Trout Point Lodge
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Trout Point Lodge clear sky chart from 2005-11-05 to 2017-08-12.

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
21%
14911
11%
46332
5%
14867
28%
14867
13%
35362

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
13%
738
6%
2571
3%
734
17%
734
5%
2167
January16th to endNight
12%
768
5%
2496
1%
768
17%
768
5%
2179
February1st to 15thNight
11%
703
5%
2286
1%
701
16%
701
5%
2007
February16th to endNight
15%
631
8%
1985
2%
631
22%
631
8%
1638
March1st to 15thNight
15%
720
13%
2007
4%
720
24%
720
12%
1573
March16th to endNight
18%
768
14%
2112
4%
768
27%
768
16%
1580
April1st to 15thNight
16%
593
14%
1805
5%
593
25%
593
13%
1343
April16th to endNight
19%
540
14%
1620
5%
540
26%
540
16%
1168
May1st to 15thNight
18%
540
11%
1614
5%
540
25%
540
13%
1220
May16th to endNight
22%
561
11%
1496
4%
560
28%
560
18%
1122
June1st to 15thNight
21%
450
8%
1350
4%
450
26%
450
13%
1039
June16th to endNight
26%
360
9%
1260
4%
360
32%
360
15%
902
July1st to 15thNight
34%
340
10%
1190
9%
340
39%
340
18%
815
July16th to endNight
26%
560
9%
1562
7%
527
29%
527
17%
1180
August1st to 15thNight
37%
528
13%
1575
10%
524
39%
524
21%
1100
August16th to endNight
36%
525
17%
1597
10%
525
41%
525
24%
1063
September1st to 15thNight
32%
550
18%
1705
11%
550
40%
550
22%
1130
September16th to endNight
38%
657
24%
1815
14%
657
46%
657
27%
1170
October1st to 15thNight
30%
660
17%
1972
8%
660
38%
660
19%
1354
October16th to endNight
21%
704
14%
2131
5%
704
30%
704
16%
1553
November1st to 15thNight
27%
715
12%
2364
8%
715
33%
715
13%
1752
November16th to endNight
21%
750
11%
2520
5%
750
28%
750
10%
1922
December1st to 15thNight
15%
750
7%
2520
2%
750
21%
750
8%
2056
December16th to endNight
13%
800
7%
2779
2%
800
19%
800
5%
2329

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
22%10%46%5%24345%29%
47629
Night
21%10%47%6%34446%25%
46505
TransparencyDay
56%49%18%9%
47320
Night
58%6%10%16%7%
46332
SeeingDay
32%15%28%16%6%1
6958
Night
29%13%29%20%6%
14912

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%18%8%11%8%3333414%
1361
16th to endDay
19%15%6%11%9%5%5%335%14%
1728
February1st to 15thDay
16%18%8%12%11%45%5%349%
1575
16th to endDay
13%17%8%12%8%3333421%
1487
March1st to 15thDay
21%13%5%8%7%2332425%
1941
16th to endDay
19%12%6%8%6%23335%28%
2112
April1st to 15thDay
22%14%35%42324431%
2140
16th to endDay
25%7%24323346%35%
2340
May1st to 15thDay
26%9%46%5%23335%29%
2338
16th to endDay
27%8%2441345%7%31%
2618
June1st to 15thDay
28%8%35%5%33336%27%
2619
16th to endDay
24%6%25%32445%6%33%
2700
July1st to 15thDay
22%6%2432445%7%36%
2691
16th to endDay
24%6%345%25%446%31%
2491
August1st to 15thDay
20%6%344245%47%35%
2288
16th to endDay
18%6%24424446%41%
2253
September1st to 15thDay
20%5%24313236%44%
1922
16th to endDay
20%6%23313246%44%
1815
October1st to 15thDay
22%7%15%423346%37%
1658
16th to endDay
25%10%46%42445%5%27%
1738
November1st to 15thDay
23%12%47%434335%27%
1494
16th to endDay
21%15%6%9%6%34335%20%
1440
December1st to 15thDay
26%15%6%9%6%35%335%15%
1440
16th to endDay
25%15%9%9%6%2433414%
1440
January1st to 15thNight
18%14%6%10%9%35%5%45%14%
2571
16th to endNight
18%16%6%12%10%5%5%5%4411%
2496
February1st to 15thNight
17%15%6%13%10%5%5%5%4311%
2285
16th to endNight
14%14%6%10%9%5%6%5%45%17%
1985
March1st to 15thNight
19%11%49%7%34435%25%
1995
16th to endNight
17%9%5%7%5%34445%30%
2112
April1st to 15thNight
25%10%25%5%2435%6%27%
1805
16th to endNight
22%9%35%425%446%31%
1620
May1st to 15thNight
24%11%37%424446%27%
1614
16th to endNight
24%8%26%5%13346%30%
1494
June1st to 15thNight
29%9%45%41445%7%23%
1350
16th to endNight
23%8%26%43445%7%30%
1260
July1st to 15thNight
22%6%25%42446%7%32%
1260
16th to endNight
21%7%47%5%3446%7%27%
1668
August1st to 15thNight
19%8%36%323447%36%
1587
16th to endNight
16%6%25%42346%7%39%
1597
September1st to 15thNight
20%6%24424446%39%
1705
16th to endNight
19%423322246%45%
1815
October1st to 15thNight
21%7%25%5%24345%37%
1972
16th to endNight
24%9%36%324345%31%
2131
November1st to 15thNight
20%10%36%5%345%5%7%25%
2364
16th to endNight
22%12%47%6%34346%24%
2520
December1st to 15thNight
25%12%5%8%6%3445%6%16%
2520
16th to endNight
25%14%7%9%6%2444415%
2779

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
73%5%9%9%2
1362
16th to endDay
73%5%6%11%2
1728
February1st to 15thDay
76%7%7%7%1
1578
16th to endDay
67%49%13%3
1487
March1st to 15thDay
63%39%14%7%
1952
16th to endDay
58%48%18%9%1
2112
April1st to 15thDay
56%48%16%13%1
2140
16th to endDay
49%49%21%13%1
2340
May1st to 15thDay
58%46%18%10%2
2338
16th to endDay
53%412%19%8%
2622
June1st to 15thDay
59%48%17%8%1
2619
16th to endDay
50%6%10%19%12%
2700
July1st to 15thDay
45%5%13%22%11%1
2532
16th to endDay
52%412%20%8%
2335
August1st to 15thDay
47%5%12%21%12%1
2275
16th to endDay
42%5%12%26%12%
2253
September1st to 15thDay
42%310%24%17%1
1922
16th to endDay
40%37%28%18%1
1815
October1st to 15thDay
47%49%23%12%1
1658
16th to endDay
58%410%17%8%
1738
November1st to 15thDay
60%39%18%7%
1494
16th to endDay
66%6%9%12%4
1440
December1st to 15thDay
71%6%8%11%2
1440
16th to endDay
74%46%10%3
1440
January1st to 15thNight
69%8%9%10%2
2571
16th to endNight
73%7%6%9%1
2496
February1st to 15thNight
74%7%7%8%2
2286
16th to endNight
67%6%8%12%4
1985
March1st to 15thNight
61%49%15%8%
2007
16th to endNight
54%5%10%17%11%
2112
April1st to 15thNight
56%48%16%10%2
1805
16th to endNight
51%6%9%19%12%1
1620
May1st to 15thNight
58%47%18%9%
1614
16th to endNight
54%5%12%20%7%
1496
June1st to 15thNight
60%5%9%18%5%
1350
16th to endNight
54%6%11%17%10%
1260
July1st to 15thNight
48%7%15%18%9%
1190
16th to endNight
53%7%12%19%6%
1562
August1st to 15thNight
48%5%11%24%9%
1575
16th to endNight
41%7%12%25%12%
1597
September1st to 15thNight
45%5%9%27%12%1
1705
16th to endNight
40%36%28%19%
1815
October1st to 15thNight
48%411%20%13%1
1972
16th to endNight
53%410%21%9%
2131
November1st to 15thNight
55%7%12%17%6%
2364
16th to endNight
59%7%12%14%5%
2520
December1st to 15thNight
66%7%10%12%2
2520
16th to endNight
70%6%8%10%3
2779

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
33%20%34%8%4
99
16th to endDay
32%19%32%14%1
256
February1st to 15thDay
26%24%33%13%2
236
16th to endDay
24%20%33%16%4
224
March1st to 15thDay
35%21%26%10%6%
270
16th to endDay
34%21%22%12%6%2
288
April1st to 15thDay
32%26%25%9%5%
270
16th to endDay
32%17%31%12%41
270
May1st to 15thDay
36%21%26%10%32
294
16th to endDay
36%13%27%16%5%1
519
June1st to 15thDay
36%12%28%17%4
495
16th to endDay
36%10%24%22%5%1
495
July1st to 15thDay
29%8%27%21%10%1
475
16th to endDay
30%9%27%22%8%1
352
August1st to 15thDay
23%10%33%20%10%2
297
16th to endDay
24%8%26%20%16%2
268
September1st to 15thDay
26%7%33%21%8%2
255
16th to endDay
25%9%32%16%8%6%
254
October1st to 15thDay
27%11%28%18%8%5%
226
16th to endDay
34%17%27%11%8%
240
November1st to 15thDay
29%14%25%19%8%2
235
16th to endDay
34%13%29%13%6%1
240
December1st to 15thDay
38%18%25%12%3
240
16th to endDay
42%24%15%16%
160
January1st to 15thNight
30%18%29%17%3
738
16th to endNight
32%18%29%16%3
768
February1st to 15thNight
30%17%31%18%2
704
16th to endNight
28%17%31%16%6%
631
March1st to 15thNight
28%18%29%18%4
720
16th to endNight
26%16%31%18%6%
768
April1st to 15thNight
35%13%32%16%2
593
16th to endNight
29%13%33%17%5%
540
May1st to 15thNight
31%13%33%17%4
540
16th to endNight
30%8%35%20%4
561
June1st to 15thNight
34%8%30%22%4
450
16th to endNight
29%335%23%8%
360
July1st to 15thNight
24%432%28%10%
340
16th to endNight
23%5%37%26%6%
560
August1st to 15thNight
22%7%26%31%11%
528
16th to endNight
20%433%28%11%
525
September1st to 15thNight
24%8%31%24%11%
550
16th to endNight
23%9%25%25%13%2
657
October1st to 15thNight
27%11%26%23%10%1
660
16th to endNight
31%15%26%21%5%
704
November1st to 15thNight
25%11%29%22%9%
715
16th to endNight
30%17%24%20%6%
750
December1st to 15thNight
38%15%26%17%3
750
16th to endNight
37%18%24%16%2
800
Page generated at 2017-08-13 15:16:31. Version ac04

Copyright 2017 A. Danko


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