Point Forecast: Chambersburg PA  39.93N 77.66W (Elev. 617 ft)	Last Update: 7:14 pm EDT May 12, 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: 9pm Mon, May 12 202510pm Mon, May 12 202511pm Mon, May 12 202512am Tue, May 13 20251am Tue, May 13 20252am Tue, May 13 20253am Tue, May 13 20254am Tue, May 13 20255am Tue, May 13 20256am Tue, May 13 20257am Tue, May 13 20258am Tue, May 13 20259am Tue, May 13 202510am Tue, May 13 202511am Tue, May 13 202512pm Tue, May 13 20251pm Tue, May 13 20252pm Tue, May 13 20253pm Tue, May 13 20254pm Tue, May 13 20255pm Tue, May 13 20256pm Tue, May 13 20257pm Tue, May 13 20258pm Tue, May 13 20259pm Tue, May 13 202510pm Tue, May 13 202511pm Tue, May 13 202512am Wed, May 14 20251am Wed, May 14 20252am Wed, May 14 20253am Wed, May 14 20254am Wed, May 14 20255am Wed, May 14 20256am Wed, May 14 20257am Wed, May 14 20258am Wed, May 14 20259am Wed, May 14 202510am Wed, May 14 202511am Wed, May 14 202512pm Wed, May 14 20251pm Wed, May 14 20252pm Wed, May 14 20253pm Wed, May 14 20254pm Wed, May 14 20255pm Wed, May 14 20256pm Wed, May 14 20257pm Wed, May 14 20258pm Wed, May 14 20259pm Wed, May 14 202510pm Wed, May 14 202511pm Wed, May 14 202512am Thu, May 15 20251am Thu, May 15 20252am Thu, May 15 20253am Thu, May 15 20254am Thu, May 15 20255am Thu, May 15 20256am Thu, May 15 20257am Thu, May 15 20258am Thu, May 15 20259am Thu, May 15 202510am Thu, May 15 202511am Thu, May 15 202512pm Thu, May 15 20251pm Thu, May 15 20252pm Thu, May 15 20253pm Thu, May 15 20254pm Thu, May 15 20255pm Thu, May 15 20256pm Thu, May 15 20257pm Thu, May 15 20258pm Thu, May 15 20259pm Thu, May 15 202510pm Thu, May 15 202511pm Thu, May 15 202512am Fri, May 16 20251am Fri, May 16 20252am Fri, May 16 20253am Fri, May 16 20254am Fri, May 16 20255am Fri, May 16 20256am Fri, May 16 20257am Fri, May 16 20258am Fri, May 16 20259am Fri, May 16 202510am Fri, May 16 202511am Fri, May 16 202512pm Fri, May 16 20251pm Fri, May 16 20252pm Fri, May 16 20253pm Fri, May 16 20254pm Fri, May 16 20255pm Fri, May 16 20256pm Fri, May 16 20257pm Fri, May 16 20258pm Fri, May 16 20259pm Fri, May 16 202510pm Fri, May 16 202511pm Fri, May 16 202512am Sat, May 17 20251am Sat, May 17 20252am Sat, May 17 20253am Sat, May 17 20254am Sat, May 17 20255am Sat, May 17 20256am Sat, May 17 20257am Sat, May 17 20258am Sat, May 17 2025

Date	05/12			05/13
Hour (EDT)	21	22	23	00	01	02	03	04	05	06	07	08	09	10	11	12	13	14	15	16	17	18	19	20
Temperature (°F)	71	68	66	66	65	65	64	64	63	63	62	64	64	65	65	66	66	66	67	68	67	67	67	66
Dewpoint (°F)	60	61	62	62	62	62	63	62	62	62	62	63	63	63	64	64	64	64	64	63	62	61	62	61
Heat Index (°F)
Surface Wind (mph)	2	2	2	2	2	2	2	2	3	3	5	5	6	6	7	8	9	9	10	10	10	10	9	8
Wind Dir	S	S	S	S	SE	SE	SE	SE	SE	SE	SE	SE	SE	SE	SE	SE	SE	SE	SE	SE	SE	SE	E	E
Gust																	20	21	21	22	22	23	23	22
Sky Cover (%)	93	91	93	91	96	94	96	99	100	100	100	100	100	100	100	100	100	100	100	100	100	100	100	100
Precipitation Potential (%)	26	30	44	60	79	69	77	89	94	93	91	90	95	93	94	89	85	98	98	98	98	98	98	99
Relative Humidity (%)	73	81	87	87	90	90	97	93	97	97	100	97	97	93	97	93	93	93	90	84	84	81	84	84
Rain	Chc	Chc	Chc	Lkly	Ocnl	Lkly	Ocnl	Ocnl	Ocnl	Ocnl	Ocnl	Ocnl	Ocnl	Ocnl	Ocnl	Ocnl	Ocnl	Ocnl	Ocnl	Ocnl	Ocnl	Ocnl	Ocnl	Ocnl
Thunder	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	--	SChc	SChc	SChc	SChc	SChc	SChc	Chc
Date				05/14
Hour (EDT)	21	22	23	00	01	02	03	04	05	06	07	08	09	10	11	12	13	14	15	16	17	18	19	20
Temperature (°F)	65	65	64	63	63	62	62	61	61	61	62	62	63	65	66	67	69	70	71	72	73	72	72	71
Dewpoint (°F)	62	62	62	62	61	60	60	61	61	61	61	61	62	62	63	64	64	65	65	64	64	64	65	65
Heat Index (°F)
Surface Wind (mph)	8	8	7	7	6	6	6	6	6	6	5	5	5	5	5	5	6	6	6	6	5	3	3	2
Wind Dir	SE	SE	E	E	E	E	E	E	E	E	E	E	E	E	E	E	E	E	E	E	E	E	E	E
Gust	22	22	22	21	20
Sky Cover (%)	100	100	100	100	100	100	100	100	100	98	97	95	95	95	95	97	98	100	100	100	100	97	95	92
Precipitation Potential (%)	99	99	99	99	99	88	88	88	88	88	88	75	75	75	75	75	75	95	95	95	95	95	95	73
Relative Humidity (%)	90	90	93	97	95	93	95	98	100	99	98	97	94	92	90	88	86	84	80	77	73	76	79	81
Rain	Ocnl	Ocnl	Ocnl	Ocnl	Ocnl	Ocnl	Ocnl	Ocnl	Ocnl	Ocnl	Ocnl	Ocnl	Ocnl	Ocnl	Ocnl	Ocnl	Ocnl	Ocnl	Ocnl	Ocnl	Ocnl	Ocnl	Ocnl	Lkly
Thunder	Chc	Chc	SChc	SChc	SChc	SChc	SChc	SChc	--	--	--	--	--	--	--	--	--	Chc	Chc	Chc	Chc	Chc	Chc	Chc

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