Point Forecast: Chambersburg PA  39.93N 77.66W (Elev. 617 ft)	Last Update: 11:19 pm EDT May 19, 2025

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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 Trans. Wind  ktmphkm/hm/s 20ft Wind  ktmphkm/hm/s Vent Rate (x1000 mph-ft) Davis Stability Index Atmospheric Dispersion Index Low Visibility Occurrence Risk Index Ceiling Height Visibility Thunder Potential

48-Hour Period Starting: 12am Tue, May 20 20251am Tue, May 20 20252am Tue, May 20 20253am Tue, May 20 20254am Tue, May 20 20255am Tue, May 20 20256am Tue, May 20 20257am Tue, May 20 20258am Tue, May 20 20259am Tue, May 20 202510am Tue, May 20 202511am Tue, May 20 202512pm Tue, May 20 20251pm Tue, May 20 20252pm Tue, May 20 20253pm Tue, May 20 20254pm Tue, May 20 20255pm Tue, May 20 20256pm Tue, May 20 20257pm Tue, May 20 20258pm Tue, May 20 20259pm Tue, May 20 202510pm Tue, May 20 202511pm Tue, May 20 202512am Wed, May 21 20251am Wed, May 21 20252am Wed, May 21 20253am Wed, May 21 20254am Wed, May 21 20255am Wed, May 21 20256am Wed, May 21 20257am Wed, May 21 20258am Wed, May 21 20259am Wed, May 21 202510am Wed, May 21 202511am Wed, May 21 202512pm Wed, May 21 20251pm Wed, May 21 20252pm Wed, May 21 20253pm Wed, May 21 20254pm Wed, May 21 20255pm Wed, May 21 20256pm Wed, May 21 20257pm Wed, May 21 20258pm Wed, May 21 20259pm Wed, May 21 202510pm Wed, May 21 202511pm Wed, May 21 202512am Thu, May 22 20251am Thu, May 22 20252am Thu, May 22 20253am Thu, May 22 20254am Thu, May 22 20255am Thu, May 22 20256am Thu, May 22 20257am Thu, May 22 20258am Thu, May 22 20259am Thu, May 22 202510am Thu, May 22 202511am Thu, May 22 202512pm Thu, May 22 20251pm Thu, May 22 20252pm Thu, May 22 20253pm Thu, May 22 20254pm Thu, May 22 20255pm Thu, May 22 20256pm Thu, May 22 20257pm Thu, May 22 20258pm Thu, May 22 20259pm Thu, May 22 202510pm Thu, May 22 202511pm Thu, May 22 202512am Fri, May 23 20251am Fri, May 23 20252am Fri, May 23 20253am Fri, May 23 20254am Fri, May 23 20255am Fri, May 23 20256am Fri, May 23 20257am Fri, May 23 20258am Fri, May 23 20259am Fri, May 23 202510am Fri, May 23 202511am Fri, May 23 202512pm Fri, May 23 20251pm Fri, May 23 20252pm Fri, May 23 20253pm Fri, May 23 20254pm Fri, May 23 20255pm Fri, May 23 20256pm Fri, May 23 20257pm Fri, May 23 20258pm Fri, May 23 20259pm Fri, May 23 202510pm Fri, May 23 202511pm Fri, May 23 202512am Sat, May 24 20251am Sat, May 24 20252am Sat, May 24 20253am Sat, May 24 20254am Sat, May 24 20255am Sat, May 24 20256am Sat, May 24 20257am Sat, May 24 20258am Sat, May 24 20259am Sat, May 24 202510am Sat, May 24 202511am Sat, May 24 2025

Date	05/20
Hour (EDT)	00	01	02	03	04	05	06	07	08	09	10	11	12	13	14	15	16	17	18	19	20	21	22	23
Temperature (°F)	56	53	50	48	47	45	46	48	49	53	56	60	62	64	66	67	67	68	67	66	65	63	61	59
Dewpoint (°F)	46	44	42	41	40	39	39	39	40	39	39	39	40	40	41	41	42	43	44	46	47	47	47	48
Heat Index (°F)
Surface Wind (mph)	2	2	2	2	2	1	2	2	3	3	3	3	3	3	3	3	3	2	3	3	3	3	2	2
Wind Dir	N	N	N	N	N	N	N	N	N	N	N	N	N	N	N	N	NE	NE	E	E	SE	SE	E	E
Gust
Sky Cover (%)	9	8	8	6	3	1	6	10	15	19	23	26	30	34	37	50	62	75	80	85	91	91	91	91
Precipitation Potential (%)	0	0	0	0	0	0	0	0	0	0	0	0	1	1	2	2	2	2	9	15	22	22	23	23
Relative Humidity (%)	69	71	74	77	76	79	76	71	71	59	53	46	44	41	40	39	40	40	43	48	52	56	60	67
Rain	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	SChc	SChc	SChc	SChc	SChc
Thunder	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--
Date	05/21
Hour (EDT)	00	01	02	03	04	05	06	07	08	09	10	11	12	13	14	15	16	17	18	19	20	21	22	23
Temperature (°F)	58	57	57	55	54	54	54	54	54	54	55	55	55	56	56	57	57	58	57	56	55	54	54	53
Dewpoint (°F)	48	48	48	48	49	49	50	50	52	52	53	53	53	54	54	54	53	53	53	53	53	53	53	53
Heat Index (°F)
Surface Wind (mph)	2	2	3	3	5	5	6	7	7	7	7	7	8	8	9	9	9	8	7	7	6	5	5	3
Wind Dir	E	E	E	SE	SE	SE	SE	SE	SE	SE	SE	SE	SE	SE	SE	SE	SE	SE	SE	SE	SE	SE	SE	SE
Gust														20	20	20	20
Sky Cover (%)	91	91	91	93	94	96	94	93	98	98	98	98	98	98	99	99	99	99	99	99	96	96	96	96
Precipitation Potential (%)	38	53	68	75	81	88	89	90	98	98	98	98	98	98	99	99	99	99	99	99	96	96	96	96
Relative Humidity (%)	69	72	72	77	83	83	86	86	93	93	93	93	93	93	93	90	86	83	86	90	93	95	98	100
Rain	Chc	Chc	Lkly	Ocnl	Ocnl	Ocnl	Ocnl	Ocnl	Ocnl	Ocnl	Ocnl	Ocnl	Ocnl	Ocnl	Ocnl	Ocnl	Ocnl	Ocnl	Ocnl	Ocnl	Ocnl	Ocnl	Ocnl	Ocnl
Thunder	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--

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