August
August · September · June
82climate match
United States · 1991–2020
Best time to visit
Wheaton.
August leads for comfortable weather in Wheaton: typically 27°C by day, 14.8°C at night, with 69 mm of rain. Based on measured 1991–2020 NOAA station history.
Best comfortAugust
Typical high27°C
Typical low14.8°C
Rain in August69 mm
July
July · August · June
69climate match
May
May · September · October
82climate match
The weakest month is January, scoring 5 against August’s 82 — days reach only -6.3°C, 30° 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
5-6.3° / -16.3°
Feb
5-3.6° / -14.3°
Mar
53.8° / -6.7°
Apr
3212.9° / 0.5°
May
6620.7° / 7.8°
Jun
7725.7° / 14.2°
Jul
7228° / 16.3°
Aug
8227° / 14.8°
Sep
7923° / 9.9°
Oct
4014.4° / 2.5°
Nov
54.9° / -5.1°
Dec
5-3.3° / -12.3°
| Month | Day | Night | Rain | Wet days | Daylight | Comfort | Coverage |
|---|---|---|---|---|---|---|---|
| January | -6.3°C | -16.3°C | 22 mm | 4.3 | 9 h 02 | 5 | Strong coverage |
| February | -3.6°C | -14.3°C | 18 mm | 3.7 | 10 h 17 | 5 | Strong coverage |
| March | 3.8°C | -6.7°C | 30 mm | 4.5 | 11 h 46 | 5 | Strong coverage |
| April | 12.9°C | 0.5°C | 58 mm | 5.9 | 13 h 28 | 32 | Strong coverage |
| May | 20.7°C | 7.8°C | 70 mm | 8.2 | 14 h 54 | 66 | Strong coverage |
| June | 25.7°C | 14.2°C | 107 mm | 9.3 | 15 h 42 | 77 | Strong coverage |
| July | 28°C | 16.3°C | 91 mm | 8 | 15 h 23 | 72 | Strong coverage |
| August | 27°C | 14.8°C | 69 mm | 6.7 | 14 h 08 | 82 | Strong coverage |
| September | 23°C | 9.9°C | 74 mm | 6.4 | 12 h 29 | 79 | Strong coverage |
| October | 14.4°C | 2.5°C | 59 mm | 6.2 | 10 h 51 | 40 | Strong coverage |
| November | 4.9°C | -5.1°C | 26 mm | 3.6 | 9 h 24 | 5 | Strong coverage |
| December | -3.3°C | -12.3°C | 21 mm | 4.4 | 8 h 41 | 5 | Strong coverage |
What has changed
Wheaton runs -1.2°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
+0.4
Feb
-2.2
Mar
-0.1
Apr
-3.2
May
-1.7
Jun
-1.0
Jul
-2.4
Aug
-2.8
Sep
+0.2
Oct
-1.9
Nov
-0.2
Dec
+0.6
| Month | Record high | Record low | Wettest day | Wettest / driest month | Years |
|---|---|---|---|---|---|
| January | 16.1°C24 Jan 1981 | -38.9°C13 Jan 1916 | 52 mm5 Jan 1997 | 80 mm1997 · driest 0 mm in 1974 | 108 |
| February | 18.9°C2 Feb 1991 | -37.2°C16 Feb 1936 | 26 mm8 Feb 1937 | 52 mm1946 · driest 0 mm in 1950 | 110 |
| March | 28.9°C31 Mar 1963 | -34.4°C11 Mar 1948 | 53 mm19 Mar 1982 | 104 mm1995 · driest 1 mm in 2020 | 110 |
| April | 36.7°C21 Apr 1980 | -21.7°C1 Apr 1924 | 56 mm26 Apr 1924 | 161 mm1937 · driest 3 mm in 1980 | 110 |
| May | 41.1°C31 May 1934 | -10.0°C6 May 1925 | 109 mm10 May 1920 | 188 mm1938 · driest 7 mm in 1928 | 109 |
| June | 41.1°C16 Jun 1933 | -0.6°C9 Jun 1915 | 178 mm2 Jun 2007 | 268 mm1914 · driest 16 mm in 1929 | 112 |
| July | 45.0°C16 Jul 1936 | 3.9°C3 Jul 1972 | 125 mm8 Jul 1950 | 204 mm2011 · driest 18 mm in 1936 | 112 |
| August | 42.8°C10 Aug 1947 | -0.6°C30 Aug 1931 | 100 mm31 Aug 1982 | 182 mm1940 · driest 2 mm in 1970 | 112 |
| September | 42.2°C10 Sep 1931 | -7.8°C29 Sep 1939 | 84 mm2 Sep 2006 | 200 mm2004 · driest 1 mm in 1979 | 112 |
| October | 35.6°C5 Oct 1963 | -20.0°C26 Oct 1919 | 74 mm5 Oct 1946 | 179 mm2009 · driest 0 mm in 1952 | 111 |
| November | 27.2°C1 Nov 1950 | -27.2°C24 Nov 1951 | 45 mm19 Nov 2024 | 128 mm2000 · driest 0 mm in 1999 | 109 |
| December | 23.3°C9 Dec 1939 | -36.7°C21 Dec 1916 | 38 mm26 Dec 2023 | 102 mm2023 · driest 0 mm in 1982 | 109 |
| Month | Days 25°C+ | Days 30°C+ | Frost nights | Heavy rain (10 mm+) | Snow days |
|---|---|---|---|---|---|
| January | 0 | 0 | 31 | <1 | 5 |
| February | 0 | 0 | 27 | <1 | 4 |
| March | <1 | 0 | 26 | <1 | 3 |
| April | 1 | <1 | 14 | 2 | 2 |
| May | 8 | 3 | 1 | 2 | 0 |
| June | 18 | 6 | 0 | 4 | 0 |
| July | 25 | 10 | 0 | 3 | 0 |
| August | 22 | 7 | 0 | 2 | 0 |
| September | 12 | 3 | <1 | 2 | 0 |
| October | 3 | <1 | 10 | 2 | <1 |
| November | <1 | 0 | 25 | <1 | 2 |
| December | 0 | 0 | 31 | <1 | 5 |
| Month | Warm & dry days | Wet days | Washouts | Week with 3+ wet days | Daytime mean has ranged |
|---|---|---|---|---|---|
| January | 0% | 12% | 1% | 7% | -11.5–-0.8°C |
| February | 0% | 12% | 1% | 6% | -8.0–1.9°C |
| March | 2% | 14% | 3% | 9% | -0.3–8.4°C |
| April | 18% | 22% | 7% | 23% | 9.9–17.3°C |
| May | 49% | 25% | 8% | 28% | 18.4–25.2°C |
| June | 65% | 30% | 11% | 36% | 23.6–28.8°C |
| July | 76% | 23% | 8% | 22% | 26.6–31.6°C |
| August | 77% | 22% | 7% | 18% | 25.5–31.4°C |
| September | 61% | 20% | 6% | 18% | 20.9–26.4°C |
| October | 28% | 16% | 4% | 12% | 12.4–18.9°C |
| November | 2% | 12% | 3% | 7% | 1.1–8.9°C |
| December | <1% | 11% | 1% | 6% | -7.9–1.3°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 5052600
- NOAA station
- USC00218907 · WHEATON
- Station distance
- 0.6 km from the place centre
- Climate period
- 1991–2020
- Minimum month coverage
- 29 usable years
- Daylight
- Calculated from latitude 45.80°, 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.