047643 - SAINT HELENA, California

Latitude
38° 30´N
Longitude
122° 28´W
Elevation
69 meters

COOP Southwest

California
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Main
10 nearest COOP Southwest stations
2 miW :SAINT HELENA 4 WSW, CA
3 miSE :OAKVILLE 1 WNW, CA
3 miNNE :ANGWIN PAC UNION COL, CA
3 miNE :SAINT HELENA 6 NE, CA
5 miNW :CALISTOGA, CA
5 miS :OAKVILLE 4 SW, CA
8 miSE :NAPA RIVER TELEMETERI, CA
8 miESE :ATLAS ROAD, CA
8 miENE :BERRYESSA LAKE, CA
8 miNW :KNIGHTS VALLEY, CA

Weather variables    Help
Click a weather variable name to jump down to those statistics.
Total
observations
%
NDJFM
observations
%
TMAX
16885
92.5%
7044
93.1%
TMIN
16888
92.5%
7044
93.1%
PRCP
16851
92.3%
7041
93.1%
SNOW
16688
91.4%
6931
91.6%




TMAX     Help     top of page

TMAX
observations
mean
std dev
   
Distribution
during extreme days of
NDJFM
7044  by year
61.3°F
8.3°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>=75°F
531
0.04
64
66
1.0
map
table
Extreme low events
Days with TMAX<=50°F
565
0.02
114
104
1.1
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>=75°F
531
0.37
109
37
2.9*
map
table
Extreme low events
Days with TMAX<=50°F
565
-0.70
59
221
3.7*
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>=75°F
531
57
78
1.4
map
table
Extreme low events
Days with TMAX<=50°F
565
98
129
1.3
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
7044  by year
38.5°F
7.2°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<=28°F
512
0.09
110
82
1.3
map
table
Extreme high events
Days with TMIN>=50°F
529
-0.24
55
111
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<=28°F
512
-0.86
37
206
5.6*
map
table
Extreme high events
Days with TMIN>=50°F
529
0.33
106
39
2.7*
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<=28°F
512
69
102
1.5*
map
table
Extreme high events
Days with TMIN>=50°F
529
86
100
1.2
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
7041  by year
0.20"
   
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"
2363
0.59"
-0.07
383
428
1.1
map
table
Extreme events
Days with PRCP>1.00"
465
1.84"
-0.17
70
104
1.5*
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"
2363
0.59"
-0.14
349
498
1.4*
map
table
Extreme events
Days with PRCP>1.00"
465
1.84"
-0.21
66
112
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"
2363
0.59"
490
415
1.2*
map
table
Extreme events
Days with PRCP>1.00"
465
1.84"
106
73
1.5*
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
6931  by year
0.00"
   
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"
7
1.84"
0.92
2
0
Inf
map
table
Extreme events
Days with SNOW>3.0"
1
4.00"
1.33
1
0
Inf
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"
7
1.84"
-1.12
0
3
Inf
map
table
Extreme events
Days with SNOW>3.0"
1
4.00"
-2.20
0
1
Inf
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"
7
1.84"
1
3
3.0
map
table
Extreme events
Days with SNOW>3.0"
1
4.00"
0
1
Inf
map
table

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