Quincy, IL
Illinois · Records since 1901–2026
Records for August 11
🔥 Record High
August 11, 1934
+20° from 85° normal❄ Record Low
August 11, 2004
-16° from 66° normalAll-Time Records — Quincy
Top 10 Record Highs — August 11
| # | Temp | Date |
|---|---|---|
| 🏆 | 105°F | August 11, 1934 |
| 2 | 103°F | August 11, 1941 |
| 3 | 99°F | August 11, 1918 |
| 4 | 98°F | August 11, 1947 |
| 5 | 98°F | August 11, 1935 |
| 6 | 98°F | August 11, 1923 |
| 7 | 97°F | August 11, 2007 |
| 8 | 97°F | August 11, 1936 |
| 9 | 97°F | August 11, 1920 |
| 10 | 96°F | August 11, 1913 |
Top 5 Record Lows — August 11
| # | Temp | Date |
|---|---|---|
| 🥶 | 50°F | August 11, 2004 |
| 2 | 50°F | August 11, 1982 |
| 3 | 50°F | August 11, 1967 |
| 4 | 50°F | August 11, 1902 |
| 5 | 52°F | August 11, 1966 |
Heat Wave Summary — Quincy
threshold: 95°F (90th percentile of historical Jun–Aug highs)2026 Daily High Temperature vs Normal
Year to date131 of 221 days with data were above the 1991–2020 normal high for their date.
Days ≥ 90°F Per Year
1901–2026Average Daily High by Decade
Full year · complete decades only
Longest Heat Waves — Quincy
| # | Dates | Days | Peak | Avg High | Avg Overnight Low |
|---|---|---|---|---|---|
| 🏆 | Jul 9, 1901 – Jul 28, 1901 | 20 | 111°F (Jul 22) | 102°F | 73°F |
| 2 | Aug 9, 1936 – Aug 28, 1936 | 20 | 109°F (Aug 24) | 104°F | 78°F |
| 3 | Jul 3, 1936 – Jul 20, 1936 | 18 | 114°F (Jul 15) | 104°F | 78°F |
| 4 | Jul 7, 1980 – Jul 20, 1980 | 14 | 105°F (Jul 14) | 100°F | 78°F |
| 5 | Jun 23, 1934 – Jul 6, 1934 | 14 | 104°F (Jun 28) | 100°F | 76°F |
| 6 | Jul 23, 1940 – Aug 5, 1940 | 14 | 104°F (Jul 25) | 100°F | 74°F |
| 7 | Aug 1, 1934 – Aug 12, 1934 | 12 | 111°F (Aug 9) | 103°F | 76°F |
| 8 | May 30, 1934 – Jun 9, 1934 | 11 | 103°F (May 30) | 99°F | 72°F |
| 9 | Jul 12, 1932 – Jul 22, 1932 | 11 | 100°F (Jul 19) | 96°F | 75°F |
| 10 | Aug 1, 1930 – Aug 10, 1930 | 10 | 106°F (Aug 9) | 101°F | 75°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
83rd-warmest month on record
50th-warmest July of 125 on record
+1.8° vs. 76.3° average (1991–2020)Longest 90°F Streak in July
4 consecutive days with highs of at least 90°F (Jul 15–18, 2026, peaking at 93°F)
The longest July streak since 2023 (3 years). The July record is 29 days, set in 1936.
Average July Temperature by Year
1901–2026 · 2026 highlighted
Warmest Julys on Record
| # | Year | Avg Temp |
|---|---|---|
| 1 | 1934 | 88.4°F |
| 2 | 1936 | 87.9°F |
| 3 | 1916 | 84.9°F |
| 4 | 1901 | 84.9°F |
| 5 | 2012 | 83.7°F |
| 6 | 1921 | 83.6°F |
| 7 | 1980 | 83.5°F |
| 8 | 1930 | 83.1°F |
| 9 | 1931 | 82.7°F |
| 10 | 1919 | 82.5°F |
Warmest Months on Record (Any Month)
| # | Month | Avg Temp |
|---|---|---|
| 1 | July 1934 | 88.4°F |
| 2 | July 1936 | 87.9°F |
| 3 | August 1936 | 86.1°F |
| 4 | August 1947 | 86.1°F |
| 5 | July 1916 | 84.9°F |
| 6 | July 1901 | 84.9°F |
| 7 | July 2012 | 83.7°F |
| 8 | July 1921 | 83.6°F |
| 9 | July 1980 | 83.5°F |
| 10 | July 1930 | 83.1°F |
Nearby Stations — July 2026
How the same month ranked at the closest reporting stations
| Station | Avg Temp | July Rank |
|---|---|---|
| Quincy, IL | 78.0°F | 50th of 125 |
| Burlington, IA | 76.7°F | 55th of 127 |
| Columbia, MO | 78.7°F | 55th of 137 |
| Springfield, IL | 76.7°F | 70th of 148 |
| Jefferson City, MO | 79.7°F | 30th of 125 |