Indian Lake State Park
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Indian Lake State Park clear sky chart from 2005-11-05 to 2017-09-20.

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
38%
15702
16%
46763
11%
15660
44%
15660
21%
32419

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
14%
900
11%
2506
4%
895
21%
895
11%
2026
January16th to endNight
17%
769
12%
2497
4%
769
25%
769
11%
1956
February1st to 15thNight
19%
701
10%
2214
4%
701
25%
701
13%
1663
February16th to endNight
20%
631
12%
1893
5%
631
27%
631
12%
1457
March1st to 15thNight
27%
720
14%
2079
9%
720
32%
720
16%
1534
March16th to endNight
28%
768
16%
2112
9%
768
35%
768
20%
1510
April1st to 15thNight
28%
590
14%
1842
7%
590
35%
590
20%
1261
April16th to endNight
36%
540
19%
1620
8%
540
45%
540
23%
1089
May1st to 15thNight
36%
540
13%
1620
8%
540
41%
540
19%
1156
May16th to endNight
52%
562
16%
1684
13%
561
56%
561
29%
1067
June1st to 15thNight
56%
540
16%
1524
11%
540
62%
540
34%
945
June16th to endNight
59%
540
16%
1440
12%
540
64%
540
34%
910
July1st to 15thNight
60%
510
16%
1360
14%
510
62%
510
33%
875
July16th to endNight
73%
564
20%
1566
17%
531
75%
531
40%
884
August1st to 15thNight
70%
539
20%
1609
18%
536
71%
536
35%
963
August16th to endNight
70%
573
21%
1785
19%
573
73%
573
35%
1032
September1st to 15thNight
63%
670
26%
1930
20%
670
67%
670
35%
1153
September16th to endNight
60%
677
25%
1870
19%
677
63%
677
33%
1163
October1st to 15thNight
50%
660
23%
1875
19%
660
56%
660
32%
1164
October16th to endNight
30%
704
18%
2189
11%
704
39%
704
20%
1491
November1st to 15thNight
39%
700
23%
2276
18%
700
47%
700
24%
1406
November16th to endNight
26%
720
14%
2340
10%
720
33%
720
14%
1735
December1st to 15thNight
19%
720
9%
2340
5%
720
24%
720
10%
1847
December16th to endNight
14%
864
9%
2592
3%
864
20%
864
9%
2132

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
15%8%47%5%3445%7%33%
48059
Night
15%9%36%5%2445%6%36%
46945
Cloud CoverDay
14%8%47%5%3445%7%33%
48069
Night
15%9%36%5%2445%6%36%
46949
TransparencyDay
49%5%12%19%11%1
47759
Night
48%5%11%20%13%1
46763
SeeingDay
18%7%24%22%17%9%
5747
Night
19%8%27%28%14%2
15706

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
19%16%7%12%7%34225%17%
1432
16th to endDay
12%18%9%10%8%35%445%16%
1723
February1st to 15thDay
15%13%6%12%8%35%33421%
1648
16th to endDay
13%14%6%11%7%34336%23%
1580
March1st to 15thDay
20%13%7%7%5%24345%24%
1869
16th to endDay
20%11%5%8%5%23336%28%
2112
April1st to 15thDay
18%10%46%435%35%6%32%
2116
16th to endDay
18%6%25%5%335%46%36%
2340
May1st to 15thDay
20%8%37%5%35%35%5%30%
2331
16th to endDay
11%5%26%5%35%6%6%8%38%
2431
June1st to 15thDay
12%426%5%36%5%5%8%39%
2433
16th to endDay
11%425%5%46%6%7%9%36%
2520
July1st to 15thDay
11%5%25%5%36%6%6%10%37%
2520
16th to endDay
9%315%5%35%6%6%10%41%
2492
August1st to 15thDay
8%325%5%45%6%7%10%41%
2340
16th to endDay
9%4245%45%5%6%10%40%
2414
September1st to 15thDay
12%5%245%25%45%8%43%
2016
16th to endDay
15%6%25%5%24446%43%
1859
October1st to 15thDay
13%7%26%5%235%46%41%
1755
16th to endDay
21%7%35%5%245%36%33%
1680
November1st to 15thDay
12%8%34424346%44%
1582
16th to endDay
18%14%5%8%6%33245%28%
1620
December1st to 15thDay
20%17%7%8%5%3434419%
1620
16th to endDay
20%16%8%10%7%34335%16%
1626
January1st to 15thNight
21%13%6%10%7%3433422%
2506
16th to endNight
15%17%6%8%6%35%34423%
2497
February1st to 15thNight
18%13%5%7%6%24335%27%
2212
16th to endNight
15%13%6%11%6%3435%5%25%
1893
March1st to 15thNight
17%9%47%6%34445%31%
2067
16th to endNight
15%10%37%5%245%5%5%34%
2112
April1st to 15thNight
17%6%36%5%235%5%8%33%
1842
16th to endNight
14%6%37%5%3445%6%38%
1620
May1st to 15thNight
19%7%36%5%25%5%6%7%31%
1620
16th to endNight
11%415%435%5%5%9%43%
1682
June1st to 15thNight
9%4244245%6%7%47%
1524
16th to endNight
8%5%234246%6%8%46%
1440
July1st to 15thNight
9%5%25%43435%8%47%
1440
16th to endNight
5%4234245%6%10%51%
1673
August1st to 15thNight
5%4145%35%5%6%9%47%
1620
16th to endNight
7%4144335%6%8%50%
1785
September1st to 15thNight
11%42432245%7%50%
1930
16th to endNight
11%42442445%6%49%
1870
October1st to 15thNight
12%42442445%6%47%
1875
16th to endNight
19%7%25%433445%37%
2189
November1st to 15thNight
14%7%25%424346%44%
2276
16th to endNight
21%11%47%434445%28%
2340
December1st to 15thNight
21%15%6%7%6%34335%22%
2340
16th to endNight
22%16%6%9%5%34445%18%
2592

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
19%16%7%11%7%34235%17%
1432
16th to endDay
12%18%9%10%8%35%445%16%
1723
February1st to 15thDay
15%13%7%12%8%3433421%
1648
16th to endDay
13%14%7%11%6%34337%23%
1580
March1st to 15thDay
21%12%7%8%5%24345%24%
1880
16th to endDay
19%11%5%8%5%33336%28%
2111
April1st to 15thDay
18%10%46%434346%32%
2116
16th to endDay
18%6%25%5%3345%6%36%
2340
May1st to 15thDay
20%8%47%5%35%45%6%29%
2331
16th to endDay
11%6%26%5%35%5%6%8%37%
2431
June1st to 15thDay
12%5%35%5%36%5%5%8%39%
2433
16th to endDay
11%426%5%36%7%7%9%37%
2520
July1st to 15thDay
10%5%245%35%6%7%9%37%
2520
16th to endDay
8%415%5%35%6%6%10%41%
2492
August1st to 15thDay
8%325%5%35%6%7%10%41%
2340
16th to endDay
9%425%5%445%6%9%40%
2414
September1st to 15thDay
11%5%245%245%6%7%43%
2016
16th to endDay
15%6%25%425%436%42%
1859
October1st to 15thDay
13%7%26%5%24446%41%
1755
16th to endDay
21%7%35%5%34437%32%
1680
November1st to 15thDay
13%7%34424346%44%
1582
16th to endDay
18%14%5%7%6%33235%28%
1620
December1st to 15thDay
21%17%7%8%5%3434419%
1620
16th to endDay
20%16%8%10%6%34335%16%
1626
January1st to 15thNight
21%13%6%10%7%2433422%
2506
16th to endNight
16%17%6%9%5%3434423%
2497
February1st to 15thNight
17%13%5%7%6%24345%27%
2205
16th to endNight
15%13%5%11%5%34345%25%
1893
March1st to 15thNight
17%10%47%5%34445%30%
2079
16th to endNight
15%9%47%5%235%5%5%34%
2112
April1st to 15thNight
17%6%36%5%245%5%8%33%
1842
16th to endNight
14%6%37%5%3435%7%37%
1620
May1st to 15thNight
19%8%26%5%25%46%7%31%
1619
16th to endNight
11%5%15%4345%5%9%43%
1682
June1st to 15thNight
8%4244245%6%8%47%
1524
16th to endNight
8%5%244146%7%8%46%
1440
July1st to 15thNight
9%425%5%2435%8%47%
1440
16th to endNight
44234235%6%9%52%
1673
August1st to 15thNight
5%424445%5%6%8%47%
1620
16th to endNight
7%4144335%6%8%49%
1785
September1st to 15thNight
11%42432245%7%50%
1930
16th to endNight
11%5%24324446%49%
1870
October1st to 15thNight
12%5%24424447%47%
1875
16th to endNight
19%8%25%5%24445%37%
2189
November1st to 15thNight
14%7%26%423346%44%
2276
16th to endNight
21%11%47%5%33445%28%
2340
December1st to 15thNight
21%15%6%7%6%34236%22%
2340
16th to endNight
22%16%6%10%5%24445%18%
2592

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
71%27%11%6%
1433
16th to endDay
68%411%10%3
1723
February1st to 15thDay
66%49%11%7%
1650
16th to endDay
61%412%16%5%
1580
March1st to 15thDay
61%5%11%15%5%
1880
16th to endDay
57%412%19%5%
2112
April1st to 15thDay
53%412%18%10%
2116
16th to endDay
47%5%11%18%12%3
2340
May1st to 15thDay
55%6%11%17%7%1
2331
16th to endDay
42%8%14%22%10%1
2435
June1st to 15thDay
41%7%11%24%13%1
2433
16th to endDay
40%8%15%17%15%2
2520
July1st to 15thDay
41%6%13%19%16%1
2371
16th to endDay
35%8%18%24%10%2
2336
August1st to 15thDay
34%9%13%25%15%2
2327
16th to endDay
36%7%14%23%13%3
2414
September1st to 15thDay
38%7%10%21%18%3
2016
16th to endDay
42%48%20%22%
1859
October1st to 15thDay
43%5%10%21%16%2
1755
16th to endDay
51%412%20%9%
1680
November1st to 15thDay
41%410%22%17%3
1582
16th to endDay
59%39%19%7%
1620
December1st to 15thDay
68%310%13%4
1620
16th to endDay
70%310%11%3
1626
January1st to 15thNight
67%37%13%7%
2506
16th to endNight
64%311%14%6%
2497
February1st to 15thNight
58%412%15%7%
2214
16th to endNight
61%49%17%7%
1893
March1st to 15thNight
54%5%9%18%8%2
2079
16th to endNight
49%5%10%22%9%1
2112
April1st to 15thNight
46%6%13%18%13%1
1842
16th to endNight
45%5%11%18%15%4
1620
May1st to 15thNight
50%6%12%19%9%2
1620
16th to endNight
36%8%12%23%15%3
1684
June1st to 15thNight
32%7%13%24%19%1
1524
16th to endNight
32%8%18%21%15%3
1440
July1st to 15thNight
36%6%11%22%20%3
1360
16th to endNight
26%7%16%31%15%3
1566
August1st to 15thNight
31%7%14%25%20%
1609
16th to endNight
30%7%14%23%21%3
1785
September1st to 15thNight
32%5%11%24%20%4
1930
16th to endNight
35%5%8%22%24%2
1870
October1st to 15thNight
35%5%12%23%21%1
1875
16th to endNight
47%410%23%11%1
2189
November1st to 15thNight
40%48%23%18%4
2276
16th to endNight
57%49%17%9%
2340
December1st to 15thNight
65%310%13%6%
2340
16th to endNight
69%49%13%3
2592

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
26%20%36%11%32
90
16th to endDay
28%20%34%14%11
96
February1st to 15thDay
25%23%42%7%1
90
16th to endDay
12%18%51%13%3
81
March1st to 15thDay
31%16%27%22%2
170
16th to endDay
24%13%33%19%6%2
288
April1st to 15thDay
24%12%28%21%11%1
270
16th to endDay
21%8%30%19%12%6%
270
May1st to 15thDay
29%8%23%23%10%4
288
16th to endDay
15%5%28%23%16%11%
331
June1st to 15thDay
13%424%30%20%6%
408
16th to endDay
15%7%26%27%18%5%
495
July1st to 15thDay
14%123%30%20%10%
475
16th to endDay
9%113%24%28%22%
352
August1st to 15thDay
13%112%22%28%20%
313
16th to endDay
10%215%20%32%18%
332
September1st to 15thDay
15%411%23%27%17%
315
16th to endDay
18%413%20%22%20%
270
October1st to 15thDay
12%5%23%28%21%7%
255
16th to endDay
24%9%35%22%6%
192
November1st to 15thDay
11%10%28%22%22%5%
90
16th to endDay
34%10%40%10%5%
90
December1st to 15thDay
27%17%37%7%7%1
90
16th to endDay
28%20%44%5%1
96
January1st to 15thNight
26%15%37%17%3
900
16th to endNight
23%15%38%19%3
769
February1st to 15thNight
24%12%36%23%2
704
16th to endNight
20%16%35%23%4
631
March1st to 15thNight
22%12%31%26%6%
720
16th to endNight
20%10%33%24%9%1
768
April1st to 15thNight
19%12%36%25%6%
590
16th to endNight
16%7%34%26%12%2
540
May1st to 15thNight
22%7%27%30%12%
540
16th to endNight
14%225%32%21%4
563
June1st to 15thNight
9%223%42%21%
540
16th to endNight
11%218%39%27%
540
July1st to 15thNight
11%217%41%23%2
510
16th to endNight
6%110%40%36%4
564
August1st to 15thNight
8%11%41%31%5%
539
16th to endNight
8%110%34%38%6%
573
September1st to 15thNight
13%313%32%30%6%
670
16th to endNight
14%415%32%28%5%
677
October1st to 15thNight
15%6%23%31%19%4
660
16th to endNight
24%9%32%24%8%
704
November1st to 15thNight
18%10%29%26%13%2
700
16th to endNight
26%15%27%22%8%
720
December1st to 15thNight
28%13%32%20%4
720
16th to endNight
29%13%34%18%3
864
Page generated at 2017-09-21 07:18:10. Version ac04

Copyright 2017 A. Danko


Indian Lake State Park Clear Sky Chart | Charts Home