Green Swamp Wildlife Management Area
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Green Swamp Wildlife Management Area clear sky chart from 2005-11-06 to 2024-02-15.

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
55%
24594
19%
79770
15%
24489
61%
24489
26%
50803

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
40%
755
20%
4040
15%
737
52%
737
16%
2459
January11th to 20thNight
46%
756
18%
4071
19%
740
57%
740
15%
2740
January21st to endNight
34%
832
16%
4278
14%
814
45%
814
15%
2539
February1st to 10thNight
41%
760
24%
2280
15%
760
51%
760
30%
1406
February11th to 20thNight
45%
719
24%
2154
14%
719
55%
719
34%
1231
February21st to endNight
43%
592
27%
1704
14%
592
53%
592
34%
1026
March1st to 10thNight
45%
720
30%
1980
17%
720
56%
720
44%
1094
March11th to 20thNight
47%
720
28%
1980
17%
720
56%
720
37%
1158
March21st to endNight
46%
792
29%
2178
18%
792
56%
792
40%
1238
April1st to 10thNight
49%
720
23%
1980
16%
720
54%
720
39%
1139
April11th to 20thNight
45%
711
20%
1950
12%
711
52%
711
34%
1189
April21st to endNight
57%
720
29%
1800
18%
720
62%
720
45%
1048
May1st to 10thNight
68%
556
29%
1636
21%
556
73%
556
45%
879
May11th to 20thNight
65%
531
17%
1592
12%
531
69%
531
33%
977
May21st to endNight
72%
582
22%
1744
17%
582
74%
582
33%
1080
June1st to 10thNight
65%
540
13%
1620
11%
540
66%
540
22%
1144
June11th to 20thNight
74%
540
12%
1620
10%
540
75%
540
26%
1098
June21st to endNight
70%
540
8%
1620
7%
540
70%
540
20%
1175
July1st to 10thNight
71%
525
5%
1575
5%
525
71%
525
18%
1204
July11th to 20thNight
74%
522
3%
1566
4%
522
74%
522
18%
1199
July21st to endNight
72%
591
7%
1672
6%
558
73%
558
17%
1253
August1st to 10thNight
77%
537
5%
1600
5%
534
77%
534
22%
1151
August11th to 20thNight
76%
537
6%
1714
7%
537
76%
537
19%
1233
August21st to endNight
60%
792
8%
2178
8%
792
60%
792
17%
1644
September1st to 10thNight
65%
720
8%
1980
8%
720
66%
720
17%
1495
September11th to 20thNight
60%
720
8%
1980
8%
720
60%
720
17%
1508
September21st to endNight
57%
720
18%
1980
16%
720
59%
720
22%
1403
October1st to 10thNight
57%
720
21%
1980
18%
720
61%
720
27%
1335
October11th to 20thNight
64%
720
28%
2150
27%
720
69%
720
36%
1242
October21st to endNight
57%
792
27%
2376
24%
792
64%
792
33%
1400
November1st to 10thNight
53%
740
26%
2221
21%
740
61%
740
36%
1285
November11th to 20thNight
50%
760
27%
2280
22%
760
58%
760
30%
1401
November21st to endNight
46%
760
25%
2409
20%
760
55%
760
29%
1456
December1st to 10thNight
52%
760
27%
2470
21%
760
62%
760
32%
1406
December11th to 20thNight
47%
760
24%
2943
21%
758
54%
758
24%
1718
December21st to endNight
46%
832
15%
4469
21%
817
53%
817
15%
2850

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%6%37%7%46%6%7%9%37%
78747
Night
9%6%36%6%35%5%6%9%42%
80338
TransparencyDay
41%10%14%17%13%6%
78470
Night
36%10%15%19%14%5%
80134
SeeingDay
9%6%19%25%23%18%
14468
Night
9%5%21%33%25%8%
24616

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
11%8%25%5%35%5%5%8%41%
2836
11th to 20thDay
20%10%36%5%3445%7%34%
2840
21st to endDay
10%6%36%5%3446%8%45%
3293
February1st to 10thDay
12%6%345%35%5%5%9%43%
1900
11th to 20thDay
7%5%24435%45%7%53%
1788
21st to endDay
9%5%35%6%35%45%7%48%
1551
March1st to 10thDay
4414445%5%5%8%56%
1980
11th to 20thDay
8%425%6%3446%7%51%
1980
21st to endDay
7%5%35%6%3445%6%53%
2178
April1st to 10thDay
7%325%5%36%5%6%8%50%
1980
11th to 20thDay
7%6%25%7%5%6%6%7%8%42%
1956
21st to endDay
43245%45%5%6%10%50%
2160
May1st to 10thDay
5%3245%345%7%8%54%
2337
11th to 20thDay
8%5%37%7%46%6%7%8%40%
2301
21st to endDay
7%5%47%8%6%7%6%8%8%35%
2531
June1st to 10thDay
13%8%49%9%5%8%7%7%9%22%
2340
11th to 20thDay
6%6%47%9%6%9%8%9%11%25%
2340
21st to endDay
7%6%49%10%6%8%8%8%10%24%
2340
July1st to 10thDay
9%7%48%9%6%10%8%11%9%21%
2340
11th to 20thDay
7%6%410%10%5%8%8%8%10%22%
2340
21st to endDay
5%6%49%10%6%10%8%8%10%22%
2547
August1st to 10thDay
6%6%37%9%6%10%8%9%11%24%
2327
11th to 20thDay
6%5%38%9%7%9%8%9%12%23%
2163
21st to endDay
8%7%5%8%10%5%8%7%7%11%22%
2178
September1st to 10thDay
6%7%310%9%6%10%8%8%11%22%
1980
11th to 20thDay
8%7%49%10%6%8%7%8%10%24%
1980
21st to endDay
8%7%39%8%6%8%7%8%8%30%
1980
October1st to 10thDay
10%6%37%7%5%6%6%7%8%34%
1980
11th to 20thDay
6%5%25%5%5%6%6%6%8%46%
1810
21st to endDay
7%5%25%5%35%5%6%9%48%
1980
November1st to 10thDay
7%5%25%6%35%5%5%7%49%
1857
11th to 20thDay
9%5%36%5%45%5%5%8%45%
1900
21st to endDay
9%6%26%6%35%5%7%9%43%
1767
December1st to 10thDay
7%5%36%5%35%47%9%47%
1710
11th to 20thDay
11%6%35%5%4445%9%43%
2153
21st to endDay
11%8%37%7%46%5%6%7%36%
3124
January1st to 10thNight
11%7%47%6%35%5%5%7%40%
4109
11th to 20thNight
18%9%47%5%3445%8%32%
4120
21st to endNight
11%6%36%6%35%6%6%8%40%
4358
February1st to 10thNight
11%8%25%4245%6%8%46%
2280
11th to 20thNight
9%5%245%25%46%8%52%
2153
21st to endNight
7%5%37%5%345%5%8%48%
1704
March1st to 10thNight
4325%434448%59%
1980
11th to 20thNight
7%5%344245%7%9%51%
1980
21st to endNight
5%5%25%4345%5%7%55%
2178
April1st to 10thNight
7%42442447%10%52%
1980
11th to 20thNight
8%425%5%345%5%10%49%
1950
21st to endNight
6%4244345%5%8%57%
1800
May1st to 10thNight
432343445%8%61%
1636
11th to 20thNight
6%426%5%36%6%5%9%48%
1592
21st to endNight
5%326%5%46%5%7%9%47%
1744
June1st to 10thNight
11%6%36%5%46%7%7%10%35%
1620
11th to 20thNight
6%435%7%46%7%9%13%36%
1620
21st to endNight
7%5%36%8%48%7%9%12%31%
1620
July1st to 10thNight
6%6%37%7%47%8%10%11%31%
1620
11th to 20thNight
5%5%38%7%6%8%8%9%11%29%
1620
21st to endNight
4437%9%5%8%8%9%14%29%
1771
August1st to 10thNight
35%38%7%5%7%8%9%13%33%
1611
11th to 20thNight
46%28%8%46%7%12%12%31%
1714
21st to endNight
9%7%38%8%46%7%8%11%30%
2178
September1st to 10thNight
6%6%36%7%5%8%7%9%14%28%
1980
11th to 20thNight
10%6%47%8%5%7%7%8%10%29%
1980
21st to endNight
9%8%38%7%45%6%6%9%34%
1980
October1st to 10thNight
8%7%36%6%36%5%6%9%41%
1980
11th to 20thNight
6%5%25%435%6%7%8%50%
2150
21st to endNight
8%5%35%6%3445%7%50%
2376
November1st to 10thNight
8%4345%3445%7%53%
2221
11th to 20thNight
9%6%35%6%35%45%6%48%
2280
21st to endNight
9%6%36%6%445%5%9%45%
2409
December1st to 10thNight
7%5%25%5%45%5%5%8%50%
2470
11th to 20thNight
13%6%35%5%33447%48%
3042
21st to endNight
14%8%37%6%35%5%5%7%36%
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
39%7%8%18%19%9%
2837
11th to 20thDay
50%45%17%16%8%
2840
21st to endDay
36%6%8%19%22%8%
3293
February1st to 10thDay
38%6%9%17%19%11%
1900
11th to 20thDay
29%5%10%19%26%12%
1798
21st to endDay
35%5%11%16%22%10%
1551
March1st to 10thDay
25%7%11%22%25%10%
1980
11th to 20thDay
30%7%12%24%16%10%
1980
21st to endDay
31%5%10%23%22%9%
2178
April1st to 10thDay
30%8%14%22%17%8%
1980
11th to 20thDay
37%8%12%16%21%6%
1956
21st to endDay
28%7%12%21%23%8%
2160
May1st to 10thDay
26%8%12%21%24%10%
2337
11th to 20thDay
40%10%13%19%15%3
2305
21st to endDay
42%10%12%19%15%2
2531
June1st to 10thDay
55%12%15%14%4
2340
11th to 20thDay
47%14%20%17%2
2340
21st to endDay
50%14%19%12%31
2340
July1st to 10thDay
53%17%21%8%1
2275
11th to 20thDay
52%17%22%9%
2271
21st to endDay
50%16%21%11%1
2405
August1st to 10thDay
47%17%26%9%
2314
11th to 20thDay
49%18%23%10%1
2163
21st to endDay
53%17%18%11%2
2178
September1st to 10thDay
51%17%18%12%3
1980
11th to 20thDay
50%15%19%12%4
1980
21st to endDay
47%13%13%14%10%3
1980
October1st to 10thDay
43%11%12%14%12%8%
1980
11th to 20thDay
33%8%11%21%20%6%
1810
21st to endDay
31%8%12%17%21%12%
1980
November1st to 10thDay
32%8%10%19%19%12%
1857
11th to 20thDay
37%7%9%19%20%9%
1900
21st to endDay
36%7%10%21%19%7%
1767
December1st to 10thDay
32%8%13%25%16%6%
1710
11th to 20thDay
38%7%10%16%17%12%
2150
21st to endDay
45%9%11%17%14%5%
3124
January1st to 10thNight
43%7%9%15%20%6%
4109
11th to 20thNight
50%6%8%18%13%5%
4120
21st to endNight
39%9%11%15%17%8%
4358
February1st to 10thNight
34%7%11%18%19%11%
2280
11th to 20thNight
30%6%11%20%24%9%
2154
21st to endNight
33%5%14%19%23%6%
1704
March1st to 10thNight
24%6%13%26%24%8%
1980
11th to 20thNight
29%5%14%27%15%9%
1980
21st to endNight
26%6%12%28%20%7%
2178
April1st to 10thNight
27%7%20%23%17%7%
1980
11th to 20thNight
30%9%13%24%18%6%
1950
21st to endNight
24%6%15%24%23%7%
1800
May1st to 10thNight
21%8%13%26%22%9%
1636
11th to 20thNight
29%12%22%21%15%1
1593
21st to endNight
30%11%16%22%18%2
1745
June1st to 10thNight
41%13%20%20%6%
1620
11th to 20thNight
35%14%27%21%3
1620
21st to endNight
40%17%23%14%5%
1620
July1st to 10thNight
43%20%27%9%2
1575
11th to 20thNight
44%18%29%8%1
1566
21st to endNight
39%22%27%10%1
1672
August1st to 10thNight
36%20%33%10%1
1600
11th to 20thNight
37%21%30%11%1
1714
21st to endNight
45%18%21%14%2
2178
September1st to 10thNight
42%21%22%12%3
1980
11th to 20thNight
47%16%18%16%31
1980
21st to endNight
43%11%17%16%9%3
1980
October1st to 10thNight
37%12%13%18%13%7%
1980
11th to 20thNight
28%8%13%24%22%5%
2150
21st to endNight
31%7%11%19%22%10%
2376
November1st to 10thNight
30%7%13%20%19%11%
2221
11th to 20thNight
36%7%10%19%19%9%
2280
21st to endNight
35%7%10%23%18%8%
2409
December1st to 10thNight
31%7%14%27%15%6%
2470
11th to 20thNight
36%6%10%20%16%12%
3044
21st to endNight
44%9%12%17%14%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
10%15%42%24%8%
270
11th to 20thDay
7%16%36%28%10%2
270
21st to endDay
13%20%46%16%5%1
297
February1st to 10thDay
14%13%34%24%13%1
270
11th to 20thDay
11%10%37%26%11%5%
252
21st to endDay
9%12%29%34%16%1
269
March1st to 10thDay
413%38%30%14%1
420
11th to 20thDay
12%9%27%31%18%3
420
21st to endDay
6%10%29%32%20%3
462
April1st to 10thDay
9%10%28%29%20%4
420
11th to 20thDay
9%10%27%30%20%4
412
21st to endDay
5%5%25%31%25%9%
420
May1st to 10thDay
6%5%20%34%25%11%
423
11th to 20thDay
11%215%29%27%16%
447
21st to endDay
7%311%19%36%24%
485
June1st to 10thDay
14%310%23%28%23%
450
11th to 20thDay
8%27%23%27%33%
450
21st to endDay
6%16%15%28%45%
450
July1st to 10thDay
8%15%12%26%48%
445
11th to 20thDay
6%1411%33%45%
444
21st to endDay
6%27%18%27%40%
488
August1st to 10thDay
8%1413%33%41%
446
11th to 20thDay
8%1311%30%46%
439
21st to endDay
9%26%22%28%33%
495
September1st to 10thDay
7%27%16%32%38%
450
11th to 20thDay
10%37%21%31%28%
450
21st to endDay
9%38%22%33%26%
450
October1st to 10thDay
10%6%21%31%23%8%
450
11th to 20thDay
6%6%15%36%28%9%
450
21st to endDay
8%5%20%35%28%4
495
November1st to 10thDay
9%6%23%31%25%6%
455
11th to 20thDay
13%7%24%35%17%4
460
21st to endDay
11%7%33%31%16%2
327
December1st to 10thDay
6%11%33%29%17%4
270
11th to 20thDay
13%10%32%31%11%2
270
21st to endDay
9%12%30%35%12%2
297
January1st to 10thNight
11%11%33%33%11%
760
11th to 20thNight
13%9%26%39%13%1
760
21st to endNight
13%10%37%32%7%
836
February1st to 10thNight
15%7%31%34%12%
760
11th to 20thNight
9%9%30%39%12%1
722
21st to endNight
9%8%33%41%9%
592
March1st to 10thNight
5%8%37%39%10%
720
11th to 20thNight
9%8%30%38%13%1
720
21st to endNight
8%6%34%40%12%1
792
April1st to 10thNight
8%8%30%40%13%
720
11th to 20thNight
8%8%32%37%13%1
711
21st to endNight
7%426%43%19%1
720
May1st to 10thNight
6%317%47%24%3
556
11th to 20thNight
5%218%42%29%4
531
21st to endNight
5%112%35%40%7%
584
June1st to 10thNight
13%19%29%37%10%
540
11th to 20thNight
6%16%22%41%23%
540
21st to endNight
9%2315%43%28%
540
July1st to 10thNight
8%1314%44%31%
525
11th to 20thNight
41212%48%33%
522
21st to endNight
5%214%47%31%
591
August1st to 10thNight
31312%52%29%
537
11th to 20thNight
6%148%45%37%
537
21st to endNight
12%27%20%39%20%
792
September1st to 10thNight
8%27%23%42%19%
720
11th to 20thNight
13%28%28%36%14%
720
21st to endNight
11%311%29%38%9%
720
October1st to 10thNight
12%319%39%23%4
720
11th to 20thNight
7%417%39%31%3
720
21st to endNight
9%5%20%39%25%2
792
November1st to 10thNight
9%427%35%21%3
740
11th to 20thNight
10%7%23%42%16%1
760
21st to endNight
11%5%30%39%15%1
760
December1st to 10thNight
8%6%28%37%21%1
760
11th to 20thNight
10%8%29%35%18%1
760
21st to endNight
11%7%28%38%15%1
836
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