Sterling-Dulles Airport, VA
Virginia · Records since 1960–2026
Records for August 11
🔥 Record High
August 11, 2021
+12° from 87° normal❄ Record Low
August 11, 1972
-19° from 66° normalAll-Time Records — Sterling-Dulles Airport
Top 10 Record Highs — August 11
| # | Temp | Date |
|---|---|---|
| 🏆 | 99°F | August 11, 2021 |
| 2 | 97°F | August 11, 2010 |
| 3 | 96°F | August 11, 1980 |
| 4 | 95°F | August 11, 2016 |
| 5 | 95°F | August 11, 2002 |
| 6 | 95°F | August 11, 1999 |
| 7 | 94°F | August 11, 1983 |
| 8 | 93°F | August 11, 1992 |
| 9 | 93°F | August 11, 1981 |
| 10 | 92°F | August 11, 2020 |
Top 5 Record Lows — August 11
| # | Temp | Date |
|---|---|---|
| 🥶 | 47°F | August 11, 1972 |
| 2 | 53°F | August 11, 1962 |
| 3 | 54°F | August 11, 1976 |
| 4 | 55°F | August 11, 1974 |
| 5 | 55°F | August 11, 1968 |
Heat Wave Summary — Sterling-Dulles Airport
threshold: 94°F (90th percentile of historical Jun–Aug highs)2026 Daily High Temperature vs Normal
Year to date117 of 221 days with data were above the 1991–2020 normal high for their date.
Days ≥ 90°F Per Year
1960–2026Average Daily High by Decade
Full year · complete decades only
Longest Heat Waves — Sterling-Dulles Airport
| # | Dates | Days | Peak | Avg High | Avg Overnight Low |
|---|---|---|---|---|---|
| 🏆 | Jul 3, 1993 – Jul 11, 1993 | 9 | 100°F (Jul 8) | 97°F | 70°F |
| 2 | Jul 13, 1997 – Jul 19, 1997 | 7 | 100°F (Jul 17) | 96°F | 65°F |
| 3 | Jul 30, 1995 – Aug 5, 1995 | 7 | 99°F (Aug 5) | 96°F | 68°F |
| 4 | Aug 11, 2016 – Aug 17, 2016 | 7 | 99°F (Aug 13) | 96°F | 74°F |
| 5 | Jul 4, 2024 – Jul 10, 2024 | 7 | 99°F (Jul 6) | 97°F | 75°F |
| 6 | Aug 25, 1993 – Aug 31, 1993 | 7 | 98°F (Aug 28) | 95°F | 70°F |
| 7 | Jul 6, 1988 – Jul 11, 1988 | 6 | 101°F (Jul 7) | 99°F | 65°F |
| 8 | Jul 18, 1991 – Jul 23, 1991 | 6 | 101°F (Jul 21) | 97°F | 71°F |
| 9 | Jul 3, 2012 – Jul 8, 2012 | 6 | 101°F (Jul 7) | 98°F | 73°F |
| 10 | Jul 22, 2016 – Jul 27, 2016 | 6 | 100°F (Jul 25) | 96°F | 72°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
15th-warmest month on record
14th-warmest July of 65 on record
+1.6° vs. 77.2° average (1991–2020)Longest 90°F Streak in July
5 consecutive days with highs of at least 90°F (Jul 1–5, 2026, peaking at 99°F)
The longest July streak since 2025 (1 year). The July record is 14 days, set in 2011.
Average July Temperature by Year
1962–2026 · 2026 highlighted
Warmest Julys on Record
| # | Year | Avg Temp |
|---|---|---|
| 1 | 2011 | 81.0°F |
| 2 | 2020 | 81.0°F |
| 3 | 2024 | 80.8°F |
| 4 | 2012 | 80.6°F |
| 5 | 2025 | 80.1°F |
| 6 | 2023 | 80.1°F |
| 7 | 1993 | 79.7°F |
| 8 | 1994 | 79.5°F |
| 9 | 2016 | 79.5°F |
| 10 | 2010 | 79.5°F |
Warmest Months on Record (Any Month)
| # | Month | Avg Temp |
|---|---|---|
| 1 | July 2011 | 81.0°F |
| 2 | July 2020 | 81.0°F |
| 3 | July 2024 | 80.8°F |
| 4 | July 2012 | 80.6°F |
| 5 | July 2025 | 80.1°F |
| 6 | July 2023 | 80.1°F |
| 7 | July 1993 | 79.7°F |
| 8 | July 1994 | 79.5°F |
| 9 | July 2016 | 79.5°F |
| 10 | July 2010 | 79.5°F |
Nearby Stations — July 2026
How the same month ranked at the closest reporting stations
| Station | Avg Temp | July Rank |
|---|---|---|
| Sterling-Dulles Airport, VA | 78.7°F | 14th of 65 |
| Washington, DC | 81.7°F | 17th of 155 |
| Hagerstown, MD | 77.8°F | 20th of 128 |
| Baltimore, MD | 78.9°F | 47th of 154 |