Record envelope, standing records and threshold days for Hillsboro (USC00473649), Wisconsin, United States, with 66 years of record.
Key Facts for Hillsboro
Hillsboro (USC00473649) is a weather station in Wisconsin, United States at 43.65 latitude and -90.33 longitude, 305 m (1,001 ft) above sea level.
The station reports from 1893 to 1958, 66 years of record.
1,464 records set at Hillsboro still stand.
Records are tracked for tmax, tmin, prcp, snow: an element needs 30 years of data to be eligible.
Hillsboro set a daily record high maximum temperature of 7.8 C (46.0 F) on 28 December 1958.
About the Station
Location: Wisconsin, United States, 43.65 latitude, -90.33 longitude.
Elevation: 305 m (1,001 ft).
Period of record: 1893 to 1958, 66 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 Hillsboro. 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 Hillsboro, with 2026 drawn through them
Month
Highest record high
Lowest record low
2026 highest maximum
2026 lowest minimum
Jan
13.9 C (57.0 F)
-42.8 C (-45.0 F)
n/a
n/a
Feb
16.7 C (62.1 F)
-42.2 C (-44.0 F)
n/a
n/a
Mar
26.7 C (80.1 F)
-32.2 C (-26.0 F)
n/a
n/a
Apr
35.0 C (95.0 F)
-18.3 C (-0.9 F)
n/a
n/a
May
38.9 C (102.0 F)
-7.8 C (18.0 F)
n/a
n/a
Jun
37.8 C (100.0 F)
-3.9 C (25.0 F)
n/a
n/a
Jul
42.2 C (108.0 F)
0.6 C (33.1 F)
n/a
n/a
Aug
38.9 C (102.0 F)
-2.2 C (28.0 F)
n/a
n/a
Sep
36.7 C (98.1 F)
-8.9 C (16.0 F)
n/a
n/a
Oct
31.1 C (88.0 F)
-20.0 C (-4.0 F)
n/a
n/a
Nov
23.9 C (75.0 F)
-27.2 C (-17.0 F)
n/a
n/a
Dec
16.7 C (62.1 F)
-35.6 C (-32.1 F)
n/a
n/a
Which Years Hold Standing Records
1,464 standing records
Year with most
1,464 records at Hillsboro still stand. 1894 holds the most, with 55.
Standing records at Hillsboro by the year they were set
Year set
Standing records
1893
24
1894
55
1895
38
1896
34
1897
30
1898
17
1899
35
1900
19
1901
23
1902
20
1903
16
1904
27
1905
15
1906
18
1907
19
1908
26
1909
28
1910
24
1911
24
1912
29
1913
25
1914
18
1915
26
1916
33
1917
38
1918
25
1919
18
1920
22
1921
19
1922
14
1923
23
1924
23
1925
29
1926
13
1927
17
1928
28
1929
19
1930
34
1931
22
1932
15
1933
21
1934
24
1935
17
1936
45
1937
19
1938
13
1939
15
1940
16
1941
14
1942
22
1943
20
1944
13
1945
11
1946
17
1947
28
1948
27
1949
24
1950
21
1951
26
1952
18
1953
21
1954
9
1955
18
1956
6
1957
9
1958
8
All-Time Record Progression
5 new records
5 all-time records were set at Hillsboro between 20 August 1926 and 20 August 1947. Each dot is a new record.
When Hillsboro set new all-time records
Date
Kind
Detail
1926-08-20
Record daily precipitation
Record daily precipitation 100.3 mm (3.9 in)
1927-09-17
Record daily precipitation
Record daily precipitation 158.8 mm (6.3 in)
1936-07-14
Record high maximum temperature
Record high maximum temperature 42.2 C (108.0 F)
1942-01-01
Record daily snowfall
Record daily snowfall 38.1 cm (15.0 in)
1947-08-20
Record high minimum temperature
Record high minimum temperature 26.7 C (80.1 F)
Wettest Day of Each Month
Sep: 158.8 mm (6.3 in)
The wettest day on record for each calendar month at Hillsboro. The most was 158.8 mm (6.3 in) on 17 September 1927.
Record daily precipitation for each month at Hillsboro
Month
Record daily precipitation (mm)
Date
Jan
38.1 mm (1.5 in)
19 January 1907
Feb
76.2 mm (3.0 in)
22 February 1922
Mar
53.3 mm (2.1 in)
26 March 1906
Apr
68.1 mm (2.7 in)
18 April 1941
May
67.3 mm (2.6 in)
18 May 1908
Jun
83.8 mm (3.3 in)
1 June 1945
Jul
94.0 mm (3.7 in)
21 July 1907
Aug
100.3 mm (3.9 in)
20 August 1926
Sep
158.8 mm (6.3 in)
17 September 1927
Oct
64.8 mm (2.6 in)
19 October 1937
Nov
62.2 mm (2.4 in)
1 November 1945
Dec
38.1 mm (1.5 in)
24 December 1895
Period of Record Coverage
1893 to 1958
Complete yearUnder 90 percent of days
66 years of record at Hillsboro, 1893 to 1958. 2 years have data for under 90 percent of days and are left out of rankings: 1910, 1927.
Cooler than the station meanWarmer than the station mean
One stripe for each of 51 complete years at Hillsboro, 1893 to 1957. Blue stripes are years cooler than the station's own mean of 6.9 C (44.4 F); red stripes are warmer. The coolest year was 1917, at 3.4 C (38.2 F), and the warmest was 1931, at 9.0 C (48.1 F). The strongest colour marks a difference of 3.5 C (6.3 F).
Annual mean temperature at Hillsboro as warming stripes, 1893 to 1957
Year
Annual mean temperature
Difference from the station mean
1893
4.9 C
-1.97 C
1894
7.7 C
+0.83 C
1895
6.2 C
-0.68 C
1896
6.9 C
+0.05 C
1897
6.6 C
-0.30 C
1899
6.5 C
-0.39 C
1906
6.9 C
+0.04 C
1907
5.8 C
-1.05 C
1909
5.8 C
-1.04 C
1912
5.1 C
-1.78 C
1914
6.3 C
-0.53 C
1915
5.6 C
-1.27 C
1916
5.2 C
-1.68 C
1917
3.4 C
-3.44 C
1918
5.8 C
-1.03 C
1919
6.2 C
-0.68 C
1920
5.6 C
-1.30 C
1921
8.3 C
+1.38 C
1922
7.5 C
+0.66 C
1923
6.8 C
-0.04 C
1924
5.0 C
-1.90 C
1925
6.5 C
-0.38 C
1926
5.8 C
-1.06 C
1928
7.0 C
+0.11 C
1929
5.1 C
-1.82 C
1930
7.1 C
+0.27 C
1931
9.0 C
+2.09 C
1933
8.1 C
+1.20 C
1934
8.0 C
+1.14 C
1935
6.7 C
-0.14 C
1936
6.5 C
-0.40 C
1937
6.5 C
-0.39 C
1939
8.2 C
+1.35 C
1940
6.5 C
-0.39 C
1941
8.3 C
+1.44 C
1942
7.2 C
+0.29 C
1943
6.5 C
-0.39 C
1944
7.8 C
+0.90 C
1945
6.5 C
-0.39 C
1946
8.6 C
+1.69 C
1947
7.6 C
+0.72 C
1948
8.1 C
+1.21 C
1949
8.7 C
+1.79 C
1950
6.5 C
-0.38 C
1951
6.4 C
-0.47 C
1952
8.1 C
+1.27 C
1953
8.9 C
+2.03 C
1954
8.6 C
+1.77 C
1955
8.4 C
+1.56 C
1956
7.9 C
+1.05 C
1957
7.5 C
+0.63 C
The annual mean temperature here has risen by 0.4 C (0.2 to 0.5) per decade over 1893 to 1957. In Fahrenheit: 0.6 F (0.3 to 0.9) per decade. The slope is a straight line fitted to 51 complete years; the brackets give its 95 percent interval.
Fitted temperature trends per decade at Hillsboro
Measure
Per decade (C)
Per decade (F)
Period
Complete years
Reading
Annual mean temperature
0.4 C (0.2 to 0.5) per decade
0.6 F (0.3 to 0.9) per decade
1893 to 1957
51
Rise
Mean daily maximum
0.2 C (0.1 to 0.4) per decade
0.4 F (0.1 to 0.7) per decade
1893 to 1957
51
Rise
Mean daily minimum
0.5 C (0.3 to 0.6) per decade
0.8 F (0.5 to 1.2) per decade
1893 to 1957
51
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 1958
Yearly extremes at Hillsboro: the record and the median year
Measure
Record
Year of the record
Median year
Years with a value
Hottest day (TXx)
42.2 C (108.0 F)
1936
35.0 C (95.0 F)
66
Coldest night (TNn)
-42.8 C (-45.0 F)
1912
-33.3 C (-27.9 F)
66
Wettest day (Rx1day)
158.8 mm (6.3 in)
1927
56.6 mm (2.2 in)
66
Wettest five days (Rx5day)
161.6 mm (6.4 in)
1935
84.2 mm (3.3 in)
66
Longest dry spell (CDD)
37 days
1919
23 days
66
Hottest day (TXx)
The hottest day of the year at Hillsboro, 1893 to 1958. The record is 42.2 C (108.0 F) in 1936, marked on the chart; the median year is 35.0 C (95.0 F).
Hottest day (TXx) at Hillsboro by year
Year
Hottest day (TXx)
1893
33.3 C (91.9 F)
1894
38.9 C (102.0 F)
1895
35.6 C (96.1 F)
1896
36.7 C (98.1 F)
1897
35.0 C (95.0 F)
1898
34.4 C (93.9 F)
1899
34.4 C (93.9 F)
1900
35.0 C (95.0 F)
1901
41.1 C (106.0 F)
1902
32.8 C (91.0 F)
1903
32.8 C (91.0 F)
1904
34.4 C (93.9 F)
1905
35.0 C (95.0 F)
1906
34.4 C (93.9 F)
1907
33.9 C (93.0 F)
1908
36.1 C (97.0 F)
1909
36.1 C (97.0 F)
1910
36.7 C (98.1 F)
1911
36.7 C (98.1 F)
1912
34.4 C (93.9 F)
1913
35.0 C (95.0 F)
1914
33.3 C (91.9 F)
1915
32.2 C (90.0 F)
1916
38.3 C (100.9 F)
1917
34.4 C (93.9 F)
1918
34.4 C (93.9 F)
1919
33.3 C (91.9 F)
1920
32.8 C (91.0 F)
1921
36.7 C (98.1 F)
1922
36.7 C (98.1 F)
1923
35.6 C (96.1 F)
1924
31.7 C (89.1 F)
1925
34.4 C (93.9 F)
1926
37.2 C (99.0 F)
1927
32.8 C (91.0 F)
1928
33.9 C (93.0 F)
1929
33.3 C (91.9 F)
1930
36.7 C (98.1 F)
1931
36.7 C (98.1 F)
1932
33.9 C (93.0 F)
1933
36.7 C (98.1 F)
1934
38.9 C (102.0 F)
1935
34.4 C (93.9 F)
1936
42.2 C (108.0 F)
1937
38.9 C (102.0 F)
1938
32.8 C (91.0 F)
1939
36.7 C (98.1 F)
1940
35.6 C (96.1 F)
1941
36.7 C (98.1 F)
1942
33.3 C (91.9 F)
1943
33.3 C (91.9 F)
1944
34.4 C (93.9 F)
1945
33.9 C (93.0 F)
1946
33.9 C (93.0 F)
1947
36.1 C (97.0 F)
1948
38.9 C (102.0 F)
1949
35.6 C (96.1 F)
1950
32.8 C (91.0 F)
1951
32.2 C (90.0 F)
1952
35.0 C (95.0 F)
1953
36.7 C (98.1 F)
1954
35.0 C (95.0 F)
1955
38.9 C (102.0 F)
1956
35.0 C (95.0 F)
1957
33.3 C (91.9 F)
1958
33.9 C (93.0 F)
Coldest night (TNn)
The coldest night of the year at Hillsboro, 1893 to 1958. The record is -42.8 C (-45.0 F) in 1912, marked on the chart; the median year is -33.3 C (-27.9 F).
Coldest night (TNn) at Hillsboro by year
Year
Coldest night (TNn)
1893
-35.6 C (-32.1 F)
1894
-28.9 C (-20.0 F)
1895
-37.2 C (-35.0 F)
1896
-25.0 C (-13.0 F)
1897
-28.9 C (-20.0 F)
1898
-27.8 C (-18.0 F)
1899
-40.0 C (-40.0 F)
1900
-28.9 C (-20.0 F)
1901
-32.8 C (-27.0 F)
1902
-35.0 C (-31.0 F)
1903
-34.4 C (-29.9 F)
1904
-39.4 C (-38.9 F)
1905
-37.2 C (-35.0 F)
1906
-26.7 C (-16.1 F)
1907
-37.2 C (-35.0 F)
1908
-28.3 C (-18.9 F)
1909
-32.8 C (-27.0 F)
1910
-38.9 C (-38.0 F)
1911
-38.3 C (-36.9 F)
1912
-42.8 C (-45.0 F)
1913
-31.7 C (-25.1 F)
1914
-35.6 C (-32.1 F)
1915
-37.8 C (-36.0 F)
1916
-37.2 C (-35.0 F)
1917
-38.9 C (-38.0 F)
1918
-42.2 C (-44.0 F)
1919
-41.1 C (-42.0 F)
1920
-33.3 C (-27.9 F)
1921
-25.0 C (-13.0 F)
1922
-34.4 C (-29.9 F)
1923
-30.6 C (-23.1 F)
1924
-35.6 C (-32.1 F)
1925
-32.2 C (-26.0 F)
1926
-31.7 C (-25.1 F)
1927
-37.2 C (-35.0 F)
1928
-37.2 C (-35.0 F)
1929
-41.1 C (-42.0 F)
1930
-40.0 C (-40.0 F)
1931
-29.4 C (-20.9 F)
1932
-34.4 C (-29.9 F)
1933
-33.3 C (-27.9 F)
1934
-27.2 C (-17.0 F)
1935
-33.3 C (-27.9 F)
1936
-36.7 C (-34.1 F)
1937
-33.3 C (-27.9 F)
1938
-26.7 C (-16.1 F)
1939
-23.9 C (-11.0 F)
1940
-35.6 C (-32.1 F)
1941
-26.1 C (-15.0 F)
1942
-37.8 C (-36.0 F)
1943
-37.2 C (-35.0 F)
1944
-27.2 C (-17.0 F)
1945
-30.0 C (-22.0 F)
1946
-32.8 C (-27.0 F)
1947
-33.9 C (-29.0 F)
1948
-29.4 C (-20.9 F)
1949
-32.2 C (-26.0 F)
1950
-32.2 C (-26.0 F)
1951
-42.2 C (-44.0 F)
1952
-29.4 C (-20.9 F)
1953
-25.6 C (-14.1 F)
1954
-27.8 C (-18.0 F)
1955
-28.3 C (-18.9 F)
1956
-28.9 C (-20.0 F)
1957
-28.9 C (-20.0 F)
1958
-28.9 C (-20.0 F)
Wettest day (Rx1day)
The wettest day of the year at Hillsboro, 1893 to 1958. The record is 158.8 mm (6.3 in) in 1927, marked on the chart; the median year is 56.6 mm (2.2 in).
Wettest day (Rx1day) at Hillsboro by year
Year
Wettest day (Rx1day)
1893
39.6 mm (1.6 in)
1894
73.2 mm (2.9 in)
1895
47.8 mm (1.9 in)
1896
55.9 mm (2.2 in)
1897
42.9 mm (1.7 in)
1898
51.3 mm (2.0 in)
1899
62.2 mm (2.4 in)
1900
52.3 mm (2.1 in)
1901
64.8 mm (2.6 in)
1902
57.2 mm (2.3 in)
1903
69.9 mm (2.8 in)
1904
47.5 mm (1.9 in)
1905
42.7 mm (1.7 in)
1906
63.5 mm (2.5 in)
1907
94.0 mm (3.7 in)
1908
67.3 mm (2.6 in)
1909
76.2 mm (3.0 in)
1910
47.0 mm (1.9 in)
1911
45.5 mm (1.8 in)
1912
59.2 mm (2.3 in)
1913
65.5 mm (2.6 in)
1914
74.2 mm (2.9 in)
1915
43.9 mm (1.7 in)
1916
91.4 mm (3.6 in)
1917
51.1 mm (2.0 in)
1918
49.8 mm (2.0 in)
1919
54.6 mm (2.1 in)
1920
49.8 mm (2.0 in)
1921
76.2 mm (3.0 in)
1922
76.2 mm (3.0 in)
1923
50.8 mm (2.0 in)
1924
48.3 mm (1.9 in)
1925
82.6 mm (3.3 in)
1926
100.3 mm (3.9 in)
1927
158.8 mm (6.3 in)
1928
63.5 mm (2.5 in)
1929
48.3 mm (1.9 in)
1930
48.3 mm (1.9 in)
1931
40.6 mm (1.6 in)
1932
67.6 mm (2.7 in)
1933
71.6 mm (2.8 in)
1934
90.2 mm (3.6 in)
1935
99.1 mm (3.9 in)
1936
43.2 mm (1.7 in)
1937
64.8 mm (2.6 in)
1938
59.7 mm (2.4 in)
1939
50.8 mm (2.0 in)
1940
67.1 mm (2.6 in)
1941
68.1 mm (2.7 in)
1942
43.2 mm (1.7 in)
1943
71.4 mm (2.8 in)
1944
34.3 mm (1.4 in)
1945
83.8 mm (3.3 in)
1946
77.0 mm (3.0 in)
1947
58.9 mm (2.3 in)
1948
31.5 mm (1.2 in)
1949
43.9 mm (1.7 in)
1950
66.0 mm (2.6 in)
1951
71.4 mm (2.8 in)
1952
39.1 mm (1.5 in)
1953
37.1 mm (1.5 in)
1954
42.2 mm (1.7 in)
1955
38.6 mm (1.5 in)
1956
36.8 mm (1.4 in)
1957
43.9 mm (1.7 in)
1958
39.1 mm (1.5 in)
Wettest five days (Rx5day)
The wettest five days of the year at Hillsboro, 1893 to 1958. The record is 161.6 mm (6.4 in) in 1935, marked on the chart; the median year is 84.2 mm (3.3 in).
Wettest five days (Rx5day) at Hillsboro by year
Year
Wettest five days (Rx5day)
1893
66.2 mm (2.6 in)
1894
79.0 mm (3.1 in)
1895
43.2 mm (1.7 in)
1896
81.1 mm (3.2 in)
1897
84.1 mm (3.3 in)
1898
67.3 mm (2.6 in)
1899
99.5 mm (3.9 in)
1900
98.9 mm (3.9 in)
1901
91.0 mm (3.6 in)
1902
96.6 mm (3.8 in)
1903
92.5 mm (3.6 in)
1904
74.2 mm (2.9 in)
1905
70.1 mm (2.8 in)
1906
92.7 mm (3.6 in)
1907
94.0 mm (3.7 in)
1908
101.6 mm (4.0 in)
1909
95.3 mm (3.8 in)
1910
52.1 mm (2.1 in)
1911
71.1 mm (2.8 in)
1912
81.4 mm (3.2 in)
1913
92.5 mm (3.6 in)
1914
87.0 mm (3.4 in)
1915
101.9 mm (4.0 in)
1916
65.6 mm (2.6 in)
1917
76.6 mm (3.0 in)
1918
97.6 mm (3.8 in)
1919
65.2 mm (2.6 in)
1920
122.2 mm (4.8 in)
1921
80.8 mm (3.2 in)
1922
94.0 mm (3.7 in)
1923
76.2 mm (3.0 in)
1924
75.5 mm (3.0 in)
1925
120.2 mm (4.7 in)
1926
107.2 mm (4.2 in)
1927
69.2 mm (2.7 in)
1928
86.9 mm (3.4 in)
1929
65.5 mm (2.6 in)
1930
72.3 mm (2.8 in)
1931
65.5 mm (2.6 in)
1932
79.4 mm (3.1 in)
1933
86.3 mm (3.4 in)
1934
90.7 mm (3.6 in)
1935
161.6 mm (6.4 in)
1936
63.0 mm (2.5 in)
1937
86.9 mm (3.4 in)
1938
106.0 mm (4.2 in)
1939
78.7 mm (3.1 in)
1940
110.3 mm (4.3 in)
1941
113.1 mm (4.5 in)
1942
84.3 mm (3.3 in)
1943
95.0 mm (3.7 in)
1944
82.6 mm (3.3 in)
1945
133.4 mm (5.3 in)
1946
118.9 mm (4.7 in)
1947
84.5 mm (3.3 in)
1948
62.8 mm (2.5 in)
1949
66.0 mm (2.6 in)
1950
110.7 mm (4.4 in)
1951
99.4 mm (3.9 in)
1952
73.4 mm (2.9 in)
1953
97.8 mm (3.9 in)
1954
77.5 mm (3.1 in)
1955
63.5 mm (2.5 in)
1956
59.7 mm (2.4 in)
1957
54.8 mm (2.2 in)
1958
40.4 mm (1.6 in)
Longest dry spell (CDD)
The longest dry spell of the year at Hillsboro, 1893 to 1958. The record is 37 days in 1919, marked on the chart; the median year is 23 days.
Longest dry spell (CDD) at Hillsboro by year
Year
Longest dry spell (CDD)
1893
35 days
1894
18 days
1895
22 days
1896
24 days
1897
24 days
1898
16 days
1899
18 days
1900
26 days
1901
20 days
1902
20 days
1903
35 days
1904
16 days
1905
17 days
1906
19 days
1907
25 days
1908
22 days
1909
28 days
1910
27 days
1911
28 days
1912
24 days
1913
22 days
1914
20 days
1915
19 days
1916
35 days
1917
27 days
1918
22 days
1919
37 days
1920
23 days
1921
16 days
1922
31 days
1923
17 days
1924
25 days
1925
32 days
1926
23 days
1927
20 days
1928
23 days
1929
22 days
1930
29 days
1931
21 days
1932
21 days
1933
13 days
1934
28 days
1935
15 days
1936
20 days
1937
24 days
1938
25 days
1939
17 days
1940
20 days
1941
17 days
1942
29 days
1943
27 days
1944
25 days
1945
16 days
1946
18 days
1947
21 days
1948
22 days
1949
28 days
1950
25 days
1951
17 days
1952
30 days
1953
30 days
1954
23 days
1955
18 days
1956
21 days
1957
29 days
1958
31 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
51 years with a frost
Across 51 years with a frost, the median last spring frost at Hillsboro falls on 16 May and the median first autumn frost on 25 September, which leaves a median of 131 days between them.
Fitted over all years, the growing season changes by +3.6 days per decade at this station.
Frost dates and growing season at Hillsboro
Measure
Median, all years
Earliest period
Recent period (1925 to 1957)
Recent against earliest
Fitted trend
Last spring frost
16 May
n/a
14 May
n/a
-1.8 days per decade
First autumn frost
25 September
n/a
26 September
n/a
+1.7 days per decade
Growing days
131 days
n/a
134 days
n/a
+3.6 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
47 years, 1896 to 1958
A day with at least 54.7 mm (2.2 in) of rain is expected about once in 2 years. A day with at least 98.1 mm (3.9 in) of rain is expected about once in 100 years.
Rainfall return levels at Hillsboro: the daily rain expected about once in a given number of years
Expected about once in
A day with at least
Note
2 years
54.7 mm (2.2 in)
5 years
68.4 mm (2.7 in)
10 years
76.5 mm (3.0 in)
25 years
85.9 mm (3.4 in)
50 years
92.3 mm (3.6 in)
Longer than the 47 years of record
100 years
98.1 mm (3.9 in)
Longer than the 47 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, 47 years of values from 1896 to 1958.
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: 94.0 mm (3.7 in) in 1907; 83.8 mm (3.3 in) in 1945; 82.6 mm (3.3 in) in 1925.
Station Changes
3 suspected
3 changes were suspected in the annual mean temperature of Hillsboro, at 1914, 1933 and 1946. Each is measured against neighbouring stations.
Relative to 5 neighbouring stations, the station's annual mean temperature from 1914 ran 0.4 C (0.6 F) lower than in the years before (possible change).
Relative to 5 neighbouring stations, the station's annual mean temperature from 1933 ran 0.6 C (1.0 F) higher than in the years before (likely change).
Relative to 5 neighbouring stations, the station's annual mean temperature from 1946 ran 0.5 C (0.9 F) higher than in the years before (likely change).
Suspected changes in the annual mean temperature at Hillsboro, against neighbouring stations
Year
Shift (C)
Shift (F)
Strength
Neighbours
1914
-0.3
-0.6
possible
5
1933
+0.6
+1.0
likely
5
1946
+0.5
+0.9
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 Hillsboro standing records by year: CSV or JSON. Field meanings are on the data page.
Data for Hillsboro 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.