Record envelope, standing records and threshold days for Delta (USC00052192), Colorado, United States, with 107 years of record.
Key Facts for Delta
Delta (USC00052192) is a weather station in Colorado, United States at 38.75 latitude and -108.08 longitude, 1,503 m (4,930 ft) above sea level.
The station reports from 1893 to 1999, 107 years of record.
1,464 records set at Delta still stand.
Records are tracked for tmax, tmin, prcp, snow, snwd: an element needs 30 years of data to be eligible.
Delta set a daily record precipitation of 3.3 mm (0.13 in) on 3 December 1999.
About the Station
Location: Colorado, United States, 38.75 latitude, -108.08 longitude.
Elevation: 1,503 m (4,930 ft).
Period of record: 1893 to 1999, 107 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 Delta. 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 Delta, with 2026 drawn through them
Month
Highest record high
Lowest record low
2026 highest maximum
2026 lowest minimum
Jan
22.2 C (72.0 F)
-37.8 C (-36.0 F)
n/a
n/a
Feb
25.6 C (78.1 F)
-32.8 C (-27.0 F)
n/a
n/a
Mar
28.3 C (82.9 F)
-18.9 C (-2.0 F)
n/a
n/a
Apr
35.0 C (95.0 F)
-13.3 C (8.1 F)
n/a
n/a
May
37.8 C (100.0 F)
-7.8 C (18.0 F)
n/a
n/a
Jun
42.2 C (108.0 F)
-1.7 C (28.9 F)
n/a
n/a
Jul
42.8 C (109.0 F)
2.2 C (36.0 F)
n/a
n/a
Aug
42.8 C (109.0 F)
0.6 C (33.1 F)
n/a
n/a
Sep
38.3 C (100.9 F)
-6.7 C (19.9 F)
n/a
n/a
Oct
32.2 C (90.0 F)
-11.7 C (10.9 F)
n/a
n/a
Nov
29.4 C (84.9 F)
-23.9 C (-11.0 F)
n/a
n/a
Dec
19.4 C (66.9 F)
-31.1 C (-24.0 F)
n/a
n/a
Which Years Hold Standing Records
1,464 standing records
Year with most
1,464 records at Delta still stand. 1896 holds the most, with 43.
Standing records at Delta by the year they were set
Year set
Standing records
1893
10
1894
23
1895
24
1896
43
1897
17
1898
27
1899
31
1900
32
1901
17
1902
25
1903
20
1904
16
1905
15
1906
11
1907
21
1908
26
1909
26
1910
23
1911
24
1912
16
1913
19
1914
9
1915
14
1916
12
1917
16
1918
15
1919
9
1920
6
1921
18
1922
14
1923
8
1924
9
1925
8
1926
8
1927
14
1928
16
1929
14
1930
16
1931
25
1932
9
1933
14
1934
16
1935
8
1936
11
1937
6
1938
10
1939
9
1940
11
1941
7
1942
10
1943
22
1944
11
1945
13
1946
12
1947
11
1948
19
1949
12
1950
16
1951
17
1952
16
1953
11
1954
20
1955
19
1956
23
1957
9
1958
2
1959
14
1960
7
1961
11
1962
16
1963
14
1964
4
1965
17
1966
9
1967
5
1968
7
1969
11
1970
18
1971
25
1972
13
1974
13
1975
8
1976
1
1977
9
1978
6
1979
18
1980
14
1981
14
1982
5
1983
9
1984
12
1985
12
1986
16
1989
35
1990
15
1991
12
1992
3
1993
11
1994
2
1995
11
1996
5
1997
1
1998
13
1999
7
All-Time Record Progression
4 new records
4 all-time records were set at Delta between 29 November 1954 and 28 March 1985. Each dot is a new record.
When Delta set new all-time records
Date
Kind
Detail
1954-11-29
Record daily snowfall
Record daily snowfall 24.1 cm (9.5 in)
1963-01-12
Record low maximum temperature
Record low maximum temperature -14.4 C (6.1 F)
1971-01-06
Record low maximum temperature
Record low maximum temperature -15.0 C (5.0 F)
1985-03-28
Record daily snowfall
Record daily snowfall 33.0 cm (13.0 in)
Wettest Day of Each Month
Aug: 63.5 mm (2.5 in)
The wettest day on record for each calendar month at Delta. The most was 63.5 mm (2.5 in) on 15 August 1893.
Record daily precipitation for each month at Delta
Month
Record daily precipitation (mm)
Date
Jan
23.1 mm (0.9 in)
6 January 1930
Feb
27.9 mm (1.1 in)
2 February 1897
Mar
27.9 mm (1.1 in)
20 March 1912
Apr
25.4 mm (1.0 in)
29 April 1906
May
47.0 mm (1.9 in)
24 May 1906
Jun
37.6 mm (1.5 in)
18 June 1995
Jul
38.1 mm (1.5 in)
22 July 1893
Aug
63.5 mm (2.5 in)
15 August 1893
Sep
33.0 mm (1.3 in)
29 September 1995
Oct
40.6 mm (1.6 in)
13 October 1957
Nov
41.9 mm (1.6 in)
27 November 1919
Dec
24.1 mm (0.9 in)
12 December 1937
Period of Record Coverage
1893 to 1999
Complete yearUnder 90 percent of days
106 years of record at Delta, 1893 to 1999. 16 years have data for under 90 percent of days and are left out of rankings: 1896, 1903, 1904, 1905, 1906, 1972, 1975, 1976 and others.
Cooler than the station meanWarmer than the station mean
One stripe for each of 81 complete years at Delta, 1893 to 1999. Blue stripes are years cooler than the station's own mean of 10.3 C (50.5 F); red stripes are warmer. The coolest year was 1917, at 8.9 C (48.0 F), and the warmest was 1934, at 12.5 C (54.4 F). The strongest colour marks a difference of 2.2 C (4.0 F).
Annual mean temperature at Delta as warming stripes, 1893 to 1999
Year
Annual mean temperature
Difference from the station mean
1893
9.6 C
-0.66 C
1894
9.8 C
-0.48 C
1895
9.9 C
-0.39 C
1897
9.9 C
-0.38 C
1898
9.4 C
-0.91 C
1900
11.3 C
+0.99 C
1901
11.1 C
+0.85 C
1902
9.6 C
-0.66 C
1908
9.9 C
-0.35 C
1909
10.2 C
-0.03 C
1910
11.2 C
+0.93 C
1911
10.2 C
-0.06 C
1913
9.2 C
-1.03 C
1914
10.1 C
-0.20 C
1915
9.7 C
-0.55 C
1917
8.9 C
-1.38 C
1918
9.6 C
-0.72 C
1919
9.2 C
-1.11 C
1920
9.2 C
-1.06 C
1921
11.5 C
+1.20 C
1922
10.5 C
+0.19 C
1923
10.0 C
-0.30 C
1924
9.3 C
-1.02 C
1926
10.9 C
+0.60 C
1927
10.5 C
+0.25 C
1928
10.4 C
+0.11 C
1929
9.1 C
-1.22 C
1930
9.0 C
-1.32 C
1931
9.9 C
-0.36 C
1932
9.7 C
-0.60 C
1933
9.9 C
-0.36 C
1934
12.5 C
+2.18 C
1935
10.9 C
+0.65 C
1936
11.2 C
+0.95 C
1937
10.7 C
+0.45 C
1939
10.8 C
+0.55 C
1940
11.5 C
+1.23 C
1941
10.9 C
+0.63 C
1942
10.6 C
+0.37 C
1943
11.6 C
+1.32 C
1944
10.8 C
+0.49 C
1945
10.6 C
+0.33 C
1946
11.0 C
+0.72 C
1947
10.9 C
+0.64 C
1948
10.1 C
-0.18 C
1949
10.3 C
+0.05 C
1950
11.0 C
+0.77 C
1951
9.7 C
-0.57 C
1952
10.0 C
-0.31 C
1953
10.0 C
-0.31 C
1954
11.0 C
+0.76 C
1955
10.1 C
-0.20 C
1956
9.9 C
-0.34 C
1957
9.6 C
-0.65 C
1958
10.6 C
+0.35 C
1959
10.6 C
+0.37 C
1960
10.1 C
-0.13 C
1961
10.0 C
-0.32 C
1962
10.4 C
+0.16 C
1963
10.5 C
+0.26 C
1964
9.3 C
-0.93 C
1965
10.2 C
-0.12 C
1966
10.6 C
+0.29 C
1967
10.3 C
-0.02 C
1968
9.0 C
-1.26 C
1969
10.0 C
-0.28 C
1970
9.9 C
-0.34 C
1971
9.6 C
-0.68 C
1974
9.2 C
-1.03 C
1977
11.0 C
+0.70 C
1980
11.3 C
+1.02 C
1981
12.1 C
+1.78 C
1982
10.6 C
+0.34 C
1983
11.0 C
+0.68 C
1990
10.3 C
+0.03 C
1991
9.1 C
-1.16 C
1993
9.1 C
-1.16 C
1994
10.3 C
+0.02 C
1995
11.2 C
+0.90 C
1996
11.1 C
+0.87 C
1999
10.6 C
+0.28 C
The fitted trend in annual mean temperature here over 1893 to 1999 is 0.04 C (-0.02 to 0.10) per decade. The interval includes zero, so the trend is not clearly different from zero. In Fahrenheit: 0.08 F (-0.03 to 0.18) per decade. The slope is a straight line fitted to 81 complete years; the brackets give its 95 percent interval.
Fitted temperature trends per decade at Delta
Measure
Per decade (C)
Per decade (F)
Period
Complete years
Reading
Annual mean temperature
0.04 C (-0.02 to 0.10) per decade
0.08 F (-0.03 to 0.18) per decade
1893 to 1999
81
Not clearly different from zero
Mean daily maximum
-0.02 C (-0.10 to 0.05) per decade
-0.05 F (-0.18 to 0.09) per decade
1893 to 1999
81
Not clearly different from zero
Mean daily minimum
0.11 C (0.04 to 0.18) per decade
0.2 F (0.1 to 0.3) per decade
1893 to 1999
81
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
1893 to 1999
Yearly extremes at Delta: 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)
1900
38.3 C (100.9 F)
106
Coldest night (TNn)
-37.8 C (-36.0 F)
1913
-22.2 C (-8.0 F)
106
Wettest day (Rx1day)
63.5 mm (2.5 in)
1893
19.7 mm (0.8 in)
106
Wettest five days (Rx5day)
114.3 mm (4.5 in)
1893
27.6 mm (1.1 in)
106
Longest dry spell (CDD)
93 days
1972
42 days
106
Hottest day (TXx)
The hottest day of the year at Delta, 1893 to 1999. The record is 42.8 C (109.0 F) in 1900, marked on the chart; the median year is 38.3 C (100.9 F).
Hottest day (TXx) at Delta by year
Year
Hottest day (TXx)
1893
39.4 C (102.9 F)
1894
41.1 C (106.0 F)
1895
38.3 C (100.9 F)
1896
42.2 C (108.0 F)
1897
40.0 C (104.0 F)
1898
41.7 C (107.1 F)
1899
38.9 C (102.0 F)
1900
42.8 C (109.0 F)
1901
42.2 C (108.0 F)
1902
39.4 C (102.9 F)
1903
8.3 C (46.9 F)
1904
37.2 C (99.0 F)
1905
37.8 C (100.0 F)
1906
37.2 C (99.0 F)
1907
37.8 C (100.0 F)
1908
37.2 C (99.0 F)
1909
38.3 C (100.9 F)
1910
38.3 C (100.9 F)
1911
36.7 C (98.1 F)
1912
37.8 C (100.0 F)
1913
39.4 C (102.9 F)
1914
36.7 C (98.1 F)
1915
37.2 C (99.0 F)
1916
36.7 C (98.1 F)
1917
37.8 C (100.0 F)
1918
38.9 C (102.0 F)
1919
36.7 C (98.1 F)
1920
36.7 C (98.1 F)
1921
37.2 C (99.0 F)
1922
38.3 C (100.9 F)
1923
35.6 C (96.1 F)
1924
36.1 C (97.0 F)
1925
39.4 C (102.9 F)
1926
37.8 C (100.0 F)
1927
37.8 C (100.0 F)
1928
36.7 C (98.1 F)
1929
37.8 C (100.0 F)
1930
37.2 C (99.0 F)
1931
40.0 C (104.0 F)
1932
37.2 C (99.0 F)
1933
38.3 C (100.9 F)
1934
39.4 C (102.9 F)
1935
38.3 C (100.9 F)
1936
39.4 C (102.9 F)
1937
38.9 C (102.0 F)
1938
38.3 C (100.9 F)
1939
40.0 C (104.0 F)
1940
40.6 C (105.1 F)
1941
38.3 C (100.9 F)
1942
40.0 C (104.0 F)
1943
39.4 C (102.9 F)
1944
38.9 C (102.0 F)
1945
38.9 C (102.0 F)
1946
38.3 C (100.9 F)
1947
39.4 C (102.9 F)
1948
38.3 C (100.9 F)
1949
38.9 C (102.0 F)
1950
39.4 C (102.9 F)
1951
37.8 C (100.0 F)
1952
38.3 C (100.9 F)
1953
38.9 C (102.0 F)
1954
41.1 C (106.0 F)
1955
38.3 C (100.9 F)
1956
37.2 C (99.0 F)
1957
37.2 C (99.0 F)
1958
38.9 C (102.0 F)
1959
37.8 C (100.0 F)
1960
38.9 C (102.0 F)
1961
37.8 C (100.0 F)
1962
37.2 C (99.0 F)
1963
37.8 C (100.0 F)
1964
38.3 C (100.9 F)
1965
37.2 C (99.0 F)
1966
37.2 C (99.0 F)
1967
35.6 C (96.1 F)
1968
36.7 C (98.1 F)
1969
38.3 C (100.9 F)
1970
39.4 C (102.9 F)
1971
38.9 C (102.0 F)
1972
40.0 C (104.0 F)
1974
38.3 C (100.9 F)
1975
36.7 C (98.1 F)
1976
26.7 C (80.1 F)
1977
37.8 C (100.0 F)
1978
38.9 C (102.0 F)
1979
39.4 C (102.9 F)
1980
38.3 C (100.9 F)
1981
40.0 C (104.0 F)
1982
40.0 C (104.0 F)
1983
36.7 C (98.1 F)
1984
36.7 C (98.1 F)
1985
38.3 C (100.9 F)
1986
37.8 C (100.0 F)
1987
36.1 C (97.0 F)
1988
12.8 C (55.0 F)
1989
40.6 C (105.1 F)
1990
41.1 C (106.0 F)
1991
37.2 C (99.0 F)
1992
36.7 C (98.1 F)
1993
35.6 C (96.1 F)
1994
39.4 C (102.9 F)
1995
37.2 C (99.0 F)
1996
37.8 C (100.0 F)
1997
36.7 C (98.1 F)
1998
38.3 C (100.9 F)
1999
37.2 C (99.0 F)
Coldest night (TNn)
The coldest night of the year at Delta, 1893 to 1999. The record is -37.8 C (-36.0 F) in 1913, marked on the chart; the median year is -22.2 C (-8.0 F).
Coldest night (TNn) at Delta by year
Year
Coldest night (TNn)
1893
-23.3 C (-9.9 F)
1894
-25.6 C (-14.1 F)
1895
-25.6 C (-14.1 F)
1896
-20.6 C (-5.1 F)
1897
-21.1 C (-6.0 F)
1898
-28.9 C (-20.0 F)
1899
-21.7 C (-7.1 F)
1900
-19.4 C (-2.9 F)
1901
-23.3 C (-9.9 F)
1902
-28.9 C (-20.0 F)
1903
-27.8 C (-18.0 F)
1904
-11.7 C (10.9 F)
1905
-21.1 C (-6.0 F)
1906
-24.4 C (-11.9 F)
1907
-17.2 C (1.0 F)
1908
-16.7 C (1.9 F)
1909
-31.1 C (-24.0 F)
1910
-23.9 C (-11.0 F)
1911
-30.0 C (-22.0 F)
1912
-21.7 C (-7.1 F)
1913
-37.8 C (-36.0 F)
1914
-24.4 C (-11.9 F)
1915
-26.7 C (-16.1 F)
1916
-20.6 C (-5.1 F)
1917
-25.0 C (-13.0 F)
1918
-28.9 C (-20.0 F)
1919
-26.7 C (-16.1 F)
1920
-23.9 C (-11.0 F)
1921
-17.8 C (0.0 F)
1922
-23.3 C (-9.9 F)
1923
-18.3 C (-0.9 F)
1924
-31.1 C (-24.0 F)
1925
-29.4 C (-20.9 F)
1926
-20.6 C (-5.1 F)
1927
-20.0 C (-4.0 F)
1928
-17.8 C (0.0 F)
1929
-26.1 C (-15.0 F)
1930
-28.9 C (-20.0 F)
1931
-23.9 C (-11.0 F)
1932
-23.9 C (-11.0 F)
1933
-28.3 C (-18.9 F)
1934
-14.4 C (6.1 F)
1935
-18.9 C (-2.0 F)
1936
-16.1 C (3.0 F)
1937
-23.9 C (-11.0 F)
1938
-17.8 C (0.0 F)
1939
-20.6 C (-5.1 F)
1940
-21.1 C (-6.0 F)
1941
-13.9 C (7.0 F)
1942
-25.6 C (-14.1 F)
1943
-22.2 C (-8.0 F)
1944
-17.2 C (1.0 F)
1945
-23.9 C (-11.0 F)
1946
-22.2 C (-8.0 F)
1947
-21.7 C (-7.1 F)
1948
-31.1 C (-24.0 F)
1949
-26.7 C (-16.1 F)
1950
-22.8 C (-9.0 F)
1951
-32.8 C (-27.0 F)
1952
-23.3 C (-9.9 F)
1953
-19.4 C (-2.9 F)
1954
-21.7 C (-7.1 F)
1955
-21.7 C (-7.1 F)
1956
-25.0 C (-13.0 F)
1957
-21.7 C (-7.1 F)
1958
-20.6 C (-5.1 F)
1959
-20.6 C (-5.1 F)
1960
-20.6 C (-5.1 F)
1961
-25.6 C (-14.1 F)
1962
-22.2 C (-8.0 F)
1963
-31.7 C (-25.1 F)
1964
-23.3 C (-9.9 F)
1965
-18.9 C (-2.0 F)
1966
-22.2 C (-8.0 F)
1967
-22.2 C (-8.0 F)
1968
-25.6 C (-14.1 F)
1969
-17.8 C (0.0 F)
1970
-22.8 C (-9.0 F)
1971
-32.8 C (-27.0 F)
1972
-18.9 C (-2.0 F)
1974
-26.1 C (-15.0 F)
1975
-27.2 C (-17.0 F)
1976
-25.0 C (-13.0 F)
1977
-23.3 C (-9.9 F)
1978
-11.7 C (10.9 F)
1979
-28.3 C (-18.9 F)
1980
-12.2 C (10.0 F)
1981
-15.0 C (5.0 F)
1982
-18.9 C (-2.0 F)
1983
-17.8 C (0.0 F)
1984
-25.0 C (-13.0 F)
1985
-23.9 C (-11.0 F)
1986
-13.9 C (7.0 F)
1987
-21.7 C (-7.1 F)
1988
-21.7 C (-7.1 F)
1989
-22.2 C (-8.0 F)
1990
-27.2 C (-17.0 F)
1991
-23.3 C (-9.9 F)
1992
-20.6 C (-5.1 F)
1993
-19.4 C (-2.9 F)
1994
-18.9 C (-2.0 F)
1995
-15.0 C (5.0 F)
1996
-17.2 C (1.0 F)
1997
-15.0 C (5.0 F)
1998
-26.1 C (-15.0 F)
1999
-16.1 C (3.0 F)
Wettest day (Rx1day)
The wettest day of the year at Delta, 1893 to 1999. The record is 63.5 mm (2.5 in) in 1893, marked on the chart; the median year is 19.7 mm (0.8 in).
Wettest day (Rx1day) at Delta by year
Year
Wettest day (Rx1day)
1893
63.5 mm (2.5 in)
1894
27.9 mm (1.1 in)
1895
16.5 mm (0.6 in)
1896
20.3 mm (0.8 in)
1897
27.9 mm (1.1 in)
1898
14.0 mm (0.6 in)
1899
20.3 mm (0.8 in)
1900
7.6 mm (0.30 in)
1901
9.1 mm (0.36 in)
1902
17.8 mm (0.7 in)
1903
2.5 mm (0.10 in)
1904
3.0 mm (0.12 in)
1905
11.9 mm (0.5 in)
1906
47.0 mm (1.9 in)
1907
16.8 mm (0.7 in)
1908
27.2 mm (1.1 in)
1909
21.1 mm (0.8 in)
1910
19.6 mm (0.8 in)
1911
31.8 mm (1.3 in)
1912
27.9 mm (1.1 in)
1913
21.6 mm (0.9 in)
1914
35.1 mm (1.4 in)
1915
20.6 mm (0.8 in)
1916
20.8 mm (0.8 in)
1917
15.7 mm (0.6 in)
1918
13.5 mm (0.5 in)
1919
41.9 mm (1.6 in)
1920
21.3 mm (0.8 in)
1921
20.8 mm (0.8 in)
1922
14.0 mm (0.6 in)
1923
22.4 mm (0.9 in)
1924
13.2 mm (0.5 in)
1925
15.7 mm (0.6 in)
1926
10.7 mm (0.4 in)
1927
21.6 mm (0.9 in)
1928
16.3 mm (0.6 in)
1929
16.5 mm (0.6 in)
1930
23.1 mm (0.9 in)
1931
19.8 mm (0.8 in)
1932
24.1 mm (0.9 in)
1933
20.3 mm (0.8 in)
1934
19.6 mm (0.8 in)
1935
13.2 mm (0.5 in)
1936
14.5 mm (0.6 in)
1937
24.1 mm (0.9 in)
1938
15.2 mm (0.6 in)
1939
9.7 mm (0.38 in)
1940
26.2 mm (1.0 in)
1941
28.2 mm (1.1 in)
1942
14.2 mm (0.6 in)
1943
35.3 mm (1.4 in)
1944
17.3 mm (0.7 in)
1945
17.8 mm (0.7 in)
1946
28.2 mm (1.1 in)
1947
28.4 mm (1.1 in)
1948
26.2 mm (1.0 in)
1949
13.2 mm (0.5 in)
1950
15.2 mm (0.6 in)
1951
17.3 mm (0.7 in)
1952
23.1 mm (0.9 in)
1953
32.8 mm (1.3 in)
1954
15.7 mm (0.6 in)
1955
13.7 mm (0.5 in)
1956
8.6 mm (0.34 in)
1957
40.6 mm (1.6 in)
1958
14.7 mm (0.6 in)
1959
20.1 mm (0.8 in)
1960
14.5 mm (0.6 in)
1961
25.4 mm (1.0 in)
1962
17.8 mm (0.7 in)
1963
23.4 mm (0.9 in)
1964
36.1 mm (1.4 in)
1965
20.8 mm (0.8 in)
1966
14.0 mm (0.6 in)
1967
21.8 mm (0.9 in)
1968
12.7 mm (0.5 in)
1969
32.3 mm (1.3 in)
1970
20.3 mm (0.8 in)
1971
21.1 mm (0.8 in)
1972
10.2 mm (0.4 in)
1974
12.7 mm (0.5 in)
1975
7.6 mm (0.30 in)
1976
6.9 mm (0.27 in)
1977
16.5 mm (0.6 in)
1978
16.5 mm (0.6 in)
1979
19.1 mm (0.8 in)
1980
13.2 mm (0.5 in)
1981
24.6 mm (1.0 in)
1982
24.9 mm (1.0 in)
1983
13.5 mm (0.5 in)
1984
12.2 mm (0.5 in)
1985
21.1 mm (0.8 in)
1986
26.7 mm (1.1 in)
1987
14.5 mm (0.6 in)
1988
8.9 mm (0.35 in)
1989
15.5 mm (0.6 in)
1990
13.2 mm (0.5 in)
1991
17.8 mm (0.7 in)
1992
63.5 mm (2.5 in)
1993
24.4 mm (1.0 in)
1994
18.3 mm (0.7 in)
1995
37.6 mm (1.5 in)
1996
21.1 mm (0.8 in)
1997
20.3 mm (0.8 in)
1998
24.9 mm (1.0 in)
1999
22.1 mm (0.9 in)
Wettest five days (Rx5day)
The wettest five days of the year at Delta, 1893 to 1999. The record is 114.3 mm (4.5 in) in 1893, marked on the chart; the median year is 27.6 mm (1.1 in).
Wettest five days (Rx5day) at Delta by year
Year
Wettest five days (Rx5day)
1893
114.3 mm (4.5 in)
1894
27.9 mm (1.1 in)
1895
21.6 mm (0.9 in)
1896
38.1 mm (1.5 in)
1897
40.6 mm (1.6 in)
1898
21.1 mm (0.8 in)
1899
26.7 mm (1.1 in)
1900
13.2 mm (0.5 in)
1901
11.2 mm (0.4 in)
1902
22.8 mm (0.9 in)
1903
3.0 mm (0.12 in)
1904
5.0 mm (0.20 in)
1905
22.1 mm (0.9 in)
1906
52.1 mm (2.1 in)
1907
27.2 mm (1.1 in)
1908
47.8 mm (1.9 in)
1909
34.7 mm (1.4 in)
1910
33.0 mm (1.3 in)
1911
51.9 mm (2.0 in)
1912
58.3 mm (2.3 in)
1913
40.7 mm (1.6 in)
1914
49.1 mm (1.9 in)
1915
26.8 mm (1.1 in)
1916
46.8 mm (1.8 in)
1917
43.1 mm (1.7 in)
1918
24.7 mm (1.0 in)
1919
81.5 mm (3.2 in)
1920
32.7 mm (1.3 in)
1921
25.9 mm (1.0 in)
1922
15.8 mm (0.6 in)
1923
35.5 mm (1.4 in)
1924
30.7 mm (1.2 in)
1925
30.4 mm (1.2 in)
1926
19.3 mm (0.8 in)
1927
30.2 mm (1.2 in)
1928
28.1 mm (1.1 in)
1929
57.7 mm (2.3 in)
1930
26.7 mm (1.1 in)
1931
26.7 mm (1.1 in)
1932
25.1 mm (1.0 in)
1933
26.1 mm (1.0 in)
1934
23.9 mm (0.9 in)
1935
17.8 mm (0.7 in)
1936
18.5 mm (0.7 in)
1937
31.5 mm (1.2 in)
1938
24.6 mm (1.0 in)
1939
20.8 mm (0.8 in)
1940
38.1 mm (1.5 in)
1941
36.3 mm (1.4 in)
1942
18.3 mm (0.7 in)
1943
36.8 mm (1.4 in)
1944
30.5 mm (1.2 in)
1945
23.6 mm (0.9 in)
1946
31.8 mm (1.3 in)
1947
42.9 mm (1.7 in)
1948
40.2 mm (1.6 in)
1949
16.8 mm (0.7 in)
1950
21.5 mm (0.8 in)
1951
17.3 mm (0.7 in)
1952
45.5 mm (1.8 in)
1953
42.7 mm (1.7 in)
1954
28.0 mm (1.1 in)
1955
16.7 mm (0.7 in)
1956
15.5 mm (0.6 in)
1957
52.0 mm (2.0 in)
1958
25.3 mm (1.0 in)
1959
33.0 mm (1.3 in)
1960
24.7 mm (1.0 in)
1961
26.1 mm (1.0 in)
1962
26.2 mm (1.0 in)
1963
25.0 mm (1.0 in)
1964
50.1 mm (2.0 in)
1965
40.3 mm (1.6 in)
1966
17.6 mm (0.7 in)
1967
26.9 mm (1.1 in)
1968
26.4 mm (1.0 in)
1969
36.6 mm (1.4 in)
1970
52.8 mm (2.1 in)
1971
36.1 mm (1.4 in)
1972
18.1 mm (0.7 in)
1974
21.1 mm (0.8 in)
1975
8.4 mm (0.33 in)
1976
7.7 mm (0.30 in)
1977
22.8 mm (0.9 in)
1978
18.8 mm (0.7 in)
1979
24.7 mm (1.0 in)
1980
32.9 mm (1.3 in)
1981
39.4 mm (1.6 in)
1982
47.7 mm (1.9 in)
1983
23.9 mm (0.9 in)
1984
22.8 mm (0.9 in)
1985
30.9 mm (1.2 in)
1986
38.9 mm (1.5 in)
1987
24.4 mm (1.0 in)
1988
12.5 mm (0.5 in)
1989
18.0 mm (0.7 in)
1990
23.4 mm (0.9 in)
1991
40.0 mm (1.6 in)
1992
63.5 mm (2.5 in)
1993
24.7 mm (1.0 in)
1994
30.5 mm (1.2 in)
1995
43.2 mm (1.7 in)
1996
29.4 mm (1.2 in)
1997
31.2 mm (1.2 in)
1998
49.0 mm (1.9 in)
1999
28.7 mm (1.1 in)
Longest dry spell (CDD)
The longest dry spell of the year at Delta, 1893 to 1999. The record is 93 days in 1972, marked on the chart; the median year is 42 days.
Longest dry spell (CDD) at Delta by year
Year
Longest dry spell (CDD)
1893
87 days
1894
59 days
1895
46 days
1896
73 days
1897
26 days
1898
43 days
1899
28 days
1900
44 days
1901
36 days
1902
32 days
1903
26 days
1904
42 days
1905
51 days
1906
62 days
1907
27 days
1908
32 days
1909
43 days
1910
90 days
1911
62 days
1912
36 days
1913
80 days
1914
57 days
1915
62 days
1916
56 days
1917
54 days
1918
65 days
1919
36 days
1920
34 days
1921
27 days
1922
46 days
1923
26 days
1924
48 days
1925
28 days
1926
35 days
1927
46 days
1928
34 days
1929
59 days
1930
41 days
1931
31 days
1932
57 days
1933
33 days
1934
38 days
1935
58 days
1936
44 days
1937
30 days
1938
26 days
1939
47 days
1940
31 days
1941
25 days
1942
47 days
1943
27 days
1944
59 days
1945
57 days
1946
33 days
1947
39 days
1948
28 days
1949
37 days
1950
82 days
1951
56 days
1952
61 days
1953
43 days
1954
72 days
1955
40 days
1956
43 days
1957
42 days
1958
34 days
1959
35 days
1960
49 days
1961
88 days
1962
30 days
1963
29 days
1964
59 days
1965
27 days
1966
43 days
1967
73 days
1968
32 days
1969
28 days
1970
59 days
1971
56 days
1972
93 days
1974
42 days
1975
38 days
1976
61 days
1977
47 days
1978
64 days
1979
36 days
1980
52 days
1981
26 days
1982
57 days
1983
40 days
1984
53 days
1985
33 days
1986
24 days
1987
28 days
1988
19 days
1989
38 days
1990
26 days
1991
70 days
1992
38 days
1993
35 days
1994
47 days
1995
33 days
1996
45 days
1997
35 days
1998
27 days
1999
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
81 years with a frost
Across 81 years with a frost, the median last spring frost at Delta falls on 13 May and the median first autumn frost on 27 September, which leaves a median of 142 days between them.
In 1955 to 1999 the median growing season was 145 days. That is 13 days more than in 1893 to 1932.
Fitted over all years, the growing season changes by +1.6 days per decade at this station.
Frost dates and growing season at Delta
Measure
Median, all years
Earliest period (1893 to 1932)
Recent period (1955 to 1999)
Recent against earliest
Fitted trend
Last spring frost
13 May
17 May
13 May
4 days earlier
-0.9 days per decade
First autumn frost
27 September
24 September
29 September
5 days later
+0.7 days per decade
Growing days
142 days
132 days
145 days
13 days more
+1.6 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
89 years, 1893 to 1999
A day with at least 19.3 mm (0.8 in) of rain is expected about once in 2 years. A day with at least 56.2 mm (2.2 in) of rain is expected about once in 100 years.
Rainfall return levels at Delta: the daily rain expected about once in a given number of years
Expected about once in
A day with at least
Note
2 years
19.3 mm (0.8 in)
5 years
26.9 mm (1.1 in)
10 years
32.8 mm (1.3 in)
25 years
41.3 mm (1.6 in)
50 years
48.4 mm (1.9 in)
100 years
56.2 mm (2.2 in)
Longer than the 89 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, 89 years of values from 1893 to 1999.
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: 63.5 mm (2.5 in) in 1893; 63.5 mm (2.5 in) in 1992; 41.9 mm (1.6 in) in 1919.
Station Changes
No change in the annual mean temperature of this station was found against its neighbours.
Download the Data
Data for Delta standing records by year: CSV or JSON. Field meanings are on the data page.
Data for Delta 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.