Laurel Highlands Star Cruise
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Laurel Highlands Star Cruise clear sky chart from 2005-11-05 to 2017-03-13.

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
25%
14685
14%
45220
7%
14646
33%
14646
14%
32696

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
7%
716
10%
2327
3%
716
15%
716
5%
1910
January16th to endNight
6%
768
8%
2496
1%
768
15%
768
5%
2027
February1st to 15thNight
9%
704
9%
2287
3%
701
16%
701
7%
1780
February16th to endNight
7%
631
11%
1933
2%
631
18%
631
6%
1543
March1st to 15thNight
14%
712
13%
1958
6%
712
21%
712
11%
1526
March16th to endNight
15%
704
16%
1936
6%
704
24%
704
13%
1422
April1st to 15thNight
16%
658
13%
1687
4%
658
22%
658
14%
1283
April16th to endNight
26%
577
16%
1567
5%
577
33%
577
17%
1105
May1st to 15thNight
26%
495
14%
1485
4%
495
34%
495
14%
1083
May16th to endNight
39%
433
15%
1460
9%
433
46%
433
18%
928
June1st to 15thNight
36%
330
16%
1320
14%
330
45%
330
17%
824
June16th to endNight
39%
330
14%
1320
11%
330
48%
330
17%
818
July1st to 15thNight
44%
412
11%
1342
10%
412
47%
412
19%
898
July16th to endNight
47%
522
12%
1469
9%
489
53%
489
25%
936
August1st to 15thNight
51%
494
17%
1474
12%
491
56%
491
25%
935
August16th to endNight
59%
610
21%
1660
14%
610
62%
610
33%
1021
September1st to 15thNight
48%
660
23%
1682
13%
660
52%
660
28%
1126
September16th to endNight
45%
657
21%
1827
16%
657
49%
657
27%
1176
October1st to 15thNight
36%
660
20%
1980
15%
660
45%
660
22%
1284
October16th to endNight
22%
704
18%
2112
7%
704
34%
704
15%
1490
November1st to 15thNight
27%
700
21%
2182
12%
700
39%
700
19%
1458
November16th to endNight
14%
720
12%
2520
4%
720
25%
720
8%
1882
December1st to 15thNight
12%
720
7%
2520
4%
720
16%
720
5%
2061
December16th to endNight
6%
768
9%
2676
1%
768
16%
768
4%
2180

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
17%10%47%6%3445%6%28%
45441
Night
15%11%47%5%34446%32%
45413
Cloud CoverDay
18%10%47%5%34446%29%
45451
Night
16%11%47%5%24446%32%
45417
TransparencyDay
54%6%10%17%9%1
45152
Night
52%6%10%18%10%1
45220
SeeingDay
23%21%20%18%10%5%
4758
Night
20%29%21%18%9%1
14691

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
18%14%7%15%7%3434416%
1611
16th to endDay
15%19%8%10%6%4323420%
1728
February1st to 15thDay
17%15%7%12%6%34435%19%
1575
16th to endDay
15%18%7%13%5%1433421%
1536
March1st to 15thDay
17%14%7%6%5%24345%27%
1938
16th to endDay
20%13%5%6%5%2435%6%27%
1936
April1st to 15thDay
17%13%5%6%434336%31%
1930
16th to endDay
20%9%35%5%24345%35%
2073
May1st to 15thDay
21%8%36%6%45%5%5%6%25%
2136
16th to endDay
18%5%35%7%345%5%8%32%
2303
June1st to 15thDay
17%6%15%6%35%5%5%10%32%
2310
16th to endDay
17%6%37%5%35%6%6%9%27%
2310
July1st to 15thDay
17%6%36%7%46%5%5%8%29%
2195
16th to endDay
14%6%37%7%36%6%6%9%28%
2283
August1st to 15thDay
14%7%26%6%46%7%8%9%26%
2145
16th to endDay
13%6%25%6%35%5%7%8%34%
2179
September1st to 15thDay
17%7%2443445%6%39%
1946
16th to endDay
18%7%25%5%34335%37%
1801
October1st to 15thDay
21%7%246%2335%6%36%
1650
16th to endDay
21%13%26%323335%34%
1760
November1st to 15thDay
13%14%25%423445%38%
1671
16th to endDay
20%16%6%6%5%23345%25%
1440
December1st to 15thDay
21%17%9%11%6%2232319%
1440
16th to endDay
21%18%10%9%6%2323417%
1545
January1st to 15thNight
19%15%8%12%6%3343318%
2327
16th to endNight
15%18%8%11%7%4332420%
2496
February1st to 15thNight
14%15%7%10%7%35%335%23%
2285
16th to endNight
13%16%7%12%7%36%34421%
1933
March1st to 15thNight
18%13%6%8%5%3444427%
1946
16th to endNight
19%12%36%423446%32%
1936
April1st to 15thNight
17%12%5%6%43344432%
1687
16th to endNight
15%9%36%424347%38%
1567
May1st to 15thNight
18%7%26%5%35%5%5%8%30%
1485
16th to endNight
13%6%15%4235%5%9%41%
1458
June1st to 15thNight
10%5%35%5%35%46%10%39%
1320
16th to endNight
12%5%25%435%46%9%40%
1320
July1st to 15thNight
13%7%35%4245%6%8%38%
1432
16th to endNight
11%4235%446%6%9%41%
1577
August1st to 15thNight
8%5%245%26%7%7%9%40%
1485
16th to endNight
9%4244245%47%50%
1660
September1st to 15thNight
13%425%43445%5%45%
1682
16th to endNight
14%5%24434447%44%
1827
October1st to 15thNight
18%415%42345%6%41%
1980
16th to endNight
23%10%23425%345%34%
2112
November1st to 15thNight
17%11%34323345%40%
2182
16th to endNight
15%15%6%7%6%2444427%
2520
December1st to 15thNight
21%16%8%12%5%24335%17%
2520
16th to endNight
17%18%9%10%5%23335%19%
2676

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
18%13%8%15%6%3334416%
1611
16th to endDay
15%19%7%10%6%3423320%
1728
February1st to 15thDay
17%15%7%11%7%35%345%18%
1575
16th to endDay
15%18%8%11%5%2343421%
1536
March1st to 15thDay
18%14%7%6%5%2433427%
1949
16th to endDay
20%14%5%6%5%23347%26%
1935
April1st to 15thDay
18%13%46%424335%31%
1930
16th to endDay
21%8%35%5%24335%34%
2073
May1st to 15thDay
23%8%36%6%35%5%5%6%25%
2136
16th to endDay
18%6%25%6%3446%8%32%
2303
June1st to 15thDay
18%4246%35%5%6%9%32%
2310
16th to endDay
18%6%36%6%35%6%6%9%27%
2310
July1st to 15thDay
17%6%36%7%35%5%5%7%29%
2195
16th to endDay
16%5%36%6%36%6%6%9%28%
2283
August1st to 15thDay
15%7%35%6%5%5%7%7%9%27%
2145
16th to endDay
15%5%246%35%6%6%8%34%
2179
September1st to 15thDay
18%6%24424447%40%
1946
16th to endDay
19%7%25%5%24445%37%
1801
October1st to 15thDay
22%7%15%43335%6%36%
1650
16th to endDay
22%14%24413235%34%
1760
November1st to 15thDay
14%14%25%423445%38%
1671
16th to endDay
21%15%6%6%42343426%
1440
December1st to 15thDay
22%17%8%11%5%2222419%
1440
16th to endDay
20%19%10%10%5%2323417%
1545
January1st to 15thNight
19%15%8%13%6%3333318%
2327
16th to endNight
14%19%9%11%7%4322420%
2496
February1st to 15thNight
14%15%7%10%7%45%34423%
2278
16th to endNight
13%15%7%12%7%35%44421%
1933
March1st to 15thNight
18%12%6%8%5%34345%26%
1958
16th to endNight
19%12%46%424346%31%
1936
April1st to 15thNight
18%12%46%5%3444432%
1687
16th to endNight
15%8%36%5%23446%39%
1567
May1st to 15thNight
20%7%25%5%345%5%8%30%
1484
16th to endNight
14%5%2442346%9%41%
1458
June1st to 15thNight
11%5%345%36%5%5%9%40%
1320
16th to endNight
12%5%35%5%2446%9%39%
1320
July1st to 15thNight
14%6%25%425%5%6%7%38%
1432
16th to endNight
12%4235%35%5%6%9%41%
1577
August1st to 15thNight
9%4245%35%6%7%9%40%
1485
16th to endNight
9%415%424447%51%
1660
September1st to 15thNight
13%42443445%446%
1682
16th to endNight
15%424424437%44%
1827
October1st to 15thNight
18%42443345%7%40%
1980
16th to endNight
23%9%24325%445%34%
2112
November1st to 15thNight
17%11%24314336%40%
2182
16th to endNight
15%15%6%8%6%24345%27%
2520
December1st to 15thNight
21%16%8%12%5%2423417%
2520
16th to endNight
18%19%8%10%5%23335%19%
2676

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
69%5%8%11%31
1612
16th to endDay
68%38%14%4
1728
February1st to 15thDay
66%5%10%12%4
1577
16th to endDay
65%5%8%13%6%
1536
March1st to 15thDay
58%5%11%16%7%
1949
16th to endDay
57%5%10%17%8%
1936
April1st to 15thDay
53%6%8%17%12%1
1930
16th to endDay
51%47%18%14%2
2073
May1st to 15thDay
57%8%8%16%8%
2136
16th to endDay
49%8%12%19%7%1
2307
June1st to 15thDay
47%9%12%20%9%
2310
16th to endDay
51%10%11%18%7%1
2310
July1st to 15thDay
53%7%9%16%11%1
2056
16th to endDay
49%8%12%18%10%1
2128
August1st to 15thDay
49%10%11%19%8%
2132
16th to endDay
44%8%11%22%10%2
2179
September1st to 15thDay
44%5%9%21%16%1
1946
16th to endDay
47%47%22%15%
1801
October1st to 15thDay
47%7%10%21%12%1
1650
16th to endDay
53%410%20%11%
1760
November1st to 15thDay
47%49%17%14%6%
1671
16th to endDay
60%49%14%11%
1440
December1st to 15thDay
69%47%11%5%1
1440
16th to endDay
71%48%10%5%
1545
January1st to 15thNight
69%38%9%6%2
2327
16th to endNight
68%39%12%4
2496
February1st to 15thNight
62%5%10%14%7%
2287
16th to endNight
63%6%8%14%6%
1933
March1st to 15thNight
58%6%9%18%5%1
1958
16th to endNight
53%410%20%9%1
1936
April1st to 15thNight
54%5%9%16%12%1
1687
16th to endNight
46%6%10%17%14%5%
1567
May1st to 15thNight
49%10%11%17%10%
1485
16th to endNight
38%8%17%22%11%1
1460
June1st to 15thNight
39%9%14%25%10%
1320
16th to endNight
39%8%15%22%11%1
1320
July1st to 15thNight
42%9%13%19%12%2
1342
16th to endNight
35%10%14%23%13%2
1469
August1st to 15thNight
36%9%17%22%13%
1474
16th to endNight
32%6%12%30%14%2
1660
September1st to 15thNight
37%8%12%19%19%2
1682
16th to endNight
40%411%24%19%
1827
October1st to 15thNight
41%6%12%23%15%2
1980
16th to endNight
50%49%23%10%
2112
November1st to 15thNight
46%49%18%15%6%
2182
16th to endNight
58%5%8%14%11%1
2520
December1st to 15thNight
70%38%10%5%1
2520
16th to endNight
68%5%9%11%3
2676

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
32%36%17%6%5%1
90
16th to endDay
46%25%19%8%
96
February1st to 15thDay
34%44%21%
90
16th to endDay
35%30%26%5%
123
March1st to 15thDay
27%34%21%12%3
259
16th to endDay
28%34%17%12%42
224
April1st to 15thDay
25%30%21%14%7%
210
16th to endDay
23%27%23%10%9%5%
210
May1st to 15thDay
30%27%16%13%7%3
228
16th to endDay
21%19%19%20%11%7%
267
June1st to 15thDay
17%20%23%21%12%3
255
16th to endDay
21%21%23%18%12%2
255
July1st to 15thDay
24%14%19%23%9%8%
245
16th to endDay
11%14%22%24%17%9%
270
August1st to 15thDay
15%11%18%26%18%9%
253
16th to endDay
15%8%16%23%17%18%
268
September1st to 15thDay
16%8%19%25%17%12%
255
16th to endDay
20%14%18%16%22%7%
254
October1st to 15thDay
21%14%22%25%15%1
255
16th to endDay
27%23%25%16%5%1
272
November1st to 15thDay
20%19%21%24%12%2
194
16th to endDay
33%36%10%10%8%1
60
December1st to 15thDay
45%26%16%5%15%
60
16th to endDay
46%20%26%7%
65
January1st to 15thNight
26%40%22%7%2
720
16th to endNight
24%45%21%9%
768
February1st to 15thNight
24%40%23%11%
704
16th to endNight
22%42%24%9%
631
March1st to 15thNight
24%35%22%13%3
712
16th to endNight
22%35%23%12%5%
704
April1st to 15thNight
19%37%24%15%3
658
16th to endNight
17%29%22%20%9%
577
May1st to 15thNight
21%26%22%20%8%
495
16th to endNight
14%24%16%25%17%1
435
June1st to 15thNight
10%23%27%25%12%
330
16th to endNight
11%22%23%30%11%
330
July1st to 15thNight
14%14%20%28%19%2
412
16th to endNight
11%20%15%26%22%4
522
August1st to 15thNight
10%12%18%34%21%2
494
16th to endNight
9%12%12%34%26%3
610
September1st to 15thNight
12%14%20%28%20%3
660
16th to endNight
17%15%18%22%22%3
657
October1st to 15thNight
18%17%23%23%15%1
660
16th to endNight
27%24%23%18%5%
704
November1st to 15thNight
19%27%22%19%10%1
700
16th to endNight
25%36%20%14%3
720
December1st to 15thNight
30%35%17%13%3
720
16th to endNight
26%42%21%8%1
768
Page generated at 2017-03-14 04:34:47. Version ac04

Copyright 2017 A. Danko


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