This page made possible by the sponsorship of: Eric Buehrens.

Lake Taghkanic State Park
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Lake Taghkanic State Park clear sky chart from 2005-11-05 to 2017-08-12.

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
29%
14763
16%
46476
8%
14733
38%
14733
19%
31324

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
18%
720
16%
2506
6%
716
30%
716
15%
1717
January16th to endNight
16%
768
15%
2640
4%
768
30%
768
14%
1806
February1st to 15thNight
16%
703
12%
2233
3%
701
26%
701
13%
1626
February16th to endNight
16%
631
18%
1893
6%
631
30%
631
16%
1332
March1st to 15thNight
15%
720
15%
2160
6%
720
27%
720
16%
1511
March16th to endNight
19%
768
21%
1993
6%
768
30%
768
19%
1381
April1st to 15thNight
18%
718
15%
1796
3%
718
25%
718
18%
1343
April16th to endNight
25%
672
17%
1752
3%
672
33%
672
22%
1207
May1st to 15thNight
26%
483
17%
1563
7%
483
36%
483
17%
1076
May16th to endNight
35%
374
12%
1497
11%
374
42%
374
17%
958
June1st to 15thNight
38%
360
12%
1440
9%
360
49%
360
16%
944
June16th to endNight
46%
360
13%
1440
13%
360
54%
360
25%
830
July1st to 15thNight
51%
340
13%
1360
16%
340
56%
340
23%
806
July16th to endNight
57%
376
15%
1418
18%
354
62%
354
23%
835
August1st to 15thNight
55%
481
17%
1530
13%
479
59%
479
29%
915
August16th to endNight
55%
700
19%
1750
10%
700
58%
700
33%
1149
September1st to 15thNight
43%
660
21%
1650
9%
660
49%
660
32%
1098
September16th to endNight
48%
657
25%
1814
17%
657
54%
657
34%
1120
October1st to 15thNight
37%
660
21%
1922
14%
660
45%
660
24%
1271
October16th to endNight
24%
704
14%
2225
6%
704
36%
704
19%
1539
November1st to 15thNight
28%
700
19%
2277
9%
700
41%
700
20%
1483
November16th to endNight
28%
720
16%
2409
10%
720
37%
720
17%
1643
December1st to 15thNight
22%
720
13%
2520
5%
720
31%
720
14%
1789
December16th to endNight
16%
768
13%
2688
3%
768
27%
768
12%
1945

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
16%6%35%5%3445%7%36%
47499
Night
17%7%35%5%2445%6%37%
46646
Cloud CoverDay
16%6%35%5%3445%7%36%
47508
Night
17%7%35%5%2445%6%37%
46652
TransparencyDay
45%6%12%20%12%1
47187
Night
45%6%12%21%12%1
46476
SeeingDay
20%13%28%22%11%3
5599
Night
21%13%31%25%8%
14765

By Month

Percentage Cloud Cover NE (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
15%8%36%6%35%6%5%6%33%
1432
16th to endDay
13%7%45%6%47%6%5%6%33%
1584
February1st to 15thDay
16%9%47%7%46%45%5%27%
1627
16th to endDay
15%9%36%6%25%5%46%34%
1580
March1st to 15thDay
17%8%5%7%5%2435%6%32%
1790
16th to endDay
17%9%34423345%39%
2226
April1st to 15thDay
19%8%45%5%2344437%
2152
16th to endDay
16%5%25%5%24446%42%
2208
May1st to 15thDay
22%7%35%435%445%34%
2397
16th to endDay
16%5%25%6%345%5%7%37%
2618
June1st to 15thDay
21%5%24435%5%5%8%32%
2520
16th to endDay
14%5%35%6%45%5%6%9%33%
2520
July1st to 15thDay
11%5%26%5%46%5%6%8%37%
2520
16th to endDay
11%425%5%26%6%7%9%38%
2654
August1st to 15thDay
12%4145%36%5%6%9%39%
2319
16th to endDay
11%5%25%5%3446%8%42%
2100
September1st to 15thDay
14%6%25%5%3445%6%41%
1980
16th to endDay
13%42432345%7%48%
1815
October1st to 15thDay
19%7%25%5%23336%38%
1705
16th to endDay
20%7%35%5%35%346%34%
1647
November1st to 15thDay
16%7%36%333446%40%
1581
16th to endDay
18%8%24434446%38%
1548
December1st to 15thDay
18%9%5%7%5%33446%30%
1440
16th to endDay
21%11%36%5%3445%7%26%
1536
January1st to 15thNight
17%9%46%5%2445%6%33%
2506
16th to endNight
15%10%36%5%345%5%5%33%
2640
February1st to 15thNight
14%9%48%6%46%5%5%5%28%
2232
16th to endNight
16%10%35%6%35%445%35%
1893
March1st to 15thNight
19%8%25%5%24445%34%
2147
16th to endNight
17%7%35%424445%40%
1993
April1st to 15thNight
19%9%45%6%33436%33%
1796
16th to endNight
20%6%24434246%40%
1752
May1st to 15thNight
20%6%35%5%24435%37%
1563
16th to endNight
16%5%25%4245%6%7%37%
1495
June1st to 15thNight
20%425%4235%5%7%37%
1440
16th to endNight
12%31443446%8%45%
1440
July1st to 15thNight
12%314435%47%9%42%
1440
16th to endNight
11%425%4445%5%8%42%
1514
August1st to 15thNight
10%4244245%7%9%45%
1540
16th to endNight
13%4244245%5%7%45%
1750
September1st to 15thNight
15%424434347%45%
1650
16th to endNight
12%5%24323445%51%
1814
October1st to 15thNight
18%5%35%424435%41%
1922
16th to endNight
22%6%25%5%23346%37%
2225
November1st to 15thNight
17%8%25%323336%42%
2277
16th to endNight
17%8%35%5%25%446%36%
2409
December1st to 15thNight
21%8%36%5%2435%5%32%
2520
16th to endNight
20%10%36%5%25%5%5%6%27%
2688

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
15%8%36%6%25%6%5%6%33%
1432
16th to endDay
13%6%35%6%37%6%5%6%34%
1584
February1st to 15thDay
16%9%47%8%35%5%5%6%27%
1627
16th to endDay
15%8%37%6%345%46%34%
1580
March1st to 15thDay
18%9%47%5%24446%32%
1800
16th to endDay
17%10%3442335%5%39%
2225
April1st to 15thDay
19%8%35%42434437%
2152
16th to endDay
17%6%245%24446%42%
2208
May1st to 15thDay
22%6%35%435%346%34%
2397
16th to endDay
17%4246%3445%8%37%
2618
June1st to 15thDay
21%5%24425%5%5%8%32%
2520
16th to endDay
15%5%25%6%35%5%6%9%33%
2520
July1st to 15thDay
11%5%35%6%46%5%6%8%37%
2520
16th to endDay
11%425%5%26%7%6%9%39%
2654
August1st to 15thDay
13%4245%35%6%6%9%38%
2319
16th to endDay
12%5%25%5%2446%7%42%
2100
September1st to 15thDay
15%5%345%35%45%6%41%
1980
16th to endDay
13%42341445%7%47%
1815
October1st to 15thDay
19%7%25%5%23337%39%
1705
16th to endDay
20%7%35%434346%34%
1647
November1st to 15thDay
17%7%36%333437%40%
1581
16th to endDay
17%8%34424436%38%
1548
December1st to 15thDay
18%9%5%6%6%3435%6%30%
1440
16th to endDay
21%10%36%5%3445%6%26%
1536
January1st to 15thNight
17%9%46%5%2435%6%33%
2506
16th to endNight
15%10%46%5%345%5%5%33%
2640
February1st to 15thNight
14%9%48%6%45%5%6%5%29%
2225
16th to endNight
16%10%35%6%35%445%35%
1893
March1st to 15thNight
20%8%25%5%25%446%34%
2160
16th to endNight
17%7%35%424445%40%
1993
April1st to 15thNight
19%9%36%6%34345%33%
1796
16th to endNight
20%6%24324346%40%
1752
May1st to 15thNight
20%7%25%435%345%37%
1563
16th to endNight
16%5%25%42446%7%37%
1495
June1st to 15thNight
20%425%4235%5%6%37%
1440
16th to endNight
12%41442447%8%44%
1440
July1st to 15thNight
13%314435%5%7%8%42%
1440
16th to endNight
12%5%25%345%5%6%7%42%
1514
August1st to 15thNight
10%4244245%7%9%45%
1540
16th to endNight
13%43443445%6%45%
1750
September1st to 15thNight
15%424424346%45%
1650
16th to endNight
12%5%24323446%50%
1814
October1st to 15thNight
18%5%35%424345%41%
1922
16th to endNight
22%6%25%5%24346%36%
2225
November1st to 15thNight
17%8%26%423326%41%
2277
16th to endNight
17%8%36%5%25%446%35%
2409
December1st to 15thNight
22%8%35%5%3335%5%32%
2520
16th to endNight
20%10%36%5%245%6%6%27%
2688

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
48%6%14%20%9%1
1433
16th to endDay
46%7%14%20%9%
1584
February1st to 15thDay
56%5%11%16%9%
1630
16th to endDay
49%5%11%21%11%1
1580
March1st to 15thDay
51%413%20%8%1
1800
16th to endDay
46%5%9%18%16%3
2226
April1st to 15thDay
49%5%9%20%12%2
2152
16th to endDay
41%5%8%23%17%3
2208
May1st to 15thDay
51%6%8%18%12%2
2397
16th to endDay
44%8%13%20%12%1
2622
June1st to 15thDay
48%8%13%19%9%1
2520
16th to endDay
44%8%15%20%10%
2520
July1st to 15thDay
43%8%12%20%13%1
2371
16th to endDay
38%10%17%20%11%1
2487
August1st to 15thDay
39%10%15%22%11%
2305
16th to endDay
38%7%12%25%15%
2100
September1st to 15thDay
41%7%11%21%16%1
1980
16th to endDay
34%6%11%23%22%1
1815
October1st to 15thDay
46%410%22%12%2
1705
16th to endDay
50%6%11%19%10%1
1647
November1st to 15thDay
43%5%15%19%13%1
1581
16th to endDay
45%5%11%22%12%1
1548
December1st to 15thDay
53%6%15%16%7%
1440
16th to endDay
56%6%14%15%6%
1536
January1st to 15thNight
50%5%13%18%10%1
2506
16th to endNight
50%412%20%10%1
2640
February1st to 15thNight
53%6%12%16%9%1
2233
16th to endNight
49%5%11%19%12%1
1893
March1st to 15thNight
49%5%12%20%9%1
2160
16th to endNight
45%410%20%15%3
1993
April1st to 15thNight
52%48%19%13%1
1796
16th to endNight
44%5%9%20%17%2
1752
May1st to 15thNight
49%48%19%13%3
1563
16th to endNight
43%8%17%17%11%1
1497
June1st to 15thNight
45%8%13%21%9%1
1440
16th to endNight
35%7%15%28%12%
1440
July1st to 15thNight
35%9%13%26%13%1
1360
16th to endNight
36%8%16%23%13%2
1418
August1st to 15thNight
33%8%17%25%14%1
1530
16th to endNight
37%5%11%29%15%
1750
September1st to 15thNight
38%6%12%25%16%
1650
16th to endNight
33%5%9%25%24%
1814
October1st to 15thNight
44%411%19%18%1
1922
16th to endNight
49%5%13%21%10%
2225
November1st to 15thNight
44%5%12%19%14%3
2277
16th to endNight
48%5%14%20%9%1
2409
December1st to 15thNight
52%6%14%18%8%
2520
16th to endNight
54%6%13%17%7%
2688

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
16%35%28%13%6%
60
16th to endDay
22%26%41%6%2
72
February1st to 15thDay
25%27%28%15%2
143
16th to endDay
22%22%39%12%3
239
March1st to 15thDay
26%19%32%18%2
270
16th to endDay
26%19%28%17%6%2
288
April1st to 15thDay
28%15%30%17%7%
270
16th to endDay
19%17%31%20%7%4
270
May1st to 15thDay
33%15%24%16%9%1
288
16th to endDay
20%11%29%25%11%1
331
June1st to 15thDay
24%9%27%24%13%
315
16th to endDay
16%11%32%22%14%1
315
July1st to 15thDay
12%5%32%30%15%2
305
16th to endDay
12%428%31%19%3
326
August1st to 15thDay
13%324%34%16%7%
297
16th to endDay
13%5%15%31%21%11%
268
September1st to 15thDay
14%8%21%26%17%10%
255
16th to endDay
19%6%21%22%16%12%
254
October1st to 15thDay
19%9%25%23%17%5%
255
16th to endDay
20%15%32%22%8%
251
November1st to 15thDay
23%12%25%25%11%1
235
16th to endDay
21%19%32%19%5%1
168
December1st to 15thDay
16%26%31%20%5%
60
16th to endDay
28%34%28%7%1
64
January1st to 15thNight
22%17%38%19%2
720
16th to endNight
22%19%36%19%1
768
February1st to 15thNight
18%19%38%22%
704
16th to endNight
23%18%38%18%1
631
March1st to 15thNight
26%19%36%15%1
720
16th to endNight
22%23%30%17%6%
768
April1st to 15thNight
25%19%33%18%3
718
16th to endNight
23%15%32%20%7%
672
May1st to 15thNight
21%15%32%24%5%
483
16th to endNight
18%7%34%29%9%
375
June1st to 15thNight
20%8%28%32%10%
360
16th to endNight
13%333%36%13%
360
July1st to 15thNight
13%324%38%18%
340
16th to endNight
11%5%19%43%18%1
376
August1st to 15thNight
13%224%41%16%1
481
16th to endNight
15%220%35%23%3
700
September1st to 15thNight
18%429%30%15%1
660
16th to endNight
15%7%25%29%18%3
657
October1st to 15thNight
20%9%27%31%10%
660
16th to endNight
25%11%33%24%4
704
November1st to 15thNight
23%13%30%24%7%
700
16th to endNight
21%14%32%23%7%
720
December1st to 15thNight
26%16%30%21%4
720
16th to endNight
27%16%36%17%1
768
Page generated at 2017-08-13 14:16:56. Version ac04

Copyright 2017 A. Danko


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