| Month | Average (°C) | Record (°C) | Average (cm) | |||
|---|---|---|---|---|---|---|
| High ☀️ | Low 🌙 | High ☀️ | Low 🌙 | Precipitation 💧 | Snow ❄️ | |
| January | -3.7 | -12.0 | 18.0 | -43.3 | 7.8 | 48.9 |
| February | -2.1 | -10.6 | 21.0 | -36.1 | 6.3 | 45.2 |
| March | 3.6 | -5.2 | 26.0 | -32.2 | 6.3 | 32.8 |
| April | 11.8 | 2.0 | 31.0 | -18.3 | 8.7 | 9.7 |
| May | 19.8 | 8.8 | 35.6 | -6.1 | 8.5 | 0.0 |
| June | 24.7 | 14.1 | 35.6 | 0.6 | 9.1 | 0.0 |
| July | 27.3 | 16.9 | 37.8 | 3.3 | 9.7 | 0.0 |
| August | 26.2 | 16.1 | 36.5 | 1.7 | 8.6 | 0.0 |
| September | 21.9 | 11.7 | 34.5 | -6.1 | 9.4 | 0.0 |
| October | 14.2 | 5.7 | 31.5 | -9.4 | 9.9 | 0.6 |
| November | 7.0 | -0.2 | 25.0 | -21.7 | 7.7 | 15.3 |
| December | 0.0 | -6.7 | 20.0 | -34.4 | 7.5 | 39.4 |
| Entire year | 12.6 | 3.4 | 37.8 | -43.3 | 98.6 | 196.3 |
|
More Cornwall Weather Records
1867–2024
|
||
|---|---|---|
| Highest daily low | 26.0 °C | July 1, 2014 |
| Lowest daily high | -29.0 °C | January 3, 1981 |
| Greatest daily range (Difference of high and low) |
32.2 °C | April 14, 1869 |
| Greatest difference in daily high over two conscutive days |
28.4 °C | Feb 5–6, 1962 |
| Most daily precipitation | 11.0 cm | September 14, 1979 |
| Most monthly precipitation | 22.1 cm | October 2005 |
| Most yearly precipitation | 123.2 cm | 2017 |
| Most yearly days with precipitation | 174 | 2000 |
| Earliest snow in season | October 2 | 1974 |
| Latest snow in season | May 12 | 1996 |
| Most daily snow | 53.3 cm | January 30, 1966 |
| Most monthly snow | 136.0 cm | January 1977 |
| Most yearly snow | 371.4 cm | 1971 |
| Most snow in a winter | 407.1 cm | 1970–1971 |
| Greatest snow accumulation | 74.0 cm | February 15, 2014 |
| Earliest freeze | September 8 | 1952 |
| Earliest day ≥ 20 °C | February 27 | 2024 |
| Earliest day ≥ 25 °C | March 20 | 2012 |
| Earliest day ≥ 30 °C | April 14 | 1869 |
| Earliest day ≥ 35 °C | May 26 | 2010 |
| Latest freeze | May 30 | 1961 |
| Latest day ≥ 20 °C | December 5 | 2001 |
| Latest day ≥ 25 °C | November 5 | 2022 |
| Latest day ≥ 30 °C | October 5 | 2023 |
| Latest day ≥ 35 °C | August 31 | 1881 |
| Most days in a year < 0 °C | 182 | 1873 |
| Most days in a year ≥ 20 °C | 145 | 2023 |
| Most days in a year ≥ 25 °C | 100 | 2012 |
| Most days in a year ≥ 30 °C | 43 | 1955 |
| Most days in a year ≥ 35 °C | 7 | 1955 |
|
Cornwall Weather Streaks
Most consecutive days...
|
||
|---|---|---|
| With precipitation | 14 days | Jun 18 – Jul 1, 2017 |
| Without precipitation | 25 days | Sep 9 – Oct 3, 2017 |
| With snow | 10 days | Feb 9–18, 1968 |
| Freezing temperatures High temperature ≤ 0 °C |
47 days | Dec 26, 1976 – Feb 10, 1977 |
| High temperature ≥ 20 °C | 117 days | May 23 – Sep 16, 1952 |
| High temperature ≥ 25 °C | 58 days | Jun 27 – Aug 23, 1955 |
| High temperature ≥ 30 °C | 12 days | Jun 30 – Jul 11, 1955 |
| High temperature ≥ 35 °C | 3 days | Jul 21–23, 1955 |