Record envelope, standing records and threshold days for Meridian 1 W (USC00105841), Idaho, United States, with 50 years of record.
Key Facts for Meridian 1 W
Meridian 1 W (USC00105841) is a weather station in Idaho, United States at 43.62 latitude and -116.42 longitude, 799 m (2,621 ft) above sea level.
The station reports from 1911 to 1960, 50 years of record.
1,464 records set at Meridian 1 W still stand.
Records are tracked for tmax, tmin, prcp, snow: an element needs 30 years of data to be eligible.
Meridian 1 W set a daily record precipitation of 14.0 mm (0.6 in) on 7 March 1960.
About the Station
Location: Idaho, United States, 43.62 latitude, -116.42 longitude.
Elevation: 799 m (2,621 ft).
Period of record: 1911 to 1960, 50 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 Meridian 1 W. 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 Meridian 1 W, with 2026 drawn through them
Month
Highest record high
Lowest record low
2026 highest maximum
2026 lowest minimum
Jan
17.8 C (64.0 F)
-32.2 C (-26.0 F)
n/a
n/a
Feb
21.1 C (70.0 F)
-26.7 C (-16.1 F)
n/a
n/a
Mar
25.6 C (78.1 F)
-13.9 C (7.0 F)
n/a
n/a
Apr
33.3 C (91.9 F)
-13.9 C (7.0 F)
n/a
n/a
May
38.3 C (100.9 F)
-5.6 C (21.9 F)
n/a
n/a
Jun
41.7 C (107.1 F)
-1.7 C (28.9 F)
n/a
n/a
Jul
43.3 C (109.9 F)
2.8 C (37.0 F)
n/a
n/a
Aug
42.8 C (109.0 F)
0.6 C (33.1 F)
n/a
n/a
Sep
40.6 C (105.1 F)
-5.6 C (21.9 F)
n/a
n/a
Oct
31.7 C (89.1 F)
-8.9 C (16.0 F)
n/a
n/a
Nov
24.4 C (75.9 F)
-20.6 C (-5.1 F)
n/a
n/a
Dec
20.6 C (69.1 F)
-34.4 C (-29.9 F)
n/a
n/a
Which Years Hold Standing Records
1,464 standing records
Year with most
1,464 records at Meridian 1 W still stand. 1931 holds the most, with 54.
Standing records at Meridian 1 W by the year they were set
Year set
Standing records
1911
25
1912
27
1913
31
1914
32
1915
34
1916
48
1917
53
1918
41
1919
49
1920
27
1921
18
1922
26
1923
20
1924
53
1925
29
1926
36
1927
35
1928
29
1929
44
1930
42
1931
54
1932
25
1933
28
1934
40
1935
31
1936
34
1937
34
1938
25
1939
29
1940
42
1941
14
1942
24
1943
23
1944
9
1945
25
1946
14
1947
18
1948
15
1949
28
1950
28
1951
30
1952
24
1953
30
1954
29
1955
31
1956
20
1957
20
1958
14
1959
19
1960
8
Wettest Day of Each Month
Jan: 41.9 mm (1.6 in)
The wettest day on record for each calendar month at Meridian 1 W. The most was 41.9 mm (1.6 in) on 18 January 1953.
Record daily precipitation for each month at Meridian 1 W
Month
Record daily precipitation (mm)
Date
Jan
41.9 mm (1.6 in)
18 January 1953
Feb
41.9 mm (1.6 in)
2 February 1916
Mar
27.4 mm (1.1 in)
25 March 1948
Apr
22.4 mm (0.9 in)
18 April 1955
May
36.1 mm (1.4 in)
12 May 1958
Jun
38.1 mm (1.5 in)
3 June 1948
Jul
27.9 mm (1.1 in)
24 July 1913
Aug
32.3 mm (1.3 in)
9 August 1930
Sep
29.2 mm (1.1 in)
23 September 1918
Oct
32.0 mm (1.3 in)
7 October 1916
Nov
23.9 mm (0.9 in)
29 November 1917
Dec
33.3 mm (1.3 in)
23 December 1955
Period of Record Coverage
1911 to 1960
Complete yearUnder 90 percent of days
50 years of record at Meridian 1 W, 1911 to 1960. 2 years have data for under 90 percent of days and are left out of rankings: 1932, 1960.
Cooler than the station meanWarmer than the station mean
One stripe for each of 44 complete years at Meridian 1 W, 1911 to 1959. Blue stripes are years cooler than the station's own mean of 10.1 C (50.2 F); red stripes are warmer. The coolest year was 1916, at 8.6 C (47.5 F), and the warmest was 1940, at 12.1 C (53.7 F). The strongest colour marks a difference of 2.0 C (3.6 F).
Annual mean temperature at Meridian 1 W as warming stripes, 1911 to 1959
Year
Annual mean temperature
Difference from the station mean
1911
9.5 C
-0.57 C
1912
9.5 C
-0.65 C
1913
9.6 C
-0.51 C
1914
10.3 C
+0.22 C
1916
8.6 C
-1.52 C
1917
9.5 C
-0.63 C
1918
10.4 C
+0.29 C
1919
9.7 C
-0.41 C
1920
10.0 C
-0.15 C
1921
10.5 C
+0.39 C
1922
9.4 C
-0.68 C
1923
10.1 C
+0.02 C
1924
10.0 C
-0.14 C
1925
11.3 C
+1.23 C
1926
11.5 C
+1.35 C
1927
9.8 C
-0.33 C
1928
10.6 C
+0.47 C
1929
9.7 C
-0.44 C
1930
10.6 C
+0.44 C
1931
11.0 C
+0.91 C
1933
9.9 C
-0.24 C
1935
9.6 C
-0.54 C
1936
10.3 C
+0.20 C
1937
10.2 C
+0.08 C
1938
10.8 C
+0.70 C
1939
11.3 C
+1.21 C
1940
12.1 C
+1.96 C
1941
10.9 C
+0.80 C
1942
9.4 C
-0.73 C
1943
10.2 C
+0.05 C
1944
9.6 C
-0.51 C
1945
10.2 C
+0.06 C
1946
10.1 C
-0.01 C
1947
10.1 C
-0.05 C
1948
9.2 C
-0.95 C
1950
9.8 C
-0.34 C
1951
8.6 C
-1.47 C
1952
9.7 C
-0.42 C
1953
10.8 C
+0.72 C
1954
10.2 C
+0.07 C
1955
9.0 C
-1.07 C
1956
9.8 C
-0.28 C
1958
11.2 C
+1.12 C
1959
10.3 C
+0.21 C
The fitted trend in annual mean temperature here over 1911 to 1959 is 0.04 C (-0.12 to 0.21) per decade. The interval includes zero, so the trend is not clearly different from zero. In Fahrenheit: 0.1 F (-0.2 to 0.4) per decade. The slope is a straight line fitted to 44 complete years; the brackets give its 95 percent interval.
Fitted temperature trends per decade at Meridian 1 W
Measure
Per decade (C)
Per decade (F)
Period
Complete years
Reading
Annual mean temperature
0.04 C (-0.12 to 0.21) per decade
0.1 F (-0.2 to 0.4) per decade
1911 to 1959
44
Not clearly different from zero
Mean daily maximum
0.01 C (-0.19 to 0.21) per decade
0.02 F (-0.34 to 0.38) per decade
1911 to 1959
44
Not clearly different from zero
Mean daily minimum
0.1 C (-0.1 to 0.3) per decade
0.1 F (-0.2 to 0.5) per decade
1911 to 1959
44
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
1911 to 1960
Yearly extremes at Meridian 1 W: 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)
1930
38.3 C (100.9 F)
50
Coldest night (TNn)
-34.4 C (-29.9 F)
1924
-21.7 C (-7.1 F)
50
Wettest day (Rx1day)
41.9 mm (1.6 in)
1916
20.2 mm (0.8 in)
50
Wettest five days (Rx5day)
77.2 mm (3.0 in)
1953
36.3 mm (1.4 in)
50
Longest dry spell (CDD)
123 days
1952
57 days
50
Hottest day (TXx)
The hottest day of the year at Meridian 1 W, 1911 to 1960. The record is 43.3 C (109.9 F) in 1930, marked on the chart; the median year is 38.3 C (100.9 F).
Hottest day (TXx) at Meridian 1 W by year
Year
Hottest day (TXx)
1911
38.3 C (100.9 F)
1912
36.7 C (98.1 F)
1913
37.8 C (100.0 F)
1914
38.9 C (102.0 F)
1915
41.1 C (106.0 F)
1916
38.3 C (100.9 F)
1917
40.6 C (105.1 F)
1918
40.0 C (104.0 F)
1919
41.7 C (107.1 F)
1920
40.6 C (105.1 F)
1921
38.3 C (100.9 F)
1922
40.0 C (104.0 F)
1923
38.3 C (100.9 F)
1924
41.7 C (107.1 F)
1925
42.2 C (108.0 F)
1926
42.8 C (109.0 F)
1927
36.7 C (98.1 F)
1928
40.6 C (105.1 F)
1929
37.8 C (100.0 F)
1930
43.3 C (109.9 F)
1931
43.3 C (109.9 F)
1932
37.8 C (100.0 F)
1933
38.3 C (100.9 F)
1934
41.7 C (107.1 F)
1935
40.6 C (105.1 F)
1936
39.4 C (102.9 F)
1937
40.6 C (105.1 F)
1938
40.0 C (104.0 F)
1939
40.6 C (105.1 F)
1940
41.7 C (107.1 F)
1941
39.4 C (102.9 F)
1942
39.4 C (102.9 F)
1943
37.2 C (99.0 F)
1944
36.7 C (98.1 F)
1945
37.8 C (100.0 F)
1946
38.3 C (100.9 F)
1947
37.8 C (100.0 F)
1948
35.6 C (96.1 F)
1949
39.4 C (102.9 F)
1950
38.3 C (100.9 F)
1951
38.3 C (100.9 F)
1952
36.1 C (97.0 F)
1953
39.4 C (102.9 F)
1954
35.6 C (96.1 F)
1955
37.8 C (100.0 F)
1956
37.2 C (99.0 F)
1957
35.6 C (96.1 F)
1958
36.7 C (98.1 F)
1959
38.3 C (100.9 F)
1960
12.8 C (55.0 F)
Coldest night (TNn)
The coldest night of the year at Meridian 1 W, 1911 to 1960. The record is -34.4 C (-29.9 F) in 1924, marked on the chart; the median year is -21.7 C (-7.1 F).
Coldest night (TNn) at Meridian 1 W by year
Year
Coldest night (TNn)
1911
-17.8 C (0.0 F)
1912
-26.1 C (-15.0 F)
1913
-20.0 C (-4.0 F)
1914
-22.2 C (-8.0 F)
1915
-22.2 C (-8.0 F)
1916
-22.2 C (-8.0 F)
1917
-22.8 C (-9.0 F)
1918
-21.7 C (-7.1 F)
1919
-26.7 C (-16.1 F)
1920
-15.6 C (3.9 F)
1921
-12.8 C (9.0 F)
1922
-27.8 C (-18.0 F)
1923
-19.4 C (-2.9 F)
1924
-34.4 C (-29.9 F)
1925
-13.9 C (7.0 F)
1926
-22.2 C (-8.0 F)
1927
-19.4 C (-2.9 F)
1928
-20.6 C (-5.1 F)
1929
-22.2 C (-8.0 F)
1930
-32.2 C (-26.0 F)
1931
-23.3 C (-9.9 F)
1932
-23.3 C (-9.9 F)
1933
-26.7 C (-16.1 F)
1934
-8.3 C (17.1 F)
1935
-22.8 C (-9.0 F)
1936
-21.7 C (-7.1 F)
1937
-30.6 C (-23.1 F)
1938
-13.9 C (7.0 F)
1939
-14.4 C (6.1 F)
1940
-12.2 C (10.0 F)
1941
-12.8 C (9.0 F)
1942
-25.0 C (-13.0 F)
1943
-23.3 C (-9.9 F)
1944
-18.3 C (-0.9 F)
1945
-21.1 C (-6.0 F)
1946
-11.7 C (10.9 F)
1947
-23.3 C (-9.9 F)
1948
-20.0 C (-4.0 F)
1949
-23.9 C (-11.0 F)
1950
-28.9 C (-20.0 F)
1951
-18.9 C (-2.0 F)
1952
-22.8 C (-9.0 F)
1953
-11.7 C (10.9 F)
1954
-17.8 C (0.0 F)
1955
-20.6 C (-5.1 F)
1956
-23.3 C (-9.9 F)
1957
-28.3 C (-18.9 F)
1958
-13.3 C (8.1 F)
1959
-17.8 C (0.0 F)
1960
-15.6 C (3.9 F)
Wettest day (Rx1day)
The wettest day of the year at Meridian 1 W, 1911 to 1960. The record is 41.9 mm (1.6 in) in 1916, marked on the chart; the median year is 20.2 mm (0.8 in).
Wettest day (Rx1day) at Meridian 1 W by year
Year
Wettest day (Rx1day)
1911
20.1 mm (0.8 in)
1912
25.9 mm (1.0 in)
1913
27.9 mm (1.1 in)
1914
7.6 mm (0.30 in)
1915
18.0 mm (0.7 in)
1916
41.9 mm (1.6 in)
1917
25.4 mm (1.0 in)
1918
29.2 mm (1.1 in)
1919
18.8 mm (0.7 in)
1920
18.8 mm (0.7 in)
1921
13.5 mm (0.5 in)
1922
15.0 mm (0.6 in)
1923
20.3 mm (0.8 in)
1924
23.6 mm (0.9 in)
1925
25.9 mm (1.0 in)
1926
12.7 mm (0.5 in)
1927
14.0 mm (0.6 in)
1928
12.2 mm (0.5 in)
1929
15.2 mm (0.6 in)
1930
32.3 mm (1.3 in)
1931
17.8 mm (0.7 in)
1932
23.4 mm (0.9 in)
1933
16.5 mm (0.6 in)
1934
17.5 mm (0.7 in)
1935
16.8 mm (0.7 in)
1936
21.8 mm (0.9 in)
1937
24.1 mm (0.9 in)
1938
33.5 mm (1.3 in)
1939
19.6 mm (0.8 in)
1940
14.5 mm (0.6 in)
1941
33.5 mm (1.3 in)
1942
24.1 mm (0.9 in)
1943
25.4 mm (1.0 in)
1944
17.3 mm (0.7 in)
1945
15.5 mm (0.6 in)
1946
14.0 mm (0.6 in)
1947
22.9 mm (0.9 in)
1948
38.1 mm (1.5 in)
1949
12.4 mm (0.5 in)
1950
15.7 mm (0.6 in)
1951
21.6 mm (0.9 in)
1952
19.1 mm (0.8 in)
1953
41.9 mm (1.6 in)
1954
15.2 mm (0.6 in)
1955
33.3 mm (1.3 in)
1956
21.8 mm (0.9 in)
1957
22.6 mm (0.9 in)
1958
36.1 mm (1.4 in)
1959
24.1 mm (0.9 in)
1960
14.0 mm (0.6 in)
Wettest five days (Rx5day)
The wettest five days of the year at Meridian 1 W, 1911 to 1960. The record is 77.2 mm (3.0 in) in 1953, marked on the chart; the median year is 36.3 mm (1.4 in).
Wettest five days (Rx5day) at Meridian 1 W by year
Year
Wettest five days (Rx5day)
1911
38.3 mm (1.5 in)
1912
47.5 mm (1.9 in)
1913
44.6 mm (1.8 in)
1914
17.7 mm (0.7 in)
1915
37.2 mm (1.5 in)
1916
73.4 mm (2.9 in)
1917
35.3 mm (1.4 in)
1918
31.7 mm (1.2 in)
1919
28.4 mm (1.1 in)
1920
32.8 mm (1.3 in)
1921
46.6 mm (1.8 in)
1922
18.3 mm (0.7 in)
1923
51.0 mm (2.0 in)
1924
48.2 mm (1.9 in)
1925
52.3 mm (2.1 in)
1926
30.2 mm (1.2 in)
1927
36.5 mm (1.4 in)
1928
26.7 mm (1.1 in)
1929
36.9 mm (1.5 in)
1930
40.7 mm (1.6 in)
1931
26.9 mm (1.1 in)
1932
70.7 mm (2.8 in)
1933
28.4 mm (1.1 in)
1934
34.1 mm (1.3 in)
1935
38.9 mm (1.5 in)
1936
38.0 mm (1.5 in)
1937
38.6 mm (1.5 in)
1938
35.1 mm (1.4 in)
1939
25.5 mm (1.0 in)
1940
28.4 mm (1.1 in)
1941
39.8 mm (1.6 in)
1942
53.4 mm (2.1 in)
1943
37.1 mm (1.5 in)
1944
38.2 mm (1.5 in)
1945
32.8 mm (1.3 in)
1946
26.9 mm (1.1 in)
1947
31.8 mm (1.3 in)
1948
41.1 mm (1.6 in)
1949
19.3 mm (0.8 in)
1950
30.4 mm (1.2 in)
1951
40.9 mm (1.6 in)
1952
20.8 mm (0.8 in)
1953
77.2 mm (3.0 in)
1954
27.9 mm (1.1 in)
1955
49.6 mm (2.0 in)
1956
31.8 mm (1.3 in)
1957
35.5 mm (1.4 in)
1958
36.1 mm (1.4 in)
1959
37.6 mm (1.5 in)
1960
24.1 mm (0.9 in)
Longest dry spell (CDD)
The longest dry spell of the year at Meridian 1 W, 1911 to 1960. The record is 123 days in 1952, marked on the chart; the median year is 57 days.
Longest dry spell (CDD) at Meridian 1 W by year
Year
Longest dry spell (CDD)
1911
47 days
1912
37 days
1913
56 days
1914
39 days
1915
52 days
1916
44 days
1917
92 days
1918
29 days
1919
105 days
1920
56 days
1921
58 days
1922
42 days
1923
70 days
1924
117 days
1925
30 days
1926
50 days
1927
27 days
1928
58 days
1929
47 days
1930
49 days
1931
39 days
1932
79 days
1933
87 days
1934
37 days
1935
76 days
1936
90 days
1937
79 days
1938
41 days
1939
69 days
1940
64 days
1941
30 days
1942
82 days
1943
97 days
1944
86 days
1945
66 days
1946
60 days
1947
87 days
1948
84 days
1949
88 days
1950
32 days
1951
48 days
1952
123 days
1953
46 days
1954
54 days
1955
71 days
1956
63 days
1957
89 days
1958
39 days
1959
49 days
1960
16 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
44 years with a frost
Across 44 years with a frost, the median last spring frost at Meridian 1 W falls on 11 May and the median first autumn frost on 24 September, which leaves a median of 134 days between them.
Fitted over all years, the growing season changes by +3.5 days per decade at this station.
Frost dates and growing season at Meridian 1 W
Measure
Median, all years
Earliest period
Recent period (1926 to 1959)
Recent against earliest
Fitted trend
Last spring frost
11 May
n/a
11 May
n/a
-3.0 days per decade
First autumn frost
24 September
n/a
22 September
n/a
+0.5 days per decade
Growing days
134 days
n/a
132 days
n/a
+3.5 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
48 years, 1911 to 1959
A day with at least 20.7 mm (0.8 in) of rain is expected about once in 2 years. A day with at least 48.6 mm (1.9 in) of rain is expected about once in 100 years.
Rainfall return levels at Meridian 1 W: the daily rain expected about once in a given number of years
Expected about once in
A day with at least
Note
2 years
20.7 mm (0.8 in)
5 years
28.0 mm (1.1 in)
10 years
32.9 mm (1.3 in)
25 years
39.2 mm (1.5 in)
50 years
43.9 mm (1.7 in)
Longer than the 48 years of record
100 years
48.6 mm (1.9 in)
Longer than the 48 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, 48 years of values from 1911 to 1959.
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: 41.9 mm (1.6 in) in 1916; 41.9 mm (1.6 in) in 1953; 38.1 mm (1.5 in) in 1948.
Station Changes
No change in the annual mean temperature of this station was found against its neighbours.
Download the Data
Data for Meridian 1 W standing records by year: CSV or JSON. Field meanings are on the data page.
Data for Meridian 1 W 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.