Gainesville (FL)
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Gainesville (FL) clear sky chart from 2005-11-05 to 2017-12-20.

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
54%
16197
22%
48071
16%
16159
61%
16159
31%
29496

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
38%
716
21%
2327
13%
716
48%
716
24%
1437
January16th to endNight
37%
768
23%
2445
15%
768
49%
768
25%
1508
February1st to 15thNight
40%
701
26%
2106
15%
699
51%
699
31%
1257
February16th to endNight
37%
631
24%
1871
13%
631
48%
631
28%
1143
March1st to 15thNight
40%
720
28%
1980
14%
720
51%
720
37%
1150
March16th to endNight
45%
768
26%
2112
15%
768
54%
768
40%
1207
April1st to 15thNight
46%
718
24%
1976
15%
718
54%
718
37%
1153
April16th to endNight
51%
672
28%
1806
16%
672
59%
672
41%
1032
May1st to 15thNight
64%
539
27%
1619
18%
539
71%
539
43%
879
May16th to endNight
71%
561
24%
1682
17%
561
75%
561
40%
948
June1st to 15thNight
66%
540
13%
1620
10%
540
68%
540
27%
1075
June16th to endNight
75%
540
11%
1620
10%
540
75%
540
29%
1057
July1st to 15thNight
75%
510
10%
1530
9%
510
75%
510
25%
1041
July16th to endNight
76%
564
8%
1595
8%
531
78%
531
24%
1106
August1st to 15thNight
75%
539
7%
1612
7%
536
76%
536
24%
1117
August16th to endNight
66%
677
12%
2014
12%
677
66%
677
22%
1403
September1st to 15thNight
63%
720
10%
1980
9%
720
63%
720
21%
1420
September16th to endNight
59%
717
18%
1980
16%
717
61%
717
24%
1388
October1st to 15thNight
62%
720
27%
2031
24%
720
66%
720
35%
1219
October16th to endNight
55%
768
32%
2304
27%
768
65%
768
35%
1322
November1st to 15thNight
54%
760
30%
2281
22%
760
66%
760
41%
1222
November16th to endNight
45%
780
30%
2486
21%
780
60%
780
34%
1399
December1st to 15thNight
46%
780
27%
2535
22%
780
55%
780
29%
1488
December16th to endNight
48%
788
24%
2559
20%
788
57%
788
28%
1525

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
10%5%26%6%46%5%6%8%37%
48756
Night
8%4245%345%6%9%45%
48277
TransparencyDay
41%6%13%17%13%6%
48457
Night
34%6%15%20%15%7%
48080
SeeingDay
10%416%23%25%20%
6029
Night
10%5%20%31%25%6%
16207

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
13%6%25%5%2345%7%42%
1611
16th to endDay
14%5%36%42425%6%44%
1779
February1st to 15thDay
16%5%24423346%46%
1750
16th to endDay
12%5%24423445%48%
1601
March1st to 15thDay
9%315%42335%8%51%
1980
16th to endDay
10%4245%2445%6%49%
2111
April1st to 15thDay
8%415%6%3445%8%46%
1972
16th to endDay
6%4245%25%5%5%7%48%
2161
May1st to 15thDay
6%325%5%35%46%9%46%
2331
16th to endDay
7%435%6%5%6%6%6%8%38%
2431
June1st to 15thDay
9%5%37%8%5%7%7%7%10%27%
2340
16th to endDay
8%5%47%8%5%7%7%8%10%25%
2340
July1st to 15thDay
8%5%38%8%5%9%8%8%10%23%
2340
16th to endDay
8%6%38%9%6%9%9%8%9%21%
2465
August1st to 15thDay
10%5%27%8%6%8%10%10%9%18%
2334
16th to endDay
12%6%38%10%6%7%7%8%9%20%
2175
September1st to 15thDay
12%7%28%8%5%7%8%8%8%23%
1980
16th to endDay
12%7%38%8%5%7%6%6%7%27%
1980
October1st to 15thDay
9%5%26%8%35%5%46%41%
1929
16th to endDay
9%424325%5%5%6%50%
1920
November1st to 15thDay
7%424424448%51%
1907
16th to endDay
10%425%424346%49%
1800
December1st to 15thDay
11%7%25%43445%7%44%
1755
16th to endDay
11%6%25%5%245%6%8%41%
1764
January1st to 15thNight
12%6%35%434447%43%
2327
16th to endNight
15%5%24424446%44%
2445
February1st to 15thNight
11%424423335%51%
2103
16th to endNight
11%6%245%24337%47%
1871
March1st to 15thNight
8%43442335%8%51%
1980
16th to endNight
7%42431445%7%55%
2112
April1st to 15thNight
7%42342445%7%53%
1976
16th to endNight
6%3134245%6%8%53%
1806
May1st to 15thNight
4313325%5%5%9%56%
1619
16th to endNight
5%3144245%6%9%52%
1682
June1st to 15thNight
10%435%6%36%7%8%12%33%
1620
16th to endNight
6%425%5%36%6%7%15%37%
1620
July1st to 15thNight
5%325%6%37%7%10%13%34%
1620
16th to endNight
4435%8%49%7%9%12%32%
1703
August1st to 15thNight
6%325%6%46%8%10%12%32%
1623
16th to endNight
7%7%37%6%35%6%7%10%34%
2014
September1st to 15thNight
9%5%27%6%36%8%8%11%30%
1980
16th to endNight
11%6%36%6%36%5%7%10%32%
1980
October1st to 15thNight
8%4244345%5%8%49%
2031
16th to endNight
7%5%24333346%53%
2304
November1st to 15thNight
6%31342335%7%56%
2281
16th to endNight
7%5%24434447%51%
2486
December1st to 15thNight
11%4245%2435%8%46%
2535
16th to endNight
9%6%25%5%2445%7%45%
2559

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
40%48%18%17%10%
1612
16th to endDay
40%36%19%20%10%
1779
February1st to 15thDay
38%46%13%21%16%
1752
16th to endDay
37%410%12%22%12%
1601
March1st to 15thDay
31%38%22%22%11%
1980
16th to endDay
34%39%22%18%11%
2112
April1st to 15thDay
34%49%18%23%9%
1972
16th to endDay
33%5%8%22%19%10%
2161
May1st to 15thDay
32%411%22%19%8%
2331
16th to endDay
38%6%13%21%15%3
2435
June1st to 15thDay
49%7%18%17%7%
2340
16th to endDay
49%10%19%15%3
2340
July1st to 15thDay
50%10%24%13%1
2201
16th to endDay
51%12%21%11%2
2310
August1st to 15thDay
52%13%22%9%1
2321
16th to endDay
55%11%18%12%1
2175
September1st to 15thDay
52%11%19%10%5%
1980
16th to endDay
52%7%11%15%9%2
1980
October1st to 15thDay
43%5%7%16%16%10%
1929
16th to endDay
33%46%14%24%16%
1920
November1st to 15thDay
31%38%24%21%11%
1907
16th to endDay
34%37%18%24%11%
1800
December1st to 15thDay
39%311%22%15%7%
1755
16th to endDay
38%5%10%22%13%9%
1764
January1st to 15thNight
40%39%20%17%8%
2327
16th to endNight
40%38%14%23%10%
2445
February1st to 15thNight
35%27%16%21%16%
2112
16th to endNight
37%48%16%22%10%
1871
March1st to 15thNight
30%411%23%20%10%
1980
16th to endNight
27%412%22%21%10%
2112
April1st to 15thNight
29%5%11%20%24%8%
1976
16th to endNight
26%5%12%25%20%8%
1806
May1st to 15thNight
24%5%15%26%20%8%
1620
16th to endNight
27%6%17%27%18%2
1684
June1st to 15thNight
39%8%23%23%5%
1620
16th to endNight
34%11%26%21%5%
1620
July1st to 15thNight
35%14%30%16%2
1530
16th to endNight
36%15%30%12%4
1595
August1st to 15thNight
37%15%32%13%1
1612
16th to endNight
42%11%24%17%3
2014
September1st to 15thNight
42%13%24%13%5%
1980
16th to endNight
44%8%16%19%8%2
1980
October1st to 15thNight
31%7%11%19%20%9%
2031
16th to endNight
31%46%18%24%14%
2304
November1st to 15thNight
26%310%24%24%9%
2281
16th to endNight
32%38%20%20%14%
2486
December1st to 15thNight
36%311%25%14%8%
2535
16th to endNight
37%312%22%14%9%
2559

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
13%15%37%16%11%5%
90
16th to endDay
22%16%35%16%8%
96
February1st to 15thDay
5%30%31%17%14%1
90
16th to endDay
11%13%35%29%9%
102
March1st to 15thDay
13%11%28%29%12%4
270
16th to endDay
11%7%26%27%24%2
288
April1st to 15thDay
11%10%24%24%23%4
270
16th to endDay
8%421%28%24%13%
270
May1st to 15thDay
7%6%19%26%25%15%
288
16th to endDay
7%28%25%32%23%
331
June1st to 15thDay
14%16%19%30%27%
315
16th to endDay
8%417%31%36%
315
July1st to 15thDay
5%210%32%48%
305
16th to endDay
7%413%30%43%
326
August1st to 15thDay
14%1412%23%44%
313
16th to endDay
12%315%28%40%
332
September1st to 15thDay
16%2417%30%28%
315
16th to endDay
17%1421%31%23%
314
October1st to 15thDay
11%117%32%28%8%
315
16th to endDay
9%5%26%31%22%5%
336
November1st to 15thDay
8%324%32%26%5%
325
16th to endDay
8%6%31%30%16%5%
180
December1st to 15thDay
8%14%36%26%10%2
135
16th to endDay
8%5%28%42%11%3
108
January1st to 15thNight
14%12%27%28%15%
720
16th to endNight
17%11%28%33%8%
768
February1st to 15thNight
14%8%32%33%10%
704
16th to endNight
11%13%30%37%6%
631
March1st to 15thNight
11%10%33%33%11%
720
16th to endNight
9%8%31%33%16%
768
April1st to 15thNight
8%7%32%37%12%1
718
16th to endNight
7%6%27%37%18%2
672
May1st to 15thNight
4222%45%21%2
540
16th to endNight
6%112%37%33%6%
563
June1st to 15thNight
12%27%28%37%11%
540
16th to endNight
8%1321%43%21%
540
July1st to 15thNight
6%1315%46%27%
510
16th to endNight
3218%53%21%
564
August1st to 15thNight
6%315%50%23%
539
16th to endNight
10%25%20%43%16%
677
September1st to 15thNight
11%16%26%40%12%
720
16th to endNight
13%29%31%35%7%
717
October1st to 15thNight
10%117%38%28%3
720
16th to endNight
8%5%22%38%24%1
768
November1st to 15thNight
7%5%27%35%21%2
760
16th to endNight
10%333%33%17%1
780
December1st to 15thNight
11%8%27%35%16%
780
16th to endNight
12%9%23%36%17%1
788
Page generated at 2017-12-21 07:04:52. Version ac04

Copyright 2017 A. Danko


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