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 2017-10-31.

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
48%
15799
28%
47408
19%
15753
57%
15753
35%
26953

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%
576
22%
2112
17%
576
44%
576
25%
1255
April1st to 15thNight
32%
539
25%
1907
16%
539
47%
539
29%
1040
April16th to endNight
37%
540
24%
1779
17%
540
50%
540
31%
1000
May1st to 15thNight
39%
540
22%
1620
14%
540
52%
540
31%
976
May16th to endNight
50%
563
25%
1684
20%
561
60%
561
34%
988
June1st to 15thNight
69%
540
24%
1620
24%
540
73%
540
43%
861
June16th to endNight
72%
540
25%
1620
25%
540
75%
540
46%
847
July1st to 15thNight
73%
510
20%
1530
22%
510
75%
510
40%
839
July16th to endNight
86%
564
29%
1594
36%
531
87%
531
49%
821
August1st to 15thNight
86%
539
32%
1610
37%
536
86%
536
53%
780
August16th to endNight
75%
573
24%
1851
29%
573
76%
573
34%
1056
September1st to 15thNight
67%
540
24%
1937
27%
540
70%
540
32%
1064
September16th to endNight
70%
537
35%
1980
37%
537
74%
537
39%
971
October1st to 15thNight
57%
678
31%
2118
24%
678
64%
678
41%
1141
October16th to endNight
51%
768
38%
2304
22%
768
62%
768
45%
1165
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%
48341
Night
12%413323346%53%
47604
TransparencyDay
37%410%22%19%5%
48041
Night
31%49%23%23%8%
47409
SeeingDay
12%6%19%28%26%7%
5795
Night
14%6%25%32%18%1
15800

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
20%7%35%42333439%
2110
April1st to 15thDay
18%414324346%47%
2040
16th to endDay
18%5%243235%46%41%
2178
May1st to 15thDay
18%5%25%42434442%
2331
16th to endDay
13%7%25%435%447%40%
2430
June1st to 15thDay
9%425%5%35%5%6%8%43%
2340
16th to endDay
7%4245%25%5%6%7%47%
2340
July1st to 15thDay
9%425%5%35%6%7%10%38%
2340
16th to endDay
5%2135%46%6%7%11%45%
2466
August1st to 15thDay
5%3133345%6%9%53%
2340
16th to endDay
8%5%35%6%35%6%6%10%38%
2351
September1st to 15thDay
13%414424447%46%
2021
16th to endDay
8%2244245%47%53%
1980
October1st to 15thDay
14%5%2432333451%
1830
16th to endDay
12%41221223362%
1919
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%24423436%47%
2112
April1st to 15thNight
12%423323347%51%
1907
16th to endNight
14%41321335%9%49%
1779
May1st to 15thNight
12%415%424338%48%
1619
16th to endNight
9%41442445%9%49%
1683
June1st to 15thNight
431341345%8%58%
1620
16th to endNight
5%21331336%8%59%
1620
July1st to 15thNight
5%32432446%11%51%
1620
16th to endNight
411222446%10%58%
1702
August1st to 15thNight
3122235%6%11%59%
1620
16th to endNight
4326%5%35%5%5%9%47%
1851
September1st to 15thNight
10%323424445%52%
1937
16th to endNight
6%314423446%57%
1980
October1st to 15thNight
12%412212346%58%
2118
16th to endNight
10%3221233465%
2304
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
48%37%19%17%3
2112
April1st to 15thDay
39%39%21%19%7%
2040
16th to endDay
41%6%8%18%19%4
2178
May1st to 15thDay
45%48%17%19%3
2331
16th to endDay
42%6%12%20%16%
2434
June1st to 15thDay
36%7%11%25%17%1
2340
16th to endDay
32%6%14%23%20%2
2340
July1st to 15thDay
37%8%14%27%12%
2201
16th to endDay
28%7%17%29%15%1
2311
August1st to 15thDay
24%6%16%29%20%2
2326
16th to endDay
38%7%15%24%10%2
2351
September1st to 15thDay
36%6%9%20%17%8%
2021
16th to endDay
28%5%10%23%23%8%
1980
October1st to 15thDay
36%39%17%19%14%
1830
16th to endDay
27%36%18%31%13%
1919
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
39%39%21%20%5%
2112
April1st to 15thNight
32%410%20%20%11%
1907
16th to endNight
31%5%10%21%23%7%
1779
May1st to 15thNight
35%412%18%18%9%
1620
16th to endNight
31%6%15%26%16%3
1685
June1st to 15thNight
23%6%11%31%23%3
1620
16th to endNight
22%5%12%27%27%5%
1620
July1st to 15thNight
26%6%14%32%18%1
1530
16th to endNight
19%6%14%32%24%2
1594
August1st to 15thNight
17%5%16%31%24%5%
1610
16th to endNight
31%6%14%27%16%4
1851
September1st to 15thNight
31%5%10%21%20%11%
1937
16th to endNight
25%39%25%24%11%
1980
October1st to 15thNight
27%310%22%20%15%
2118
16th to endNight
23%2419%31%18%
2304
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
13%19%32%25%9%
96
April1st to 15thDay
21%10%34%22%11%
159
16th to endDay
26%11%28%19%12%2
288
May1st to 15thDay
17%12%32%24%10%2
468
16th to endDay
15%7%31%28%14%2
517
June1st to 15thDay
11%215%34%30%6%
495
16th to endDay
8%213%32%33%9%
495
July1st to 15thDay
8%112%33%34%10%
475
16th to endDay
3426%46%18%
515
August1st to 15thDay
7%1432%41%12%
493
16th to endDay
10%17%30%37%11%
391
September1st to 15thDay
49%21%50%14%
176
16th to endDay
5%8%35%36%12%
135
October1st to 15thDay
8%322%35%22%6%
135
16th to endDay
7%10%18%40%19%2
144
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
14%9%38%28%7%
576
April1st to 15thNight
14%12%38%25%9%
539
16th to endNight
17%7%35%27%11%
540
May1st to 15thNight
14%5%34%32%11%
540
16th to endNight
10%329%34%20%2
563
June1st to 15thNight
5%216%42%30%3
540
16th to endNight
5%15%37%35%5%
540
July1st to 15thNight
5%11%40%39%3
510
16th to endNight
3431%51%8%
564
August1st to 15thNight
4437%46%6%
539
16th to endNight
6%6%40%40%5%
573
September1st to 15thNight
12%9%31%42%3
540
16th to endNight
6%14%38%35%4
537
October1st to 15thNight
14%122%34%24%2
678
16th to endNight
12%6%27%32%18%2
768
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 2017-11-01 16:23:37. Version ac04

Copyright 2017 A. Danko


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