| Month | Average (°F) | Record (°F) | Average (inches) | |||
|---|---|---|---|---|---|---|
| High ☀️ | Low 🌙 | High ☀️ | Low 🌙 | Precipitation 💧 | Snow ❄️ | |
| January | 27.0 | 9.3 | 65 | -34 | 1.1 | 10.0 |
| February | 31.4 | 13.9 | 78 | -31 | 1.1 | 9.3 |
| March | 45.3 | 25.7 | 87 | -34 | 2.0 | 4.6 |
| April | 59.8 | 36.6 | 100 | -4 | 4.0 | 1.7 |
| May | 71.6 | 48.9 | 108 | 22 | 4.6 | 0.1 |
| June | 81.1 | 59.5 | 107 | 33 | 5.7 | 0.0 |
| July | 83.9 | 62.7 | 112 | 42 | 4.3 | 0.0 |
| August | 81.7 | 59.7 | 110 | 33 | 4.2 | 0.0 |
| September | 75.7 | 51.1 | 102 | 19 | 3.1 | 0.0 |
| October | 61.8 | 38.9 | 95 | 0 | 2.8 | 0.3 |
| November | 46.0 | 26.4 | 83 | -17 | 1.9 | 3.1 |
| December | 32.6 | 15.7 | 74 | -29 | 1.4 | 9.9 |
| Entire year | 58.3 | 37.5 | 112 | -34 | 36.3 | 39.1 |
|
More Waterloo Weather Records
1895–2024
|
||
|---|---|---|
| Highest daily low | 80 °F | August 16, 1988 |
| Lowest daily high | -16 °F | February 2, 1996 |
| Greatest daily range (Difference of high and low) |
59 °F | January 18, 1996 |
| Greatest difference in daily high over two conscutive days |
52 °F | Jan 18–19, 1996 |
| Most daily precipitation | 5.5 inches | July 2, 1999 |
| Most monthly precipitation | 13.4 inches | September 2018 |
| Most yearly precipitation | 54.2 inches | 2018 |
| Most yearly days with precipitation | 139 | 2019 |
| Earliest snow in season | October 14 | 2018 |
| Latest snow in season | May 29 | 1947 |
| Most daily snow | 13.2 inches | January 3, 1971 |
| Most monthly snow | 33.9 inches | December 2000 |
| Most yearly snow | 64.7 inches | 2019 |
| Most snow in a winter | 60.0 inches | 2018–2019 |
| Greatest snow accumulation | 25.0 inches | February 20, 1936 |
| Earliest freeze | September 13 | 1975 |
| Earliest day ≥ 80 °F | March 3 | 2024 |
| Earliest day ≥ 90 °F | April 10 | 1930 |
| Earliest day ≥ 100 °F | April 22 | 1980 |
| Latest freeze | May 29 | 1965 |
| Latest day ≥ 80 °F | November 8 | 1999 |
| Latest day ≥ 90 °F | October 14 | 1897 |
| Latest day ≥ 100 °F | September 15 | 1927 |
| Most days in a year < 0 °F | 51 | 1978 |
| Most days in a year < 32 °F | 170 | 1976 |
| Most days in a year ≥ 80 °F | 126 | 2023 |
| Most days in a year ≥ 90 °F | 60 | 1936 |
| Most days in a year ≥ 100 °F | 20 | 1936 |
| Most days in a year ≥ 110 °F | 4 | 1936 |
|
Waterloo Weather Streaks
Most consecutive days...
|
||
|---|---|---|
| With precipitation | 10 days | May 16–25, 1902 |
| Without precipitation | 43 days | Sep 5 – Oct 17, 1953 |
| With snow | 7 days | Feb 5–11, 2018 |
| High temperature at or below freezing |
52 days | Dec 30, 1978 – Feb 19, 1979 |
| High temperature ≥ 80 °F | 67 days | Jun 23 – Aug 28, 1936 |
| High temperature ≥ 90 °F | 21 days | Jun 28 – Jul 18, 1921 |
| High temperature ≥ 100 °F | 13 days | Jul 5–17, 1936 |
| High temperature ≥ 110 °F | 3 days | Jul 12–14, 1936 |