Spencer, IA
Iowa · Records since 1895–2026
Records for August 11
🔥 Record High
August 11, 1947
+16° from 82° normal❄ Record Low
August 11, 2004
-15° from 60° normalAll-Time Records — Spencer
Top 10 Record Highs — August 11
| # | Temp | Date |
|---|---|---|
| 🏆 | 98°F | August 11, 1947 |
| 2 | 98°F | August 11, 1935 |
| 3 | 97°F | August 11, 1936 |
| 4 | 95°F | August 11, 1995 |
| 5 | 95°F | August 11, 1941 |
| 6 | 94°F | August 11, 1988 |
| 7 | 94°F | August 11, 1923 |
| 8 | 93°F | August 11, 1958 |
| 9 | 92°F | August 11, 1975 |
| 10 | 91°F | August 11, 2010 |
Top 5 Record Lows — August 11
| # | Temp | Date |
|---|---|---|
| 🥶 | 45°F | August 11, 2004 |
| 2 | 45°F | August 11, 1982 |
| 3 | 45°F | August 11, 1967 |
| 4 | 45°F | August 11, 1931 |
| 5 | 45°F | August 11, 1924 |
Heat Wave Summary — Spencer
threshold: 93°F (90th percentile of historical Jun–Aug highs)2026 Daily High Temperature vs Normal
Year to date127 of 221 days with data were above the 1991–2020 normal high for their date.
Days ≥ 90°F Per Year
1895–2026Average Daily High by Decade
Full year · complete decades only
Longest Heat Waves — Spencer
| # | Dates | Days | Peak | Avg High | Avg Overnight Low |
|---|---|---|---|---|---|
| 🏆 | Jul 4, 1936 – Jul 19, 1936 | 16 | 113°F (Jul 17) | 106°F | 70°F |
| 2 | Jul 12, 1932 – Jul 22, 1932 | 11 | 100°F (Jul 20) | 96°F | 69°F |
| 3 | Jul 31, 1930 – Aug 8, 1930 | 9 | 111°F (Aug 3) | 99°F | 69°F |
| 4 | Jul 4, 1930 – Jul 12, 1930 | 9 | 106°F (Jul 9) | 101°F | 69°F |
| 5 | Jul 25, 1987 – Aug 2, 1987 | 9 | 100°F (Jul 30) | 97°F | 70°F |
| 6 | Sep 5, 1931 – Sep 13, 1931 | 9 | 99°F (Sep 10) | 96°F | 69°F |
| 7 | Jul 28, 1955 – Aug 5, 1955 | 9 | 99°F (Jul 30) | 96°F | 71°F |
| 8 | Jul 21, 1936 – Jul 28, 1936 | 8 | 106°F (Jul 22) | 99°F | 67°F |
| 9 | Jul 18, 1940 – Jul 25, 1940 | 8 | 106°F (Jul 24) | 102°F | 72°F |
| 10 | Aug 13, 1972 – Aug 20, 1972 | 8 | 95°F (Aug 17) | 94°F | 69°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
65th-warmest month on record
47th-warmest July of 110 on record
+1.3° vs. 72.8° average (1991–2020)Longest 90°F Streak in July
5 consecutive days with highs of at least 90°F (Jul 25–29, 2026, peaking at 96°F)
Ties the longest July streak since 2023 (3 years). The July record is 18 days, set in 1936.
Average July Temperature by Year
1896–2026 · 2026 highlighted
Warmest Julys on Record
| # | Year | Avg Temp |
|---|---|---|
| 1 | 1936 | 83.6°F |
| 2 | 1935 | 79.3°F |
| 3 | 1930 | 78.9°F |
| 4 | 2012 | 78.7°F |
| 5 | 1921 | 77.8°F |
| 6 | 2011 | 77.7°F |
| 7 | 1955 | 77.6°F |
| 8 | 1974 | 77.4°F |
| 9 | 1957 | 77.2°F |
| 10 | 1923 | 76.9°F |
Warmest Months on Record (Any Month)
| # | Month | Avg Temp |
|---|---|---|
| 1 | July 1936 | 83.6°F |
| 2 | July 1935 | 79.3°F |
| 3 | July 1930 | 78.9°F |
| 4 | July 2012 | 78.7°F |
| 5 | August 1936 | 78.6°F |
| 6 | August 1937 | 78.2°F |
| 7 | July 1921 | 77.8°F |
| 8 | June 1933 | 77.8°F |
| 9 | July 2011 | 77.7°F |
| 10 | July 1955 | 77.6°F |
Nearby Stations — July 2026
How the same month ranked at the closest reporting stations
| Station | Avg Temp | July Rank |
|---|---|---|
| Spencer, IA | 74.1°F | 47th of 110 |
| Sioux City, IA | 77.3°F | 33rd of 138 |
| Sioux Falls, SD | 77.1°F | 19th of 134 |
| Des Moines, IA | 78.4°F | 29th of 148 |
| Omaha, NE | 80.4°F | 16th of 156 |