Sterling-Dulles Airport, VA

38.935°N, 77.447°W · station IADthr · 1960–2026 · 67 years · normal 43.3 in/yr

The Accumulation Ribbon

Every day of the year at Sterling-Dulles Airport: how the rain adds up. The filled curve is the normal running total; the dashed lines are the wettest (2018) and driest (2007) years on record; the white line is 2026 so far.

Normal to date Wettest / driest year 2026 so far normal annual 43.3 in

All-Time Extremes

Wettest day ever

10.67in

Jun 21, 1972

Wettest month ever

18.19in

Jun 1972

Wettest year

66.7in

2018 · mean 41.2 in

Driest year

27.0in

2007 · mean 41.2 in

Longest dry streak

38 days

< 0.01 in · ended 2024-11-09

Longest wet streak

9 days

≥ 0.01 in · ended 1968-11-12

Records by Month

Month	Wettest day	Normal	Wettest month
Jan	2.00″ Jan 30, 2013	2.59″	6.61″ 1979
Feb	2.33″ Feb 16, 2003	2.49″	6.27″ 2003
Mar	2.69″ Mar 21, 2019	3.35″	7.65″ 1993
Apr	3.99″ Apr 30, 2014	2.82″	7.41″ 2014
May	3.73″ May 11, 2008	4.20″	10.26″ 1988
Jun	10.67″ Jun 21, 1972	3.63″	18.19″ 1972
Jul	5.02″ Jul 21, 2018	3.09″	11.21″ 2018
Aug	4.68″ Aug 11, 1984	3.75″	10.71″ 1984
Sep	5.52″ Sep 14, 1966	3.14″	11.26″ 1975
Oct	4.26″ Oct 29, 2012	2.77″	9.22″ 2005
Nov	2.59″ Nov 27, 1993	2.66″	7.83″ 1963
Dec	2.92″ Dec 18, 1977	2.97″	6.74″ 1969

Record Daily Rainfall

The heaviest one-day rainfall ever recorded on each calendar date — when Sterling-Dulles Airport's big rains fall.

Year by Year

Wettest years

2018	66.74 in
2003	65.67 in
1972	59.05 in
1996	58.09 in
1979	55.43 in

The Full Record

Every day of the year: normal daily precip, the record one-day total with its year, how often it rains, and the cumulative normal. Type to filter, click a column to sort.

Show me the data — the full daily record

Date	Normal	Record 1-day	Yr	Wet-day %	Cum. normal
Jan 1	0.09″	1.73″	2003	40%	0.09″
Jan 2	0.09″	1.40″	1979	28%	0.18″
Jan 3	0.09″	1.37″	1999	34%	0.26″
Jan 4	0.09″	0.89″	1992	31%	0.35″
Jan 5	0.09″	1.11″	1993	29%	0.44″
Jan 6	0.09″	0.97″	2024	38%	0.53″
Jan 7	0.10″	1.56″	1996	37%	0.63″
Jan 8	0.10″	1.07″	1978	36%	0.72″
Jan 9	0.10″	1.76″	2024	42%	0.82″
Jan 10	0.10″	1.21″	2026	28%	0.92″
Jan 11	0.10″	0.90″	1991	39%	1.01″
Jan 12	0.10″	0.91″	2018	34%	1.11″
Jan 13	0.10″	1.03″	1964	33%	1.21″
Jan 14	0.09″	1.79″	2005	31%	1.30″
Jan 15	0.09″	1.56″	1995	29%	1.39″
Jan 16	0.10″	1.12″	2022	18%	1.48″
Jan 17	0.10″	1.14″	1994	34%	1.58″
Jan 18	0.10″	1.18″	1980	30%	1.69″
Jan 19	0.10″	1.36″	1987	38%	1.79″
Jan 20	0.10″	1.01″	1979	38%	1.89″
Jan 21	0.10″	0.94″	1974	28%	1.99″
Jan 22	0.10″	1.18″	1987	34%	2.08″
Jan 23	0.10″	1.88″	2016	33%	2.18″
Jan 24	0.09″	1.33″	2019	40%	2.27″
Jan 25	0.09″	1.84″	2026	38%	2.36″
Jan 26	0.09″	1.31″	2011	31%	2.45″
Jan 27	0.09″	0.95″	1976	27%	2.55″
Jan 28	0.10″	1.64″	1998	25%	2.65″
Jan 29	0.10″	0.95″	1990	26%	2.75″
Jan 30	0.11″	2.00″	2013	30%	2.85″
Jan 31	0.10″	0.84″	2025	17%	2.95″
Feb 1	0.09″	1.44″	2008	30%	3.04″
Feb 2	0.08″	1.23″	1973	44%	3.12″
Feb 3	0.09″	1.33″	2014	34%	3.21″
Feb 4	0.09″	2.17″	1998	29%	3.30″
Feb 5	0.09″	1.47″	2010	28%	3.38″
Feb 6	0.09″	1.98″	2010	36%	3.48″
Feb 7	0.09″	1.53″	1965	31%	3.57″
Feb 8	0.09″	0.84″	1997	22%	3.66″
Feb 9	0.10″	1.07″	1970	23%	3.76″
Feb 10	0.10″	0.65″	1970	33%	3.86″
Feb 11	0.10″	2.07″	1983	34%	3.96″
Feb 12	0.09″	1.77″	1985	42%	4.05″
Feb 13	0.09″	1.29″	1972	35%	4.14″
Feb 14	0.08″	1.27″	1984	27%	4.22″
Feb 15	0.09″	0.59″	2026	32%	4.31″
Feb 16	0.09″	2.33″	2003	35%	4.40″
Feb 17	0.09″	1.36″	1998	31%	4.49″
Feb 18	0.09″	1.29″	1964	29%	4.59″
Feb 19	0.09″	1.34″	1972	30%	4.68″
Feb 20	0.09″	1.02″	1996	31%	4.77″
Feb 21	0.09″	0.93″	2015	27%	4.85″
Feb 22	0.09″	1.69″	2003	41%	4.94″
Feb 23	0.10″	1.34″	1987	39%	5.04″
Feb 24	0.10″	1.52″	1979	38%	5.13″
Feb 25	0.10″	1.20″	1979	36%	5.23″
Feb 26	0.10″	0.93″	1962	32%	5.33″
Feb 27	0.10″	0.60″	2000	26%	5.43″
Feb 28	0.10″	1.13″	1966	34%	5.53″
Feb 29	0.11″	1.35″	2012	29%	5.64″
Mar 1	0.10″	1.51″	1994	32%	5.74″
Mar 2	0.10″	1.43″	1997	37%	5.85″
Mar 3	0.10″	2.16″	1993	38%	5.95″
Mar 4	0.10″	1.41″	1965	36%	6.05″
Mar 5	0.10″	2.30″	2011	37%	6.15″
Mar 6	0.11″	1.53″	1967	38%	6.26″
Mar 7	0.10″	1.16″	1995	26%	6.36″
Mar 8	0.10″	0.83″	1999	28%	6.46″
Mar 9	0.10″	1.41″	2011	29%	6.56″
Mar 10	0.09″	0.82″	1963	25%	6.65″
Mar 11	0.09″	1.16″	2013	28%	6.74″
Mar 12	0.10″	1.63″	1977	31%	6.85″
Mar 13	0.11″	1.01″	1984	35%	6.95″
Mar 14	0.11″	0.89″	1967	28%	7.06″
Mar 15	0.11″	1.56″	2007	37%	7.17″
Mar 16	0.10″	1.14″	1993	31%	7.28″
Mar 17	0.10″	1.16″	1998	32%	7.38″
Mar 18	0.11″	1.07″	1975	31%	7.48″
Mar 19	0.11″	1.81″	2003	38%	7.59″
Mar 20	0.12″	2.69″	2019	40%	7.71″
Mar 21	0.12″	1.29″	2000	26%	7.83″
Mar 22	0.12″	2.21″	1991	25%	7.96″
Mar 23	0.12″	1.79″	1979	32%	8.08″
Mar 24	0.13″	0.53″	1978	25%	8.21″
Mar 25	0.13″	0.99″	1978	34%	8.34″
Mar 26	0.13″	1.55″	1988	29%	8.46″
Mar 27	0.12″	1.36″	2005	37%	8.58″
Mar 28	0.10″	1.40″	1984	42%	8.69″
Mar 29	0.11″	1.24″	1974	37%	8.79″
Mar 30	0.10″	1.55″	2017	45%	8.89″
Mar 31	0.10″	1.64″	1973	43%	9.00″
Apr 1	0.11″	2.07″	2005	45%	9.11″
Apr 2	0.11″	1.36″	1960	35%	9.22″
Apr 3	0.10″	1.47″	1987	28%	9.32″
Apr 4	0.10″	1.42″	1984	45%	9.42″
Apr 5	0.10″	1.75″	1960	29%	9.52″
Apr 6	0.10″	0.68″	2003	32%	9.61″
Apr 7	0.10″	1.33″	1988	36%	9.71″
Apr 8	0.11″	1.15″	2000	41%	9.82″
Apr 9	0.10″	0.84″	1983	29%	9.92″
Apr 10	0.10″	0.74″	2009	29%	10.02″
Apr 11	0.11″	1.06″	1966	36%	10.13″
Apr 12	0.11″	1.45″	2004	33%	10.24″
Apr 13	0.12″	2.13″	1970	33%	10.36″
Apr 14	0.13″	1.96″	1983	38%	10.49″
Apr 15	0.13″	2.43″	1993	29%	10.62″
Apr 16	0.12″	0.71″	1984	33%	10.74″
Apr 17	0.13″	1.44″	2000	21%	10.87″
Apr 18	0.12″	1.26″	2019	38%	10.99″
Apr 19	0.13″	1.63″	2009	21%	11.12″
Apr 20	0.13″	2.90″	2008	33%	11.25″
Apr 21	0.13″	2.88″	2006	35%	11.38″
Apr 22	0.13″	1.14″	1972	34%	11.51″
Apr 23	0.12″	1.25″	1983	42%	11.63″
Apr 24	0.13″	1.34″	1973	45%	11.75″
Apr 25	0.13″	0.83″	1982	33%	11.88″
Apr 26	0.13″	1.65″	1973	33%	12.01″
Apr 27	0.14″	1.68″	2002	38%	12.14″
Apr 28	0.13″	1.19″	2014	35%	12.27″
Apr 29	0.12″	3.99″	2014	30%	12.40″
Apr 30	0.12″	1.42″	1981	38%	12.52″
May 1	0.13″	0.99″	1962	38%	12.65″
May 2	0.13″	1.39″	2016	41%	12.78″
May 3	0.14″	1.03″	1984	48%	12.92″
May 4	0.14″	2.34″	1989	41%	13.06″
May 5	0.14″	1.61″	1988	39%	13.20″
May 6	0.14″	1.51″	1967	35%	13.35″
May 7	0.15″	0.86″	1998	41%	13.49″
May 8	0.15″	2.10″	1960	44%	13.65″
May 9	0.16″	1.61″	1990	32%	13.81″
May 10	0.17″	1.73″	2017	29%	13.97″
May 11	0.16″	3.73″	2008	47%	14.13″
May 12	0.15″	1.93″	1971	42%	14.29″
May 13	0.15″	1.87″	2018	39%	14.44″
May 14	0.16″	2.40″	2003	40%	14.60″
May 15	0.17″	1.97″	2014	48%	14.77″
May 16	0.17″	1.22″	1970	42%	14.93″
May 17	0.17″	0.91″	1996	47%	15.10″
May 18	0.17″	3.13″	1988	44%	15.28″
May 19	0.17″	1.86″	2005	36%	15.45″
May 20	0.17″	1.06″	2003	37%	15.62″
May 21	0.17″	2.07″	2001	37%	15.79″
May 22	0.16″	2.40″	2010	37%	15.95″
May 23	0.15″	1.41″	2012	48%	16.10″
May 24	0.15″	1.76″	1997	47%	16.25″
May 25	0.14″	3.59″	2009	33%	16.39″
May 26	0.16″	1.24″	2002	47%	16.54″
May 27	0.16″	2.16″	1982	48%	16.71″
May 28	0.17″	1.24″	1968	38%	16.87″
May 29	0.16″	1.33″	1971	34%	17.03″
May 30	0.16″	2.65″	1960	32%	17.19″
May 31	0.15″	1.22″	1969	35%	17.34″
Jun 1	0.15″	2.93″	1969	38%	17.49″
Jun 2	0.14″	4.34″	1991	47%	17.62″
Jun 3	0.13″	0.99″	2016	35%	17.76″
Jun 4	0.14″	1.63″	2008	32%	17.90″
Jun 5	0.15″	1.83″	1983	33%	18.05″
Jun 6	0.14″	1.88″	1989	32%	18.19″
Jun 7	0.14″	1.71″	2014	27%	18.34″
Jun 8	0.15″	0.66″	1977	29%	18.48″
Jun 9	0.15″	1.16″	2009	29%	18.63″
Jun 10	0.14″	1.07″	2020	30%	18.77″
Jun 11	0.14″	1.29″	2003	36%	18.91″
Jun 12	0.14″	2.03″	1982	43%	19.05″
Jun 13	0.14″	1.51″	2025	35%	19.18″
Jun 14	0.14″	1.52″	2025	33%	19.32″
Jun 15	0.14″	1.78″	1974	36%	19.46″
Jun 16	0.14″	2.82″	2016	35%	19.61″
Jun 17	0.15″	1.14″	1991	36%	19.76″
Jun 18	0.15″	1.99″	2003	44%	19.92″
Jun 19	0.15″	1.49″	1962	39%	20.07″
Jun 20	0.15″	1.35″	1994	35%	20.22″
Jun 21	0.15″	10.67″	1972	38%	20.37″
Jun 22	0.14″	1.96″	1972	38%	20.51″
Jun 23	0.14″	1.76″	1994	23%	20.65″
Jun 24	0.14″	5.94″	2006	23%	20.79″
Jun 25	0.13″	1.92″	2006	32%	20.92″
Jun 26	0.13″	1.47″	2006	38%	21.05″
Jun 27	0.13″	1.99″	2026	35%	21.18″
Jun 28	0.14″	2.70″	1975	30%	21.32″
Jun 29	0.13″	1.30″	1972	30%	21.45″
Jun 30	0.14″	1.25″	1972	48%	21.59″
Jul 1	0.14″	0.76″	1984	35%	21.73″
Jul 2	0.13″	2.36″	1968	32%	21.87″
Jul 3	0.13″	1.87″	2001	36%	22.00″
Jul 4	0.13″	1.43″	2005	33%	22.13″
Jul 5	0.13″	1.68″	2017	38%	22.25″
Jul 6	0.14″	1.59″	2005	32%	22.39″
Jul 7	0.14″	1.96″	2005	33%	22.53″
Jul 8	0.13″	2.23″	1970	33%	22.66″
Jul 9	0.13″	1.63″	1995	36%	22.80″
Jul 10	0.13″	3.71″	2013	32%	22.93″
Jul 11	0.12″	2.61″	1990	29%	23.06″
Jul 12	0.12″	1.79″	1964	40%	23.17″
Jul 13	0.12″	1.56″	2002	38%	23.29″
Jul 14	0.12″	1.47″	1960	31%	23.42″
Jul 15	0.12″	1.65″	1989	26%	23.53″
Jul 16	0.12″	1.11″	2018	29%	23.65″
Jul 17	0.12″	1.66″	2017	22%	23.77″
Jul 18	0.12″	0.96″	2023	28%	23.89″
Jul 19	0.13″	2.28″	1970	26%	24.02″
Jul 20	0.13″	5.02″	2018	32%	24.15″
Jul 21	0.13″	2.25″	1969	35%	24.28″
Jul 22	0.13″	1.64″	2020	43%	24.41″
Jul 23	0.13″	1.51″	1988	38%	24.54″
Jul 24	0.14″	1.36″	2018	38%	24.68″
Jul 25	0.14″	1.54″	1992	31%	24.82″
Jul 26	0.14″	3.50″	1994	35%	24.96″
Jul 27	0.14″	1.46″	2017	43%	25.09″
Jul 28	0.13″	1.65″	2000	46%	25.23″
Jul 29	0.13″	1.29″	2018	31%	25.36″
Jul 30	0.13″	1.87″	1978	38%	25.49″
Jul 31	0.13″	1.82″	1992	41%	25.62″
Aug 1	0.12″	0.90″	2000	28%	25.74″
Aug 2	0.12″	1.37″	2004	33%	25.86″
Aug 3	0.11″	0.83″	1967	44%	25.97″
Aug 4	0.11″	1.87″	2020	38%	26.08″
Aug 5	0.11″	2.49″	1986	36%	26.19″
Aug 6	0.11″	1.22″	1988	34%	26.30″
Aug 7	0.12″	2.33″	2000	27%	26.41″
Aug 8	0.11″	2.28″	1969	33%	26.53″
Aug 9	0.12″	0.96″	2022	31%	26.65″
Aug 10	0.13″	2.38″	1984	38%	26.78″
Aug 11	0.13″	4.68″	1984	28%	26.91″
Aug 12	0.13″	2.07″	1996	30%	27.03″
Aug 13	0.14″	0.77″	1970	33%	27.17″
Aug 14	0.13″	2.18″	2019	28%	27.30″
Aug 15	0.13″	1.74″	1976	31%	27.43″
Aug 16	0.13″	3.32″	1997	39%	27.56″
Aug 17	0.13″	1.39″	2010	42%	27.69″
Aug 18	0.13″	1.54″	1967	36%	27.82″
Aug 19	0.13″	2.17″	1963	41%	27.95″
Aug 20	0.12″	2.72″	2018	34%	28.07″
Aug 21	0.12″	0.94″	2009	22%	28.20″
Aug 22	0.12″	1.60″	2001	23%	28.32″
Aug 23	0.12″	3.88″	1967	22%	28.43″
Aug 24	0.11″	3.03″	1999	22%	28.54″
Aug 25	0.11″	1.48″	1965	22%	28.65″
Aug 26	0.11″	1.98″	1971	27%	28.76″
Aug 27	0.10″	1.73″	2002	23%	28.86″
Aug 28	0.10″	1.30″	2020	22%	28.96″
Aug 29	0.10″	1.92″	2024	30%	29.06″
Aug 30	0.12″	3.21″	1975	20%	29.18″
Aug 31	0.13″	2.76″	2006	28%	29.31″
Sep 1	0.13″	0.97″	1969	30%	29.43″
Sep 2	0.13″	1.47″	1969	25%	29.56″
Sep 3	0.12″	1.00″	1999	27%	29.69″
Sep 4	0.12″	3.78″	1979	31%	29.81″
Sep 5	0.12″	1.32″	1974	30%	29.93″
Sep 6	0.11″	5.11″	2008	30%	30.04″
Sep 7	0.11″	3.56″	1987	27%	30.15″
Sep 8	0.11″	1.40″	2018	27%	30.26″
Sep 9	0.12″	0.84″	1997	23%	30.38″
Sep 10	0.12″	1.50″	1968	25%	30.50″
Sep 11	0.12″	1.18″	1965	27%	30.62″
Sep 12	0.11″	0.68″	1983	23%	30.73″
Sep 13	0.12″	5.52″	1966	23%	30.85″
Sep 14	0.10″	1.06″	1981	23%	30.95″
Sep 15	0.10″	2.05″	1999	31%	31.04″
Sep 16	0.10″	1.00″	2018	31%	31.14″
Sep 17	0.10″	1.76″	2003	28%	31.23″
Sep 18	0.11″	1.17″	2012	27%	31.35″
Sep 19	0.12″	1.26″	2000	25%	31.47″
Sep 20	0.13″	2.59″	1979	28%	31.59″
Sep 21	0.14″	1.57″	1982	39%	31.73″
Sep 22	0.15″	1.74″	2003	28%	31.88″
Sep 23	0.15″	2.17″	2001	19%	32.03″
Sep 24	0.14″	2.67″	1975	31%	32.17″
Sep 25	0.14″	2.30″	2000	44%	32.31″
Sep 26	0.14″	1.69″	2024	36%	32.45″
Sep 27	0.14″	0.97″	1974	41%	32.58″
Sep 28	0.13″	2.23″	1963	28%	32.71″
Sep 29	0.14″	4.74″	2010	28%	32.85″
Sep 30	0.14″	4.06″	1979	43%	32.98″
Oct 1	0.13″	1.18″	1973	35%	33.12″
Oct 2	0.14″	2.35″	2012	29%	33.26″
Oct 3	0.13″	0.81″	1999	24%	33.39″
Oct 4	0.13″	2.04″	1971	16%	33.52″
Oct 5	0.12″	1.05″	2006	19%	33.64″
Oct 6	0.12″	3.50″	2005	19%	33.76″
Oct 7	0.12″	2.79″	2005	22%	33.88″
Oct 8	0.12″	1.17″	1996	29%	34.00″
Oct 9	0.12″	2.53″	1976	33%	34.12″
Oct 10	0.12″	3.38″	2013	19%	34.24″
Oct 11	0.12″	0.78″	1990	19%	34.36″
Oct 12	0.12″	1.92″	2011	25%	34.48″
Oct 13	0.13″	1.61″	1995	29%	34.61″
Oct 14	0.12″	1.30″	2014	21%	34.73″
Oct 15	0.11″	1.10″	2002	29%	34.84″
Oct 16	0.12″	1.11″	1975	25%	34.96″
Oct 17	0.11″	1.66″	1990	19%	35.06″
Oct 18	0.10″	2.09″	1996	29%	35.17″
Oct 19	0.12″	1.44″	2019	35%	35.28″
Oct 20	0.12″	2.45″	1995	22%	35.40″
Oct 21	0.11″	1.36″	1988	22%	35.51″
Oct 22	0.12″	2.63″	1990	19%	35.63″
Oct 23	0.12″	1.69″	2009	25%	35.76″
Oct 24	0.12″	3.39″	1971	30%	35.87″
Oct 25	0.13″	2.22″	1980	33%	36.00″
Oct 26	0.12″	1.89″	2003	32%	36.12″
Oct 27	0.12″	1.97″	2015	17%	36.24″
Oct 28	0.12″	1.61″	1972	29%	36.36″
Oct 29	0.12″	4.26″	2012	22%	36.48″
Oct 30	0.13″	1.35″	2019	24%	36.61″
Oct 31	0.12″	1.07″	1963	22%	36.73″
Nov 1	0.12″	1.32″	2018	35%	36.86″
Nov 2	0.12″	0.79″	1992	24%	36.97″
Nov 3	0.11″	1.95″	1970	19%	37.08″
Nov 4	0.11″	1.60″	2003	33%	37.20″
Nov 5	0.12″	2.42″	1963	27%	37.31″
Nov 6	0.11″	2.31″	1997	25%	37.42″
Nov 7	0.11″	1.58″	2006	24%	37.52″
Nov 8	0.11″	2.14″	1996	27%	37.64″
Nov 9	0.11″	2.08″	1990	35%	37.75″
Nov 10	0.11″	1.16″	1995	29%	37.85″
Nov 11	0.11″	1.21″	2020	40%	37.96″
Nov 12	0.10″	1.92″	2004	32%	38.06″
Nov 13	0.10″	1.59″	1995	21%	38.16″
Nov 14	0.10″	1.90″	1972	30%	38.26″
Nov 15	0.10″	1.75″	1989	29%	38.36″
Nov 16	0.10″	1.03″	1987	22%	38.47″
Nov 17	0.10″	0.95″	1980	21%	38.57″
Nov 18	0.11″	1.93″	2003	27%	38.67″
Nov 19	0.11″	1.33″	1972	30%	38.78″
Nov 20	0.10″	2.15″	2023	35%	38.88″
Nov 21	0.10″	1.54″	1991	22%	38.98″
Nov 22	0.10″	0.73″	1963	35%	39.07″
Nov 23	0.10″	1.81″	1971	27%	39.17″
Nov 24	0.10″	1.38″	1980	25%	39.27″
Nov 25	0.10″	1.72″	2013	40%	39.37″
Nov 26	0.10″	2.59″	1993	40%	39.47″
Nov 27	0.11″	2.23″	1993	29%	39.58″
Nov 28	0.11″	2.04″	1963	31%	39.70″
Nov 29	0.11″	1.15″	1967	30%	39.81″
Nov 30	0.11″	2.02″	1974	36%	39.92″
Dec 1	0.12″	1.42″	1986	31%	40.04″
Dec 2	0.12″	1.14″	1967	39%	40.16″
Dec 3	0.12″	1.18″	1993	22%	40.28″
Dec 4	0.12″	1.02″	2003	36%	40.40″
Dec 5	0.12″	0.97″	2013	29%	40.51″
Dec 6	0.12″	2.14″	2011	25%	40.63″
Dec 7	0.13″	1.13″	1976	30%	40.77″
Dec 8	0.13″	1.24″	1972	35%	40.89″
Dec 9	0.12″	1.50″	1969	38%	41.02″
Dec 10	0.13″	2.26″	1992	35%	41.14″
Dec 11	0.13″	1.51″	2024	27%	41.27″
Dec 12	0.12″	1.29″	1966	40%	41.39″
Dec 13	0.12″	1.47″	1996	36%	41.51″
Dec 14	0.12″	2.49″	2018	30%	41.62″
Dec 15	0.11″	0.99″	1974	29%	41.74″
Dec 16	0.11″	1.91″	2023	31%	41.85″
Dec 17	0.12″	2.92″	1977	33%	41.96″
Dec 18	0.11″	1.34″	2009	17%	42.07″
Dec 19	0.11″	0.66″	1973	33%	42.18″
Dec 20	0.11″	1.15″	1973	29%	42.28″
Dec 21	0.10″	2.14″	2022	37%	42.39″
Dec 22	0.09″	0.96″	1963	33%	42.48″
Dec 23	0.09″	2.01″	1986	33%	42.57″
Dec 24	0.08″	1.94″	2020	48%	42.65″
Dec 25	0.09″	1.00″	1969	23%	42.74″
Dec 26	0.09″	1.41″	2012	22%	42.82″
Dec 27	0.09″	1.74″	1967	30%	42.91″
Dec 28	0.09″	1.27″	2013	29%	43.01″
Dec 29	0.09″	0.87″	1969	30%	43.10″
Dec 30	0.09″	1.90″	1975	28%	43.19″
Dec 31	0.10″	0.76″	1972	44%	43.28″

Records & forecast → Sterling-Dulles Airport station Every Day of the Year → national almanac

Data: NOAA/NWS ThreadEx (RCC-ACIS) · normals 1991–2020 (or full record) · part of Weather Trader