Record envelope, standing records and threshold days for Bloomington Normal (USC00110766), Illinois, United States, with 85 years of record.
Key Facts for Bloomington Normal
Bloomington Normal (USC00110766) is a weather station in Illinois, United States at 40.52 latitude and -89.00 longitude, 241 m (791 ft) above sea level.
The station reports from 1893 to 1977, 85 years of record.
1,464 records set at Bloomington Normal still stand.
Records are tracked for tmax, tmin, prcp, snow, snwd: an element needs 30 years of data to be eligible.
Bloomington Normal set a daily record high minimum temperature of 21.1 C (70.0 F) on 22 May 1977.
About the Station
Location: Illinois, United States, 40.52 latitude, -89.00 longitude.
Elevation: 241 m (791 ft).
Period of record: 1893 to 1977, 85 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 Bloomington Normal. 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 Bloomington Normal, with 2026 drawn through them
Month
Highest record high
Lowest record low
2026 highest maximum
2026 lowest minimum
Jan
20.6 C (69.1 F)
-31.1 C (-24.0 F)
n/a
n/a
Feb
21.7 C (71.1 F)
-31.1 C (-24.0 F)
n/a
n/a
Mar
31.1 C (88.0 F)
-26.1 C (-15.0 F)
n/a
n/a
Apr
35.0 C (95.0 F)
-10.0 C (14.0 F)
n/a
n/a
May
39.4 C (102.9 F)
-6.1 C (21.0 F)
n/a
n/a
Jun
41.1 C (106.0 F)
-0.6 C (30.9 F)
n/a
n/a
Jul
45.6 C (114.1 F)
5.0 C (41.0 F)
n/a
n/a
Aug
40.6 C (105.1 F)
3.3 C (37.9 F)
n/a
n/a
Sep
39.4 C (102.9 F)
-5.6 C (21.9 F)
n/a
n/a
Oct
33.9 C (93.0 F)
-12.8 C (9.0 F)
n/a
n/a
Nov
27.8 C (82.0 F)
-21.7 C (-7.1 F)
n/a
n/a
Dec
21.1 C (70.0 F)
-26.1 C (-15.0 F)
n/a
n/a
Which Years Hold Standing Records
1,464 standing records
Year with most
1,464 records at Bloomington Normal still stand. 1894 holds the most, with 58.
Standing records at Bloomington Normal by the year they were set
Year set
Standing records
1893
26
1894
58
1895
43
1896
37
1897
32
1898
14
1899
25
1900
14
1901
24
1902
18
1903
20
1904
8
1905
19
1906
14
1907
25
1908
15
1909
27
1910
20
1911
24
1912
14
1913
27
1914
18
1915
24
1916
26
1917
25
1918
20
1919
7
1920
11
1921
10
1922
10
1923
17
1924
17
1925
30
1926
9
1927
12
1928
21
1929
17
1930
38
1931
16
1932
20
1933
16
1934
25
1935
13
1936
48
1937
19
1938
15
1939
15
1940
14
1941
10
1942
17
1943
17
1944
14
1945
15
1946
11
1947
10
1948
10
1949
8
1950
24
1951
13
1952
11
1953
11
1954
11
1955
10
1956
8
1957
4
1958
12
1959
14
1960
18
1961
7
1962
17
1963
15
1964
5
1965
12
1966
10
1967
16
1968
9
1969
4
1970
13
1971
12
1972
13
1973
8
1974
20
1975
11
1976
13
1977
14
All-Time Record Progression
5 new records
5 all-time records were set at Bloomington Normal between 6 July 1936 and 3 August 1943. Each dot is a new record.
When Bloomington Normal set new all-time records
Date
Kind
Detail
1936-07-06
Record high maximum temperature
Record high maximum temperature 42.8 C (109.0 F)
1936-07-12
Record high maximum temperature
Record high maximum temperature 43.3 C (109.9 F)
1936-07-14
Record high maximum temperature
Record high maximum temperature 43.9 C (111.0 F)
1936-07-15
Record high maximum temperature
Record high maximum temperature 45.6 C (114.1 F)
1943-08-03
Record daily precipitation
Record daily precipitation 154.9 mm (6.1 in)
Wettest Day of Each Month
Aug: 154.9 mm (6.1 in)
The wettest day on record for each calendar month at Bloomington Normal. The most was 154.9 mm (6.1 in) on 3 August 1943.
Record daily precipitation for each month at Bloomington Normal
Month
Record daily precipitation (mm)
Date
Jan
61.0 mm (2.4 in)
1 January 1965
Feb
57.2 mm (2.3 in)
28 February 1900
Mar
61.5 mm (2.4 in)
27 March 1898
Apr
83.6 mm (3.3 in)
30 April 1947
May
99.6 mm (3.9 in)
2 May 1936
Jun
101.6 mm (4.0 in)
12 June 1946
Jul
93.0 mm (3.7 in)
6 July 1929
Aug
154.9 mm (6.1 in)
3 August 1943
Sep
98.8 mm (3.9 in)
14 September 1972
Oct
74.2 mm (2.9 in)
4 October 1941
Nov
97.8 mm (3.9 in)
2 November 1936
Dec
86.4 mm (3.4 in)
21 December 1949
Period of Record Coverage
1893 to 1977
Complete yearUnder 90 percent of days
85 years of record at Bloomington Normal, 1893 to 1977. 3 years have data for under 90 percent of days and are left out of rankings: 1893, 1894, 1977.
Cooler than the station meanWarmer than the station mean
One stripe for each of 79 complete years at Bloomington Normal, 1897 to 1976. Blue stripes are years cooler than the station's own mean of 11.3 C (52.3 F); red stripes are warmer. The coolest year was 1917, at 9.2 C (48.5 F), and the warmest was 1921, at 13.1 C (55.6 F). The strongest colour marks a difference of 2.2 C (4.0 F).
Annual mean temperature at Bloomington Normal as warming stripes, 1897 to 1976
Year
Annual mean temperature
Difference from the station mean
1897
11.1 C
-0.19 C
1898
11.5 C
+0.25 C
1899
11.3 C
+0.01 C
1901
11.1 C
-0.18 C
1902
11.0 C
-0.29 C
1903
10.9 C
-0.39 C
1904
10.3 C
-0.92 C
1905
11.1 C
-0.12 C
1906
11.8 C
+0.58 C
1907
10.9 C
-0.41 C
1908
11.8 C
+0.53 C
1909
10.9 C
-0.40 C
1910
11.0 C
-0.22 C
1911
11.8 C
+0.55 C
1912
10.0 C
-1.23 C
1913
11.9 C
+0.65 C
1914
11.5 C
+0.25 C
1915
11.0 C
-0.27 C
1916
11.0 C
-0.29 C
1917
9.2 C
-2.11 C
1918
11.0 C
-0.27 C
1919
11.5 C
+0.24 C
1920
10.9 C
-0.32 C
1921
13.1 C
+1.85 C
1922
11.7 C
+0.45 C
1923
11.0 C
-0.26 C
1924
9.7 C
-1.54 C
1925
11.2 C
-0.06 C
1926
10.4 C
-0.86 C
1927
11.4 C
+0.12 C
1928
11.2 C
-0.11 C
1929
10.1 C
-1.15 C
1930
11.8 C
+0.54 C
1931
13.0 C
+1.70 C
1932
11.1 C
-0.18 C
1933
12.1 C
+0.81 C
1934
11.8 C
+0.52 C
1935
10.7 C
-0.56 C
1936
11.2 C
-0.11 C
1937
10.4 C
-0.85 C
1938
12.6 C
+1.32 C
1939
11.9 C
+0.62 C
1940
10.4 C
-0.91 C
1941
12.2 C
+0.90 C
1942
11.1 C
-0.18 C
1943
10.4 C
-0.83 C
1944
11.2 C
-0.08 C
1945
10.8 C
-0.47 C
1946
12.5 C
+1.21 C
1947
11.2 C
-0.05 C
1948
11.6 C
+0.37 C
1949
12.3 C
+0.99 C
1950
10.5 C
-0.73 C
1951
10.6 C
-0.62 C
1952
11.9 C
+0.66 C
1953
12.5 C
+1.26 C
1954
12.7 C
+1.45 C
1955
11.9 C
+0.68 C
1956
12.1 C
+0.83 C
1957
11.3 C
+0.06 C
1958
11.0 C
-0.30 C
1959
11.9 C
+0.64 C
1960
10.6 C
-0.63 C
1961
11.3 C
+0.04 C
1962
11.1 C
-0.15 C
1963
11.0 C
-0.31 C
1964
12.0 C
+0.74 C
1965
11.7 C
+0.41 C
1966
10.7 C
-0.53 C
1967
10.5 C
-0.73 C
1968
10.9 C
-0.33 C
1969
10.4 C
-0.89 C
1970
10.9 C
-0.32 C
1971
11.7 C
+0.42 C
1972
10.5 C
-0.77 C
1973
12.1 C
+0.83 C
1974
11.2 C
-0.09 C
1975
11.4 C
+0.12 C
1976
10.6 C
-0.66 C
The fitted trend in annual mean temperature here over 1897 to 1976 is 0.03 C (-0.05 to 0.10) per decade. The interval includes zero, so the trend is not clearly different from zero. In Fahrenheit: 0.05 F (-0.08 to 0.18) per decade. The slope is a straight line fitted to 79 complete years; the brackets give its 95 percent interval.
Fitted temperature trends per decade at Bloomington Normal
Measure
Per decade (C)
Per decade (F)
Period
Complete years
Reading
Annual mean temperature
0.03 C (-0.05 to 0.10) per decade
0.05 F (-0.08 to 0.18) per decade
1897 to 1976
79
Not clearly different from zero
Mean daily maximum
-0.04 C (-0.12 to 0.04) per decade
-0.1 F (-0.2 to 0.1) per decade
1897 to 1976
79
Not clearly different from zero
Mean daily minimum
0.10 C (0.02 to 0.17) per decade
0.17 F (0.04 to 0.30) per decade
1897 to 1976
79
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 1977
Yearly extremes at Bloomington Normal: the record and the median year
Measure
Record
Year of the record
Median year
Years with a value
Hottest day (TXx)
45.6 C (114.1 F)
1936
36.7 C (98.1 F)
85
Coldest night (TNn)
-31.1 C (-24.0 F)
1894
-23.9 C (-11.0 F)
85
Wettest day (Rx1day)
154.9 mm (6.1 in)
1943
58.9 mm (2.3 in)
85
Wettest five days (Rx5day)
183.9 mm (7.2 in)
1924
96.2 mm (3.8 in)
85
Longest dry spell (CDD)
46 days
1939
21 days
85
Hottest day (TXx)
The hottest day of the year at Bloomington Normal, 1893 to 1977. The record is 45.6 C (114.1 F) in 1936, marked on the chart; the median year is 36.7 C (98.1 F).
Hottest day (TXx) at Bloomington Normal by year
Year
Hottest day (TXx)
1893
40.6 C (105.1 F)
1894
41.1 C (106.0 F)
1895
39.4 C (102.9 F)
1896
36.7 C (98.1 F)
1897
39.4 C (102.9 F)
1898
36.7 C (98.1 F)
1899
39.4 C (102.9 F)
1900
35.0 C (95.0 F)
1901
42.2 C (108.0 F)
1902
35.0 C (95.0 F)
1903
37.8 C (100.0 F)
1904
35.0 C (95.0 F)
1905
37.8 C (100.0 F)
1906
37.8 C (100.0 F)
1907
36.1 C (97.0 F)
1908
37.2 C (99.0 F)
1909
36.7 C (98.1 F)
1910
36.7 C (98.1 F)
1911
39.4 C (102.9 F)
1912
36.1 C (97.0 F)
1913
41.7 C (107.1 F)
1914
40.0 C (104.0 F)
1915
33.9 C (93.0 F)
1916
42.2 C (108.0 F)
1917
37.2 C (99.0 F)
1918
40.6 C (105.1 F)
1919
38.3 C (100.9 F)
1920
37.8 C (100.0 F)
1921
37.2 C (99.0 F)
1922
36.1 C (97.0 F)
1923
37.2 C (99.0 F)
1924
35.6 C (96.1 F)
1925
38.9 C (102.0 F)
1926
36.7 C (98.1 F)
1927
36.1 C (97.0 F)
1928
35.0 C (95.0 F)
1929
34.4 C (93.9 F)
1930
41.1 C (106.0 F)
1931
40.0 C (104.0 F)
1932
37.2 C (99.0 F)
1933
38.9 C (102.0 F)
1934
41.1 C (106.0 F)
1935
36.7 C (98.1 F)
1936
45.6 C (114.1 F)
1937
38.9 C (102.0 F)
1938
36.7 C (98.1 F)
1939
38.9 C (102.0 F)
1940
40.6 C (105.1 F)
1941
37.8 C (100.0 F)
1942
35.0 C (95.0 F)
1943
35.6 C (96.1 F)
1944
37.2 C (99.0 F)
1945
36.1 C (97.0 F)
1946
36.7 C (98.1 F)
1947
39.4 C (102.9 F)
1948
36.7 C (98.1 F)
1949
36.1 C (97.0 F)
1950
34.4 C (93.9 F)
1951
35.6 C (96.1 F)
1952
37.8 C (100.0 F)
1953
38.3 C (100.9 F)
1954
40.6 C (105.1 F)
1955
36.7 C (98.1 F)
1956
36.7 C (98.1 F)
1957
36.1 C (97.0 F)
1958
34.4 C (93.9 F)
1959
35.6 C (96.1 F)
1960
36.1 C (97.0 F)
1961
33.9 C (93.0 F)
1962
36.7 C (98.1 F)
1963
36.1 C (97.0 F)
1964
37.2 C (99.0 F)
1965
35.0 C (95.0 F)
1966
38.3 C (100.9 F)
1967
34.4 C (93.9 F)
1968
35.6 C (96.1 F)
1969
34.4 C (93.9 F)
1970
36.7 C (98.1 F)
1971
36.7 C (98.1 F)
1972
35.0 C (95.0 F)
1973
34.4 C (93.9 F)
1974
36.7 C (98.1 F)
1975
33.9 C (93.0 F)
1976
35.6 C (96.1 F)
1977
35.6 C (96.1 F)
Coldest night (TNn)
The coldest night of the year at Bloomington Normal, 1893 to 1977. The record is -31.1 C (-24.0 F) in 1894, marked on the chart; the median year is -23.9 C (-11.0 F).
Coldest night (TNn) at Bloomington Normal by year
Year
Coldest night (TNn)
1893
-28.3 C (-18.9 F)
1894
-31.1 C (-24.0 F)
1895
-31.1 C (-24.0 F)
1896
-22.2 C (-8.0 F)
1897
-28.3 C (-18.9 F)
1898
-22.2 C (-8.0 F)
1899
-30.0 C (-22.0 F)
1900
-21.1 C (-6.0 F)
1901
-25.0 C (-13.0 F)
1902
-23.3 C (-9.9 F)
1903
-26.7 C (-16.1 F)
1904
-24.4 C (-11.9 F)
1905
-31.1 C (-24.0 F)
1906
-16.7 C (1.9 F)
1907
-18.9 C (-2.0 F)
1908
-19.4 C (-2.9 F)
1909
-24.4 C (-11.9 F)
1910
-21.7 C (-7.1 F)
1911
-19.4 C (-2.9 F)
1912
-28.3 C (-18.9 F)
1913
-20.0 C (-4.0 F)
1914
-25.0 C (-13.0 F)
1915
-27.2 C (-17.0 F)
1916
-25.6 C (-14.1 F)
1917
-26.1 C (-15.0 F)
1918
-30.6 C (-23.1 F)
1919
-23.9 C (-11.0 F)
1920
-22.2 C (-8.0 F)
1921
-15.0 C (5.0 F)
1922
-22.8 C (-9.0 F)
1923
-22.2 C (-8.0 F)
1924
-27.8 C (-18.0 F)
1925
-21.1 C (-6.0 F)
1926
-20.6 C (-5.1 F)
1927
-27.8 C (-18.0 F)
1928
-25.0 C (-13.0 F)
1929
-22.8 C (-9.0 F)
1930
-27.8 C (-18.0 F)
1931
-15.6 C (3.9 F)
1932
-26.1 C (-15.0 F)
1933
-28.3 C (-18.9 F)
1934
-26.1 C (-15.0 F)
1935
-25.0 C (-13.0 F)
1936
-28.9 C (-20.0 F)
1937
-20.6 C (-5.1 F)
1938
-18.3 C (-0.9 F)
1939
-20.6 C (-5.1 F)
1940
-25.6 C (-14.1 F)
1941
-18.9 C (-2.0 F)
1942
-24.4 C (-11.9 F)
1943
-26.1 C (-15.0 F)
1944
-26.1 C (-15.0 F)
1945
-22.2 C (-8.0 F)
1946
-18.3 C (-0.9 F)
1947
-18.3 C (-0.9 F)
1948
-20.6 C (-5.1 F)
1949
-20.0 C (-4.0 F)
1950
-24.4 C (-11.9 F)
1951
-26.7 C (-16.1 F)
1952
-18.3 C (-0.9 F)
1953
-20.6 C (-5.1 F)
1954
-20.0 C (-4.0 F)
1955
-25.0 C (-13.0 F)
1956
-17.8 C (0.0 F)
1957
-25.0 C (-13.0 F)
1958
-23.9 C (-11.0 F)
1959
-22.8 C (-9.0 F)
1960
-21.7 C (-7.1 F)
1961
-21.7 C (-7.1 F)
1962
-23.3 C (-9.9 F)
1963
-26.7 C (-16.1 F)
1964
-17.2 C (1.0 F)
1965
-21.7 C (-7.1 F)
1966
-26.1 C (-15.0 F)
1967
-22.8 C (-9.0 F)
1968
-26.1 C (-15.0 F)
1969
-21.7 C (-7.1 F)
1970
-27.2 C (-17.0 F)
1971
-21.7 C (-7.1 F)
1972
-26.1 C (-15.0 F)
1973
-23.9 C (-11.0 F)
1974
-26.1 C (-15.0 F)
1975
-26.1 C (-15.0 F)
1976
-24.4 C (-11.9 F)
1977
-29.4 C (-20.9 F)
Wettest day (Rx1day)
The wettest day of the year at Bloomington Normal, 1893 to 1977. The record is 154.9 mm (6.1 in) in 1943, marked on the chart; the median year is 58.9 mm (2.3 in).
Wettest day (Rx1day) at Bloomington Normal by year
Year
Wettest day (Rx1day)
1893
48.8 mm (1.9 in)
1894
51.6 mm (2.0 in)
1895
82.0 mm (3.2 in)
1896
53.3 mm (2.1 in)
1897
52.8 mm (2.1 in)
1898
61.5 mm (2.4 in)
1899
48.3 mm (1.9 in)
1900
57.2 mm (2.3 in)
1901
39.6 mm (1.6 in)
1902
59.4 mm (2.3 in)
1903
45.5 mm (1.8 in)
1904
66.8 mm (2.6 in)
1905
71.6 mm (2.8 in)
1906
67.1 mm (2.6 in)
1907
48.0 mm (1.9 in)
1908
56.1 mm (2.2 in)
1909
40.1 mm (1.6 in)
1910
75.2 mm (3.0 in)
1911
49.0 mm (1.9 in)
1912
59.4 mm (2.3 in)
1913
55.4 mm (2.2 in)
1914
68.3 mm (2.7 in)
1915
61.2 mm (2.4 in)
1916
63.5 mm (2.5 in)
1917
61.0 mm (2.4 in)
1918
62.2 mm (2.4 in)
1919
85.6 mm (3.4 in)
1920
61.0 mm (2.4 in)
1921
127.0 mm (5.0 in)
1922
40.1 mm (1.6 in)
1923
79.5 mm (3.1 in)
1924
120.4 mm (4.7 in)
1925
48.8 mm (1.9 in)
1926
91.9 mm (3.6 in)
1927
99.1 mm (3.9 in)
1928
50.0 mm (2.0 in)
1929
93.0 mm (3.7 in)
1930
41.9 mm (1.6 in)
1931
55.9 mm (2.2 in)
1932
42.7 mm (1.7 in)
1933
48.8 mm (1.9 in)
1934
52.8 mm (2.1 in)
1935
70.4 mm (2.8 in)
1936
99.6 mm (3.9 in)
1937
57.2 mm (2.3 in)
1938
52.3 mm (2.1 in)
1939
50.8 mm (2.0 in)
1940
51.3 mm (2.0 in)
1941
74.2 mm (2.9 in)
1942
45.7 mm (1.8 in)
1943
154.9 mm (6.1 in)
1944
44.5 mm (1.8 in)
1945
67.6 mm (2.7 in)
1946
101.6 mm (4.0 in)
1947
83.6 mm (3.3 in)
1948
37.3 mm (1.5 in)
1949
86.4 mm (3.4 in)
1950
43.2 mm (1.7 in)
1951
49.5 mm (1.9 in)
1952
56.1 mm (2.2 in)
1953
49.5 mm (1.9 in)
1954
50.3 mm (2.0 in)
1955
55.4 mm (2.2 in)
1956
60.7 mm (2.4 in)
1957
71.4 mm (2.8 in)
1958
95.5 mm (3.8 in)
1959
70.9 mm (2.8 in)
1960
93.5 mm (3.7 in)
1961
74.9 mm (2.9 in)
1962
51.3 mm (2.0 in)
1963
51.1 mm (2.0 in)
1964
52.6 mm (2.1 in)
1965
86.1 mm (3.4 in)
1966
58.9 mm (2.3 in)
1967
51.3 mm (2.0 in)
1968
90.7 mm (3.6 in)
1969
45.0 mm (1.8 in)
1970
73.9 mm (2.9 in)
1971
57.9 mm (2.3 in)
1972
98.8 mm (3.9 in)
1973
56.6 mm (2.2 in)
1974
62.7 mm (2.5 in)
1975
69.9 mm (2.8 in)
1976
88.6 mm (3.5 in)
1977
46.0 mm (1.8 in)
Wettest five days (Rx5day)
The wettest five days of the year at Bloomington Normal, 1893 to 1977. The record is 183.9 mm (7.2 in) in 1924, marked on the chart; the median year is 96.2 mm (3.8 in).
Wettest five days (Rx5day) at Bloomington Normal by year
Year
Wettest five days (Rx5day)
1893
77.6 mm (3.1 in)
1894
87.9 mm (3.5 in)
1895
158.3 mm (6.2 in)
1896
136.4 mm (5.4 in)
1897
101.8 mm (4.0 in)
1898
106.3 mm (4.2 in)
1899
63.5 mm (2.5 in)
1900
74.4 mm (2.9 in)
1901
47.8 mm (1.9 in)
1902
130.1 mm (5.1 in)
1903
90.8 mm (3.6 in)
1904
79.5 mm (3.1 in)
1905
86.6 mm (3.4 in)
1906
95.5 mm (3.8 in)
1907
103.7 mm (4.1 in)
1908
122.9 mm (4.8 in)
1909
66.8 mm (2.6 in)
1910
96.1 mm (3.8 in)
1911
82.9 mm (3.3 in)
1912
83.0 mm (3.3 in)
1913
123.4 mm (4.9 in)
1914
87.1 mm (3.4 in)
1915
105.1 mm (4.1 in)
1916
96.2 mm (3.8 in)
1917
107.5 mm (4.2 in)
1918
83.5 mm (3.3 in)
1919
100.4 mm (4.0 in)
1920
90.7 mm (3.6 in)
1921
129.3 mm (5.1 in)
1922
69.6 mm (2.7 in)
1923
140.4 mm (5.5 in)
1924
183.9 mm (7.2 in)
1925
66.6 mm (2.6 in)
1926
182.8 mm (7.2 in)
1927
176.6 mm (7.0 in)
1928
92.2 mm (3.6 in)
1929
156.0 mm (6.1 in)
1930
73.4 mm (2.9 in)
1931
79.8 mm (3.1 in)
1932
70.1 mm (2.8 in)
1933
109.7 mm (4.3 in)
1934
91.8 mm (3.6 in)
1935
123.8 mm (4.9 in)
1936
121.4 mm (4.8 in)
1937
61.0 mm (2.4 in)
1938
77.2 mm (3.0 in)
1939
80.8 mm (3.2 in)
1940
70.9 mm (2.8 in)
1941
157.9 mm (6.2 in)
1942
77.5 mm (3.1 in)
1943
157.9 mm (6.2 in)
1944
86.7 mm (3.4 in)
1945
82.1 mm (3.2 in)
1946
107.6 mm (4.2 in)
1947
109.5 mm (4.3 in)
1948
57.4 mm (2.3 in)
1949
118.2 mm (4.7 in)
1950
105.6 mm (4.2 in)
1951
76.9 mm (3.0 in)
1952
82.3 mm (3.2 in)
1953
99.3 mm (3.9 in)
1954
64.1 mm (2.5 in)
1955
80.5 mm (3.2 in)
1956
134.0 mm (5.3 in)
1957
112.5 mm (4.4 in)
1958
130.3 mm (5.1 in)
1959
72.4 mm (2.9 in)
1960
116.6 mm (4.6 in)
1961
152.1 mm (6.0 in)
1962
92.7 mm (3.6 in)
1963
56.9 mm (2.2 in)
1964
116.1 mm (4.6 in)
1965
147.1 mm (5.8 in)
1966
88.4 mm (3.5 in)
1967
76.4 mm (3.0 in)
1968
133.0 mm (5.2 in)
1969
123.4 mm (4.9 in)
1970
102.7 mm (4.0 in)
1971
109.5 mm (4.3 in)
1972
105.2 mm (4.1 in)
1973
92.4 mm (3.6 in)
1974
116.3 mm (4.6 in)
1975
80.3 mm (3.2 in)
1976
111.7 mm (4.4 in)
1977
128.1 mm (5.0 in)
Longest dry spell (CDD)
The longest dry spell of the year at Bloomington Normal, 1893 to 1977. The record is 46 days in 1939, marked on the chart; the median year is 21 days.
Longest dry spell (CDD) at Bloomington Normal by year
Year
Longest dry spell (CDD)
1893
16 days
1894
24 days
1895
20 days
1896
28 days
1897
38 days
1898
19 days
1899
19 days
1900
16 days
1901
21 days
1902
20 days
1903
17 days
1904
32 days
1905
19 days
1906
18 days
1907
21 days
1908
26 days
1909
17 days
1910
29 days
1911
18 days
1912
17 days
1913
20 days
1914
29 days
1915
23 days
1916
29 days
1917
30 days
1918
12 days
1919
43 days
1920
25 days
1921
17 days
1922
16 days
1923
21 days
1924
22 days
1925
22 days
1926
12 days
1927
19 days
1928
18 days
1929
15 days
1930
30 days
1931
19 days
1932
17 days
1933
26 days
1934
24 days
1935
20 days
1936
32 days
1937
15 days
1938
23 days
1939
46 days
1940
20 days
1941
28 days
1942
27 days
1943
27 days
1944
28 days
1945
26 days
1946
18 days
1947
22 days
1948
27 days
1949
22 days
1950
19 days
1951
15 days
1952
21 days
1953
24 days
1954
32 days
1955
14 days
1956
21 days
1957
22 days
1958
23 days
1959
19 days
1960
24 days
1961
21 days
1962
20 days
1963
19 days
1964
24 days
1965
14 days
1966
23 days
1967
27 days
1968
17 days
1969
27 days
1970
16 days
1971
30 days
1972
18 days
1973
20 days
1974
17 days
1975
13 days
1976
25 days
1977
19 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
79 years with a frost
Across 79 years with a frost, the median last spring frost at Bloomington Normal falls on 25 April and the median first autumn frost on 16 October, which leaves a median of 173 days between them.
In 1947 to 1976 the median growing season was 184 days. That is 13 days more than in 1897 to 1927.
Fitted over all years, the growing season changes by +1.8 days per decade at this station.
Frost dates and growing season at Bloomington Normal
Measure
Median, all years
Earliest period (1897 to 1927)
Recent period (1947 to 1976)
Recent against earliest
Fitted trend
Last spring frost
25 April
25 April
24 April
1 day earlier
-0.5 days per decade
First autumn frost
16 October
13 October
20 October
7 days later
+1.3 days per decade
Growing days
173 days
171 days
184 days
13 days more
+1.8 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
82 years, 1893 to 1976
A day with at least 59.9 mm (2.4 in) of rain is expected about once in 2 years. A day with at least 149.3 mm (5.9 in) of rain is expected about once in 100 years.
Rainfall return levels at Bloomington Normal: the daily rain expected about once in a given number of years
Expected about once in
A day with at least
Note
2 years
59.9 mm (2.4 in)
5 years
77.9 mm (3.1 in)
10 years
91.8 mm (3.6 in)
25 years
112.3 mm (4.4 in)
50 years
129.7 mm (5.1 in)
100 years
149.3 mm (5.9 in)
Longer than the 82 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, 82 years of values from 1893 to 1976.
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: 154.9 mm (6.1 in) in 1943; 127.0 mm (5.0 in) in 1921; 120.4 mm (4.7 in) in 1924.
Station Changes
3 suspected
3 changes were suspected in the annual mean temperature of Bloomington Normal, at 1932, 1947 and 1966. Each is measured against neighbouring stations.
Relative to 5 neighbouring stations, the station's annual mean temperature from 1932 ran 0.2 C (0.3 F) lower than in the years before (likely change).
Relative to 5 neighbouring stations, the station's annual mean temperature from 1947 ran 0.4 C (0.7 F) higher than in the years before (likely change).
Relative to 5 neighbouring stations, the station's annual mean temperature from 1966 ran 0.2 C (0.3 F) lower than in the years before (possible change).
Suspected changes in the annual mean temperature at Bloomington Normal, against neighbouring stations
Year
Shift (C)
Shift (F)
Strength
Neighbours
1932
-0.2
-0.3
likely
5
1947
+0.4
+0.7
likely
5
1966
-0.2
-0.3
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 Bloomington Normal standing records by year: CSV or JSON. Field meanings are on the data page.
Data for Bloomington Normal 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 2026-10-15 (15 October 2026). Records are computed by this site and are not official.