Point Forecast: Jefferson MD  39.36N 77.52W (Elev. 689 ft)	Last Update: 7:34 pm EDT May 12, 2024

[hide menu]

Weather Elements Fire Weather Aviation Weather Temperature (°F) Dewpoint (°F) Heat Index (°F) Surface Wind  ktmphkm/hm/s Sky Cover (%) Precipitation Potential (%) Relative Humidity (%) Rain Thunder Fog Mixing Height  x100ftx100m Haines Index Lightning Activity Level Trans. Wind  ktmphkm/hm/s Vent Rate (x1000 mph-ft) Atmospheric Dispersion Index Low Visibility Occurrence Risk Index Ceiling Height Visibility

48-Hour Period Starting: 7pm Sun, May 12 20248pm Sun, May 12 20249pm Sun, May 12 202410pm Sun, May 12 202411pm Sun, May 12 202412am Mon, May 13 20241am Mon, May 13 20242am Mon, May 13 20243am Mon, May 13 20244am Mon, May 13 20245am Mon, May 13 20246am Mon, May 13 20247am Mon, May 13 20248am Mon, May 13 20249am Mon, May 13 202410am Mon, May 13 202411am Mon, May 13 202412pm Mon, May 13 20241pm Mon, May 13 20242pm Mon, May 13 20243pm Mon, May 13 20244pm Mon, May 13 20245pm Mon, May 13 20246pm Mon, May 13 20247pm Mon, May 13 20248pm Mon, May 13 20249pm Mon, May 13 202410pm Mon, May 13 202411pm Mon, May 13 202412am Tue, May 14 20241am Tue, May 14 20242am Tue, May 14 20243am Tue, May 14 20244am Tue, May 14 20245am Tue, May 14 20246am Tue, May 14 20247am Tue, May 14 20248am Tue, May 14 20249am Tue, May 14 202410am Tue, May 14 202411am Tue, May 14 202412pm Tue, May 14 20241pm Tue, May 14 20242pm Tue, May 14 20243pm Tue, May 14 20244pm Tue, May 14 20245pm Tue, May 14 20246pm Tue, May 14 20247pm Tue, May 14 20248pm Tue, May 14 20249pm Tue, May 14 202410pm Tue, May 14 202411pm Tue, May 14 202412am Wed, May 15 20241am Wed, May 15 20242am Wed, May 15 20243am Wed, May 15 20244am Wed, May 15 20245am Wed, May 15 20246am Wed, May 15 20247am Wed, May 15 20248am Wed, May 15 20249am Wed, May 15 202410am Wed, May 15 202411am Wed, May 15 202412pm Wed, May 15 20241pm Wed, May 15 20242pm Wed, May 15 20243pm Wed, May 15 20244pm Wed, May 15 20245pm Wed, May 15 20246pm Wed, May 15 20247pm Wed, May 15 20248pm Wed, May 15 20249pm Wed, May 15 202410pm Wed, May 15 202411pm Wed, May 15 202412am Thu, May 16 20241am Thu, May 16 20242am Thu, May 16 20243am Thu, May 16 20244am Thu, May 16 20245am Thu, May 16 20246am Thu, May 16 20247am Thu, May 16 20248am Thu, May 16 20249am Thu, May 16 202410am Thu, May 16 202411am Thu, May 16 202412pm Thu, May 16 20241pm Thu, May 16 20242pm Thu, May 16 20243pm Thu, May 16 20244pm Thu, May 16 20245pm Thu, May 16 20246pm Thu, May 16 20247pm Thu, May 16 20248pm Thu, May 16 20249pm Thu, May 16 202410pm Thu, May 16 202411pm Thu, May 16 202412am Fri, May 17 20241am Fri, May 17 20242am Fri, May 17 20243am Fri, May 17 20244am Fri, May 17 20245am Fri, May 17 20246am Fri, May 17 2024

Date	05/12					05/13
Hour (EDT)	19	20	21	22	23	00	01	02	03	04	05	06	07	08	09	10	11	12	13	14	15	16	17	18
Temperature (°F)	62	60	57	55	53	53	52	50	49	48	47	48	49	52	55	59	63	66	69	71	73	74	74	73
Dewpoint (°F)	44	45	47	48	48	47	47	46	45	45	45	45	47	48	50	51	51	51	52	52	51	51	52	51
Heat Index (°F)
Surface Wind (mph)	7	6	5	3	3	3	2	2	2	2	2	3	5	6	7	8	9	10	10	11	13	13	13	11
Wind Dir	NW	NW	N	N	NE	E	SE	S	S	S	S	S	S	S	S	S	S	S	S	S	S	S	S	S
Gust
Sky Cover (%)	69	50	31	28	25	26	26	27	27	27	26	24	23	21	16	11	5	9	12	16	17	18	19	23
Precipitation Potential (%)	5	4	3	2	1	1	1	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0
Relative Humidity (%)	52	58	69	77	83	80	83	86	86	89	93	89	93	86	83	75	65	58	55	51	46	44	46	46
Rain	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--
Thunder	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--
Date						05/14
Hour (EDT)	19	20	21	22	23	00	01	02	03	04	05	06	07	08	09	10	11	12	13	14	15	16	17	18
Temperature (°F)	71	68	66	64	62	60	59	58	57	57	57	58	59	61	62	63	64	64	65	65	65	66	66	66
Dewpoint (°F)	52	52	51	51	52	52	51	51	51	51	52	53	54	55	56	57	58	58	59	59	59	60	60	60
Heat Index (°F)
Surface Wind (mph)	11	10	10	10	10	10	9	9	9	8	8	8	9	10	11	13	14	15	15	15	15	14	14	14
Wind Dir	S	S	S	S	S	S	S	S	S	S	S	S	S	S	S	S	S	S	S	S	S	S	S	S
Gust																18	20	21	21	21	21	20	20	20
Sky Cover (%)	27	31	31	32	32	36	40	44	49	55	60	67	74	81	84	88	92	92	92	92	93	94	95	94
Precipitation Potential (%)	0	1	1	1	1	1	1	14	14	14	14	14	14	55	55	55	55	55	55	81	81	81	81	81
Relative Humidity (%)	51	57	58	63	70	75	75	77	80	80	83	83	83	81	81	81	81	81	81	81	81	81	81	81
Rain	--	--	--	--	--	--	--	--	--	--	--	--	--	Lkly	Lkly	Lkly	Lkly	Lkly	Lkly	Ocnl	Ocnl	Ocnl	Ocnl	Ocnl
Thunder	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	SChc	SChc	SChc	Chc	Chc

International System of Units Forecast Discussion 7-Day Forecast Hourly Weather Graph Hazardous Weather Briefing Page Past Weather Information Interactive Forecast Map Home