244241 - HOLTER DAM, Montana

Latitude
46° 59´N
Longitude
112° 1´W
Elevation
1063 meters

COOP Northwest

Montana
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Main
10 nearest COOP Northwest stations
10 miSW :CANYON CREEK, MT
13 miSW :MARYSVILLE 1 SW, MT
13 miSW :MARYSVILLE 3, MT
13 miS :HELENA 6 N, MT
15 miS :HELENA WATER TREATMENT, MT
16 miSSW :AUSTIN 1 W, MT
17 miS :HELENA, MT
18 miS :UNIONVILLE, MT
18 miW :LINCOLN RANGER STN, MT
18 miSSW :RIMINI 4 NE, MT

Weather variables    Help
Click a weather variable name to jump down to those statistics.
Total
observations
%
NDJFM
observations
%
TMAX
18002
98.6%
7457
98.6%
TMIN
17990
98.5%
7456
98.6%
PRCP
18045
98.8%
7467
98.7%
SNOW
13797
75.5%
5173
68.4%




TMAX     Help     top of page

TMAX
observations
mean
std dev
   
Distribution
during extreme days of
NDJFM
7457  by year
40.5°F
13.9°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>=57°F
611
0.35
129
43
3.0*
map
table
Extreme low events
Days with TMAX<=15°F
515
-0.23
94
140
1.5*
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>=57°F
611
0.51
153
30
5.1*
map
table
Extreme low events
Days with TMAX<=15°F
515
-1.10
15
229
15.3*
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>=57°F
611
89
96
1.1
map
table
Extreme low events
Days with TMAX<=15°F
515
55
99
1.8*
map
table

TMAX under 2 index extremes     Help
Station table Maps - choose one extreme:
High NAMLow NAM High PNALow PNA High CTILow CTI




TMIN     Help     top of page

TMIN
observations
mean
std dev
   
Distribution
during extreme days of
NDJFM
7456  by year
23.8°F
15.2°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<=-5°F
498
-0.32
81
139
1.7*
map
table
Extreme high events
Days with TMIN>=41°F
623
0.26
114
56
2.0*
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<=-5°F
498
-1.13
10
231
23.1*
map
table
Extreme high events
Days with TMIN>=41°F
623
0.50
152
26
5.8*
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<=-5°F
498
53
97
1.8*
map
table
Extreme high events
Days with TMIN>=41°F
623
97
102
1.1
map
table

TMIN under 2 index extremes     Help
Station table Maps - choose one extreme:
High NAMLow NAM High PNALow PNA High CTILow CTI




PRCP (total liquid water equivalent)     Help     top of page

PRCP
observations
mean
   
Distribution
during extreme days of
NDJFM
7467  by year
0.01"
   
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"
1475
0.07"
-0.06
245
276
1.1
map
table
Extreme events
Days with PRCP>0.11"
272
0.21"
0.01
46
52
1.1
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"
1475
0.07"
-0.52
117
392
3.4*
map
table
Extreme events
Days with PRCP>0.11"
272
0.21"
-0.48
25
51
2.0*
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"
1475
0.07"
205
258
1.3*
map
table
Extreme events
Days with PRCP>0.11"
272
0.21"
40
51
1.3
map
table

PRCP under 2 index extremes     Help
Station table Maps - choose one extreme:
High NAMLow NAM High PNALow PNA High CTILow CTI




SNOW     Help     top of page

SNOW
observations
mean
   
Distribution
during extreme days of
NDJFM
5173  by year
0.17"
   
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"
602
1.49"
-0.03
108
114
1.1
map
table
Extreme events
Days with SNOW>2.0"
113
4.08"
0.07
24
19
1.3
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"
602
1.49"
-0.71
35
191
5.5*
map
table
Extreme events
Days with SNOW>2.0"
113
4.08"
-0.54
11
27
2.5*
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"
602
1.49"
77
101
1.3
map
table
Extreme events
Days with SNOW>2.0"
113
4.08"
16
20
1.2
map
table

SNOW under 2 index extremes     Help
Station table Maps - choose one extreme:
High NAMLow NAM High PNALow PNA High CTILow CTI