SWAN LAKE, MT - COOP Northwest station 248087

248087 - SWAN LAKE, Montana

Latitude
47° 56´N

Longitude
113° 50´W

Elevation
997 meters

10 nearest COOP Northwest stations

22 mi	S :	LINDBERGH LAKE, MT
24 mi	W :	BIGFORK 13 S, MT
31 mi	WSW :	POLSON, MT
31 mi	SSE :	SEELEY LAKE R S, MT
32 mi	WSW :	POLSON KERR DAM, MT
32 mi	W :	BIG ARM, MT
35 mi	WSW :	ROUND BUTTE 1 NNE, MT
37 mi	SW :	ST IGNATIUS, MT
40 mi	SSE :	OVANDO 7 WNW, MT
42 mi	WSW :	LONEPINE, MT

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

	Total observations	%	NDJFM observations	%
TMAX	10915	59.8%	4556	60.2%
TMIN	10898	59.7%	4550	60.2%
PRCP	11363	62.2%	4538	60.0%
SNOW	10983	60.1%	4467	59.1%

TMAX Help top of page

TMAX	observations	mean	std dev		Distribution	during extreme days of
NDJFM	4556 by year	36.5°F	11.0°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>=52°F	326	0.35	75	25	3.0*	map	table
Extreme low events Days with TMAX<=19°F	311	0.02	56	56	1.0	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>=52°F	326	0.62	94	18	5.2*	map	table
Extreme low events Days with TMAX<=19°F	311	-0.98	11	141	12.8*	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>=52°F	326	68	28	2.4*	map	table
Extreme low events Days with TMAX<=19°F	311	45	29	1.6	map	table

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TMIN Help top of page

TMIN	observations	mean	std dev		Distribution	during extreme days of
NDJFM	4550 by year	19.2°F	12.2°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<=-2°F	314	-0.06	51	62	1.2	map	table
Extreme high events Days with TMIN>=32°F	439	0.18	85	60	1.4	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<=-2°F	314	-0.82	13	121	9.3*	map	table
Extreme high events Days with TMIN>=32°F	439	0.29	84	28	3.0*	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<=-2°F	314	54	32	1.7*	map	table
Extreme high events Days with TMIN>=32°F	439	67	70	1.0	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	4538 by year	0.10"		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"	1877	0.24"	-0.04	297	326	1.1	map	table
Extreme events Days with PRCP>0.39"	367	0.66"	0.10	73	55	1.3	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"	1877	0.24"	-0.29	192	404	2.1*	map	table
Extreme events Days with PRCP>0.39"	367	0.66"	-0.25	41	70	1.7*	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"	1877	0.24"	308	366	1.2*	map	table
Extreme events Days with PRCP>0.39"	367	0.66"	53	71	1.3	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	4467 by year	0.89"		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"	1404	2.83"	-0.02	224	231	1.0	map	table
Extreme events Days with SNOW>4.5"	270	7.05"	-0.08	46	52	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"	1404	2.83"	-0.50	104	383	3.7*	map	table
Extreme events Days with SNOW>4.5"	270	7.05"	-0.63	16	79	4.9*	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"	1404	2.83"	230	215	1.1	map	table
Extreme events Days with SNOW>4.5"	270	7.05"	46	37	1.2	map	table

SNOW under 2 index extremes Help

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