Withlacoochee River Park
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Withlacoochee River Park clear sky chart from 2005-11-05 to 2017-03-22.

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
57%
15302
20%
45222
16%
15261
62%
15261
29%
28464

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
44%
718
19%
2327
14%
716
52%
716
25%
1445
January16th to endNight
43%
768
23%
2421
17%
768
51%
768
26%
1502
February1st to 15thNight
43%
701
25%
2103
17%
698
53%
698
33%
1253
February16th to endNight
40%
631
24%
1848
13%
631
51%
631
32%
1104
March1st to 15thNight
44%
720
30%
1980
15%
720
56%
720
39%
1125
March16th to endNight
48%
732
25%
2013
17%
732
54%
732
39%
1169
April1st to 15thNight
54%
658
24%
1811
17%
658
60%
658
40%
1036
April16th to endNight
55%
660
25%
1708
15%
660
61%
660
41%
1009
May1st to 15thNight
69%
497
27%
1487
21%
497
74%
497
41%
835
May16th to endNight
72%
513
21%
1538
17%
513
74%
513
34%
942
June1st to 15thNight
71%
495
13%
1485
12%
495
72%
495
26%
1009
June16th to endNight
73%
495
8%
1485
7%
495
74%
495
22%
1047
July1st to 15thNight
74%
465
6%
1395
6%
465
74%
465
20%
1059
July16th to endNight
75%
522
6%
1469
6%
489
77%
489
20%
1095
August1st to 15thNight
78%
494
5%
1496
6%
491
78%
491
23%
1052
August16th to endNight
68%
644
9%
1869
10%
644
68%
644
20%
1333
September1st to 15thNight
65%
660
8%
1815
8%
660
65%
660
19%
1340
September16th to endNight
57%
657
13%
1815
12%
657
58%
657
20%
1331
October1st to 15thNight
66%
660
25%
1861
24%
660
69%
660
34%
1152
October16th to endNight
57%
704
28%
2112
24%
704
65%
704
33%
1265
November1st to 15thNight
56%
700
30%
2101
24%
700
65%
700
38%
1183
November16th to endNight
48%
720
28%
2247
22%
720
59%
720
33%
1309
December1st to 15thNight
47%
720
26%
2340
22%
720
56%
720
29%
1388
December16th to endNight
52%
768
23%
2496
21%
768
58%
768
30%
1481

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
8%5%36%6%46%6%6%8%37%
45642
Night
7%425%5%345%6%9%44%
45431
TransparencyDay
42%8%13%15%13%6%
45343
Night
34%8%15%19%14%6%
45234
SeeingDay
10%313%21%24%26%
5047
Night
9%420%32%25%8%
15310

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%6%245%25%5%5%8%42%
1611
16th to endDay
10%6%34425%447%46%
1800
February1st to 15thDay
12%5%35%3245%5%6%45%
1750
16th to endDay
9%426%5%34446%50%
1622
March1st to 15thDay
6%424425%5%47%52%
1980
16th to endDay
8%436%5%34446%48%
2007
April1st to 15thDay
7%425%6%45%5%6%7%46%
1807
16th to endDay
6%4245%36%5%6%7%46%
1927
May1st to 15thDay
5%325%5%45%5%5%8%48%
2136
16th to endDay
8%326%8%5%7%6%6%7%36%
2223
June1st to 15thDay
11%5%37%8%5%7%7%6%10%25%
2145
16th to endDay
8%6%49%8%5%9%8%8%9%21%
2145
July1st to 15thDay
10%6%39%9%5%9%9%7%8%20%
2145
16th to endDay
7%6%39%10%6%9%8%7%10%21%
2283
August1st to 15thDay
8%6%38%9%6%8%8%8%10%20%
2120
16th to endDay
10%7%48%8%47%6%8%10%21%
1968
September1st to 15thDay
9%7%38%9%6%7%6%7%8%23%
1815
16th to endDay
10%6%310%9%6%6%7%6%10%24%
1815
October1st to 15thDay
8%425%7%46%6%6%7%39%
1768
16th to endDay
9%5%25%43445%8%47%
1760
November1st to 15thDay
6%42442446%5%53%
1757
16th to endDay
8%5%245%3446%7%46%
1710
December1st to 15thDay
9%5%36%6%25%45%7%42%
1620
16th to endDay
7%425%6%346%5%8%45%
1728
January1st to 15thNight
10%7%26%5%245%5%9%40%
2327
16th to endNight
12%6%24425%5%5%8%43%
2421
February1st to 15thNight
10%6%23323347%50%
2103
16th to endNight
8%5%26%5%23348%49%
1848
March1st to 15thNight
6%32342335%7%55%
1980
16th to endNight
6%325%42345%7%53%
2013
April1st to 15thNight
6%31432345%10%52%
1811
16th to endNight
7%31342445%7%54%
1708
May1st to 15thNight
5%21343345%10%55%
1487
16th to endNight
44145%35%5%6%10%47%
1538
June1st to 15thNight
9%4345%45%6%8%10%37%
1485
16th to endNight
7%425%6%36%9%8%12%33%
1485
July1st to 15thNight
7%5%36%5%37%7%9%11%31%
1485
16th to endNight
4426%8%5%7%9%9%12%29%
1577
August1st to 15thNight
35%27%6%5%6%6%7%15%32%
1507
16th to endNight
6%5%36%6%45%6%8%12%32%
1869
September1st to 15thNight
7%5%36%6%45%7%8%12%30%
1815
16th to endNight
10%6%37%7%45%5%7%10%30%
1815
October1st to 15thNight
6%5%245%245%8%8%46%
1861
16th to endNight
9%425%324347%50%
2112
November1st to 15thNight
6%42442345%7%54%
2101
16th to endNight
7%425%5%34446%50%
2247
December1st to 15thNight
9%425%5%245%47%46%
2340
16th to endNight
8%435%426%5%5%9%44%
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
40%5%9%19%18%7%
1612
16th to endDay
37%48%15%24%9%
1800
February1st to 15thDay
38%5%7%13%20%15%
1752
16th to endDay
36%49%15%21%11%
1622
March1st to 15thDay
30%5%10%23%21%9%
1980
16th to endDay
36%5%10%18%19%10%
2008
April1st to 15thDay
36%6%10%19%19%7%
1807
16th to endDay
34%6%10%17%21%8%
1927
May1st to 15thDay
33%7%12%21%17%8%
2136
16th to endDay
44%7%13%18%13%1
2227
June1st to 15thDay
52%9%15%17%4
2145
16th to endDay
55%11%19%11%2
2145
July1st to 15thDay
58%13%17%8%
2006
16th to endDay
54%15%18%10%1
2128
August1st to 15thDay
51%15%25%6%
2107
16th to endDay
54%15%19%10%1
1968
September1st to 15thDay
54%14%17%10%3
1815
16th to endDay
53%9%15%13%5%2
1815
October1st to 15thDay
41%8%10%15%14%9%
1768
16th to endDay
36%5%9%15%21%12%
1760
November1st to 15thDay
30%48%23%22%10%
1757
16th to endDay
35%5%9%19%16%13%
1710
December1st to 15thDay
40%5%11%18%16%6%
1620
16th to endDay
36%6%11%20%17%8%
1728
January1st to 15thNight
40%5%12%19%16%6%
2327
16th to endNight
38%6%10%17%18%9%
2421
February1st to 15thNight
32%5%7%18%21%14%
2112
16th to endNight
33%5%13%17%23%7%
1848
March1st to 15thNight
27%5%11%27%20%7%
1980
16th to endNight
28%5%12%24%19%9%
2013
April1st to 15thNight
26%7%17%24%18%6%
1811
16th to endNight
27%6%15%21%21%7%
1708
May1st to 15thNight
24%8%17%25%17%7%
1488
16th to endNight
30%9%17%23%17%1
1540
June1st to 15thNight
37%12%22%21%6%
1485
16th to endNight
39%14%23%18%3
1485
July1st to 15thNight
43%17%27%10%1
1395
16th to endNight
39%19%27%11%1
1469
August1st to 15thNight
36%17%35%9%
1496
16th to endNight
40%16%25%15%1
1869
September1st to 15thNight
42%16%22%13%3
1815
16th to endNight
46%11%18%16%5%1
1815
October1st to 15thNight
32%8%13%19%18%7%
1861
16th to endNight
33%5%8%16%25%10%
2112
November1st to 15thNight
28%5%10%22%22%9%
2101
16th to endNight
33%5%9%21%17%12%
2247
December1st to 15thNight
36%411%24%15%7%
2340
16th to endNight
34%6%13%22%15%8%
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
16%11%33%24%12%2
90
16th to endDay
10%20%31%23%12%1
96
February1st to 15thDay
13%17%22%25%14%6%
90
16th to endDay
12%8%33%34%11%
123
March1st to 15thDay
7%8%30%31%19%2
270
16th to endDay
12%6%24%30%20%5%
250
April1st to 15thDay
8%7%22%26%25%9%
210
16th to endDay
9%316%23%32%14%
210
May1st to 15thDay
8%210%29%26%23%
228
16th to endDay
9%16%17%34%31%
267
June1st to 15thDay
12%15%12%29%39%
255
16th to endDay
8%28%23%56%
255
July1st to 15thDay
9%16%20%61%
245
16th to endDay
7%2411%23%51%
270
August1st to 15thDay
13%48%22%50%
253
16th to endDay
11%1210%22%51%
268
September1st to 15thDay
10%5%12%28%43%
255
16th to endDay
11%6%13%26%40%
254
October1st to 15thDay
10%310%29%32%13%
255
16th to endDay
10%221%28%27%8%
272
November1st to 15thDay
7%118%32%30%9%
265
16th to endDay
10%326%34%20%5%
180
December1st to 15thDay
6%6%38%33%14%
90
16th to endDay
9%415%44%22%3
96
January1st to 15thNight
13%9%26%35%14%
720
16th to endNight
13%8%30%34%11%
768
February1st to 15thNight
13%6%31%35%12%
704
16th to endNight
9%8%34%39%9%
631
March1st to 15thNight
7%8%36%35%12%
720
16th to endNight
8%5%32%39%13%1
732
April1st to 15thNight
7%5%27%43%15%
658
16th to endNight
8%425%42%18%
660
May1st to 15thNight
5%117%46%24%4
498
16th to endNight
5%111%40%35%6%
515
June1st to 15thNight
10%6%28%38%15%
495
16th to endNight
8%314%43%28%
495
July1st to 15thNight
8%211%44%32%
465
16th to endNight
3213%48%31%
522
August1st to 15thNight
3119%52%31%
494
16th to endNight
10%6%16%39%26%
644
September1st to 15thNight
10%6%23%37%20%
660
16th to endNight
13%8%27%38%11%
657
October1st to 15thNight
9%11%39%32%5%
660
16th to endNight
11%320%34%27%2
704
November1st to 15thNight
7%325%38%21%3
700
16th to endNight
9%329%40%15%
720
December1st to 15thNight
9%6%30%33%19%
720
16th to endNight
8%5%25%38%19%1
768
Page generated at 2017-03-23 07:36:14. Version ac04

Copyright 2017 A. Danko


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