Sterling-Dulles Airport, VA

Virginia · Records since 1960–2026

☁️ 59°F Feels like 55°
Currently in Sterling-Dulles Airport
As of 9:45 PM EDT

Records for September 26

🔥 Record High

93°F

September 26, 2007

+18° from 75° normal

❄ Record Low

38°F

September 26, 1983

-16° from 54° normal
🌞 Normal high: 75°F 🌑 Normal low: 54°F 1991–2020 normals

All-Time Records — Sterling-Dulles Airport

🔥
105°F
Hottest Day Ever
Jul 22, 2011
❄
-18°F
Coldest Day Ever
Jan 22, 1984
🌧
10.67"
Wettest Day Ever
Jun 21, 1972
☃
22.5"
Most Snow in One Day
Feb 11, 1983

First & Last Dates — Sterling-Dulles Airport

How early and how late each seasonal turning point has ever arrived, across the full period of record

Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Range ever recorded Normal date (1991–2020)
214 days
Longest growing season
2017
135 days
Shortest growing season
1983
183 days
Normal growing season
1991–2020 average

Top 10 Record Highs — September 26

# Temp Date
🏆 93°F September 26, 2007
2 92°F September 26, 1986
3 91°F September 26, 1972
4 91°F September 26, 1970
5 89°F September 26, 2019
6 89°F September 26, 1998
7 86°F September 26, 2018
8 85°F September 26, 2017
9 84°F September 26, 2025
10 84°F September 26, 1993

Top 5 Record Lows — September 26

# Temp Date
🥶 38°F September 26, 1983
2 38°F September 26, 1964
3 39°F September 26, 1967
4 40°F September 26, 2001
5 41°F September 26, 1987
About this data — Records are sourced from the NOAA Threadex dataset via RCC ACIS, a quality-controlled record for long-term climate stations. Threadex adjusts for station relocations and observation-time changes, making records comparable across all years since 1960–2026. Climate normals represent the 1991–2020 average.

Heat Wave Summary — Sterling-Dulles Airport

threshold: 94°F (90th percentile of historical Jun–Aug highs)
4.2
Avg heat wave length
days (historical)
98°
Avg peak temp
during heat waves
37
Dangerous nights 2026
Overnights ≥ 70°F
2
Heat waves 2026
so far

Days ≥ 90°F Per Year

1960–2026
31
2026 so far
31
Avg/year 1970–2025
41
Avg/year (last 10 complete)
58
Most in a year (2010)

Average 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

65
2026 total
above-normal nights
41.2
Avg / summer
1970–2020
64
Most in a summer
2020

Above-Normal Summer Nights Per Year

Average June–August Low by Decade

Overnight lows · complete decades only

Precipitation

Annual totals and trend across the full period of record · see this year's standing →

Monthly Precipitation — Last 24 Months

Blue = actual · dashed line = monthly normal

Annual Precipitation Per Year (1960–2026)

Blue = above average · tan = below average · gold = 2026 (partial)
Since 1960, annual totals have trended +0.90" per decade, about +5.8" across the record.

Heavy Rain Days Per Year (≥ 1.0")

Compare year-to-year changes in days with heavy rainfall (≥ 1.0")

This Year — 2026

How Sterling-Dulles Airport is tracking against normal, year to date

Daily High Temperature vs Normal

Above normal Below normal

141 of 267 days with data were above the 1991–2020 normal high for their date.

Precipitation, Year to Date

33.01"
2026 YTD
Normal: 32.46"
+0.55"
3.61"
September so far
September normal: 3.94"
-0.33"
7
2026 heavy rain days
Days with ≥ 1.0"

Accumulation vs. Normal

Running total since Jan 1 against the normal pace for the same date · Sterling-Dulles Airport is 0.55" ahead of the normal pace

Period Review — Aug 26 – Sep 25, 2026

Any window, evaluated against every other year on record — 31 days

Quick picks: Last 7 days Last 30 days Last 90 days This month
Seasons: Spring (Mar–May) Summer (Jun–Aug) Fall (Sep–Nov)
73.6°F
Average temperature
7th-warmest of 65
+3.1°
vs. average
Normal: 70.5°F (1991–2020)

Average Temperature by Year — Aug 26 – Sep 25

1962–2026 · 2026 highlighted · trend +0.56° per decade (warming since 1962)

Precipitation by Year — Aug 26 – Sep 25

1962–2025 · 2026 highlighted · trend -0.02" per decade (drier since 1962)

Warmest Aug 26 – Sep 25 on Record

# Year Avg Temp
1 2016 75.8°F
2 2018 74.7°F
3 1980 74.3°F
4 1998 74.2°F
5 2023 74.1°F
6 2005 73.6°F
7 2026 73.6°F
8 1993 73.1°F
9 1978 73.0°F
10 2021 73.0°F

Coolest Aug 26 – Sep 25 on Record

# Year Avg Temp
1 1967 65.6°F
2 1986 65.9°F
3 1966 66.6°F
4 1976 66.6°F
5 1984 66.7°F
6 1975 66.7°F
7 1968 66.7°F
8 1963 66.7°F
9 1997 66.8°F
10 1969 67.0°F
About this data. Pick any start and end date and this becomes the same kind of review as the Month and Fall tabs, just for exactly the window you asked for — the generalized version of the same engine, evaluated across every year on record. Average temperature is the mean of each day's (high + low) / 2; precipitation is the sum of daily totals. A year missing more than about a fifth of the window's days is excluded from the temperature ranking; any missing day excludes a year from the precipitation ranking, since an unreported day is unreported rain. Ranges that cross from December into January aren't supported yet. Normals are the 1991–2020 mean for the same window.
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