Pine Glades Natural Area
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Pine Glades Natural Area 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
64%
16231
19%
46942
16%
16193
67%
16193
30%
29730

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
53%
717
18%
2327
15%
716
60%
716
27%
1428
January16th to endNight
53%
768
24%
2496
21%
768
60%
768
31%
1422
February1st to 15thNight
54%
701
27%
2106
22%
700
60%
700
34%
1219
February16th to endNight
56%
631
28%
1735
18%
631
66%
631
40%
1005
March1st to 15thNight
57%
720
28%
1980
19%
720
65%
720
42%
1137
March16th to endNight
63%
768
27%
2112
22%
768
67%
768
41%
1212
April1st to 15thNight
69%
718
24%
1964
20%
718
72%
718
46%
1081
April16th to endNight
65%
720
25%
1800
15%
720
69%
720
40%
1106
May1st to 15thNight
73%
719
24%
1799
16%
719
74%
719
46%
1053
May16th to endNight
73%
585
19%
1706
16%
585
73%
585
31%
1090
June1st to 15thNight
65%
540
10%
1620
8%
540
65%
540
21%
1169
June16th to endNight
77%
540
10%
1620
9%
540
77%
540
26%
1098
July1st to 15thNight
71%
510
5%
1530
5%
510
71%
510
21%
1084
July16th to endNight
77%
564
9%
1595
8%
531
78%
531
28%
1033
August1st to 15thNight
76%
601
8%
1671
7%
598
76%
598
30%
1087
August16th to endNight
68%
764
6%
1984
5%
764
68%
764
22%
1469
September1st to 15thNight
66%
720
5%
1980
5%
720
66%
720
20%
1442
September16th to endNight
63%
673
7%
1858
7%
673
63%
673
16%
1421
October1st to 15thNight
69%
660
20%
1928
22%
660
70%
660
27%
1251
October16th to endNight
60%
704
20%
2112
20%
704
63%
704
27%
1370
November1st to 15thNight
61%
700
25%
2101
23%
700
67%
700
31%
1299
November16th to endNight
55%
720
26%
2160
22%
720
61%
720
27%
1387
December1st to 15thNight
60%
720
24%
2262
23%
720
65%
720
29%
1388
December16th to endNight
63%
768
23%
2496
23%
768
67%
768
30%
1479

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
9%6%37%7%47%7%7%9%29%
47856
Night
7%425%5%35%6%7%10%41%
47147
TransparencyDay
47%7%14%17%10%3
47557
Night
37%6%17%21%12%3
46950
SeeingDay
9%211%21%27%27%
6045
Night
9%212%29%32%13%
16240

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%428%7%47%5%7%7%32%
1611
16th to endDay
10%435%6%35%5%6%9%38%
1728
February1st to 15thDay
11%6%26%5%4447%8%38%
1747
16th to endDay
9%426%5%3446%9%42%
1738
March1st to 15thDay
7%435%6%46%6%6%10%38%
1980
16th to endDay
8%5%25%7%45%5%6%9%39%
2111
April1st to 15thDay
6%425%7%46%6%7%10%38%
1982
16th to endDay
7%5%26%6%46%6%7%9%36%
2160
May1st to 15thDay
5%325%5%36%8%6%9%42%
2152
16th to endDay
9%6%48%8%5%8%7%8%9%22%
2415
June1st to 15thDay
13%7%48%9%5%8%8%7%9%17%
2340
16th to endDay
9%5%38%8%5%10%9%9%10%20%
2340
July1st to 15thDay
10%7%48%8%5%8%9%10%9%17%
2340
16th to endDay
9%6%47%9%6%9%8%7%10%19%
2465
August1st to 15thDay
9%6%38%8%5%7%8%9%12%21%
2265
16th to endDay
10%7%39%8%5%8%7%8%9%19%
2214
September1st to 15thDay
10%7%39%9%6%9%8%8%11%16%
1980
16th to endDay
11%8%49%11%5%8%8%7%8%15%
1848
October1st to 15thDay
7%6%37%8%5%7%6%9%9%28%
1700
16th to endDay
14%6%36%6%46%6%7%10%27%
1760
November1st to 15thDay
9%6%37%6%46%5%5%7%38%
1757
16th to endDay
12%5%36%6%46%6%6%8%34%
1800
December1st to 15thDay
13%6%37%7%35%5%6%8%33%
1695
16th to endDay
10%5%35%426%7%5%10%36%
1728
January1st to 15thNight
9%6%25%5%345%6%10%41%
2327
16th to endNight
7%3345%345%6%10%45%
2496
February1st to 15thNight
9%4243245%5%8%49%
2102
16th to endNight
5%3244246%6%9%49%
1735
March1st to 15thNight
42145%345%5%9%51%
1980
16th to endNight
4214425%5%6%10%51%
2112
April1st to 15thNight
32134245%6%9%55%
1964
16th to endNight
5%314435%5%6%11%48%
1800
May1st to 15thNight
42234236%6%10%53%
1799
16th to endNight
8%5%15%435%5%8%13%37%
1706
June1st to 15thNight
11%7%37%6%45%7%8%11%26%
1620
16th to endNight
5%436%5%46%7%8%12%34%
1620
July1st to 15thNight
7%5%35%6%5%5%7%8%10%32%
1620
16th to endNight
5%4346%36%7%8%11%37%
1703
August1st to 15thNight
6%415%6%25%6%8%14%38%
1682
16th to endNight
7%5%36%7%47%8%9%12%28%
1984
September1st to 15thNight
7%5%27%6%47%8%10%12%25%
1980
16th to endNight
9%7%37%7%5%7%7%9%10%23%
1858
October1st to 15thNight
7%416%6%47%7%7%9%37%
1928
16th to endNight
12%5%35%5%35%5%5%9%37%
2112
November1st to 15thNight
8%4246%35%5%7%8%42%
2101
16th to endNight
10%5%36%5%3445%7%42%
2160
December1st to 15thNight
8%425%5%36%5%6%7%42%
2262
16th to endNight
7%424445%5%7%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
47%5%9%17%14%4
1612
16th to endDay
42%39%21%16%7%
1728
February1st to 15thDay
42%46%22%16%8%
1749
16th to endDay
38%310%22%16%7%
1738
March1st to 15thDay
37%5%10%25%17%3
1980
16th to endDay
39%411%22%16%6%
2112
April1st to 15thDay
37%5%13%24%16%3
1982
16th to endDay
42%5%8%20%20%3
2160
May1st to 15thDay
33%5%12%25%16%5%
2152
16th to endDay
51%7%14%18%8%
2419
June1st to 15thDay
58%7%16%13%4
2340
16th to endDay
52%9%19%16%1
2340
July1st to 15thDay
55%12%21%9%1
2201
16th to endDay
52%10%23%13%
2310
August1st to 15thDay
49%10%27%11%
2252
16th to endDay
54%11%21%11%
2214
September1st to 15thDay
55%11%21%10%1
1980
16th to endDay
61%8%15%10%3
1848
October1st to 15thDay
48%6%11%17%13%2
1700
16th to endDay
50%5%7%15%16%5%
1760
November1st to 15thDay
44%37%20%18%5%
1757
16th to endDay
46%46%15%18%8%
1800
December1st to 15thDay
48%5%9%16%15%4
1695
16th to endDay
40%5%9%21%18%4
1728
January1st to 15thNight
39%415%23%13%3
2327
16th to endNight
34%313%26%15%6%
2496
February1st to 15thNight
33%39%24%20%7%
2111
16th to endNight
29%414%26%19%5%
1735
March1st to 15thNight
28%412%32%17%5%
1980
16th to endNight
28%413%27%19%5%
2112
April1st to 15thNight
24%419%29%18%3
1964
16th to endNight
31%414%23%21%4
1800
May1st to 15thNight
26%5%13%34%15%5%
1800
16th to endNight
37%6%18%27%9%
1708
June1st to 15thNight
48%8%21%15%6%
1620
16th to endNight
39%10%30%17%1
1620
July1st to 15thNight
44%11%31%11%1
1530
16th to endNight
36%9%35%16%1
1595
August1st to 15thNight
35%9%37%17%
1671
16th to endNight
44%13%29%11%1
1984
September1st to 15thNight
44%12%29%11%1
1980
16th to endNight
51%12%19%12%3
1858
October1st to 15thNight
40%7%14%20%15%1
1928
16th to endNight
42%410%19%18%4
2112
November1st to 15thNight
38%49%20%21%6%
2101
16th to endNight
41%47%19%18%8%
2160
December1st to 15thNight
39%412%23%16%4
2262
16th to endNight
35%5%12%24%17%4
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
17%5%32%30%13%1
90
16th to endDay
19%12%29%23%11%3
96
February1st to 15thDay
9%5%29%35%12%7%
93
16th to endDay
10%424%35%23%1
239
March1st to 15thDay
3335%31%21%3
270
16th to endDay
7%5%22%31%24%9%
288
April1st to 15thDay
5%6%20%28%28%10%
270
16th to endDay
8%315%25%29%17%
270
May1st to 15thDay
6%111%27%32%21%
288
16th to endDay
9%25%22%30%29%
331
June1st to 15thDay
13%25%16%29%32%
315
16th to endDay
5%117%27%56%
315
July1st to 15thDay
319%29%55%
305
16th to endDay
7%19%25%55%
326
August1st to 15thDay
7%28%26%55%
313
16th to endDay
12%139%26%46%
332
September1st to 15thDay
8%147%24%53%
315
16th to endDay
12%117%32%45%
266
October1st to 15thDay
9%2426%37%18%
255
16th to endDay
16%217%27%23%13%
272
November1st to 15thDay
10%411%29%31%12%
265
16th to endDay
10%5%19%34%25%3
270
December1st to 15thDay
20%111%38%24%3
165
16th to endDay
8%112%43%28%6%
96
January1st to 15thNight
12%5%17%35%25%3
720
16th to endNight
8%5%23%40%19%1
768
February1st to 15thNight
10%422%40%19%1
704
16th to endNight
7%326%41%20%1
631
March1st to 15thNight
5%326%40%21%2
720
16th to endNight
5%320%43%25%1
768
April1st to 15thNight
4316%45%27%3
718
16th to endNight
7%216%44%26%2
720
May1st to 15thNight
5%111%44%34%2
720
16th to endNight
9%1429%40%14%
587
June1st to 15thNight
14%1218%40%22%
540
16th to endNight
5%18%47%35%
540
July1st to 15thNight
7%15%46%38%
510
16th to endNight
6%1445%42%
564
August1st to 15thNight
5%25%46%38%
601
16th to endNight
9%2310%40%34%
764
September1st to 15thNight
10%118%43%34%
720
16th to endNight
13%1112%40%30%
673
October1st to 15thNight
10%1429%41%13%
660
16th to endNight
15%210%29%31%9%
704
November1st to 15thNight
9%216%33%31%6%
700
16th to endNight
12%416%38%24%3
720
December1st to 15thNight
9%314%40%28%2
720
16th to endNight
8%317%33%31%4
768
Page generated at 2017-09-20 04:49:45. Version ac04

Copyright 2017 A. Danko


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