Record envelope, standing records and threshold days for Portal (USC00327201), North Dakota, United States, with 81 years of record.
Key Facts for Portal
Portal (USC00327201) is a weather station in North Dakota, United States at 49.00 latitude and -102.55 longitude, 595 m (1,952 ft) above sea level.
The station reports from 1893 to 1973, 81 years of record.
1,464 records set at Portal still stand.
Records are tracked for tmax, tmin, prcp, snow: an element needs 30 years of data to be eligible.
Portal set a daily record low maximum temperature of -12.8 C (9.0 F) on 9 November 1973.
About the Station
Location: North Dakota, United States, 49.00 latitude, -102.55 longitude.
Elevation: 595 m (1,952 ft).
Period of record: 1893 to 1973, 81 years.
Eligible elements: tmax, tmin, prcp, snow.
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 Portal. 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 Portal, with 2026 drawn through them
Month
Highest record high
Lowest record low
2026 highest maximum
2026 lowest minimum
Jan
11.7 C (53.1 F)
-42.8 C (-45.0 F)
n/a
n/a
Feb
17.2 C (63.0 F)
-45.6 C (-50.1 F)
n/a
n/a
Mar
24.4 C (75.9 F)
-41.1 C (-42.0 F)
n/a
n/a
Apr
33.3 C (91.9 F)
-25.6 C (-14.1 F)
n/a
n/a
May
38.3 C (100.9 F)
-11.1 C (12.0 F)
n/a
n/a
Jun
42.8 C (109.0 F)
-2.8 C (27.0 F)
n/a
n/a
Jul
42.8 C (109.0 F)
-1.1 C (30.0 F)
n/a
n/a
Aug
41.1 C (106.0 F)
-3.3 C (26.1 F)
n/a
n/a
Sep
40.0 C (104.0 F)
-12.8 C (9.0 F)
n/a
n/a
Oct
33.9 C (93.0 F)
-20.0 C (-4.0 F)
n/a
n/a
Nov
25.6 C (78.1 F)
-32.2 C (-26.0 F)
n/a
n/a
Dec
16.1 C (61.0 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 Portal still stand. 1936 holds the most, with 55.
Standing records at Portal by the year they were set
Year set
Standing records
1893
3
1894
53
1895
32
1896
43
1897
40
1898
22
1899
16
1900
23
1901
28
1902
11
1903
23
1904
16
1905
19
1906
25
1907
27
1908
16
1909
23
1929
19
1930
26
1931
53
1932
22
1933
19
1934
45
1935
21
1936
55
1937
22
1938
22
1939
44
1940
19
1941
17
1942
38
1943
23
1944
13
1945
24
1946
24
1947
17
1948
32
1949
22
1950
33
1951
25
1952
20
1953
21
1954
36
1955
16
1956
17
1957
17
1958
17
1959
17
1960
11
1961
21
1962
20
1963
27
1964
26
1965
21
1966
22
1967
15
1968
20
1969
19
1970
7
1971
14
1972
16
1973
9
All-Time Record Progression
1 new records
1 all-time records were set at Portal between 26 January 1950 and 26 January 1950. Each dot is a new record.
When Portal set new all-time records
Date
Kind
Detail
1950-01-26
Record low maximum temperature
Record low maximum temperature -35.6 C (-32.1 F)
Wettest Day of Each Month
Jun: 143.5 mm (5.6 in)
The wettest day on record for each calendar month at Portal. The most was 143.5 mm (5.6 in) on 5 June 1906.
Record daily precipitation for each month at Portal
Month
Record daily precipitation (mm)
Date
Jan
15.5 mm (0.6 in)
16 January 1967
Feb
20.3 mm (0.8 in)
5 February 1897
Mar
27.2 mm (1.1 in)
26 March 1945
Apr
39.4 mm (1.6 in)
29 April 1970
May
57.2 mm (2.3 in)
22 May 1903
Jun
143.5 mm (5.6 in)
5 June 1906
Jul
91.4 mm (3.6 in)
6 July 1895
Aug
96.5 mm (3.8 in)
27 August 1903
Sep
50.8 mm (2.0 in)
22 September 1945
Oct
50.8 mm (2.0 in)
21 October 1958
Nov
20.8 mm (0.8 in)
2 November 1938
Dec
20.3 mm (0.8 in)
28 December 1902
Period of Record Coverage
1893 to 1973
Complete yearUnder 90 percent of days
62 years of record at Portal, 1893 to 1973. 15 years have data for under 90 percent of days and are left out of rankings: 1893, 1899, 1901, 1902, 1904, 1905, 1907, 1908 and others.
Cooler than the station meanWarmer than the station mean
One stripe for each of 45 complete years at Portal, 1896 to 1971. Blue stripes are years cooler than the station's own mean of 3.2 C (37.7 F); red stripes are warmer. The coolest year was 1950, at 0.4 C (32.6 F), and the warmest was 1931, at 6.6 C (43.9 F). The strongest colour marks a difference of 3.5 C (6.3 F).
Annual mean temperature at Portal as warming stripes, 1896 to 1971
Year
Annual mean temperature
Difference from the station mean
1896
2.2 C
-1.02 C
1897
2.2 C
-1.01 C
1900
3.8 C
+0.65 C
1906
2.9 C
-0.29 C
1930
3.8 C
+0.66 C
1931
6.6 C
+3.45 C
1932
2.6 C
-0.54 C
1933
3.5 C
+0.30 C
1934
5.2 C
+2.05 C
1935
2.2 C
-0.97 C
1936
2.0 C
-1.18 C
1937
2.7 C
-0.52 C
1938
4.6 C
+1.47 C
1939
4.1 C
+0.97 C
1940
3.6 C
+0.45 C
1941
4.0 C
+0.84 C
1942
3.8 C
+0.66 C
1943
2.8 C
-0.37 C
1944
4.0 C
+0.87 C
1945
2.7 C
-0.46 C
1946
3.8 C
+0.59 C
1947
3.2 C
+0.06 C
1948
2.8 C
-0.36 C
1949
2.8 C
-0.34 C
1950
0.4 C
-2.82 C
1951
0.8 C
-2.36 C
1952
3.8 C
+0.61 C
1953
4.6 C
+1.44 C
1954
3.6 C
+0.41 C
1955
1.9 C
-1.30 C
1956
2.6 C
-0.57 C
1958
3.8 C
+0.66 C
1959
2.8 C
-0.34 C
1960
3.1 C
-0.08 C
1961
4.2 C
+1.04 C
1962
3.7 C
+0.52 C
1963
4.2 C
+1.07 C
1964
3.3 C
+0.09 C
1965
2.3 C
-0.87 C
1966
2.1 C
-1.06 C
1967
2.9 C
-0.23 C
1968
3.1 C
-0.05 C
1969
2.4 C
-0.73 C
1970
2.2 C
-0.94 C
1971
2.8 C
-0.34 C
The fitted trend in annual mean temperature here over 1896 to 1971 is -0.05 C (-0.23 to 0.13) per decade. The interval includes zero, so the trend is not clearly different from zero. In Fahrenheit: -0.1 F (-0.4 to 0.2) per decade. The slope is a straight line fitted to 45 complete years; the brackets give its 95 percent interval.
Fitted temperature trends per decade at Portal
Measure
Per decade (C)
Per decade (F)
Period
Complete years
Reading
Annual mean temperature
-0.05 C (-0.23 to 0.13) per decade
-0.1 F (-0.4 to 0.2) per decade
1896 to 1971
45
Not clearly different from zero
Mean daily maximum
-0.1 C (-0.4 to 0.1) per decade
-0.2 F (-0.7 to 0.2) per decade
1896 to 1971
45
Not clearly different from zero
Mean daily minimum
0.04 C (-0.11 to 0.19) per decade
0.1 F (-0.2 to 0.3) per decade
1896 to 1971
45
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
1893 to 1973
Yearly extremes at Portal: the record and the median year
Measure
Record
Year of the record
Median year
Years with a value
Hottest day (TXx)
42.8 C (109.0 F)
1897
37.2 C (99.0 F)
62
Coldest night (TNn)
-45.6 C (-50.1 F)
1936
-36.7 C (-34.1 F)
62
Wettest day (Rx1day)
143.5 mm (5.6 in)
1906
40.9 mm (1.6 in)
62
Wettest five days (Rx5day)
204.6 mm (8.1 in)
1944
57.4 mm (2.3 in)
61
Longest dry spell (CDD)
68 days
1960
36 days
62
Hottest day (TXx)
The hottest day of the year at Portal, 1893 to 1973. The record is 42.8 C (109.0 F) in 1897, marked on the chart; the median year is 37.2 C (99.0 F).
Hottest day (TXx) at Portal by year
Year
Hottest day (TXx)
1893
2.8 C (37.0 F)
1894
41.7 C (107.1 F)
1895
37.8 C (100.0 F)
1896
40.0 C (104.0 F)
1897
42.8 C (109.0 F)
1898
37.8 C (100.0 F)
1899
34.4 C (93.9 F)
1900
38.9 C (102.0 F)
1901
35.0 C (95.0 F)
1902
32.2 C (90.0 F)
1903
34.4 C (93.9 F)
1904
35.6 C (96.1 F)
1905
34.4 C (93.9 F)
1906
37.2 C (99.0 F)
1907
29.4 C (84.9 F)
1908
35.0 C (95.0 F)
1909
35.6 C (96.1 F)
1929
38.9 C (102.0 F)
1930
39.4 C (102.9 F)
1931
41.7 C (107.1 F)
1932
40.0 C (104.0 F)
1933
37.8 C (100.0 F)
1934
38.3 C (100.9 F)
1935
36.7 C (98.1 F)
1936
42.8 C (109.0 F)
1937
41.7 C (107.1 F)
1938
36.1 C (97.0 F)
1939
40.0 C (104.0 F)
1940
37.2 C (99.0 F)
1941
38.9 C (102.0 F)
1942
36.7 C (98.1 F)
1943
32.2 C (90.0 F)
1944
33.9 C (93.0 F)
1945
37.8 C (100.0 F)
1946
37.2 C (99.0 F)
1947
37.2 C (99.0 F)
1948
36.7 C (98.1 F)
1949
39.4 C (102.9 F)
1950
35.0 C (95.0 F)
1951
38.3 C (100.9 F)
1952
38.9 C (102.0 F)
1953
32.8 C (91.0 F)
1954
35.0 C (95.0 F)
1955
35.6 C (96.1 F)
1956
36.1 C (97.0 F)
1957
37.8 C (100.0 F)
1958
40.6 C (105.1 F)
1959
37.2 C (99.0 F)
1960
38.3 C (100.9 F)
1961
37.2 C (99.0 F)
1962
35.0 C (95.0 F)
1963
34.4 C (93.9 F)
1964
36.1 C (97.0 F)
1965
37.8 C (100.0 F)
1966
36.1 C (97.0 F)
1967
36.1 C (97.0 F)
1968
37.2 C (99.0 F)
1969
37.2 C (99.0 F)
1970
36.7 C (98.1 F)
1971
38.3 C (100.9 F)
1972
33.9 C (93.0 F)
1973
35.0 C (95.0 F)
Coldest night (TNn)
The coldest night of the year at Portal, 1893 to 1973. The record is -45.6 C (-50.1 F) in 1936, marked on the chart; the median year is -36.7 C (-34.1 F).
Coldest night (TNn) at Portal by year
Year
Coldest night (TNn)
1893
-37.8 C (-36.0 F)
1894
-40.0 C (-40.0 F)
1895
-38.9 C (-38.0 F)
1896
-35.0 C (-31.0 F)
1897
-41.1 C (-42.0 F)
1898
-31.7 C (-25.1 F)
1899
-42.8 C (-45.0 F)
1900
-36.1 C (-33.0 F)
1901
-36.1 C (-33.0 F)
1902
-36.1 C (-33.0 F)
1903
-40.6 C (-41.1 F)
1904
-38.3 C (-36.9 F)
1905
-40.0 C (-40.0 F)
1906
-35.6 C (-32.1 F)
1907
-41.7 C (-43.1 F)
1908
-31.7 C (-25.1 F)
1909
-39.4 C (-38.9 F)
1929
-36.1 C (-33.0 F)
1930
-35.6 C (-32.1 F)
1931
-29.4 C (-20.9 F)
1932
-35.6 C (-32.1 F)
1933
-40.0 C (-40.0 F)
1934
-38.9 C (-38.0 F)
1935
-40.0 C (-40.0 F)
1936
-45.6 C (-50.1 F)
1937
-38.3 C (-36.9 F)
1938
-37.8 C (-36.0 F)
1939
-41.7 C (-43.1 F)
1940
-35.0 C (-31.0 F)
1941
-33.9 C (-29.0 F)
1942
-35.6 C (-32.1 F)
1943
-40.0 C (-40.0 F)
1944
-37.8 C (-36.0 F)
1945
-35.6 C (-32.1 F)
1946
-35.6 C (-32.1 F)
1947
-37.8 C (-36.0 F)
1948
-35.6 C (-32.1 F)
1949
-42.8 C (-45.0 F)
1950
-39.4 C (-38.9 F)
1951
-37.8 C (-36.0 F)
1952
-34.4 C (-29.9 F)
1953
-35.0 C (-31.0 F)
1954
-41.1 C (-42.0 F)
1955
-35.6 C (-32.1 F)
1956
-36.7 C (-34.1 F)
1957
-33.9 C (-29.0 F)
1958
-33.9 C (-29.0 F)
1959
-34.4 C (-29.9 F)
1960
-35.0 C (-31.0 F)
1961
-36.7 C (-34.1 F)
1962
-38.3 C (-36.9 F)
1963
-35.0 C (-31.0 F)
1964
-32.8 C (-27.0 F)
1965
-36.1 C (-33.0 F)
1966
-39.4 C (-38.9 F)
1967
-36.1 C (-33.0 F)
1968
-37.2 C (-35.0 F)
1969
-37.2 C (-35.0 F)
1970
-36.7 C (-34.1 F)
1971
-36.7 C (-34.1 F)
1972
-39.4 C (-38.9 F)
1973
-31.1 C (-24.0 F)
Wettest day (Rx1day)
The wettest day of the year at Portal, 1893 to 1973. The record is 143.5 mm (5.6 in) in 1906, marked on the chart; the median year is 40.9 mm (1.6 in).
Wettest day (Rx1day) at Portal by year
Year
Wettest day (Rx1day)
1893
7.6 mm (0.30 in)
1894
50.8 mm (2.0 in)
1895
91.4 mm (3.6 in)
1896
41.1 mm (1.6 in)
1897
20.3 mm (0.8 in)
1898
38.1 mm (1.5 in)
1899
45.7 mm (1.8 in)
1900
50.8 mm (2.0 in)
1901
27.9 mm (1.1 in)
1902
51.3 mm (2.0 in)
1903
96.5 mm (3.8 in)
1904
41.1 mm (1.6 in)
1905
38.1 mm (1.5 in)
1906
143.5 mm (5.6 in)
1907
18.3 mm (0.7 in)
1908
17.3 mm (0.7 in)
1909
49.5 mm (1.9 in)
1929
50.8 mm (2.0 in)
1930
25.1 mm (1.0 in)
1931
41.9 mm (1.6 in)
1932
38.4 mm (1.5 in)
1933
27.9 mm (1.1 in)
1934
30.0 mm (1.2 in)
1935
24.1 mm (0.9 in)
1936
30.7 mm (1.2 in)
1937
41.1 mm (1.6 in)
1938
26.7 mm (1.1 in)
1939
19.1 mm (0.8 in)
1940
45.7 mm (1.8 in)
1941
36.1 mm (1.4 in)
1942
25.9 mm (1.0 in)
1943
34.0 mm (1.3 in)
1944
120.7 mm (4.8 in)
1945
50.8 mm (2.0 in)
1946
37.3 mm (1.5 in)
1947
52.3 mm (2.1 in)
1948
41.4 mm (1.6 in)
1949
46.7 mm (1.8 in)
1950
45.0 mm (1.8 in)
1951
91.2 mm (3.6 in)
1952
44.2 mm (1.7 in)
1953
41.4 mm (1.6 in)
1954
58.2 mm (2.3 in)
1955
25.1 mm (1.0 in)
1956
24.9 mm (1.0 in)
1957
22.1 mm (0.9 in)
1958
50.8 mm (2.0 in)
1959
28.4 mm (1.1 in)
1960
23.4 mm (0.9 in)
1961
25.7 mm (1.0 in)
1962
41.7 mm (1.6 in)
1963
55.9 mm (2.2 in)
1964
45.7 mm (1.8 in)
1965
30.5 mm (1.2 in)
1966
37.3 mm (1.5 in)
1967
21.6 mm (0.9 in)
1968
46.7 mm (1.8 in)
1969
33.5 mm (1.3 in)
1970
40.6 mm (1.6 in)
1971
50.8 mm (2.0 in)
1972
30.5 mm (1.2 in)
1973
53.3 mm (2.1 in)
Wettest five days (Rx5day)
The wettest five days of the year at Portal, 1893 to 1973. The record is 204.6 mm (8.1 in) in 1944, marked on the chart; the median year is 57.4 mm (2.3 in).
Wettest five days (Rx5day) at Portal by year
Year
Wettest five days (Rx5day)
1893
8.9 mm (0.35 in)
1894
68.1 mm (2.7 in)
1895
69.9 mm (2.8 in)
1896
63.4 mm (2.5 in)
1897
28.7 mm (1.1 in)
1898
55.9 mm (2.2 in)
1899
64.8 mm (2.6 in)
1900
66.0 mm (2.6 in)
1901
71.1 mm (2.8 in)
1902
64.8 mm (2.6 in)
1903
111.7 mm (4.4 in)
1904
53.0 mm (2.1 in)
1905
38.1 mm (1.5 in)
1906
174.2 mm (6.9 in)
1907
29.5 mm (1.2 in)
1908
38.6 mm (1.5 in)
1909
49.5 mm (1.9 in)
1929
91.9 mm (3.6 in)
1930
44.7 mm (1.8 in)
1931
n/a
1932
57.4 mm (2.3 in)
1933
68.3 mm (2.7 in)
1934
30.0 mm (1.2 in)
1935
49.8 mm (2.0 in)
1936
30.7 mm (1.2 in)
1937
47.0 mm (1.9 in)
1938
47.8 mm (1.9 in)
1939
36.0 mm (1.4 in)
1940
62.7 mm (2.5 in)
1941
43.0 mm (1.7 in)
1942
38.9 mm (1.5 in)
1943
64.5 mm (2.5 in)
1944
204.6 mm (8.1 in)
1945
52.3 mm (2.1 in)
1946
41.4 mm (1.6 in)
1947
124.5 mm (4.9 in)
1948
55.6 mm (2.2 in)
1949
50.5 mm (2.0 in)
1950
68.4 mm (2.7 in)
1951
93.0 mm (3.7 in)
1952
68.9 mm (2.7 in)
1953
94.2 mm (3.7 in)
1954
84.9 mm (3.3 in)
1955
38.8 mm (1.5 in)
1956
46.2 mm (1.8 in)
1957
37.4 mm (1.5 in)
1958
70.1 mm (2.8 in)
1959
65.5 mm (2.6 in)
1960
28.8 mm (1.1 in)
1961
29.7 mm (1.2 in)
1962
77.0 mm (3.0 in)
1963
99.9 mm (3.9 in)
1964
63.8 mm (2.5 in)
1965
53.9 mm (2.1 in)
1966
46.6 mm (1.8 in)
1967
36.8 mm (1.4 in)
1968
60.5 mm (2.4 in)
1969
78.5 mm (3.1 in)
1970
83.8 mm (3.3 in)
1971
69.6 mm (2.7 in)
1972
53.3 mm (2.1 in)
1973
59.7 mm (2.4 in)
Longest dry spell (CDD)
The longest dry spell of the year at Portal, 1893 to 1973. The record is 68 days in 1960, marked on the chart; the median year is 36 days.
Longest dry spell (CDD) at Portal by year
Year
Longest dry spell (CDD)
1893
17 days
1894
29 days
1895
27 days
1896
25 days
1897
41 days
1898
28 days
1899
55 days
1900
63 days
1901
36 days
1902
40 days
1903
36 days
1904
32 days
1905
32 days
1906
38 days
1907
49 days
1908
34 days
1909
50 days
1929
67 days
1930
42 days
1931
1 day
1932
49 days
1933
34 days
1934
61 days
1935
39 days
1936
47 days
1937
39 days
1938
32 days
1939
30 days
1940
30 days
1941
52 days
1942
40 days
1943
36 days
1944
34 days
1945
30 days
1946
21 days
1947
24 days
1948
36 days
1949
33 days
1950
19 days
1951
23 days
1952
45 days
1953
25 days
1954
41 days
1955
27 days
1956
27 days
1957
26 days
1958
48 days
1959
37 days
1960
68 days
1961
38 days
1962
42 days
1963
59 days
1964
29 days
1965
51 days
1966
61 days
1967
31 days
1968
33 days
1969
53 days
1970
25 days
1971
50 days
1972
26 days
1973
28 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
45 years with a frost
Across 45 years with a frost, the median last spring frost at Portal falls on 24 May and the median first autumn frost on 13 September, which leaves a median of 110 days between them.
Fitted over all years, the growing season changes by -0.8 days per decade at this station.
Frost dates and growing season at Portal
Measure
Median, all years
Earliest period
Recent period (1941 to 1971)
Recent against earliest
Fitted trend
Last spring frost
24 May
n/a
26 May
n/a
+1.5 days per decade
First autumn frost
13 September
n/a
12 September
n/a
+0.6 days per decade
Growing days
110 days
n/a
109 days
n/a
-0.8 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
42 years, 1897 to 1971
A day with at least 37.3 mm (1.5 in) of rain is expected about once in 2 years. A day with at least 152.3 mm (6.0 in) of rain is expected about once in 100 years.
Rainfall return levels at Portal: the daily rain expected about once in a given number of years
Expected about once in
A day with at least
Note
2 years
37.3 mm (1.5 in)
5 years
55.4 mm (2.2 in)
10 years
71.2 mm (2.8 in)
25 years
97.2 mm (3.8 in)
50 years
121.9 mm (4.8 in)
Longer than the 42 years of record
100 years
152.3 mm (6.0 in)
Longer than the 42 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, 42 years of values from 1897 to 1971.
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: 143.5 mm (5.6 in) in 1906; 120.7 mm (4.8 in) in 1944; 96.5 mm (3.8 in) in 1903.
Station Changes
No change in the annual mean temperature of this station was found against its neighbours.
Download the Data
Data for Portal standing records by year: CSV or JSON. Field meanings are on the data page.
Data for Portal 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.