Hugo Lake State Park
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Hugo Lake State Park clear sky chart from 2005-11-05 to 2017-03-21.

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
48%
15105
27%
45195
19%
15059
56%
15059
35%
25816

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
34%
899
30%
2327
13%
895
45%
895
35%
1391
January16th to endNight
34%
960
32%
2496
12%
960
45%
960
36%
1498
February1st to 15thNight
30%
857
24%
2265
8%
853
40%
853
31%
1411
February16th to endNight
27%
566
29%
1828
11%
566
42%
566
28%
1035
March1st to 15thNight
32%
540
25%
1980
15%
540
46%
540
24%
1175
March16th to endNight
33%
546
20%
2002
16%
546
42%
546
24%
1205
April1st to 15thNight
31%
494
26%
1748
16%
494
47%
494
29%
960
April16th to endNight
37%
495
23%
1631
17%
495
49%
495
32%
914
May1st to 15thNight
38%
495
23%
1485
15%
495
50%
495
29%
922
May16th to endNight
52%
515
24%
1540
20%
513
60%
513
33%
916
June1st to 15thNight
70%
495
25%
1485
25%
495
74%
495
44%
784
June16th to endNight
71%
495
24%
1485
23%
495
76%
495
47%
774
July1st to 15thNight
73%
465
21%
1395
23%
465
75%
465
41%
757
July16th to endNight
86%
522
28%
1468
35%
489
87%
489
49%
755
August1st to 15thNight
87%
494
34%
1475
40%
491
88%
491
55%
699
August16th to endNight
76%
525
24%
1696
28%
525
77%
525
35%
948
September1st to 15thNight
65%
495
25%
1775
28%
495
68%
495
30%
1004
September16th to endNight
69%
492
34%
1815
34%
492
74%
492
39%
887
October1st to 15thNight
57%
621
32%
1941
25%
621
63%
621
40%
1054
October16th to endNight
50%
704
36%
2112
21%
704
61%
704
44%
1088
November1st to 15thNight
47%
700
31%
2100
18%
700
58%
700
39%
1133
November16th to endNight
39%
870
30%
2310
16%
870
48%
870
33%
1415
December1st to 15thNight
38%
900
27%
2340
13%
900
47%
900
33%
1462
December16th to endNight
33%
960
25%
2496
11%
960
42%
960
30%
1629

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
14%424424446%46%
45661
Night
12%413323346%53%
45391
TransparencyDay
37%410%22%19%5%
45361
Night
31%49%23%22%8%
45196
SeeingDay
13%6%18%28%26%7%
4869
Night
14%7%26%32%18%1
15106

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
16%413313335%53%
1611
16th to endDay
17%422313435%49%
1728
February1st to 15thDay
19%5%1431333448%
1607
16th to endDay
22%42422223447%
1645
March1st to 15thDay
21%414322336%44%
1980
16th to endDay
21%8%35%42333438%
1989
April1st to 15thDay
19%424313345%47%
1869
16th to endDay
19%5%243235%46%43%
1996
May1st to 15thDay
20%6%35%424445%38%
2136
16th to endDay
14%7%25%435%5%47%38%
2222
June1st to 15thDay
10%4245%35%45%8%44%
2145
16th to endDay
8%4245%25%5%6%7%47%
2145
July1st to 15thDay
9%5%25%5%35%6%7%10%37%
2145
16th to endDay
6%2135%46%6%7%10%44%
2284
August1st to 15thDay
32123246%6%9%55%
2145
16th to endDay
9%5%346%35%6%7%10%38%
2154
September1st to 15thDay
14%414434447%44%
1853
16th to endDay
8%2244245%46%54%
1815
October1st to 15thDay
14%5%3432343450%
1678
16th to endDay
13%41221223461%
1760
November1st to 15thDay
15%31332335%6%51%
1758
16th to endDay
18%41321223454%
1648
December1st to 15thDay
19%7%2431324446%
1620
16th to endDay
22%6%22213225%46%
1728
January1st to 15thNight
14%5%12213245%55%
2327
16th to endNight
15%423212225%56%
2496
February1st to 15thNight
16%5%2331232452%
2255
16th to endNight
16%32432234452%
1828
March1st to 15thNight
19%5%24313345%46%
1980
16th to endNight
15%5%34423336%46%
2002
April1st to 15thNight
12%423323348%50%
1748
16th to endNight
15%41321335%9%48%
1631
May1st to 15thNight
13%425%424338%45%
1484
16th to endNight
9%4145%245%5%9%48%
1539
June1st to 15thNight
421342345%8%59%
1485
16th to endNight
5%21221336%8%59%
1485
July1st to 15thNight
5%22332446%11%52%
1485
16th to endNight
411222446%10%58%
1576
August1st to 15thNight
3122235%6%12%59%
1485
16th to endNight
5%325%5%25%5%5%9%48%
1696
September1st to 15thNight
11%42442445%6%50%
1775
16th to endNight
6%314423446%57%
1815
October1st to 15thNight
13%412212336%57%
1941
16th to endNight
11%31221233464%
2112
November1st to 15thNight
10%314223345%59%
2100
16th to endNight
18%5%2221233452%
2310
December1st to 15thNight
18%5%23212346%49%
2340
16th to endNight
18%5%24323335%47%
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
34%37%24%24%6%
1612
16th to endDay
37%36%23%23%6%
1728
February1st to 15thDay
40%28%21%22%4
1608
16th to endDay
42%16%20%22%6%
1645
March1st to 15thDay
42%29%20%18%7%
1980
16th to endDay
49%36%18%17%3
1991
April1st to 15thDay
39%39%20%19%7%
1869
16th to endDay
41%5%8%19%20%4
1996
May1st to 15thDay
48%49%17%16%3
2136
16th to endDay
44%6%11%19%16%
2226
June1st to 15thDay
36%7%11%26%16%1
2145
16th to endDay
32%6%13%24%20%2
2145
July1st to 15thDay
37%7%14%28%11%
2006
16th to endDay
29%7%17%28%15%1
2129
August1st to 15thDay
22%5%16%30%22%3
2131
16th to endDay
38%6%15%24%11%3
2154
September1st to 15thDay
38%6%10%18%17%9%
1853
16th to endDay
28%49%22%24%9%
1815
October1st to 15thDay
37%37%17%19%14%
1678
16th to endDay
28%26%19%30%12%
1760
November1st to 15thDay
33%39%23%22%7%
1758
16th to endDay
34%2418%30%9%
1648
December1st to 15thDay
42%27%24%19%4
1620
16th to endDay
42%17%23%20%5%
1728
January1st to 15thNight
31%37%19%29%7%
2327
16th to endNight
32%26%21%27%9%
2496
February1st to 15thNight
36%26%23%22%8%
2265
16th to endNight
34%37%23%21%9%
1828
March1st to 15thNight
40%37%19%18%10%
1980
16th to endNight
40%39%19%20%5%
2002
April1st to 15thNight
33%410%19%20%12%
1748
16th to endNight
31%5%10%20%24%7%
1631
May1st to 15thNight
38%5%13%19%15%8%
1485
16th to endNight
32%6%16%26%15%3
1541
June1st to 15thNight
22%6%11%32%22%3
1485
16th to endNight
21%5%12%27%27%5%
1485
July1st to 15thNight
26%5%14%31%19%1
1395
16th to endNight
19%6%14%32%24%2
1468
August1st to 15thNight
16%415%31%26%5%
1475
16th to endNight
30%6%14%27%17%4
1696
September1st to 15thNight
33%5%10%20%18%11%
1775
16th to endNight
25%39%24%24%12%
1815
October1st to 15thNight
28%39%21%21%16%
1941
16th to endNight
24%2419%30%17%
2112
November1st to 15thNight
26%39%23%25%11%
2100
16th to endNight
35%25%17%29%9%
2310
December1st to 15thNight
35%39%21%21%7%
2340
16th to endNight
40%38%19%21%7%
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
22%16%31%20%10%
90
16th to endDay
14%20%39%14%8%2
96
February1st to 15thDay
17%16%41%18%5%
90
16th to endDay
22%20%35%16%31
81
March1st to 15thDay
24%17%38%13%5%
90
16th to endDay
15%20%20%28%14%
63
April1st to 15thDay
25%8%35%17%13%
108
16th to endDay
26%8%28%20%12%2
226
May1st to 15thDay
19%11%32%24%9%1
393
16th to endDay
16%6%28%29%15%2
437
June1st to 15thDay
11%315%32%30%6%
420
16th to endDay
8%212%30%34%11%
420
July1st to 15thDay
8%113%35%31%8%
400
16th to endDay
3427%46%17%
445
August1st to 15thDay
41432%43%14%
418
16th to endDay
12%1430%38%11%
322
September1st to 15thDay
5%7%25%46%15%
128
16th to endDay
48%30%38%17%
90
October1st to 15thDay
7%223%37%21%7%
90
16th to endDay
9%8%14%45%20%1
96
November1st to 15thDay
22%422%30%20%1
90
16th to endDay
30%21%20%21%5%2
90
December1st to 15thDay
18%11%34%23%11%1
90
16th to endDay
21%19%34%17%42
96
January1st to 15thNight
17%13%32%28%7%
900
16th to endNight
17%11%33%30%6%
960
February1st to 15thNight
19%14%32%28%5%
857
16th to endNight
19%12%37%26%3
566
March1st to 15thNight
22%9%33%29%5%
540
16th to endNight
15%9%38%29%6%
546
April1st to 15thNight
14%12%38%24%9%
494
16th to endNight
17%6%35%28%10%1
495
May1st to 15thNight
15%5%35%32%10%
495
16th to endNight
11%227%34%21%2
515
June1st to 15thNight
4315%42%30%3
495
16th to endNight
6%14%36%36%5%
495
July1st to 15thNight
5%12%40%38%3
465
16th to endNight
3432%50%8%
522
August1st to 15thNight
3438%46%6%
494
16th to endNight
6%5%40%40%5%
525
September1st to 15thNight
13%110%32%41%2
495
16th to endNight
5%115%36%35%5%
492
October1st to 15thNight
14%122%35%22%2
621
16th to endNight
13%6%27%31%18%1
704
November1st to 15thNight
12%7%29%33%15%
700
16th to endNight
22%9%27%28%12%
870
December1st to 15thNight
22%8%28%32%7%
900
16th to endNight
21%10%31%29%7%
960
Page generated at 2017-03-22 01:42:22. Version ac04

Copyright 2017 A. Danko


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