Waycross
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Waycross clear sky chart from 2005-11-06 to 2024-01-12.

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%
24247
21%
74417
15%
24194
58%
24194
28%
46494

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 10thNight
31%
757
23%
2459
10%
757
47%
757
24%
1497
January11th to 20thNight
42%
728
26%
2365
17%
728
55%
728
30%
1355
January21st to endNight
26%
792
22%
2548
9%
792
41%
792
22%
1635
February1st to 10thNight
35%
720
21%
2160
12%
720
45%
720
25%
1379
February11th to 20thNight
35%
702
23%
2098
10%
699
49%
699
27%
1300
February21st to endNight
37%
592
26%
1764
15%
592
49%
592
29%
1069
March1st to 10thNight
41%
720
30%
1980
17%
720
52%
720
38%
1150
March11th to 20thNight
36%
720
24%
1980
12%
720
48%
720
30%
1247
March21st to endNight
40%
792
25%
2178
11%
792
51%
792
35%
1275
April1st to 10thNight
40%
720
24%
1980
15%
720
49%
720
34%
1204
April11th to 20thNight
43%
711
24%
1919
15%
711
49%
711
34%
1158
April21st to endNight
57%
590
34%
1670
22%
590
66%
590
44%
907
May1st to 10thNight
56%
540
28%
1620
18%
540
63%
540
40%
881
May11th to 20thNight
64%
531
19%
1593
14%
531
67%
531
32%
980
May21st to endNight
68%
582
21%
1744
17%
582
70%
582
30%
1089
June1st to 10thNight
65%
540
14%
1620
10%
540
67%
540
25%
1108
June11th to 20thNight
73%
540
15%
1620
11%
540
75%
540
28%
1047
June21st to endNight
71%
540
12%
1620
10%
540
73%
540
25%
1086
July1st to 10thNight
72%
525
10%
1575
9%
525
73%
525
23%
1107
July11th to 20thNight
69%
522
9%
1566
8%
522
70%
522
21%
1110
July21st to endNight
75%
591
11%
1672
11%
558
76%
558
28%
1100
August1st to 10thNight
70%
537
9%
1600
8%
534
70%
534
23%
1105
August11th to 20thNight
74%
534
11%
1634
11%
534
75%
534
24%
1158
August21st to endNight
61%
720
12%
2106
12%
720
62%
720
19%
1537
September1st to 10thNight
64%
720
14%
1980
13%
720
64%
720
22%
1414
September11th to 20thNight
58%
720
13%
1980
12%
720
59%
720
22%
1413
September21st to endNight
61%
720
22%
1980
20%
720
63%
720
29%
1289
October1st to 10thNight
56%
720
27%
1980
21%
720
63%
720
35%
1203
October11th to 20thNight
57%
720
31%
2160
28%
720
65%
720
37%
1221
October21st to endNight
52%
792
30%
2376
24%
792
61%
792
34%
1373
November1st to 10thNight
52%
740
27%
2221
22%
740
60%
740
34%
1303
November11th to 20thNight
44%
760
28%
2375
20%
760
57%
760
31%
1379
November21st to endNight
42%
760
26%
2470
19%
760
53%
760
28%
1453
December1st to 10thNight
43%
760
24%
2470
16%
760
55%
760
27%
1483
December11th to 20thNight
38%
759
25%
2925
17%
758
48%
758
22%
1739
December21st to endNight
38%
830
15%
4429
15%
817
48%
817
14%
2740

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%6%36%6%46%6%6%8%40%
74887
Night
10%6%35%5%35%5%6%8%44%
74845
TransparencyDay
40%8%12%18%16%6%
74610
Night
37%7%13%18%17%8%
74641
SeeingDay
12%8%22%24%22%12%
14151
Night
12%6%23%32%23%4
24260

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 10thDay
10%6%46%5%35%5%5%8%45%
1706
11th to 20thDay
10%5%25%5%245%5%8%49%
1635
21st to endDay
16%6%35%5%33446%45%
1804
February1st to 10thDay
16%7%35%6%35%5%46%41%
1800
11th to 20thDay
13%5%25%5%34345%51%
1748
21st to endDay
15%7%35%433445%47%
1490
March1st to 10thDay
10%42443445%6%53%
1980
11th to 20thDay
10%5%25%5%45%6%6%6%45%
1980
21st to endDay
11%5%25%43345%7%50%
2178
April1st to 10thDay
9%5%35%5%45%6%5%7%48%
1980
11th to 20thDay
12%5%25%6%35%5%5%7%44%
1987
21st to endDay
7%424425%5%5%8%54%
2304
May1st to 10thDay
6%4245%3445%10%54%
2340
11th to 20thDay
7%5%36%6%5%6%6%7%9%39%
2301
21st to endDay
9%5%36%8%46%7%6%9%37%
2531
June1st to 10thDay
10%5%36%8%5%7%6%7%11%32%
2340
11th to 20thDay
5%5%36%8%48%8%8%11%34%
2340
21st to endDay
7%5%37%7%5%8%8%9%11%30%
2340
July1st to 10thDay
7%5%37%9%5%8%9%9%11%28%
2340
11th to 20thDay
7%7%38%9%6%8%8%9%11%24%
2340
21st to endDay
7%5%48%9%6%8%8%8%10%29%
2547
August1st to 10thDay
9%6%27%10%6%7%9%9%10%23%
2327
11th to 20thDay
8%7%49%10%5%9%9%8%12%20%
2263
21st to endDay
12%8%47%8%6%9%7%8%9%22%
2232
September1st to 10thDay
10%6%38%8%5%8%8%8%9%27%
1980
11th to 20thDay
12%7%38%7%47%7%7%8%29%
1980
21st to endDay
12%6%37%7%46%6%5%8%37%
1980
October1st to 10thDay
11%7%26%5%45%45%6%44%
1979
11th to 20thDay
9%435%5%23447%54%
1800
21st to endDay
8%5%35%5%35%45%6%51%
1980
November1st to 10thDay
10%5%24425%346%53%
1857
11th to 20thDay
10%7%2442435%6%53%
1801
21st to endDay
13%6%25%43445%7%48%
1710
December1st to 10thDay
12%6%25%5%345%6%7%44%
1710
11th to 20thDay
16%6%25%42445%7%44%
2153
21st to endDay
16%9%36%5%33445%42%
3124
January1st to 10thNight
12%6%35%6%345%5%7%44%
2459
11th to 20thNight
10%5%24435%45%7%50%
2365
21st to endNight
15%6%47%5%3445%6%42%
2548
February1st to 10thNight
15%6%36%43445%6%43%
2160
11th to 20thNight
13%7%25%5%24346%49%
2098
21st to endNight
11%6%25%43445%8%47%
1764
March1st to 10thNight
9%6%2342345%8%54%
1980
11th to 20thNight
11%6%26%5%3445%7%48%
1980
21st to endNight
8%5%2442445%7%54%
2178
April1st to 10thNight
9%4244345%5%8%51%
1980
11th to 20thNight
8%5%35%6%345%5%7%50%
1919
21st to endNight
6%4244235%6%7%59%
1670
May1st to 10thNight
6%3234345%5%8%58%
1620
11th to 20thNight
6%425%5%45%6%8%10%46%
1592
21st to endNight
8%5%25%6%35%6%6%9%45%
1744
June1st to 10thNight
8%5%36%8%46%7%10%12%31%
1620
11th to 20thNight
5%425%7%5%6%7%8%12%40%
1620
21st to endNight
7%5%247%47%8%8%14%34%
1620
July1st to 10thNight
6%5%25%6%5%8%8%10%14%33%
1620
11th to 20thNight
5%6%36%8%5%8%8%9%13%29%
1620
21st to endNight
45%26%7%47%7%11%13%37%
1771
August1st to 10thNight
5%447%8%5%7%8%8%12%32%
1611
11th to 20thNight
5%5%36%7%5%6%9%10%14%30%
1634
21st to endNight
9%8%47%7%5%7%7%8%11%28%
2106
September1st to 10thNight
10%7%46%7%46%7%7%11%31%
1980
11th to 20thNight
11%7%36%8%36%6%7%10%33%
1980
21st to endNight
9%6%26%6%445%6%9%41%
1980
October1st to 10thNight
11%5%25%43445%7%50%
1980
11th to 20thNight
9%5%24434345%57%
2160
21st to endNight
8%5%25%5%25%45%7%52%
2376
November1st to 10thNight
10%5%25%424446%52%
2221
11th to 20thNight
11%6%25%434446%51%
2375
21st to endNight
13%6%3443345%7%47%
2470
December1st to 10thNight
12%6%35%5%3446%9%44%
2470
11th to 20thNight
16%7%35%423445%49%
3042
21st to endNight
15%8%36%6%4445%6%40%
4532

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 10thDay
38%5%9%19%20%9%
1707
11th to 20thDay
34%39%21%23%10%
1635
21st to endDay
42%36%18%22%9%
1804
February1st to 10thDay
45%48%15%18%10%
1800
11th to 20thDay
37%47%15%27%11%
1758
21st to endDay
40%47%18%18%13%
1490
March1st to 10thDay
31%47%20%25%12%
1980
11th to 20thDay
38%6%12%18%15%11%
1980
21st to endDay
34%5%11%21%20%9%
2178
April1st to 10thDay
36%6%8%19%19%12%
1980
11th to 20thDay
40%48%17%21%10%
1987
21st to endDay
28%5%9%26%22%9%
2304
May1st to 10thDay
27%6%9%24%25%8%
2340
11th to 20thDay
39%8%14%20%14%4
2305
21st to endDay
42%8%12%18%17%3
2531
June1st to 10thDay
44%8%16%18%12%1
2340
11th to 20thDay
39%12%17%22%10%
2340
21st to endDay
45%12%20%14%7%1
2340
July1st to 10thDay
44%15%22%15%31
2275
11th to 20thDay
48%14%20%13%5%1
2271
21st to endDay
44%12%21%19%4
2405
August1st to 10thDay
49%14%19%16%2
2314
11th to 20thDay
51%14%20%11%3
2263
21st to endDay
54%13%17%12%41
2232
September1st to 10thDay
49%12%14%14%10%2
1980
11th to 20thDay
49%10%12%17%9%2
1980
21st to endDay
44%7%12%15%17%5%
1980
October1st to 10thDay
39%7%9%16%19%10%
1979
11th to 20thDay
30%5%7%21%29%8%
1800
21st to endDay
33%5%6%17%22%16%
1980
November1st to 10thDay
33%49%16%23%14%
1857
11th to 20thDay
33%47%18%26%12%
1801
21st to endDay
36%48%19%23%9%
1710
December1st to 10thDay
38%6%11%19%18%8%
1710
11th to 20thDay
41%48%18%22%7%
2150
21st to endDay
46%45%17%22%6%
3124
January1st to 10thNight
39%5%8%17%22%9%
2459
11th to 20thNight
34%5%9%16%25%11%
2365
21st to endNight
43%5%7%14%20%11%
2548
February1st to 10thNight
41%5%7%17%19%11%
2160
11th to 20thNight
38%47%16%20%14%
2099
21st to endNight
36%5%9%21%16%14%
1764
March1st to 10thNight
30%410%21%21%14%
1980
11th to 20thNight
36%6%11%19%18%11%
1980
21st to endNight
30%5%13%21%20%10%
2178
April1st to 10thNight
32%6%12%19%19%13%
1980
11th to 20thNight
33%5%8%22%21%11%
1919
21st to endNight
24%5%12%27%23%8%
1670
May1st to 10thNight
24%7%11%26%22%10%
1620
11th to 20thNight
32%9%18%21%15%5%
1593
21st to endNight
34%9%12%26%16%3
1745
June1st to 10thNight
40%11%18%19%10%1
1620
11th to 20thNight
34%12%23%22%8%
1620
21st to endNight
36%13%26%17%6%1
1620
July1st to 10thNight
37%17%24%17%41
1575
11th to 20thNight
42%14%27%12%5%1
1566
21st to endNight
32%14%29%21%4
1672
August1st to 10thNight
40%13%28%16%3
1600
11th to 20thNight
38%16%27%16%31
1634
21st to endNight
46%12%22%15%41
2106
September1st to 10thNight
43%12%20%14%9%2
1980
11th to 20thNight
44%11%15%17%11%1
1980
21st to endNight
38%8%16%19%15%5%
1980
October1st to 10thNight
34%5%13%19%17%12%
1980
11th to 20thNight
30%47%22%28%8%
2160
21st to endNight
32%5%8%16%23%16%
2376
November1st to 10thNight
33%48%18%22%15%
2221
11th to 20thNight
35%38%16%25%13%
2375
21st to endNight
37%49%20%20%10%
2470
December1st to 10thNight
38%5%14%18%19%7%
2470
11th to 20thNight
39%47%17%23%9%
3044
21st to endNight
46%5%9%17%19%4
4532

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 10thDay
11%23%40%19%6%1
270
11th to 20thDay
11%17%37%22%9%3
245
21st to endDay
20%21%43%11%5%
264
February1st to 10thDay
20%17%38%18%6%1
240
11th to 20thDay
17%18%40%19%6%
240
21st to endDay
17%16%40%22%4
208
March1st to 10thDay
13%15%33%26%13%1
420
11th to 20thDay
15%14%35%23%11%2
420
21st to endDay
15%13%34%25%12%2
462
April1st to 10thDay
15%16%26%27%14%2
420
11th to 20thDay
13%12%30%25%14%6%
412
21st to endDay
8%7%26%30%19%9%
420
May1st to 10thDay
5%14%26%26%21%8%
423
11th to 20thDay
7%221%30%25%15%
447
21st to endDay
11%215%21%34%18%
485
June1st to 10thDay
12%213%28%27%19%
450
11th to 20thDay
9%311%24%29%24%
450
21st to endDay
8%310%25%32%22%
450
July1st to 10thDay
7%18%19%34%30%
445
11th to 20thDay
8%2418%34%35%
444
21st to endDay
7%27%22%38%24%
488
August1st to 10thDay
11%210%19%29%29%
446
11th to 20thDay
8%35%15%34%35%
439
21st to endDay
12%210%22%29%25%
495
September1st to 10thDay
11%311%20%32%22%
450
11th to 20thDay
14%215%28%30%12%
450
21st to endDay
14%112%27%33%14%
450
October1st to 10thDay
12%326%30%21%7%
450
11th to 20thDay
9%6%21%32%23%9%
450
21st to endDay
12%7%24%28%25%4
495
November1st to 10thDay
18%5%25%29%18%5%
455
11th to 20thDay
19%9%34%24%11%3
361
21st to endDay
14%12%32%32%9%2
270
December1st to 10thDay
16%13%35%25%10%2
270
11th to 20thDay
20%13%36%23%8%
270
21st to endDay
18%10%31%29%10%1
297
January1st to 10thNight
14%13%36%30%6%1
760
11th to 20thNight
14%9%31%35%11%1
728
21st to endNight
19%11%38%26%5%
792
February1st to 10thNight
18%11%32%31%8%
720
11th to 20thNight
16%13%31%35%5%
703
21st to endNight
16%9%34%36%4
592
March1st to 10thNight
12%11%32%38%8%
720
11th to 20thNight
14%9%36%30%12%1
720
21st to endNight
11%10%34%34%10%1
792
April1st to 10thNight
12%11%34%31%12%1
720
11th to 20thNight
10%9%32%35%13%1
711
21st to endNight
8%5%27%41%19%
590
May1st to 10thNight
8%427%44%16%1
540
11th to 20thNight
8%319%41%27%3
531
21st to endNight
9%212%33%40%5%
584
June1st to 10thNight
10%211%36%37%3
540
11th to 20thNight
7%19%34%36%11%
540
21st to endNight
8%19%31%42%9%
540
July1st to 10thNight
7%27%28%42%15%
525
11th to 20thNight
8%16%21%49%15%
522
21st to endNight
416%31%48%10%
591
August1st to 10thNight
6%16%29%45%13%
537
11th to 20thNight
6%1421%54%14%
534
21st to endNight
12%111%25%38%13%
720
September1st to 10thNight
11%210%27%41%9%
720
11th to 20thNight
13%212%33%34%5%
720
21st to endNight
14%213%31%36%4
720
October1st to 10thNight
13%320%34%26%4
720
11th to 20thNight
12%321%34%27%3
720
21st to endNight
9%5%25%34%25%1
792
November1st to 10thNight
12%5%25%38%20%1
740
11th to 20thNight
15%9%27%34%15%1
760
21st to endNight
15%8%29%34%13%
760
December1st to 10thNight
14%8%30%33%15%1
760
11th to 20thNight
17%9%29%31%14%1
760
21st to endNight
18%10%28%31%12%
836
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