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 2017-12-02.

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
43%
16129
21%
47788
14%
16082
50%
16082
27%
30347

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
44%
540
17%
1652
12%
539
50%
539
24%
1100
May16th to endNight
54%
563
20%
1514
14%
561
57%
561
30%
1016
June1st to 15thNight
65%
540
22%
1440
16%
540
68%
540
41%
851
June16th to endNight
65%
540
22%
1440
17%
540
68%
540
40%
861
July1st to 15thNight
71%
510
20%
1360
16%
510
72%
510
41%
812
July16th to endNight
76%
564
23%
1434
20%
531
78%
531
43%
829
August1st to 15thNight
78%
539
22%
1724
26%
536
78%
536
38%
947
August16th to endNight
75%
573
25%
1910
29%
573
77%
573
36%
1042
September1st to 15thNight
68%
540
27%
1800
29%
540
72%
540
34%
1009
September16th to endNight
61%
696
33%
1959
25%
696
66%
696
38%
1136
October1st to 15thNight
55%
720
28%
2100
21%
720
60%
720
35%
1231
October16th to endNight
38%
768
27%
2363
19%
768
48%
768
30%
1401
November1st to 15thNight
40%
760
27%
2471
18%
760
53%
760
31%
1408
November16th to endNight
33%
780
24%
2535
16%
780
45%
780
26%
1549
December1st to 15thNight
29%
894
15%
2531
8%
894
35%
894
20%
1809
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%25%5%3445%7%42%
48668
Night
13%6%25%424447%44%
47965
TransparencyDay
39%6%12%23%14%2
48348
Night
39%5%11%23%16%3
47790
SeeingDay
13%5%21%27%22%10%
6096
Night
16%7%27%30%16%1
16129

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%3445%8%36%
2298
16th to endDay
10%5%25%6%36%6%6%7%40%
2597
June1st to 15thDay
6%4245%35%6%6%7%47%
2520
16th to endDay
6%325%435%6%6%10%45%
2520
July1st to 15thDay
8%4245%36%46%9%43%
2520
16th to endDay
42135%35%5%7%10%48%
2634
August1st to 15thDay
6%325%5%35%6%7%11%42%
2226
16th to endDay
6%4245%346%7%8%45%
2292
September1st to 15thDay
10%5%35%5%34447%45%
2160
16th to endDay
9%3145%3445%7%49%
1989
October1st to 15thDay
12%6%25%423347%48%
1857
16th to endDay
14%42331435%6%50%
1860
November1st to 15thDay
12%5%25%324345%50%
1717
16th to endDay
17%7%245%13335%43%
1755
December1st to 15thDay
17%10%45%33445%6%35%
1463
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%25%5%33446%40%
1652
16th to endNight
7%425%5%35%5%6%10%42%
1513
June1st to 15thNight
7%31443445%8%53%
1440
16th to endNight
6%3134345%5%10%49%
1440
July1st to 15thNight
9%2243135%5%8%53%
1440
16th to endNight
43135%3445%11%52%
1531
August1st to 15thNight
5%2143345%7%8%52%
1734
16th to endNight
6%3244245%6%9%51%
1910
September1st to 15thNight
9%42442435%7%51%
1800
16th to endNight
9%5%24323337%54%
1959
October1st to 15thNight
11%5%13423336%52%
2100
16th to endNight
16%423313335%51%
2363
November1st to 15thNight
11%424323446%50%
2471
16th to endNight
17%6%34322346%46%
2535
December1st to 15thNight
21%9%46%423346%32%
2531
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
44%7%14%23%9%
2298
16th to endDay
40%9%13%18%14%2
2601
June1st to 15thDay
31%8%15%23%17%2
2520
16th to endDay
32%9%15%21%17%3
2520
July1st to 15thDay
35%8%12%25%14%4
2371
16th to endDay
27%10%15%27%16%2
2468
August1st to 15thDay
33%8%13%26%17%1
2212
16th to endDay
32%9%15%20%17%4
2292
September1st to 15thDay
37%6%9%21%20%4
2160
16th to endDay
34%49%26%21%3
1989
October1st to 15thDay
36%411%24%19%3
1857
16th to endDay
33%410%30%18%2
1860
November1st to 15thDay
36%311%24%18%6%
1717
16th to endDay
43%49%27%13%2
1755
December1st to 15thDay
49%5%13%20%10%
1463
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
43%6%11%22%14%
1653
16th to endNight
36%9%12%20%16%4
1515
June1st to 15thNight
28%5%12%27%22%1
1440
16th to endNight
29%6%14%22%20%6%
1440
July1st to 15thNight
28%6%12%29%16%6%
1360
16th to endNight
25%6%15%31%17%2
1434
August1st to 15thNight
25%8%15%24%23%3
1724
16th to endNight
27%7%12%22%24%5%
1910
September1st to 15thNight
32%49%26%20%7%
1800
16th to endNight
30%47%25%25%6%
1959
October1st to 15thNight
33%410%23%22%6%
2100
16th to endNight
35%48%27%19%4
2363
November1st to 15thNight
33%310%22%22%6%
2471
16th to endNight
40%39%25%19%1
2535
December1st to 15thNight
52%311%20%11%
2531
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%10%25%31%11%5%
288
16th to endDay
10%5%29%28%16%9%
497
June1st to 15thDay
8%216%30%28%12%
495
16th to endDay
8%324%33%22%7%
495
July1st to 15thDay
11%213%33%24%14%
475
16th to endDay
5%8%29%35%20%
515
August1st to 15thDay
10%18%24%34%21%
379
16th to endDay
9%10%24%38%16%
332
September1st to 15thDay
11%213%20%34%17%
315
16th to endDay
10%311%26%29%17%
314
October1st to 15thDay
12%5%20%34%22%3
192
16th to endDay
15%9%28%29%15%2
144
November1st to 15thDay
12%7%27%23%17%11%
135
16th to endDay
28%9%31%21%8%1
135
December1st to 15thDay
18%12%30%22%7%8%
94
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%426%35%14%1
540
16th to endNight
8%225%37%23%2
563
June1st to 15thNight
9%217%41%28%1
540
16th to endNight
7%117%43%27%1
540
July1st to 15thNight
10%19%40%35%3
510
16th to endNight
49%36%43%6%
564
August1st to 15thNight
6%7%36%41%7%
539
16th to endNight
7%8%36%42%5%
573
September1st to 15thNight
10%112%35%32%7%
540
16th to endNight
11%316%30%30%7%
696
October1st to 15thNight
12%323%32%23%4
720
16th to endNight
19%7%32%28%11%
768
November1st to 15thNight
13%6%34%31%13%
760
16th to endNight
21%9%32%26%9%
780
December1st to 15thNight
26%9%31%25%6%
894
16th to endNight
26%9%33%26%3
960
Page generated at 2017-12-03 10:16:42. Version ac04

Copyright 2017 A. Danko


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