Record envelope, standing records and threshold days for Mullen 21 NW (USC00255702), Nebraska, United States, with 59 years of record.
Key Facts for Mullen 21 NW
Mullen 21 NW (USC00255702) is a weather station in Nebraska, United States at 42.25 latitude and -101.34 longitude, 1,055 m (3,460 ft) above sea level.
The station reports from 1948 to 2006, 59 years of record.
1,464 records set at Mullen 21 NW still stand.
Records are tracked for tmax, tmin, prcp, snow, snwd: an element needs 30 years of data to be eligible.
Mullen 21 NW set a monthly record daily snowfall of 25.4 cm (10.0 in) on 21 December 2006.
About the Station
Location: Nebraska, United States, 42.25 latitude, -101.34 longitude.
Elevation: 1,055 m (3,460 ft).
Period of record: 1948 to 2006, 59 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 Mullen 21 NW. 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 Mullen 21 NW, with 2026 drawn through them
Month
Highest record high
Lowest record low
2026 highest maximum
2026 lowest minimum
Jan
21.1 C (70.0 F)
-35.6 C (-32.1 F)
n/a
n/a
Feb
24.4 C (75.9 F)
-35.6 C (-32.1 F)
n/a
n/a
Mar
28.9 C (84.0 F)
-27.2 C (-17.0 F)
n/a
n/a
Apr
35.6 C (96.1 F)
-19.4 C (-2.9 F)
n/a
n/a
May
36.1 C (97.0 F)
-11.1 C (12.0 F)
n/a
n/a
Jun
40.0 C (104.0 F)
-1.1 C (30.0 F)
n/a
n/a
Jul
43.3 C (109.9 F)
2.2 C (36.0 F)
n/a
n/a
Aug
42.8 C (109.0 F)
-1.1 C (30.0 F)
n/a
n/a
Sep
38.3 C (100.9 F)
-9.4 C (15.1 F)
n/a
n/a
Oct
35.0 C (95.0 F)
-18.9 C (-2.0 F)
n/a
n/a
Nov
30.0 C (86.0 F)
-27.8 C (-18.0 F)
n/a
n/a
Dec
23.9 C (75.0 F)
-36.7 C (-34.1 F)
n/a
n/a
Which Years Hold Standing Records
1,464 standing records
Year with most
1,464 records at Mullen 21 NW still stand. 1989 holds the most, with 53.
Standing records at Mullen 21 NW by the year they were set
Year set
Standing records
1952
6
1953
22
1954
30
1955
35
1956
34
1957
10
1958
27
1959
8
1960
20
1961
23
1962
42
1963
44
1964
32
1965
41
1966
38
1967
36
1968
42
1969
29
1970
20
1971
19
1972
27
1973
16
1974
23
1975
25
1976
31
1977
34
1978
9
1979
26
1981
17
1982
25
1983
36
1984
15
1985
43
1986
30
1987
22
1988
24
1989
53
1990
32
1991
29
1992
34
1993
29
1994
17
1995
26
1996
27
1997
33
1998
30
1999
28
2000
35
2001
26
2002
42
2003
18
2005
13
2006
31
All-Time Record Progression
7 new records
7 all-time records were set at Mullen 21 NW between 3 April 1984 and 17 July 2006. Each dot is a new record.
When Mullen 21 NW set new all-time records
Date
Kind
Detail
1984-04-03
Record daily snowfall
Record daily snowfall 40.6 cm (16.0 in)
1984-11-10
Record daily snowfall
Record daily snowfall 45.7 cm (18.0 in)
1989-02-04
Record low maximum temperature
Record low maximum temperature -26.1 C (-15.0 F)
1989-12-22
Record low minimum temperature
Record low minimum temperature -36.7 C (-34.1 F)
2001-07-27
Record daily precipitation
Record daily precipitation 150.6 mm (5.9 in)
2006-07-16
Record high minimum temperature
Record high minimum temperature 24.4 C (75.9 F)
2006-07-17
Record high maximum temperature
Record high maximum temperature 43.3 C (109.9 F)
Wettest Day of Each Month
Jul: 150.6 mm (5.9 in)
The wettest day on record for each calendar month at Mullen 21 NW. The most was 150.6 mm (5.9 in) on 27 July 2001.
Record daily precipitation for each month at Mullen 21 NW
Month
Record daily precipitation (mm)
Date
Jan
31.8 mm (1.3 in)
19 January 1988
Feb
29.2 mm (1.1 in)
19 February 1971
Mar
48.3 mm (1.9 in)
30 March 1949
Apr
70.9 mm (2.8 in)
20 April 1971
May
128.3 mm (5.1 in)
26 May 1955
Jun
104.1 mm (4.1 in)
10 June 1986
Jul
150.6 mm (5.9 in)
27 July 2001
Aug
100.6 mm (4.0 in)
8 August 1968
Sep
99.8 mm (3.9 in)
30 September 1995
Oct
63.8 mm (2.5 in)
29 October 2000
Nov
50.8 mm (2.0 in)
5 November 1979
Dec
33.0 mm (1.3 in)
23 December 1948
Period of Record Coverage
1952 to 2006
Complete yearUnder 90 percent of days
53 years of record at Mullen 21 NW, 1952 to 2006. 16 years have data for under 90 percent of days and are left out of rankings: 1952, 1953, 1955, 1958, 1959, 1960, 1972, 1973 and others.
Cooler than the station meanWarmer than the station mean
One stripe for each of 33 complete years at Mullen 21 NW, 1956 to 2002. Blue stripes are years cooler than the station's own mean of 8.2 C (46.8 F); red stripes are warmer. The coolest year was 1993, at 7.0 C (44.6 F), and the warmest was 1999, at 9.9 C (49.8 F). The strongest colour marks a difference of 1.7 C (3.1 F).
Annual mean temperature at Mullen 21 NW as warming stripes, 1956 to 2002
Year
Annual mean temperature
Difference from the station mean
1956
8.9 C
+0.68 C
1961
8.3 C
+0.10 C
1962
8.1 C
-0.08 C
1963
9.0 C
+0.75 C
1964
7.9 C
-0.29 C
1965
7.5 C
-0.68 C
1966
7.2 C
-1.05 C
1967
7.8 C
-0.46 C
1968
7.7 C
-0.55 C
1969
7.1 C
-1.13 C
1970
7.5 C
-0.76 C
1971
7.5 C
-0.74 C
1974
8.1 C
-0.14 C
1975
7.5 C
-0.73 C
1976
8.5 C
+0.30 C
1982
7.0 C
-1.17 C
1985
7.0 C
-1.20 C
1986
8.9 C
+0.68 C
1988
8.4 C
+0.14 C
1989
8.0 C
-0.21 C
1990
9.0 C
+0.80 C
1991
9.1 C
+0.86 C
1992
8.6 C
+0.42 C
1993
7.0 C
-1.23 C
1994
8.8 C
+0.61 C
1995
8.3 C
+0.13 C
1996
7.1 C
-1.07 C
1997
8.5 C
+0.29 C
1998
9.4 C
+1.23 C
1999
9.9 C
+1.68 C
2000
9.1 C
+0.91 C
2001
9.3 C
+1.11 C
2002
8.9 C
+0.73 C
The annual mean temperature here has risen by 0.23 C (0.05 to 0.42) per decade over 1956 to 2002. In Fahrenheit: 0.4 F (0.1 to 0.8) 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 Mullen 21 NW
Measure
Per decade (C)
Per decade (F)
Period
Complete years
Reading
Annual mean temperature
0.23 C (0.05 to 0.42) per decade
0.4 F (0.1 to 0.8) per decade
1956 to 2002
33
Rise
Mean daily maximum
0.2 C (-0.1 to 0.4) per decade
0.3 F (-0.1 to 0.7) per decade
1956 to 2002
33
Not clearly different from zero
Mean daily minimum
0.3 C (0.1 to 0.5) per decade
0.5 F (0.2 to 0.9) per decade
1956 to 2002
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 2006
Yearly extremes at Mullen 21 NW: the record and the median year
Measure
Record
Year of the record
Median year
Years with a value
Hottest day (TXx)
43.3 C (109.9 F)
2006
38.9 C (102.0 F)
53
Coldest night (TNn)
-36.7 C (-34.1 F)
1989
-28.3 C (-18.9 F)
53
Wettest day (Rx1day)
150.6 mm (5.9 in)
2001
46.5 mm (1.8 in)
57
Wettest five days (Rx5day)
170.2 mm (6.7 in)
2001
74.5 mm (2.9 in)
57
Longest dry spell (CDD)
61 days
1949
29 days
57
Hottest day (TXx)
The hottest day of the year at Mullen 21 NW, 1948 to 2006. The record is 43.3 C (109.9 F) in 2006, marked on the chart; the median year is 38.9 C (102.0 F).
Hottest day (TXx) at Mullen 21 NW by year
Year
Hottest day (TXx)
1948
n/a
1949
n/a
1950
n/a
1951
n/a
1952
27.8 C (82.0 F)
1953
38.3 C (100.9 F)
1954
42.8 C (109.0 F)
1955
40.0 C (104.0 F)
1956
40.6 C (105.1 F)
1957
39.4 C (102.9 F)
1958
36.7 C (98.1 F)
1959
38.9 C (102.0 F)
1960
38.9 C (102.0 F)
1961
38.9 C (102.0 F)
1962
37.8 C (100.0 F)
1963
38.3 C (100.9 F)
1964
40.6 C (105.1 F)
1965
37.8 C (100.0 F)
1966
39.4 C (102.9 F)
1967
37.2 C (99.0 F)
1968
39.4 C (102.9 F)
1969
36.7 C (98.1 F)
1970
37.8 C (100.0 F)
1971
38.9 C (102.0 F)
1972
35.6 C (96.1 F)
1973
41.1 C (106.0 F)
1974
38.9 C (102.0 F)
1975
38.3 C (100.9 F)
1976
40.0 C (104.0 F)
1977
40.0 C (104.0 F)
1978
37.2 C (99.0 F)
1979
37.8 C (100.0 F)
1981
41.1 C (106.0 F)
1982
38.3 C (100.9 F)
1983
37.2 C (99.0 F)
1984
37.8 C (100.0 F)
1985
40.0 C (104.0 F)
1986
37.8 C (100.0 F)
1987
38.9 C (102.0 F)
1988
38.9 C (102.0 F)
1989
40.0 C (104.0 F)
1990
40.6 C (105.1 F)
1991
37.8 C (100.0 F)
1992
35.0 C (95.0 F)
1993
36.7 C (98.1 F)
1994
36.1 C (97.0 F)
1995
40.6 C (105.1 F)
1996
37.8 C (100.0 F)
1997
38.3 C (100.9 F)
1998
38.9 C (102.0 F)
1999
38.3 C (100.9 F)
2000
38.9 C (102.0 F)
2001
38.3 C (100.9 F)
2002
42.2 C (108.0 F)
2003
41.7 C (107.1 F)
2005
41.7 C (107.1 F)
2006
43.3 C (109.9 F)
Coldest night (TNn)
The coldest night of the year at Mullen 21 NW, 1948 to 2006. The record is -36.7 C (-34.1 F) in 1989, marked on the chart; the median year is -28.3 C (-18.9 F).
Coldest night (TNn) at Mullen 21 NW by year
Year
Coldest night (TNn)
1948
n/a
1949
n/a
1950
n/a
1951
n/a
1952
-21.1 C (-6.0 F)
1953
-21.7 C (-7.1 F)
1954
-27.2 C (-17.0 F)
1955
-27.2 C (-17.0 F)
1956
-23.3 C (-9.9 F)
1957
-28.3 C (-18.9 F)
1958
-23.9 C (-11.0 F)
1959
2.8 C (37.0 F)
1960
-27.2 C (-17.0 F)
1961
-23.9 C (-11.0 F)
1962
-30.0 C (-22.0 F)
1963
-33.9 C (-29.0 F)
1964
-31.1 C (-24.0 F)
1965
-25.6 C (-14.1 F)
1966
-31.7 C (-25.1 F)
1967
-30.6 C (-23.1 F)
1968
-31.1 C (-24.0 F)
1969
-28.3 C (-18.9 F)
1970
-27.8 C (-18.0 F)
1971
-28.3 C (-18.9 F)
1972
-30.0 C (-22.0 F)
1973
-29.4 C (-20.9 F)
1974
-30.0 C (-22.0 F)
1975
-31.7 C (-25.1 F)
1976
-28.3 C (-18.9 F)
1977
-29.4 C (-20.9 F)
1978
-26.7 C (-16.1 F)
1979
-31.7 C (-25.1 F)
1981
-18.9 C (-2.0 F)
1982
-31.1 C (-24.0 F)
1983
-34.4 C (-29.9 F)
1984
-29.4 C (-20.9 F)
1985
-35.6 C (-32.1 F)
1986
-26.7 C (-16.1 F)
1987
-21.1 C (-6.0 F)
1988
-32.2 C (-26.0 F)
1989
-36.7 C (-34.1 F)
1990
-33.3 C (-27.9 F)
1991
-23.9 C (-11.0 F)
1992
-23.9 C (-11.0 F)
1993
-28.9 C (-20.0 F)
1994
-29.4 C (-20.9 F)
1995
-26.1 C (-15.0 F)
1996
-33.9 C (-29.0 F)
1997
-26.7 C (-16.1 F)
1998
-28.9 C (-20.0 F)
1999
-22.8 C (-9.0 F)
2000
-26.7 C (-16.1 F)
2001
-22.8 C (-9.0 F)
2002
-23.3 C (-9.9 F)
2003
-28.9 C (-20.0 F)
2005
-6.7 C (19.9 F)
2006
-25.0 C (-13.0 F)
Wettest day (Rx1day)
The wettest day of the year at Mullen 21 NW, 1948 to 2006. The record is 150.6 mm (5.9 in) in 2001, marked on the chart; the median year is 46.5 mm (1.8 in).
Wettest day (Rx1day) at Mullen 21 NW by year
Year
Wettest day (Rx1day)
1948
33.3 mm (1.3 in)
1949
64.5 mm (2.5 in)
1950
71.1 mm (2.8 in)
1951
50.3 mm (2.0 in)
1952
39.6 mm (1.6 in)
1953
44.5 mm (1.8 in)
1954
43.2 mm (1.7 in)
1955
128.3 mm (5.1 in)
1956
30.0 mm (1.2 in)
1957
60.2 mm (2.4 in)
1958
25.4 mm (1.0 in)
1959
38.1 mm (1.5 in)
1960
40.4 mm (1.6 in)
1961
32.3 mm (1.3 in)
1962
37.6 mm (1.5 in)
1963
41.7 mm (1.6 in)
1964
39.1 mm (1.5 in)
1965
40.1 mm (1.6 in)
1966
61.5 mm (2.4 in)
1967
68.8 mm (2.7 in)
1968
100.6 mm (4.0 in)
1969
48.5 mm (1.9 in)
1970
48.8 mm (1.9 in)
1971
70.9 mm (2.8 in)
1972
40.1 mm (1.6 in)
1973
41.9 mm (1.6 in)
1974
78.0 mm (3.1 in)
1975
40.6 mm (1.6 in)
1976
41.4 mm (1.6 in)
1977
50.8 mm (2.0 in)
1978
47.2 mm (1.9 in)
1979
64.3 mm (2.5 in)
1981
46.5 mm (1.8 in)
1982
46.0 mm (1.8 in)
1983
49.3 mm (1.9 in)
1984
53.8 mm (2.1 in)
1985
29.2 mm (1.1 in)
1986
104.1 mm (4.1 in)
1987
38.9 mm (1.5 in)
1988
50.3 mm (2.0 in)
1989
23.1 mm (0.9 in)
1990
39.4 mm (1.6 in)
1991
54.9 mm (2.2 in)
1992
49.3 mm (1.9 in)
1993
47.0 mm (1.9 in)
1994
90.2 mm (3.6 in)
1995
99.8 mm (3.9 in)
1996
36.3 mm (1.4 in)
1997
60.7 mm (2.4 in)
1998
55.4 mm (2.2 in)
1999
39.9 mm (1.6 in)
2000
63.8 mm (2.5 in)
2001
150.6 mm (5.9 in)
2002
37.8 mm (1.5 in)
2003
26.2 mm (1.0 in)
2005
32.3 mm (1.3 in)
2006
46.5 mm (1.8 in)
Wettest five days (Rx5day)
The wettest five days of the year at Mullen 21 NW, 1948 to 2006. The record is 170.2 mm (6.7 in) in 2001, marked on the chart; the median year is 74.5 mm (2.9 in).
Wettest five days (Rx5day) at Mullen 21 NW by year
Year
Wettest five days (Rx5day)
1948
58.9 mm (2.3 in)
1949
97.0 mm (3.8 in)
1950
92.7 mm (3.6 in)
1951
92.7 mm (3.6 in)
1952
49.1 mm (1.9 in)
1953
76.2 mm (3.0 in)
1954
68.7 mm (2.7 in)
1955
163.1 mm (6.4 in)
1956
60.0 mm (2.4 in)
1957
108.9 mm (4.3 in)
1958
61.2 mm (2.4 in)
1959
61.5 mm (2.4 in)
1960
58.2 mm (2.3 in)
1961
66.8 mm (2.6 in)
1962
100.1 mm (3.9 in)
1963
88.4 mm (3.5 in)
1964
48.5 mm (1.9 in)
1965
52.3 mm (2.1 in)
1966
120.4 mm (4.7 in)
1967
101.3 mm (4.0 in)
1968
128.8 mm (5.1 in)
1969
91.5 mm (3.6 in)
1970
67.5 mm (2.7 in)
1971
74.0 mm (2.9 in)
1972
58.7 mm (2.3 in)
1973
95.2 mm (3.7 in)
1974
86.6 mm (3.4 in)
1975
65.0 mm (2.6 in)
1976
48.3 mm (1.9 in)
1977
50.8 mm (2.0 in)
1978
77.7 mm (3.1 in)
1979
77.8 mm (3.1 in)
1981
126.6 mm (5.0 in)
1982
79.1 mm (3.1 in)
1983
74.5 mm (2.9 in)
1984
77.2 mm (3.0 in)
1985
32.2 mm (1.3 in)
1986
160.8 mm (6.3 in)
1987
64.6 mm (2.5 in)
1988
119.2 mm (4.7 in)
1989
37.3 mm (1.5 in)
1990
52.3 mm (2.1 in)
1991
74.5 mm (2.9 in)
1992
64.4 mm (2.5 in)
1993
54.0 mm (2.1 in)
1994
96.6 mm (3.8 in)
1995
99.8 mm (3.9 in)
1996
60.2 mm (2.4 in)
1997
90.5 mm (3.6 in)
1998
74.6 mm (2.9 in)
1999
52.0 mm (2.0 in)
2000
76.5 mm (3.0 in)
2001
170.2 mm (6.7 in)
2002
44.2 mm (1.7 in)
2003
68.0 mm (2.7 in)
2005
76.1 mm (3.0 in)
2006
19.1 mm (0.8 in)
Longest dry spell (CDD)
The longest dry spell of the year at Mullen 21 NW, 1948 to 2006. The record is 61 days in 1949, marked on the chart; the median year is 29 days.
Longest dry spell (CDD) at Mullen 21 NW by year
Year
Longest dry spell (CDD)
1948
26 days
1949
61 days
1950
35 days
1951
33 days
1952
33 days
1953
32 days
1954
32 days
1955
42 days
1956
41 days
1957
41 days
1958
56 days
1959
15 days
1960
28 days
1961
37 days
1962
31 days
1963
26 days
1964
52 days
1965
36 days
1966
30 days
1967
27 days
1968
25 days
1969
19 days
1970
32 days
1971
25 days
1972
47 days
1973
26 days
1974
40 days
1975
26 days
1976
49 days
1977
29 days
1978
32 days
1979
35 days
1981
17 days
1982
26 days
1983
19 days
1984
27 days
1985
26 days
1986
32 days
1987
29 days
1988
29 days
1989
21 days
1990
20 days
1991
31 days
1992
31 days
1993
22 days
1994
18 days
1995
16 days
1996
31 days
1997
25 days
1998
51 days
1999
34 days
2000
20 days
2001
37 days
2002
26 days
2003
12 days
2005
24 days
2006
12 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 Mullen 21 NW falls on 18 May and the median first autumn frost on 20 September, which leaves a median of 125 days between them.
Fitted over all years, the growing season changes by +4.9 days per decade at this station.
Frost dates and growing season at Mullen 21 NW
Measure
Median, all years
Earliest period
Recent period (1963 to 2002)
Recent against earliest
Fitted trend
Last spring frost
18 May
n/a
19 May
n/a
-1.8 days per decade
First autumn frost
20 September
n/a
23 September
n/a
+3.1 days per decade
Growing days
125 days
n/a
129 days
n/a
+4.9 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
40 years, 1949 to 2002
A day with at least 49.7 mm (2.0 in) of rain is expected about once in 2 years. A day with at least 176.4 mm (6.9 in) of rain is expected about once in 100 years.
Rainfall return levels at Mullen 21 NW: the daily rain expected about once in a given number of years
Expected about once in
A day with at least
Note
2 years
49.7 mm (2.0 in)
5 years
71.5 mm (2.8 in)
10 years
89.8 mm (3.5 in)
25 years
118.6 mm (4.7 in)
50 years
145.0 mm (5.7 in)
Longer than the 40 years of record
100 years
176.4 mm (6.9 in)
Longer than the 40 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, 40 years of values from 1949 to 2002.
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: 150.6 mm (5.9 in) in 2001; 128.3 mm (5.1 in) in 1955; 104.1 mm (4.1 in) in 1986.
Download the Data
Data for Mullen 21 NW standing records by year: CSV or JSON. Field meanings are on the data page.
Data for Mullen 21 NW 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.