Carbondale, IL
Illinois · Records since 1898–2026
Records for August 11
🔥 Record High
August 11, 1918
+18° from 88° normal❄ Record Low
August 11, 1989
-18° from 66° normalAll-Time Records — Carbondale
Top 10 Record Highs — August 11
| # | Temp | Date |
|---|---|---|
| 🏆 | 106°F | August 11, 1918 |
| 2 | 104°F | August 11, 1941 |
| 3 | 102°F | August 11, 1936 |
| 4 | 101°F | August 11, 2010 |
| 5 | 101°F | August 11, 1911 |
| 6 | 100°F | August 11, 1935 |
| 7 | 99°F | August 11, 1980 |
| 8 | 98°F | August 11, 1957 |
| 9 | 98°F | August 11, 1937 |
| 10 | 98°F | August 11, 1926 |
Top 5 Record Lows — August 11
| # | Temp | Date |
|---|---|---|
| 🥶 | 48°F | August 11, 1989 |
| 2 | 48°F | August 11, 1931 |
| 3 | 49°F | August 11, 1922 |
| 4 | 52°F | August 11, 1967 |
| 5 | 54°F | August 11, 1972 |
Heat Wave Summary — Carbondale
threshold: 96°F (90th percentile of historical Jun–Aug highs)2026 Daily High Temperature vs Normal
Year to date118 of 220 days with data were above the 1991–2020 normal high for their date.
Days ≥ 90°F Per Year
1899–2026Average Daily High by Decade
Full year · complete decades only
Longest Heat Waves — Carbondale
| # | Dates | Days | Peak | Avg High | Avg Overnight Low |
|---|---|---|---|---|---|
| 🏆 | Aug 9, 1936 – Aug 29, 1936 | 21 | 110°F (Aug 18) | 103°F | 74°F |
| 2 | Jul 25, 1930 – Aug 10, 1930 | 17 | 113°F (Aug 9) | 104°F | 72°F |
| 3 | Jul 15, 1901 – Jul 29, 1901 | 15 | 112°F (Jul 22) | 104°F | 71°F |
| 4 | Aug 28, 1912 – Sep 11, 1912 | 15 | 103°F (Sep 10) | 100°F | 68°F |
| 5 | Jun 21, 1901 – Jul 4, 1901 | 14 | 101°F (Jun 22) | 99°F | 73°F |
| 6 | Jul 6, 1936 – Jul 18, 1936 | 13 | 112°F (Jul 14) | 103°F | 74°F |
| 7 | Aug 31, 1925 – Sep 11, 1925 | 12 | 108°F (Sep 4) | 104°F | 68°F |
| 8 | Jun 27, 2012 – Jul 8, 2012 | 12 | 107°F (Jun 29) | 104°F | 71°F |
| 9 | Jul 5, 1914 – Jul 16, 1914 | 12 | 106°F (Jul 12) | 102°F | 70°F |
| 10 | Jun 28, 1911 – Jul 9, 1911 | 12 | 104°F (Jul 4) | 100°F | 70°F |
Heat Waves Per Year
Warm Summer Nights (Jun–Aug)
Nights where the overnight low exceeded the 1991–2020 normal low
Above-Normal Summer Nights Per Year
Average June–August Low by Decade
Overnight lows · complete decades only
Precipitation
Actual vs. 1991–2020 full-month and full-season normals
Monthly Precipitation — Last 24 Months
Blue = actual · dashed line = monthly normal
Annual Precipitation Per Year (1970–2026)
Blue = above average · tan = below average · gold = 2026 (partial)
Heavy Rain Days Per Year (≥ 1.0")
Compare year-to-year changes in days with heavy rainfall (≥ 1.0")
Month in Review — July 2026
Average temperature · July 2026
72nd-warmest month on record
43rd-warmest July of 119 on record
+1.0° vs. 78.1° average (1991–2020)Longest 90°F Streak in July
4 consecutive days with highs of at least 90°F (Jul 1–4, 2026, peaking at 95°F)
The longest July streak since 2025 (1 year). The July record is 31 days, set in 1921.
Average July Temperature by Year
1899–2026 · 2026 highlighted
Warmest Julys on Record
| # | Year | Avg Temp |
|---|---|---|
| 1 | 2012 | 84.7°F |
| 2 | 1901 | 84.6°F |
| 3 | 1936 | 84.4°F |
| 4 | 1934 | 84.4°F |
| 5 | 1914 | 83.0°F |
| 6 | 1921 | 82.9°F |
| 7 | 2011 | 82.7°F |
| 8 | 1930 | 82.3°F |
| 9 | 1916 | 82.2°F |
| 10 | 1966 | 82.0°F |
Warmest Months on Record (Any Month)
| # | Month | Avg Temp |
|---|---|---|
| 1 | August 1936 | 84.9°F |
| 2 | July 2012 | 84.7°F |
| 3 | July 1901 | 84.6°F |
| 4 | July 1936 | 84.4°F |
| 5 | July 1934 | 84.4°F |
| 6 | July 1914 | 83.0°F |
| 7 | July 1921 | 82.9°F |
| 8 | August 1918 | 82.8°F |
| 9 | July 2011 | 82.7°F |
| 10 | August 1947 | 82.5°F |
Nearby Stations — July 2026
How the same month ranked at the closest reporting stations
| Station | Avg Temp | July Rank |
|---|---|---|
| Carbondale, IL | 79.1°F | 43rd of 119 |
| Paducah, KY | 79.6°F | 35th of 88 |
| St Louis, MO | 80.5°F | 53rd of 153 |
| Evansville, IN | 79.5°F | 40th of 130 |
| Poplar Bluff, MO | 80.4°F | 43rd of 111 |