Record envelope, standing records and threshold days for Sycamore (USC00118452), Illinois, United States, with 73 years of record.
Key Facts for Sycamore
Sycamore (USC00118452) is a weather station in Illinois, United States at 41.98 latitude and -88.68 longitude, 256 m (840 ft) above sea level.
The station reports from 1893 to 1965, 73 years of record.
1,464 records set at Sycamore still stand.
Records are tracked for tmax, tmin, prcp, snow, snwd: an element needs 30 years of data to be eligible.
Sycamore tied a daily record high minimum temperature of 18.9 C (66.0 F) on 20 September 1965.
About the Station
Location: Illinois, United States, 41.98 latitude, -88.68 longitude.
Elevation: 256 m (840 ft).
Period of record: 1893 to 1965, 73 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 Sycamore. 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 Sycamore, with 2026 drawn through them
Month
Highest record high
Lowest record low
2026 highest maximum
2026 lowest minimum
Jan
17.2 C (63.0 F)
-31.7 C (-25.1 F)
n/a
n/a
Feb
18.9 C (66.0 F)
-32.2 C (-26.0 F)
n/a
n/a
Mar
28.9 C (84.0 F)
-25.0 C (-13.0 F)
n/a
n/a
Apr
33.3 C (91.9 F)
-10.0 C (14.0 F)
n/a
n/a
May
41.7 C (107.1 F)
-4.4 C (24.1 F)
n/a
n/a
Jun
41.1 C (106.0 F)
0.6 C (33.1 F)
n/a
n/a
Jul
42.8 C (109.0 F)
4.4 C (39.9 F)
n/a
n/a
Aug
40.0 C (104.0 F)
1.7 C (35.1 F)
n/a
n/a
Sep
38.3 C (100.9 F)
-5.6 C (21.9 F)
n/a
n/a
Oct
33.9 C (93.0 F)
-9.4 C (15.1 F)
n/a
n/a
Nov
27.8 C (82.0 F)
-22.8 C (-9.0 F)
n/a
n/a
Dec
18.9 C (66.0 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 Sycamore still stand. 1936 holds the most, with 48.
Standing records at Sycamore by the year they were set
Year set
Standing records
1896
23
1897
37
1898
14
1899
32
1900
30
1901
20
1902
19
1903
21
1904
12
1905
18
1906
11
1907
18
1908
28
1909
33
1910
27
1911
32
1912
27
1913
34
1914
26
1915
28
1916
27
1917
23
1918
27
1919
11
1920
22
1921
20
1922
17
1923
19
1924
24
1925
23
1926
15
1927
18
1928
19
1929
21
1930
39
1931
22
1932
24
1933
22
1934
29
1935
21
1936
48
1937
11
1938
22
1939
19
1940
26
1941
13
1942
21
1943
11
1944
20
1945
19
1946
18
1947
19
1948
15
1949
14
1950
17
1951
29
1952
15
1953
25
1954
10
1955
12
1956
12
1957
11
1958
9
1959
12
1960
22
1961
5
1962
23
1963
26
1964
17
1965
10
All-Time Record Progression
5 new records
5 all-time records were set at Sycamore between 19 July 1926 and 25 December 1951. Each dot is a new record.
When Sycamore set new all-time records
Date
Kind
Detail
1926-07-19
Record high minimum temperature
Record high minimum temperature 27.2 C (81.0 F)
1934-05-31
Record high maximum temperature
Record high maximum temperature 41.7 C (107.1 F)
1936-07-14
Record high maximum temperature
Record high maximum temperature 42.8 C (109.0 F)
1951-12-24
Record snow depth
Record snow depth 53.3 cm (21.0 in)
1951-12-25
Record snow depth
Record snow depth 68.6 cm (27.0 in)
Wettest Day of Each Month
Aug: 144.3 mm (5.7 in)
The wettest day on record for each calendar month at Sycamore. The most was 144.3 mm (5.7 in) on 23 August 1900.
Record daily precipitation for each month at Sycamore
Month
Record daily precipitation (mm)
Date
Jan
72.4 mm (2.9 in)
24 January 1938
Feb
50.8 mm (2.0 in)
27 February 1902
Mar
56.1 mm (2.2 in)
12 March 1902
Apr
81.5 mm (3.2 in)
30 April 1909
May
78.7 mm (3.1 in)
31 May 1941
Jun
82.0 mm (3.2 in)
3 June 1902
Jul
123.2 mm (4.9 in)
2 July 1958
Aug
144.3 mm (5.7 in)
23 August 1900
Sep
94.2 mm (3.7 in)
29 September 1906
Oct
128.3 mm (5.1 in)
10 October 1954
Nov
86.1 mm (3.4 in)
17 November 1928
Dec
70.1 mm (2.8 in)
29 December 1948
Period of Record Coverage
1896 to 1965
Complete yearUnder 90 percent of days
70 years of record at Sycamore, 1896 to 1965. 2 years have data for under 90 percent of days and are left out of rankings: 1896, 1965.
Cooler than the station meanWarmer than the station mean
One stripe for each of 66 complete years at Sycamore, 1897 to 1964. Blue stripes are years cooler than the station's own mean of 9.0 C (48.3 F); red stripes are warmer. The coolest year was 1917, at 7.1 C (44.8 F), and the warmest was 1921, at 10.9 C (51.5 F). The strongest colour marks a difference of 2.0 C (3.6 F).
Annual mean temperature at Sycamore as warming stripes, 1897 to 1964
Year
Annual mean temperature
Difference from the station mean
1897
8.6 C
-0.45 C
1898
8.7 C
-0.34 C
1899
8.7 C
-0.34 C
1900
9.2 C
+0.15 C
1901
8.5 C
-0.54 C
1902
9.2 C
+0.16 C
1903
8.6 C
-0.47 C
1904
7.3 C
-1.73 C
1905
8.4 C
-0.60 C
1906
9.2 C
+0.17 C
1907
8.2 C
-0.86 C
1908
9.5 C
+0.43 C
1909
8.8 C
-0.27 C
1910
8.9 C
-0.11 C
1911
9.6 C
+0.56 C
1912
8.0 C
-1.08 C
1913
9.8 C
+0.77 C
1915
7.9 C
-1.15 C
1916
8.5 C
-0.58 C
1917
7.1 C
-1.91 C
1918
8.9 C
-0.10 C
1919
9.4 C
+0.32 C
1920
8.8 C
-0.20 C
1921
10.9 C
+1.81 C
1922
9.8 C
+0.74 C
1923
9.0 C
-0.04 C
1924
7.6 C
-1.42 C
1925
9.0 C
-0.07 C
1926
8.2 C
-0.87 C
1927
9.6 C
+0.54 C
1928
9.3 C
+0.27 C
1929
7.9 C
-1.10 C
1930
9.5 C
+0.47 C
1931
10.7 C
+1.68 C
1932
9.2 C
+0.14 C
1933
9.7 C
+0.69 C
1934
9.9 C
+0.81 C
1935
8.8 C
-0.21 C
1936
8.6 C
-0.46 C
1937
8.5 C
-0.50 C
1938
10.3 C
+1.28 C
1939
10.2 C
+1.15 C
1940
8.4 C
-0.62 C
1941
10.0 C
+0.99 C
1942
9.2 C
+0.20 C
1943
8.7 C
-0.37 C
1944
9.6 C
+0.52 C
1945
8.4 C
-0.66 C
1946
10.0 C
+1.00 C
1947
8.8 C
-0.21 C
1948
9.0 C
+0.00 C
1949
9.7 C
+0.64 C
1950
7.9 C
-1.17 C
1951
8.0 C
-1.06 C
1952
9.6 C
+0.55 C
1953
10.3 C
+1.21 C
1954
10.1 C
+1.04 C
1955
9.8 C
+0.72 C
1956
9.9 C
+0.82 C
1957
9.3 C
+0.27 C
1958
8.3 C
-0.75 C
1959
9.2 C
+0.15 C
1961
9.3 C
+0.21 C
1962
8.7 C
-0.39 C
1963
8.5 C
-0.53 C
1964
9.6 C
+0.55 C
The annual mean temperature here has risen by 0.10 C (0.00 to 0.20) per decade over 1897 to 1964. In Fahrenheit: 0.18 F (0.01 to 0.36) 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 Sycamore
Measure
Per decade (C)
Per decade (F)
Period
Complete years
Reading
Annual mean temperature
0.10 C (0.00 to 0.20) per decade
0.18 F (0.01 to 0.36) per decade
1897 to 1964
66
Rise
Mean daily maximum
0.09 C (-0.02 to 0.21) per decade
0.17 F (-0.04 to 0.37) per decade
1897 to 1964
66
Not clearly different from zero
Mean daily minimum
0.11 C (0.01 to 0.21) per decade
0.20 F (0.01 to 0.38) per decade
1897 to 1964
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
1893 to 1965
Yearly extremes at Sycamore: 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)
1936
36.7 C (98.1 F)
70
Coldest night (TNn)
-32.2 C (-26.0 F)
1905
-25.6 C (-14.1 F)
70
Wettest day (Rx1day)
144.3 mm (5.7 in)
1900
64.0 mm (2.5 in)
73
Wettest five days (Rx5day)
203.0 mm (8.0 in)
1900
92.9 mm (3.7 in)
73
Longest dry spell (CDD)
55 days
1952
23 days
73
Hottest day (TXx)
The hottest day of the year at Sycamore, 1893 to 1965. The record is 42.8 C (109.0 F) in 1936, marked on the chart; the median year is 36.7 C (98.1 F).
Hottest day (TXx) at Sycamore by year
Year
Hottest day (TXx)
1893
n/a
1894
n/a
1895
n/a
1896
35.6 C (96.1 F)
1897
35.6 C (96.1 F)
1898
35.0 C (95.0 F)
1899
37.2 C (99.0 F)
1900
34.4 C (93.9 F)
1901
41.1 C (106.0 F)
1902
34.4 C (93.9 F)
1903
36.1 C (97.0 F)
1904
35.6 C (96.1 F)
1905
36.1 C (97.0 F)
1906
36.1 C (97.0 F)
1907
35.0 C (95.0 F)
1908
37.2 C (99.0 F)
1909
38.3 C (100.9 F)
1910
40.0 C (104.0 F)
1911
41.1 C (106.0 F)
1912
36.7 C (98.1 F)
1913
38.9 C (102.0 F)
1914
37.2 C (99.0 F)
1915
31.1 C (88.0 F)
1916
40.0 C (104.0 F)
1917
37.2 C (99.0 F)
1918
40.0 C (104.0 F)
1919
37.2 C (99.0 F)
1920
37.8 C (100.0 F)
1921
37.2 C (99.0 F)
1922
37.8 C (100.0 F)
1923
36.7 C (98.1 F)
1924
33.3 C (91.9 F)
1925
37.8 C (100.0 F)
1926
35.0 C (95.0 F)
1927
36.7 C (98.1 F)
1928
33.9 C (93.0 F)
1929
34.4 C (93.9 F)
1930
38.3 C (100.9 F)
1931
37.2 C (99.0 F)
1932
36.7 C (98.1 F)
1933
37.8 C (100.0 F)
1934
41.7 C (107.1 F)
1935
36.7 C (98.1 F)
1936
42.8 C (109.0 F)
1937
36.7 C (98.1 F)
1938
34.4 C (93.9 F)
1939
38.3 C (100.9 F)
1940
40.0 C (104.0 F)
1941
37.2 C (99.0 F)
1942
36.1 C (97.0 F)
1943
35.6 C (96.1 F)
1944
37.2 C (99.0 F)
1945
36.7 C (98.1 F)
1946
37.8 C (100.0 F)
1947
37.8 C (100.0 F)
1948
35.6 C (96.1 F)
1949
37.2 C (99.0 F)
1950
33.3 C (91.9 F)
1951
32.8 C (91.0 F)
1952
36.1 C (97.0 F)
1953
38.3 C (100.9 F)
1954
36.7 C (98.1 F)
1955
38.9 C (102.0 F)
1956
38.3 C (100.9 F)
1957
35.6 C (96.1 F)
1958
33.3 C (91.9 F)
1959
35.6 C (96.1 F)
1960
35.0 C (95.0 F)
1961
35.0 C (95.0 F)
1962
35.0 C (95.0 F)
1963
36.7 C (98.1 F)
1964
35.6 C (96.1 F)
1965
35.6 C (96.1 F)
Coldest night (TNn)
The coldest night of the year at Sycamore, 1893 to 1965. The record is -32.2 C (-26.0 F) in 1905, marked on the chart; the median year is -25.6 C (-14.1 F).
Coldest night (TNn) at Sycamore by year
Year
Coldest night (TNn)
1893
n/a
1894
n/a
1895
n/a
1896
-17.2 C (1.0 F)
1897
-30.6 C (-23.1 F)
1898
-22.8 C (-9.0 F)
1899
-30.6 C (-23.1 F)
1900
-24.4 C (-11.9 F)
1901
-25.6 C (-14.1 F)
1902
-26.1 C (-15.0 F)
1903
-28.3 C (-18.9 F)
1904
-28.3 C (-18.9 F)
1905
-32.2 C (-26.0 F)
1906
-18.3 C (-0.9 F)
1907
-25.0 C (-13.0 F)
1908
-23.9 C (-11.0 F)
1909
-25.6 C (-14.1 F)
1910
-26.7 C (-16.1 F)
1911
-20.6 C (-5.1 F)
1912
-28.9 C (-20.0 F)
1913
-22.8 C (-9.0 F)
1914
-30.0 C (-22.0 F)
1915
-30.0 C (-22.0 F)
1916
-26.7 C (-16.1 F)
1917
-27.2 C (-17.0 F)
1918
-28.9 C (-20.0 F)
1919
-30.0 C (-22.0 F)
1920
-24.4 C (-11.9 F)
1921
-18.3 C (-0.9 F)
1922
-24.4 C (-11.9 F)
1923
-25.0 C (-13.0 F)
1924
-31.1 C (-24.0 F)
1925
-25.6 C (-14.1 F)
1926
-23.9 C (-11.0 F)
1927
-28.3 C (-18.9 F)
1928
-23.3 C (-9.9 F)
1929
-31.7 C (-25.1 F)
1930
-31.7 C (-25.1 F)
1931
-20.6 C (-5.1 F)
1932
-25.6 C (-14.1 F)
1933
-32.2 C (-26.0 F)
1934
-23.3 C (-9.9 F)
1935
-24.4 C (-11.9 F)
1936
-31.7 C (-25.1 F)
1937
-20.0 C (-4.0 F)
1938
-20.0 C (-4.0 F)
1939
-17.8 C (0.0 F)
1940
-29.4 C (-20.9 F)
1941
-22.8 C (-9.0 F)
1942
-28.3 C (-18.9 F)
1943
-28.3 C (-18.9 F)
1944
-25.0 C (-13.0 F)
1945
-25.6 C (-14.1 F)
1946
-22.2 C (-8.0 F)
1947
-23.3 C (-9.9 F)
1948
-25.6 C (-14.1 F)
1949
-22.8 C (-9.0 F)
1950
-27.2 C (-17.0 F)
1951
-30.0 C (-22.0 F)
1952
-23.3 C (-9.9 F)
1953
-22.8 C (-9.0 F)
1954
-24.4 C (-11.9 F)
1955
-26.7 C (-16.1 F)
1956
-20.0 C (-4.0 F)
1957
-27.8 C (-18.0 F)
1958
-27.8 C (-18.0 F)
1959
-26.7 C (-16.1 F)
1960
-27.2 C (-17.0 F)
1961
-24.4 C (-11.9 F)
1962
-27.2 C (-17.0 F)
1963
-30.6 C (-23.1 F)
1964
-20.6 C (-5.1 F)
1965
-28.9 C (-20.0 F)
Wettest day (Rx1day)
The wettest day of the year at Sycamore, 1893 to 1965. The record is 144.3 mm (5.7 in) in 1900, marked on the chart; the median year is 64.0 mm (2.5 in).
Wettest day (Rx1day) at Sycamore by year
Year
Wettest day (Rx1day)
1893
52.8 mm (2.1 in)
1894
80.3 mm (3.2 in)
1895
66.3 mm (2.6 in)
1896
68.8 mm (2.7 in)
1897
71.9 mm (2.8 in)
1898
70.1 mm (2.8 in)
1899
67.1 mm (2.6 in)
1900
144.3 mm (5.7 in)
1901
32.8 mm (1.3 in)
1902
82.0 mm (3.2 in)
1903
61.0 mm (2.4 in)
1904
57.4 mm (2.3 in)
1905
77.5 mm (3.1 in)
1906
94.2 mm (3.7 in)
1907
71.1 mm (2.8 in)
1908
52.1 mm (2.1 in)
1909
81.5 mm (3.2 in)
1910
38.9 mm (1.5 in)
1911
44.2 mm (1.7 in)
1912
46.7 mm (1.8 in)
1913
50.8 mm (2.0 in)
1914
63.8 mm (2.5 in)
1915
53.1 mm (2.1 in)
1916
53.8 mm (2.1 in)
1917
55.9 mm (2.2 in)
1918
53.3 mm (2.1 in)
1919
74.4 mm (2.9 in)
1920
43.2 mm (1.7 in)
1921
52.3 mm (2.1 in)
1922
60.5 mm (2.4 in)
1923
61.7 mm (2.4 in)
1924
90.9 mm (3.6 in)
1925
47.8 mm (1.9 in)
1926
58.4 mm (2.3 in)
1927
42.4 mm (1.7 in)
1928
86.1 mm (3.4 in)
1929
61.0 mm (2.4 in)
1930
76.5 mm (3.0 in)
1931
64.3 mm (2.5 in)
1932
66.0 mm (2.6 in)
1933
68.6 mm (2.7 in)
1934
39.9 mm (1.6 in)
1935
79.2 mm (3.1 in)
1936
89.2 mm (3.5 in)
1937
51.1 mm (2.0 in)
1938
72.4 mm (2.9 in)
1939
59.2 mm (2.3 in)
1940
47.2 mm (1.9 in)
1941
78.7 mm (3.1 in)
1942
88.9 mm (3.5 in)
1943
77.7 mm (3.1 in)
1944
52.8 mm (2.1 in)
1945
64.0 mm (2.5 in)
1946
53.3 mm (2.1 in)
1947
75.2 mm (3.0 in)
1948
70.1 mm (2.8 in)
1949
94.0 mm (3.7 in)
1950
64.5 mm (2.5 in)
1951
91.4 mm (3.6 in)
1952
78.2 mm (3.1 in)
1953
54.9 mm (2.2 in)
1954
128.3 mm (5.1 in)
1955
97.8 mm (3.9 in)
1956
61.0 mm (2.4 in)
1957
84.3 mm (3.3 in)
1958
123.2 mm (4.9 in)
1959
64.0 mm (2.5 in)
1960
53.3 mm (2.1 in)
1961
62.5 mm (2.5 in)
1962
32.0 mm (1.3 in)
1963
62.2 mm (2.4 in)
1964
43.2 mm (1.7 in)
1965
79.8 mm (3.1 in)
Wettest five days (Rx5day)
The wettest five days of the year at Sycamore, 1893 to 1965. The record is 203.0 mm (8.0 in) in 1900, marked on the chart; the median year is 92.9 mm (3.7 in).
Wettest five days (Rx5day) at Sycamore by year
Year
Wettest five days (Rx5day)
1893
58.0 mm (2.3 in)
1894
125.3 mm (4.9 in)
1895
72.1 mm (2.8 in)
1896
110.0 mm (4.3 in)
1897
86.9 mm (3.4 in)
1898
73.7 mm (2.9 in)
1899
67.1 mm (2.6 in)
1900
203.0 mm (8.0 in)
1901
65.3 mm (2.6 in)
1902
133.1 mm (5.2 in)
1903
84.9 mm (3.3 in)
1904
102.4 mm (4.0 in)
1905
123.6 mm (4.9 in)
1906
110.7 mm (4.4 in)
1907
109.5 mm (4.3 in)
1908
82.8 mm (3.3 in)
1909
123.5 mm (4.9 in)
1910
63.3 mm (2.5 in)
1911
88.1 mm (3.5 in)
1912
85.6 mm (3.4 in)
1913
53.8 mm (2.1 in)
1914
98.3 mm (3.9 in)
1915
87.9 mm (3.5 in)
1916
131.7 mm (5.2 in)
1917
68.1 mm (2.7 in)
1918
95.0 mm (3.7 in)
1919
121.7 mm (4.8 in)
1920
79.8 mm (3.1 in)
1921
63.4 mm (2.5 in)
1922
98.6 mm (3.9 in)
1923
102.8 mm (4.0 in)
1924
131.9 mm (5.2 in)
1925
71.7 mm (2.8 in)
1926
92.7 mm (3.6 in)
1927
106.4 mm (4.2 in)
1928
100.1 mm (3.9 in)
1929
95.8 mm (3.8 in)
1930
96.8 mm (3.8 in)
1931
80.8 mm (3.2 in)
1932
92.9 mm (3.7 in)
1933
69.6 mm (2.7 in)
1934
93.3 mm (3.7 in)
1935
104.1 mm (4.1 in)
1936
176.5 mm (6.9 in)
1937
89.7 mm (3.5 in)
1938
79.5 mm (3.1 in)
1939
79.5 mm (3.1 in)
1940
118.2 mm (4.7 in)
1941
130.9 mm (5.2 in)
1942
105.4 mm (4.1 in)
1943
88.7 mm (3.5 in)
1944
87.6 mm (3.4 in)
1945
100.1 mm (3.9 in)
1946
75.9 mm (3.0 in)
1947
75.2 mm (3.0 in)
1948
70.1 mm (2.8 in)
1949
159.3 mm (6.3 in)
1950
85.6 mm (3.4 in)
1951
139.9 mm (5.5 in)
1952
101.1 mm (4.0 in)
1953
66.3 mm (2.6 in)
1954
133.9 mm (5.3 in)
1955
116.7 mm (4.6 in)
1956
83.1 mm (3.3 in)
1957
84.3 mm (3.3 in)
1958
161.3 mm (6.4 in)
1959
106.0 mm (4.2 in)
1960
87.6 mm (3.4 in)
1961
118.5 mm (4.7 in)
1962
52.6 mm (2.1 in)
1963
124.5 mm (4.9 in)
1964
67.8 mm (2.7 in)
1965
88.9 mm (3.5 in)
Longest dry spell (CDD)
The longest dry spell of the year at Sycamore, 1893 to 1965. The record is 55 days in 1952, marked on the chart; the median year is 23 days.
Longest dry spell (CDD) at Sycamore by year
Year
Longest dry spell (CDD)
1893
32 days
1894
24 days
1895
20 days
1896
22 days
1897
24 days
1898
23 days
1899
25 days
1900
19 days
1901
20 days
1902
21 days
1903
25 days
1904
50 days
1905
18 days
1906
22 days
1907
21 days
1908
25 days
1909
33 days
1910
34 days
1911
15 days
1912
26 days
1913
33 days
1914
22 days
1915
34 days
1916
23 days
1917
20 days
1918
23 days
1919
42 days
1920
31 days
1921
15 days
1922
20 days
1923
21 days
1924
23 days
1925
22 days
1926
16 days
1927
23 days
1928
19 days
1929
14 days
1930
32 days
1931
18 days
1932
29 days
1933
33 days
1934
30 days
1935
19 days
1936
26 days
1937
25 days
1938
23 days
1939
30 days
1940
18 days
1941
17 days
1942
28 days
1943
25 days
1944
27 days
1945
24 days
1946
20 days
1947
23 days
1948
19 days
1949
22 days
1950
30 days
1951
16 days
1952
55 days
1953
25 days
1954
19 days
1955
16 days
1956
17 days
1957
23 days
1958
31 days
1959
25 days
1960
26 days
1961
16 days
1962
21 days
1963
18 days
1964
20 days
1965
17 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 Sycamore falls on 8 May and the median first autumn frost on 4 October, which leaves a median of 153 days between them.
In 1934 to 1964 the median growing season was 154 days. That is 3 days more than in 1897 to 1927.
Fitted over all years, the growing season changes by +1.0 days per decade at this station.
Frost dates and growing season at Sycamore
Measure
Median, all years
Earliest period (1897 to 1927)
Recent period (1934 to 1964)
Recent against earliest
Fitted trend
Last spring frost
8 May
8 May
8 May
no change
-0.6 days per decade
First autumn frost
4 October
5 October
3 October
2 days earlier
+0.4 days per decade
Growing days
153 days
151 days
154 days
3 days more
+1.0 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, 1893 to 1964
A day with at least 63.5 mm (2.5 in) of rain is expected about once in 2 years. A day with at least 132.4 mm (5.2 in) of rain is expected about once in 100 years.
Rainfall return levels at Sycamore: the daily rain expected about once in a given number of years
Expected about once in
A day with at least
Note
2 years
63.5 mm (2.5 in)
5 years
81.5 mm (3.2 in)
10 years
93.6 mm (3.7 in)
25 years
109.1 mm (4.3 in)
50 years
120.7 mm (4.8 in)
100 years
132.4 mm (5.2 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 1893 to 1964.
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: 144.3 mm (5.7 in) in 1900; 128.3 mm (5.1 in) in 1954; 123.2 mm (4.9 in) in 1958.
Station Changes
1 suspected
One change was suspected in the annual mean temperature of Sycamore, at 1955. Each is measured against neighbouring stations.
Relative to 5 neighbouring stations, the station's annual mean temperature from 1955 ran 0.2 C (0.4 F) higher than in the years before (possible change).
Suspected changes in the annual mean temperature at Sycamore, against neighbouring stations
Year
Shift (C)
Shift (F)
Strength
Neighbours
1955
+0.2
+0.4
possible
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 Sycamore standing records by year: CSV or JSON. Field meanings are on the data page.
Data for Sycamore 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 2026-10-16 (16 October 2026). Records are computed by this site and are not official.