HELENA AP ASOS, MT - COOP Northwest station 244055

244055 - HELENA AP ASOS, Montana

Latitude
46° 36´N

Longitude
111° 58´W

Elevation
1167 meters

10 nearest COOP Northwest stations

2 mi	ESE :	EAST HELENA, MT
7 mi	ENE :	CANYON FERRY DAM, MT
7 mi	ENE :	CANYON FERRY DAM, MT
8 mi	E :	CANYON FERRY, MT
17 mi	SE :	TOWNSEND, MT
17 mi	ENE :	WATSON 3 N, MT
20 mi	W :	HELENA WATER TREATMENT, MT
21 mi	W :	HELENA, MT
22 mi	W :	HELENA 6 N, MT
22 mi	ESE :	TOWNSEND 12 ENE, MT

Weather variables Help
Click a weather variable name to jump down to those statistics.

	Total observations	%	NDJFM observations	%
TMAX	18253	99.9%	7555	99.9%
TMIN	18148	99.4%	7495	99.1%
PRCP	18033	98.7%	7449	98.5%
SNOW	17551	96.1%	7286	96.3%

TMAX Help top of page

TMAX	observations	mean	std dev		Distribution	during extreme days of
NDJFM	7555 by year	36.7°F	15.3°F		overall	NAM	PNA	CTI

TMAX and NAM Help scatterplot	days by month	mean NAM index	extreme high NAM days	extreme low NAM days	ratio of extreme high:low NAM days
Extreme high events Days with TMAX>=56°F	583	0.32	124	50	2.5*	map	table
Extreme low events Days with TMAX<=10°F	542	-0.14	109	138	1.3	map	table

TMAX and PNA Help scatterplot	days by month	mean PNA index	extreme high PNA days	extreme low PNA days	ratio of extreme high:low PNA days
Extreme high events Days with TMAX>=56°F	583	0.49	153	37	4.1*	map	table
Extreme low events Days with TMAX<=10°F	542	-1.12	11	245	22.3*	map	table

TMAX and CTI Help	days by month	high CTI days (moderate to strong El Niño winters)	low CTI days (moderate to strong La Niña winters)	ratio of high:low CTI (El Niño:La Niña days)
Extreme high events Days with TMAX>=56°F	583	104	81	1.3	map	table
Extreme low events Days with TMAX<=10°F	542	47	103	2.2*	map	table

TMAX under 2 index extremes Help

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TMIN Help top of page

TMIN	observations	mean	std dev		Distribution	during extreme days of
NDJFM	7495 by year	15.7°F	14.7°F		overall	NAM	PNA	CTI

TMIN and NAM Help scatterplot	days by month	mean NAM index	extreme high NAM days	extreme low NAM days	ratio of extreme high:low NAM days
Extreme low events Days with TMIN<=-10°F	542	-0.17	104	131	1.3	map	table
Extreme high events Days with TMIN>=33°F	572	0.21	104	63	1.7*	map	table

TMIN and PNA Help scatterplot	days by month	mean PNA index	extreme high PNA days	extreme low PNA days	ratio of extreme high:low PNA days
Extreme low events Days with TMIN<=-10°F	542	-1.04	16	243	15.2*	map	table
Extreme high events Days with TMIN>=33°F	572	0.38	126	41	3.1*	map	table

TMIN and CTI Help	days by month	high CTI days (moderate to strong El Niño winters)	low CTI days (moderate to strong La Niña winters)	ratio of high:low CTI (El Niño:La Niña days)
Extreme low events Days with TMIN<=-10°F	542	53	109	2.1*	map	table
Extreme high events Days with TMIN>=33°F	572	67	93	1.4*	map	table

TMIN under 2 index extremes Help

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PRCP (total liquid water equivalent) Help top of page

PRCP	observations	mean		Distribution	during extreme days of
NDJFM	7449 by year	0.02"		overall	NAM	PNA	CTI

PRCP and NAM Help scatterplot	days by month	mean	mean NAM index	extreme high NAM days	extreme low NAM days	ratio of extreme high:low NAM days
Observed events Days with PRCP>0.00"	1848	0.07"	-0.03	317	342	1.1	map	table
Extreme events Days with PRCP>0.12"	337	0.23"	-0.01	65	68	1.0	map	table

PRCP and PNA Help scatterplot	days by month	mean	mean PNA index	extreme high PNA days	extreme low PNA days	ratio of extreme high:low PNA days
Observed events Days with PRCP>0.00"	1848	0.07"	-0.44	166	480	2.9*	map	table
Extreme events Days with PRCP>0.12"	337	0.23"	-0.55	27	95	3.5*	map	table

PRCP and CTI Help	days by month	mean	high CTI days (moderate to strong El Niño winters)	low CTI days (moderate to strong La Niña winters)	ratio of high:low CTI (El Niño:La Niña days)
Observed events Days with PRCP>0.00"	1848	0.07"	245	336	1.4*	map	table
Extreme events Days with PRCP>0.12"	337	0.23"	46	64	1.4	map	table

PRCP under 2 index extremes Help

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SNOW Help top of page

SNOW	observations	mean		Distribution	during extreme days of
NDJFM	7286 by year	0.24"		overall	NAM	PNA	CTI

SNOW and NAM Help scatterplot	days by month	mean	mean NAM index	extreme high NAM days	extreme low NAM days	ratio of extreme high:low NAM days
Observed events Days with SNOW>0.0"	1560	1.14"	-0.06	267	302	1.1	map	table
Extreme events Days with SNOW>1.8"	302	3.65"	-0.06	58	60	1.0	map	table

SNOW and PNA Help scatterplot	days by month	mean	mean PNA index	extreme high PNA days	extreme low PNA days	ratio of extreme high:low PNA days
Observed events Days with SNOW>0.0"	1560	1.14"	-0.61	97	477	4.9*	map	table
Extreme events Days with SNOW>1.8"	302	3.65"	-0.74	12	95	7.9*	map	table

SNOW and CTI Help	days by month	mean	high CTI days (moderate to strong El Niño winters)	low CTI days (moderate to strong La Niña winters)	ratio of high:low CTI (El Niño:La Niña days)
Observed events Days with SNOW>0.0"	1560	1.14"	210	297	1.4*	map	table
Extreme events Days with SNOW>1.8"	302	3.65"	38	57	1.5	map	table

SNOW under 2 index extremes Help

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