HELENA WSO, MT - HCND station 244055

244055 - HELENA WSO, Montana

Latitude
46° 37´N

Longitude
112° 0´W

Elevation
3828 feet

10 nearest HCND stations

44 mi	NNE :	CASCADE 5S, MT
63 mi	NNW :	AUGUSTA, MT
79 mi	SSE :	NORRIS MADISON POWER HOUSE, MT
79 mi	SE :	BOZEMAN MONTANA ST UNIV, MT
84 mi	N :	CHOTEAU AP, MT
87 mi	S :	ENNIS, MT
90 mi	S :	VIRGINIA CITY, MT
101 mi	SSW :	DILLON WMCE, MT
101 mi	ENE :	MOCCASIN EXPERIMENT STATION, MT
106 mi	WSW :	HAMILTON, MT

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

	Total observations	%	NDJFM observations	%
TMAX	18258	100.0%	7559	99.9%
TMIN	18253	99.9%	7554	99.9%
PRCP	14373	78.7%	5503	72.8%
SNOW	15377	84.2%	5650	74.7%

TMAX Help top of page

TMAX	observations	mean	std dev		Distribution	during extreme days of
NDJFM	7559 by year	36.6°F	15.4°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	549	-0.12	113	138	1.2	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	549	-1.14	11	252	22.9*	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	549	47	103	2.2*	map	table

TMAX under 2 index extremes Help

Maps - choose one extreme:

TMIN Help top of page

TMIN	observations	mean	std dev		Distribution	during extreme days of
NDJFM	7554 by year	15.5°F	14.8°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<=-11°F	530	-0.04	117	116	1.0	map	table
Extreme high events Days with TMIN>=33°F	574	0.21	105	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<=-11°F	530	-1.11	14	255	18.2*	map	table
Extreme high events Days with TMIN>=33°F	574	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<=-11°F	530	45	107	2.4*	map	table
Extreme high events Days with TMIN>=33°F	574	69	93	1.3	map	table

TMIN under 2 index extremes Help

Maps - choose one extreme:

PRCP (total liquid water equivalent) Help top of page

PRCP	observations	mean		Distribution	during extreme days of
NDJFM	5503 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"	1868	0.07"	-0.02	323	342	1.1	map	table
Extreme events Days with PRCP>0.11"	373	0.22"	-0.01	69	72	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"	1868	0.07"	-0.45	166	484	2.9*	map	table
Extreme events Days with PRCP>0.11"	373	0.22"	-0.55	29	103	3.6*	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"	1868	0.07"	258	336	1.3*	map	table
Extreme events Days with PRCP>0.11"	373	0.22"	53	67	1.3	map	table

PRCP under 2 index extremes Help

Maps - choose one extreme:

SNOW Help top of page

SNOW	observations	mean		Distribution	during extreme days of
NDJFM	5650 by year	0.31"		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"	1554	1.14"	-0.05	268	299	1.1	map	table
Extreme events Days with SNOW>1.8"	301	3.64"	-0.05	58	59	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"	1554	1.14"	-0.61	97	473	4.9*	map	table
Extreme events Days with SNOW>1.8"	301	3.64"	-0.73	12	94	7.8*	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"	1554	1.14"	209	294	1.4*	map	table
Extreme events Days with SNOW>1.8"	301	3.64"	37	57	1.5	map	table

SNOW under 2 index extremes Help

Maps - choose one extreme: