Waycross
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Waycross clear sky chart from 2005-11-05 to 2017-09-19.

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
52%
15772
22%
46948
16%
15732
59%
15732
29%
29226

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
34%
716
21%
2327
11%
716
48%
716
23%
1430
January16th to endNight
35%
768
23%
2479
13%
768
47%
768
25%
1515
February1st to 15thNight
36%
703
24%
2107
12%
699
49%
699
27%
1303
February16th to endNight
36%
631
25%
1885
14%
631
49%
631
29%
1144
March1st to 15thNight
40%
720
27%
1980
14%
720
51%
720
36%
1171
March16th to endNight
44%
768
24%
2112
13%
768
53%
768
35%
1252
April1st to 15thNight
42%
718
25%
1976
16%
718
50%
718
35%
1192
April16th to endNight
54%
633
30%
1749
19%
633
61%
633
41%
972
May1st to 15thNight
57%
539
25%
1620
16%
539
63%
539
36%
936
May16th to endNight
70%
561
21%
1683
17%
561
72%
561
32%
1025
June1st to 15thNight
69%
540
13%
1620
10%
540
71%
540
24%
1102
June16th to endNight
73%
540
13%
1620
11%
540
74%
540
25%
1087
July1st to 15thNight
73%
510
12%
1530
10%
510
73%
510
26%
1019
July16th to endNight
73%
564
10%
1595
9%
531
74%
531
24%
1087
August1st to 15thNight
72%
539
12%
1609
11%
536
73%
536
23%
1139
August16th to endNight
64%
657
13%
1959
14%
657
64%
657
21%
1396
September1st to 15thNight
65%
720
13%
1980
12%
720
65%
720
23%
1391
September16th to endNight
56%
673
18%
1858
15%
673
58%
673
23%
1295
October1st to 15thNight
56%
660
29%
1870
24%
660
63%
660
36%
1114
October16th to endNight
55%
704
32%
2112
28%
704
63%
704
37%
1188
November1st to 15thNight
55%
700
31%
2101
25%
700
63%
700
37%
1187
November16th to endNight
43%
720
28%
2340
19%
720
56%
720
32%
1301
December1st to 15thNight
42%
720
23%
2340
17%
720
52%
720
26%
1414
December16th to endNight
42%
768
23%
2496
19%
768
51%
768
25%
1566

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%25%6%35%5%5%8%39%
47855
Night
9%5%245%345%6%8%44%
47151
TransparencyDay
41%7%11%17%15%6%
47556
Night
36%6%13%18%16%8%
46954
SeeingDay
12%5%17%22%25%17%
5632
Night
12%5%21%32%23%3
15780

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%35%4245%48%42%
1611
16th to endDay
14%5%25%5%23446%46%
1743
February1st to 15thDay
14%6%245%34445%45%
1750
16th to endDay
14%6%25%42223451%
1586
March1st to 15thDay
10%41442445%6%50%
1980
16th to endDay
10%5%245%44445%48%
2111
April1st to 15thDay
10%5%244345%46%47%
1972
16th to endDay
8%414426%5%5%8%47%
2218
May1st to 15thDay
6%4245%35%5%6%9%46%
2331
16th to endDay
8%5%35%7%46%6%5%8%38%
2431
June1st to 15thDay
9%425%7%47%6%7%11%32%
2340
16th to endDay
7%5%26%7%5%8%7%8%9%31%
2340
July1st to 15thDay
7%5%37%8%47%8%9%10%27%
2340
16th to endDay
7%5%38%8%6%9%7%8%10%24%
2465
August1st to 15thDay
9%7%27%10%6%8%8%8%10%19%
2340
16th to endDay
12%7%38%9%6%8%6%7%8%21%
2228
September1st to 15thDay
12%5%38%7%47%7%7%9%27%
1980
16th to endDay
15%6%38%6%46%6%5%8%27%
1848
October1st to 15thDay
14%6%24424347%45%
1759
16th to endDay
8%5%24424345%53%
1760
November1st to 15thDay
8%5%23324346%55%
1754
16th to endDay
10%5%24423335%52%
1620
December1st to 15thDay
13%6%35%43445%6%41%
1620
16th to endDay
13%8%25%5%3345%6%40%
1728
January1st to 15thNight
11%5%35%435%45%6%43%
2327
16th to endNight
12%5%36%423446%46%
2479
February1st to 15thNight
13%5%25%323345%48%
2103
16th to endNight
11%6%24434347%48%
1885
March1st to 15thNight
8%4234235%5%8%50%
1980
16th to endNight
9%424323346%55%
2112
April1st to 15thNight
8%424423447%52%
1976
16th to endNight
6%32332345%6%57%
1749
May1st to 15thNight
7%3234245%6%8%51%
1619
16th to endNight
6%3145%35%6%7%8%46%
1682
June1st to 15thNight
8%425%7%36%7%9%12%32%
1620
16th to endNight
7%5%246%46%8%8%13%33%
1620
July1st to 15thNight
5%5%25%6%37%7%9%13%33%
1620
16th to endNight
35%25%7%47%7%10%13%31%
1703
August1st to 15thNight
45%36%7%5%7%7%9%13%28%
1620
16th to endNight
9%6%26%6%46%7%9%11%29%
1959
September1st to 15thNight
10%5%35%6%35%7%7%11%32%
1980
16th to endNight
12%7%25%6%35%6%7%9%33%
1858
October1st to 15thNight
12%5%14423345%52%
1870
16th to endNight
8%424424336%56%
2112
November1st to 15thNight
9%324424346%54%
2101
16th to endNight
10%5%24423346%53%
2340
December1st to 15thNight
12%6%35%42335%7%44%
2340
16th to endNight
13%7%35%42435%7%43%
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%38%18%18%10%
1612
16th to endDay
39%36%18%20%11%
1743
February1st to 15thDay
41%45%13%22%12%
1752
16th to endDay
38%25%15%24%12%
1586
March1st to 15thDay
33%48%21%22%9%
1980
16th to endDay
38%5%9%17%19%9%
2112
April1st to 15thDay
37%5%6%18%22%9%
1972
16th to endDay
33%49%21%19%9%
2218
May1st to 15thDay
32%6%10%23%20%6%
2331
16th to endDay
41%7%12%20%15%3
2435
June1st to 15thDay
43%8%16%20%10%
2340
16th to endDay
45%11%17%16%8%1
2340
July1st to 15thDay
44%12%21%16%3
2201
16th to endDay
48%12%19%15%4
2310
August1st to 15thDay
51%14%18%11%3
2327
16th to endDay
55%11%14%12%3
2228
September1st to 15thDay
49%11%12%14%10%1
1980
16th to endDay
52%8%10%13%11%3
1848
October1st to 15thDay
38%46%17%20%11%
1759
16th to endDay
32%45%18%24%15%
1760
November1st to 15thDay
29%37%18%26%13%
1754
16th to endDay
33%47%18%23%13%
1620
December1st to 15thDay
42%48%19%17%8%
1620
16th to endDay
44%310%20%13%8%
1728
January1st to 15thNight
39%48%16%20%9%
2327
16th to endNight
39%47%12%23%12%
2479
February1st to 15thNight
38%45%15%20%15%
2112
16th to endNight
36%48%16%20%14%
1885
March1st to 15thNight
30%5%11%21%20%11%
1980
16th to endNight
31%411%19%22%11%
2112
April1st to 15thNight
32%5%8%21%21%11%
1976
16th to endNight
25%5%12%23%22%11%
1749
May1st to 15thNight
28%7%13%23%17%9%
1620
16th to endNight
32%8%13%27%14%4
1684
June1st to 15thNight
39%11%18%19%9%
1620
16th to endNight
37%12%21%19%8%1
1620
July1st to 15thNight
35%13%25%20%4
1530
16th to endNight
37%13%26%17%4
1595
August1st to 15thNight
41%13%24%16%4
1609
16th to endNight
42%12%23%15%31
1959
September1st to 15thNight
41%11%19%14%10%1
1980
16th to endNight
44%8%13%18%10%4
1858
October1st to 15thNight
34%311%19%19%12%
1870
16th to endNight
30%37%16%24%17%
2112
November1st to 15thNight
30%37%19%23%14%
2101
16th to endNight
32%39%16%22%15%
2340
December1st to 15thNight
38%412%20%16%7%
2340
16th to endNight
41%49%22%13%9%
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
13%20%31%16%10%8%
90
16th to endDay
11%25%36%15%11%
96
February1st to 15thDay
7%27%37%21%5%
90
16th to endDay
12%14%43%26%2
87
March1st to 15thDay
12%10%31%29%14%1
270
16th to endDay
12%6%31%24%19%4
288
April1st to 15thDay
12%12%21%29%19%4
270
16th to endDay
8%224%23%24%16%
270
May1st to 15thDay
6%9%23%26%21%12%
288
16th to endDay
8%212%18%35%22%
331
June1st to 15thDay
14%8%20%28%26%
315
16th to endDay
13%1319%34%27%
315
July1st to 15thDay
4415%31%42%
305
16th to endDay
7%1416%37%31%
326
August1st to 15thDay
13%16%18%30%29%
313
16th to endDay
10%16%17%28%35%
332
September1st to 15thDay
13%111%20%32%19%
315
16th to endDay
20%10%22%29%16%
266
October1st to 15thDay
17%219%30%23%7%
255
16th to endDay
9%323%23%33%6%
272
November1st to 15thDay
17%325%27%17%7%
262
16th to endDay
7%8%37%27%11%6%
90
December1st to 15thDay
11%10%36%27%13%1
90
16th to endDay
19%12%15%36%14%1
96
January1st to 15thNight
14%12%33%28%10%1
720
16th to endNight
16%9%33%31%7%
768
February1st to 15thNight
16%12%30%33%7%
704
16th to endNight
14%10%34%35%5%
631
March1st to 15thNight
11%10%33%33%10%
720
16th to endNight
11%7%30%34%13%
768
April1st to 15thNight
10%7%33%33%13%
718
16th to endNight
9%6%26%37%19%
633
May1st to 15thNight
9%225%42%18%1
540
16th to endNight
7%111%34%39%5%
563
June1st to 15thNight
10%16%36%39%5%
540
16th to endNight
8%6%32%40%11%
540
July1st to 15thNight
7%15%28%40%16%
510
16th to endNight
45%28%49%10%
564
August1st to 15thNight
5%427%50%10%
539
16th to endNight
12%18%23%41%13%
657
September1st to 15thNight
13%17%29%39%9%
720
16th to endNight
17%113%30%31%4
673
October1st to 15thNight
16%118%29%30%3
660
16th to endNight
9%422%33%27%1
704
November1st to 15thNight
11%424%37%22%
700
16th to endNight
12%7%30%31%15%1
720
December1st to 15thNight
14%8%29%30%16%1
720
16th to endNight
17%7%26%32%15%
768
Page generated at 2017-09-20 04:49:50. Version ac04

Copyright 2017 A. Danko


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