Record envelope, standing records and threshold days for Montrose 1 (USC00055717), Colorado, United States, with 78 years of record.
Key Facts for Montrose 1
Montrose 1 (USC00055717) is a weather station in Colorado, United States at 38.48 latitude and -107.88 longitude, 1,764 m (5,786 ft) above sea level.
The station reports from 1905 to 1982, 78 years of record.
1,464 records set at Montrose 1 still stand.
Records are tracked for tmax, tmin, prcp, snow, snwd: an element needs 30 years of data to be eligible.
Montrose 1 set a daily record precipitation of 15.0 mm (0.6 in) on 13 May 1982.
About the Station
Location: Colorado, United States, 38.48 latitude, -107.88 longitude.
Elevation: 1,764 m (5,786 ft).
Period of record: 1905 to 1982, 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 Montrose 1. 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 Montrose 1, with 2026 drawn through them
Month
Highest record high
Lowest record low
2026 highest maximum
2026 lowest minimum
Jan
16.7 C (62.1 F)
-31.7 C (-25.1 F)
n/a
n/a
Feb
32.2 C (90.0 F)
-32.8 C (-27.0 F)
n/a
n/a
Mar
23.3 C (73.9 F)
-20.6 C (-5.1 F)
n/a
n/a
Apr
27.8 C (82.0 F)
-12.8 C (9.0 F)
n/a
n/a
May
32.2 C (90.0 F)
-8.3 C (17.1 F)
n/a
n/a
Jun
38.9 C (102.0 F)
-2.8 C (27.0 F)
n/a
n/a
Jul
39.4 C (102.9 F)
4.4 C (39.9 F)
n/a
n/a
Aug
37.8 C (100.0 F)
2.8 C (37.0 F)
n/a
n/a
Sep
35.0 C (95.0 F)
-6.1 C (21.0 F)
n/a
n/a
Oct
31.7 C (89.1 F)
-12.8 C (9.0 F)
n/a
n/a
Nov
23.3 C (73.9 F)
-19.4 C (-2.9 F)
n/a
n/a
Dec
20.0 C (68.0 F)
-29.4 C (-20.9 F)
n/a
n/a
Which Years Hold Standing Records
1,464 standing records
Year with most
1,464 records at Montrose 1 still stand. 1909 holds the most, with 83.
Standing records at Montrose 1 by the year they were set
Year set
Standing records
1905
55
1906
61
1907
44
1908
67
1909
83
1910
43
1911
44
1912
23
1913
42
1914
24
1915
34
1916
34
1917
44
1918
37
1919
49
1920
20
1921
61
1922
36
1923
26
1924
45
1925
36
1926
26
1927
39
1928
24
1929
35
1930
29
1931
51
1932
29
1933
63
1934
56
1935
39
1936
36
1937
31
1938
35
1939
35
1940
28
All-Time Record Progression
2 new records
2 all-time records were set at Montrose 1 between 14 October 1947 and 20 October 1963. Each dot is a new record.
When Montrose 1 set new all-time records
Date
Kind
Detail
1947-10-14
Record daily precipitation
Record daily precipitation 39.1 mm (1.5 in)
1963-10-20
Record daily precipitation
Record daily precipitation 40.6 mm (1.6 in)
Wettest Day of Each Month
Oct: 40.6 mm (1.6 in)
The wettest day on record for each calendar month at Montrose 1. The most was 40.6 mm (1.6 in) on 20 October 1963.
Record daily precipitation for each month at Montrose 1
Month
Record daily precipitation (mm)
Date
Jan
36.1 mm (1.4 in)
14 January 1960
Feb
36.3 mm (1.4 in)
11 February 1905
Mar
20.1 mm (0.8 in)
12 March 1950
Apr
30.5 mm (1.2 in)
11 April 1948
May
27.7 mm (1.1 in)
24 May 1906
Jun
28.2 mm (1.1 in)
24 June 1969
Jul
25.4 mm (1.0 in)
10 July 1924
Aug
26.2 mm (1.0 in)
1 August 1964
Sep
35.3 mm (1.4 in)
4 September 1938
Oct
40.6 mm (1.6 in)
20 October 1963
Nov
22.4 mm (0.9 in)
27 November 1919
Dec
22.4 mm (0.9 in)
4 December 1960
Period of Record Coverage
1905 to 1940
Complete yearUnder 90 percent of days
36 years of record at Montrose 1, 1905 to 1940. 3 years have data for under 90 percent of days and are left out of rankings: 1906, 1907, 1910.
Cooler than the station meanWarmer than the station mean
One stripe for each of 31 complete years at Montrose 1, 1909 to 1940. Blue stripes are years cooler than the station's own mean of 9.2 C (48.6 F); red stripes are warmer. The coolest year was 1909, at 7.4 C (45.3 F), and the warmest was 1934, at 11.8 C (53.2 F). The strongest colour marks a difference of 2.6 C (4.7 F).
Annual mean temperature at Montrose 1 as warming stripes, 1909 to 1940
Year
Annual mean temperature
Difference from the station mean
1909
7.4 C
-1.84 C
1911
9.5 C
+0.30 C
1912
8.6 C
-0.64 C
1913
8.6 C
-0.65 C
1914
9.1 C
-0.11 C
1915
9.0 C
-0.25 C
1916
9.3 C
+0.11 C
1917
8.6 C
-0.65 C
1918
8.9 C
-0.33 C
1919
8.8 C
-0.43 C
1920
8.8 C
-0.40 C
1921
10.8 C
+1.58 C
1922
9.6 C
+0.35 C
1923
9.1 C
-0.08 C
1924
8.2 C
-1.04 C
1925
9.3 C
+0.03 C
1926
9.6 C
+0.40 C
1927
9.5 C
+0.32 C
1928
9.2 C
+0.01 C
1929
8.0 C
-1.21 C
1930
8.5 C
-0.71 C
1931
9.5 C
+0.32 C
1932
9.1 C
-0.13 C
1933
9.5 C
+0.32 C
1934
11.8 C
+2.58 C
1935
10.3 C
+1.05 C
1936
10.0 C
+0.75 C
1937
8.6 C
-0.61 C
1938
9.0 C
-0.26 C
1939
9.7 C
+0.52 C
1940
10.0 C
+0.77 C
The annual mean temperature here has risen by 0.4 C (0.1 to 0.7) per decade over 1909 to 1940. In Fahrenheit: 0.7 F (0.1 to 1.3) per decade. The slope is a straight line fitted to 31 complete years; the brackets give its 95 percent interval.
Fitted temperature trends per decade at Montrose 1
Measure
Per decade (C)
Per decade (F)
Period
Complete years
Reading
Annual mean temperature
0.4 C (0.1 to 0.7) per decade
0.7 F (0.1 to 1.3) per decade
1909 to 1940
31
Rise
Mean daily maximum
0.2 C (-0.2 to 0.6) per decade
0.4 F (-0.4 to 1.2) per decade
1909 to 1940
31
Not clearly different from zero
Mean daily minimum
0.5 C (0.3 to 0.8) per decade
1.0 F (0.5 to 1.5) per decade
1909 to 1940
31
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
1905 to 1982
Yearly extremes at Montrose 1: the record and the median year
Measure
Record
Year of the record
Median year
Years with a value
Hottest day (TXx)
39.4 C (102.9 F)
1931
36.1 C (97.0 F)
36
Coldest night (TNn)
-32.8 C (-27.0 F)
1905
-22.5 C (-8.5 F)
36
Wettest day (Rx1day)
40.6 mm (1.6 in)
1963
21.2 mm (0.8 in)
78
Wettest five days (Rx5day)
77.1 mm (3.0 in)
1938
30.4 mm (1.2 in)
78
Longest dry spell (CDD)
82 days
1958
38 days
78
Hottest day (TXx)
The hottest day of the year at Montrose 1, 1905 to 1982. The record is 39.4 C (102.9 F) in 1931, marked on the chart; the median year is 36.1 C (97.0 F).
Hottest day (TXx) at Montrose 1 by year
Year
Hottest day (TXx)
1905
33.3 C (91.9 F)
1906
33.3 C (91.9 F)
1907
36.7 C (98.1 F)
1908
35.0 C (95.0 F)
1909
33.9 C (93.0 F)
1910
33.9 C (93.0 F)
1911
33.3 C (91.9 F)
1912
33.3 C (91.9 F)
1913
35.0 C (95.0 F)
1914
35.0 C (95.0 F)
1915
35.6 C (96.1 F)
1916
35.0 C (95.0 F)
1917
35.6 C (96.1 F)
1918
36.7 C (98.1 F)
1919
35.6 C (96.1 F)
1920
35.6 C (96.1 F)
1921
36.1 C (97.0 F)
1922
36.7 C (98.1 F)
1923
36.7 C (98.1 F)
1924
33.9 C (93.0 F)
1925
38.9 C (102.0 F)
1926
36.7 C (98.1 F)
1927
36.7 C (98.1 F)
1928
35.6 C (96.1 F)
1929
36.7 C (98.1 F)
1930
36.7 C (98.1 F)
1931
39.4 C (102.9 F)
1932
36.1 C (97.0 F)
1933
37.2 C (99.0 F)
1934
38.3 C (100.9 F)
1935
37.8 C (100.0 F)
1936
38.9 C (102.0 F)
1937
35.6 C (96.1 F)
1938
37.8 C (100.0 F)
1939
37.8 C (100.0 F)
1940
38.3 C (100.9 F)
1941
n/a
1942
n/a
1943
n/a
1944
n/a
1945
n/a
1946
n/a
1947
n/a
1948
n/a
1949
n/a
1950
n/a
1951
n/a
1952
n/a
1953
n/a
1954
n/a
1955
n/a
1956
n/a
1957
n/a
1958
n/a
1959
n/a
1960
n/a
1961
n/a
1962
n/a
1963
n/a
1964
n/a
1965
n/a
1966
n/a
1967
n/a
1968
n/a
1969
n/a
1970
n/a
1971
n/a
1972
n/a
1973
n/a
1974
n/a
1975
n/a
1976
n/a
1977
n/a
1978
n/a
1979
n/a
1980
n/a
1981
n/a
1982
n/a
Coldest night (TNn)
The coldest night of the year at Montrose 1, 1905 to 1982. The record is -32.8 C (-27.0 F) in 1905, marked on the chart; the median year is -22.5 C (-8.5 F).
Coldest night (TNn) at Montrose 1 by year
Year
Coldest night (TNn)
1905
-32.8 C (-27.0 F)
1906
-20.6 C (-5.1 F)
1907
-18.9 C (-2.0 F)
1908
-17.8 C (0.0 F)
1909
-25.6 C (-14.1 F)
1910
-24.4 C (-11.9 F)
1911
-27.2 C (-17.0 F)
1912
-21.7 C (-7.1 F)
1913
-31.7 C (-25.1 F)
1914
-21.1 C (-6.0 F)
1915
-23.9 C (-11.0 F)
1916
-22.8 C (-9.0 F)
1917
-21.1 C (-6.0 F)
1918
-28.9 C (-20.0 F)
1919
-29.4 C (-20.9 F)
1920
-21.7 C (-7.1 F)
1921
-16.7 C (1.9 F)
1922
-17.8 C (0.0 F)
1923
-22.2 C (-8.0 F)
1924
-29.4 C (-20.9 F)
1925
-25.6 C (-14.1 F)
1926
-22.2 C (-8.0 F)
1927
-22.8 C (-9.0 F)
1928
-17.8 C (0.0 F)
1929
-25.6 C (-14.1 F)
1930
-25.0 C (-13.0 F)
1931
-21.1 C (-6.0 F)
1932
-26.1 C (-15.0 F)
1933
-30.6 C (-23.1 F)
1934
-14.4 C (6.1 F)
1935
-20.6 C (-5.1 F)
1936
-17.2 C (1.0 F)
1937
-23.9 C (-11.0 F)
1938
-20.0 C (-4.0 F)
1939
-20.0 C (-4.0 F)
1940
-25.0 C (-13.0 F)
1941
n/a
1942
n/a
1943
n/a
1944
n/a
1945
n/a
1946
n/a
1947
n/a
1948
n/a
1949
n/a
1950
n/a
1951
n/a
1952
n/a
1953
n/a
1954
n/a
1955
n/a
1956
n/a
1957
n/a
1958
n/a
1959
n/a
1960
n/a
1961
n/a
1962
n/a
1963
n/a
1964
n/a
1965
n/a
1966
n/a
1967
n/a
1968
n/a
1969
n/a
1970
n/a
1971
n/a
1972
n/a
1973
n/a
1974
n/a
1975
n/a
1976
n/a
1977
n/a
1978
n/a
1979
n/a
1980
n/a
1981
n/a
1982
n/a
Wettest day (Rx1day)
The wettest day of the year at Montrose 1, 1905 to 1982. The record is 40.6 mm (1.6 in) in 1963, marked on the chart; the median year is 21.2 mm (0.8 in).
Wettest day (Rx1day) at Montrose 1 by year
Year
Wettest day (Rx1day)
1905
36.3 mm (1.4 in)
1906
27.7 mm (1.1 in)
1907
16.8 mm (0.7 in)
1908
21.8 mm (0.9 in)
1909
21.1 mm (0.8 in)
1910
13.7 mm (0.5 in)
1911
37.8 mm (1.5 in)
1912
19.1 mm (0.8 in)
1913
14.0 mm (0.6 in)
1914
16.3 mm (0.6 in)
1915
23.4 mm (0.9 in)
1916
18.5 mm (0.7 in)
1917
22.9 mm (0.9 in)
1918
21.6 mm (0.9 in)
1919
22.4 mm (0.9 in)
1920
21.3 mm (0.8 in)
1921
21.6 mm (0.9 in)
1922
16.5 mm (0.6 in)
1923
21.3 mm (0.8 in)
1924
25.4 mm (1.0 in)
1925
22.4 mm (0.9 in)
1926
27.2 mm (1.1 in)
1927
20.8 mm (0.8 in)
1928
21.3 mm (0.8 in)
1929
20.8 mm (0.8 in)
1930
25.4 mm (1.0 in)
1931
13.7 mm (0.5 in)
1932
14.5 mm (0.6 in)
1933
30.2 mm (1.2 in)
1934
19.3 mm (0.8 in)
1935
26.7 mm (1.1 in)
1936
13.7 mm (0.5 in)
1937
19.1 mm (0.8 in)
1938
35.3 mm (1.4 in)
1939
20.3 mm (0.8 in)
1940
24.4 mm (1.0 in)
1941
25.4 mm (1.0 in)
1942
16.0 mm (0.6 in)
1943
22.1 mm (0.9 in)
1944
29.7 mm (1.2 in)
1945
17.3 mm (0.7 in)
1946
21.1 mm (0.8 in)
1947
39.1 mm (1.5 in)
1948
30.5 mm (1.2 in)
1949
12.4 mm (0.5 in)
1950
20.1 mm (0.8 in)
1951
13.2 mm (0.5 in)
1952
14.7 mm (0.6 in)
1953
23.6 mm (0.9 in)
1954
17.0 mm (0.7 in)
1955
22.9 mm (0.9 in)
1956
19.6 mm (0.8 in)
1957
29.2 mm (1.1 in)
1958
15.2 mm (0.6 in)
1959
21.6 mm (0.9 in)
1960
36.1 mm (1.4 in)
1961
23.4 mm (0.9 in)
1962
19.8 mm (0.8 in)
1963
40.6 mm (1.6 in)
1964
26.2 mm (1.0 in)
1965
32.5 mm (1.3 in)
1966
13.0 mm (0.5 in)
1967
20.3 mm (0.8 in)
1968
9.4 mm (0.37 in)
1969
28.2 mm (1.1 in)
1970
19.8 mm (0.8 in)
1971
20.8 mm (0.8 in)
1972
18.5 mm (0.7 in)
1973
15.7 mm (0.6 in)
1974
21.6 mm (0.9 in)
1975
21.8 mm (0.9 in)
1976
15.7 mm (0.6 in)
1977
10.9 mm (0.4 in)
1978
24.6 mm (1.0 in)
1979
20.3 mm (0.8 in)
1980
18.8 mm (0.7 in)
1981
23.6 mm (0.9 in)
1982
15.0 mm (0.6 in)
Wettest five days (Rx5day)
The wettest five days of the year at Montrose 1, 1905 to 1982. The record is 77.1 mm (3.0 in) in 1938, marked on the chart; the median year is 30.4 mm (1.2 in).
Wettest five days (Rx5day) at Montrose 1 by year
Year
Wettest five days (Rx5day)
1905
36.3 mm (1.4 in)
1906
35.4 mm (1.4 in)
1907
19.3 mm (0.8 in)
1908
35.0 mm (1.4 in)
1909
36.9 mm (1.5 in)
1910
22.0 mm (0.9 in)
1911
53.8 mm (2.1 in)
1912
38.6 mm (1.5 in)
1913
20.1 mm (0.8 in)
1914
28.5 mm (1.1 in)
1915
24.4 mm (1.0 in)
1916
28.7 mm (1.1 in)
1917
34.7 mm (1.4 in)
1918
23.1 mm (0.9 in)
1919
46.3 mm (1.8 in)
1920
35.5 mm (1.4 in)
1921
22.9 mm (0.9 in)
1922
18.8 mm (0.7 in)
1923
30.5 mm (1.2 in)
1924
42.7 mm (1.7 in)
1925
39.2 mm (1.5 in)
1926
31.5 mm (1.2 in)
1927
32.8 mm (1.3 in)
1928
33.1 mm (1.3 in)
1929
56.7 mm (2.2 in)
1930
35.0 mm (1.4 in)
1931
21.6 mm (0.9 in)
1932
24.5 mm (1.0 in)
1933
32.5 mm (1.3 in)
1934
27.2 mm (1.1 in)
1935
17.3 mm (0.7 in)
1936
22.1 mm (0.9 in)
1937
36.4 mm (1.4 in)
1938
77.1 mm (3.0 in)
1939
30.5 mm (1.2 in)
1940
35.9 mm (1.4 in)
1941
48.3 mm (1.9 in)
1942
28.7 mm (1.1 in)
1943
36.5 mm (1.4 in)
1944
36.0 mm (1.4 in)
1945
22.3 mm (0.9 in)
1946
29.0 mm (1.1 in)
1947
51.0 mm (2.0 in)
1948
36.1 mm (1.4 in)
1949
25.4 mm (1.0 in)
1950
20.1 mm (0.8 in)
1951
24.9 mm (1.0 in)
1952
18.8 mm (0.7 in)
1953
34.3 mm (1.4 in)
1954
30.0 mm (1.2 in)
1955
26.9 mm (1.1 in)
1956
26.5 mm (1.0 in)
1957
37.8 mm (1.5 in)
1958
16.5 mm (0.6 in)
1959
40.0 mm (1.6 in)
1960
47.7 mm (1.9 in)
1961
28.2 mm (1.1 in)
1962
25.3 mm (1.0 in)
1963
46.0 mm (1.8 in)
1964
41.0 mm (1.6 in)
1965
49.6 mm (2.0 in)
1966
18.2 mm (0.7 in)
1967
28.6 mm (1.1 in)
1968
17.1 mm (0.7 in)
1969
32.5 mm (1.3 in)
1970
39.1 mm (1.5 in)
1971
22.6 mm (0.9 in)
1972
36.1 mm (1.4 in)
1973
24.7 mm (1.0 in)
1974
30.3 mm (1.2 in)
1975
23.1 mm (0.9 in)
1976
24.1 mm (0.9 in)
1977
19.7 mm (0.8 in)
1978
45.8 mm (1.8 in)
1979
32.7 mm (1.3 in)
1980
29.0 mm (1.1 in)
1981
27.9 mm (1.1 in)
1982
27.5 mm (1.1 in)
Longest dry spell (CDD)
The longest dry spell of the year at Montrose 1, 1905 to 1982. The record is 82 days in 1958, marked on the chart; the median year is 38 days.
Longest dry spell (CDD) at Montrose 1 by year
Year
Longest dry spell (CDD)
1905
39 days
1906
42 days
1907
46 days
1908
32 days
1909
41 days
1910
63 days
1911
42 days
1912
33 days
1913
45 days
1914
28 days
1915
41 days
1916
48 days
1917
56 days
1918
61 days
1919
25 days
1920
34 days
1921
2 days
1922
54 days
1923
33 days
1924
28 days
1925
22 days
1926
23 days
1927
33 days
1928
30 days
1929
39 days
1930
37 days
1931
33 days
1932
38 days
1933
38 days
1934
38 days
1935
43 days
1936
32 days
1937
31 days
1938
41 days
1939
42 days
1940
39 days
1941
17 days
1942
35 days
1943
46 days
1944
31 days
1945
36 days
1946
30 days
1947
30 days
1948
30 days
1949
38 days
1950
33 days
1951
32 days
1952
48 days
1953
43 days
1954
32 days
1955
27 days
1956
33 days
1957
25 days
1958
82 days
1959
36 days
1960
26 days
1961
37 days
1962
37 days
1963
55 days
1964
38 days
1965
28 days
1966
43 days
1967
31 days
1968
49 days
1969
32 days
1970
32 days
1971
57 days
1972
73 days
1973
43 days
1974
40 days
1975
39 days
1976
46 days
1977
40 days
1978
37 days
1979
44 days
1980
43 days
1981
51 days
1982
48 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
31 years with a frost
Across 31 years with a frost, the median last spring frost at Montrose 1 falls on 10 May and the median first autumn frost on 29 September, which leaves a median of 148 days between them.
Fitted over all years, the growing season changes by +12.5 days per decade at this station.
Frost dates and growing season at Montrose 1
Measure
Median, all years
Earliest period
Recent period (1911 to 1940)
Recent against earliest
Fitted trend
Last spring frost
10 May
n/a
9 May
n/a
-6.0 days per decade
First autumn frost
29 September
n/a
29 September
n/a
+6.5 days per decade
Growing days
148 days
n/a
149 days
n/a
+12.5 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
71 years, 1905 to 1979
A day with at least 21.1 mm (0.8 in) of rain is expected about once in 2 years. A day with at least 42.6 mm (1.7 in) of rain is expected about once in 100 years.
Rainfall return levels at Montrose 1: the daily rain expected about once in a given number of years
Expected about once in
A day with at least
Note
2 years
21.1 mm (0.8 in)
5 years
27.3 mm (1.1 in)
10 years
31.2 mm (1.2 in)
25 years
35.9 mm (1.4 in)
50 years
39.3 mm (1.5 in)
100 years
42.6 mm (1.7 in)
Longer than the 71 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, 71 years of values from 1905 to 1979.
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: 40.6 mm (1.6 in) in 1963; 39.1 mm (1.5 in) in 1947; 37.8 mm (1.5 in) in 1911.
Download the Data
Data for Montrose 1 standing records by year: CSV or JSON. Field meanings are on the data page.
Data for Montrose 1 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.