National Weather Service United States Department of Commerce

Winter Storm For Carolinas

A cold arctic air mass is gripping much of the Eastern two-thirds of the U.S. today. This frigid air mass will set the stage for a wintry mess of snow, sleet and freezing rain across parts of the Carolinas and Delmarva Peninsula through Saturday morning. The frozen precipitation may result in dangerous travel conditions and scattered power outages. Read More >

Southwest Idaho and Southeast Oregon Freeze Probability Data
 
The tables list the probability of a given temperature or lower will be reached by a date. Probabilities are based on observed temperatures from 1981 through 2010. For example, Boise has a 90% chance of getting spring temperatures of 36 F on and after May 10.
 
A hard freeze is when temperatures reach or fall below 28 F.
A freeze is when temperatures reach or fall below 32 F.
 
SPRING
FALL

Boise

% Probability of Indicated Temperature or Lower on or After Date

 
90%
75%
50%
25%
10%
36 F
May 2
May 11
May 16
June 5
June 11
32 F
April 17
May 2
May 8
May 14
May 25
28 F
March 28
April 9
April 16
May 5
May 12
24 F
Feb. 17
March 2
March 12
April 9
April 21
 

Nampa

% Probability of Indicated Temperature or Lower on or After Date

 
90%
75%
50%
25%
10%
36 F
May 9
May 13
May 22
May 30
June 9
32 F
April 16
April 22
May 3
May 10
May 19
28 F
March 24
April 3
April 12
April 22
May 1
24 F
March 3
March 5
March 17
April 3
April 15
 

Emmett

% Probability of Indicated Temperature or Lower on or After Date

 
90%
75%
50%
25%
10%
36 F
May 2
May 8
May 17
May 30
June 8
32 F
April 18
April 28
May 5
May 13
May 20
28 F
March 20
March 31
April 14
April 25
May 5
24 F
March 1
March 5
March 19
April 9
April 15
 

Payette

% Probability of Indicated Temperature or Lower on or After Date

 
90%
75%
50%
25%
10%
36 F
May 1
May 5
May 12
May 24
June 3
32 F
April 16
April 19
May 2
May 12
May 14
28 F
March 24
April 5
April 12
April 23
May 6
24 F
March 3
March 10
March 28
April 11
April 17
 

Parma

% Probability of Indicated Temperature or Lower on or After Date

 
90%
75%
50%
25%
10%
36 F
May 3
May 10
May 16
May 31
June 8
32 F
April 16
April 24
May 2
May 12
May 15
28 F
March 28
April 7
April 14
April 20
May 3
24 F
March 3
March 19
March 28
April 9
April 11
 

Nyssa

% Probability of Indicated Temperature or Lower on or After Date

 
90%
75%
50%
25%
10%
36 F
April 21
May 4
May 9
May 19
June 12
32 F
April 1
April 13
April 22
May 2
May 11
28 F
March 14
March 26
April 7
April 15
April 25
24 F
Feb. 17
March 2
March 16
April 7
April 10
 

Vale, Oregon

% Probability of Indicated Temperature or Lower on or After Date

 
90%
75%
50%
25%
10%
36 F
May 5
May 19
June 1
June 14
Jul 2
32 F
April 29
May 6
May 10
May 20
May 20
28 F
April 10
April 15
April 24
May 6
May 18
24 F
March 13
March 30
April 12
April 18
May 5
 

Grand View

% Probability of Indicated Temperature or Lower on or After Date

 
90%
75%
50%
25%
10%
36 F
May 1
May 7
May 16
May 25
June 6
32 F
April 17
April 27
May 5
May 12
May 16
28 F
April 6
April 9
April 15
April 27
May 7
24 F
March 3
March 24
March 31
April 12
April 17
 

Glenns Ferry

% Probability of Indicated Temperature or Lower on or After Date

 
90%
75%
50%
25%
10%
36 F
May 13
May 22
May 31
June 13
June 20
32 F
April 30
May 4
May 13
May 21
May 24
28 F
April 14
April 23
May 3
May 13
May 20
24 F
March 30
April 10
April 17
April 30
May 7
 

Twin Falls

% Probability of Indicated Temperature or Lower on or After Date

 
90%
75%
50%
25%
10%
36 F
May 19
May 24
June 5
June 12
June 19
32 F
April 30
May 6
May 10
May 19
May 25
28 F
April 15
April 26
May 1
May 7
May 13
24 F
March 18
March 30
April 11
April 27
May 3

Boise

% Probability of Temperature or Lower on or Before Date

 
10%
25%
50%
75%
90%
36 F
Sept. 10
Sept. 20
Sept. 25
Oct. 3
Oct. 10
32 F
Sept. 21
Sept. 30
Oct. 11
Oct. 20
Oct. 25
30 F
Oct. 6
Oct. 16
Oct. 25
Nov. 1
Nov. 8
28 F
Oct. 15
Oct. 29
Nov. 4
Nov. 19
Nov. 26
 

Nampa

% Probability of Temperature or Lower on or Before Date

 
10%
25%
50%
75%
90%
36 F
Sept. 10
Sept. 17
Sept.24
Oct. 6
Oct. 10
32 F
Sept. 25
Oct. 6
Oct. 11
Oct. 20
Oct. 25
28 F
Oct. 10
Oct. 13
Oct. 24
Oct. 30
Nov. 6
24 F
Oct. 18
Oct. 30
Nov. 8
Nov. 14
Nov. 21
 

Emmett

% Probability of Temperature or Lower on or Before Date

 
10%
25%
50%
75%
90%
36 F
Sept. 13
Sept. 21
Oct. 1
Oct. 7
Oct. 10
32 F
Sept. 22
Oct. 1
Oct. 13
Oct. 18
Oct. 30
28 F
Oct. 3
Oct. 12
Oct. 26
Oct. 31
Nov. 9
24 F
Oct. 19
Oct. 29
Nov. 3
Nov. 15
Nov. 23
 

Payette

% Probability of Temperature or Lower on or Before Date

 
10%
25%
50%
75%
90%
36 F
Sept. 11
Sept. 22
Sept. 30
Oct. 7
Oct. 12
32 F
Sept. 22
Sept. 28
Oct. 11
Oct. 17
Oct. 21
28 F
Oct. 3
Oct. 12
Oct. 21
Oct. 29
Nov. 2
24 F
Oct. 20
Oct. 25
Nov. 2
Nov. 10
Nov. 21
 

Parma

% Probability of Temperature or Lower on or Before Date

 
10%
25%
50%
75%
90%
36 F
Sept. 9
Sept. 13
Sept. 21
Sept. 30
Oct. 5
32 F
Sept. 19
Sept. 23
Oct. 4
Oct. 9
Oct. 12
28 F
Sept. 23
Oct. 8
Oct. 16
Oct. 21
Oct. 28
24 F
Oct. 8
Oct. 17
Oct. 30
Nov. 8
Nov. 21
 

Nyssa

% Probability of Temperature or Lower on or Before Date

 
10%
25%
50%
75%
90%
36 F
Sept. 18
Sept. 23
Oct. 1
Oct. 8
Oct. 14
32 F
Sept. 24
Oct. 4
Oct. 12
Oct. 23
Oct. 29
28 F
Oct. 11
Oct. 17
Oct. 25
Oct. 31
Nov. 11
24 F
Oct. 23
Oct. 30
Nov. 10
Nov. 21
Nov. 25
 

Vale, Oregon

% Probability of Temperature or Lower on or Before Date

 
10%
25%
50%
75%
90%
36 F
Sept. 2
Sept. 10
Sept. 16
Sept. 23
Oct. 4
32 F
Sept. 17
Sept. 21
Sept. 24
Oct. 1
Oct. 9
28 F
Sept. 22
Sept. 26
Oct. 10
Oct. 15
Oct. 26
24 F
Oct. 2
Oct. 12
Oct. 20
Oct. 31
Nov. 6
 

Grand View

% Probability of Temperature or Lower on or Before Date

 
10%
25%
50%
75%
90%
36 F
Sept. 7
Sept. 10
Sept. 19
Sept. 25
Oct. 4
32 F
Sept. 22
Sept. 24
Oct. 5
Oct. 10
Oct. 13
28 F
Sept. 26
Oct. 8
Oct. 14
Oct. 24
Oct 30
24 F
Oct. 13
Oct 18
Oct. 26
Nov. 2
Nov. 9
 

Glenns Ferry

% Probability of Temperature or Lower on or Before Date

 
10%
25%
50%
75%
90%
36 F
Aug. 27
Sept. 6
Sept. 10
Sept. 15
Sept. 23
32 F
Sept. 8
Sept. 15
Sept. 22
Oct. 4
Oct. 7
28 F
Sept. 21
Sept. 28
Oct. 10
Oct. 16
Oct. 21
24 F
Sept. 28
Oct. 14
Oct. 24
Nov. 2
Nov. 11
 

Twin Falls

% Probability of Temperature or Lower on or Before Date

 
10%
25%
50%
75%
90%
36 F
Aug. 30
Sept. 5
Sept. 13
Sept. 21
Sept. 22
32 F
Sept. 11
Sept. 17
Sept. 24
Oct. 5
Oct. 6
28 F
Sept. 23
Oct. 2
Oct. 10
Oct. 17
Oct. 25
24 F
Oct. 12
Oct. 17
Oct. 25
Nov. 1
Nov. 15

Jerome

% Probability of Indicated Temperature or Lower on or After Date

 
90%
75%
50%
25%
10%
36 F
May 10
May 18
May 27
June 9
June 13
32 F
April 30
May 4
May 10
May 20
June 2
28 F
April 8
April 15
April 27
May 3
May 7
24 F
March 16
March 25
April 4
April 13
April 20

Jerome

% Probability of Temperature or Lower on or Before Date

 
10%
25%
50%
75%
90%
36 F
Sept. 6
Sept. 14
Sept. 21
Oct. 2
Oct. 5
32 F
Sept. 21
Sept. 24
Oct. 5
Oct. 12
Oct. 20
28 F
Oct. 2
Oct. 8
Oct. 17
Oct. 27
Nov. 7
24 F
Oct. 12
Oct. 17
Oct. 30
Nov. 7
Nov. 15