Record envelope, standing records and threshold days for Roland West Portal (USC00107858), Idaho, United States, with 33 years of record.
Key Facts for Roland West Portal
Roland West Portal (USC00107858) is a weather station in Idaho, United States at 47.35 latitude and -115.67 longitude, 1,266 m (4,154 ft) above sea level.
The station reports from 1921 to 1953, 33 years of record.
1,464 records set at Roland West Portal still stand.
Records are tracked for tmax, tmin, prcp, snow: an element needs 30 years of data to be eligible.
Roland West Portal set a daily record low minimum temperature of 2.2 C (36.0 F) on 24 July 1953.
About the Station
Location: Idaho, United States, 47.35 latitude, -115.67 longitude.
Elevation: 1,266 m (4,154 ft).
Period of record: 1921 to 1953, 33 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 Roland West 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 Roland West Portal, with 2026 drawn through them
Month
Highest record high
Lowest record low
2026 highest maximum
2026 lowest minimum
Jan
12.2 C (54.0 F)
-30.0 C (-22.0 F)
n/a
n/a
Feb
12.8 C (55.0 F)
-31.1 C (-24.0 F)
n/a
n/a
Mar
17.8 C (64.0 F)
-23.3 C (-9.9 F)
n/a
n/a
Apr
26.7 C (80.1 F)
-16.7 C (1.9 F)
n/a
n/a
May
32.8 C (91.0 F)
-7.8 C (18.0 F)
n/a
n/a
Jun
33.3 C (91.9 F)
-2.2 C (28.0 F)
n/a
n/a
Jul
35.6 C (96.1 F)
0.0 C (32.0 F)
n/a
n/a
Aug
35.0 C (95.0 F)
-2.2 C (28.0 F)
n/a
n/a
Sep
35.0 C (95.0 F)
-14.4 C (6.1 F)
n/a
n/a
Oct
29.4 C (84.9 F)
-17.2 C (1.0 F)
n/a
n/a
Nov
18.9 C (66.0 F)
-20.0 C (-4.0 F)
n/a
n/a
Dec
16.1 C (61.0 F)
-32.8 C (-27.0 F)
n/a
n/a
Which Years Hold Standing Records
1,464 standing records
Year with most
1,464 records at Roland West Portal still stand. 1934 holds the most, with 90.
Standing records at Roland West Portal by the year they were set
Year set
Standing records
1921
38
1922
62
1923
39
1924
77
1925
40
1926
62
1927
35
1928
47
1929
40
1930
62
1931
50
1932
49
1933
49
1934
90
1935
50
1936
73
1937
55
1938
36
1939
52
1940
39
1941
33
1942
38
1943
44
1944
43
1945
37
1946
27
1947
19
1948
28
1949
39
1950
39
1951
31
1952
22
1953
19
Wettest Day of Each Month
Dec: 102.4 mm (4.0 in)
The wettest day on record for each calendar month at Roland West Portal. The most was 102.4 mm (4.0 in) on 6 December 1933.
Record daily precipitation for each month at Roland West Portal
Month
Record daily precipitation (mm)
Date
Jan
68.3 mm (2.7 in)
22 January 1935
Feb
68.1 mm (2.7 in)
16 February 1949
Mar
59.4 mm (2.3 in)
31 March 1943
Apr
50.3 mm (2.0 in)
18 April 1938
May
37.1 mm (1.5 in)
17 May 1941
Jun
58.7 mm (2.3 in)
8 June 1933
Jul
58.9 mm (2.3 in)
1 July 1926
Aug
41.9 mm (1.6 in)
20 August 1923
Sep
61.5 mm (2.4 in)
22 September 1926
Oct
50.8 mm (2.0 in)
21 October 1947
Nov
73.2 mm (2.9 in)
18 November 1946
Dec
102.4 mm (4.0 in)
6 December 1933
Period of Record Coverage
1921 to 1953
Complete yearUnder 90 percent of days
33 years of record at Roland West Portal, 1921 to 1953. 5 years have data for under 90 percent of days and are left out of rankings: 1921, 1947, 1948, 1950, 1953.
Cooler than the station meanWarmer than the station mean
One stripe for each of 27 complete years at Roland West Portal, 1922 to 1952. Blue stripes are years cooler than the station's own mean of 5.7 C (42.2 F); red stripes are warmer. The coolest year was 1932, at 4.9 C (40.7 F), and the warmest was 1934, at 8.1 C (46.5 F). The strongest colour marks a difference of 2.4 C (4.3 F).
Annual mean temperature at Roland West Portal as warming stripes, 1922 to 1952
Year
Annual mean temperature
Difference from the station mean
1922
4.9 C
-0.82 C
1923
5.3 C
-0.41 C
1924
5.0 C
-0.69 C
1925
6.3 C
+0.61 C
1926
6.4 C
+0.66 C
1928
5.9 C
+0.23 C
1929
5.1 C
-0.61 C
1930
5.5 C
-0.18 C
1931
6.2 C
+0.50 C
1932
4.9 C
-0.83 C
1933
5.4 C
-0.28 C
1934
8.1 C
+2.37 C
1935
5.5 C
-0.21 C
1936
6.1 C
+0.39 C
1937
5.2 C
-0.53 C
1938
5.9 C
+0.25 C
1939
6.3 C
+0.57 C
1940
6.7 C
+1.03 C
1941
6.5 C
+0.82 C
1942
5.7 C
+0.00 C
1943
5.1 C
-0.63 C
1944
5.9 C
+0.16 C
1945
5.1 C
-0.64 C
1946
5.3 C
-0.37 C
1949
4.9 C
-0.83 C
1951
5.0 C
-0.71 C
1952
5.8 C
+0.11 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
1921 to 1953
Yearly extremes at Roland West Portal: the record and the median year
Measure
Record
Year of the record
Median year
Years with a value
Hottest day (TXx)
35.6 C (96.1 F)
1924
33.3 C (91.9 F)
33
Coldest night (TNn)
-32.8 C (-27.0 F)
1924
-24.4 C (-11.9 F)
33
Wettest day (Rx1day)
102.4 mm (4.0 in)
1933
50.3 mm (2.0 in)
33
Wettest five days (Rx5day)
263.2 mm (10.4 in)
1933
113.8 mm (4.5 in)
33
Longest dry spell (CDD)
67 days
1929
28 days
33
Hottest day (TXx)
The hottest day of the year at Roland West Portal, 1921 to 1953. The record is 35.6 C (96.1 F) in 1924, marked on the chart; the median year is 33.3 C (91.9 F).
Hottest day (TXx) at Roland West Portal by year
Year
Hottest day (TXx)
1921
30.6 C (87.1 F)
1922
35.0 C (95.0 F)
1923
32.2 C (90.0 F)
1924
35.6 C (96.1 F)
1925
32.8 C (91.0 F)
1926
32.8 C (91.0 F)
1927
32.2 C (90.0 F)
1928
35.6 C (96.1 F)
1929
33.9 C (93.0 F)
1930
33.3 C (91.9 F)
1931
35.6 C (96.1 F)
1932
33.9 C (93.0 F)
1933
32.8 C (91.0 F)
1934
35.6 C (96.1 F)
1935
33.9 C (93.0 F)
1936
33.3 C (91.9 F)
1937
32.2 C (90.0 F)
1938
33.3 C (91.9 F)
1939
35.0 C (95.0 F)
1940
35.6 C (96.1 F)
1941
33.9 C (93.0 F)
1942
32.2 C (90.0 F)
1943
30.6 C (87.1 F)
1944
30.6 C (87.1 F)
1945
31.1 C (88.0 F)
1946
32.8 C (91.0 F)
1947
31.7 C (89.1 F)
1948
29.4 C (84.9 F)
1949
32.2 C (90.0 F)
1950
35.0 C (95.0 F)
1951
35.0 C (95.0 F)
1952
33.3 C (91.9 F)
1953
35.6 C (96.1 F)
Coldest night (TNn)
The coldest night of the year at Roland West Portal, 1921 to 1953. The record is -32.8 C (-27.0 F) in 1924, marked on the chart; the median year is -24.4 C (-11.9 F).
Coldest night (TNn) at Roland West Portal by year
Year
Coldest night (TNn)
1921
-22.2 C (-8.0 F)
1922
-26.1 C (-15.0 F)
1923
-26.7 C (-16.1 F)
1924
-32.8 C (-27.0 F)
1925
-13.9 C (7.0 F)
1926
-23.3 C (-9.9 F)
1927
-27.8 C (-18.0 F)
1928
-23.3 C (-9.9 F)
1929
-26.1 C (-15.0 F)
1930
-27.8 C (-18.0 F)
1931
-19.4 C (-2.9 F)
1932
-25.0 C (-13.0 F)
1933
-31.1 C (-24.0 F)
1934
-12.2 C (10.0 F)
1935
-27.8 C (-18.0 F)
1936
-29.4 C (-20.9 F)
1937
-30.0 C (-22.0 F)
1938
-20.0 C (-4.0 F)
1939
-24.4 C (-11.9 F)
1940
-19.4 C (-2.9 F)
1941
-20.6 C (-5.1 F)
1942
-25.6 C (-14.1 F)
1943
-30.0 C (-22.0 F)
1944
-20.0 C (-4.0 F)
1945
-22.2 C (-8.0 F)
1946
-17.8 C (0.0 F)
1947
-18.3 C (-0.9 F)
1948
-21.1 C (-6.0 F)
1949
-23.3 C (-9.9 F)
1950
-27.2 C (-17.0 F)
1951
-25.0 C (-13.0 F)
1952
-24.4 C (-11.9 F)
1953
-15.6 C (3.9 F)
Wettest day (Rx1day)
The wettest day of the year at Roland West Portal, 1921 to 1953. The record is 102.4 mm (4.0 in) in 1933, marked on the chart; the median year is 50.3 mm (2.0 in).
Wettest day (Rx1day) at Roland West Portal by year
Year
Wettest day (Rx1day)
1921
68.8 mm (2.7 in)
1922
37.3 mm (1.5 in)
1923
53.3 mm (2.1 in)
1924
58.4 mm (2.3 in)
1925
35.6 mm (1.4 in)
1926
61.5 mm (2.4 in)
1927
63.5 mm (2.5 in)
1928
36.3 mm (1.4 in)
1929
47.0 mm (1.9 in)
1930
51.8 mm (2.0 in)
1931
33.0 mm (1.3 in)
1932
48.0 mm (1.9 in)
1933
102.4 mm (4.0 in)
1934
56.6 mm (2.2 in)
1935
68.3 mm (2.7 in)
1936
51.6 mm (2.0 in)
1937
50.3 mm (2.0 in)
1938
50.3 mm (2.0 in)
1939
45.7 mm (1.8 in)
1940
46.0 mm (1.8 in)
1941
48.5 mm (1.9 in)
1942
66.0 mm (2.6 in)
1943
59.4 mm (2.3 in)
1944
28.4 mm (1.1 in)
1945
52.8 mm (2.1 in)
1946
73.2 mm (2.9 in)
1947
53.3 mm (2.1 in)
1948
40.1 mm (1.6 in)
1949
68.1 mm (2.7 in)
1950
47.2 mm (1.9 in)
1951
50.0 mm (2.0 in)
1952
35.6 mm (1.4 in)
1953
35.6 mm (1.4 in)
Wettest five days (Rx5day)
The wettest five days of the year at Roland West Portal, 1921 to 1953. The record is 263.2 mm (10.4 in) in 1933, marked on the chart; the median year is 113.8 mm (4.5 in).
Wettest five days (Rx5day) at Roland West Portal by year
Year
Wettest five days (Rx5day)
1921
130.8 mm (5.1 in)
1922
63.0 mm (2.5 in)
1923
110.9 mm (4.4 in)
1924
88.6 mm (3.5 in)
1925
110.3 mm (4.3 in)
1926
85.1 mm (3.4 in)
1927
132.8 mm (5.2 in)
1928
91.7 mm (3.6 in)
1929
130.3 mm (5.1 in)
1930
88.5 mm (3.5 in)
1931
85.1 mm (3.4 in)
1932
132.6 mm (5.2 in)
1933
263.2 mm (10.4 in)
1934
191.2 mm (7.5 in)
1935
128.5 mm (5.1 in)
1936
129.6 mm (5.1 in)
1937
108.9 mm (4.3 in)
1938
99.3 mm (3.9 in)
1939
113.8 mm (4.5 in)
1940
114.1 mm (4.5 in)
1941
126.4 mm (5.0 in)
1942
102.6 mm (4.0 in)
1943
147.1 mm (5.8 in)
1944
63.7 mm (2.5 in)
1945
97.2 mm (3.8 in)
1946
172.0 mm (6.8 in)
1947
115.1 mm (4.5 in)
1948
91.3 mm (3.6 in)
1949
153.2 mm (6.0 in)
1950
132.4 mm (5.2 in)
1951
134.1 mm (5.3 in)
1952
67.3 mm (2.6 in)
1953
102.8 mm (4.0 in)
Longest dry spell (CDD)
The longest dry spell of the year at Roland West Portal, 1921 to 1953. The record is 67 days in 1929, marked on the chart; the median year is 28 days.
Longest dry spell (CDD) at Roland West Portal by year
Year
Longest dry spell (CDD)
1921
43 days
1922
26 days
1923
25 days
1924
28 days
1925
22 days
1926
35 days
1927
24 days
1928
34 days
1929
67 days
1930
20 days
1931
26 days
1932
36 days
1933
25 days
1934
45 days
1935
25 days
1936
43 days
1937
21 days
1938
20 days
1939
55 days
1940
38 days
1941
25 days
1942
39 days
1943
48 days
1944
24 days
1945
43 days
1946
21 days
1947
17 days
1948
28 days
1949
17 days
1950
17 days
1951
36 days
1952
47 days
1953
33 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
27 years with a frost
Across 27 years with a frost, the median last spring frost at Roland West Portal falls on 6 June and the median first autumn frost on 7 September, which leaves a median of 90 days between them.
Fitted over all years, the growing season changes by -9.0 days per decade at this station.
Frost dates and growing season at Roland West Portal
Measure
Median, all years
Earliest period
Recent period (1922 to 1952)
Recent against earliest
Fitted trend
Last spring frost
6 June
n/a
6 June
n/a
+3.9 days per decade
First autumn frost
7 September
n/a
7 September
n/a
-5.0 days per decade
Growing days
90 days
n/a
90 days
n/a
-9.0 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.
Download the Data
Data for Roland West Portal standing records by year: CSV or JSON. Field meanings are on the data page.
Data for Roland West 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 2026-10-14 (14 October 2026). Records are computed by this site and are not official.