June
June · August · September
81climate match
Canada · 1991–2020
Best time to visit
Cornwall.
June leads for comfortable weather in Cornwall: typically 24.7°C by day, 14.1°C at night, with 92 mm of rain. Based on measured 1991–2020 NOAA station history.
Best comfortJune
Typical high24.7°C
Typical low14.1°C
Rain in June92 mm
July
July · August · June
65climate match
May
May · September · June
80climate match
The weakest month is January, scoring 5 against June’s 81 — days reach only -3.8°C, 28° below the 24°C the score treats as ideal.
Month by month
The whole year,
without the guesswork.
The bars show the comfort score. Day and night temperatures come from daily observed highs and lows; rain is the historical monthly estimate.
Jan
5-3.8° / -11.8°
Feb
5-2.2° / -10.6°
Mar
53.4° / -5.3°
Apr
2111.8° / 2°
May
6119.8° / 8.9°
Jun
8124.7° / 14.1°
Jul
7027.3° / 17°
Aug
7726.2° / 16.1°
Sep
7322° / 11.8°
Oct
3414.2° / 5.7°
Nov
56.9° / -0.3°
Dec
5-0.2° / -6.9°
| Month | Day | Night | Rain | Wet days | Daylight | Comfort | Coverage |
|---|---|---|---|---|---|---|---|
| January | -3.8°C | -11.8°C | 78 mm | 12.8 | 9 h 07 | 5 | Strong coverage |
| February | -2.2°C | -10.6°C | 63 mm | 10.8 | 10 h 20 | 5 | Strong coverage |
| March | 3.4°C | -5.3°C | 64 mm | 9.9 | 11 h 46 | 5 | Strong coverage |
| April | 11.8°C | 2°C | 88 mm | 11.2 | 13 h 25 | 21 | Strong coverage |
| May | 19.8°C | 8.9°C | 85 mm | 10.6 | 14 h 49 | 61 | Strong coverage |
| June | 24.7°C | 14.1°C | 92 mm | 11.1 | 15 h 36 | 81 | Strong coverage |
| July | 27.3°C | 17°C | 97 mm | 10.6 | 15 h 17 | 70 | Strong coverage |
| August | 26.2°C | 16.1°C | 87 mm | 9.8 | 14 h 04 | 77 | Strong coverage |
| September | 22°C | 11.8°C | 94 mm | 10.2 | 12 h 28 | 73 | Strong coverage |
| October | 14.2°C | 5.7°C | 101 mm | 11.4 | 10 h 53 | 34 | Strong coverage |
| November | 6.9°C | -0.3°C | 77 mm | 11.4 | 9 h 29 | 5 | Strong coverage |
| December | -0.2°C | -6.9°C | 76 mm | 12.9 | 8 h 47 | 5 | Strong coverage |
What has changed
Cornwall runs +1.7°C
on the 1961–1990 baseline.
Each bar compares the 2011–2025 daytime average for that month against the same month in 1961–1990, measured at the same station. Months where the older record is too thin to compare are left blank.
Jan
+1.7
Feb
+2.1
Mar
+1.3
Apr
+0.7
May
+1.8
Jun
+1.2
Jul
+1.4
Aug
+1.7
Sep
+2.5
Oct
+1.9
Nov
+1.2
Dec
+2.7
| Month | Record high | Record low | Wettest day | Wettest / driest month | Years |
|---|---|---|---|---|---|
| January | 18.0°C19 Jan 1996 | -43.3°C15 Jan 1957 | 53 mm30 Jan 1966 | 188 mm1978 · driest 5 mm in 1961 | 74 |
| February | 21.0°C27 Feb 2024 | -35.6°C10 Feb 1951 | 38 mm24 Feb 2016 | 135 mm1971 · driest 10 mm in 2007 | 74 |
| March | 26.0°C21 Mar 2012 | -27.0°C3 Mar 2003 | 42 mm17 Mar 1973 | 132 mm1955 · driest 14 mm in 2006 | 74 |
| April | 31.0°C27 Apr 2009 | -15.0°C3 Apr 1954 | 50 mm5 Apr 2023 | 159 mm2011 · driest 13 mm in 1966 | 74 |
| May | 35.0°C26 May 2010 | -5.6°C8 May 1956 | 47 mm8 May 2000 | 171 mm2000 · driest 17 mm in 2021 | 73 |
| June | 35.0°C22 Jun 2020 | 0.6°C4 Jun 1953 | 67 mm13 Jun 2003 | 183 mm1998 · driest 7 mm in 1965 | 73 |
| July | 37.5°C10 Jul 2020 | 3.3°C30 Jul 1952 | 73 mm17 Jul 1977 | 187 mm1996 · driest 31 mm in 1960 | 73 |
| August | 36.5°C8 Aug 2001 | 1.7°C28 Aug 1957 | 82 mm31 Aug 2005 | 191 mm1955 · driest 10 mm in 1957 | 73 |
| September | 34.5°C9 Sep 2002 | -6.1°C30 Sep 1951 | 110 mm14 Sep 1979 | 198 mm2010 · driest 27 mm in 1984 | 73 |
| October | 31.5°C4 Oct 2023 | -8.3°C26 Oct 1956 | 70 mm31 Oct 2019 | 221 mm2005 · driest 22 mm in 1966 | 72 |
| November | 25.0°C5 Nov 2022 | -20.0°C6 Nov 1951 | 57 mm28 Nov 2003 | 152 mm1963 · driest 21 mm in 1955 | 73 |
| December | 20.0°C5 Dec 2001 | -33.3°C22 Dec 1955 | 36 mm21 Dec 1993 | 170 mm1973 · driest 9 mm in 1960 | 74 |
| Month | Days 25°C+ | Days 30°C+ | Frost nights | Heavy rain (10 mm+) | Snow days |
|---|---|---|---|---|---|
| January | 0 | 0 | 29 | 2 | 11 |
| February | 0 | 0 | 26 | 2 | 9 |
| March | <1 | 0 | 25 | 2 | 6 |
| April | <1 | 0 | 11 | 3 | 2 |
| May | 6 | 1 | <1 | 3 | 0 |
| June | 16 | 4 | 0 | 3 | 0 |
| July | 24 | 8 | 0 | 3 | 0 |
| August | 21 | 5 | 0 | 3 | 0 |
| September | 9 | 2 | <1 | 3 | 0 |
| October | 1 | 0 | 4 | 3 | <1 |
| November | 0 | 0 | 16 | 3 | 3 |
| December | 0 | 0 | 26 | 2 | 9 |
| Month | Warm & dry days | Wet days | Washouts | Week with 3+ wet days | Daytime mean has ranged |
|---|---|---|---|---|---|
| January | 0% | 39% | 7% | 54% | -8.5–-0.9°C |
| February | <1% | 36% | 7% | 46% | -6.6–0.5°C |
| March | <1% | 31% | 6% | 40% | 0.3–6.4°C |
| April | 8% | 35% | 10% | 47% | 9.4–14.0°C |
| May | 34% | 34% | 9% | 43% | 16.7–22.0°C |
| June | 57% | 34% | 10% | 44% | 22.0–25.9°C |
| July | 68% | 31% | 10% | 39% | 25.3–28.7°C |
| August | 65% | 31% | 10% | 40% | 23.6–27.5°C |
| September | 41% | 32% | 10% | 41% | 18.7–23.5°C |
| October | 12% | 33% | 9% | 45% | 11.7–16.4°C |
| November | <1% | 37% | 9% | 52% | 3.7–9.1°C |
| December | 0% | 40% | 8% | 60% | -5.1–2.2°C |
A warm and dry day reaches 20°C with under 1 mm of rain; a wet day gets 1 mm or more; a washout gets 10 mm or more. The week column is the share of seven-day stretches in that month, across the station’s whole daily record, that contained three or more wet days — the odds a week-long trip is rained on repeatedly, counted rather than modelled. The last column is the 10th to 90th percentile of that month’s daytime average across individual years: a narrow band means the average is what you will get, a wide one means the average is a midpoint between years that felt quite different.
The evidence behind this page
Nearby, measured,
and named.
- Place identity
- GeoNames 5928065
- NOAA station
- CA006101874 · CORNWALL
- Station distance
- 1.7 km from the place centre
- Climate period
- 1991–2020
- Minimum month coverage
- 30 usable years
- Daylight
- Calculated from latitude 45.02°, mid-month, sunrise to sunset including refraction. Not a station measurement.
- Important limit
- Historical climate is not a forecast. Nearby stations can miss mountains, coasts, and local microclimates.