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 2018-01-20.

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%
16723
19%
48448
16%
16685
67%
16685
30%
30629

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
51%
777
19%
2522
15%
776
59%
776
27%
1554
January16th to endNight
53%
788
24%
2560
20%
788
60%
788
31%
1465
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
64%
717
7%
1980
7%
717
64%
717
16%
1511
October1st to 15thNight
69%
720
19%
2104
21%
720
70%
720
26%
1381
October16th to endNight
59%
768
21%
2304
20%
768
62%
768
27%
1494
November1st to 15thNight
62%
760
24%
2281
22%
760
67%
760
31%
1407
November16th to endNight
56%
780
27%
2340
23%
780
62%
780
28%
1492
December1st to 15thNight
61%
780
25%
2451
23%
780
67%
780
31%
1467
December16th to endNight
65%
832
24%
2704
25%
832
69%
832
31%
1573

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%
49062
Night
7%425%5%35%6%7%10%41%
48653
TransparencyDay
47%7%14%17%10%3
48763
Night
36%6%17%21%12%3
48456
SeeingDay
9%311%22%26%26%
6494
Night
9%212%29%32%13%
16732

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%5%28%7%46%5%7%7%33%
1746
16th to endDay
9%435%6%35%5%7%9%38%
1768
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%410%11%5%8%8%7%8%15%
1980
October1st to 15thDay
7%6%37%8%5%7%6%9%9%27%
1854
16th to endDay
14%6%36%7%5%6%6%7%9%27%
1920
November1st to 15thDay
9%5%37%6%46%5%5%7%38%
1907
16th to endDay
11%436%6%46%6%7%8%35%
1950
December1st to 15thDay
13%5%26%7%35%5%6%8%35%
1836
16th to endDay
9%5%35%426%7%6%11%37%
1872
January1st to 15thNight
9%6%26%5%345%6%9%41%
2522
16th to endNight
7%3245%35%5%6%10%44%
2560
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%11%23%
1980
October1st to 15thNight
8%416%6%47%7%8%9%35%
2104
16th to endNight
12%5%35%5%35%5%5%9%37%
2304
November1st to 15thNight
7%4246%45%6%7%8%42%
2281
16th to endNight
10%5%36%5%3445%7%42%
2340
December1st to 15thNight
7%425%5%36%5%6%7%45%
2451
16th to endNight
7%3244445%8%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
46%5%9%18%15%4
1747
16th to endDay
41%39%21%16%6%
1768
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%9%15%9%2
1980
October1st to 15thDay
49%6%12%17%12%2
1854
16th to endDay
50%5%7%14%15%6%
1920
November1st to 15thDay
44%47%20%18%5%
1907
16th to endDay
45%46%16%18%8%
1950
December1st to 15thDay
46%5%9%17%15%5%
1836
16th to endDay
38%5%10%24%17%4
1872
January1st to 15thNight
39%414%23%13%4
2522
16th to endNight
34%313%26%15%6%
2560
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
50%12%20%12%3
1980
October1st to 15thNight
40%7%15%20%14%1
2104
16th to endNight
42%411%18%17%5%
2304
November1st to 15thNight
37%49%22%20%5%
2281
16th to endNight
40%47%20%19%7%
2340
December1st to 15thNight
37%312%23%17%5%
2451
16th to endNight
33%6%13%25%16%4
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
17%7%37%26%9%
135
16th to endDay
17%11%33%25%10%2
109
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
10%110%33%42%
314
October1st to 15thDay
10%26%27%36%15%
315
16th to endDay
14%319%29%21%11%
336
November1st to 15thDay
9%312%32%30%11%
325
16th to endDay
10%419%37%24%2
330
December1st to 15thDay
17%212%39%24%3
216
16th to endDay
5%111%43%30%7%
144
January1st to 15thNight
12%5%19%34%23%2
780
16th to endNight
8%5%24%40%18%1
788
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
12%1112%41%30%
717
October1st to 15thNight
10%1428%41%12%
720
16th to endNight
15%211%30%30%9%
768
November1st to 15thNight
9%117%32%32%6%
760
16th to endNight
12%316%38%24%3
780
December1st to 15thNight
9%315%40%28%3
780
16th to endNight
8%316%33%33%5%
832
Page generated at 2018-01-21 12:19:24. Version ac04

Copyright 2018 A. Danko


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