Carlyle Lake
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Carlyle Lake clear sky chart from 2005-11-05 to 2017-05-01.

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
43%
15413
21%
45651
14%
15366
49%
15366
27%
29140

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
24%
900
18%
2506
7%
895
33%
895
21%
1725
January16th to endNight
24%
960
18%
2529
7%
960
32%
960
23%
1801
February1st to 15thNight
24%
785
15%
2193
5%
782
31%
782
20%
1543
February16th to endNight
24%
631
19%
1893
7%
631
35%
631
21%
1272
March1st to 15thNight
25%
711
16%
2151
8%
711
31%
711
20%
1479
March16th to endNight
34%
576
15%
1998
11%
576
41%
576
19%
1330
April1st to 15thNight
33%
539
21%
1797
13%
539
46%
539
25%
1099
April16th to endNight
40%
540
21%
1800
17%
540
48%
540
25%
1136
May1st to 15thNight
43%
498
18%
1524
13%
497
49%
497
23%
1026
May16th to endNight
54%
515
18%
1385
13%
513
57%
513
30%
936
June1st to 15thNight
64%
495
23%
1320
17%
495
67%
495
38%
798
June16th to endNight
65%
495
20%
1320
16%
495
67%
495
39%
800
July1st to 15thNight
71%
465
21%
1240
17%
465
72%
465
39%
749
July16th to endNight
77%
522
21%
1320
18%
489
78%
489
42%
767
August1st to 15thNight
79%
494
24%
1579
28%
491
80%
491
40%
849
August16th to endNight
75%
525
23%
1750
28%
525
77%
525
35%
969
September1st to 15thNight
68%
495
28%
1650
30%
495
72%
495
34%
929
September16th to endNight
60%
638
31%
1796
23%
638
65%
638
37%
1054
October1st to 15thNight
55%
660
29%
1925
22%
660
61%
660
36%
1112
October16th to endNight
39%
704
25%
2166
18%
704
48%
704
29%
1292
November1st to 15thNight
41%
700
28%
2276
18%
700
54%
700
33%
1259
November16th to endNight
33%
720
22%
2340
16%
720
42%
720
24%
1460
December1st to 15thNight
28%
885
15%
2505
8%
885
35%
885
19%
1794
December16th to endNight
24%
960
16%
2688
6%
960
33%
960
19%
1961

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
12%5%35%5%3445%7%41%
46117
Night
13%6%35%424447%43%
45828
TransparencyDay
40%6%12%23%14%2
45797
Night
40%5%11%23%16%3
45653
SeeingDay
13%5%21%26%22%10%
5223
Night
16%7%27%30%16%1
15413

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%8%37%5%34445%35%
1432
16th to endDay
12%8%46%6%34346%39%
1692
February1st to 15thDay
15%8%5%5%5%24446%36%
1669
16th to endDay
11%8%47%5%25%5%5%5%37%
1580
March1st to 15thDay
17%8%35%5%24346%38%
1818
16th to endDay
17%8%35%6%35%45%6%32%
2222
April1st to 15thDay
16%4243335%5%7%44%
2151
16th to endDay
16%6%25%5%34447%38%
2160
May1st to 15thDay
17%5%345%3446%8%34%
2107
16th to endDay
10%5%35%6%35%5%6%7%39%
2375
June1st to 15thDay
7%4245%35%6%6%8%45%
2310
16th to endDay
6%325%5%35%6%7%10%43%
2310
July1st to 15thDay
8%425%5%36%5%7%9%42%
2310
16th to endDay
42145%35%6%7%11%46%
2440
August1st to 15thDay
6%315%6%35%6%7%11%42%
2041
16th to endDay
7%3245%346%7%8%45%
2100
September1st to 15thDay
10%6%35%5%3445%8%43%
1980
16th to endDay
10%41443445%7%48%
1823
October1st to 15thDay
12%5%24323347%50%
1702
16th to endDay
14%42331435%6%51%
1705
November1st to 15thDay
11%5%2432435%6%51%
1582
16th to endDay
18%7%25%5%13335%42%
1620
December1st to 15thDay
17%10%45%33445%6%34%
1452
16th to endDay
18%10%45%423346%35%
1536
January1st to 15thNight
15%8%37%5%34346%37%
2506
16th to endNight
13%10%5%6%424346%36%
2529
February1st to 15thNight
15%8%47%5%245%5%5%35%
2184
16th to endNight
14%8%36%5%33345%40%
1893
March1st to 15thNight
18%9%26%5%23335%38%
2151
16th to endNight
17%6%35%5%25%45%8%35%
1998
April1st to 15thNight
14%4245%3435%5%46%
1797
16th to endNight
16%5%25%3235%47%42%
1800
May1st to 15thNight
16%6%35%5%34446%39%
1524
16th to endNight
8%425%5%35%5%6%10%42%
1384
June1st to 15thNight
7%41443445%8%50%
1320
16th to endNight
6%423435%5%6%9%48%
1320
July1st to 15thNight
9%2243235%5%7%53%
1320
16th to endNight
33135%3445%12%51%
1417
August1st to 15thNight
5%2143245%6%9%54%
1589
16th to endNight
6%3244245%6%9%51%
1750
September1st to 15thNight
9%42442435%7%50%
1650
16th to endNight
10%5%24323346%53%
1796
October1st to 15thNight
11%413423336%53%
1925
16th to endNight
16%5%2331333451%
2166
November1st to 15thNight
10%424323446%52%
2276
16th to endNight
18%6%34322336%44%
2340
December1st to 15thNight
21%9%46%423346%32%
2505
16th to endNight
21%9%46%334336%33%
2688

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
50%5%11%21%11%1
1433
16th to endDay
45%413%26%9%
1692
February1st to 15thDay
47%5%12%24%8%1
1671
16th to endDay
48%5%12%21%11%1
1580
March1st to 15thDay
47%5%11%23%10%2
1818
16th to endDay
51%7%14%19%7%
2224
April1st to 15thDay
38%6%11%25%15%1
2151
16th to endDay
45%6%11%24%10%1
2160
May1st to 15thDay
45%7%14%22%8%
2107
16th to endDay
41%10%14%17%14%3
2379
June1st to 15thDay
33%9%16%23%15%1
2310
16th to endDay
33%9%15%20%16%3
2310
July1st to 15thDay
36%8%12%24%14%4
2161
16th to endDay
28%10%15%28%14%1
2274
August1st to 15thDay
33%8%13%25%17%1
2027
16th to endDay
33%9%14%20%17%5%
2100
September1st to 15thDay
39%6%9%20%19%4
1980
16th to endDay
35%49%26%20%3
1823
October1st to 15thDay
34%411%25%20%4
1702
16th to endDay
32%411%30%18%3
1705
November1st to 15thDay
35%311%24%19%6%
1582
16th to endDay
44%410%26%12%2
1620
December1st to 15thDay
49%5%13%20%10%
1452
16th to endDay
50%412%21%9%1
1536
January1st to 15thNight
47%410%22%14%1
2506
16th to endNight
47%412%22%10%
2529
February1st to 15thNight
48%5%11%21%12%1
2193
16th to endNight
46%413%22%12%
1893
March1st to 15thNight
48%49%20%12%2
2151
16th to endNight
46%6%13%21%10%1
1998
April1st to 15thNight
39%410%24%18%3
1797
16th to endNight
40%5%9%25%14%3
1800
May1st to 15thNight
44%6%12%21%14%
1525
16th to endNight
37%9%12%19%15%4
1386
June1st to 15thNight
30%5%13%28%19%1
1320
16th to endNight
30%6%15%22%18%6%
1320
July1st to 15thNight
29%7%12%27%17%5%
1240
16th to endNight
26%6%16%31%16%1
1320
August1st to 15thNight
24%7%15%25%24%2
1579
16th to endNight
27%7%12%22%23%5%
1750
September1st to 15thNight
32%49%26%20%7%
1650
16th to endNight
31%47%23%25%6%
1796
October1st to 15thNight
32%310%23%23%6%
1925
16th to endNight
36%48%27%19%4
2166
November1st to 15thNight
31%311%22%23%6%
2276
16th to endNight
42%39%24%18%1
2340
December1st to 15thNight
52%311%20%10%
2505
16th to endNight
53%312%19%9%1
2688

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%11%36%13%41
90
16th to endDay
12%27%36%22%1
96
February1st to 15thDay
24%12%42%16%4
90
16th to endDay
19%20%27%24%7%
81
March1st to 15thDay
33%10%37%10%8%
90
16th to endDay
23%11%32%24%8%
208
April1st to 15thDay
15%13%28%24%16%1
270
16th to endDay
19%8%27%25%14%4
270
May1st to 15thDay
15%9%25%32%11%5%
229
16th to endDay
11%5%26%26%18%10%
419
June1st to 15thDay
10%317%29%26%12%
420
16th to endDay
8%221%33%25%9%
420
July1st to 15thDay
12%213%32%23%15%
400
16th to endDay
5%8%30%35%19%
445
August1st to 15thDay
10%7%23%34%23%
314
16th to endDay
7%10%23%37%19%
268
September1st to 15thDay
11%212%20%34%18%
255
16th to endDay
12%313%22%29%16%
254
October1st to 15thDay
10%221%34%26%3
142
16th to endDay
14%430%34%14%2
96
November1st to 15thDay
5%8%23%23%24%14%
90
16th to endDay
34%13%26%17%6%1
90
December1st to 15thDay
18%13%32%23%5%6%
90
16th to endDay
28%11%44%12%3
96
January1st to 15thNight
19%15%35%24%5%
900
16th to endNight
19%13%37%26%2
960
February1st to 15thNight
19%13%37%27%2
785
16th to endNight
18%11%40%26%2
631
March1st to 15thNight
23%12%35%24%4
711
16th to endNight
19%7%32%29%10%
576
April1st to 15thNight
16%11%34%26%10%
539
16th to endNight
18%432%29%13%1
540
May1st to 15thNight
16%427%36%14%
498
16th to endNight
9%125%35%25%2
515
June1st to 15thNight
9%217%41%27%1
495
16th to endNight
8%115%43%29%1
495
July1st to 15thNight
10%19%39%35%3
465
16th to endNight
49%36%43%6%
522
August1st to 15thNight
5%6%37%42%7%
494
16th to endNight
7%8%34%43%5%
525
September1st to 15thNight
10%112%35%33%7%
495
16th to endNight
11%415%29%29%8%
638
October1st to 15thNight
12%323%31%23%5%
660
16th to endNight
19%7%30%29%11%
704
November1st to 15thNight
12%6%35%31%13%1
700
16th to endNight
22%9%32%25%9%
720
December1st to 15thNight
26%9%32%24%6%
885
16th to endNight
26%9%33%26%3
960
Page generated at 2017-05-02 07:43:27. Version ac04

Copyright 2017 A. Danko


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