Long Point on Lake Chautauqua
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Long Point on Lake Chautauqua clear sky chart from 2005-11-06 to 2024-01-31.

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
26%
23122
12%
75101
8%
23070
31%
23070
13%
56563

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 10thNight
7%
757
6%
2613
3%
757
12%
757
3%
2306
January11th to 20thNight
10%
760
4%
2470
2%
760
12%
760
5%
2130
January21st to endNight
10%
835
5%
2711
3%
835
14%
835
4%
2396
February1st to 10thNight
9%
720
5%
2340
2%
720
13%
720
6%
2013
February11th to 20thNight
7%
702
7%
2275
2%
700
14%
700
6%
1917
February21st to endNight
10%
592
10%
1826
2%
592
20%
592
8%
1487
March1st to 10thNight
14%
720
13%
1980
6%
720
20%
720
11%
1601
March11th to 20thNight
20%
720
15%
1980
8%
720
27%
720
14%
1503
March21st to endNight
20%
792
15%
2178
6%
792
27%
792
14%
1677
April1st to 10thNight
20%
720
12%
1844
3%
720
25%
720
17%
1390
April11th to 20thNight
24%
699
14%
1763
5%
699
30%
699
22%
1295
April21st to endNight
26%
540
16%
1620
5%
540
34%
540
19%
1142
May1st to 10thNight
32%
540
14%
1620
9%
540
36%
540
18%
1165
May11th to 20thNight
35%
436
16%
1498
11%
436
42%
436
18%
1016
May21st to endNight
45%
388
17%
1551
16%
388
53%
388
24%
885
June1st to 10thNight
40%
360
15%
1440
12%
360
51%
360
20%
878
June11th to 20thNight
41%
360
14%
1440
15%
360
50%
360
20%
869
June21st to endNight
40%
360
15%
1440
16%
360
49%
360
21%
875
July1st to 10thNight
55%
350
15%
1400
19%
350
60%
350
26%
788
July11th to 20thNight
54%
410
18%
1454
21%
410
58%
410
28%
833
July21st to endNight
52%
591
16%
1672
11%
558
57%
558
29%
1059
August1st to 10thNight
59%
537
19%
1600
15%
534
62%
534
32%
961
August11th to 20thNight
53%
534
16%
1598
12%
534
56%
534
27%
1027
August21st to endNight
52%
697
19%
1885
11%
697
54%
697
31%
1229
September1st to 10thNight
47%
720
18%
1800
10%
720
51%
720
28%
1228
September11th to 20thNight
49%
720
24%
1909
15%
720
54%
720
32%
1225
September21st to endNight
39%
720
18%
2014
13%
720
43%
720
21%
1439
October1st to 10thNight
35%
720
16%
2160
13%
720
41%
720
21%
1464
October11th to 20thNight
22%
720
11%
2160
6%
720
29%
720
15%
1597
October21st to endNight
15%
792
15%
2376
6%
792
25%
792
11%
1865
November1st to 10thNight
26%
740
16%
2363
12%
740
33%
740
16%
1679
November11th to 20thNight
16%
760
11%
2660
6%
760
22%
760
9%
2052
November21st to endNight
13%
760
8%
2660
5%
760
18%
760
8%
2158
December1st to 10thNight
8%
760
4%
2660
2%
760
10%
760
4%
2347
December11th to 20thNight
9%
760
4%
3275
1%
759
13%
759
4%
2788
December21st to endNight
6%
830
3%
4866
0%
817
12%
817
2%
4279

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
17%12%5%8%6%3445%6%28%
74803
Night
16%14%6%9%7%34445%27%
75315
TransparencyDay
57%411%18%9%1
74520
Night
60%410%17%8%1
75132
SeeingDay
26%16%29%18%8%3
13492
Night
26%16%27%21%9%1
23133

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 10thDay
14%19%12%16%10%345%3411%
1550
11th to 20thDay
15%22%10%17%11%2433410%
1710
21st to endDay
14%17%11%19%11%5%5%4339%
1872
February1st to 10thDay
17%19%9%15%11%5%5%32312%
1620
11th to 20thDay
14%16%9%17%11%35%43414%
1573
21st to endDay
18%17%6%12%9%3334420%
1426
March1st to 10thDay
16%16%8%12%6%34335%24%
1977
11th to 20thDay
15%17%9%9%5%34345%26%
1980
21st to endDay
19%16%7%7%5%345%4427%
2178
April1st to 10thDay
15%14%7%7%6%34446%29%
2115
11th to 20thDay
20%13%35%5%2445%6%33%
2161
21st to endDay
20%13%46%434345%33%
2340
May1st to 10thDay
19%12%36%6%3445%6%31%
2340
11th to 20thDay
20%8%37%6%44446%35%
2394
21st to endDay
14%5%35%5%35%5%6%8%41%
2725
June1st to 10thDay
17%7%36%6%335%5%9%36%
2520
11th to 20thDay
15%6%35%5%46%5%6%8%37%
2520
21st to endDay
16%5%25%5%35%6%6%9%39%
2520
July1st to 10thDay
12%425%5%45%5%6%9%43%
2520
11th to 20thDay
14%6%36%5%35%6%7%10%35%
2455
21st to endDay
12%6%26%6%46%6%6%8%36%
2547
August1st to 10thDay
12%7%25%6%36%5%7%9%38%
2327
11th to 20thDay
13%7%26%6%5%6%6%6%8%33%
2303
21st to endDay
15%6%25%6%36%5%7%9%36%
2451
September1st to 10thDay
18%7%36%5%345%5%7%36%
2160
11th to 20thDay
15%6%345%345%6%9%41%
2048
21st to endDay
19%8%37%5%45%5%6%7%32%
1944
October1st to 10thDay
21%9%37%6%345%5%7%31%
1800
11th to 20thDay
22%12%47%7%45%5%45%26%
1800
21st to endDay
26%17%47%5%45%345%19%
1980
November1st to 10thDay
14%20%36%6%3345%5%29%
1709
11th to 20thDay
18%23%5%7%6%3335%6%21%
1520
21st to endDay
18%26%8%9%5%245%45%14%
1520
December1st to 10thDay
18%27%14%12%42343311%
1520
11th to 20thDay
16%21%10%17%5%3444414%
1906
21st to endDay
23%24%11%11%6%2423410%
2772
January1st to 10thNight
16%21%9%16%10%5%433311%
2613
11th to 20thNight
16%21%9%15%10%3433413%
2470
21st to endNight
13%19%11%15%12%5%6%33310%
2711
February1st to 10thNight
16%20%7%15%10%45%33314%
2340
11th to 20thNight
14%15%7%15%11%5%6%44415%
2273
21st to endNight
17%14%7%15%9%2444420%
1826
March1st to 10thNight
14%14%8%13%8%5%35%5%5%22%
1970
11th to 20thNight
17%13%6%9%7%34335%29%
1979
21st to endNight
16%14%6%9%6%35%5%5%428%
2178
April1st to 10thNight
16%14%6%7%5%34446%30%
1844
11th to 20thNight
18%12%35%5%35%45%6%34%
1763
21st to endNight
15%12%37%6%35%5%5%6%33%
1620
May1st to 10thNight
19%10%35%7%45%446%32%
1620
11th to 20thNight
14%9%36%6%45%5%47%36%
1497
21st to endNight
13%435%4335%5%9%45%
1550
June1st to 10thNight
13%6%37%5%45%6%6%9%37%
1440
11th to 20thNight
14%7%26%5%35%46%7%40%
1440
21st to endNight
14%5%26%5%35%5%5%8%41%
1440
July1st to 10thNight
8%446%6%3446%8%47%
1440
11th to 20thNight
12%4245%345%6%8%45%
1502
21st to endNight
11%4246%47%6%6%8%42%
1771
August1st to 10thNight
10%5%26%4346%7%8%45%
1611
11th to 20thNight
11%6%35%6%35%6%7%8%39%
1598
21st to endNight
13%5%36%5%35%6%6%8%42%
1885
September1st to 10thNight
15%7%25%5%35%5%5%7%42%
1800
11th to 20thNight
14%6%35%425%446%47%
1909
21st to endNight
20%7%26%6%45%6%47%34%
2014
October1st to 10thNight
19%7%35%6%345%5%6%37%
2160
11th to 20thNight
22%12%46%5%35%45%6%28%
2160
21st to endNight
28%14%46%5%35%445%25%
2376
November1st to 10thNight
17%16%37%5%34447%32%
2363
11th to 20thNight
18%19%5%7%6%45%5%5%5%21%
2660
21st to endNight
17%24%8%9%6%34345%19%
2660
December1st to 10thNight
19%26%14%10%5%3433311%
2660
11th to 20thNight
17%22%11%16%6%2433413%
3288
21st to endNight
23%22%10%11%7%344349%
4884

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 10thDay
77%47%9%3
1551
11th to 20thDay
81%37%7%2
1710
21st to endDay
81%46%6%31
1872
February1st to 10thDay
80%37%6%3
1620
11th to 20thDay
76%36%11%5%
1582
21st to endDay
69%39%14%5%2
1426
March1st to 10thDay
64%311%17%6%
1980
11th to 20thDay
61%48%16%8%2
1980
21st to endDay
61%45%18%10%2
2178
April1st to 10thDay
57%311%17%11%
2115
11th to 20thDay
52%410%22%10%2
2161
21st to endDay
55%39%18%12%2
2340
May1st to 10thDay
54%411%20%9%2
2340
11th to 20thDay
52%410%21%12%1
2398
21st to endDay
41%5%17%22%13%1
2725
June1st to 10thDay
45%413%23%13%1
2520
11th to 20thDay
45%5%14%23%12%
2520
21st to endDay
42%5%14%25%13%1
2520
July1st to 10thDay
38%5%14%26%15%1
2450
11th to 20thDay
43%5%15%24%13%
2380
21st to endDay
45%6%14%22%13%1
2405
August1st to 10thDay
41%6%16%28%10%
2314
11th to 20thDay
47%6%15%24%8%
2303
21st to endDay
43%5%14%26%11%2
2451
September1st to 10thDay
47%5%12%23%12%1
2160
11th to 20thDay
40%5%13%28%14%
2048
21st to endDay
52%410%23%10%1
1944
October1st to 10thDay
53%413%16%12%2
1800
11th to 20thDay
60%5%12%16%7%1
1800
21st to endDay
68%39%12%6%1
1980
November1st to 10thDay
57%5%10%16%10%2
1709
11th to 20thDay
65%310%14%6%2
1520
21st to endDay
73%39%10%31
1520
December1st to 10thDay
80%37%8%2
1520
11th to 20thDay
76%311%9%2
1906
21st to endDay
82%210%6%1
2772
January1st to 10thNight
80%36%7%4
2613
11th to 20thNight
78%29%7%31
2470
21st to endNight
80%36%8%21
2711
February1st to 10thNight
77%38%9%3
2340
11th to 20thNight
75%27%11%4
2275
21st to endNight
69%38%12%7%1
1826
March1st to 10thNight
65%47%17%6%
1980
11th to 20thNight
60%39%18%9%1
1980
21st to endNight
60%46%14%13%2
2178
April1st to 10thNight
56%411%19%9%1
1844
11th to 20thNight
51%411%19%12%2
1763
21st to endNight
51%5%11%19%11%3
1620
May1st to 10thNight
53%48%21%11%3
1620
11th to 20thNight
48%6%10%21%12%3
1498
21st to endNight
36%6%15%27%13%3
1551
June1st to 10thNight
42%6%12%24%15%1
1440
11th to 20thNight
42%5%13%23%15%2
1440
21st to endNight
41%6%12%27%13%
1440
July1st to 10thNight
36%5%14%24%19%3
1400
11th to 20thNight
36%414%28%16%2
1454
21st to endNight
38%7%15%24%16%1
1672
August1st to 10thNight
35%5%14%33%10%2
1600
11th to 20thNight
39%7%17%27%9%1
1598
21st to endNight
38%6%15%27%12%2
1885
September1st to 10thNight
42%6%12%26%12%2
1800
11th to 20thNight
39%314%26%16%1
1909
21st to endNight
50%5%12%21%12%1
2014
October1st to 10thNight
47%5%11%21%15%1
2160
11th to 20thNight
56%5%13%16%9%1
2160
21st to endNight
63%49%14%8%1
2376
November1st to 10thNight
53%5%10%19%10%2
2363
11th to 20thNight
64%410%13%5%3
2660
21st to endNight
70%311%12%31
2660
December1st to 10thNight
81%37%8%2
2660
11th to 20thNight
78%310%8%2
3288
21st to endNight
82%38%7%1
4884

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 10thDay
33%24%30%11%31
195
11th to 20thDay
34%31%24%9%1
270
21st to endDay
33%29%28%9%2
294
February1st to 10thDay
40%24%32%4
240
11th to 20thDay
36%33%27%4
240
21st to endDay
39%23%32%6%
237
March1st to 10thDay
31%24%32%10%3
420
11th to 20thDay
30%23%35%10%21
420
21st to endDay
33%21%27%14%4
462
April1st to 10thDay
31%20%29%14%5%1
420
11th to 20thDay
32%19%25%14%7%4
412
21st to endDay
29%17%34%14%41
420
May1st to 10thDay
33%16%30%14%5%2
423
11th to 20thDay
25%14%30%24%5%2
447
21st to endDay
16%12%33%23%10%5%
485
June1st to 10thDay
20%13%35%22%9%2
450
11th to 20thDay
18%12%30%25%13%2
450
21st to endDay
19%12%32%26%9%2
450
July1st to 10thDay
13%6%29%26%18%7%
445
11th to 20thDay
16%7%30%25%17%5%
444
21st to endDay
12%9%36%24%15%4
488
August1st to 10thDay
12%7%27%29%17%8%
446
11th to 20thDay
19%5%25%28%16%7%
439
21st to endDay
17%8%27%26%15%7%
495
September1st to 10thDay
18%12%23%26%16%5%
450
11th to 20thDay
13%6%27%25%20%9%
450
21st to endDay
22%13%30%20%12%4
450
October1st to 10thDay
25%9%30%18%15%2
450
11th to 20thDay
28%19%30%16%41
450
21st to endDay
42%15%29%12%2
495
November1st to 10thDay
32%21%26%16%32
337
11th to 20thDay
41%21%26%10%21
180
21st to endDay
37%23%34%7%
180
December1st to 10thDay
40%26%25%7%11
180
11th to 20thDay
38%26%28%8%1
180
21st to endDay
39%23%30%8%
198
January1st to 10thNight
32%26%28%11%3
760
11th to 20thNight
32%23%29%13%2
760
21st to endNight
26%26%31%15%2
835
February1st to 10thNight
34%24%29%12%1
720
11th to 20thNight
28%28%32%11%2
703
21st to endNight
32%26%28%13%2
592
March1st to 10thNight
29%21%31%16%3
720
11th to 20thNight
30%19%28%19%41
720
21st to endNight
26%16%33%18%5%1
792
April1st to 10thNight
26%18%32%20%4
720
11th to 20thNight
27%13%32%19%7%1
699
21st to endNight
24%11%33%25%6%
540
May1st to 10thNight
24%11%24%28%11%1
540
11th to 20thNight
18%9%30%35%6%1
436
21st to endNight
15%8%28%29%19%2
389
June1st to 10thNight
14%7%32%32%14%1
360
11th to 20thNight
18%8%26%34%14%
360
21st to endNight
16%7%30%34%12%
360
July1st to 10thNight
9%5%23%40%20%4
350
11th to 20thNight
15%222%35%23%2
410
21st to endNight
12%5%24%35%24%1
591
August1st to 10thNight
12%318%42%22%3
537
11th to 20thNight
14%418%32%29%3
534
21st to endNight
16%5%21%31%23%4
697
September1st to 10thNight
20%7%19%30%21%3
720
11th to 20thNight
17%6%21%28%25%4
720
21st to endNight
23%10%22%26%16%3
720
October1st to 10thNight
23%9%27%24%14%2
720
11th to 20thNight
33%14%27%20%5%1
720
21st to endNight
38%15%28%16%3
792
November1st to 10thNight
31%14%26%23%7%
740
11th to 20thNight
34%21%26%13%5%1
760
21st to endNight
33%24%28%11%4
760
December1st to 10thNight
37%26%24%9%3
760
11th to 20thNight
32%27%25%13%2
760
21st to endNight
34%24%30%11%1
836
Page generated at 2024-01-28 05:26:32. Version ac07

Copyright 2024 Attilla Danko


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