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 2018-02-22.

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%
15542
16%
48898
8%
15512
39%
15512
20%
32905

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%
780
16%
2716
6%
776
31%
776
15%
1855
January16th to endNight
16%
832
15%
2860
4%
832
30%
832
14%
1953
February1st to 15thNight
15%
763
12%
2423
3%
761
26%
761
13%
1772
February16th to endNight
16%
659
18%
1976
6%
659
30%
659
16%
1398
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
36%
374
12%
1497
11%
374
42%
374
17%
958
June1st to 15thNight
38%
360
12%
1440
9%
360
50%
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
55%
340
23%
806
July16th to endNight
57%
376
15%
1418
18%
354
62%
354
23%
835
August1st to 15thNight
54%
496
17%
1567
12%
494
58%
494
29%
946
August16th to endNight
56%
764
20%
1910
11%
764
59%
764
34%
1251
September1st to 15thNight
43%
720
20%
1800
9%
720
48%
720
32%
1193
September16th to endNight
48%
717
26%
1979
19%
717
54%
717
35%
1208
October1st to 15thNight
39%
720
20%
2097
14%
720
47%
720
25%
1380
October16th to endNight
25%
768
16%
2427
8%
768
37%
768
20%
1657
November1st to 15thNight
28%
760
18%
2472
9%
760
41%
760
20%
1615
November16th to endNight
27%
780
17%
2610
10%
780
37%
780
18%
1755
December1st to 15thNight
22%
780
12%
2730
5%
780
32%
780
14%
1945
December16th to endNight
16%
832
13%
2912
3%
832
27%
832
12%
2086

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%37%
49357
Night
17%7%35%5%2445%6%38%
49068
Cloud CoverDay
16%6%35%5%3445%7%37%
49366
Night
17%7%35%5%2445%6%38%
49074
TransparencyDay
45%6%12%20%12%1
49045
Night
45%6%12%21%12%1
48898
SeeingDay
20%13%28%22%11%3
6201
Night
21%13%31%25%8%
15544

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%5%35%5%5%6%34%
1552
16th to endDay
13%7%45%5%46%6%5%6%34%
1716
February1st to 15thDay
16%9%48%7%45%45%5%27%
1767
16th to endDay
15%8%36%6%25%5%46%34%
1644
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%5%145%36%5%6%9%38%
2367
16th to endDay
11%425%5%3445%8%43%
2292
September1st to 15thDay
15%5%25%43445%6%41%
2160
16th to endDay
13%42342345%7%49%
1980
October1st to 15thDay
18%7%25%5%33336%39%
1860
16th to endDay
20%7%35%5%34346%35%
1797
November1st to 15thDay
17%6%36%433446%40%
1716
16th to endDay
17%8%24434445%39%
1677
December1st to 15thDay
18%9%47%6%34446%30%
1560
16th to endDay
20%11%36%5%3445%7%26%
1664
January1st to 15thNight
17%9%46%5%3445%6%33%
2716
16th to endNight
14%10%36%5%34445%33%
2860
February1st to 15thNight
16%9%47%6%45%5%5%5%28%
2422
16th to endNight
17%10%35%5%35%445%34%
1976
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%44%
1577
16th to endNight
13%42442445%7%45%
1910
September1st to 15thNight
15%424334447%45%
1800
16th to endNight
11%5%24323445%51%
1979
October1st to 15thNight
17%5%35%424435%42%
2097
16th to endNight
21%6%25%5%23336%38%
2427
November1st to 15thNight
17%8%25%423336%41%
2472
16th to endNight
17%8%25%5%25%446%37%
2610
December1st to 15thNight
21%9%36%5%2435%5%32%
2730
16th to endNight
20%10%36%5%25%5%5%6%28%
2912

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%35%5%35%6%5%6%34%
1552
16th to endDay
13%7%35%6%36%6%5%6%34%
1716
February1st to 15thDay
16%9%48%8%35%5%5%6%27%
1767
16th to endDay
15%8%37%6%245%46%34%
1644
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%
2367
16th to endDay
12%4245%2446%8%44%
2292
September1st to 15thDay
15%5%245%35%45%6%41%
2160
16th to endDay
13%42342445%7%48%
1980
October1st to 15thDay
18%7%25%5%23337%40%
1860
16th to endDay
20%7%35%5%34346%35%
1797
November1st to 15thDay
17%7%36%423436%40%
1716
16th to endDay
17%7%34424436%39%
1677
December1st to 15thDay
18%9%5%7%6%3445%6%30%
1560
16th to endDay
21%10%36%5%35%45%6%27%
1664
January1st to 15thNight
17%9%46%5%2435%6%34%
2716
16th to endNight
14%10%46%5%3445%5%34%
2860
February1st to 15thNight
15%9%47%6%45%5%5%5%28%
2415
16th to endNight
17%10%25%6%35%445%34%
1976
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%4243245%7%9%44%
1577
16th to endNight
13%324434447%46%
1910
September1st to 15thNight
15%424434346%46%
1800
16th to endNight
11%5%24323446%51%
1979
October1st to 15thNight
17%5%35%424345%42%
2097
16th to endNight
21%6%25%5%23336%37%
2427
November1st to 15thNight
17%8%26%423326%41%
2472
16th to endNight
17%8%36%5%25%45%6%37%
2610
December1st to 15thNight
21%9%35%43435%5%32%
2730
16th to endNight
20%10%36%5%245%6%6%28%
2912

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%6%13%20%9%1
1553
16th to endDay
46%7%15%20%9%
1716
February1st to 15thDay
56%5%11%16%9%
1770
16th to endDay
49%5%11%21%11%1
1644
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
40%10%15%22%11%
2353
16th to endDay
37%7%13%25%15%
2292
September1st to 15thDay
41%7%11%21%16%1
2160
16th to endDay
33%6%11%24%21%1
1980
October1st to 15thDay
45%5%10%23%13%1
1860
16th to endDay
49%5%11%20%10%1
1797
November1st to 15thDay
43%5%14%20%13%1
1716
16th to endDay
44%5%12%23%12%1
1677
December1st to 15thDay
53%6%15%16%7%
1560
16th to endDay
55%7%14%15%7%
1664
January1st to 15thNight
49%5%12%18%11%1
2716
16th to endNight
50%412%19%10%1
2860
February1st to 15thNight
54%6%12%15%9%1
2423
16th to endNight
49%6%11%19%11%1
1976
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%13%1
1567
16th to endNight
36%6%11%28%16%
1910
September1st to 15thNight
38%6%12%25%17%
1800
16th to endNight
32%5%9%26%24%1
1979
October1st to 15thNight
43%412%20%17%1
2097
16th to endNight
48%413%22%10%
2427
November1st to 15thNight
44%5%11%20%14%2
2472
16th to endNight
47%5%14%21%9%1
2610
December1st to 15thNight
52%6%14%17%8%
2730
16th to endNight
53%6%13%17%8%
2912

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
18%32%31%13%4
90
16th to endDay
24%24%40%9%1
108
February1st to 15thDay
25%33%26%12%2
193
16th to endDay
23%23%39%11%3
265
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
14%425%32%16%7%
313
16th to endDay
13%5%19%31%20%10%
332
September1st to 15thDay
15%10%25%24%15%9%
315
16th to endDay
18%5%23%21%17%13%
314
October1st to 15thDay
18%7%26%25%17%4
315
16th to endDay
21%14%31%22%9%
305
November1st to 15thDay
24%14%25%25%10%1
280
16th to endDay
21%21%30%20%41
207
December1st to 15thDay
20%24%33%14%7%
90
16th to endDay
25%33%35%5%1
96
January1st to 15thNight
22%17%38%19%2
780
16th to endNight
21%18%37%20%1
832
February1st to 15thNight
20%18%38%21%
764
16th to endNight
23%18%38%17%1
659
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
496
16th to endNight
15%219%37%22%3
764
September1st to 15thNight
17%430%30%15%1
720
16th to endNight
15%6%24%28%19%4
717
October1st to 15thNight
20%8%26%31%12%
720
16th to endNight
24%12%33%24%4
768
November1st to 15thNight
22%13%30%24%8%
760
16th to endNight
21%14%33%22%7%
780
December1st to 15thNight
27%15%30%21%4
780
16th to endNight
26%16%37%17%1
832
Page generated at 2018-02-23 11:21:36. Version ac04

Copyright 2018 A. Danko


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