Pensacola
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Pensacola clear sky chart from 2005-11-05 to 2017-08-12.

This page is a summary of past forecasts. Even though it's based only on forecasts, some people use these pages as clue to a site's climate. But climate data based on actual observation should be preferred (if you can find it!).

Cloud, Transparency and Seeing forecasts are summarized individually. But because good observing conditions require a combination of minimum cloud cover, transparency and seeing, the individual forecast summaries can be difficult to interpret. The observing conditions section counts the combinations of conditions needed for common types of astronomical observation.

Observing Conditions

The following tables count the occurrence of the combinations of forecast and darkness conditions needed for different observations. Conditions are rated by by what percentage of the hours the observation would likely be attempted are usable.
Observation TypeMinimum conditions for hour to be usableOut of hours
Clear of CloudsTransparencySeeingSky Brightness
Planetary:50%(no limit)Average(no limit)Nighttime Hours
Deep Sky:70%Average(no limit)5.9Nighttime Hours
CCD Imaging:70%Below AveragePoor(no limit)Nighttime Hours

Percentages are of nighttime hours per month, or per year, when a particular observing conditions was met. Deep Sky percentages never exceed 50% because the moon is up half the time. Deep sky percentages are much lower for charts at high latitudes because of fewer dark hours in the summer.

Overall

PlanetaryData
Pts
Deep Sky
Max 60%
Data
Pts
Both Planetary and Deep Sky
Max 60%
Data
Pts
Either Planetary or Deep SkyData
Pts
CCD ImagingData
Pts
Night
51%
15106
23%
46620
16%
15062
59%
15062
27%
27832

By Month

MonthDays of MonthPlanetaryData
Pts
Deep Sky
Max 60%
Data
Pts
Both Planetary and Deep Sky
Max 60%
Data
Pts
Either Planetary or Deep SkyData
Pts
CCD ImagingData
Pts
January1st to 15thNight
31%
720
23%
2213
10%
716
44%
716
22%
1383
January16th to endNight
33%
768
25%
2304
13%
768
44%
768
23%
1491
February1st to 15thNight
37%
703
28%
2107
13%
699
51%
699
28%
1254
February16th to endNight
35%
631
23%
1893
11%
631
45%
631
23%
1213
March1st to 15thNight
38%
720
23%
2160
11%
720
48%
720
26%
1303
March16th to endNight
47%
686
26%
2036
17%
686
55%
686
29%
1180
April1st to 15thNight
48%
539
25%
1797
20%
539
57%
539
28%
1006
April16th to endNight
56%
540
29%
1800
23%
540
67%
540
34%
917
May1st to 15thNight
56%
539
22%
1745
18%
539
63%
539
32%
932
May16th to endNight
60%
561
23%
1682
15%
561
68%
561
30%
958
June1st to 15thNight
63%
540
14%
1620
12%
540
65%
540
29%
957
June16th to endNight
68%
540
17%
1620
16%
540
69%
540
29%
977
July1st to 15thNight
73%
510
11%
1536
11%
510
74%
510
27%
959
July16th to endNight
68%
564
10%
1772
11%
531
73%
531
24%
1119
August1st to 15thNight
74%
527
11%
1750
13%
524
74%
524
26%
1053
August16th to endNight
65%
525
14%
1750
16%
525
66%
525
22%
1134
September1st to 15thNight
62%
564
16%
1719
16%
564
64%
564
25%
1121
September16th to endNight
64%
657
25%
1815
17%
657
70%
657
29%
1133
October1st to 15thNight
64%
660
33%
1815
26%
660
69%
660
40%
1016
October16th to endNight
58%
704
33%
2034
26%
704
64%
704
36%
1159
November1st to 15thNight
49%
700
31%
2276
26%
700
59%
700
31%
1234
November16th to endNight
44%
720
29%
2340
19%
720
58%
720
28%
1307
December1st to 15thNight
40%
720
25%
2340
18%
720
50%
720
23%
1406
December16th to endNight
34%
768
20%
2496
12%
768
45%
768
18%
1620

Individual Forecasts

The length of each colored bar in the "occurrence of each Forecast" column is proportional to the number of times the chart forecast that color. The percentages are of the total number of hours per month, or per year, with a particular forecast. The colors as the same as those used in clear sky charts.

Note: Transparency probabilities are only counted for those hours that have 30% or less cloud cover. Seeing probabilities are only counted for those hours that have 80% or less cloud cover. If that's too tricky, try Observing Conditions instead.

Overall

Occurrence of each ForecastData
Points
Cloud CoverDay
9%4245%35%5%6%9%43%
47320
Night
9%42442445%8%47%
46838
TransparencyDay
34%8%14%20%16%6%
47034
Night
33%6%14%19%18%7%
46628
SeeingDay
10%8%10%20%30%18%
5030
Night
10%17%13%21%25%10%
15110

By Month

Percentage Cloud Cover SE (2006-)
Color Meanings:
Overcast 90% covered 80% covered 70% covered 60% covered 50% covered 40% covered 30% covered 20% covered 10% covered Clear
MonthDays in MonthOccurrence of each ForecastData
Points
January1st to 15thDay
11%5%25%43445%8%44%
1722
16th to endDay
16%6%24325%43444%
1920
February1st to 15thDay
12%6%2342446%6%46%
1750
16th to endDay
13%5%24324447%47%
1580
March1st to 15thDay
11%6%24424448%46%
1800
16th to endDay
10%5%25%43335%6%49%
2194
April1st to 15thDay
11%5%2443435%7%47%
2151
16th to endDay
6%31342345%8%53%
2160
May1st to 15thDay
5%424435%46%8%49%
2202
16th to endDay
6%3145%25%6%6%10%47%
2431
June1st to 15thDay
6%425%5%36%7%8%12%36%
2340
16th to endDay
6%4245%47%6%8%12%36%
2340
July1st to 15thDay
6%426%7%47%8%10%15%25%
2331
16th to endDay
6%437%6%5%7%7%9%12%28%
2276
August1st to 15thDay
8%5%25%6%46%8%9%15%27%
2112
16th to endDay
11%5%26%5%45%5%7%10%35%
2100
September1st to 15thDay
9%5%36%6%36%6%7%12%34%
1898
16th to endDay
7%425%5%35%5%6%8%43%
1815
October1st to 15thDay
6%31332346%7%56%
1815
16th to endDay
9%2145%2234459%
1833
November1st to 15thDay
8%42231345%7%55%
1582
16th to endDay
8%314424447%53%
1620
December1st to 15thDay
10%6%34434347%46%
1620
16th to endDay
19%7%36%5%34345%36%
1728
January1st to 15thNight
11%6%24424346%46%
2213
16th to endNight
16%6%34424336%43%
2304
February1st to 15thNight
13%5%13323346%51%
2103
16th to endNight
15%6%24423435%46%
1893
March1st to 15thNight
10%5%25%334447%47%
2160
16th to endNight
9%414424347%52%
2036
April1st to 15thNight
9%4233235%5%7%49%
1797
16th to endNight
7%413213347%59%
1800
May1st to 15thNight
8%31341445%9%53%
1745
16th to endNight
5%3144336%6%10%51%
1682
June1st to 15thNight
6%42442447%14%44%
1620
16th to endNight
5%223336%6%10%13%41%
1620
July1st to 15thNight
42135%27%7%9%14%39%
1626
16th to endNight
4225%5%47%7%8%14%37%
1892
August1st to 15thNight
42145%45%5%10%15%39%
1762
16th to endNight
8%435%5%446%6%11%38%
1750
September1st to 15thNight
8%5%25%5%35%5%9%11%36%
1719
16th to endNight
7%425%4345%6%9%46%
1815
October1st to 15thNight
431432345%8%57%
1815
16th to endNight
8%423423435%57%
2034
November1st to 15thNight
8%5%14323347%55%
2276
16th to endNight
10%324422446%54%
2340
December1st to 15thNight
10%5%35%424347%47%
2340
16th to endNight
16%7%25%5%3445%6%39%
2496

Transparency (when cloud cover <= 30%)
Color Meanings:
Too cloudy to forecast Poor Below Average Average Above average Transparent
MonthDays in MonthOccurrence of each ForecastData
Points
January1st to 15thDay
36%49%17%23%7%
1723
16th to endDay
41%5%6%15%21%8%
1920
February1st to 15thDay
35%410%17%22%9%
1752
16th to endDay
34%6%9%18%21%8%
1580
March1st to 15thDay
35%5%10%22%20%6%
1800
16th to endDay
34%5%13%20%18%8%
2195
April1st to 15thDay
34%5%10%22%20%7%
2151
16th to endDay
26%6%14%25%19%7%
2160
May1st to 15thDay
28%6%15%22%18%7%
2202
16th to endDay
28%8%17%25%16%2
2435
June1st to 15thDay
32%11%19%27%7%
2340
16th to endDay
34%11%21%21%9%1
2340
July1st to 15thDay
39%17%23%15%3
2192
16th to endDay
39%15%25%16%3
2133
August1st to 15thDay
37%16%23%16%5%
2100
16th to endDay
39%11%22%17%7%2
2100
September1st to 15thDay
37%12%19%17%9%2
1898
16th to endDay
33%9%14%18%17%6%
1815
October1st to 15thDay
24%5%13%19%22%14%
1815
16th to endDay
28%36%15%27%18%
1833
November1st to 15thDay
28%48%20%26%10%
1582
16th to endDay
29%5%8%20%21%14%
1620
December1st to 15thDay
36%6%11%21%19%5%
1620
16th to endDay
49%48%19%13%4
1728
January1st to 15thNight
38%5%8%13%25%8%
2213
16th to endNight
43%37%14%22%9%
2304
February1st to 15thNight
34%46%18%23%12%
2112
16th to endNight
40%5%7%13%21%12%
1893
March1st to 15thNight
35%5%12%19%21%6%
2160
16th to endNight
31%49%24%19%10%
2036
April1st to 15thNight
31%5%13%17%23%9%
1797
16th to endNight
25%411%30%21%7%
1800
May1st to 15thNight
27%415%21%21%7%
1746
16th to endNight
26%8%18%23%19%3
1684
June1st to 15thNight
28%9%25%22%12%1
1620
16th to endNight
28%12%23%24%10%
1620
July1st to 15thNight
28%15%31%19%5%
1536
16th to endNight
31%15%30%18%4
1772
August1st to 15thNight
29%12%33%20%3
1750
16th to endNight
37%12%22%18%6%2
1750
September1st to 15thNight
36%10%21%17%11%2
1719
16th to endNight
33%8%14%19%17%6%
1815
October1st to 15thNight
24%5%8%23%21%15%
1815
16th to endNight
30%46%13%25%19%
2034
November1st to 15thNight
30%36%20%27%12%
2276
16th to endNight
31%47%18%22%16%
2340
December1st to 15thNight
37%49%21%20%5%
2340
16th to endNight
44%49%19%15%5%
2496

Seeing (when cloud cover <= 80%)
Color Meanings:
Too cloudy to forecast Bad 1/5 Poor 2/5 Average 3/5 Good 4/5 Excellent 5/5
MonthDays in MonthOccurrence of each ForecastData
Points
January1st to 15thDay
12%428%31%21%2
90
16th to endDay
16%9%32%32%8%1
96
February1st to 15thDay
10%10%28%26%23%1
90
16th to endDay
9%233%37%17%
81
March1st to 15thDay
18%431%35%10%
90
16th to endDay
14%12%17%29%22%2
281
April1st to 15thDay
14%12%20%28%21%2
270
16th to endDay
414%12%30%31%5%
270
May1st to 15thDay
6%13%11%29%33%5%
288
16th to endDay
8%10%5%23%35%15%
331
June1st to 15thDay
12%10%113%38%23%
315
16th to endDay
11%9%211%33%31%
315
July1st to 15thDay
5%7%6%31%47%
305
16th to endDay
7%9%28%33%38%
326
August1st to 15thDay
11%6%28%35%36%
297
16th to endDay
8%6%28%35%38%
268
September1st to 15thDay
12%7%310%37%28%
255
16th to endDay
10%6%5%24%38%14%
254
October1st to 15thDay
7%6%10%30%34%10%
255
16th to endDay
10%6%13%27%30%11%
187
November1st to 15thDay
21%18%31%32%5%
90
16th to endDay
10%126%34%21%6%
90
December1st to 15thDay
10%427%40%16%1
90
16th to endDay
28%7%21%17%25%
96
January1st to 15thNight
13%23%26%24%9%1
720
16th to endNight
13%23%24%24%12%
768
February1st to 15thNight
13%22%21%27%13%1
704
16th to endNight
14%19%26%26%11%
631
March1st to 15thNight
12%21%23%28%14%1
720
16th to endNight
10%21%16%27%20%3
686
April1st to 15thNight
10%18%16%29%23%1
539
16th to endNight
7%17%14%24%30%5%
540
May1st to 15thNight
8%18%10%27%30%4
540
16th to endNight
7%17%6%16%39%13%
563
June1st to 15thNight
7%17%212%41%18%
540
16th to endNight
5%17%37%38%28%
540
July1st to 15thNight
411%1436%41%
510
16th to endNight
317%15%37%34%
564
August1st to 15thNight
5%10%15%40%36%
527
16th to endNight
10%10%38%39%27%
525
September1st to 15thNight
10%9%410%38%25%
564
16th to endNight
10%9%6%22%39%11%
657
October1st to 15thNight
7%10%10%31%33%7%
660
16th to endNight
9%12%15%25%29%6%
704
November1st to 15thNight
10%18%16%30%20%5%
700
16th to endNight
10%19%19%28%17%3
720
December1st to 15thNight
10%22%20%24%18%4
720
16th to endNight
17%22%19%26%14%
768
Page generated at 2017-08-13 13:16:25. Version ac04

Copyright 2017 A. Danko


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