Lincoln Ridge Park
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Lincoln Ridge Park clear sky chart from 2005-11-05 to 2017-09-17.

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
42%
15528
19%
46682
13%
15485
47%
15485
23%
31055

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
17%
844
13%
2450
6%
839
25%
839
13%
1903
January16th to endNight
21%
768
14%
2496
7%
768
29%
768
13%
1843
February1st to 15thNight
21%
702
13%
2157
6%
701
27%
701
15%
1561
February16th to endNight
20%
631
14%
1893
7%
631
27%
631
16%
1376
March1st to 15thNight
25%
720
15%
2094
10%
720
29%
720
17%
1493
March16th to endNight
31%
768
15%
2112
8%
768
37%
768
21%
1504
April1st to 15thNight
34%
569
18%
1827
12%
569
44%
569
22%
1192
April16th to endNight
41%
540
21%
1653
11%
540
50%
540
24%
1078
May1st to 15thNight
39%
540
16%
1620
9%
540
45%
540
21%
1141
May16th to endNight
56%
562
18%
1684
14%
561
59%
561
28%
1070
June1st to 15thNight
66%
540
20%
1569
16%
540
69%
540
38%
901
June16th to endNight
64%
540
19%
1440
13%
540
68%
540
37%
897
July1st to 15thNight
60%
510
18%
1363
14%
510
63%
510
33%
872
July16th to endNight
73%
564
20%
1595
17%
531
75%
531
36%
925
August1st to 15thNight
71%
539
23%
1609
20%
536
73%
536
35%
957
August16th to endNight
76%
573
25%
1848
26%
573
77%
573
39%
987
September1st to 15thNight
66%
660
27%
1920
24%
660
69%
660
36%
1126
September16th to endNight
58%
665
28%
1837
21%
665
61%
665
34%
1130
October1st to 15thNight
55%
660
29%
1848
23%
660
61%
660
37%
1085
October16th to endNight
37%
704
23%
2194
17%
704
46%
704
25%
1408
November1st to 15thNight
44%
700
27%
2276
22%
700
54%
700
30%
1329
November16th to endNight
32%
720
18%
2340
14%
720
39%
720
18%
1587
December1st to 15thNight
23%
720
11%
2340
8%
720
27%
720
13%
1760
December16th to endNight
19%
789
13%
2517
6%
789
27%
789
12%
1930

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%7%36%5%3445%7%37%
48071
Night
14%7%35%5%2445%7%39%
46864
Cloud CoverDay
15%7%36%5%3445%7%37%
48080
Night
14%7%35%42445%7%39%
46869
TransparencyDay
45%6%10%20%14%2
47771
Night
44%5%10%21%14%2
46682
SeeingDay
17%8%23%23%17%10%
5640
Night
18%8%25%28%17%2
15531

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
20%11%5%9%434345%26%
1481
16th to endDay
16%12%6%8%5%3343430%
1728
February1st to 15thDay
17%13%5%7%423245%32%
1702
16th to endDay
16%13%5%7%5%3435%5%30%
1580
March1st to 15thDay
22%10%25%423345%32%
1856
16th to endDay
19%10%36%6%2445%5%32%
2112
April1st to 15thDay
18%6%35%434446%38%
2130
16th to endDay
17%6%245%3345%7%38%
2307
May1st to 15thDay
23%7%26%5%245%46%31%
2331
16th to endDay
10%7%36%5%45%5%5%9%35%
2431
June1st to 15thDay
10%426%6%25%5%6%8%41%
2388
16th to endDay
9%425%6%46%6%6%8%39%
2520
July1st to 15thDay
13%7%25%6%35%5%6%9%34%
2514
16th to endDay
8%3245%47%7%6%8%39%
2465
August1st to 15thDay
8%426%6%445%6%10%41%
2340
16th to endDay
7%5%25%436%5%6%9%42%
2352
September1st to 15thDay
13%42443445%6%44%
2028
16th to endDay
15%424423346%46%
1829
October1st to 15thDay
12%5%15%433347%47%
1782
16th to endDay
20%7%25%312326%42%
1675
November1st to 15thDay
9%6%35%323445%49%
1582
16th to endDay
17%10%36%433345%38%
1620
December1st to 15thDay
24%11%47%5%3423427%
1620
16th to endDay
21%14%5%6%5%23346%25%
1698
January1st to 15thNight
18%12%410%7%3444426%
2450
16th to endNight
17%12%48%5%34345%29%
2496
February1st to 15thNight
20%11%47%433345%31%
2155
16th to endNight
18%12%5%7%5%2435%6%29%
1893
March1st to 15thNight
17%11%35%5%3345%5%34%
2081
16th to endNight
16%8%35%5%245%5%7%34%
2112
April1st to 15thNight
14%8%35%42445%6%39%
1827
16th to endNight
14%6%25%5%25%35%8%39%
1653
May1st to 15thNight
17%6%36%5%3446%7%34%
1620
16th to endNight
10%3245%35%5%7%10%41%
1682
June1st to 15thNight
5%33343345%10%51%
1569
16th to endNight
5%2245%25%47%11%46%
1440
July1st to 15thNight
10%425%434348%46%
1443
16th to endNight
7%214435%5%6%9%49%
1703
August1st to 15thNight
6%3145%245%5%9%49%
1620
16th to endNight
43133245%5%10%54%
1848
September1st to 15thNight
11%41321335%7%52%
1920
16th to endNight
12%434423435%50%
1837
October1st to 15thNight
9%413425%45%7%51%
1848
16th to endNight
17%7%245%24335%43%
2194
November1st to 15thNight
13%42442345%6%47%
2276
16th to endNight
19%9%35%43435%5%35%
2340
December1st to 15thNight
23%11%5%8%5%2334427%
2340
16th to endNight
22%14%5%6%5%33345%25%
2517

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
21%11%6%9%434335%26%
1481
16th to endDay
16%12%6%8%5%2434429%
1728
February1st to 15thDay
17%13%5%7%423345%32%
1702
16th to endDay
15%14%5%8%5%2435%5%30%
1580
March1st to 15thDay
23%10%25%423445%32%
1866
16th to endDay
19%11%36%5%2435%5%32%
2111
April1st to 15thDay
18%6%35%424446%38%
2130
16th to endDay
17%7%245%2345%8%38%
2307
May1st to 15thDay
23%6%25%5%35%35%7%31%
2331
16th to endDay
11%6%26%6%36%5%5%9%35%
2431
June1st to 15thDay
11%425%5%25%5%6%8%41%
2388
16th to endDay
9%435%6%46%5%5%8%40%
2520
July1st to 15thDay
13%6%25%6%36%5%6%9%34%
2514
16th to endDay
8%4246%46%7%7%8%39%
2465
August1st to 15thDay
8%426%6%345%6%10%41%
2340
16th to endDay
7%425%435%6%6%9%43%
2352
September1st to 15thDay
13%424435%45%6%44%
2028
16th to endDay
16%424423446%46%
1829
October1st to 15thDay
12%5%25%5%23347%47%
1782
16th to endDay
21%6%25%413336%42%
1675
November1st to 15thDay
9%6%35%423446%48%
1582
16th to endDay
17%10%36%334335%37%
1620
December1st to 15thDay
24%11%47%5%44325%26%
1620
16th to endDay
21%14%5%6%5%23446%25%
1698
January1st to 15thNight
18%12%411%6%3443426%
2450
16th to endNight
17%13%5%7%5%34345%29%
2496
February1st to 15thNight
20%11%5%6%433345%31%
2148
16th to endNight
18%12%47%43435%6%29%
1893
March1st to 15thNight
18%11%35%5%34346%33%
2094
16th to endNight
16%8%35%5%245%5%7%34%
2112
April1st to 15thNight
14%8%345%2345%6%39%
1827
16th to endNight
14%6%35%425%35%8%40%
1653
May1st to 15thNight
18%6%36%6%2445%7%34%
1619
16th to endNight
10%325%5%345%6%10%41%
1682
June1st to 15thNight
6%32443445%10%51%
1569
16th to endNight
6%2145%35%6%7%11%46%
1440
July1st to 15thNight
10%4245%3335%8%47%
1443
16th to endNight
7%2244345%6%10%49%
1703
August1st to 15thNight
6%3145%345%6%9%48%
1620
16th to endNight
43134245%5%10%54%
1848
September1st to 15thNight
12%41331336%7%52%
1920
16th to endNight
12%434424346%49%
1837
October1st to 15thNight
9%41342445%7%51%
1848
16th to endNight
17%6%25%424345%42%
2194
November1st to 15thNight
14%42332345%6%47%
2276
16th to endNight
19%9%25%43335%5%35%
2340
December1st to 15thNight
22%11%5%8%5%3334427%
2340
16th to endNight
22%14%5%6%5%24345%25%
2517

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
61%48%14%10%
1482
16th to endDay
56%411%20%6%
1728
February1st to 15thDay
54%410%20%9%
1704
16th to endDay
55%410%21%7%
1580
March1st to 15thDay
54%5%11%19%8%1
1866
16th to endDay
53%5%9%20%9%
2112
April1st to 15thDay
45%5%9%23%14%1
2130
16th to endDay
43%5%9%22%13%4
2307
May1st to 15thDay
52%7%11%16%10%1
2331
16th to endDay
43%9%13%19%12%1
2435
June1st to 15thDay
38%7%12%22%17%1
2388
16th to endDay
40%8%11%19%16%3
2520
July1st to 15thDay
44%7%11%16%17%2
2365
16th to endDay
37%11%13%21%13%2
2310
August1st to 15thDay
36%7%13%23%16%2
2327
16th to endDay
35%7%13%22%16%4
2352
September1st to 15thDay
39%5%11%18%19%5%
2028
16th to endDay
39%5%8%20%24%1
1829
October1st to 15thDay
37%49%25%19%3
1782
16th to endDay
43%311%25%14%2
1675
November1st to 15thDay
36%47%24%20%5%
1582
16th to endDay
48%47%22%15%
1620
December1st to 15thDay
61%39%15%8%
1620
16th to endDay
60%410%15%7%
1698
January1st to 15thNight
61%46%16%9%
2450
16th to endNight
57%49%19%7%1
2496
February1st to 15thNight
56%311%20%7%1
2157
16th to endNight
54%412%19%8%
1893
March1st to 15thNight
52%5%8%20%11%1
2094
16th to endNight
48%6%13%21%9%
2112
April1st to 15thNight
43%5%9%21%17%2
1827
16th to endNight
43%49%20%13%7%
1653
May1st to 15thNight
47%7%11%21%9%1
1620
16th to endNight
34%10%13%20%16%4
1684
June1st to 15thNight
28%7%13%28%18%3
1569
16th to endNight
29%9%15%20%20%3
1440
July1st to 15thNight
36%5%11%22%18%5%
1363
16th to endNight
27%9%14%27%18%2
1595
August1st to 15thNight
30%8%14%25%18%3
1609
16th to endNight
24%7%14%28%20%4
1848
September1st to 15thNight
30%7%9%24%22%5%
1920
16th to endNight
35%47%21%28%2
1837
October1st to 15thNight
30%5%10%27%21%4
1848
16th to endNight
42%48%25%16%2
2194
November1st to 15thNight
35%310%21%23%5%
2276
16th to endNight
50%310%20%14%1
2340
December1st to 15thNight
59%49%15%8%
2340
16th to endNight
61%410%15%7%
2517

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
31%23%32%8%22
90
16th to endDay
22%29%37%8%2
96
February1st to 15thDay
21%35%31%10%2
90
16th to endDay
22%11%50%14%1
81
March1st to 15thDay
30%17%29%21%
156
16th to endDay
24%12%34%18%9%
288
April1st to 15thDay
22%14%27%21%12%2
270
16th to endDay
17%11%28%19%14%7%
270
May1st to 15thDay
26%10%29%17%9%7%
288
16th to endDay
17%6%23%23%14%13%
331
June1st to 15thDay
10%317%35%22%10%
363
16th to endDay
13%424%32%17%8%
495
July1st to 15thDay
17%319%27%21%10%
469
16th to endDay
11%19%29%23%25%
326
August1st to 15thDay
13%110%24%25%24%
313
16th to endDay
7%112%26%34%18%
332
September1st to 15thDay
14%313%23%27%16%
315
16th to endDay
18%316%17%27%16%
259
October1st to 15thDay
12%6%21%30%18%10%
255
16th to endDay
18%8%32%26%14%
187
November1st to 15thDay
12%10%27%25%15%8%
90
16th to endDay
26%16%32%20%4
90
December1st to 15thDay
23%18%34%16%6%
90
16th to endDay
31%25%36%6%1
96
January1st to 15thNight
24%16%35%18%4
844
16th to endNight
25%16%32%23%1
768
February1st to 15thNight
25%13%35%23%1
704
16th to endNight
25%13%36%23%1
631
March1st to 15thNight
24%13%31%25%5%
720
16th to endNight
19%10%33%25%10%
768
April1st to 15thNight
18%13%29%28%9%
569
16th to endNight
17%8%29%31%12%1
540
May1st to 15thNight
20%6%27%30%13%1
540
16th to endNight
11%121%35%23%5%
563
June1st to 15thNight
8%118%41%26%2
540
16th to endNight
6%218%41%29%2
540
July1st to 15thNight
13%113%35%30%4
510
16th to endNight
8%10%32%41%6%
564
August1st to 15thNight
7%10%36%38%6%
539
16th to endNight
5%9%33%42%7%
573
September1st to 15thNight
12%212%30%34%6%
660
16th to endNight
13%316%27%32%5%
665
October1st to 15thNight
11%5%21%32%23%5%
660
16th to endNight
20%8%28%28%13%1
704
November1st to 15thNight
16%10%25%25%20%2
700
16th to endNight
26%11%25%26%9%
720
December1st to 15thNight
29%11%28%20%8%
720
16th to endNight
29%14%31%20%3
789
Page generated at 2017-09-18 08:38:21. Version ac04

Copyright 2017 A. Danko


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