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 2018-04-23.

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%
16763
21%
49515
16%
16722
63%
16722
30%
31019

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
43%
778
20%
2522
13%
776
52%
776
25%
1562
January16th to endNight
42%
832
24%
2623
17%
832
51%
832
26%
1622
February1st to 15thNight
44%
761
23%
2283
16%
758
53%
758
33%
1377
February16th to endNight
43%
683
26%
2000
15%
683
54%
683
34%
1172
March1st to 15thNight
44%
780
29%
2145
15%
780
56%
780
40%
1216
March16th to endNight
50%
832
27%
2288
19%
832
57%
832
41%
1296
April1st to 15thNight
55%
778
24%
2141
17%
778
60%
778
41%
1213
April16th to endNight
55%
743
27%
1923
16%
743
62%
743
42%
1127
May1st to 15thNight
69%
542
26%
1622
20%
542
74%
542
41%
909
May16th to endNight
72%
561
23%
1682
18%
561
74%
561
35%
1014
June1st to 15thNight
68%
540
12%
1620
11%
540
69%
540
24%
1133
June16th to endNight
72%
540
8%
1620
7%
540
73%
540
22%
1161
July1st to 15thNight
75%
510
6%
1530
5%
510
75%
510
20%
1160
July16th to endNight
74%
564
5%
1595
5%
531
76%
531
19%
1194
August1st to 15thNight
77%
539
5%
1633
6%
536
77%
536
22%
1157
August16th to endNight
68%
703
9%
2040
10%
703
68%
703
20%
1454
September1st to 15thNight
64%
720
8%
1980
7%
720
64%
720
18%
1474
September16th to endNight
60%
717
15%
1980
14%
717
61%
717
22%
1415
October1st to 15thNight
66%
720
25%
2030
24%
720
68%
720
33%
1265
October16th to endNight
58%
768
30%
2304
26%
768
65%
768
34%
1364
November1st to 15thNight
58%
760
29%
2281
24%
760
66%
760
40%
1258
November16th to endNight
49%
780
30%
2434
23%
780
60%
780
33%
1405
December1st to 15thNight
49%
780
26%
2535
22%
780
58%
780
30%
1488
December16th to endNight
53%
832
25%
2704
23%
832
60%
832
31%
1583

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%38%
49982
Night
7%425%5%345%6%9%44%
49724
TransparencyDay
42%8%13%16%13%6%
49683
Night
34%8%15%19%14%6%
49527
SeeingDay
9%415%22%24%23%
6522
Night
9%320%32%25%8%
16771

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
12%6%345%25%5%5%7%41%
1746
16th to endDay
9%6%34425%447%46%
1950
February1st to 15thDay
11%5%35%3245%5%7%44%
1900
16th to endDay
8%425%5%34346%51%
1756
March1st to 15thDay
5%324425%447%54%
2145
16th to endDay
8%426%5%24446%50%
2287
April1st to 15thDay
6%325%6%45%5%6%7%47%
2137
16th to endDay
5%3245%36%5%6%7%47%
2158
May1st to 15thDay
5%325%5%45%5%5%8%49%
2331
16th to endDay
7%325%8%5%7%6%6%7%37%
2431
June1st to 15thDay
12%6%38%8%5%7%7%6%10%23%
2340
16th to endDay
8%6%49%8%5%9%8%8%9%21%
2340
July1st to 15thDay
9%5%39%10%5%9%9%7%8%21%
2340
16th to endDay
7%6%39%10%6%9%8%7%10%20%
2465
August1st to 15thDay
8%6%38%9%6%8%8%8%10%21%
2313
16th to endDay
10%6%49%8%5%7%6%8%10%22%
2148
September1st to 15thDay
9%7%38%9%6%7%6%7%8%22%
1980
16th to endDay
10%6%310%9%5%6%7%6%9%25%
1980
October1st to 15thDay
8%436%7%46%6%6%7%38%
1929
16th to endDay
9%5%25%43436%8%47%
1920
November1st to 15thDay
6%42442446%5%54%
1907
16th to endDay
8%5%2442446%7%47%
1852
December1st to 15thDay
9%5%35%6%25%46%7%43%
1755
16th to endDay
6%425%6%346%5%8%46%
1872
January1st to 15thNight
9%7%36%5%2445%9%41%
2522
16th to endNight
11%5%24425%5%5%8%43%
2623
February1st to 15thNight
10%5%2342435%7%49%
2283
16th to endNight
7%5%26%5%23347%51%
2000
March1st to 15thNight
6%32442335%7%55%
2145
16th to endNight
6%32432345%7%55%
2288
April1st to 15thNight
6%31332346%10%53%
2141
16th to endNight
6%31342445%7%54%
1923
May1st to 15thNight
421343345%9%56%
1622
16th to endNight
44145%345%6%10%48%
1682
June1st to 15thNight
10%4346%35%6%7%10%35%
1620
16th to endNight
7%5%26%6%36%9%8%12%31%
1620
July1st to 15thNight
6%5%36%5%47%7%9%11%31%
1620
16th to endNight
4426%8%5%7%9%9%12%29%
1703
August1st to 15thNight
3437%6%5%6%6%7%15%32%
1644
16th to endNight
7%5%36%6%45%6%8%12%32%
2040
September1st to 15thNight
8%5%36%7%5%5%7%9%12%29%
1980
16th to endNight
9%6%37%7%45%5%7%9%33%
1980
October1st to 15thNight
6%5%245%25%5%7%8%46%
2030
16th to endNight
8%5%25%324347%51%
2304
November1st to 15thNight
5%31442345%6%56%
2281
16th to endNight
7%425%434446%51%
2434
December1st to 15thNight
9%425%5%345%47%48%
2535
16th to endNight
7%435%425%5%5%9%45%
2704

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
41%5%8%19%18%6%
1747
16th to endDay
37%48%16%23%9%
1950
February1st to 15thDay
38%5%8%13%19%13%
1902
16th to endDay
34%5%9%16%22%11%
1756
March1st to 15thDay
29%5%10%22%21%10%
2145
16th to endDay
34%49%20%20%9%
2288
April1st to 15thDay
34%6%10%19%20%7%
2137
16th to endDay
34%6%10%18%21%8%
2158
May1st to 15thDay
32%7%12%20%18%8%
2331
16th to endDay
43%7%13%18%14%2
2435
June1st to 15thDay
55%9%14%16%4
2340
16th to endDay
55%11%19%10%2
2340
July1st to 15thDay
57%13%19%8%
2201
16th to endDay
54%15%18%9%1
2310
August1st to 15thDay
51%15%25%7%
2300
16th to endDay
54%14%18%10%1
2148
September1st to 15thDay
54%14%17%10%3
1980
16th to endDay
52%9%16%14%6%2
1980
October1st to 15thDay
42%8%10%15%13%8%
1929
16th to endDay
35%5%9%15%21%13%
1920
November1st to 15thDay
30%48%23%22%10%
1907
16th to endDay
35%5%8%20%17%12%
1852
December1st to 15thDay
39%5%11%20%15%7%
1755
16th to endDay
35%6%11%21%17%7%
1872
January1st to 15thNight
39%5%11%19%16%6%
2522
16th to endNight
38%5%9%17%19%9%
2623
February1st to 15thNight
33%6%9%17%19%13%
2292
16th to endNight
32%5%12%17%25%6%
2000
March1st to 15thNight
27%411%25%21%9%
2145
16th to endNight
26%5%12%26%19%9%
2288
April1st to 15thNight
25%6%16%24%19%6%
2141
16th to endNight
26%6%14%23%21%7%
1923
May1st to 15thNight
24%7%16%24%18%8%
1623
16th to endNight
29%9%17%23%17%2
1684
June1st to 15thNight
40%12%21%20%5%
1620
16th to endNight
41%14%23%17%3
1620
July1st to 15thNight
42%18%27%10%1
1530
16th to endNight
40%19%28%10%1
1595
August1st to 15thNight
36%18%34%9%
1633
16th to endNight
40%16%25%15%1
2040
September1st to 15thNight
44%16%22%13%3
1980
16th to endNight
44%11%19%17%5%2
1980
October1st to 15thNight
32%8%13%20%18%6%
2030
16th to endNight
32%5%8%16%24%11%
2304
November1st to 15thNight
27%411%23%23%8%
2281
16th to endNight
32%5%9%21%19%11%
2434
December1st to 15thNight
35%412%24%15%8%
2535
16th to endNight
33%6%13%24%14%7%
2704

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%13%39%20%9%1
135
16th to endDay
9%15%40%22%10%
144
February1st to 15thDay
11%12%22%31%14%6%
135
16th to endDay
9%6%28%31%21%3
166
March1st to 15thDay
6%10%32%29%18%1
330
16th to endDay
10%8%24%31%20%3
352
April1st to 15thDay
6%7%23%28%26%6%
330
16th to endDay
6%416%27%32%12%
289
May1st to 15thDay
7%213%30%25%19%
288
16th to endDay
8%27%18%34%28%
331
June1st to 15thDay
17%16%12%27%34%
315
16th to endDay
8%39%24%53%
315
July1st to 15thDay
7%25%20%63%
305
16th to endDay
8%25%13%21%49%
326
August1st to 15thDay
11%38%24%50%
313
16th to endDay
12%312%23%46%
332
September1st to 15thDay
10%5%14%28%39%
315
16th to endDay
9%6%15%30%37%
314
October1st to 15thDay
9%312%30%30%12%
315
16th to endDay
10%5%22%30%24%7%
336
November1st to 15thDay
7%116%35%30%9%
325
16th to endDay
10%324%35%21%4
232
December1st to 15thDay
7%8%37%27%16%2
135
16th to endDay
6%418%43%21%5%
144
January1st to 15thNight
12%9%27%36%13%
780
16th to endNight
13%8%31%34%11%
832
February1st to 15thNight
13%5%31%36%12%
764
16th to endNight
8%7%32%39%11%
683
March1st to 15thNight
7%8%36%35%12%
780
16th to endNight
7%432%40%13%
832
April1st to 15thNight
7%5%26%42%16%
778
16th to endNight
7%425%41%19%
743
May1st to 15thNight
5%117%46%24%4
543
16th to endNight
5%111%39%35%6%
563
June1st to 15thNight
12%16%27%37%15%
540
16th to endNight
9%314%42%29%
540
July1st to 15thNight
7%210%44%34%
510
16th to endNight
4214%46%32%
564
August1st to 15thNight
3128%51%33%
539
16th to endNight
10%5%17%38%26%
703
September1st to 15thNight
11%6%23%37%19%
720
16th to endNight
12%8%27%39%11%
717
October1st to 15thNight
9%112%39%31%4
720
16th to endNight
10%321%35%26%2
768
November1st to 15thNight
7%324%39%22%3
760
16th to endNight
9%329%40%16%
780
December1st to 15thNight
8%6%30%33%20%1
780
16th to endNight
8%5%25%38%20%1
832
Page generated at 2018-04-24 10:02:59. Version ac04

Copyright 2018 A. Danko


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