Waterloo Weather Records (USC00138704)
Record envelope, standing records and threshold days for Waterloo (USC00138704), Iowa, United States, with 56 years of record.
Key Facts for Waterloo
- Waterloo (USC00138704) is a weather station in Iowa, United States at 42.52 latitude and -92.33 longitude, 256 m (840 ft) above sea level.
- The station reports from 1895 to 1950, 56 years of record.
- 1,464 records set at Waterloo still stand.
- Records are tracked for tmax, tmin, prcp, snow, snwd: an element needs 30 years of data to be eligible.
- Waterloo set a daily record low maximum temperature of -12.2 C (10.0 F) on 25 February 1950.
About the Station
- Location: Iowa, United States, 42.52 latitude, -92.33 longitude.
- Elevation: 256 m (840 ft).
- Period of record: 1895 to 1950, 56 years.
- Eligible elements: tmax, tmin, prcp, snow, snwd.
Daily Record Envelope and 2026
0 days at or beyond a record| Month | Highest record high | Lowest record low | 2026 highest maximum | 2026 lowest minimum |
|---|---|---|---|---|
| Jan | 16.1 C (61.0 F) | -36.1 C (-33.0 F) | n/a | n/a |
| Feb | 21.7 C (71.1 F) | -34.4 C (-29.9 F) | n/a | n/a |
| Mar | 30.0 C (86.0 F) | -27.8 C (-18.0 F) | n/a | n/a |
| Apr | 35.0 C (95.0 F) | -10.6 C (12.9 F) | n/a | n/a |
| May | 42.2 C (108.0 F) | -5.6 C (21.9 F) | n/a | n/a |
| Jun | 41.7 C (107.1 F) | 0.6 C (33.1 F) | n/a | n/a |
| Jul | 44.4 C (111.9 F) | 6.1 C (43.0 F) | n/a | n/a |
| Aug | 43.3 C (109.9 F) | 1.1 C (34.0 F) | n/a | n/a |
| Sep | 38.9 C (102.0 F) | -7.2 C (19.0 F) | n/a | n/a |
| Oct | 35.0 C (95.0 F) | -17.8 C (0.0 F) | n/a | n/a |
| Nov | 28.3 C (82.9 F) | -22.8 C (-9.0 F) | n/a | n/a |
| Dec | 18.3 C (64.9 F) | -33.9 C (-29.0 F) | n/a | n/a |
Which Years Hold Standing Records
1,464 standing records| Year set | Standing records |
|---|---|
| 1895 | 28 |
| 1896 | 25 |
| 1897 | 37 |
| 1898 | 27 |
| 1899 | 30 |
| 1900 | 19 |
| 1901 | 35 |
| 1902 | 28 |
| 1903 | 20 |
| 1904 | 21 |
| 1905 | 12 |
| 1906 | 11 |
| 1907 | 23 |
| 1908 | 20 |
| 1909 | 31 |
| 1910 | 21 |
| 1911 | 34 |
| 1912 | 31 |
| 1913 | 32 |
| 1914 | 26 |
| 1915 | 27 |
| 1916 | 31 |
| 1917 | 48 |
| 1918 | 35 |
| 1919 | 13 |
| 1920 | 26 |
| 1921 | 30 |
| 1922 | 18 |
| 1923 | 17 |
| 1924 | 25 |
| 1925 | 41 |
| 1926 | 23 |
| 1927 | 17 |
| 1928 | 36 |
| 1929 | 18 |
| 1930 | 51 |
| 1931 | 41 |
| 1932 | 22 |
| 1933 | 27 |
| 1934 | 41 |
| 1935 | 24 |
| 1936 | 61 |
| 1937 | 22 |
| 1938 | 20 |
| 1939 | 19 |
| 1940 | 26 |
| 1941 | 17 |
| 1942 | 22 |
| 1943 | 24 |
| 1944 | 24 |
| 1945 | 19 |
| 1946 | 27 |
| 1947 | 22 |
| 1948 | 24 |
| 1949 | 12 |
| 1950 | 3 |
All-Time Record Progression
5 new records| Date | Kind | Detail |
|---|---|---|
| 1930-01-22 | Record low minimum temperature | Record low minimum temperature -36.1 C (-33.0 F) |
| 1936-02-17 | Record snow depth | Record snow depth 63.5 cm (25.0 in) |
| 1936-07-12 | Record high maximum temperature | Record high maximum temperature 43.3 C (109.9 F) |
| 1936-07-13 | Record high maximum temperature | Record high maximum temperature 44.4 C (111.9 F) |
| 1942-07-30 | Record daily precipitation | Record daily precipitation 133.4 mm (5.3 in) |
Wettest Day of Each Month
Jul: 133.4 mm (5.3 in)| Month | Record daily precipitation (mm) | Date |
|---|---|---|
| Jan | 45.0 mm (1.8 in) | 3 January 1906 |
| Feb | 45.7 mm (1.8 in) | 28 February 1948 |
| Mar | 47.0 mm (1.9 in) | 29 March 1933 |
| Apr | 45.5 mm (1.8 in) | 18 April 1909 |
| May | 64.0 mm (2.5 in) | 27 May 1903 |
| Jun | 100.3 mm (3.9 in) | 13 June 1947 |
| Jul | 133.4 mm (5.3 in) | 30 July 1942 |
| Aug | 101.6 mm (4.0 in) | 19 August 1912 |
| Sep | 114.3 mm (4.5 in) | 19 September 1919 |
| Oct | 59.7 mm (2.4 in) | 31 October 1900 |
| Nov | 64.8 mm (2.6 in) | 5 November 1938 |
| Dec | 23.4 mm (0.9 in) | 10 December 1911 |
Period of Record Coverage
1895 to 1950| Year | Days with data | Share of year | Complete |
|---|---|---|---|
| 1895 | 345 | 95% | Yes |
| 1896 | 366 | 100% | Yes |
| 1897 | 364 | 100% | Yes |
| 1898 | 364 | 100% | Yes |
| 1899 | 365 | 100% | Yes |
| 1900 | 365 | 100% | Yes |
| 1901 | 363 | 99% | Yes |
| 1902 | 365 | 100% | Yes |
| 1903 | 365 | 100% | Yes |
| 1904 | 366 | 100% | Yes |
| 1905 | 365 | 100% | Yes |
| 1906 | 365 | 100% | Yes |
| 1907 | 365 | 100% | Yes |
| 1908 | 366 | 100% | Yes |
| 1909 | 365 | 100% | Yes |
| 1910 | 365 | 100% | Yes |
| 1911 | 360 | 99% | Yes |
| 1912 | 362 | 99% | Yes |
| 1913 | 365 | 100% | Yes |
| 1914 | 365 | 100% | Yes |
| 1915 | 365 | 100% | Yes |
| 1916 | 366 | 100% | Yes |
| 1917 | 365 | 100% | Yes |
| 1918 | 365 | 100% | Yes |
| 1919 | 361 | 99% | Yes |
| 1920 | 365 | 100% | Yes |
| 1921 | 365 | 100% | Yes |
| 1922 | 363 | 99% | Yes |
| 1923 | 364 | 100% | Yes |
| 1924 | 366 | 100% | Yes |
| 1925 | 365 | 100% | Yes |
| 1926 | 365 | 100% | Yes |
| 1927 | 365 | 100% | Yes |
| 1928 | 366 | 100% | Yes |
| 1929 | 364 | 100% | Yes |
| 1930 | 365 | 100% | Yes |
| 1931 | 365 | 100% | Yes |
| 1932 | 366 | 100% | Yes |
| 1933 | 365 | 100% | Yes |
| 1934 | 365 | 100% | Yes |
| 1935 | 365 | 100% | Yes |
| 1936 | 366 | 100% | Yes |
| 1937 | 365 | 100% | Yes |
| 1938 | 365 | 100% | Yes |
| 1939 | 365 | 100% | Yes |
| 1940 | 366 | 100% | Yes |
| 1941 | 365 | 100% | Yes |
| 1942 | 365 | 100% | Yes |
| 1943 | 364 | 100% | Yes |
| 1944 | 365 | 100% | Yes |
| 1945 | 364 | 100% | Yes |
| 1946 | 365 | 100% | Yes |
| 1947 | 365 | 100% | Yes |
| 1948 | 365 | 100% | Yes |
| 1949 | 365 | 100% | Yes |
| 1950 | 59 | 16% | No |
Latest Records
20| Date | Station | Record | Value | Beat old record by | Old record stood | Significance |
|---|---|---|---|---|---|---|
| 25 February 1950 | Waterloo, US | daily low max | -12.2 C (10.0 F) | 1.1 C (2.0 F) | 16 years | 10 of 100 (Routine) |
| 24 February 1950 | Waterloo, US | daily low min | -23.9 C (-11.0 F) | 0.6 C (1.1 F) | 40 years | 17 of 100 (Routine) |
| 14 February 1950 | Waterloo, US | daily snowfall | 8.9 cm (3.5 in) | 6.4 cm (2.5 in) | 49 years | 35 of 100 (Notable) |
| 26 January 1950 | Waterloo, US | daily rain | 19.1 mm (0.8 in) | 12.7 mm (0.5 in) | 8 years | 20 of 100 (Routine) |
| 26 January 1950 | Waterloo, US | daily snowfall | 12.7 cm (5.0 in) | 6.3 cm (2.5 in) | 8 years | 18 of 100 (Routine) |
| 13 January 1950 | Waterloo, US | daily rain | 12.7 mm (0.5 in) | 6.3 mm (0.25 in) | 15 years | 18 of 100 (Routine) |
| 2 January 1950 | Waterloo, US | daily high min | 1.7 C (35.1 F) | 4.5 C (8.1 F) | 47 years | 24 of 100 (Routine) |
| 27 December 1949 | Waterloo, US | daily rain | 0.3 mm (0.01 in) | 0.3 mm (0.01 in) | 53 years | 20 of 100 (Routine) |
| 27 December 1949 | Waterloo, US | daily snowfall | 0.3 cm (0.1 in) | 0.3 cm (0.1 in) | 53 years | 20 of 100 (Routine) |
| 23 December 1949 | Waterloo, US | daily low min (Tie) | -23.3 C (-9.9 F) | tie | 51 years | 5 of 100 (Routine) |
| 22 December 1949 | Waterloo, US | daily snowfall | 5.1 cm (2.0 in) | 3.1 cm (1.2 in) | 28 years | 21 of 100 (Routine) |
| 22 December 1949 | Waterloo, US | daily rain | 5.1 mm (0.20 in) | 1.3 mm (0.05 in) | 39 years | 18 of 100 (Routine) |
| 2 December 1949 | Waterloo, US | daily snowfall | 1.8 cm (0.7 in) | 1.5 cm (0.6 in) | 30 years | 18 of 100 (Routine) |
| 24 November 1949 | Waterloo, US | daily snowfall | 1.0 cm (0.4 in) | 1.0 cm (0.4 in) | 52 years | 20 of 100 (Routine) |
| 17 November 1949 | Waterloo, US | daily snowfall | 2.5 cm (1.0 in) | 2.5 cm (1.0 in) | 53 years | 20 of 100 (Routine) |
| 20 October 1949 | Waterloo, US | daily high min | 14.4 C (57.9 F) | 0.5 C (0.9 F) | 8 years | 7 of 100 (Routine) |
| 10 October 1949 | Waterloo, US | daily high min (Tie) | 16.7 C (62.1 F) | tie | 19 years | 2 of 100 (Routine) |
| 8 October 1949 | Waterloo, US | monthly high min (Tie) | 19.4 C (66.9 F) | tie | 51 years | 7 of 100 (Routine) |
| 29 September 1949 | Waterloo, US | daily low min | -3.3 C (26.1 F) | 1.1 C (2.0 F) | 40 years | 18 of 100 (Routine) |
| 8 September 1949 | Waterloo, US | daily low min | 4.4 C (39.9 F) | 1.7 C (3.1 F) | 15 years | 12 of 100 (Routine) |
Climate Trend
54 complete years, 1896 to 1949| Year | Annual mean temperature | Difference from the station mean |
|---|---|---|
| 1896 | 8.7 C | -0.14 C |
| 1897 | 8.0 C | -0.80 C |
| 1898 | 8.3 C | -0.54 C |
| 1899 | 8.2 C | -0.59 C |
| 1900 | 9.1 C | +0.29 C |
| 1901 | 9.0 C | +0.15 C |
| 1902 | 8.3 C | -0.50 C |
| 1903 | 8.1 C | -0.71 C |
| 1904 | 7.7 C | -1.16 C |
| 1905 | 8.3 C | -0.58 C |
| 1906 | 8.9 C | +0.10 C |
| 1907 | 8.5 C | -0.29 C |
| 1908 | 9.7 C | +0.82 C |
| 1909 | 8.3 C | -0.57 C |
| 1910 | 8.8 C | -0.04 C |
| 1911 | 8.9 C | +0.08 C |
| 1912 | 7.0 C | -1.85 C |
| 1913 | 9.2 C | +0.39 C |
| 1914 | 8.8 C | -0.07 C |
| 1915 | 7.9 C | -0.89 C |
| 1916 | 7.8 C | -1.08 C |
| 1917 | 5.9 C | -2.89 C |
| 1918 | 8.4 C | -0.41 C |
| 1919 | 8.8 C | -0.06 C |
| 1920 | 8.7 C | -0.17 C |
| 1921 | 10.8 C | +2.01 C |
| 1922 | 9.8 C | +0.95 C |
| 1923 | 9.3 C | +0.51 C |
| 1924 | 7.8 C | -1.03 C |
| 1925 | 9.1 C | +0.26 C |
| 1926 | 8.7 C | -0.10 C |
| 1927 | 9.2 C | +0.33 C |
| 1928 | 9.3 C | +0.49 C |
| 1929 | 7.5 C | -1.37 C |
| 1930 | 9.5 C | +0.69 C |
| 1931 | 11.7 C | +2.85 C |
| 1932 | 8.8 C | -0.06 C |
| 1933 | 10.0 C | +1.17 C |
| 1934 | 10.3 C | +1.42 C |
| 1935 | 8.8 C | -0.08 C |
| 1936 | 8.6 C | -0.22 C |
| 1937 | 8.2 C | -0.67 C |
| 1938 | 10.3 C | +1.44 C |
| 1939 | 10.3 C | +1.47 C |
| 1940 | 8.6 C | -0.26 C |
| 1941 | 10.2 C | +1.41 C |
| 1942 | 8.7 C | -0.10 C |
| 1943 | 8.2 C | -0.60 C |
| 1944 | 9.2 C | +0.34 C |
| 1945 | 8.3 C | -0.55 C |
| 1946 | 9.7 C | +0.83 C |
| 1947 | 8.9 C | +0.04 C |
| 1948 | 9.1 C | +0.25 C |
| 1949 | 9.0 C | +0.15 C |
The annual mean temperature here has risen by 0.20 C (0.04 to 0.36) per decade over 1896 to 1949. In Fahrenheit: 0.4 F (0.1 to 0.6) per decade. The slope is a straight line fitted to 54 complete years; the brackets give its 95 percent interval.
| Measure | Per decade (C) | Per decade (F) | Period | Complete years | Reading |
|---|---|---|---|---|---|
| Annual mean temperature | 0.20 C (0.04 to 0.36) per decade | 0.4 F (0.1 to 0.6) per decade | 1896 to 1949 | 54 | Rise |
| Mean daily maximum | 0.14 C (-0.03 to 0.32) per decade | 0.3 F (-0.1 to 0.6) per decade | 1896 to 1949 | 54 | Not clearly different from zero |
| Mean daily minimum | 0.3 C (0.1 to 0.4) per decade | 0.5 F (0.2 to 0.7) per decade | 1896 to 1949 | 54 | 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
1895 to 1950| Measure | Record | Year of the record | Median year | Years with a value |
|---|---|---|---|---|
| Hottest day (TXx) | 44.4 C (111.9 F) | 1936 | 37.2 C (99.0 F) | 56 |
| Coldest night (TNn) | -36.1 C (-33.0 F) | 1930 | -28.9 C (-20.0 F) | 56 |
| Wettest day (Rx1day) | 133.4 mm (5.3 in) | 1942 | 47.1 mm (1.9 in) | 56 |
| Wettest five days (Rx5day) | 176.0 mm (6.9 in) | 1942 | 61.5 mm (2.4 in) | 56 |
| Longest dry spell (CDD) | 34 days | 1947 | 21 days | 56 |
Hottest day (TXx)
| Year | Hottest day (TXx) |
|---|---|
| 1895 | 37.8 C (100.0 F) |
| 1896 | 36.1 C (97.0 F) |
| 1897 | 37.8 C (100.0 F) |
| 1898 | 36.1 C (97.0 F) |
| 1899 | 36.1 C (97.0 F) |
| 1900 | 35.0 C (95.0 F) |
| 1901 | 41.7 C (107.1 F) |
| 1902 | 34.4 C (93.9 F) |
| 1903 | 35.0 C (95.0 F) |
| 1904 | 36.7 C (98.1 F) |
| 1905 | 37.2 C (99.0 F) |
| 1906 | 35.0 C (95.0 F) |
| 1907 | 35.0 C (95.0 F) |
| 1908 | 37.2 C (99.0 F) |
| 1909 | 36.7 C (98.1 F) |
| 1910 | 37.2 C (99.0 F) |
| 1911 | 42.8 C (109.0 F) |
| 1912 | 36.1 C (97.0 F) |
| 1913 | 37.8 C (100.0 F) |
| 1914 | 38.3 C (100.9 F) |
| 1915 | 32.2 C (90.0 F) |
| 1916 | 40.0 C (104.0 F) |
| 1917 | 38.9 C (102.0 F) |
| 1918 | 40.0 C (104.0 F) |
| 1919 | 38.3 C (100.9 F) |
| 1920 | 36.1 C (97.0 F) |
| 1921 | 38.3 C (100.9 F) |
| 1922 | 38.9 C (102.0 F) |
| 1923 | 38.3 C (100.9 F) |
| 1924 | 35.6 C (96.1 F) |
| 1925 | 38.3 C (100.9 F) |
| 1926 | 39.4 C (102.9 F) |
| 1927 | 37.8 C (100.0 F) |
| 1928 | 35.0 C (95.0 F) |
| 1929 | 35.0 C (95.0 F) |
| 1930 | 40.6 C (105.1 F) |
| 1931 | 41.1 C (106.0 F) |
| 1932 | 37.2 C (99.0 F) |
| 1933 | 39.4 C (102.9 F) |
| 1934 | 42.2 C (108.0 F) |
| 1935 | 37.8 C (100.0 F) |
| 1936 | 44.4 C (111.9 F) |
| 1937 | 40.6 C (105.1 F) |
| 1938 | 36.7 C (98.1 F) |
| 1939 | 38.9 C (102.0 F) |
| 1940 | 40.0 C (104.0 F) |
| 1941 | 36.7 C (98.1 F) |
| 1942 | 35.0 C (95.0 F) |
| 1943 | 37.2 C (99.0 F) |
| 1944 | 34.4 C (93.9 F) |
| 1945 | 35.0 C (95.0 F) |
| 1946 | 34.4 C (93.9 F) |
| 1947 | 36.7 C (98.1 F) |
| 1948 | 37.2 C (99.0 F) |
| 1949 | 34.4 C (93.9 F) |
| 1950 | 7.8 C (46.0 F) |
Coldest night (TNn)
| Year | Coldest night (TNn) |
|---|---|
| 1895 | -31.1 C (-24.0 F) |
| 1896 | -25.6 C (-14.1 F) |
| 1897 | -30.0 C (-22.0 F) |
| 1898 | -26.1 C (-15.0 F) |
| 1899 | -32.8 C (-27.0 F) |
| 1900 | -24.4 C (-11.9 F) |
| 1901 | -29.4 C (-20.9 F) |
| 1902 | -30.6 C (-23.1 F) |
| 1903 | -26.7 C (-16.1 F) |
| 1904 | -31.7 C (-25.1 F) |
| 1905 | -32.8 C (-27.0 F) |
| 1906 | -27.2 C (-17.0 F) |
| 1907 | -27.8 C (-18.0 F) |
| 1908 | -23.3 C (-9.9 F) |
| 1909 | -28.9 C (-20.0 F) |
| 1910 | -31.7 C (-25.1 F) |
| 1911 | -27.8 C (-18.0 F) |
| 1912 | -35.6 C (-32.1 F) |
| 1913 | -25.0 C (-13.0 F) |
| 1914 | -33.3 C (-27.9 F) |
| 1915 | -33.9 C (-29.0 F) |
| 1916 | -32.2 C (-26.0 F) |
| 1917 | -31.7 C (-25.1 F) |
| 1918 | -34.4 C (-29.9 F) |
| 1919 | -33.9 C (-29.0 F) |
| 1920 | -26.1 C (-15.0 F) |
| 1921 | -25.6 C (-14.1 F) |
| 1922 | -28.9 C (-20.0 F) |
| 1923 | -27.2 C (-17.0 F) |
| 1924 | -32.2 C (-26.0 F) |
| 1925 | -30.6 C (-23.1 F) |
| 1926 | -26.1 C (-15.0 F) |
| 1927 | -25.0 C (-13.0 F) |
| 1928 | -27.2 C (-17.0 F) |
| 1929 | -31.7 C (-25.1 F) |
| 1930 | -36.1 C (-33.0 F) |
| 1931 | -23.9 C (-11.0 F) |
| 1932 | -28.9 C (-20.0 F) |
| 1933 | -33.3 C (-27.9 F) |
| 1934 | -25.0 C (-13.0 F) |
| 1935 | -30.6 C (-23.1 F) |
| 1936 | -33.9 C (-29.0 F) |
| 1937 | -27.2 C (-17.0 F) |
| 1938 | -25.6 C (-14.1 F) |
| 1939 | -22.8 C (-9.0 F) |
| 1940 | -28.9 C (-20.0 F) |
| 1941 | -24.4 C (-11.9 F) |
| 1942 | -32.2 C (-26.0 F) |
| 1943 | -30.0 C (-22.0 F) |
| 1944 | -27.8 C (-18.0 F) |
| 1945 | -26.1 C (-15.0 F) |
| 1946 | -26.7 C (-16.1 F) |
| 1947 | -29.4 C (-20.9 F) |
| 1948 | -27.8 C (-18.0 F) |
| 1949 | -28.9 C (-20.0 F) |
| 1950 | -25.6 C (-14.1 F) |
Wettest day (Rx1day)
| Year | Wettest day (Rx1day) |
|---|---|
| 1895 | 31.2 mm (1.2 in) |
| 1896 | 49.5 mm (1.9 in) |
| 1897 | 39.4 mm (1.6 in) |
| 1898 | 54.6 mm (2.1 in) |
| 1899 | 70.1 mm (2.8 in) |
| 1900 | 59.7 mm (2.4 in) |
| 1901 | 23.6 mm (0.9 in) |
| 1902 | 82.8 mm (3.3 in) |
| 1903 | 70.6 mm (2.8 in) |
| 1904 | 58.7 mm (2.3 in) |
| 1905 | 61.7 mm (2.4 in) |
| 1906 | 45.0 mm (1.8 in) |
| 1907 | 39.1 mm (1.5 in) |
| 1908 | 34.3 mm (1.4 in) |
| 1909 | 60.5 mm (2.4 in) |
| 1910 | 43.4 mm (1.7 in) |
| 1911 | 34.5 mm (1.4 in) |
| 1912 | 101.6 mm (4.0 in) |
| 1913 | 50.8 mm (2.0 in) |
| 1914 | 40.6 mm (1.6 in) |
| 1915 | 101.6 mm (4.0 in) |
| 1916 | 30.5 mm (1.2 in) |
| 1917 | 43.9 mm (1.7 in) |
| 1918 | 41.9 mm (1.6 in) |
| 1919 | 114.3 mm (4.5 in) |
| 1920 | 35.1 mm (1.4 in) |
| 1921 | 50.8 mm (2.0 in) |
| 1922 | 40.9 mm (1.6 in) |
| 1923 | 37.3 mm (1.5 in) |
| 1924 | 39.4 mm (1.6 in) |
| 1925 | 47.2 mm (1.9 in) |
| 1926 | 42.2 mm (1.7 in) |
| 1927 | 40.9 mm (1.6 in) |
| 1928 | 91.4 mm (3.6 in) |
| 1929 | 31.0 mm (1.2 in) |
| 1930 | 49.0 mm (1.9 in) |
| 1931 | 58.7 mm (2.3 in) |
| 1932 | 28.2 mm (1.1 in) |
| 1933 | 47.0 mm (1.9 in) |
| 1934 | 41.9 mm (1.6 in) |
| 1935 | 50.8 mm (2.0 in) |
| 1936 | 58.4 mm (2.3 in) |
| 1937 | 34.5 mm (1.4 in) |
| 1938 | 64.8 mm (2.6 in) |
| 1939 | 19.6 mm (0.8 in) |
| 1940 | 49.5 mm (1.9 in) |
| 1941 | 47.8 mm (1.9 in) |
| 1942 | 133.4 mm (5.3 in) |
| 1943 | 33.8 mm (1.3 in) |
| 1944 | 34.8 mm (1.4 in) |
| 1945 | 29.7 mm (1.2 in) |
| 1946 | 55.1 mm (2.2 in) |
| 1947 | 100.3 mm (3.9 in) |
| 1948 | 78.0 mm (3.1 in) |
| 1949 | 48.3 mm (1.9 in) |
| 1950 | 19.1 mm (0.8 in) |
Wettest five days (Rx5day)
| Year | Wettest five days (Rx5day) |
|---|---|
| 1895 | 69.6 mm (2.7 in) |
| 1896 | 56.9 mm (2.2 in) |
| 1897 | 39.4 mm (1.6 in) |
| 1898 | 57.6 mm (2.3 in) |
| 1899 | 96.3 mm (3.8 in) |
| 1900 | 78.8 mm (3.1 in) |
| 1901 | 18.8 mm (0.7 in) |
| 1902 | 100.6 mm (4.0 in) |
| 1903 | 105.4 mm (4.1 in) |
| 1904 | 78.5 mm (3.1 in) |
| 1905 | 70.2 mm (2.8 in) |
| 1906 | 50.6 mm (2.0 in) |
| 1907 | 65.2 mm (2.6 in) |
| 1908 | 68.3 mm (2.7 in) |
| 1909 | 35.6 mm (1.4 in) |
| 1910 | 17.5 mm (0.7 in) |
| 1911 | 46.3 mm (1.8 in) |
| 1912 | 102.4 mm (4.0 in) |
| 1913 | 64.0 mm (2.5 in) |
| 1914 | 60.0 mm (2.4 in) |
| 1915 | 115.9 mm (4.6 in) |
| 1916 | 32.0 mm (1.3 in) |
| 1917 | 112.5 mm (4.4 in) |
| 1918 | 71.1 mm (2.8 in) |
| 1919 | 66.5 mm (2.6 in) |
| 1920 | 48.8 mm (1.9 in) |
| 1921 | 51.4 mm (2.0 in) |
| 1922 | 63.0 mm (2.5 in) |
| 1923 | 46.0 mm (1.8 in) |
| 1924 | 12.7 mm (0.5 in) |
| 1925 | 42.2 mm (1.7 in) |
| 1926 | 59.0 mm (2.3 in) |
| 1927 | 87.1 mm (3.4 in) |
| 1928 | 33.0 mm (1.3 in) |
| 1929 | 31.0 mm (1.2 in) |
| 1930 | 49.3 mm (1.9 in) |
| 1931 | 91.8 mm (3.6 in) |
| 1932 | 28.2 mm (1.1 in) |
| 1933 | 107.0 mm (4.2 in) |
| 1934 | 48.6 mm (1.9 in) |
| 1935 | 83.7 mm (3.3 in) |
| 1936 | 89.6 mm (3.5 in) |
| 1937 | 47.0 mm (1.9 in) |
| 1938 | 58.2 mm (2.3 in) |
| 1939 | 30.8 mm (1.2 in) |
| 1940 | 44.5 mm (1.8 in) |
| 1941 | 79.0 mm (3.1 in) |
| 1942 | 176.0 mm (6.9 in) |
| 1943 | 33.8 mm (1.3 in) |
| 1944 | 66.1 mm (2.6 in) |
| 1945 | 47.6 mm (1.9 in) |
| 1946 | 81.5 mm (3.2 in) |
| 1947 | 69.9 mm (2.8 in) |
| 1948 | 81.1 mm (3.2 in) |
| 1949 | 64.8 mm (2.6 in) |
| 1950 | 21.1 mm (0.8 in) |
Longest dry spell (CDD)
| Year | Longest dry spell (CDD) |
|---|---|
| 1895 | 15 days |
| 1896 | 23 days |
| 1897 | 22 days |
| 1898 | 15 days |
| 1899 | 14 days |
| 1900 | 17 days |
| 1901 | 19 days |
| 1902 | 18 days |
| 1903 | 20 days |
| 1904 | 21 days |
| 1905 | 21 days |
| 1906 | 27 days |
| 1907 | 14 days |
| 1908 | 24 days |
| 1909 | 12 days |
| 1910 | 29 days |
| 1911 | 13 days |
| 1912 | 20 days |
| 1913 | 20 days |
| 1914 | 30 days |
| 1915 | 18 days |
| 1916 | 29 days |
| 1917 | 18 days |
| 1918 | 21 days |
| 1919 | 27 days |
| 1920 | 15 days |
| 1921 | 13 days |
| 1922 | 18 days |
| 1923 | 19 days |
| 1924 | 17 days |
| 1925 | 21 days |
| 1926 | 16 days |
| 1927 | 19 days |
| 1928 | 18 days |
| 1929 | 24 days |
| 1930 | 24 days |
| 1931 | 31 days |
| 1932 | 22 days |
| 1933 | 25 days |
| 1934 | 26 days |
| 1935 | 24 days |
| 1936 | 22 days |
| 1937 | 18 days |
| 1938 | 18 days |
| 1939 | 24 days |
| 1940 | 16 days |
| 1941 | 13 days |
| 1942 | 29 days |
| 1943 | 27 days |
| 1944 | 23 days |
| 1945 | 21 days |
| 1946 | 27 days |
| 1947 | 34 days |
| 1948 | 33 days |
| 1949 | 29 days |
| 1950 | 11 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
54 years with a frostAcross 54 years with a frost, the median last spring frost at Waterloo falls on 3 May and the median first autumn frost on 4 October, which leaves a median of 155 days between them.
Fitted over all years, the growing season changes by +0.2 days per decade at this station.
| Measure | Median, all years | Earliest period | Recent period (1920 to 1949) | Recent against earliest | Fitted trend |
|---|---|---|---|---|---|
| Last spring frost | 3 May | n/a | 3 May | n/a | +0.2 days per decade |
| First autumn frost | 4 October | n/a | 1 October | n/a | +0.4 days per decade |
| Growing days | 155 days | n/a | 154 days | n/a | +0.2 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.
Station Changes
1 suspectedOne change was suspected in the annual mean temperature of Waterloo, at 1912. Each is measured against neighbouring stations.
- Relative to 5 neighbouring stations, the station's annual mean temperature from 1912 ran 0.3 C (0.5 F) lower than in the years before (likely change).
| Year | Shift (C) | Shift (F) | Strength | Neighbours |
|---|---|---|---|---|
| 1912 | -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
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 2026-10-17 (17 October 2026). Records are computed by this site and are not official.
Data as of . Last revised (2025-12-31).