Weather archive on Mount Washington (AWS)

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Date / Local time		T	Po	P	Pa	U	DD	Ff	ff10	ff3	N	WW	W1	W2	Tn	Tx	Cl	Nh	H	Cm	Ch	VV	Td	RRR	tR	E	Tg	E'	sss
2026 May 18, Monday	17	11.9 53	610.7 24.04 814.2 814.2		-0.1 -0 -0.13 -0.13	76	Wind blowing from the west	Gale (19 m/s) (68 km/h) (43 mph) (37 knots) (8 Bft)			90 or more, but not 100% 9/10 or more, but not 10/10 7 oktas or more, but not 8 oktas	State of sky on the whole unchanged.	Fog or ice fog or thick haze.	Cloud covering more than 1/2 of the sky throughout the appropriate period.			No Stratocumulus, Stratus, Cumulus or Cumulonimbus.	50%. 5/10. 4 oktas	600-1000 1968-3281	Patches (often lenticular) of Altocumulus translucidus, continually changing and occurring at one or more levels.	Cirrus fibratus, sometimes uncinus, not progressively invading the sky.	71.0 44.1	7.8 46
	14	8.1 47	610.8 24.05 814.33 814.33		-0.2 -0.01 -0.27 -0.27	95	Wind blowing from the west	Gale (19 m/s) (68 km/h) (43 mph) (37 knots) (8 Bft)			100%. 10/10. 8 oktas	Fog or ice fog, sky visible, has begun or has become thicker during the preceding hour.	Shower(s).	Fog or ice fog or thick haze.	3.9 39	8.6 47	Stratus nebulosus or Stratus fractus other than of bad weather, or both.	100%. 10/10. 8 oktas	Less than 50 Less than 50			0.2 0.1	7.4 45	2.0 0.08	6
	11	8.3 47	611.0 24.06 814.6 814.6		-0.3 -0.01 -0.4 -0.4	76	Wind blowing from the south-west	Strong breeze (13 m/s) (47 km/h) (29 miles/hour) (25 knots) (6 Bft)			100%. 10/10. 8 oktas	Precipitation within sight, reaching the ground or the surface of the sea, but distant, i.e. estimated to be more than 5 km from the station.	Shower(s).	Fog or ice fog or thick haze.			Stratocumulus cumulogenitus.	90 or more, but not 100% 9/10 or more, but not 10/10 7 oktas or more, but not 8 oktas		Altostratus opacus or Nimbostratus.		71.0 44.1	4.2 40
	08	7.7 46	611.3 24.07 815 815		0.7 0.03 0.93 0.93	72	Wind blowing from the west	Fresh breeze (9 m/s) (32 km/h) (20 miles/hour) (17 knots) (5 Bft)			100%. 10/10. 8 oktas	Precipitation within sight, reaching the ground or the surface of the sea, but distant, i.e. estimated to be more than 5 km from the station.	Cloud covering more than 1/2 of the sky throughout the appropriate period.	Cloud covering more than 1/2 of the sky throughout the appropriate period.	3.9 39	9.5 49	Cumulus and Stratocumulus other than Stratocumulus cumulogenitus, with bases at different levels.	70 – 80%. 7/10 – 8/10. 6 oktas	300-600 984-1968	Altostratus opacus or Nimbostratus.	Cirrostratus covering the whole sky.	71.0 44.1	2.9 37
	05	6.7 44	610.6 24.04 814.07 814.07		0.7 0.03 0.93 0.93	82	Wind blowing from the west-northwest	Near gale (17 m/s) (61 km/h) (38 miles/hour) (33 knots) (7 Bft)			90 or more, but not 100% 9/10 or more, but not 10/10 7 oktas or more, but not 8 oktas	Precipitation within sight, not reaching the ground or the surface of the sea.	Cloud covering more than 1/2 of the sky throughout the appropriate period.	Cloud covering more than 1/2 of the sky throughout the appropriate period.			Stratocumulus other than Stratocumulus cumulogenitus.	20–30%. 2/10–3/10. 2 oktas	300-600 984-1968	Altocumulus translucidus or opacus in two or more layers, or Altocumulus opacus in a single layer, not progressively invading the sky, or Altocumulus with Altostratus or Nimbostratus.	Cirrus (often in bands) and Cirrostratus, or Cirrostratus alone, progressively invading the sky; they generally thicken as a whole; the continuous veil extends more than 45 degrees above the horizon, without the sky being totally covered.	71.0 44.1	3.8 39
	02	5.3 42	609.9 24.01 813.13 813.13			72	Wind blowing from the north-west	Strong gale (21 m/s) (76 km/h) (47 miles/hour) (41 mile/hour) (9 Bft)			70 – 80%. 7/10 – 8/10. 6 oktas				3.9 39	9.5 49	No Stratocumulus, Stratus, Cumulus or Cumulonimbus.	20–30%. 2/10–3/10. 2 oktas	2500 or more, or no clouds. 8202 or more, or no clouds.	Altostratus opacus or Nimbostratus.	Cirrus (often in bands) and Cirrostratus, or Cirrostratus alone, progressively invading the sky; they generally thicken as a whole; the continuous veil extends more than 45 degrees above the horizon, without the sky being totally covered.	71.0 44.1	0.6 33
May 17, Sunday	23	4.1 39	609.0 23.98 811.93 811.93		1.1 0.04 1.47 1.47	80	Wind blowing from the north-west	Strong gale (24 m/s) (86 km/h) (54 mph) (47 knots) (9 Bft)			90 or more, but not 100% 9/10 or more, but not 10/10 7 oktas or more, but not 8 oktas						No Stratocumulus, Stratus, Cumulus or Cumulonimbus.	50%. 5/10. 4 oktas	2000-2500 6562-8202	Altostratus opacus or Nimbostratus.	Cirrus (often in bands) and Cirrostratus, or Cirrostratus alone, progressively invading the sky; they generally thicken as a whole; the continuous veil extends more than 45 degrees above the horizon, without the sky being totally covered.	71.0 44.1	1.0 34
	20	6.1 43	607.9 23.93 810.47 810.47		0.3 0.01 0.4 0.4	73	Wind blowing from the west-northwest	Strong gale (23 m/s) (83 km/h) (51 mile/hour) (45 knots) (9 Bft)			70 – 80%. 7/10 – 8/10. 6 oktas				4.4 40	9.5 49	Cumulus humilis or Cumulus fractus other than of bad weather, or both.	10% or less, but not 0 1/10 or less, but not zero 1 okta or less, but not 0	300-600 984-1968	Altostratus opacus or Nimbostratus.	Cirrus (often in bands) and Cirrostratus, or Cirrostratus alone, progressively invading the sky; they generally thicken as a whole; the continuous veil extends more than 45 degrees above the horizon, without the sky being totally covered.	65.0 40.4	1.6 35
	17	9.0 48	607.6 23.92 810.07 810.07			66	Wind blowing from the west-northwest	Strong gale (22 m/s) (79 km/h) (49 miles/hour) (43 knots) (9 Bft)			70 – 80%. 7/10 – 8/10. 6 oktas						Stratocumulus cumulogenitus.	70 – 80%. 7/10 – 8/10. 6 oktas	600-1000 1968-3281	No Altocumulus, Altostratus or Nimbostratus.	No Cirrus, Cirrocumulus or Cirrostratus.	71.0 44.1	3.0 37