Percent Frequency of Daily Mean Temperatures
(1948-1992)
Temp Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Annual
>=90 0.0 0.0 0.0 0.0 0.0 0.0 0.1 0.4 0.0 0.0 0.0 0.0 *
>=85 0.0 0.0 0.0 0.0 0.0 1.1 3.1 2.3 0.2 0.0 0.0 0.0 0.6
>=80 0.0 0.0 0.0 0.0 0.5 7.0 15.8 10.7 3.2 0.1 0.0 0.0 3.2
>=75 0.0 0.0 0.0 0.7 4.9 22.0 42.0 31.5 8.0 0.2 0.0 0.0 9.3
>=70 0.0 0.0 0.0 2.4 15.5 46.1 73.4 59.4 18.8 2.1 0.0 0.0 18.5
>=65 0.0 0.0 0.3 5.6 29.7 71.9 93.2 82.9 35.5 7.8 0.1 0.0 27.7
>=60 0.0 0.0 0.8 13.3 49.2 91.0 99.5 96.8 59.6 19.9 0.7 0.0 36.4
>=55 0.0 0.0 2.4 24.3 71.3 98.1 99.9 99.6 80.7 34.0 3.2 0.1 43.4
>=50 0.0 0.2 5.1 40.1 87.7 99.9 100 99.9 93.5 53.4 8.9 0.3 49.7
>=45 0.1 1.0 12.2 60.0 96.8 100 100 100 98.4 72.8 19.0 1.0 55.7
>=40 0.6 3.1 23.1 78.8 99.4 100 100 100 100 89.2 33.3 3.1 61.4
>=35 4.6 11.9 40.3 91.9 99.9 100 100 100 100 96.6 54.5 10.1 68.0
>=30 15.0 27.5 62.1 98.0 100 100 100 100 100 99.3 72.8 27.9 75.6
>=25 28.6 43.1 77.3 99.6 100 100 100 100 100 100 86.6 46.3 82.1
>=20 42.3 55.7 86.8 99.9 100 100 100 100 100 100 92.8 61.6 86.8
>=15 55.5 69.5 93.4 100 100 100 100 100 100 100 97.7 73.2 90.9
>=10 65.2 79.9 97.9 100 100 100 100 100 100 100 99.0 82.8 93.8
>=5 76.2 88.2 99.5 100 100 100 100 100 100 100 99.8 89.4 96.2
>=0 86.9 95.0 99.7 100 100 100 100 100 100 100 100 95.8 98.1
>=-5 93.6 97.5 99.9 100 100 100 100 100 100 100 100 98.3 99.1
>=-10 97.7 99.6 100 100 100 100 100 100 100 100 100 99.4 99.7
>=-15 99.5 99.9 100 100 100 100 100 100 100 100 100 99.7 99.9
>=-20 100 100 100 100 100 100 100 100 100 100 100 99.9 100
>=-25 100 100 100 100 100 100 100 100 100 100 100 100 100
Mean 15.3 20.5 32.0 47.7 59.8 68.8 73.4 71.1 61.9 50.8 35.4 21.4 46.8

These numbers are in reference to the percentage of time that the mean temperature is at or above the indicated temperatures.

Ex. >=40 is for mean temperatures from 40 to 44 degrees, etc etc...


 

Percent Chance for Measurable Rain
(based on past occurences)
Day Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
1 27% 26% 22% 31% 36% 38% 25% 35% 28% 21% 35% 36%
2 36% 26% 23% 32% 36% 36% 28% 32% 30% 25% 23% 31%
3 25% 20% 25% 33% 35% 32% 44% 44% 25% 37% 16% 28%
4 31% 29% 35% 39% 31% 40% 41% 34% 31% 27% 16% 30%
5 23% 34% 33% 38% 32% 42% 32% 32% 31% 31% 26% 34%
6 29% 32% 33% 38% 32% 40% 32% 36% 30% 35% 25% 34%
7 14% 27% 27% 25% 37% 50% 25% 35% 32% 28% 35% 28%
8 24% 25% 29% 27% 42% 34% 33% 39% 39% 31% 22% 26%
9 26% 24% 18% 29% 34% 34% 34% 40% 36% 30% 29% 22%
10 25% 25% 22% 33% 31% 42% 34% 36% 32% 29% 24% 28%
11 25% 20% 39% 28% 41% 44% 30% 26% 35% 28% 21% 28%
12 32% 29% 36% 33% 33% 46% 37% 24% 38% 27% 33% 35%
13 31% 33% 39% 35% 39% 41% 37% 27% 35% 25% 26% 21%
14 22% 25% 31% 39% 45% 37% 37% 23% 39% 22% 28% 28%
15 30% 21% 34% 41% 40% 34% 27% 34% 33% 32% 28% 32%
16 31% 25% 30% 38% 38% 37% 31% 33% 26% 27% 27% 28%
17 35% 22% 31% 32% 33% 36% 38% 26% 30% 23% 24% 24%
18 25% 25% 44% 35% 46% 46% 34% 29% 38% 25% 25% 19%
19 28% 24% 33% 31% 39% 34% 31% 26% 46% 26% 26% 35%
20 30% 24% 28% 39% 28% 38% 28% 30% 45% 28% 38% 35%
21 25% 25% 23% 38% 38% 32% 35% 27% 38% 27% 29% 27%
22 30% 28% 31% 27% 41% 36% 29% 28% 28% 30% 23% 24%
23 24% 29% 32% 35% 35% 36% 30% 28% 28% 28% 30% 32%
24 31% 22% 31% 38% 40% 35% 26% 23% 35% 26% 26% 29%
25 34% 21% 34% 37% 44% 40% 26% 28% 32% 20% 29% 24%
26 29% 21% 36% 31% 42% 41% 32% 31% 35% 22% 40% 30%
27 35% 27% 24% 35% 45% 36% 40% 31% 21% 23% 35% 24%
28 27% 22% 34% 36% 38% 33% 29% 29% 34% 25% 30% 30%
29 30% 13% 37% 41% 35% 36% 23% 29% 27% 25% 27% 22%
30 27%   31% 42% 33% 30% 33% 28% 34% 28% 22% 29%
31 23%   32%   32%   38% 34%   35%   26%

Statistics are based on records dating back to September of 1896. There are some gaps in the data with a few years through the record missing for several months. This is mostly due to the fact that the data for those months weren't actually recorded.


 

Percent Frequency of Temperature vs. Wind Direction from hourly observations
(1948-1992)

Temp NNW&N NNE&NE ENE&E ESE&SE SSE&S SSW&SW WSW&W WNW&NW Calm
>=102 0 .0 0.0 0.0 0.0 22.7 68.2 4.5 0.0 0.0
>=97 1.3 0.0 0.0 1.3 40.7 38.7 6.0 6.0 0.0
>=92 2.1 0.1 0.8 4.1 44.4 31.0 7.1 5.5 0.0
>=87 3.4 1.2 1.9 6.4 44.0 22.6 6.6 9.3 0.5
>=82 5.5 1.9 2.6 10.2 39.0 16.5 6.8 12.3 0.8
>=77 6.2 2.7 4.2 12.5 34.6 12.5 6.6 13.0 1.2
>=72 7.3 3.0 5.8 15.4 30.7 8.7 5.4 11.7 2.1
>=67 8.2 3.4 6.9 18.8 25.0 6.4 4.8 11.6 2.9
>=62 9.4 3.9 7.6 20.7 20.3 5.1 4.5 10.7 3.6
>=57 10.0 4.1 8.3 20.3 17.8 4.4 4.5 11.3 3.2
>=52 10.8 4.3 8.7 20.5 16.7 3.8 4.8 12.6 3.1
>=47 11.7 4.8 8.6 19.1 15.6 4.1 5.4 13.7 2.8
>=42 12.1 4.7 8.8 17.4 14.6 4.5 6.4 15.5 2.4
>=37 12.6 4.2 7.0 14.9 16.2 5.6 7.5 17.5 2.4
>=32 13.2 3.9 6.8 13.1 16.2 5.0 6.4 19.2 2.6
>=27 13.4 4.0 6.2 12.4 16.0 4.3 6.6 20.2 3.2
>=22 14.5 3.9 5.8 11.7 15.5 4.1 6.8 19.8 3.6
>=17 14.6 3.5 4.7 10.3 14.8 3.9 7.3 20.9 3.8
>=12 16.1 2.5 3.8 9.1 14.7 3.6 8.3 23.0 3.9
>=7 15.2 2.2 3.0 8.5 11.9 3.4 8.9 22.9 5.1
>=2 15.4 1.7 1.8 6.4 10.6 3.0 9.8 24.5 5.2
>=-3 13.9 2.2 1.7 5.6 10.9 3.1 9.5 23.7 5.4
>=-8 12.7 2.5 0.9 4.9 10.0 3.5 10.0 20.6 5.2
>=-13 11.2 2.6 0.8 3.8 11.8 3.0 8.9 19.5 6.4
>=-18 8.2 2.7 1.4 3.8 12.1 2.8 7.7 14.1 7.7
>=-23 7.0 1.7 1.9 4.1 12.4 2.9 7.6 18.0 5.2
>=-28 5.9 0.0 0.8 6.8 9.3 1.7 6.8 21.2 7.6
>=-33 11.8 0.0 0.0 5.9 47.1 0.0 0.0 0.0 0.0
>=-38 0.0 0.0 0.0 66.7 33.3 0.0 0.0 0.0 0.0
Totals 11.2 3.7 6.4 15.1 19.5 5.8 6.3 15.7 3.0
Ex. >=57 is from 57 to 61 degrees


 

Percent Frequency of Daily Precipitation Amounts
(1948-1992)

Month None Trace .01 <=.05 <=.10 <=.25 <=.50 <=1.0 <=2.5 <=5.0 Percent of Days with >=.01
Jan 42.1 32.0 3.7 8.8 5.1 4.5 3.2 0.6 0.1 0.0 26.0
Feb 50.4 25.1 3.3 7.9 4.2 5.5 2.5 0.8 0.2 0.0 24.5
Mar 48.9 19.7 3.7 8.1 4.6 6.2 4.5 3.3 0.8 0.0 31.4
Apr 50.1 16.3 2.9 5.9 5.0 7.0 6.0 5.3 1.3 0.1 33.6
May 50.5 13.7 2.9 6.5 4.4 8.2 6.5 5.5 1.6 0.1 35.8
Jun 53.0 11.3 2.1 6.5 4.4 8.0 6.8 4.7 3.0 0.2 35.8
Jul 58.4 9.5 2.2 5.9 4.1 6.3 5.7 4.8 2.4 0.4 32.0
Aug 59.5 9.7 1.9 3.9 4.6 6.5 6.2 4.4 2.9 0.2 30.8
Sep 57.3 11.3 2.7 5.6 3.3 7.6 5.3 4.0 2.9 0.1 31.4
Oct 61.7 12.8 2.1 5.6 3.2 6.6 3.9 3.3 0.8 0.0 25.5
Nov 51.1 21.7 3.3 8.0 3.2 6.2 3.3 2.3 0.9 0.1 27.2
Dec 44.2 27.1 3.4 9.9 5.2 6.2 2.6 1.2 0.1 0.0 28.7
Annual 52.3 17.4 2.9 6.9 4.3 6.6 4.7 3.4 1.4 0.1 30.3
ex. <=.05 means from .02 to .05; <=.10 means from .06 to .10; etc. etc...


 

Percent Frequency of Various Weather Conditions from Hourly Observations
(1948-1992)

Month Thunderstorm Rain or Drizzle Freezing rain or Freezing Drizzle Snow or Sleet Percent of Obs with Precip Fog Haze or Smoke Blowing Snow Percent of Obs with an Obscuration to Vision
Jan * 1.7 0.8 14.3 16.5 13.4 4.4 1.3 18.5
Feb * 2.1 0.7 12.0 14.4 13.9 6.5 0.7 20.1
Mar 0.3 5.1 0.3 9.7 14.7 13.0 3.4 0.6 16.7
Apr 0.9 10.1 * 2.7 12.6 8.9 1.5 0.1 10.7
May 1.6 9.0 0.0 0.1 9.1 6.8 2.1 0.0 8.7
Jun 2.6 6.8 0.0 0.0 6.8 5.2 3.5 0.0 8.4
Jul 2.3 5.0 0.0 0.0 5.0 6.0 4.7 0.0 10.3
Aug 2.1 6.1 0.0 0.0 6.0 10.1 5.3 0.0 14.5
Sep 1.3 7.8 0.0 0.0 7.7 12.1 2.7 0.0 14.5
Oct 0.4 7.3 0.0 0.5 7.6 10.2 3.1 0.0 12.9
Nov 0.1 6.8 0.3 8.0 14.7 14.1 2.8 0.4 16.8
Dec * 3.2 1.0 13.4 17.3 17.3 3.8 0.6 21.1
Year 1.0 5.9 0.3 5.0 11.0 10.9 3.6 0.3 14.4
*less than .05 percent

 

These percentages refer to the frequency of the various weather conditions on any given hourly observation for each month. Over 10,000 observations were used for each month.
January

Hour

L.S.T.

Thunderstorm Rain or Drizzle Freezing Rain or Freezing Drizzle Snow or Sleet Percent of Obs with Precip Fog Haze or Smoke Blowing Snow Percent of Obs with an Obscuration to Vision
00 0.0 1.7 0.8 15.0 17.3 13.2 3.3 1.4 17.1
03 0.0 1.2 1.0 13.8 15.8 14.6 2.2 1.2 17.4
06 0.1 1.9 0.9 14.8 17.1 15.3 2.4 1.2 18.1
09 0.0 2.0 0.9 16.4 18.8 18.8 5.9 1.5 25.2
12 0.0 2.4 0.6 13.2 15.8 12.7 7.3 1.3 20.8
15 0.0 1.9 0.4 12.9 15.1 10.1 5.5 1.4 16.8
18 0.0 1.5 0.7 13.3 15.2 11.0 4.9 1.2 17.0
21 0.0 1.4 1.0 14.8 16.6 11.4 3.6 1.4 16.0
ALL * 1.7 0.8 14.3 16.5 13.4 4.4 1.3 18.5

 

 

*less than .05 percent

 

February

Hour

L.S.T.

Thunderstorm Rain or Drizzle Freezing Rain or Freezing Drizzle Snow or Sleet Percent of Obs with Precip Fog Haze or Smoke Blowing Snow Percent of Obs with an Obscuration to Vision
00 0.0 2.2 1.2 12.5 15.4 13.4 4.8 0.9 18.0
03 0.0 2.8 0.9 13.1 16.2 17.0 4.0 0.6 20.5
06 0.0 2.2 1.3 13.2 16.4 18.6 3.2 0.8 22.1
09 0.1 2.4 0.8 14.7 17.0 22.6 9.4 0.7 30.5
12 0.1 1.3 0.4 11.5 12.9 11.7 9.7 0.6 21.1
15 0.0 1.6 0.2 9.4 10.9 7.6 8.7 0.6 16.5
18 0.2 1.8 0.4 10.1 11.9 9.4 6.7 0.6 16.0
21 0.0 2.6 0.8 11.8 14.2 10.7 5.4 0.7 16.3
ALL * 2.1 0.7 12.0 14.4 13.9 6.5 0.7 20.1

 

*less than .05 percent

 

March

Hour

L.S.T.

Thunderstorm Rain or Drizzle Freezing Rain or Freezing Drizzle Snow or Sleet Percent of Obs with Precip Fog Haze or Smoke Blowing Snow Percent of Obs with an Obscuration to Vision
00 0.4 5.1 0.7 9.9 15.4 11.9 1.9 0.7 14.7
03 0.3 4.4 0.3 10.4 14.6 15.2 1.7 0.7 17.3
06 0.1 4.7 0.5 10.4 15.1 19.6 2.7 0.5 21.9
09 0.1 4.7 0.1 9.9 14.2 17.2 6.0 0.5 22.7
12 0.2 5.1 0.1 9.5 13.9 10.3 5.4 0.6 16.0
15 0.1 5.7 0.1 9.0 14.8 8.8 3.7 0.8 13.3
18 0.5 5.9 0.4 9.2 15.1 10.2 3.7 0.3 13.9
21 0.7 5.4 0.4 9.6 14.8 10.6 2.4 0.9 13.8
ALL 0.3 5.1 0.3 9.7 14.7 13.0 3.4 0.6 16.7

 

*less than .05 percent

 

April

Hour

L.S.T.

Thunderstorm Rain or Drizzle Freezing Rain or Freezing Drizzle Snow or Sleet Percent of Obs with Precip Fog Haze or Smoke Blowing Snow Percent of Obs with an Obscuration to Vision
00 1.0 10.5 0.0 2.8 13.0 8.3 1.1 0.2 9.9
03 1.5 10.3 0.1 2.7 13.0 10.2 0.9 0.0 11.3
06 0.7 9.6 0.0 3.3 12.7 16.1 1.5 0.1 17.5
09 0.4 8.9 0.1 3.8 12.5 11.0 2.9 0.1 14.1
12 0.8 9.5 0.0 2.8 12.0 6.1 2.1 0.1 8.4
15 0.6 10.1 0.0 2.1 11.8 5.3 1.3 0.1 6.8
18 1.0 11.8 0.0 1.7 13.2 7.1 1.5 0.2 8.8
21 1.4 10.4 0.0 2.4 12.4 7.57 1.1 0.1 8.9
ALL 0.9 10.1 * 2.7 12.6 8.99 1.5 0.1 10.7

 

*less than .05 percent

 

May

Hour

L.S.T.

Thunderstorm Rain or Drizzle Freezing Rain or Freezing Drizzle Snow or Sleet Percent of Obs with Precip Fog Haze or Smoke Blowing Snow Percent of Obs with an Obscuration to Vision
00 2.4 9.5 0.0 0.2 9.6 6.8 1.2 0.0 7.7
03 1.9 8.9 0.0 0.1 9.0 9.4 0.4 0.0 9.7
06 1.1 8.4 0.0 0.1 8.5 14.1 1.8 0.0 15.3
09 0.7 8.6 0.0 0.1 8.7 7.6 4.4 0.0 11.6
12 0.6 8.0 0.0 0.2 8.2 4.0 2.8 0.0 6.7
15 1.9 9.6 0.0 0.1 9.6 3.7 2.2 0.0 5.7
18 1.8 9.1 0.0 0.1 9.2 4.2 1.8 0.0 6.1
21 2.4 9.9 0.0 0.1 10.0 5.1 1.9 0.0 6.8
ALL 1.6 9.0 0.0 0.1 9.1 6.8 2.1 0.0 8.7

 

*less than .05 percent

 

June

Hour

L.S.T.

Thunderstorm Rain or Drizzle Freezing Rain or Freezing Drizzle Snow or Sleet Percent of Obs with Precip Fog Haze or Smoke Blowing Snow Percent of Obs with an Obscuration to Vision
00 3.9 7.6 0.0 0.0 7.6 5.0 2.2 0.0 6.8
03 3.3 7.1 0.0 0.0 7.1 8.3 1.9 0.0 10.1
06 2.1 8.1 0.0 0.0 8.1 15.3 3.8 0.0 18.0
09 1.3 7.0 0.0 0.0 7.0 4.9 5.4 0.0 9.9
12 2.1 6.7 0.0 0.0 6.7 2.4 3.7 0.0 6.1
15 1.6 4.6 0.0 0.0 4.6 1.1 3.4 0.0 4.5
18 2.9 7.0 0.0 0.0 7.0 1.7 3.4 0.0 5.1
21 3.4 6.7 0.0 0.0 6.6 3.0 4.2 0.0 6.8
ALL 2.6 6.8 0.0 0.0 6.8 5.2 3.5 0.0 8.4

 

*less than .05 percent

 

July

Hour

L.S.T.

Thunderstorm Rain or Drizzle Freezing Rain or Freezing Drizzle Snow or Sleet Percent of Obs with Precip Fog Haze or Smoke Blowing Snow Percent of Obs with an Obscuration to Vision
00 2.7 5.3 0.0 0.0 5.2 5.7 3.6 0.0 8.8
03 3.7 6.1 0.0 0.0 6.1 10.2 2.7 0.0 12.3
06 2.2 4.6 0.0 0.0 4.6 19.2 4.5 0.0 22.7
09 1.6 4.7 0.0 0.0 4.7 6.2 7.6 0.0 13.2
12 1.6 3.9 0.0 0.0 3.9 2.2 5.6 0.0 7.6
15 2.0 4.8 0.0 0.0 4.8 1.3 4.2 0.0 5.5
18 2.7 4.9 0.0 0.0 4.9 1.1 4.2 0.0 5.1
21 2.5 5.7 0.0 0.0 5.7 2.1 5.4 0.0 7.1
ALL 2.3 5.0 0.0 0.0 5.0 6.0 4.7 0.0 10.3

 

*less than .05 percent

 

August

Hour

L.S.T.

Thunderstorm Rain or Drizzle Freezing Rain or Freezing Drizzle Snow or Sleet Percent of Obs with Precip Fog Haze or Smoke Blowing Snow Percent of Obs with an Obscuration to Vision
00 2.6 5.0 0.0 0.0 5.0 8.9 3.5 0.0 11.5
03 3.2 6.6 0.0 0.0 6.5 16.7 3.5 0.0 18.9
06 2.4 7.9 0.0 0.0 7.9 29.6 4.5 0.0 32.4
09 1.5 7.3 0.0 0.0 7.2 11.1 9.6 0.0 19.6
12 1.6 5.4 0.0 0.0 5.4 3.7 6.0 0.0 9.3
15 1.5 5.4 0.0 0.0 5.4 2.8 4.9 0.0 7.5
18 2.2 5.2 0.0 0.0 5.2 2.9 4.8 0.0 7.5
21 2.2 5.6 0.0 0.0 5.6 5.2 5.3 0.0 9.7
ALL 2.1 6.1 0.0 0.0 6.0 10.1 5.3 0.0 14.5

 

*less than .05 percent

 

September

Hour

L.S.T.

Thunderstorm Rain or Drizzle Freezing Rain or Freezing Drizzle Snow or Sleet Percent of Obs with Precip Fog Haze or Smoke Blowing Snow Percent of Obs with an Obscuration to Vision
00 2.1 9.1 0.0 0.0 9.0 10.2 1.8 0.0 11.6
03 2.4 8.7 0.0 0.0 8.5 18.6 1.3 0.0 19.3
06 1.1 8.8 0.0 0.0 8.8 28.9 1.9 0.0 30.2
09 0.8 7.7 0.0 0.0 7.7 16.1 4.0 0.0 19.6
12 1.0 7.0 0.0 0.0 6.9 5.8 4.2 0.0 9.6
15 0.7 6.6 0.0 0.0 6.6 4.5 2.7 0.0 7.1
18 0.8 6.7 0.0 0.0 6.7 5.6 3.5 0.0 8.8
21 1.7 7.4 0.0 0.0 7.3 7.1 2.5 0.0 9.5
ALL 1.3 7.8 0.0 0.0 7.7 12.1 2.7 0.0 14.5

 

*less than .05 percent

 

October

Hour

L.S.T.

Thunderstorm Rain or Drizzle Freezing Rain or Freezing Drizzle Snow or Sleet Percent of Obs with Precip Fog Haze or Smoke Blowing Snow Percent of Obs with an Obscuration to Vision
00 0.7 7.6 0.0 0.2 7.6 10.6 2.7 0.0 12.6
03 0.4 6.9 0.0 0.6 7.2 12.6 1.7 0.0 13.8
06 0.3 7.2 0.0 0.7 7.7 18.2 1.6 0.0 19.4
09 0.5 7.2 0.0 0.7 7.6 14.1 5.4 0.0 18.7
12 0.1 7.0 0.0 0.4 7.2 7.2 4.2 0.0 11.0
15 0.3 6.9 0.0 0.4 7.2 5.1 3.2 0.0 8.1
18 0.6 7.9 0.0 0.4 8.2 6.0 3.4 0.0 9.0
21 0.6 8.1 0.0 0.5 8.5 8.0 2.8 0.0 10.5
ALL 0.4 7.3 0.0 0.5 7.6 10.2 3.1 0.0 12.9

 

*less than .05 percent

 

November

Hour

L.S.T.

Thunderstorm Rain or Drizzle Freezing Rain or Freezing Drizzle Snow or Sleet Percent of Obs with Precip Fog Haze or Smoke Blowing Snow Percent of Obs with an Obscuration to Vision
00 0.1 7.0 0.2 7.3 14.2 14.2 1.8 0.6 15.9
03 0.0 7.9 0.4 7.1 14.5 16.5 1.4 0.4 17.4
06 0.1 7.5 0.4 8.2 15.3 17.4 1.9 0.4 19.1
09 0.1 6.8 0.3 9.1 16.1 20.1 4.3 0.1 23.9
12 0.0 6.6 0.2 7.9 14.3 12.4 3.9 0.2 16.4
15 0.2 6.0 0.1 8.2 14.0 9.6 3.3 0.1 12.7
18 0.3 6.0 0.1 7.7 13.9 11.5 3.6 0.6 15.3
21 0.2 6.7 0.3 8.5 15.2 11.3 2.2 0.7 13.6
ALL 0.1 6.8 0.3 8.0 14.7 14.1 2.8 0.4 16.8

 

*less than .05 percent

 

December

Hour

L.S.T.

Thunderstorm Rain or Drizzle Freezing Rain or Freezing Drizzle Snow or Sleet Percent of Obs with Precip Fog Haze or Smoke Blowing Snow Percent of Obs with an Obscuration to Vision
00 0.0 3.8 1.2 13.8 18.6 17.2 2.5 0.7 19.7
03 0.1 3.5 0.9 14.1 18.2 18.3 2.4 0.7 20.7
06 0.0 3.5 1.4 14.6 19.1 19.5 1.8 0.6 21.5
09 0.0 2.9 1.5 14.3 18.1 23.9 4.6 0.4 27.7
12 0.0 2.7 0.4 14.1 17.1 17.2 6.3 0.4 23.0
15 0.0 2.7 0.5 12.5 15.4 14.1 4.8 0.6 18.9
18 0.0 2.9 0.9 11.6 15.2 14.3 4.8 0.9 19.4
21 0.0 3.3 1.1 12.5 16.6 14.3 3.3 0.4 17.6
ALL * 3.2 1.0 13.4 17.3 17.3 3.8 0.6 21.1

 

*less than .05 percent

 

Percent Frequency of Hourly Total Sky Cover Amounts
(1948-1992)

Annual
Hour (L.S.T.) Clear Scattered Broken Overcast
00 37.6 13.5 10.7 38.2
03 36.5 12.0 11.2 40.3
06 25.3 15.1 14.6 45.0
09 20.9 16.6 17.4 45.1
12 16.8 20.9 19.7 42.7
15 15.9 21.6 20.9 41.6
18 21.1 20.9 17.9 40.1
21 31.8 17.8 12.5 38.0
ALL 25.0 17.6 15.9 41.5

January

 

Hour (L.S.T.) Clear Scattered Broken Overcast
00 33.1 10.5 9.2 47.1
03 34.4 9.1 8.5 48.0
06 33.1 9.0 9.4 48.5
09 22.2 12.0 13.1 52.7
12 22.2 14.6 14.9 48.3
15 22.2 13.8 14.9 49.0
18 25.2 14.3 14.5 46.1
21 30.9 13.1 9.5 46.6
ALL 27.6 12.2 11.9 48.3

 

February
Hour (L.S.T.) Clear Scattered Broken Overcast
00 38.0 9.0 10.4 42.6
03 36.4 9.1 9.8 44.7
06 33.6 10.2 9.8 46.4
09 23.3 13.0 15.8 47.8
12 22.4 15.3 16.3 46.1
15 21.9 16.3 17.1 44.7
18 23.6 17.0 13.9 45.5
21 33.7 14.6 9.3 42.4
ALL 28.6 13.3 13.0 45.1

March

 

Hour (L.S.T.) Clear Scattered Broken Overcast
00 35.3 10.4 9.0 45.3
03 33.9 9.0 10.4 46.6
06 25.1 14.8 10.7 49.4
09 20.2 13.9 16.0 49.9
12 18.1 16.9 15.1 49.9
15 16.9 15.5 16.6 50.9
18 18.2 15.9 14.7 51.2
21 30.4 13.3 9.5 46.8
ALL 24.2 14.0 12.9 48.9

 

April
Hour (L.S.T.) Clear Scattered Broken Overcast
00 34.9 11.6 9.9 43.6
03 34.6 11.0 10.3 44.1
06 24.0 13.8 15.2 47.0
09 21.5 14.4 15.5 48.6
12 17.9 17.6 16.5 48.0
15 15.4 19.1 18.7 46.8
18 17.4 17.9 17.3 47.3
21 30.6 16.1 10.8 42.5
ALL 23.9 15.4 14.5 46.1

May
Hour (L.S.T.) Clear Scattered Broken Overcast
00 37.9 16.0 13.4 32.7
03 33.8 16.6 13.5 36.2
06 22.1 17.2 19.5 41.2
09 20.2 18.6 19.3 41.9
12 13.7 23.3 23.0 40.0
15 12.7 22.2 24.6 40.6
18 15.9 22.2 22.5 39.5
21 26.7 22.8 16.6 33.9
ALL 22.1 20.1 19.4 38.5

June
Hour (L.S.T.) Clear Scattered Broken Overcast
00 41.5 17.3 13.2 28.1
03 37.5 16.8 14.7 31.0
06 20.6 20.5 18.6 40.3
09 21.0 21.6 23.0 34.4
12 11.0 28.7 25.8 34.4
15 9.9 29.3 29.0 31.9
18 16.9 28.4 26.2 28.4
21 26.0 27.5 20.2 26.2
ALL 22.0 24.2 21.8 32.0

July
Hour (L.S.T.) Clear Scattered Broken Overcast
00 44.7 21.0 12.8 21.5
03 43.1 16.5 14.3 26.0
06 21.2 21.9 20.7 36.2
09 24.2 22.0 23.1 30.8
12 11.5 32.0 29.1 27.4
15 9.2 36.0 28.2 26.6
18 20.1 34.0 22.3 23.7
21 34.0 28.2 17.8 20.0
ALL 24.9 26.9 21.5 26.7

August
Hour (L.S.T.) Clear Scattered Broken Overcast
00 45.4 18.2 12.4 24.0
03 42.6 13.5 12.9 31.0
06 19.4 18.2 20.4 42.0
09 22.4 22.4 20.4 34.8
12 15.1 30.5 24.4 30.0
15 13.2 32.7 28.7 25.4
18 23.9 30.8 21.4 23.9
21 38.6 24.4 14.3 22.7
ALL 26.6 24.3 19.8 29.3

September
Hour (L.S.T.) Clear Scattered Broken Overcast
00 44.1 13.3 12.0 30.6
03 41.1 13.8 11.7 33.3
06 20.8 18.4 18.0 42.8
09 22.5 18.4 18.2 41.0
12 18.5 24.7 21.0 35.8
15 17.3 26.3 23.3 33.2
18 24.5 23.6 20.8 31.1
21 40.1 17.7 12.5 29.7
ALL 27.8 19.9 17.5 34.8

October
Hour (L.S.T.) Clear Scattered Broken Overcast
00 40.5 12.7 10.5 36.3
03 41.8 11.4 9.9 36.9
06 28.0 18.3 15.2 38.6
09 22.4 17.5 16.6 43.5
12 21.2 19.3 18.9 40.6
15 20.6 20.9 20.1 38.3
18 26.5 19.4 17.6 36.6
21 37.5 14.9 11.3 36.3
ALL 29.1 17.1 15.3 38.5

November
Hour (L.S.T.) Clear Scattered Broken Overcast
00 28.2 11.0 7.7 53.1
03 29.4 9.7 10.0 50.9
06 26.0 10.4 9.6 54.0
09 14.7 11.9 14.3 59.2
12 13.7 13.5 16.2 56.6
15 14.3 13.0 16.8 55.9
18 19.7 13.5 12.7 54.1
21 25.3 10.7 9.6 54.4
ALL 20.9 11.8 12.3 55.0

December
Hour (L.S.T.) Clear Scattered Broken Overcast
00 27.4 10.4 8.2 54.0
03 28.6 7.9 8.4 55.2
06 30.2 8.5 7.8 53.5
09 16.5 13.7 13.0 56.8
12 16.3 13.5 15.1 55.1
15 17.3 14.3 12.5 55.8
18 21.6 14.2 10.7 53.5
21 27.3 10.1 8.6 54.0
ALL 22.8 11.7 10.7 54.7

 


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