Record envelope, standing records and threshold days for Greeley (USC00053546), Colorado, United States, with 75 years of record.
Key Facts for Greeley
Greeley (USC00053546) is a weather station in Colorado, United States at 40.42 latitude and -104.68 longitude, 1,418 m (4,652 ft) above sea level.
The station reports from 1893 to 1967, 75 years of record.
1,464 records set at Greeley still stand.
Records are tracked for tmax, tmin, prcp, snow: an element needs 30 years of data to be eligible.
Greeley set a daily record high maximum temperature of 20.0 C (68.0 F) on 15 February 1967.
About the Station
Location: Colorado, United States, 40.42 latitude, -104.68 longitude.
Elevation: 1,418 m (4,652 ft).
Period of record: 1893 to 1967, 75 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 Greeley. 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 Greeley, with 2026 drawn through them
Month
Highest record high
Lowest record low
2026 highest maximum
2026 lowest minimum
Jan
21.1 C (70.0 F)
-37.8 C (-36.0 F)
n/a
n/a
Feb
25.0 C (77.0 F)
-42.8 C (-45.0 F)
n/a
n/a
Mar
28.9 C (84.0 F)
-32.2 C (-26.0 F)
n/a
n/a
Apr
31.7 C (89.1 F)
-18.9 C (-2.0 F)
n/a
n/a
May
35.6 C (96.1 F)
-7.8 C (18.0 F)
n/a
n/a
Jun
41.1 C (106.0 F)
-2.2 C (28.0 F)
n/a
n/a
Jul
41.7 C (107.1 F)
1.1 C (34.0 F)
n/a
n/a
Aug
40.6 C (105.1 F)
1.7 C (35.1 F)
n/a
n/a
Sep
37.2 C (99.0 F)
-6.7 C (19.9 F)
n/a
n/a
Oct
32.8 C (91.0 F)
-22.2 C (-8.0 F)
n/a
n/a
Nov
27.8 C (82.0 F)
-27.8 C (-18.0 F)
n/a
n/a
Dec
23.9 C (75.0 F)
-38.3 C (-36.9 F)
n/a
n/a
Which Years Hold Standing Records
1,464 standing records
Year with most
1,464 records at Greeley still stand. 1948 holds the most, with 38.
Standing records at Greeley by the year they were set
Year set
Standing records
1893
36
1894
12
1895
22
1896
18
1897
25
1898
23
1899
33
1900
21
1901
18
1902
13
1903
21
1904
17
1905
17
1906
26
1907
15
1908
18
1909
25
1910
25
1911
23
1912
12
1913
14
1914
7
1915
13
1916
20
1917
14
1918
26
1919
29
1920
11
1921
17
1922
11
1923
11
1924
33
1925
18
1926
20
1927
23
1928
13
1929
19
1930
24
1931
23
1932
26
1933
23
1934
31
1935
20
1936
33
1937
26
1938
15
1939
18
1940
15
1941
13
1942
27
1943
20
1944
2
1945
19
1946
27
1947
28
1948
38
1949
9
1950
18
1951
28
1952
22
1953
16
1954
27
1955
26
1956
12
1957
13
1958
10
1959
17
1960
14
1961
10
1962
29
1963
19
1964
17
1965
19
1966
9
1967
2
All-Time Record Progression
3 new records
3 all-time records were set at Greeley between 8 February 1933 and 12 January 1963. Each dot is a new record.
When Greeley set new all-time records
Date
Kind
Detail
1933-02-08
Record low maximum temperature
Record low maximum temperature -22.8 C (-9.0 F)
1936-07-23
Record high maximum temperature
Record high maximum temperature 41.7 C (107.1 F)
1963-01-12
Record low maximum temperature
Record low maximum temperature -23.3 C (-9.9 F)
Wettest Day of Each Month
Jul: 85.6 mm (3.4 in)
The wettest day on record for each calendar month at Greeley. The most was 85.6 mm (3.4 in) on 30 July 1916.
Record daily precipitation for each month at Greeley
Month
Record daily precipitation (mm)
Date
Jan
31.5 mm (1.2 in)
23 January 1921
Feb
20.8 mm (0.8 in)
22 February 1909
Mar
42.9 mm (1.7 in)
24 March 1909
Apr
72.4 mm (2.9 in)
19 April 1920
May
65.5 mm (2.6 in)
23 May 1909
Jun
68.1 mm (2.7 in)
30 June 1962
Jul
85.6 mm (3.4 in)
30 July 1916
Aug
51.6 mm (2.0 in)
19 August 1915
Sep
81.5 mm (3.2 in)
21 September 1902
Oct
50.8 mm (2.0 in)
23 October 1914
Nov
38.1 mm (1.5 in)
16 November 1964
Dec
33.0 mm (1.3 in)
1 December 1913
Period of Record Coverage
1893 to 1967
Complete yearUnder 90 percent of days
75 years of record at Greeley, 1893 to 1967. 13 years have data for under 90 percent of days and are left out of rankings: 1893, 1894, 1895, 1899, 1907, 1914, 1915, 1916 and others.
Cooler than the station meanWarmer than the station mean
One stripe for each of 58 complete years at Greeley, 1896 to 1966. Blue stripes are years cooler than the station's own mean of 9.1 C (48.3 F); red stripes are warmer. The coolest year was 1929, at 7.6 C (45.7 F), and the warmest was 1934, at 11.1 C (52.0 F). The strongest colour marks a difference of 2.1 C (3.8 F).
Annual mean temperature at Greeley as warming stripes, 1896 to 1966
Year
Annual mean temperature
Difference from the station mean
1896
8.6 C
-0.51 C
1897
8.4 C
-0.62 C
1900
9.7 C
+0.66 C
1901
9.3 C
+0.25 C
1902
9.4 C
+0.33 C
1903
8.5 C
-0.59 C
1904
10.1 C
+1.01 C
1905
8.9 C
-0.14 C
1906
9.5 C
+0.43 C
1909
9.0 C
-0.02 C
1910
10.7 C
+1.64 C
1911
9.5 C
+0.47 C
1913
8.6 C
-0.49 C
1918
9.5 C
+0.40 C
1919
8.8 C
-0.29 C
1921
9.1 C
+0.01 C
1922
8.3 C
-0.75 C
1923
8.1 C
-0.97 C
1924
7.7 C
-1.36 C
1925
9.2 C
+0.09 C
1926
9.0 C
-0.06 C
1928
8.5 C
-0.55 C
1929
7.6 C
-1.45 C
1930
8.6 C
-0.42 C
1931
9.6 C
+0.52 C
1932
8.4 C
-0.70 C
1933
9.8 C
+0.77 C
1934
11.1 C
+2.07 C
1935
9.3 C
+0.20 C
1936
9.3 C
+0.25 C
1937
8.6 C
-0.50 C
1938
9.8 C
+0.70 C
1939
10.0 C
+0.94 C
1940
9.2 C
+0.18 C
1941
9.0 C
-0.07 C
1942
8.1 C
-0.96 C
1943
9.7 C
+0.63 C
1944
8.6 C
-0.46 C
1945
8.8 C
-0.25 C
1946
9.8 C
+0.69 C
1947
9.1 C
+0.00 C
1948
9.0 C
-0.05 C
1949
8.7 C
-0.36 C
1950
9.3 C
+0.20 C
1951
8.1 C
-0.97 C
1952
8.7 C
-0.39 C
1953
9.6 C
+0.52 C
1954
10.1 C
+1.06 C
1955
8.1 C
-0.95 C
1956
9.1 C
+0.08 C
1957
8.8 C
-0.22 C
1958
9.3 C
+0.20 C
1959
8.6 C
-0.50 C
1960
8.8 C
-0.27 C
1961
8.5 C
-0.58 C
1962
8.9 C
-0.17 C
1963
9.7 C
+0.68 C
1966
9.4 C
+0.35 C
The fitted trend in annual mean temperature here over 1896 to 1966 is -0.01 C (-0.11 to 0.08) per decade. The interval includes zero, so the trend is not clearly different from zero. In Fahrenheit: -0.03 F (-0.19 to 0.14) per decade. The slope is a straight line fitted to 58 complete years; the brackets give its 95 percent interval.
Fitted temperature trends per decade at Greeley
Measure
Per decade (C)
Per decade (F)
Period
Complete years
Reading
Annual mean temperature
-0.01 C (-0.11 to 0.08) per decade
-0.03 F (-0.19 to 0.14) per decade
1896 to 1966
58
Not clearly different from zero
Mean daily maximum
-0.09 C (-0.23 to 0.05) per decade
-0.2 F (-0.4 to 0.1) per decade
1896 to 1966
58
Not clearly different from zero
Mean daily minimum
0.06 C (-0.02 to 0.15) per decade
0.12 F (-0.04 to 0.27) per decade
1896 to 1966
58
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
1893 to 1967
Yearly extremes at Greeley: the record and the median year
Measure
Record
Year of the record
Median year
Years with a value
Hottest day (TXx)
41.7 C (107.1 F)
1936
37.2 C (99.0 F)
75
Coldest night (TNn)
-42.8 C (-45.0 F)
1899
-27.8 C (-18.0 F)
75
Wettest day (Rx1day)
85.6 mm (3.4 in)
1916
31.0 mm (1.2 in)
75
Wettest five days (Rx5day)
120.9 mm (4.8 in)
1913
55.1 mm (2.2 in)
75
Longest dry spell (CDD)
96 days
1934
39 days
75
Hottest day (TXx)
The hottest day of the year at Greeley, 1893 to 1967. The record is 41.7 C (107.1 F) in 1936, marked on the chart; the median year is 37.2 C (99.0 F).
Hottest day (TXx) at Greeley by year
Year
Hottest day (TXx)
1893
36.7 C (98.1 F)
1894
28.9 C (84.0 F)
1895
35.6 C (96.1 F)
1896
34.4 C (93.9 F)
1897
35.0 C (95.0 F)
1898
37.2 C (99.0 F)
1899
35.6 C (96.1 F)
1900
36.7 C (98.1 F)
1901
37.8 C (100.0 F)
1902
39.4 C (102.9 F)
1903
37.2 C (99.0 F)
1904
35.6 C (96.1 F)
1905
36.1 C (97.0 F)
1906
35.0 C (95.0 F)
1907
33.3 C (91.9 F)
1908
36.7 C (98.1 F)
1909
36.7 C (98.1 F)
1910
38.3 C (100.9 F)
1911
36.7 C (98.1 F)
1912
36.7 C (98.1 F)
1913
37.8 C (100.0 F)
1914
33.9 C (93.0 F)
1915
37.2 C (99.0 F)
1916
36.1 C (97.0 F)
1917
27.8 C (82.0 F)
1918
39.4 C (102.9 F)
1919
41.1 C (106.0 F)
1920
38.3 C (100.9 F)
1921
36.7 C (98.1 F)
1922
38.3 C (100.9 F)
1923
35.6 C (96.1 F)
1924
36.7 C (98.1 F)
1925
40.0 C (104.0 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
37.8 C (100.0 F)
1931
39.4 C (102.9 F)
1932
37.2 C (99.0 F)
1933
38.9 C (102.0 F)
1934
41.1 C (106.0 F)
1935
40.6 C (105.1 F)
1936
41.7 C (107.1 F)
1937
38.9 C (102.0 F)
1938
40.6 C (105.1 F)
1939
40.6 C (105.1 F)
1940
40.6 C (105.1 F)
1941
37.2 C (99.0 F)
1942
37.2 C (99.0 F)
1943
38.3 C (100.9 F)
1944
38.9 C (102.0 F)
1945
37.2 C (99.0 F)
1946
38.3 C (100.9 F)
1947
37.8 C (100.0 F)
1948
37.8 C (100.0 F)
1949
37.2 C (99.0 F)
1950
35.6 C (96.1 F)
1951
37.8 C (100.0 F)
1952
37.8 C (100.0 F)
1953
38.3 C (100.9 F)
1954
41.1 C (106.0 F)
1955
37.8 C (100.0 F)
1956
37.8 C (100.0 F)
1957
37.2 C (99.0 F)
1958
36.1 C (97.0 F)
1959
36.7 C (98.1 F)
1960
37.2 C (99.0 F)
1961
36.1 C (97.0 F)
1962
36.7 C (98.1 F)
1963
37.2 C (99.0 F)
1964
37.8 C (100.0 F)
1965
36.7 C (98.1 F)
1966
37.8 C (100.0 F)
1967
20.0 C (68.0 F)
Coldest night (TNn)
The coldest night of the year at Greeley, 1893 to 1967. The record is -42.8 C (-45.0 F) in 1899, marked on the chart; the median year is -27.8 C (-18.0 F).
Coldest night (TNn) at Greeley by year
Year
Coldest night (TNn)
1893
-23.9 C (-11.0 F)
1894
-26.7 C (-16.1 F)
1895
-23.3 C (-9.9 F)
1896
-26.1 C (-15.0 F)
1897
-30.6 C (-23.1 F)
1898
-30.6 C (-23.1 F)
1899
-42.8 C (-45.0 F)
1900
-29.4 C (-20.9 F)
1901
-33.3 C (-27.9 F)
1902
-31.1 C (-24.0 F)
1903
-30.0 C (-22.0 F)
1904
-20.6 C (-5.1 F)
1905
-33.3 C (-27.9 F)
1906
-26.7 C (-16.1 F)
1907
-16.7 C (1.9 F)
1908
-23.9 C (-11.0 F)
1909
-26.7 C (-16.1 F)
1910
-27.2 C (-17.0 F)
1911
-27.8 C (-18.0 F)
1912
-25.6 C (-14.1 F)
1913
-33.9 C (-29.0 F)
1914
-25.0 C (-13.0 F)
1915
-27.8 C (-18.0 F)
1916
-28.3 C (-18.9 F)
1917
-25.0 C (-13.0 F)
1918
-28.9 C (-20.0 F)
1919
-38.3 C (-36.9 F)
1920
-26.1 C (-15.0 F)
1921
-25.0 C (-13.0 F)
1922
-30.0 C (-22.0 F)
1923
-29.4 C (-20.9 F)
1924
-34.4 C (-29.9 F)
1925
-26.1 C (-15.0 F)
1926
-29.4 C (-20.9 F)
1927
-27.2 C (-17.0 F)
1928
-28.3 C (-18.9 F)
1929
-28.3 C (-18.9 F)
1930
-33.3 C (-27.9 F)
1931
-21.1 C (-6.0 F)
1932
-34.4 C (-29.9 F)
1933
-35.0 C (-31.0 F)
1934
-20.0 C (-4.0 F)
1935
-33.3 C (-27.9 F)
1936
-38.3 C (-36.9 F)
1937
-33.9 C (-29.0 F)
1938
-24.4 C (-11.9 F)
1939
-23.3 C (-9.9 F)
1940
-31.1 C (-24.0 F)
1941
-27.8 C (-18.0 F)
1942
-37.8 C (-36.0 F)
1943
-27.2 C (-17.0 F)
1944
-25.6 C (-14.1 F)
1945
-25.0 C (-13.0 F)
1946
-23.3 C (-9.9 F)
1947
-25.0 C (-13.0 F)
1948
-35.0 C (-31.0 F)
1949
-28.3 C (-18.9 F)
1950
-30.6 C (-23.1 F)
1951
-39.4 C (-38.9 F)
1952
-27.8 C (-18.0 F)
1953
-28.3 C (-18.9 F)
1954
-28.3 C (-18.9 F)
1955
-27.2 C (-17.0 F)
1956
-27.2 C (-17.0 F)
1957
-25.0 C (-13.0 F)
1958
-22.8 C (-9.0 F)
1959
-30.0 C (-22.0 F)
1960
-27.8 C (-18.0 F)
1961
-26.7 C (-16.1 F)
1962
-34.4 C (-29.9 F)
1963
-33.3 C (-27.9 F)
1964
-25.6 C (-14.1 F)
1965
-20.6 C (-5.1 F)
1966
-24.4 C (-11.9 F)
1967
-18.3 C (-0.9 F)
Wettest day (Rx1day)
The wettest day of the year at Greeley, 1893 to 1967. The record is 85.6 mm (3.4 in) in 1916, marked on the chart; the median year is 31.0 mm (1.2 in).
Wettest day (Rx1day) at Greeley by year
Year
Wettest day (Rx1day)
1893
19.8 mm (0.8 in)
1894
24.6 mm (1.0 in)
1895
36.8 mm (1.4 in)
1896
59.7 mm (2.4 in)
1897
33.5 mm (1.3 in)
1898
30.5 mm (1.2 in)
1899
19.8 mm (0.8 in)
1900
40.1 mm (1.6 in)
1901
26.9 mm (1.1 in)
1902
81.5 mm (3.2 in)
1903
20.3 mm (0.8 in)
1904
35.6 mm (1.4 in)
1905
35.1 mm (1.4 in)
1906
31.0 mm (1.2 in)
1907
11.7 mm (0.5 in)
1908
55.4 mm (2.2 in)
1909
66.0 mm (2.6 in)
1910
32.3 mm (1.3 in)
1911
49.3 mm (1.9 in)
1912
30.7 mm (1.2 in)
1913
52.1 mm (2.1 in)
1914
50.8 mm (2.0 in)
1915
51.6 mm (2.0 in)
1916
85.6 mm (3.4 in)
1917
5.1 mm (0.20 in)
1918
29.5 mm (1.2 in)
1919
57.2 mm (2.3 in)
1920
72.4 mm (2.9 in)
1921
38.1 mm (1.5 in)
1922
31.2 mm (1.2 in)
1923
55.9 mm (2.2 in)
1924
31.0 mm (1.2 in)
1925
36.3 mm (1.4 in)
1926
22.9 mm (0.9 in)
1927
29.2 mm (1.1 in)
1928
40.6 mm (1.6 in)
1929
31.2 mm (1.2 in)
1930
35.6 mm (1.4 in)
1931
17.8 mm (0.7 in)
1932
76.2 mm (3.0 in)
1933
29.5 mm (1.2 in)
1934
29.0 mm (1.1 in)
1935
34.0 mm (1.3 in)
1936
55.1 mm (2.2 in)
1937
25.9 mm (1.0 in)
1938
32.8 mm (1.3 in)
1939
19.1 mm (0.8 in)
1940
30.2 mm (1.2 in)
1941
25.1 mm (1.0 in)
1942
29.2 mm (1.1 in)
1943
25.4 mm (1.0 in)
1944
40.9 mm (1.6 in)
1945
28.2 mm (1.1 in)
1946
22.6 mm (0.9 in)
1947
44.7 mm (1.8 in)
1948
13.2 mm (0.5 in)
1949
25.9 mm (1.0 in)
1950
26.4 mm (1.0 in)
1951
28.7 mm (1.1 in)
1952
21.8 mm (0.9 in)
1953
16.8 mm (0.7 in)
1954
20.1 mm (0.8 in)
1955
24.6 mm (1.0 in)
1956
20.1 mm (0.8 in)
1957
38.1 mm (1.5 in)
1958
26.2 mm (1.0 in)
1959
23.9 mm (0.9 in)
1960
23.9 mm (0.9 in)
1961
34.3 mm (1.4 in)
1962
68.1 mm (2.7 in)
1963
50.0 mm (2.0 in)
1964
45.7 mm (1.8 in)
1965
27.4 mm (1.1 in)
1966
47.0 mm (1.9 in)
1967
7.4 mm (0.29 in)
Wettest five days (Rx5day)
The wettest five days of the year at Greeley, 1893 to 1967. The record is 120.9 mm (4.8 in) in 1913, marked on the chart; the median year is 55.1 mm (2.2 in).
Wettest five days (Rx5day) at Greeley by year
Year
Wettest five days (Rx5day)
1893
19.8 mm (0.8 in)
1894
24.6 mm (1.0 in)
1895
77.9 mm (3.1 in)
1896
71.7 mm (2.8 in)
1897
66.5 mm (2.6 in)
1898
67.3 mm (2.6 in)
1899
24.7 mm (1.0 in)
1900
65.5 mm (2.6 in)
1901
46.7 mm (1.8 in)
1902
98.2 mm (3.9 in)
1903
33.5 mm (1.3 in)
1904
67.3 mm (2.6 in)
1905
71.9 mm (2.8 in)
1906
43.2 mm (1.7 in)
1907
12.7 mm (0.5 in)
1908
68.1 mm (2.7 in)
1909
119.4 mm (4.7 in)
1910
40.6 mm (1.6 in)
1911
63.8 mm (2.5 in)
1912
58.0 mm (2.3 in)
1913
120.9 mm (4.8 in)
1914
66.6 mm (2.6 in)
1915
79.4 mm (3.1 in)
1916
54.4 mm (2.1 in)
1917
9.9 mm (0.39 in)
1918
48.8 mm (1.9 in)
1919
71.7 mm (2.8 in)
1920
72.4 mm (2.9 in)
1921
47.2 mm (1.9 in)
1922
38.1 mm (1.5 in)
1923
66.9 mm (2.6 in)
1924
58.6 mm (2.3 in)
1925
81.2 mm (3.2 in)
1926
38.4 mm (1.5 in)
1927
49.6 mm (2.0 in)
1928
74.6 mm (2.9 in)
1929
76.4 mm (3.0 in)
1930
96.5 mm (3.8 in)
1931
25.6 mm (1.0 in)
1932
78.0 mm (3.1 in)
1933
56.4 mm (2.2 in)
1934
41.4 mm (1.6 in)
1935
73.6 mm (2.9 in)
1936
55.6 mm (2.2 in)
1937
38.4 mm (1.5 in)
1938
60.7 mm (2.4 in)
1939
19.1 mm (0.8 in)
1940
33.5 mm (1.3 in)
1941
40.2 mm (1.6 in)
1942
59.1 mm (2.3 in)
1943
65.5 mm (2.6 in)
1944
52.6 mm (2.1 in)
1945
68.4 mm (2.7 in)
1946
35.9 mm (1.4 in)
1947
54.9 mm (2.2 in)
1948
28.0 mm (1.1 in)
1949
55.3 mm (2.2 in)
1950
47.1 mm (1.9 in)
1951
54.0 mm (2.1 in)
1952
40.9 mm (1.6 in)
1953
34.6 mm (1.4 in)
1954
20.6 mm (0.8 in)
1955
31.5 mm (1.2 in)
1956
27.2 mm (1.1 in)
1957
62.1 mm (2.4 in)
1958
38.6 mm (1.5 in)
1959
43.0 mm (1.7 in)
1960
50.6 mm (2.0 in)
1961
64.5 mm (2.5 in)
1962
81.3 mm (3.2 in)
1963
55.1 mm (2.2 in)
1964
52.8 mm (2.1 in)
1965
73.2 mm (2.9 in)
1966
83.8 mm (3.3 in)
1967
7.4 mm (0.29 in)
Longest dry spell (CDD)
The longest dry spell of the year at Greeley, 1893 to 1967. The record is 96 days in 1934, marked on the chart; the median year is 39 days.
Longest dry spell (CDD) at Greeley by year
Year
Longest dry spell (CDD)
1893
40 days
1894
47 days
1895
37 days
1896
39 days
1897
29 days
1898
38 days
1899
43 days
1900
46 days
1901
48 days
1902
39 days
1903
45 days
1904
48 days
1905
62 days
1906
60 days
1907
30 days
1908
28 days
1909
44 days
1910
46 days
1911
36 days
1912
28 days
1913
53 days
1914
54 days
1915
24 days
1916
38 days
1917
29 days
1918
28 days
1919
31 days
1920
38 days
1921
48 days
1922
59 days
1923
44 days
1924
54 days
1925
36 days
1926
34 days
1927
39 days
1928
56 days
1929
32 days
1930
37 days
1931
42 days
1932
33 days
1933
59 days
1934
96 days
1935
51 days
1936
45 days
1937
51 days
1938
23 days
1939
45 days
1940
30 days
1941
35 days
1942
34 days
1943
65 days
1944
34 days
1945
38 days
1946
52 days
1947
30 days
1948
29 days
1949
49 days
1950
41 days
1951
30 days
1952
36 days
1953
38 days
1954
62 days
1955
28 days
1956
38 days
1957
41 days
1958
33 days
1959
61 days
1960
27 days
1961
57 days
1962
40 days
1963
28 days
1964
44 days
1965
46 days
1966
45 days
1967
39 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
58 years with a frost
Across 58 years with a frost, the median last spring frost at Greeley falls on 11 May and the median first autumn frost on 25 September, which leaves a median of 137 days between them.
Fitted over all years, the growing season changes by +0.8 days per decade at this station.
Frost dates and growing season at Greeley
Measure
Median, all years
Earliest period
Recent period (1935 to 1966)
Recent against earliest
Fitted trend
Last spring frost
11 May
n/a
12 May
n/a
+0.2 days per decade
First autumn frost
25 September
n/a
28 September
n/a
+1.0 days per decade
Growing days
137 days
n/a
140 days
n/a
+0.8 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
67 years, 1893 to 1966
A day with at least 31.5 mm (1.2 in) of rain is expected about once in 2 years. A day with at least 91.7 mm (3.6 in) of rain is expected about once in 100 years.
Rainfall return levels at Greeley: the daily rain expected about once in a given number of years
Expected about once in
A day with at least
Note
2 years
31.5 mm (1.2 in)
5 years
43.6 mm (1.7 in)
10 years
53.0 mm (2.1 in)
25 years
66.7 mm (2.6 in)
50 years
78.5 mm (3.1 in)
100 years
91.7 mm (3.6 in)
Longer than the 67 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, 67 years of values from 1893 to 1966.
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: 81.5 mm (3.2 in) in 1902; 76.2 mm (3.0 in) in 1932; 68.1 mm (2.7 in) in 1962.
Station Changes
1 suspected
One change was suspected in the annual mean temperature of Greeley, at 1952. Each is measured against neighbouring stations.
Relative to 5 neighbouring stations, the station's annual mean temperature from 1952 ran 0.3 C (0.5 F) lower than in the years before (likely change).
Suspected changes in the annual mean temperature at Greeley, against neighbouring stations
Year
Shift (C)
Shift (F)
Strength
Neighbours
1952
-0.3
-0.5
likely
5
Possible change at the station (a move, a new instrument or a new site); the record is kept as measured. A "likely" change has a larger test statistic than a "possible" one. Neither says why the station differs from its neighbours. How changes are found, and the largest ones.
Download the Data
Data for Greeley standing records by year: CSV or JSON. Field meanings are on the data page.
Data for Greeley 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.