6 C (78.1 F)
-28.9 C (-20.0 F)
n/a
n/a
Dec
16.1 C (61.0 F)
-37.2 C (-35.0 F)
n/a
n/a
Which Years Hold Standing Records
1,464 standing records
Year with most
1,464 records at Riverdale still stand. 1950 holds the most, with 49.
Standing records at Riverdale by the year they were set
Year set
Standing records
1948
12
1949
31
1950
49
1951
43
1952
35
1953
30
1954
32
1955
33
1956
21
1957
27
1958
36
1959
42
1960
17
1961
23
1962
21
1963
34
1964
44
1965
39
1966
30
1967
21
1968
32
1969
21
1970
21
1971
12
1972
29
1973
14
1974
27
1975
17
1976
22
1977
36
1978
24
1979
22
1980
21
1981
6
1999
11
2000
16
2001
8
2002
26
2003
5
2004
19
2005
23
2006
26
2007
18
2008
7
2009
19
2010
14
2011
10
2012
38
2013
23
2014
13
2015
22
2016
27
2017
31
2018
10
2019
22
2020
16
2021
22
2022
28
2023
29
2024
25
2025
32
Wettest Day of Each Month
Jun: 105.4 mm (4.1 in)
The wettest day on record for each calendar month at Riverdale. The most was 105.4 mm (4.1 in) on 25 June 1966.
Record daily precipitation for each month at Riverdale
Month
Record daily precipitation (mm)
Date
Jan
15.2 mm (0.6 in)
8 January 1949
Feb
20.3 mm (0.8 in)
12 February 2007
Mar
45.7 mm (1.8 in)
31 March 2011
Apr
55.9 mm (2.2 in)
27 April 1964
May
55.9 mm (2.2 in)
1 May 2007
Jun
105.4 mm (4.1 in)
25 June 1966
Jul
61.2 mm (2.4 in)
17 July 1957
Aug
87.6 mm (3.4 in)
25 August 1951
Sep
84.1 mm (3.3 in)
12 September 1978
Oct
50.8 mm (2.0 in)
2 October 1971
Nov
27.9 mm (1.1 in)
3 November 2000
Dec
22.9 mm (0.9 in)
18 December 1967
Period of Record Coverage
1948 to 2025
Complete yearUnder 90 percent of days
61 years of record at Riverdale, 1948 to 2025. 20 years have data for under 90 percent of days and are left out of rankings: 1948, 1979, 1980, 1981, 1999, 2000, 2001, 2002 and others.
Cooler than the station meanWarmer than the station mean
One stripe for each of 33 complete years at Riverdale, 1951 to 2023. Blue stripes are years cooler than the station's own mean of 4.7 C (40.5 F); red stripes are warmer. The coolest year was 1951, at 2.3 C (36.2 F), and the warmest was 2012, at 7.3 C (45.2 F). The strongest colour marks a difference of 2.7 C (4.9 F).
Annual mean temperature at Riverdale as warming stripes, 1951 to 2023
Year
Annual mean temperature
Difference from the station mean
1951
2.3 C
-2.38 C
1952
5.2 C
+0.50 C
1953
5.9 C
+1.14 C
1954
5.2 C
+0.45 C
1955
4.0 C
-0.71 C
1956
4.2 C
-0.56 C
1957
4.7 C
-0.04 C
1958
4.8 C
+0.10 C
1959
4.2 C
-0.52 C
1960
4.5 C
-0.25 C
1961
5.4 C
+0.68 C
1962
4.8 C
+0.07 C
1963
5.6 C
+0.88 C
1964
4.4 C
-0.30 C
1965
3.2 C
-1.50 C
1966
3.7 C
-1.05 C
1967
4.3 C
-0.47 C
1968
4.1 C
-0.60 C
1969
4.0 C
-0.73 C
1970
3.5 C
-1.24 C
1971
4.1 C
-0.65 C
1973
5.6 C
+0.85 C
1974
4.5 C
-0.25 C
1975
4.1 C
-0.65 C
1976
5.2 C
+0.51 C
1978
3.3 C
-1.39 C
2006
7.3 C
+2.56 C
2007
6.0 C
+1.28 C
2009
4.1 C
-0.64 C
2012
7.3 C
+2.62 C
2017
5.9 C
+1.20 C
2022
4.5 C
-0.20 C
2023
6.1 C
+1.42 C
The annual mean temperature here has risen by 0.2 C (0.1 to 0.4) per decade over 1951 to 2023. In Fahrenheit: 0.4 F (0.1 to 0.7) per decade. The slope is a straight line fitted to 33 complete years; the brackets give its 95 percent interval.
Fitted temperature trends per decade at Riverdale
Measure
Per decade (C)
Per decade (F)
Period
Complete years
Reading
Annual mean temperature
0.2 C (0.1 to 0.4) per decade
0.4 F (0.1 to 0.7) per decade
1951 to 2023
33
Rise
Mean daily maximum
0.14 C (-0.03 to 0.31) per decade
0.3 F (-0.1 to 0.6) per decade
1951 to 2023
33
Not clearly different from zero
Mean daily minimum
0.3 C (0.2 to 0.5) per decade
0.6 F (0.3 to 0.9) per decade
1951 to 2023
33
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
1948 to 2026
Yearly extremes at Riverdale: the record and the median year
Measure
Record
Year of the record
Median year
Years with a value
Hottest day (TXx)
40.6 C (105.1 F)
1978
37.2 C (99.0 F)
61
Coldest night (TNn)
-40.0 C (-40.0 F)
1977
-31.7 C (-25.1 F)
61
Wettest day (Rx1day)
105.4 mm (4.1 in)
1966
40.6 mm (1.6 in)
61
Wettest five days (Rx5day)
123.4 mm (4.9 in)
1957
57.5 mm (2.3 in)
60
Longest dry spell (CDD)
82 days
1961
35 days
61
Hottest day (TXx)
The hottest day of the year at Riverdale, 1948 to 2026. The record is 40.6 C (105.1 F) in 1978, marked on the chart; the median year is 37.2 C (99.0 F).
Hottest day (TXx) at Riverdale by year
Year
Hottest day (TXx)
1948
38.9 C (102.0 F)
1949
38.9 C (102.0 F)
1950
34.4 C (93.9 F)
1951
36.1 C (97.0 F)
1952
36.7 C (98.1 F)
1953
35.6 C (96.1 F)
1954
36.7 C (98.1 F)
1955
37.8 C (100.0 F)
1956
35.0 C (95.0 F)
1957
36.7 C (98.1 F)
1958
38.3 C (100.9 F)
1959
38.3 C (100.9 F)
1960
40.0 C (104.0 F)
1961
38.3 C (100.9 F)
1962
35.0 C (95.0 F)
1963
35.6 C (96.1 F)
1964
37.8 C (100.0 F)
1965
35.6 C (96.1 F)
1966
35.6 C (96.1 F)
1967
36.1 C (97.0 F)
1968
37.2 C (99.0 F)
1969
37.8 C (100.0 F)
1970
37.2 C (99.0 F)
1971
38.9 C (102.0 F)
1972
35.6 C (96.1 F)
1973
38.3 C (100.9 F)
1974
37.2 C (99.0 F)
1975
39.4 C (102.9 F)
1976
40.0 C (104.0 F)
1977
40.0 C (104.0 F)
1978
40.6 C (105.1 F)
1979
36.7 C (98.1 F)
1980
38.9 C (102.0 F)
1981
17.8 C (64.0 F)
1999
31.7 C (89.1 F)
2000
37.8 C (100.0 F)
2001
39.4 C (102.9 F)
2002
38.9 C (102.0 F)
2003
36.1 C (97.0 F)
2004
34.4 C (93.9 F)
2005
36.7 C (98.1 F)
2006
37.8 C (100.0 F)
2007
40.6 C (105.1 F)
2008
35.6 C (96.1 F)
2009
36.7 C (98.1 F)
2010
35.0 C (95.0 F)
2011
33.3 C (91.9 F)
2012
39.4 C (102.9 F)
2013
35.6 C (96.1 F)
2014
32.8 C (91.0 F)
2015
37.2 C (99.0 F)
2016
35.6 C (96.1 F)
2017
38.3 C (100.9 F)
2018
40.6 C (105.1 F)
2019
32.2 C (90.0 F)
2020
35.0 C (95.0 F)
2021
39.4 C (102.9 F)
2022
37.8 C (100.0 F)
2023
35.6 C (96.1 F)
2024
37.2 C (99.0 F)
2025
36.7 C (98.1 F)
2026
n/a
Coldest night (TNn)
The coldest night of the year at Riverdale, 1948 to 2026. The record is -40.0 C (-40.0 F) in 1977, marked on the chart; the median year is -31.7 C (-25.1 F).
Coldest night (TNn) at Riverdale by year
Year
Coldest night (TNn)
1948
-28.3 C (-18.9 F)
1949
-34.4 C (-29.9 F)
1950
-31.7 C (-25.1 F)
1951
-37.2 C (-35.0 F)
1952
-31.1 C (-24.0 F)
1953
-29.4 C (-20.9 F)
1954
-35.6 C (-32.1 F)
1955
-32.8 C (-27.0 F)
1956
-29.4 C (-20.9 F)
1957
-35.0 C (-31.0 F)
1958
-31.1 C (-24.0 F)
1959
-36.7 C (-34.1 F)
1960
-30.0 C (-22.0 F)
1961
-32.2 C (-26.0 F)
1962
-35.6 C (-32.1 F)
1963
-32.2 C (-26.0 F)
1964
-31.1 C (-24.0 F)
1965
-31.7 C (-25.1 F)
1966
-37.2 C (-35.0 F)
1967
-37.2 C (-35.0 F)
1968
-36.7 C (-34.1 F)
1969
-31.7 C (-25.1 F)
1970
-36.1 C (-33.0 F)
1971
-33.9 C (-29.0 F)
1972
-36.1 C (-33.0 F)
1973
-30.6 C (-23.1 F)
1974
-36.7 C (-34.1 F)
1975
-29.4 C (-20.9 F)
1976
-38.3 C (-36.9 F)
1977
-40.0 C (-40.0 F)
1978
-33.3 C (-27.9 F)
1979
-37.2 C (-35.0 F)
1980
-33.9 C (-29.0 F)
1981
-30.0 C (-22.0 F)
1999
-23.9 C (-11.0 F)
2000
-32.2 C (-26.0 F)
2001
-30.0 C (-22.0 F)
2002
-32.2 C (-26.0 F)
2003
-30.0 C (-22.0 F)
2004
-37.2 C (-35.0 F)
2005
-23.3 C (-9.9 F)
2006
-30.6 C (-23.1 F)
2007
-29.4 C (-20.9 F)
2008
-30.6 C (-23.1 F)
2009
-35.0 C (-31.0 F)
2010
-32.8 C (-27.0 F)
2011
-30.6 C (-23.1 F)
2012
-27.2 C (-17.0 F)
2013
-30.6 C (-23.1 F)
2014
-30.0 C (-22.0 F)
2015
-30.0 C (-22.0 F)
2016
-26.1 C (-15.0 F)
2017
-31.1 C (-24.0 F)
2018
-30.6 C (-23.1 F)
2019
-32.8 C (-27.0 F)
2020
-29.4 C (-20.9 F)
2021
-31.7 C (-25.1 F)
2022
-31.7 C (-25.1 F)
2023
-28.3 C (-18.9 F)
2024
-32.2 C (-26.0 F)
2025
-33.9 C (-29.0 F)
2026
n/a
Wettest day (Rx1day)
The wettest day of the year at Riverdale, 1948 to 2026. The record is 105.4 mm (4.1 in) in 1966, marked on the chart; the median year is 40.6 mm (1.6 in).
Wettest day (Rx1day) at Riverdale by year
Year
Wettest day (Rx1day)
1948
17.3 mm (0.7 in)
1949
38.1 mm (1.5 in)
1950
39.1 mm (1.5 in)
1951
87.6 mm (3.4 in)
1952
54.6 mm (2.1 in)
1953
24.1 mm (0.9 in)
1954
40.1 mm (1.6 in)
1955
43.4 mm (1.7 in)
1956
62.2 mm (2.4 in)
1957
61.2 mm (2.4 in)
1958
27.4 mm (1.1 in)
1959
49.8 mm (2.0 in)
1960
45.2 mm (1.8 in)
1961
21.6 mm (0.9 in)
1962
35.6 mm (1.4 in)
1963
36.8 mm (1.4 in)
1964
55.9 mm (2.2 in)
1965
52.8 mm (2.1 in)
1966
105.4 mm (4.1 in)
1967
52.8 mm (2.1 in)
1968
62.2 mm (2.4 in)
1969
33.8 mm (1.3 in)
1970
53.3 mm (2.1 in)
1971
50.8 mm (2.0 in)
1972
38.1 mm (1.5 in)
1973
27.9 mm (1.1 in)
1974
27.9 mm (1.1 in)
1975
33.0 mm (1.3 in)
1976
47.0 mm (1.9 in)
1977
51.1 mm (2.0 in)
1978
84.1 mm (3.3 in)
1979
23.1 mm (0.9 in)
1980
45.2 mm (1.8 in)
1981
5.6 mm (0.22 in)
1999
29.7 mm (1.2 in)
2000
36.1 mm (1.4 in)
2001
34.5 mm (1.4 in)
2002
67.6 mm (2.7 in)
2003
35.6 mm (1.4 in)
2004
16.5 mm (0.6 in)
2005
45.7 mm (1.8 in)
2006
45.7 mm (1.8 in)
2007
55.9 mm (2.2 in)
2008
45.7 mm (1.8 in)
2009
23.1 mm (0.9 in)
2010
29.5 mm (1.2 in)
2011
45.7 mm (1.8 in)
2012
40.6 mm (1.6 in)
2013
76.2 mm (3.0 in)
2014
58.4 mm (2.3 in)
2015
47.8 mm (1.9 in)
2016
38.1 mm (1.5 in)
2017
0.0 mm (0.00 in)
2018
n/a
2019
3.8 mm (0.15 in)
2020
15.0 mm (0.6 in)
2021
44.5 mm (1.8 in)
2022
20.8 mm (0.8 in)
2023
24.6 mm (1.0 in)
2024
50.8 mm (2.0 in)
2025
50.0 mm (2.0 in)
2026
11.1 mm (0.4 in)
Wettest five days (Rx5day)
The wettest five days of the year at Riverdale, 1948 to 2026. The record is 123.4 mm (4.9 in) in 1957, marked on the chart; the median year is 57.5 mm (2.3 in).
Wettest five days (Rx5day) at Riverdale by year
Year
Wettest five days (Rx5day)
1948
18.3 mm (0.7 in)
1949
43.2 mm (1.7 in)
1950
49.0 mm (1.9 in)
1951
105.9 mm (4.2 in)
1952
82.3 mm (3.2 in)
1953
44.5 mm (1.8 in)
1954
60.4 mm (2.4 in)
1955
52.2 mm (2.1 in)
1956
78.2 mm (3.1 in)
1957
123.4 mm (4.9 in)
1958
93.7 mm (3.7 in)
1959
77.0 mm (3.0 in)
1960
79.5 mm (3.1 in)
1961
41.2 mm (1.6 in)
1962
66.0 mm (2.6 in)
1963
50.8 mm (2.0 in)
1964
91.4 mm (3.6 in)
1965
54.3 mm (2.1 in)
1966
122.4 mm (4.8 in)
1967
69.9 mm (2.8 in)
1968
77.9 mm (3.1 in)
1969
57.8 mm (2.3 in)
1970
93.9 mm (3.7 in)
1971
91.5 mm (3.6 in)
1972
57.2 mm (2.3 in)
1973
59.4 mm (2.3 in)
1974
32.9 mm (1.3 in)
1975
57.9 mm (2.3 in)
1976
56.4 mm (2.2 in)
1977
79.8 mm (3.1 in)
1978
107.3 mm (4.2 in)
1979
48.2 mm (1.9 in)
1980
56.6 mm (2.2 in)
1981
6.1 mm (0.24 in)
1999
63.5 mm (2.5 in)
2000
72.5 mm (2.9 in)
2001
47.3 mm (1.9 in)
2002
68.1 mm (2.7 in)
2003
2.3 mm (0.09 in)
2004
16.5 mm (0.6 in)
2005
68.6 mm (2.7 in)
2006
58.7 mm (2.3 in)
2007
71.4 mm (2.8 in)
2008
53.6 mm (2.1 in)
2009
42.9 mm (1.7 in)
2010
59.0 mm (2.3 in)
2011
n/a
2012
40.6 mm (1.6 in)
2013
76.2 mm (3.0 in)
2014
58.4 mm (2.3 in)
2015
19.3 mm (0.8 in)
2016
22.6 mm (0.9 in)
2017
0.0 mm (0.00 in)
2018
n/a
2019
5.5 mm (0.22 in)
2020
17.3 mm (0.7 in)
2021
45.8 mm (1.8 in)
2022
37.9 mm (1.5 in)
2023
26.1 mm (1.0 in)
2024
59.7 mm (2.4 in)
2025
50.0 mm (2.0 in)
2026
12.3 mm (0.5 in)
Longest dry spell (CDD)
The longest dry spell of the year at Riverdale, 1948 to 2026. The record is 82 days in 1961, marked on the chart; the median year is 35 days.
Longest dry spell (CDD) at Riverdale by year
Year
Longest dry spell (CDD)
1948
35 days
1949
33 days
1950
32 days
1951
32 days
1952
66 days
1953
26 days
1954
34 days
1955
22 days
1956
33 days
1957
45 days
1958
38 days
1959
35 days
1960
46 days
1961
82 days
1962
26 days
1963
46 days
1964
30 days
1965
42 days
1966
41 days
1967
49 days
1968
38 days
1969
57 days
1970
17 days
1971
36 days
1972
25 days
1973
42 days
1974
29 days
1975
39 days
1976
51 days
1977
42 days
1978
55 days
1979
47 days
1980
52 days
1981
24 days
1999
36 days
2000
38 days
2001
36 days
2002
26 days
2003
29 days
2004
25 days
2005
27 days
2006
56 days
2007
58 days
2008
35 days
2009
38 days
2010
38 days
2011
2 days
2012
34 days
2013
20 days
2014
31 days
2015
16 days
2016
12 days
2017
8 days
2018
n/a
2019
9 days
2020
20 days
2021
45 days
2022
25 days
2023
50 days
2024
40 days
2025
39 days
2026
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
33 years with a frost
Across 33 years with a frost, the median last spring frost at Riverdale falls on 14 May and the median first autumn frost on 26 September, which leaves a median of 133 days between them.
Fitted over all years, the growing season changes by +3.7 days per decade at this station.
Frost dates and growing season at Riverdale
Measure
Median, all years
Earliest period
Recent period (1954 to 2023)
Recent against earliest
Fitted trend
Last spring frost
14 May
n/a
15 May
n/a
-0.8 days per decade
First autumn frost
26 September
n/a
27 September
n/a
+2.9 days per decade
Growing days
133 days
n/a
133 days
n/a
+3.7 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
33 years, 1949 to 2024
A day with at least 43.5 mm (1.7 in) of rain is expected about once in 2 years. A day with at least 109.8 mm (4.3 in) of rain is expected about once in 100 years.
Rainfall return levels at Riverdale: the daily rain expected about once in a given number of years
Expected about once in
A day with at least
Note
2 years
43.5 mm (1.7 in)
5 years
60.0 mm (2.4 in)
10 years
71.4 mm (2.8 in)
25 years
86.4 mm (3.4 in)
50 years
97.9 mm (3.9 in)
Longer than the 33 years of record
100 years
109.8 mm (4.3 in)
Longer than the 33 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, 33 years of values from 1949 to 2024.
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: 105.4 mm (4.1 in) in 1966; 87.6 mm (3.4 in) in 1951; 84.1 mm (3.3 in) in 1978.
Download the Data
Data for Riverdale standing records by year: CSV or JSON. Field meanings are on the data page.
Data for Riverdale 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 2026-10-13 (13 October 2026). Records are computed by this site and are not official.