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Comparative Climate
 
Idaho
click here to view a precipitation map of idaho
  Pan Evaporation
 

Standard daily pan evaporation is measured using the four-foot diameter Class A evaporation pan. The pan water level reading is adjusted when precipitation is measure to obtain the actual evaporation. Most Class A pans are installed aboveground, allowing effects such as radiation on the side walls and heat exchnges with the pan material. These effects tend to increase the evaporation totals. The amounts can then be adjusted by multiplying the totals b 0.70 or 0.80 to more closely estimate the evaporation from naturally existing urfaces such as a shallow lake, wet soil or other moist natural surfaces.

Many stations do not measure pan evaportation during winter months. A "0.00" total indicates no measuement is taken.

Stations marked with an asterisk * have estimated totals computed from meteorological measurements using a form of the Penman equation.

 
 
 
period of record
jan
feb
mar
apr
may
jun
july
aug
sept
oct
nov
dec
year
Aberdeen Exp Stn
1914-2002
M
M
M
M
7.50
8.95
10.31
9.42
6.43
3.85
M
M
46.46
Arrowrock Dam
1916-2002
M
M
M
M
5.94
7.53
10.18
8.93
5.75
2.35
M
M
40.68
Boise Airport *
 
1.60
1.60
3.60
5.10
7.40
9.20
12.10
10.00
6.60
3.90
1.80
1.10
64.00
Emmett 2 E
1948-2002
M
M
M
5.62
7.16
8.81
10.60
9.45
6.61
4.57
M
M
52.82
Kuna 3 E
1978-1982
M
M
M
M
6.32
6.95
8.21
6.91
4.96
M
M
M
33.35
Lifton Pumping Stn
1935-2002
M
M
M
4.08
5.97
7.42
8.73
7.82
5.35
3.02
M
M
42.39
Mackay 4 NW
1965-1988
M
M
M
M
6.81
8.39
10.23
8.73
6.39
M
M
M
40.55
Moscow Uuiv of Idaho
1893-2002
M
M
3.03
3.83
5.67
6.52
8.61
8.24
5.32
3.03
2.85
M
47.10
Parma Exp Stn
1922-2002
M
M
M
6.00
8.35
9.04
10.41
9.50
6.32
M
M
M
49.62
Pocatello Airport *
 
1.00
1.40
3.50
4.90
7.40
8.90
11.70
9.20
6.40
4.00
1.80
1.00
61.10
Rexburg Ricks College
1977-2002
M
M
M
M
6.59
7.29
8.06
7.85
5.81
M
M
M
35.60
Sandpoint Exp Stn
1910-2002
M
M
M
M
5.17
5.51
7.42
6.91
4.58
M
M
M
29.59
Twin Falls WSO
1963-2002
M
M
M
5.82
8.12
9.13
10.25
9.11
6.65
4.31
0.77
M
54.16
 
  State Extremes
  * Also at earlier dates at the same time or other places
 
 
date or year
location
value
Record Highest Temp
28-Jul-34
Orofino
118.00
Record Lowest Temp
18-Jan-43
Island Park Dam
-60.00
Highest Average Annual Temp
Swan Falls PH
55.30
Lowest Average Annual Temp
Obsidian 2 NNW
34.30
Consecutive Days Max >= 70
Jun-Sep 1967
Slate Creek R.S.
77 days
Consecutive Days Min <= 32
Aug 66-May 67
Galena
267 days
 
   
Record Maximum Annual Precip
1933
Roland
81.05
Record Minimum Annual Precip
1947
Grand View
2.09
Record Maximum 24-hour Precip
23-Nov-09
Rattlesnake Creek
7.17
Highest Average Annual Precip
Burke 2 ENE
48.87
Lowest Average Annual Precip
Grand View 2 W
6.96
Consecutive Days Measurable Precip
Nov-Dec 1998
Fenn R.S.
36 days
Consecutive Days with no Measurable Precip
Jun-Nov 1999
Bruneau
165 days
 
   
Record Maximum Winter Snowfall
1949-50
Roland West Portal
441.80
Record Maximum 1-Day Snowfall
11-Feb-59
Sun Valley
38.00
Highest Average Annual Snowfall
Mullan Pass
283.50
 
  Precipitation
(mean monthly & annual number of hrs with measurable precip with % of hrs and maximum 1-hr totals)
 

* = Less than 1/2 hour

Maximum 1-hour totals are based on data from top of the hour. Maximum 60-minute totals will be greater.
 
 
period of record
jan
feb
mar
apr
may
jun
july
aug
sept
oct
nov
dec
year
hour
inches
Boise
1948-1999
58
41
40
33
31
21
6
7
13
22
48
51
371
4
1.10
Lewiston
1954-1999
49
36
38
39
41
33
15
15
21
29
44
45
405
5
1.04
Pocatello
1948-1999
61
48
59
59
47
42
53
42
38
57
71
69
370
4
0.78
 
  Sunshine Days
(mean monthly & annual % of possible sunshine)
 

Only the first order stations record possible sunshine.

For more information click here on Western States, Alaska or Hawaii and Pacific Island
 
jan
feb
mar
apr
may
jun
july
aug
sept
oct
nov
dec
annual
Boise
40
51
62
68
70
75
87
85
82
69
43
38
64
Pocatello
40
53
61
66
67
75
83
81
80
71
46
40
64