Pine Mountain State Resort Park
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Pine Mountain State Resort Park 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
47%
15795
20%
47850
16%
15752
52%
15752
23%
31623

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
25%
720
15%
2327
11%
716
31%
716
13%
1714
January16th to endNight
26%
768
18%
2496
11%
768
35%
768
15%
1779
February1st to 15thNight
24%
704
14%
2148
7%
701
31%
701
15%
1539
February16th to endNight
22%
631
17%
1893
10%
631
29%
631
14%
1411
March1st to 15thNight
31%
720
18%
2058
13%
720
35%
720
19%
1451
March16th to endNight
34%
768
15%
2112
10%
768
38%
768
20%
1512
April1st to 15thNight
39%
635
22%
1893
12%
635
49%
635
26%
1191
April16th to endNight
43%
540
20%
1648
12%
540
50%
540
25%
1069
May1st to 15thNight
46%
539
16%
1620
10%
539
50%
539
22%
1116
May16th to endNight
59%
561
17%
1683
13%
561
61%
561
26%
1099
June1st to 15thNight
69%
540
15%
1620
13%
540
71%
540
30%
1018
June16th to endNight
69%
540
17%
1620
16%
540
70%
540
28%
1014
July1st to 15thNight
66%
510
12%
1530
11%
510
66%
510
26%
994
July16th to endNight
71%
564
16%
1595
14%
531
75%
531
30%
996
August1st to 15thNight
74%
539
19%
1609
18%
536
74%
536
33%
974
August16th to endNight
75%
573
21%
1845
22%
573
76%
573
32%
1078
September1st to 15thNight
64%
702
21%
1962
18%
702
65%
702
30%
1256
September16th to endNight
61%
717
27%
1980
23%
717
63%
717
34%
1228
October1st to 15thNight
59%
720
31%
2027
28%
720
62%
720
36%
1197
October16th to endNight
46%
768
29%
2317
25%
768
54%
768
30%
1424
November1st to 15thNight
49%
760
27%
2471
25%
760
56%
760
28%
1473
November16th to endNight
43%
780
26%
2535
21%
780
51%
780
25%
1569
December1st to 15thNight
34%
728
15%
2365
13%
728
38%
728
15%
1702
December16th to endNight
31%
768
17%
2496
11%
768
39%
768
14%
1819

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
14%7%36%5%35%5%5%7%35%
48593
Night
13%7%35%5%3445%7%39%
48048
TransparencyDay
46%6%10%19%14%2
48294
Night
43%5%10%20%16%3
47851
SeeingDay
19%8%19%22%20%10%
5626
Night
18%8%18%29%20%3
15798

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
17%12%5%10%5%2345%427%
1611
16th to endDay
17%11%5%6%424335%35%
1728
February1st to 15thDay
16%11%5%8%6%24345%31%
1711
16th to endDay
17%11%48%5%24446%29%
1580
March1st to 15thDay
19%11%35%323445%35%
1901
16th to endDay
17%10%36%5%3445%6%32%
2111
April1st to 15thDay
13%6%25%5%2446%7%41%
2065
16th to endDay
16%6%26%5%3446%5%36%
2310
May1st to 15thDay
17%7%36%6%35%5%6%7%30%
2331
16th to endDay
13%6%27%5%35%5%6%8%35%
2431
June1st to 15thDay
9%5%36%7%47%6%6%8%34%
2340
16th to endDay
7%5%35%6%46%6%8%10%35%
2340
July1st to 15thDay
12%6%37%7%5%7%6%6%8%28%
2340
16th to endDay
11%6%36%7%48%7%6%10%27%
2465
August1st to 15thDay
10%5%36%7%5%6%7%7%11%29%
2340
16th to endDay
11%426%5%45%7%8%8%34%
2354
September1st to 15thDay
15%6%35%6%35%5%5%7%33%
1986
16th to endDay
15%6%25%42445%5%44%
1980
October1st to 15thDay
11%415%434346%51%
1932
16th to endDay
17%6%23413246%46%
1905
November1st to 15thDay
12%6%25%424447%44%
1717
16th to endDay
14%9%24313336%45%
1755
December1st to 15thDay
17%8%47%6%24446%33%
1632
16th to endDay
17%12%46%43345%7%29%
1728
January1st to 15thNight
17%9%49%8%3433431%
2327
16th to endNight
18%9%6%7%5%2433433%
2496
February1st to 15thNight
16%10%48%5%34446%30%
2139
16th to endNight
16%12%5%8%5%2444430%
1893
March1st to 15thNight
16%11%46%5%23345%35%
2058
16th to endNight
13%10%36%5%35%45%6%35%
2112
April1st to 15thNight
13%6%2442445%7%44%
1893
16th to endNight
12%6%35%5%2446%6%41%
1648
May1st to 15thNight
16%6%36%435%45%7%36%
1619
16th to endNight
8%426%6%45%6%6%9%39%
1682
June1st to 15thNight
5%434435%7%8%11%41%
1620
16th to endNight
6%325%5%46%5%6%11%41%
1620
July1st to 15thNight
10%5%245%36%6%6%11%38%
1620
16th to endNight
6%3245%47%7%8%11%38%
1703
August1st to 15thNight
6%325%5%25%6%7%10%44%
1620
16th to endNight
7%3133347%8%10%44%
1845
September1st to 15thNight
11%5%25%42445%10%43%
1962
16th to endNight
10%5%25%5%34336%50%
1980
October1st to 15thNight
12%6%13313337%53%
2027
16th to endNight
15%6%15%322345%47%
2317
November1st to 15thNight
14%6%25%223336%49%
2471
16th to endNight
15%6%25%323345%46%
2535
December1st to 15thNight
18%11%47%5%25%335%32%
2365
16th to endNight
19%11%46%6%34435%30%
2496

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
58%46%16%11%2
1612
16th to endDay
51%39%22%11%1
1728
February1st to 15thDay
55%47%19%11%2
1713
16th to endDay
55%410%17%11%1
1580
March1st to 15thDay
50%48%19%14%3
1901
16th to endDay
52%6%10%18%11%
2112
April1st to 15thDay
41%5%11%21%16%3
2065
16th to endDay
47%5%9%20%14%3
2310
May1st to 15thDay
50%7%10%18%10%1
2331
16th to endDay
44%7%14%21%9%2
2435
June1st to 15thDay
43%9%14%19%11%1
2340
16th to endDay
40%9%12%17%16%2
2340
July1st to 15thDay
49%8%13%13%11%2
2201
16th to endDay
46%9%13%16%11%2
2310
August1st to 15thDay
44%10%13%18%11%1
2327
16th to endDay
42%9%14%18%14%1
2354
September1st to 15thDay
46%8%10%16%13%4
1986
16th to endDay
40%5%8%20%21%2
1980
October1st to 15thDay
34%410%22%23%4
1932
16th to endDay
39%37%23%21%4
1905
November1st to 15thDay
39%47%20%23%4
1717
16th to endDay
41%46%23%21%2
1755
December1st to 15thDay
52%49%19%11%2
1632
16th to endDay
54%5%12%16%10%1
1728
January1st to 15thNight
57%37%14%12%3
2327
16th to endNight
54%37%19%12%1
2496
February1st to 15thNight
54%310%19%10%1
2148
16th to endNight
56%47%18%10%1
1893
March1st to 15thNight
50%49%17%14%3
2058
16th to endNight
48%6%10%21%11%1
2112
April1st to 15thNight
39%49%24%17%4
1893
16th to endNight
40%7%12%21%13%4
1648
May1st to 15thNight
45%8%13%21%10%2
1620
16th to endNight
39%9%14%22%12%2
1684
June1st to 15thNight
32%11%19%21%13%2
1620
16th to endNight
34%9%13%22%15%3
1620
July1st to 15thNight
38%9%16%18%14%2
1530
16th to endNight
32%10%18%20%14%3
1595
August1st to 15thNight
31%8%19%20%17%1
1609
16th to endNight
29%9%18%24%15%1
1845
September1st to 15thNight
36%8%14%20%14%5%
1962
16th to endNight
36%49%20%26%2
1980
October1st to 15thNight
31%5%8%23%24%6%
2027
16th to endNight
38%25%22%23%5%
2317
November1st to 15thNight
37%36%20%24%7%
2471
16th to endNight
41%35%23%22%3
2535
December1st to 15thNight
55%48%17%11%3
2365
16th to endNight
56%49%14%13%1
2496

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%22%28%8%5%2
90
16th to endDay
30%27%30%9%3
96
February1st to 15thDay
33%22%34%8%1
90
16th to endDay
32%16%38%11%2
81
March1st to 15thDay
31%15%24%25%2
191
16th to endDay
21%13%29%22%11%1
288
April1st to 15thDay
22%12%19%27%14%2
270
16th to endDay
24%6%22%23%18%3
270
May1st to 15thDay
22%13%26%16%13%7%
288
16th to endDay
20%319%24%13%17%
331
June1st to 15thDay
10%5%10%25%28%19%
315
16th to endDay
11%5%20%24%23%13%
315
July1st to 15thDay
18%415%25%18%17%
305
16th to endDay
14%29%24%26%23%
326
August1st to 15thDay
15%212%18%33%17%
313
16th to endDay
12%110%22%31%19%
332
September1st to 15thDay
18%39%17%34%16%
315
16th to endDay
15%311%25%28%15%
314
October1st to 15thDay
13%5%18%26%28%8%
315
16th to endDay
18%10%21%23%22%3
321
November1st to 15thDay
19%9%33%20%16%1
135
16th to endDay
20%14%30%20%13%
135
December1st to 15thDay
24%19%29%19%6%1
94
16th to endDay
22%25%39%10%2
96
January1st to 15thNight
26%16%25%25%5%
720
16th to endNight
26%16%25%29%2
768
February1st to 15thNight
26%14%28%28%1
704
16th to endNight
27%17%29%22%3
631
March1st to 15thNight
26%14%22%30%6%
720
16th to endNight
20%12%26%28%11%
768
April1st to 15thNight
20%12%24%29%13%
635
16th to endNight
15%9%25%33%15%1
540
May1st to 15thNight
19%5%21%34%17%2
540
16th to endNight
10%114%33%31%8%
563
June1st to 15thNight
6%211%33%36%9%
540
16th to endNight
7%19%36%38%5%
540
July1st to 15thNight
15%8%28%41%5%
510
16th to endNight
7%17%24%44%14%
564
August1st to 15thNight
9%15%29%44%9%
539
16th to endNight
10%16%28%46%7%
573
September1st to 15thNight
16%18%27%38%8%
702
16th to endNight
12%213%27%37%5%
717
October1st to 15thNight
16%6%13%29%27%6%
720
16th to endNight
19%8%19%28%20%2
768
November1st to 15thNight
18%9%16%31%19%3
760
16th to endNight
21%12%18%35%13%
780
December1st to 15thNight
27%12%19%29%9%
728
16th to endNight
28%14%21%29%6%
768
Page generated at 2017-12-03 11:16:37. Version ac04

Copyright 2017 A. Danko


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