Lake Placid
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Lake Placid clear sky chart from 2005-11-05 to 2017-12-04.

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
62%
16364
19%
47864
16%
16324
66%
16324
29%
30642

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
52%
717
18%
2327
15%
716
58%
716
26%
1448
January16th to endNight
51%
768
24%
2445
19%
768
60%
768
30%
1442
February1st to 15thNight
48%
701
23%
2103
16%
698
57%
698
32%
1274
February16th to endNight
52%
631
28%
1797
16%
631
64%
631
39%
1015
March1st to 15thNight
53%
720
30%
1980
18%
720
63%
720
44%
1092
March16th to endNight
59%
768
26%
2112
20%
768
64%
768
41%
1201
April1st to 15thNight
64%
718
22%
1976
18%
718
67%
718
42%
1110
April16th to endNight
59%
720
27%
1836
17%
720
65%
720
43%
1090
May1st to 15thNight
68%
640
26%
1720
18%
640
72%
640
43%
1002
May16th to endNight
76%
561
20%
1682
16%
561
78%
561
33%
1046
June1st to 15thNight
68%
540
9%
1620
7%
540
68%
540
19%
1198
June16th to endNight
71%
540
8%
1620
7%
540
71%
540
20%
1223
July1st to 15thNight
71%
510
6%
1530
6%
510
71%
510
18%
1194
July16th to endNight
76%
564
6%
1595
7%
531
76%
531
18%
1213
August1st to 15thNight
76%
539
6%
1609
6%
536
76%
536
22%
1145
August16th to endNight
63%
758
5%
2075
5%
758
63%
758
16%
1592
September1st to 15thNight
60%
720
5%
1980
5%
720
61%
720
16%
1519
September16th to endNight
60%
717
9%
1980
9%
717
61%
717
17%
1503
October1st to 15thNight
67%
720
21%
2058
22%
720
69%
720
29%
1323
October16th to endNight
60%
768
25%
2304
24%
768
65%
768
31%
1410
November1st to 15thNight
64%
760
28%
2281
25%
760
70%
760
38%
1283
November16th to endNight
60%
780
30%
2347
26%
780
66%
780
34%
1399
December1st to 15thNight
59%
736
24%
2391
23%
736
64%
736
30%
1433
December16th to endNight
58%
768
21%
2496
21%
768
62%
768
29%
1487

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
7%5%37%7%5%7%6%6%8%34%
48611
Night
7%5%25%5%35%5%6%9%43%
48073
TransparencyDay
44%9%14%15%11%4
48312
Night
35%9%16%19%14%5%
47876
SeeingDay
8%212%21%25%29%
6196
Night
9%216%33%28%9%
16373

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
9%5%35%6%35%6%6%10%37%
1611
16th to endDay
9%425%5%445%6%8%43%
1777
February1st to 15thDay
9%425%445%5%47%45%
1750
16th to endDay
7%425%445%5%6%7%46%
1675
March1st to 15thDay
42245%35%5%6%8%50%
1980
16th to endDay
6%425%5%45%5%48%47%
2111
April1st to 15thDay
5%325%6%46%6%8%8%42%
1972
16th to endDay
5%425%6%46%6%6%9%43%
2123
May1st to 15thDay
5%4245%45%6%6%9%45%
2238
16th to endDay
6%5%38%8%5%7%6%6%9%31%
2431
June1st to 15thDay
11%7%410%9%6%7%7%7%8%19%
2340
16th to endDay
8%5%47%9%7%9%9%7%8%22%
2340
July1st to 15thDay
8%7%49%10%6%10%7%7%7%19%
2340
16th to endDay
7%5%410%9%6%9%7%8%9%19%
2465
August1st to 15thDay
6%5%38%9%5%9%8%8%11%22%
2334
16th to endDay
10%7%48%9%6%8%8%7%8%19%
2118
September1st to 15thDay
8%6%49%10%6%7%8%7%8%21%
1980
16th to endDay
11%7%38%9%6%8%8%7%9%19%
1980
October1st to 15thDay
8%5%26%8%47%7%6%9%33%
1900
16th to endDay
8%5%26%6%45%5%6%7%39%
1920
November1st to 15thDay
5%426%5%46%5%5%7%46%
1907
16th to endDay
7%5%26%5%35%5%5%8%44%
1940
December1st to 15thDay
9%5%36%6%35%5%5%8%40%
1651
16th to endDay
5%425%6%36%5%6%10%43%
1728
January1st to 15thNight
7%5%26%6%35%46%9%40%
2327
16th to endNight
9%5%34426%46%9%45%
2445
February1st to 15thNight
9%6%244245%5%8%45%
2103
16th to endNight
5%4134245%6%8%52%
1797
March1st to 15thNight
431442435%9%55%
1980
16th to endNight
5%32343435%8%56%
2112
April1st to 15thNight
22235%35%36%8%55%
1976
16th to endNight
5%31441445%7%55%
1836
May1st to 15thNight
4323425%45%8%55%
1720
16th to endNight
6%3235%46%6%8%9%44%
1682
June1st to 15thNight
8%6%37%7%46%7%8%12%26%
1620
16th to endNight
6%5%37%9%47%6%7%10%31%
1620
July1st to 15thNight
8%7%36%6%46%7%8%10%30%
1620
16th to endNight
45%47%7%47%8%8%12%29%
1703
August1st to 15thNight
5%5%26%6%36%8%8%12%35%
1620
16th to endNight
10%5%36%7%45%8%8%11%29%
2075
September1st to 15thNight
7%6%38%9%46%7%8%11%26%
1980
16th to endNight
8%6%48%8%5%6%7%6%9%28%
1980
October1st to 15thNight
7%5%15%5%345%6%9%42%
2058
16th to endNight
10%5%2432435%9%46%
2304
November1st to 15thNight
5%325%42345%8%51%
2281
16th to endNight
6%4244345%6%8%47%
2347
December1st to 15thNight
8%4345%25%5%6%7%46%
2391
16th to endNight
6%5%245%36%6%5%8%45%
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
40%8%10%18%18%4
1612
16th to endDay
35%5%9%21%19%8%
1777
February1st to 15thDay
37%5%8%16%20%12%
1752
16th to endDay
33%6%12%18%18%11%
1675
March1st to 15thDay
29%6%13%22%19%8%
1980
16th to endDay
33%6%11%20%20%7%
2112
April1st to 15thDay
35%9%12%19%17%5%
1972
16th to endDay
35%6%11%17%21%6%
2123
May1st to 15thDay
33%7%12%19%19%7%
2238
16th to endDay
46%9%14%17%11%
2435
June1st to 15thDay
58%12%14%11%2
2340
16th to endDay
55%14%17%10%1
2340
July1st to 15thDay
59%15%17%6%1
2201
16th to endDay
55%14%19%9%
2310
August1st to 15thDay
49%16%24%8%
2321
16th to endDay
58%15%18%6%
2118
September1st to 15thDay
56%14%18%8%1
1980
16th to endDay
56%14%16%8%2
1980
October1st to 15thDay
44%9%12%14%14%4
1900
16th to endDay
40%6%8%13%18%10%
1920
November1st to 15thDay
35%6%10%20%18%9%
1907
16th to endDay
37%6%9%18%17%11%
1940
December1st to 15thDay
41%6%12%17%15%5%
1651
16th to endDay
34%7%13%22%16%7%
1728
January1st to 15thNight
38%7%14%20%14%4
2327
16th to endNight
34%6%11%23%17%7%
2445
February1st to 15thNight
34%5%9%17%20%11%
2112
16th to endNight
26%7%13%22%21%8%
1797
March1st to 15thNight
25%413%29%20%6%
1980
16th to endNight
26%6%14%24%20%8%
2112
April1st to 15thNight
24%7%17%25%18%6%
1976
16th to endNight
27%6%13%24%22%5%
1836
May1st to 15thNight
25%7%14%27%18%6%
1721
16th to endNight
30%10%19%22%15%
1684
June1st to 15thNight
45%14%21%14%4
1620
16th to endNight
44%15%22%13%4
1620
July1st to 15thNight
44%19%23%10%1
1530
16th to endNight
42%19%25%12%
1595
August1st to 15thNight
35%19%34%9%
1609
16th to endNight
44%19%26%8%1
2075
September1st to 15thNight
47%16%22%10%2
1980
16th to endNight
47%15%18%13%3
1980
October1st to 15thNight
35%9%15%16%18%4
2058
16th to endNight
34%7%11%15%21%10%
2304
November1st to 15thNight
29%5%11%24%22%7%
2281
16th to endNight
31%7%10%21%19%10%
2347
December1st to 15thNight
36%5%12%24%15%6%
2391
16th to endNight
34%6%14%20%16%6%
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%36%21%13%5%
90
16th to endDay
12%13%31%21%17%3
96
February1st to 15thDay
6%10%26%30%17%8%
90
16th to endDay
10%5%27%40%16%
176
March1st to 15thDay
5%327%34%25%4
270
16th to endDay
7%421%28%32%5%
288
April1st to 15thDay
4222%30%31%8%
270
16th to endDay
5%214%30%30%16%
270
May1st to 15thDay
6%111%22%35%23%
288
16th to endDay
6%16%19%30%35%
331
June1st to 15thDay
15%18%11%21%40%
315
16th to endDay
6%38%19%60%
315
July1st to 15thDay
6%1419%67%
305
16th to endDay
8%5%7%19%57%
326
August1st to 15thDay
5%210%17%63%
313
16th to endDay
13%411%16%53%
332
September1st to 15thDay
10%1411%21%51%
315
16th to endDay
11%212%31%42%
314
October1st to 15thDay
9%27%30%33%16%
315
16th to endDay
10%220%30%24%11%
336
November1st to 15thDay
6%15%32%33%11%
325
16th to endDay
6%219%39%28%3
320
December1st to 15thDay
16%328%30%20%3
100
16th to endDay
4116%36%35%6%
96
January1st to 15thNight
9%5%24%40%19%1
720
16th to endNight
10%5%27%41%13%
768
February1st to 15thNight
12%427%42%13%
704
16th to endNight
8%429%44%12%
631
March1st to 15thNight
6%331%42%15%
720
16th to endNight
6%225%47%17%
768
April1st to 15thNight
4323%46%21%
718
16th to endNight
7%223%43%22%
720
May1st to 15thNight
6%15%46%28%2
641
16th to endNight
5%8%38%40%7%
563
June1st to 15thNight
9%1423%47%13%
540
16th to endNight
8%112%48%28%
540
July1st to 15thNight
10%17%45%34%
510
16th to endNight
6%19%42%39%
564
August1st to 15thNight
6%17%45%38%
539
16th to endNight
13%5%15%36%27%
758
September1st to 15thNight
11%5%16%40%24%
720
16th to endNight
13%5%22%42%15%
717
October1st to 15thNight
11%9%35%36%6%
720
16th to endNight
14%116%34%27%4
768
November1st to 15thNight
7%118%43%26%2
760
16th to endNight
8%122%44%20%1
780
December1st to 15thNight
10%218%39%26%1
736
16th to endNight
8%223%38%25%2
768
Page generated at 2017-12-05 10:19:04. Version ac04

Copyright 2017 A. Danko


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