EAST HELENA, MT - COOP Northwest station 242634

242634 - EAST HELENA, Montana

Latitude
46° 35´N

Longitude
111° 55´W

Elevation
1189 meters

10 nearest COOP Northwest stations

2 mi	WNW :	HELENA AP ASOS, MT
6 mi	ENE :	CANYON FERRY DAM, MT
6 mi	ENE :	CANYON FERRY DAM, MT
7 mi	ENE :	CANYON FERRY, MT
15 mi	SE :	TOWNSEND, MT
16 mi	ENE :	WATSON 3 N, MT
21 mi	ESE :	TOWNSEND 12 ENE, MT
21 mi	W :	HELENA WATER TREATMENT, MT
22 mi	SE :	TOSTON 1 W, MT
22 mi	SE :	TOSTON 2 SW, MT

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

	Total observations	%	NDJFM observations	%
TMAX	3528	19.3%	1481	19.6%
TMIN	3529	19.3%	1481	19.6%
PRCP	3530	19.3%	1481	19.6%
SNOW	3521	19.3%	1473	19.5%

TMAX Help top of page

TMAX	observations	mean	std dev		Distribution	during extreme days of
NDJFM	1481 by year	34.4°F	16.3°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>=55°F	100	-0.09	8	14	1.8	map	table
Extreme low events Days with TMAX<=4°F	100	0.22	26	16	1.6	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>=55°F	100	0.48	23	3	7.7*	map	table
Extreme low events Days with TMAX<=4°F	100	-1.40	0	61	Inf*	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>=55°F	100	3	51	17.0*	map	table
Extreme low events Days with TMAX<=4°F	100	0	43	Inf*	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	1481 by year	13.8°F	16.0°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<=-16°F	104	0.28	31	15	2.1	map	table
Extreme high events Days with TMIN>=33°F	102	-0.23	7	16	2.3*	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<=-16°F	104	-1.52	0	71	Inf*	map	table
Extreme high events Days with TMIN>=33°F	102	0.47	25	8	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<=-16°F	104	0	46	Inf*	map	table
Extreme high events Days with TMIN>=33°F	102	3	54	18.0*	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	1481 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"	321	0.07"	-0.23	44	77	1.8*	map	table
Extreme events Days with PRCP>0.11"	60	0.22"	-0.03	13	13	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"	321	0.07"	-0.65	22	97	4.4*	map	table
Extreme events Days with PRCP>0.11"	60	0.22"	-0.54	4	18	4.5*	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"	321	0.07"	18	134	7.4*	map	table
Extreme events Days with PRCP>0.11"	60	0.22"	4	23	5.8*	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	1473 by year	0.27"		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"	267	1.47"	-0.15	45	64	1.4	map	table
Extreme events Days with SNOW>2.8"	49	4.42"	-0.09	10	11	1.1	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"	267	1.47"	-0.79	16	92	5.8*	map	table
Extreme events Days with SNOW>2.8"	49	4.42"	-0.72	1	16	16.0*	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"	267	1.47"	14	116	8.3*	map	table
Extreme events Days with SNOW>2.8"	49	4.42"	3	20	6.7*	map	table

SNOW under 2 index extremes Help

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