July
July · August · June
90climate match
United States · 1991–2020
Best time to visit
Sumas.
July leads for comfortable weather in Sumas: typically 24.5°C by day, 11.2°C at night, with 37 mm of rain. Based on measured 1991–2020 NOAA station history.
Best comfortJuly
Typical high24.5°C
Typical low11.2°C
Rain in July37 mm
July
July · August · June
57climate match
June
June · July · August
85climate match
The weakest month is January, scoring 5 against July’s 90 — days reach only 6.5°C, 17° 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
56.5° / 0.6°
Feb
78.6° / 1.2°
Mar
1311.7° / 2.6°
Apr
3415.2° / 4.6°
May
5919.2° / 7.6°
Jun
7421.4° / 10.1°
Jul
9024.5° / 11.2°
Aug
8724.8° / 10.7°
Sep
7121.8° / 8.6°
Oct
3215.3° / 5.9°
Nov
59.6° / 2.9°
Dec
56.1° / 0.6°
| Month | Day | Night | Rain | Wet days | Daylight | Comfort | Coverage |
|---|---|---|---|---|---|---|---|
| January | 6.5°C | 0.6°C | 170 mm | 15.7 | 8 h 39 | 5 | Strong coverage |
| February | 8.6°C | 1.2°C | 98 mm | 13.1 | 10 h 04 | 7 | Strong coverage |
| March | 11.7°C | 2.6°C | 125 mm | 15.7 | 11 h 43 | 13 | Strong coverage |
| April | 15.2°C | 4.6°C | 101 mm | 12.7 | 13 h 38 | 34 | Strong coverage |
| May | 19.2°C | 7.6°C | 81 mm | 9.4 | 15 h 15 | 59 | Strong coverage |
| June | 21.4°C | 10.1°C | 60 mm | 8.3 | 16 h 10 | 74 | Strong coverage |
| July | 24.5°C | 11.2°C | 37 mm | 4.8 | 15 h 48 | 90 | Strong coverage |
| August | 24.8°C | 10.7°C | 38 mm | 5.1 | 14 h 23 | 87 | Strong coverage |
| September | 21.8°C | 8.6°C | 74 mm | 7.8 | 12 h 32 | 71 | Strong coverage |
| October | 15.3°C | 5.9°C | 135 mm | 12.9 | 10 h 42 | 32 | Strong coverage |
| November | 9.6°C | 2.9°C | 181 mm | 16.5 | 9 h 04 | 5 | Strong coverage |
| December | 6.1°C | 0.6°C | 155 mm | 16.2 | 8 h 15 | 5 | Strong coverage |
What has changed
Sumas runs +0.6°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
+1.0
Feb
-1.2
Mar
+0.2
Apr
+0.3
May
+1.2
Jun
+0.6
Jul
+1.3
Aug
+1.4
Sep
+1.1
Oct
+0.5
Nov
+0.5
Dec
+0.3
| Month | Record high | Record low | Wettest day | Wettest / driest month | Years |
|---|---|---|---|---|---|
| January | 18.9°C30 Jan 2024 | -20.0°C13 Jan 1911 | 197 mm24 Jan 1935 | 373 mm1935 · driest 20 mm in 1950 | 123 |
| February | 19.4°C27 Feb 1968 | -17.2°C1 Feb 1989 | 79 mm14 Feb 1982 | 273 mm1982 · driest 8 mm in 1993 | 122 |
| March | 27.2°C22 Mar 1915 | -12.8°C4 Mar 1955 | 61 mm5 Mar 1972 | 275 mm2007 · driest 17 mm in 2021 | 124 |
| April | 30.0°C24 Apr 1905 | -6.1°C5 Apr 1911 | 48 mm4 Apr 1919 | 182 mm1972 · driest 11 mm in 1956 | 124 |
| May | 36.7°C29 May 1983 | -4.4°C17 May 1903 | 107 mm31 May 1918 | 213 mm1918 · driest 6 mm in 1946 | 123 |
| June | 41.1°C28 Jun 2021 | -1.7°C19 Jun 1911 | 63 mm10 Jun 1981 | 211 mm1981 · driest 1 mm in 1922 | 122 |
| July | 38.9°C15 Jul 1941 | -1.1°C6 Jul 1915 | 64 mm12 Jul 1972 | 133 mm1964 · driest 0 mm in 1922 | 123 |
| August | 36.7°C9 Aug 1960 | -1.1°C22 Aug 1909 | 76 mm31 Aug 1912 | 199 mm1912 · driest 1 mm in 1986 | 122 |
| September | 35.6°C4 Sep 2017 | -6.7°C25 Sep 1908 | 68 mm1 Sep 1936 | 224 mm1920 · driest 1 mm in 2022 | 123 |
| October | 28.9°C10 Oct 1934 | -7.2°C31 Oct 1984 | 74 mm25 Oct 1945 | 279 mm2003 · driest 14 mm in 1987 | 123 |
| November | 22.2°C8 Nov 2016 | -17.8°C27 Nov 1985 | 109 mm16 Nov 1910 | 511 mm2021 · driest 21 mm in 1952 | 121 |
| December | 18.3°C27 Dec 1980 | -20.0°C29 Dec 1968 | 83 mm15 Dec 1933 | 359 mm1917 · driest 19 mm in 1985 | 123 |
| Month | Days 25°C+ | Days 30°C+ | Frost nights | Heavy rain (10 mm+) | Snow days |
|---|---|---|---|---|---|
| January | 0 | 0 | 13 | 6 | 2 |
| February | 0 | 0 | 11 | 3 | 2 |
| March | 0 | 0 | 7 | 4 | 1 |
| April | <1 | 0 | 2 | 3 | <1 |
| May | 4 | <1 | <1 | 3 | 0 |
| June | 5 | 1 | 0 | 2 | 0 |
| July | 14 | 3 | 0 | 1 | 0 |
| August | 15 | 3 | 0 | 1 | 0 |
| September | 7 | <1 | <1 | 3 | 0 |
| October | <1 | 0 | 3 | 5 | 0 |
| November | 0 | 0 | 8 | 6 | <1 |
| December | 0 | 0 | 13 | 5 | 2 |
| Month | Warm & dry days | Wet days | Washouts | Week with 3+ wet days | Daytime mean has ranged |
|---|---|---|---|---|---|
| January | 0% | 50% | 17% | 66% | 2.0–8.5°C |
| February | 0% | 45% | 13% | 62% | 5.0–10.6°C |
| March | 2% | 46% | 13% | 61% | 9.4–13.4°C |
| April | 13% | 39% | 9% | 52% | 13.0–17.4°C |
| May | 34% | 32% | 8% | 39% | 16.7–21.1°C |
| June | 55% | 28% | 7% | 34% | 19.3–23.3°C |
| July | 81% | 16% | 4% | 14% | 22.4–26.4°C |
| August | 78% | 17% | 5% | 19% | 22.3–26.1°C |
| September | 54% | 27% | 9% | 33% | 19.0–23.5°C |
| October | 13% | 41% | 15% | 58% | 13.7–17.2°C |
| November | <1% | 52% | 20% | 71% | 7.4–11.7°C |
| December | 0% | 53% | 18% | 72% | 3.1–8.1°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 5812494
- NOAA station
- USC00451484 · CLEARBROOK
- Station distance
- 6 km from the place centre
- Climate period
- 1991–2020
- Minimum month coverage
- 29 usable years
- Daylight
- Calculated from latitude 49.00°, 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.