United States · 1991–2020

Best time to visit
Dunn Loring.

September leads for comfortable weather in Dunn Loring: typically 24.8°C by day, 14.6°C at night, with 101 mm of rain. Based on measured 1991–2020 NOAA station history.

Best comfortSeptember

Typical high24.8°C

Typical low14.6°C

Rain in September101 mm

Comfort

September

September · May · June

84climate match

Beach

August

August · July · June

78climate match

Outdoors

October

October · April · May

80climate match

The weakest month is January, scoring 5 against September’s 84 — days reach only 5.7°C, 18° below the 24°C the score treats as ideal.

Month by month

The whole year,
without the guesswork.

The bars show the comfort score. Day and night temperatures come from daily observed highs and lows; rain is the historical monthly estimate.

Jan

55.7° / -4°

Feb

57.6° / -3°

Mar

2112° / 0.5°

Apr

5418.6° / 6.1°

May

7222.4° / 11.6°

Jun

7226.8° / 16.7°

Jul

6129° / 19.2°

Aug

6828.3° / 18.6°

Sep

8424.8° / 14.6°

Oct

6018.8° / 8.2°

Nov

3313.3° / 2.3°

Dec

57.8° / -1.5°

Monthly climate evidence for Dunn Loring — daylight is calculated from latitude, everything else is measured
Month	Day	Night	Rain	Wet days	Daylight	Comfort	Coverage
January	5.7°C	-4°C	82 mm	8.6	9 h 43	5	Strong coverage
February	7.6°C	-3°C	66 mm	7.1	10 h 41	5	Good coverage
March	12°C	0.5°C	96 mm	8.2	11 h 50	21	Strong coverage
April	18.6°C	6.1°C	86 mm	8.2	13 h 10	54	Good coverage
May	22.4°C	11.6°C	110 mm	10.1	14 h 16	72	Strong coverage
June	26.8°C	16.7°C	106 mm	9.1	14 h 53	72	Strong coverage
July	29°C	19.2°C	107 mm	8.2	14 h 38	61	Strong coverage
August	28.3°C	18.6°C	85 mm	7.4	13 h 41	68	Strong coverage
September	24.8°C	14.6°C	101 mm	7.1	12 h 24	84	Strong coverage
October	18.8°C	8.2°C	85 mm	7.1	11 h 07	60	Strong coverage
November	13.3°C	2.3°C	74 mm	6.3	10 h	33	Strong coverage
December	7.8°C	-1.5°C	86 mm	8	9 h 27	5	Strong coverage

Records at VIENNA, 1948–2026
Month	Record high	Record low	Wettest day	Wettest / driest month	Years
January	24.4°C27 Jan 2024	-17.2°C7 Jan 2014	54 mm10 Jan 2024	171 mm2024 · driest 26 mm in 2018	32
February	26.1°C26 Feb 2000	-19.4°C5 Feb 1996	62 mm5 Feb 1998	182 mm1998 · driest 6 mm in 2017	31
March	31.7°C31 Mar 1998	-15.0°C4 Mar 2014	61 mm22 Mar 2019	155 mm1998 · driest 3 mm in 2006	31
April	32.8°C18 Apr 2002	-4.4°C4 Apr 2013	91 mm21 Apr 2008	171 mm2008 · driest 35 mm in 2026	30
May	33.3°C31 May 2006	0.6°C10 May 2020	118 mm26 May 1997	206 mm2025 · driest 15 mm in 2007	31
June	36.7°C29 Jun 2014	6.1°C2 Jun 2001	82 mm21 Jun 2015	290 mm2006 · driest 15 mm in 2024	31
July	36.7°C19 Jul 2012	11.7°C8 Jul 2000	100 mm22 Jul 2018	223 mm2018 · driest 30 mm in 1999	31
August	37.8°C18 Aug 2015	10.0°C16 Aug 2013	112 mm11 Aug 2001	186 mm2020 · driest 5 mm in 1998	30
September	36.7°C7 Sep 2014	5.0°C18 Sep 2013	108 mm9 Sep 2011	283 mm1999 · driest 5 mm in 2005	30
October	31.7°C3 Oct 2019	-1.7°C23 Oct 1997	136 mm8 Oct 2005	230 mm2005 · driest 1 mm in 2000	31
November	27.2°C7 Nov 2024	-8.3°C25 Nov 2013	69 mm9 Nov 1996	175 mm1948 · driest 7 mm in 2016	31
December	25.6°C8 Dec 1998	-15.0°C24 Dec 2022	64 mm16 Dec 2018	173 mm2009 · driest 14 mm in 2017	32

Typical days per month at VIENNA, 1991–2020
Month	Days 25°C+	Days 30°C+	Frost nights	Heavy rain (10 mm+)	Snow days
January	0	0	24	3	3
February	<1	0	22	2	3
March	1	0	16	3	1
April	5	<1	3	3	0
May	11	3	0	4	0
June	21	7	0	4	0
July	28	14	0	3	0
August	27	11	0	2	0
September	15	3	0	3	0
October	4	<1	1	3	0
November	<1	0	11	2	<1
December	<1	0	21	3	2

How often, not how much — every day in VIENNA’s record sorted by what it was actually like, rather than averaged
Month	Warm & dry days	Wet days	Washouts	Week with 3+ wet days	Daytime mean has ranged
January	1%	27%	9%	28%	2.5–9.0°C
February	3%	26%	9%	30%	4.0–11.0°C
March	13%	27%	10%	30%	8.7–15.5°C
April	33%	28%	10%	33%	17.1–20.5°C
May	48%	33%	12%	43%	20.1–24.6°C
June	68%	29%	11%	32%	25.1–27.9°C
July	73%	28%	11%	32%	27.2–31.0°C
August	74%	27%	10%	26%	26.2–29.7°C
September	70%	24%	10%	24%	23.0–26.9°C
October	34%	21%	9%	19%	17.1–20.8°C
November	11%	23%	9%	22%	10.0–16.3°C
December	2%	24%	9%	26%	5.1–10.7°C

A warm and dry day reaches 20°C with under 1 mm of rain; a wet day gets 1 mm or more; a washout gets 10 mm or more. The week column is the share of seven-day stretches in that month, across the station’s whole daily record, that contained three or more wet days — the odds a week-long trip is rained on repeatedly, counted rather than modelled. The last column is the 10th to 90th percentile of that month’s daytime average across individual years: a narrow band means the average is what you will get, a wide one means the average is a midpoint between years that felt quite different.

1996Each stripe is one year’s mean temperature against the 28-year average. Warmest: 1998. Coolest: 2013.2025

The evidence behind this page

Nearby, measured,
and named.

Place identity: GeoNames 4756736
NOAA station: USC00448737 · VIENNA
Station distance: 5.8 km from the place centre
Climate period: 1991–2020
Minimum month coverage: 24 usable years
Daylight: Calculated from latitude 38.89°, mid-month, sunrise to sunset including refraction. Not a station measurement.
Important limit: Historical climate is not a forecast. Nearby stations can miss mountains, coasts, and local microclimates.

These places read the same station, so their numbers are identical — distance from VIENNA is what differs

Reston→Burke→Annandale→Oakton→Springfield→West Falls Church→

Or put two places side by side: Dunn Loring vs Reston

Best time to visitDunn Loring.