April
April · October · March
United States · 1991–2020
April leads for comfortable weather in Highland Park: typically 25.1°C by day, 13.8°C at night, with 80 mm of rain. Based on measured 1991–2020 NOAA station history.
April · October · March
September · May · June
November · March · February
The weakest month is August, scoring 38 against April’s 85 — days average 36°C, 12° above the 24°C the score treats as ideal.
Month by month
The bars show the comfort score. Day and night temperatures come from daily observed highs and lows; rain is the historical monthly estimate.
| Month | Day | Night | Rain | Wet days | Daylight | Comfort | Coverage |
|---|---|---|---|---|---|---|---|
| January | 14.1°C | 3.3°C | 64 mm | 5.2 | 10 h 12 | 40 | Strong coverage |
| February | 16.5°C | 5.5°C | 70 mm | 5.1 | 10 h 58 | 51 | Strong coverage |
| March | 20.9°C | 9.7°C | 88 mm | 6.1 | 11 h 53 | 70 | Strong coverage |
| April | 25.1°C | 13.8°C | 80 mm | 5.8 | 12 h 57 | 85 | Strong coverage |
| May | 29.2°C | 18.9°C | 116 mm | 7.8 | 13 h 50 | 60 | Strong coverage |
| June | 33.5°C | 23.2°C | 97 mm | 6 | 14 h 18 | 42 | Strong coverage |
| July | 35.9°C | 25.4°C | 44 mm | 3.9 | 14 h 07 | 40 | Strong coverage |
| August | 36°C | 25.3°C | 56 mm | 4.3 | 13 h 22 | 38 | Strong coverage |
| September | 32°C | 21.2°C | 79 mm | 4.6 | 12 h 20 | 55 | Strong coverage |
| October | 26.2°C | 14.8°C | 122 mm | 5.9 | 11 h 18 | 78 | Strong coverage |
| November | 19.6°C | 8.7°C | 74 mm | 5.2 | 10 h 25 | 67 | Strong coverage |
| December | 14.9°C | 4.3°C | 79 mm | 5.1 | 10 h | 43 | Strong coverage |
What has changed
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.
| Month | Record high | Record low | Wettest day | Wettest / driest month | Years |
|---|---|---|---|---|---|
| January | 31.1°C8 Jan 1969 | -17.8°C23 Jan 1940 | 131 mm24 Jan 1949 | 215 mm1949 · driest 0 mm in 1986 | 87 |
| February | 35.0°C22 Feb 1996 | -16.6°C16 Feb 2021 | 97 mm20 Feb 2018 | 266 mm2018 · driest 4 mm in 1996 | 87 |
| March | 36.1°C31 Mar 1974 | -11.7°C3 Mar 1943 | 175 mm19 Mar 2006 | 242 mm1945 · driest 4 mm in 1956 | 87 |
| April | 37.8°C17 Apr 2006 | -0.6°C13 Apr 1957 | 130 mm26 Apr 1957 | 391 mm1966 · driest 1 mm in 1983 | 87 |
| May | 39.4°C31 May 1985 | 3.9°C4 May 1954 | 131 mm17 May 1949 | 381 mm2015 · driest 14 mm in 1977 | 87 |
| June | 44.4°C27 Jun 1980 | 11.7°C1 Jun 1982 | 134 mm11 Jun 2009 | 310 mm1941 · driest 7 mm in 1944 | 87 |
| July | 44.4°C22 Jul 2018 | 15.6°C13 Jul 1990 | 117 mm27 Jul 1962 | 216 mm1962 · driest 0 mm in 1942 | 87 |
| August | 43.9°C3 Aug 2011 | 13.3°C20 Aug 1940 | 173 mm27 Aug 1947 | 275 mm1947 · driest 0 mm in 2000 | 87 |
| September | 43.3°C4 Sep 2000 | 2.2°C27 Sep 1942 | 133 mm8 Sep 2010 | 315 mm2018 · driest 0 mm in 1956 | 87 |
| October | 37.8°C1 Oct 1979 | -2.8°C31 Oct 1993 | 153 mm1 Oct 1959 | 416 mm2018 · driest 0 mm in 1975 | 87 |
| November | 33.3°C2 Nov 2017 | -8.3°C11 Nov 1950 | 125 mm2 Nov 1946 | 263 mm2015 · driest 0 mm in 2012 | 87 |
| December | 31.7°C24 Dec 1955 | -17.2°C23 Dec 1989 | 101 mm20 Dec 1991 | 235 mm1991 · driest 1 mm in 2025 | 87 |
| Month | Days 25°C+ | Days 30°C+ | Frost nights | Heavy rain (10 mm+) | Snow days |
|---|---|---|---|---|---|
| January | 1 | 0 | 9 | 2 | <1 |
| February | 3 | <1 | 5 | 2 | <1 |
| March | 9 | 1 | 1 | 3 | <1 |
| April | 18 | 4 | 0 | 3 | 0 |
| May | 27 | 15 | 0 | 3 | 0 |
| June | 30 | 27 | 0 | 3 | 0 |
| July | 31 | 30 | 0 | 1 | 0 |
| August | 31 | 30 | 0 | 2 | 0 |
| September | 29 | 23 | 0 | 2 | 0 |
| October | 20 | 8 | <1 | 3 | 0 |
| November | 6 | <1 | 2 | 2 | <1 |
| December | 1 | 0 | 7 | 2 | <1 |
| Month | Warm & dry days | Wet days | Washouts | Week with 3+ wet days | Daytime mean has ranged |
|---|---|---|---|---|---|
| January | 19% | 17% | 5% | 15% | 9.9–16.2°C |
| February | 30% | 19% | 7% | 16% | 12.6–19.3°C |
| March | 50% | 19% | 8% | 14% | 17.1–23.1°C |
| April | 70% | 21% | 10% | 20% | 22.9–27.2°C |
| May | 75% | 24% | 12% | 25% | 27.5–30.7°C |
| June | 81% | 19% | 10% | 18% | 31.6–35.1°C |
| July | 88% | 13% | 5% | 10% | 33.7–37.8°C |
| August | 87% | 13% | 6% | 12% | 33.6–37.9°C |
| September | 84% | 16% | 7% | 11% | 29.5–34.4°C |
| October | 76% | 17% | 9% | 16% | 24.2–28.5°C |
| November | 46% | 17% | 7% | 13% | 16.7–22.3°C |
| December | 22% | 16% | 7% | 14% | 12.3–17.2°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