Higgins Lake
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Higgins Lake clear sky chart from 2005-11-05 to 2017-12-02.

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
31%
16076
12%
47831
8%
16034
36%
16034
18%
34774

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
6%
2506
2%
895
17%
895
8%
2146
January16th to endNight
15%
960
6%
2688
2%
960
19%
960
9%
2266
February1st to 15thNight
16%
720
7%
2268
3%
720
20%
720
9%
1847
February16th to endNight
21%
631
9%
1893
4%
631
26%
631
9%
1538
March1st to 15thNight
26%
720
15%
2118
8%
720
32%
720
18%
1518
March16th to endNight
30%
753
18%
2097
10%
753
36%
753
22%
1456
April1st to 15thNight
26%
539
14%
1779
8%
539
34%
539
17%
1258
April16th to endNight
32%
540
19%
1620
7%
540
41%
540
24%
1075
May1st to 15thNight
33%
540
13%
1620
7%
540
40%
540
22%
1109
May16th to endNight
40%
562
14%
1540
6%
561
48%
561
29%
1005
June1st to 15thNight
41%
396
14%
1296
10%
396
47%
396
25%
814
June16th to endNight
50%
407
13%
1307
9%
407
55%
407
28%
808
July1st to 15thNight
59%
510
15%
1360
11%
510
61%
510
42%
791
July16th to endNight
55%
564
15%
1417
10%
531
58%
531
36%
873
August1st to 15thNight
60%
539
19%
1588
14%
536
65%
536
37%
912
August16th to endNight
59%
573
19%
1764
15%
573
62%
573
32%
1064
September1st to 15thNight
55%
623
20%
1883
16%
623
59%
623
34%
1101
September16th to endNight
50%
717
20%
1980
15%
717
53%
717
30%
1276
October1st to 15thNight
36%
720
17%
2046
12%
720
42%
720
23%
1421
October16th to endNight
24%
768
11%
2478
8%
768
30%
768
13%
1849
November1st to 15thNight
28%
760
15%
2471
12%
760
34%
760
16%
1777
November16th to endNight
15%
780
7%
2610
3%
780
20%
780
9%
2110
December1st to 15thNight
12%
894
4%
2712
1%
894
15%
894
7%
2328
December16th to endNight
13%
960
4%
2790
1%
960
16%
960
7%
2432

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%10%47%6%35%45%6%30%
48604
Night
15%10%47%5%3445%6%31%
47999
Cloud CoverDay
15%10%47%6%35%45%6%30%
48613
Night
14%10%5%7%5%3445%6%31%
48004
TransparencyDay
52%6%12%18%9%
48290
Night
52%6%12%18%9%
47831
SeeingDay
18%11%29%23%11%4
6220
Night
19%10%31%27%10%1
16080

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
16%16%8%13%8%6%5%44411%
1432
16th to endDay
12%16%11%15%9%5%5%33411%
1536
February1st to 15thDay
12%16%8%12%13%36%43415%
1591
16th to endDay
11%17%9%11%10%3443417%
1580
March1st to 15thDay
15%9%6%8%8%35%5%5%5%28%
1832
16th to endDay
15%11%48%6%35%445%30%
2136
April1st to 15thDay
20%13%45%433345%31%
2169
16th to endDay
16%10%26%434446%35%
2340
May1st to 15thDay
18%8%36%5%345%45%34%
2331
16th to endDay
13%5%25%5%25%5%5%7%40%
2572
June1st to 15thDay
13%6%25%5%35%5%6%8%36%
2658
16th to endDay
13%5%35%6%35%6%6%8%36%
2648
July1st to 15thDay
9%5%245%36%5%5%9%41%
2520
16th to endDay
10%5%245%35%5%7%9%39%
2655
August1st to 15thDay
9%5%26%6%35%6%6%9%38%
2361
16th to endDay
16%6%25%43445%6%40%
2435
September1st to 15thDay
15%6%2442445%7%41%
2064
16th to endDay
14%5%25%5%25%5%6%7%38%
1980
October1st to 15thDay
21%10%26%5%24435%33%
1914
16th to endDay
24%15%38%6%3445%6%17%
1743
November1st to 15thDay
17%13%37%6%3435%6%28%
1717
16th to endDay
19%20%6%9%6%24335%16%
1677
December1st to 15thDay
17%19%8%12%8%3433313%
1282
16th to endDay
22%18%11%11%7%2433310%
1431
January1st to 15thNight
18%14%8%12%8%4444414%
2506
16th to endNight
12%14%8%13%9%45%45%6%15%
2688
February1st to 15thNight
12%13%8%11%9%46%6%4318%
2266
16th to endNight
15%13%6%12%8%36%445%19%
1893
March1st to 15thNight
14%9%48%5%35%44435%
2105
16th to endNight
13%9%5%6%4245%5%6%36%
2097
April1st to 15thNight
18%12%46%42445%6%31%
1779
16th to endNight
16%9%25%423345%41%
1620
May1st to 15thNight
14%7%26%5%45%6%5%6%35%
1620
16th to endNight
11%5%245%246%5%8%41%
1538
June1st to 15thNight
13%5%245%26%45%8%41%
1296
16th to endNight
9%6%245%25%45%10%44%
1307
July1st to 15thNight
7%324325%46%8%51%
1440
16th to endNight
7%334425%46%10%47%
1513
August1st to 15thNight
7%3234435%6%7%51%
1597
16th to endNight
11%5%1432445%8%48%
1764
September1st to 15thNight
13%424323346%52%
1883
16th to endNight
12%5%244245%5%7%43%
1980
October1st to 15thNight
20%7%35%423336%38%
2046
16th to endNight
22%11%36%5%23346%27%
2478
November1st to 15thNight
14%12%46%5%35%45%7%29%
2471
16th to endNight
18%18%7%8%5%24445%19%
2610
December1st to 15thNight
18%16%7%11%8%45%45%413%
2712
16th to endNight
19%17%9%11%7%34345%12%
2790

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
15%17%8%12%9%5%6%34411%
1432
16th to endDay
12%17%10%14%9%5%6%33411%
1536
February1st to 15thDay
12%15%8%12%13%45%43415%
1591
16th to endDay
11%17%10%10%11%3443417%
1580
March1st to 15thDay
15%9%5%8%8%35%5%46%27%
1842
16th to endDay
14%12%48%6%24445%30%
2135
April1st to 15thDay
20%13%45%5%33335%31%
2169
16th to endDay
16%10%35%5%2445%6%35%
2340
May1st to 15thDay
18%8%36%6%25%45%6%33%
2331
16th to endDay
12%5%26%5%35%45%6%40%
2572
June1st to 15thDay
13%6%25%6%35%46%8%36%
2658
16th to endDay
13%5%26%5%35%6%6%8%36%
2648
July1st to 15thDay
9%5%25%5%36%5%6%9%40%
2520
16th to endDay
10%5%246%346%8%9%38%
2655
August1st to 15thDay
8%5%25%6%35%6%7%8%38%
2361
16th to endDay
14%7%25%4245%5%7%38%
2435
September1st to 15thDay
15%6%24435%45%7%40%
2064
16th to endDay
13%5%35%5%35%5%6%8%37%
1980
October1st to 15thDay
21%9%27%434346%32%
1914
16th to endDay
23%14%48%8%3335%6%17%
1743
November1st to 15thDay
18%12%37%4345%5%7%27%
1717
16th to endDay
19%20%5%10%6%24335%16%
1677
December1st to 15thDay
18%18%8%13%8%35%335%12%
1282
16th to endDay
22%19%10%11%7%2332310%
1431
January1st to 15thNight
18%14%7%12%8%45%45%314%
2506
16th to endNight
11%15%8%12%9%46%45%6%15%
2688
February1st to 15thNight
12%13%8%11%9%46%5%5%418%
2259
16th to endNight
15%14%6%12%8%45%435%19%
1893
March1st to 15thNight
14%9%5%8%5%3444435%
2118
16th to endNight
13%9%5%5%335%446%37%
2097
April1st to 15thNight
19%11%46%42445%6%30%
1779
16th to endNight
15%9%35%423345%41%
1620
May1st to 15thNight
14%6%36%6%45%5%5%6%34%
1619
16th to endNight
12%5%25%4346%5%8%41%
1538
June1st to 15thNight
12%6%25%435%45%8%41%
1296
16th to endNight
8%5%345%3446%9%43%
1307
July1st to 15thNight
7%315%32445%9%50%
1440
16th to endNight
6%425%425%5%6%10%47%
1513
August1st to 15thNight
6%4134345%6%7%51%
1597
16th to endNight
10%5%2442346%8%48%
1764
September1st to 15thNight
12%425%314346%51%
1883
16th to endNight
12%6%2443446%8%43%
1980
October1st to 15thNight
20%9%25%422346%37%
2046
16th to endNight
22%11%47%5%2345%6%26%
2478
November1st to 15thNight
14%11%47%6%35%5%47%29%
2471
16th to endNight
18%18%7%8%6%24445%19%
2610
December1st to 15thNight
18%16%8%10%7%45%445%13%
2712
16th to endNight
19%18%9%11%6%45%44413%
2790

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
74%6%8%7%2
1433
16th to endDay
77%48%7%1
1536
February1st to 15thDay
73%5%8%10%2
1593
16th to endDay
69%5%8%12%3
1580
March1st to 15thDay
56%6%11%17%7%
1842
16th to endDay
54%5%11%19%7%1
2136
April1st to 15thDay
54%49%20%9%
2169
16th to endDay
48%5%13%16%14%2
2340
May1st to 15thDay
51%5%9%21%9%2
2331
16th to endDay
41%6%13%24%12%1
2576
June1st to 15thDay
43%6%13%24%11%
2658
16th to endDay
42%8%15%20%12%
2648
July1st to 15thDay
37%7%13%25%15%1
2371
16th to endDay
38%8%14%21%15%1
2488
August1st to 15thDay
39%8%14%25%11%
2346
16th to endDay
42%6%13%22%12%1
2435
September1st to 15thDay
40%6%13%25%13%1
2064
16th to endDay
41%6%17%25%9%
1980
October1st to 15thDay
53%5%10%21%8%
1914
16th to endDay
66%5%12%10%3
1743
November1st to 15thDay
56%6%12%18%6%
1717
16th to endDay
70%5%11%8%3
1677
December1st to 15thDay
75%5%9%7%1
1282
16th to endDay
78%5%7%6%1
1431
January1st to 15thNight
71%5%9%8%3
2506
16th to endNight
68%7%12%9%2
2688
February1st to 15thNight
67%5%9%14%2
2268
16th to endNight
66%5%10%11%4
1893
March1st to 15thNight
51%5%12%18%10%1
2118
16th to endNight
46%5%12%22%10%1
2097
April1st to 15thNight
52%5%9%20%12%
1779
16th to endNight
43%5%12%20%15%2
1620
May1st to 15thNight
46%5%12%22%10%3
1620
16th to endNight
38%6%15%23%13%2
1540
June1st to 15thNight
39%6%12%23%16%
1296
16th to endNight
35%8%14%24%16%
1307
July1st to 15thNight
27%5%14%29%21%1
1360
16th to endNight
30%7%16%28%15%1
1417
August1st to 15thNight
29%6%18%29%15%
1588
16th to endNight
33%7%15%27%15%1
1764
September1st to 15thNight
32%5%14%31%15%1
1883
16th to endNight
37%6%15%30%9%
1980
October1st to 15thNight
48%410%24%11%1
2046
16th to endNight
57%5%14%16%5%
2478
November1st to 15thNight
52%6%14%17%8%
2471
16th to endNight
66%5%14%9%2
2610
December1st to 15thNight
71%6%10%8%2
2712
16th to endNight
74%5%10%7%2
2790

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
23%10%48%15%2
90
16th to endDay
31%9%40%14%4
96
February1st to 15thDay
22%26%43%6%1
90
16th to endDay
20%24%38%12%3
81
March1st to 15thDay
28%18%34%12%6%
132
16th to endDay
26%7%30%21%10%3
288
April1st to 15thDay
25%15%28%21%9%
270
16th to endDay
23%11%32%18%8%4
270
May1st to 15thDay
23%17%26%19%9%4
288
16th to endDay
16%14%31%24%9%3
472
June1st to 15thDay
16%13%32%25%8%3
495
16th to endDay
13%12%33%27%9%4
495
July1st to 15thDay
10%9%29%28%17%5%
475
16th to endDay
11%7%29%29%15%6%
515
August1st to 15thDay
10%221%33%18%13%
334
16th to endDay
20%6%21%21%21%9%
332
September1st to 15thDay
13%5%20%25%20%14%
315
16th to endDay
13%8%21%28%21%7%
314
October1st to 15thDay
26%9%32%21%8%
315
16th to endDay
30%17%38%9%31
159
November1st to 15thDay
25%17%31%19%41
135
16th to endDay
25%23%36%10%3
117
December1st to 15thDay
31%30%22%11%31
63
16th to endDay
32%30%31%5%
79
January1st to 15thNight
24%16%33%19%5%
900
16th to endNight
20%12%38%23%5%
960
February1st to 15thNight
20%17%35%22%3
723
16th to endNight
24%15%30%25%4
631
March1st to 15thNight
19%15%33%23%7%
720
16th to endNight
20%11%33%26%7%1
753
April1st to 15thNight
21%14%32%26%4
539
16th to endNight
18%9%35%27%6%1
540
May1st to 15thNight
15%9%34%30%8%
540
16th to endNight
14%7%31%32%12%
563
June1st to 15thNight
17%6%29%34%11%
396
16th to endNight
9%330%39%14%1
407
July1st to 15thNight
8%222%43%21%1
510
16th to endNight
7%227%36%24%1
564
August1st to 15thNight
9%122%41%23%2
539
16th to endNight
13%220%37%24%1
573
September1st to 15thNight
14%5%22%30%22%5%
623
16th to endNight
15%5%23%31%19%4
717
October1st to 15thNight
25%6%26%29%10%1
720
16th to endNight
28%13%27%23%6%
768
November1st to 15thNight
20%14%32%23%8%
760
16th to endNight
27%14%35%18%3
780
December1st to 15thNight
26%14%37%18%3
894
16th to endNight
26%15%35%19%3
960
Page generated at 2017-12-03 11:16:44. Version ac04

Copyright 2017 A. Danko


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