Record envelope, standing records and threshold days for Douglas Smelter (USC00022669), Arizona, United States, with 71 years of record.
Key Facts for Douglas Smelter
Douglas Smelter (USC00022669) is a weather station in Arizona, United States at 31.35 latitude and -109.58 longitude, 1,211 m (3,973 ft) above sea level.
The station reports from 1903 to 1973, 71 years of record.
1,464 records set at Douglas Smelter still stand.
Records are tracked for tmax, tmin, prcp, snow, snwd: an element needs 30 years of data to be eligible.
Douglas Smelter set a daily record low maximum temperature of 8.3 C (46.9 F) on 15 March 1973.
About the Station
Location: Arizona, United States, 31.35 latitude, -109.58 longitude.
Elevation: 1,211 m (3,973 ft).
Period of record: 1903 to 1973, 71 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 Douglas Smelter. 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 Douglas Smelter, with 2026 drawn through them
Month
Highest record high
Lowest record low
2026 highest maximum
2026 lowest minimum
Jan
29.4 C (84.9 F)
-21.7 C (-7.1 F)
n/a
n/a
Feb
31.7 C (89.1 F)
-11.7 C (10.9 F)
n/a
n/a
Mar
34.4 C (93.9 F)
-10.0 C (14.0 F)
n/a
n/a
Apr
36.7 C (98.1 F)
-3.9 C (25.0 F)
n/a
n/a
May
41.1 C (106.0 F)
-2.2 C (28.0 F)
n/a
n/a
Jun
43.3 C (109.9 F)
4.4 C (39.9 F)
n/a
n/a
Jul
43.9 C (111.0 F)
5.0 C (41.0 F)
n/a
n/a
Aug
41.7 C (107.1 F)
11.1 C (52.0 F)
n/a
n/a
Sep
40.6 C (105.1 F)
2.8 C (37.0 F)
n/a
n/a
Oct
36.1 C (97.0 F)
-5.0 C (23.0 F)
n/a
n/a
Nov
33.3 C (91.9 F)
-10.0 C (14.0 F)
n/a
n/a
Dec
27.8 C (82.0 F)
-14.4 C (6.1 F)
n/a
n/a
Which Years Hold Standing Records
1,464 standing records
Year with most
1,464 records at Douglas Smelter still stand. 1912 holds the most, with 59.
Standing records at Douglas Smelter by the year they were set
Year set
Standing records
1903
1
1904
39
1905
25
1906
26
1907
32
1908
23
1909
32
1910
48
1911
38
1912
59
1913
41
1914
34
1915
25
1916
34
1917
30
1918
42
1919
17
1920
24
1921
22
1922
25
1923
9
1924
14
1925
22
1926
11
1927
11
1928
10
1929
9
1930
16
1931
5
1932
20
1933
17
1934
9
1935
6
1936
25
1937
17
1938
19
1939
13
1940
22
1941
18
1942
6
1943
29
1944
14
1945
12
1946
18
1947
19
1948
27
1949
31
1950
33
1951
23
1952
12
1953
23
1954
18
1955
26
1956
25
1957
18
1958
24
1959
10
1960
10
1961
9
1962
22
1963
19
1964
15
1965
27
1966
15
1967
9
1968
8
1969
17
1970
14
1971
24
1972
15
1973
2
All-Time Record Progression
4 new records
4 all-time records were set at Douglas Smelter between 10 July 1939 and 30 January 1949. Each dot is a new record.
When Douglas Smelter set new all-time records
Date
Kind
Detail
1939-07-10
Record high minimum temperature
Record high minimum temperature 26.7 C (80.1 F)
1946-01-06
Record snow depth
Record snow depth 15.2 cm (6.0 in)
1947-01-04
Record low maximum temperature
Record low maximum temperature 0.6 C (33.1 F)
1949-01-30
Record low maximum temperature
Record low maximum temperature -0.6 C (30.9 F)
Wettest Day of Each Month
Sep: 90.9 mm (3.6 in)
The wettest day on record for each calendar month at Douglas Smelter. The most was 90.9 mm (3.6 in) on 27 September 1926.
Record daily precipitation for each month at Douglas Smelter
Month
Record daily precipitation (mm)
Date
Jan
60.7 mm (2.4 in)
20 January 1916
Feb
25.4 mm (1.0 in)
11 February 1906
Mar
49.0 mm (1.9 in)
31 March 1945
Apr
21.8 mm (0.9 in)
26 April 1919
May
31.5 mm (1.2 in)
1 May 1916
Jun
49.0 mm (1.9 in)
22 June 1940
Jul
70.6 mm (2.8 in)
19 July 1949
Aug
88.1 mm (3.5 in)
24 August 1959
Sep
90.9 mm (3.6 in)
27 September 1926
Oct
52.8 mm (2.1 in)
8 October 1945
Nov
43.2 mm (1.7 in)
22 November 1919
Dec
50.8 mm (2.0 in)
15 December 1967
Period of Record Coverage
1903 to 1973
Complete yearUnder 90 percent of days
71 years of record at Douglas Smelter, 1903 to 1973. 8 years have data for under 90 percent of days and are left out of rankings: 1903, 1928, 1929, 1944, 1945, 1946, 1947, 1973.
Cooler than the station meanWarmer than the station mean
One stripe for each of 66 complete years at Douglas Smelter, 1904 to 1972. Blue stripes are years cooler than the station's own mean of 17.2 C (62.9 F); red stripes are warmer. The coolest year was 1920, at 16.0 C (60.8 F), and the warmest was 1943, at 18.1 C (64.6 F). The strongest colour marks a difference of 1.2 C (2.2 F).
Annual mean temperature at Douglas Smelter as warming stripes, 1904 to 1972
Year
Annual mean temperature
Difference from the station mean
1904
17.1 C
-0.07 C
1905
17.3 C
+0.11 C
1906
17.3 C
+0.06 C
1907
17.2 C
-0.04 C
1908
16.9 C
-0.28 C
1909
17.0 C
-0.19 C
1910
18.1 C
+0.88 C
1911
17.5 C
+0.26 C
1912
16.2 C
-1.00 C
1913
16.6 C
-0.57 C
1914
16.6 C
-0.59 C
1915
16.9 C
-0.29 C
1916
18.0 C
+0.76 C
1917
17.1 C
-0.10 C
1918
16.8 C
-0.42 C
1920
16.0 C
-1.20 C
1921
16.8 C
-0.39 C
1922
16.7 C
-0.50 C
1923
16.7 C
-0.52 C
1924
16.7 C
-0.47 C
1925
16.8 C
-0.38 C
1926
16.7 C
-0.47 C
1927
17.5 C
+0.35 C
1928
17.4 C
+0.19 C
1929
16.5 C
-0.67 C
1930
16.9 C
-0.28 C
1931
16.9 C
-0.32 C
1932
16.4 C
-0.78 C
1933
16.9 C
-0.25 C
1934
17.8 C
+0.65 C
1935
17.1 C
-0.14 C
1936
17.7 C
+0.46 C
1937
17.6 C
+0.36 C
1938
17.4 C
+0.21 C
1939
17.2 C
-0.04 C
1940
17.8 C
+0.61 C
1941
17.4 C
+0.17 C
1942
17.5 C
+0.32 C
1943
18.1 C
+0.90 C
1944
17.2 C
+0.02 C
1945
17.6 C
+0.44 C
1946
17.6 C
+0.42 C
1947
17.6 C
+0.45 C
1948
17.7 C
+0.54 C
1949
16.8 C
-0.43 C
1950
17.9 C
+0.74 C
1951
17.3 C
+0.10 C
1952
17.3 C
+0.10 C
1953
17.1 C
-0.10 C
1954
18.0 C
+0.81 C
1955
16.5 C
-0.66 C
1956
17.0 C
-0.16 C
1957
17.4 C
+0.25 C
1958
17.4 C
+0.24 C
1959
17.3 C
+0.15 C
1960
17.1 C
-0.14 C
1961
17.5 C
+0.30 C
1962
17.9 C
+0.67 C
1963
17.9 C
+0.70 C
1964
16.6 C
-0.58 C
1967
17.0 C
-0.15 C
1968
16.9 C
-0.29 C
1969
17.3 C
+0.09 C
1970
17.1 C
-0.11 C
1971
17.0 C
-0.19 C
1972
17.4 C
+0.17 C
The annual mean temperature here has risen by 0.06 C (0.00 to 0.12) per decade over 1904 to 1972. In Fahrenheit: 0.11 F (0.00 to 0.21) per decade. The slope is a straight line fitted to 66 complete years; the brackets give its 95 percent interval.
Fitted temperature trends per decade at Douglas Smelter
Measure
Per decade (C)
Per decade (F)
Period
Complete years
Reading
Annual mean temperature
0.06 C (0.00 to 0.12) per decade
0.11 F (0.00 to 0.21) per decade
1904 to 1972
66
Rise
Mean daily maximum
0.03 C (-0.07 to 0.12) per decade
0.05 F (-0.12 to 0.21) per decade
1904 to 1972
66
Not clearly different from zero
Mean daily minimum
0.09 C (0.01 to 0.18) per decade
0.17 F (0.01 to 0.32) per decade
1904 to 1972
66
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
1903 to 1973
Yearly extremes at Douglas Smelter: the record and the median year
Measure
Record
Year of the record
Median year
Years with a value
Hottest day (TXx)
43.9 C (111.0 F)
1905
40.6 C (105.1 F)
71
Coldest night (TNn)
-21.7 C (-7.1 F)
1913
-10.0 C (14.0 F)
71
Wettest day (Rx1day)
90.9 mm (3.6 in)
1926
34.3 mm (1.4 in)
71
Wettest five days (Rx5day)
158.0 mm (6.2 in)
1926
54.4 mm (2.1 in)
71
Longest dry spell (CDD)
149 days
1972
70 days
71
Hottest day (TXx)
The hottest day of the year at Douglas Smelter, 1903 to 1973. The record is 43.9 C (111.0 F) in 1905, marked on the chart; the median year is 40.6 C (105.1 F).
Hottest day (TXx) at Douglas Smelter by year
Year
Hottest day (TXx)
1903
22.2 C (72.0 F)
1904
41.1 C (106.0 F)
1905
43.9 C (111.0 F)
1906
40.6 C (105.1 F)
1907
42.2 C (108.0 F)
1908
40.6 C (105.1 F)
1909
42.8 C (109.0 F)
1910
41.7 C (107.1 F)
1911
40.6 C (105.1 F)
1912
43.3 C (109.9 F)
1913
41.1 C (106.0 F)
1914
37.2 C (99.0 F)
1915
42.2 C (108.0 F)
1916
40.6 C (105.1 F)
1917
40.6 C (105.1 F)
1918
39.4 C (102.9 F)
1919
38.3 C (100.9 F)
1920
40.6 C (105.1 F)
1921
39.4 C (102.9 F)
1922
39.4 C (102.9 F)
1923
40.0 C (104.0 F)
1924
41.1 C (106.0 F)
1925
38.9 C (102.0 F)
1926
38.9 C (102.0 F)
1927
38.9 C (102.0 F)
1928
39.4 C (102.9 F)
1929
41.1 C (106.0 F)
1930
40.0 C (104.0 F)
1931
38.3 C (100.9 F)
1932
40.0 C (104.0 F)
1933
40.0 C (104.0 F)
1934
40.6 C (105.1 F)
1935
40.0 C (104.0 F)
1936
40.6 C (105.1 F)
1937
40.0 C (104.0 F)
1938
40.0 C (104.0 F)
1939
40.6 C (105.1 F)
1940
40.6 C (105.1 F)
1941
38.9 C (102.0 F)
1942
40.6 C (105.1 F)
1943
39.4 C (102.9 F)
1944
40.0 C (104.0 F)
1945
40.0 C (104.0 F)
1946
40.6 C (105.1 F)
1947
39.4 C (102.9 F)
1948
41.1 C (106.0 F)
1949
38.9 C (102.0 F)
1950
41.1 C (106.0 F)
1951
41.1 C (106.0 F)
1952
39.4 C (102.9 F)
1953
41.1 C (106.0 F)
1954
40.6 C (105.1 F)
1955
41.1 C (106.0 F)
1956
39.4 C (102.9 F)
1957
41.7 C (107.1 F)
1958
41.7 C (107.1 F)
1959
40.6 C (105.1 F)
1960
41.7 C (107.1 F)
1961
40.6 C (105.1 F)
1962
40.0 C (104.0 F)
1963
41.1 C (106.0 F)
1964
40.6 C (105.1 F)
1965
39.4 C (102.9 F)
1966
39.4 C (102.9 F)
1967
39.4 C (102.9 F)
1968
41.7 C (107.1 F)
1969
41.7 C (107.1 F)
1970
40.6 C (105.1 F)
1971
40.6 C (105.1 F)
1972
40.6 C (105.1 F)
1973
25.0 C (77.0 F)
Coldest night (TNn)
The coldest night of the year at Douglas Smelter, 1903 to 1973. The record is -21.7 C (-7.1 F) in 1913, marked on the chart; the median year is -10.0 C (14.0 F).
Coldest night (TNn) at Douglas Smelter by year
Year
Coldest night (TNn)
1903
-10.6 C (12.9 F)
1904
-12.2 C (10.0 F)
1905
-7.8 C (18.0 F)
1906
-11.7 C (10.9 F)
1907
-7.8 C (18.0 F)
1908
-7.2 C (19.0 F)
1909
-14.4 C (6.1 F)
1910
-12.8 C (9.0 F)
1911
-13.3 C (8.1 F)
1912
-12.8 C (9.0 F)
1913
-21.7 C (-7.1 F)
1914
-7.8 C (18.0 F)
1915
-8.9 C (16.0 F)
1916
-11.1 C (12.0 F)
1917
-7.8 C (18.0 F)
1918
-8.3 C (17.1 F)
1919
-10.6 C (12.9 F)
1920
-10.0 C (14.0 F)
1921
-10.0 C (14.0 F)
1922
-11.1 C (12.0 F)
1923
-8.3 C (17.1 F)
1924
-7.2 C (19.0 F)
1925
-10.0 C (14.0 F)
1926
-8.3 C (17.1 F)
1927
-6.1 C (21.0 F)
1928
-7.2 C (19.0 F)
1929
-10.6 C (12.9 F)
1930
-7.2 C (19.0 F)
1931
-8.3 C (17.1 F)
1932
-10.6 C (12.9 F)
1933
-11.1 C (12.0 F)
1934
-10.0 C (14.0 F)
1935
-9.4 C (15.1 F)
1936
-7.8 C (18.0 F)
1937
-10.6 C (12.9 F)
1938
-8.3 C (17.1 F)
1939
-7.8 C (18.0 F)
1940
-6.7 C (19.9 F)
1941
-5.6 C (21.9 F)
1942
-6.7 C (19.9 F)
1943
-6.7 C (19.9 F)
1944
-9.4 C (15.1 F)
1945
-7.8 C (18.0 F)
1946
-8.9 C (16.0 F)
1947
-12.2 C (10.0 F)
1948
-13.3 C (8.1 F)
1949
-11.7 C (10.9 F)
1950
-10.0 C (14.0 F)
1951
-10.0 C (14.0 F)
1952
-7.8 C (18.0 F)
1953
-12.2 C (10.0 F)
1954
-11.1 C (12.0 F)
1955
-11.7 C (10.9 F)
1956
-10.0 C (14.0 F)
1957
-8.3 C (17.1 F)
1958
-9.4 C (15.1 F)
1959
-11.7 C (10.9 F)
1960
-10.0 C (14.0 F)
1961
-7.2 C (19.0 F)
1962
-12.2 C (10.0 F)
1963
-8.9 C (16.0 F)
1964
-12.2 C (10.0 F)
1965
-8.9 C (16.0 F)
1966
-11.1 C (12.0 F)
1967
-12.2 C (10.0 F)
1968
-11.1 C (12.0 F)
1969
-7.8 C (18.0 F)
1970
-10.0 C (14.0 F)
1971
-12.8 C (9.0 F)
1972
-9.4 C (15.1 F)
1973
-6.7 C (19.9 F)
Wettest day (Rx1day)
The wettest day of the year at Douglas Smelter, 1903 to 1973. The record is 90.9 mm (3.6 in) in 1926, marked on the chart; the median year is 34.3 mm (1.4 in).
Wettest day (Rx1day) at Douglas Smelter by year
Year
Wettest day (Rx1day)
1903
0.0 mm (0.00 in)
1904
25.4 mm (1.0 in)
1905
33.3 mm (1.3 in)
1906
52.1 mm (2.1 in)
1907
24.9 mm (1.0 in)
1908
29.5 mm (1.2 in)
1909
30.7 mm (1.2 in)
1910
28.7 mm (1.1 in)
1911
48.8 mm (1.9 in)
1912
52.6 mm (2.1 in)
1913
37.6 mm (1.5 in)
1914
37.3 mm (1.5 in)
1915
36.6 mm (1.4 in)
1916
60.7 mm (2.4 in)
1917
30.5 mm (1.2 in)
1918
24.1 mm (0.9 in)
1919
43.7 mm (1.7 in)
1920
21.3 mm (0.8 in)
1921
19.6 mm (0.8 in)
1922
45.2 mm (1.8 in)
1923
27.4 mm (1.1 in)
1924
22.4 mm (0.9 in)
1925
21.1 mm (0.8 in)
1926
90.9 mm (3.6 in)
1927
32.0 mm (1.3 in)
1928
44.2 mm (1.7 in)
1929
51.1 mm (2.0 in)
1930
32.8 mm (1.3 in)
1931
44.2 mm (1.7 in)
1932
23.9 mm (0.9 in)
1933
36.6 mm (1.4 in)
1934
41.7 mm (1.6 in)
1935
30.2 mm (1.2 in)
1936
16.3 mm (0.6 in)
1937
36.8 mm (1.4 in)
1938
35.6 mm (1.4 in)
1939
33.3 mm (1.3 in)
1940
49.0 mm (1.9 in)
1941
36.3 mm (1.4 in)
1942
25.7 mm (1.0 in)
1943
30.2 mm (1.2 in)
1944
46.0 mm (1.8 in)
1945
52.8 mm (2.1 in)
1946
43.2 mm (1.7 in)
1947
45.5 mm (1.8 in)
1948
36.8 mm (1.4 in)
1949
70.6 mm (2.8 in)
1950
47.8 mm (1.9 in)
1951
40.9 mm (1.6 in)
1952
30.0 mm (1.2 in)
1953
47.0 mm (1.9 in)
1954
47.8 mm (1.9 in)
1955
41.1 mm (1.6 in)
1956
17.3 mm (0.7 in)
1957
37.6 mm (1.5 in)
1958
34.3 mm (1.4 in)
1959
88.1 mm (3.5 in)
1960
27.4 mm (1.1 in)
1961
32.3 mm (1.3 in)
1962
28.2 mm (1.1 in)
1963
21.3 mm (0.8 in)
1964
21.1 mm (0.8 in)
1965
29.0 mm (1.1 in)
1966
29.5 mm (1.2 in)
1967
50.8 mm (2.0 in)
1968
34.3 mm (1.4 in)
1969
29.0 mm (1.1 in)
1970
33.0 mm (1.3 in)
1971
18.5 mm (0.7 in)
1972
45.0 mm (1.8 in)
1973
22.6 mm (0.9 in)
Wettest five days (Rx5day)
The wettest five days of the year at Douglas Smelter, 1903 to 1973. The record is 158.0 mm (6.2 in) in 1926, marked on the chart; the median year is 54.4 mm (2.1 in).
Wettest five days (Rx5day) at Douglas Smelter by year
Year
Wettest five days (Rx5day)
1903
0.0 mm (0.00 in)
1904
39.3 mm (1.5 in)
1905
40.4 mm (1.6 in)
1906
67.6 mm (2.7 in)
1907
37.9 mm (1.5 in)
1908
45.2 mm (1.8 in)
1909
63.0 mm (2.5 in)
1910
53.8 mm (2.1 in)
1911
53.4 mm (2.1 in)
1912
64.9 mm (2.6 in)
1913
74.2 mm (2.9 in)
1914
121.9 mm (4.8 in)
1915
62.5 mm (2.5 in)
1916
77.7 mm (3.1 in)
1917
45.7 mm (1.8 in)
1918
40.1 mm (1.6 in)
1919
100.5 mm (4.0 in)
1920
28.9 mm (1.1 in)
1921
53.4 mm (2.1 in)
1922
69.2 mm (2.7 in)
1923
36.3 mm (1.4 in)
1924
27.7 mm (1.1 in)
1925
44.8 mm (1.8 in)
1926
158.0 mm (6.2 in)
1927
55.1 mm (2.2 in)
1928
84.1 mm (3.3 in)
1929
103.5 mm (4.1 in)
1930
67.9 mm (2.7 in)
1931
65.6 mm (2.6 in)
1932
60.8 mm (2.4 in)
1933
46.0 mm (1.8 in)
1934
72.7 mm (2.9 in)
1935
47.5 mm (1.9 in)
1936
18.6 mm (0.7 in)
1937
49.2 mm (1.9 in)
1938
63.1 mm (2.5 in)
1939
78.9 mm (3.1 in)
1940
102.6 mm (4.0 in)
1941
51.8 mm (2.0 in)
1942
30.5 mm (1.2 in)
1943
37.8 mm (1.5 in)
1944
89.8 mm (3.5 in)
1945
56.9 mm (2.2 in)
1946
52.1 mm (2.1 in)
1947
63.8 mm (2.5 in)
1948
45.7 mm (1.8 in)
1949
91.2 mm (3.6 in)
1950
111.2 mm (4.4 in)
1951
46.3 mm (1.8 in)
1952
42.4 mm (1.7 in)
1953
78.3 mm (3.1 in)
1954
82.6 mm (3.3 in)
1955
75.2 mm (3.0 in)
1956
31.0 mm (1.2 in)
1957
76.2 mm (3.0 in)
1958
54.4 mm (2.1 in)
1959
128.6 mm (5.1 in)
1960
54.1 mm (2.1 in)
1961
47.4 mm (1.9 in)
1962
43.8 mm (1.7 in)
1963
28.9 mm (1.1 in)
1964
42.8 mm (1.7 in)
1965
54.3 mm (2.1 in)
1966
84.5 mm (3.3 in)
1967
78.5 mm (3.1 in)
1968
70.4 mm (2.8 in)
1969
44.5 mm (1.8 in)
1970
56.6 mm (2.2 in)
1971
39.1 mm (1.5 in)
1972
55.1 mm (2.2 in)
1973
27.4 mm (1.1 in)
Longest dry spell (CDD)
The longest dry spell of the year at Douglas Smelter, 1903 to 1973. The record is 149 days in 1972, marked on the chart; the median year is 70 days.
Longest dry spell (CDD) at Douglas Smelter by year
Year
Longest dry spell (CDD)
1903
31 days
1904
93 days
1905
40 days
1906
70 days
1907
42 days
1908
45 days
1909
75 days
1910
74 days
1911
68 days
1912
69 days
1913
44 days
1914
61 days
1915
76 days
1916
71 days
1917
101 days
1918
47 days
1919
33 days
1920
55 days
1921
86 days
1922
65 days
1923
69 days
1924
93 days
1925
86 days
1926
38 days
1927
49 days
1928
75 days
1929
71 days
1930
40 days
1931
39 days
1932
117 days
1933
107 days
1934
35 days
1935
60 days
1936
108 days
1937
49 days
1938
94 days
1939
77 days
1940
42 days
1941
73 days
1942
68 days
1943
97 days
1944
73 days
1945
97 days
1946
58 days
1947
54 days
1948
83 days
1949
123 days
1950
112 days
1951
48 days
1952
54 days
1953
116 days
1954
87 days
1955
84 days
1956
123 days
1957
58 days
1958
44 days
1959
64 days
1960
101 days
1961
115 days
1962
64 days
1963
84 days
1964
93 days
1965
88 days
1966
62 days
1967
48 days
1968
80 days
1969
61 days
1970
85 days
1971
65 days
1972
149 days
1973
14 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
66 years with a frost
Across 66 years with a frost, the median last spring frost at Douglas Smelter falls on 7 April and the median first autumn frost on 7 November, which leaves a median of 212 days between them.
In 1941 to 1972 the median growing season was 215 days. That is 4 days more than in 1904 to 1934.
Fitted over all years, the growing season changes by -1.3 days per decade at this station.
Frost dates and growing season at Douglas Smelter
Measure
Median, all years
Earliest period (1904 to 1934)
Recent period (1941 to 1972)
Recent against earliest
Fitted trend
Last spring frost
7 April
9 April
6 April
3 days earlier
+1.2 days per decade
First autumn frost
7 November
8 November
8 November
no change
-0.1 days per decade
Growing days
212 days
211 days
215 days
4 days more
-1.3 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
69 years, 1904 to 1972
A day with at least 34.6 mm (1.4 in) of rain is expected about once in 2 years. A day with at least 83.5 mm (3.3 in) of rain is expected about once in 100 years.
Rainfall return levels at Douglas Smelter: the daily rain expected about once in a given number of years
Expected about once in
A day with at least
Note
2 years
34.6 mm (1.4 in)
5 years
46.8 mm (1.8 in)
10 years
55.3 mm (2.2 in)
25 years
66.3 mm (2.6 in)
50 years
74.8 mm (2.9 in)
100 years
83.5 mm (3.3 in)
Longer than the 69 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, 69 years of values from 1904 to 1972.
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: 90.9 mm (3.6 in) in 1926; 88.1 mm (3.5 in) in 1959; 70.6 mm (2.8 in) in 1949.
Station Changes
No change in the annual mean temperature of this station was found against its neighbours.
Download the Data
Data for Douglas Smelter standing records by year: CSV or JSON. Field meanings are on the data page.
Data for Douglas Smelter 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.