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 2017-04-01.

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
61%
15481
19%
45324
16%
15441
65%
15441
29%
29010

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%
662
24%
1822
20%
662
67%
662
40%
1040
April16th to endNight
58%
660
25%
1683
15%
660
63%
660
41%
1011
May1st to 15thNight
69%
587
27%
1577
19%
587
73%
587
43%
918
May16th to endNight
75%
513
18%
1538
15%
513
77%
513
32%
969
June1st to 15thNight
70%
495
9%
1485
8%
495
70%
495
20%
1075
June16th to endNight
72%
495
8%
1485
7%
495
72%
495
21%
1109
July1st to 15thNight
70%
465
6%
1395
6%
465
70%
465
16%
1111
July16th to endNight
77%
522
6%
1469
7%
489
77%
489
19%
1109
August1st to 15thNight
76%
494
6%
1474
6%
491
76%
491
22%
1044
August16th to endNight
62%
694
5%
1901
4%
694
62%
694
16%
1463
September1st to 15thNight
60%
660
5%
1815
4%
660
60%
660
16%
1390
September16th to endNight
59%
657
8%
1815
8%
657
60%
657
16%
1399
October1st to 15thNight
68%
660
22%
1886
23%
660
70%
660
30%
1203
October16th to endNight
60%
704
24%
2112
23%
704
64%
704
31%
1298
November1st to 15thNight
62%
700
29%
2101
26%
700
69%
700
37%
1202
November16th to endNight
58%
720
29%
2166
25%
720
65%
720
33%
1297
December1st to 15thNight
59%
720
24%
2340
24%
720
63%
720
29%
1413
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%
45763
Night
7%5%25%5%35%5%6%9%43%
45533
TransparencyDay
44%9%13%15%11%4
45464
Night
35%9%16%19%14%5%
45336
SeeingDay
8%212%21%25%30%
5221
Night
9%216%33%28%9%
15490

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%326%6%46%6%8%8%41%
1812
16th to endDay
6%425%6%46%6%6%9%42%
1946
May1st to 15thDay
5%4246%45%6%6%9%44%
2051
16th to endDay
6%5%38%8%5%7%6%6%9%30%
2223
June1st to 15thDay
10%6%49%9%6%7%7%7%8%21%
2145
16th to endDay
8%5%47%9%6%10%9%7%8%22%
2145
July1st to 15thDay
9%7%5%9%10%6%10%7%7%7%18%
2145
16th to endDay
7%6%410%10%6%9%7%8%9%19%
2283
August1st to 15thDay
7%6%38%9%5%9%7%8%11%21%
2140
16th to endDay
10%7%5%9%9%6%8%8%8%8%18%
1941
September1st to 15thDay
7%6%410%11%6%7%8%7%8%20%
1815
16th to endDay
11%7%48%9%6%8%8%7%9%18%
1815
October1st to 15thDay
7%5%26%7%47%6%6%9%34%
1742
16th to endDay
9%5%26%6%45%5%6%7%39%
1760
November1st to 15thDay
5%427%5%46%45%7%45%
1757
16th to endDay
7%5%26%5%35%45%9%43%
1791
December1st to 15thDay
9%5%36%6%35%5%5%8%39%
1620
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
23245%35%36%8%53%
1822
16th to endNight
5%315%41445%6%55%
1683
May1st to 15thNight
4323425%45%9%55%
1577
16th to endNight
6%3246%46%6%8%9%43%
1538
June1st to 15thNight
7%6%36%6%46%7%8%12%27%
1485
16th to endNight
6%426%9%47%6%7%11%32%
1485
July1st to 15thNight
9%7%36%6%46%7%8%10%28%
1485
16th to endNight
4437%6%48%8%8%12%29%
1577
August1st to 15thNight
5%5%25%5%35%7%8%13%35%
1485
16th to endNight
9%5%37%7%45%8%8%11%28%
1901
September1st to 15thNight
6%7%38%9%46%7%7%11%26%
1815
16th to endNight
8%6%48%8%5%6%7%7%10%26%
1815
October1st to 15thNight
7%5%15%5%345%6%9%43%
1886
16th to endNight
10%5%2433445%8%46%
2112
November1st to 15thNight
6%425%42345%8%50%
2101
16th to endNight
7%5%344345%5%9%47%
2166
December1st to 15thNight
9%4345%25%5%6%7%45%
2340
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
36%9%12%19%16%5%
1812
16th to endDay
36%7%10%17%21%7%
1946
May1st to 15thDay
34%7%13%19%18%6%
2051
16th to endDay
48%9%13%17%10%
2227
June1st to 15thDay
55%12%15%12%3
2145
16th to endDay
55%13%17%11%1
2145
July1st to 15thDay
61%15%16%5%1
2006
16th to endDay
56%13%19%9%
2128
August1st to 15thDay
51%15%24%8%
2127
16th to endDay
59%15%18%5%
1941
September1st to 15thDay
57%14%17%9%1
1815
16th to endDay
58%14%15%8%2
1815
October1st to 15thDay
43%8%12%14%15%5%
1742
16th to endDay
41%6%9%14%19%9%
1760
November1st to 15thDay
36%5%9%19%18%10%
1757
16th to endDay
37%6%9%18%16%11%
1791
December1st to 15thDay
42%6%12%16%15%5%
1620
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
25%7%17%25%16%6%
1822
16th to endNight
28%6%13%22%22%6%
1683
May1st to 15thNight
25%7%15%28%18%5%
1578
16th to endNight
31%10%19%22%15%
1540
June1st to 15thNight
43%14%22%15%4
1485
16th to endNight
42%15%22%14%4
1485
July1st to 15thNight
46%19%22%8%2
1395
16th to endNight
41%19%25%13%
1469
August1st to 15thNight
35%19%34%10%
1474
16th to endNight
44%19%26%8%1
1901
September1st to 15thNight
47%15%23%10%2
1815
16th to endNight
49%15%17%13%3
1815
October1st to 15thNight
34%9%15%16%19%4
1886
16th to endNight
35%6%11%15%21%9%
2112
November1st to 15thNight
30%5%10%22%22%8%
2101
16th to endNight
32%6%9%21%18%10%
2166
December1st to 15thNight
36%5%12%23%15%6%
2340
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
5%219%28%35%8%
212
16th to endDay
4314%27%32%18%
210
May1st to 15thDay
7%9%21%35%26%
228
16th to endDay
7%16%16%31%36%
267
June1st to 15thDay
13%7%9%23%46%
255
16th to endDay
4138%18%63%
255
July1st to 15thDay
6%15%18%68%
245
16th to endDay
8%5%7%18%58%
270
August1st to 15thDay
5%311%15%62%
253
16th to endDay
11%410%14%58%
268
September1st to 15thDay
8%412%21%52%
255
16th to endDay
11%29%28%47%
254
October1st to 15thDay
8%27%29%34%18%
255
16th to endDay
11%118%27%27%13%
272
November1st to 15thDay
7%15%30%33%12%
265
16th to endDay
5%320%37%28%4
261
December1st to 15thDay
17%330%31%17%
90
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%
662
16th to endNight
8%223%42%22%
660
May1st to 15thNight
6%15%46%28%2
588
16th to endNight
5%8%37%40%7%
515
June1st to 15thNight
8%1424%47%14%
495
16th to endNight
7%112%48%29%
495
July1st to 15thNight
10%17%44%35%
465
16th to endNight
6%19%42%38%
522
August1st to 15thNight
6%17%44%38%
494
16th to endNight
12%5%15%36%29%
694
September1st to 15thNight
10%6%16%40%25%
660
16th to endNight
13%5%22%41%16%
657
October1st to 15thNight
11%9%35%36%6%
660
16th to endNight
14%117%33%28%4
704
November1st to 15thNight
7%119%43%25%3
700
16th to endNight
8%123%42%20%1
720
December1st to 15thNight
10%319%40%25%
720
16th to endNight
8%223%38%25%2
768
Page generated at 2017-04-02 07:39:10. Version ac04

Copyright 2017 A. Danko


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