Woodland Altars Campground
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Woodland Altars Campground clear sky chart from 2005-11-05 to 2017-09-24.

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
39%
15506
18%
47005
12%
15464
45%
15464
22%
31609

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
13%
720
12%
2327
5%
716
22%
716
9%
1848
January16th to endNight
17%
768
13%
2496
6%
768
26%
768
12%
1855
February1st to 15thNight
18%
702
12%
2208
5%
701
26%
701
13%
1614
February16th to endNight
17%
631
13%
1893
5%
631
25%
631
13%
1411
March1st to 15thNight
24%
720
16%
2058
9%
720
31%
720
16%
1491
March16th to endNight
27%
768
15%
2112
8%
768
33%
768
19%
1510
April1st to 15thNight
28%
628
17%
1877
8%
628
36%
628
22%
1246
April16th to endNight
35%
540
20%
1620
9%
540
45%
540
23%
1087
May1st to 15thNight
35%
540
15%
1620
8%
540
41%
540
20%
1119
May16th to endNight
56%
562
16%
1684
11%
561
60%
561
28%
1082
June1st to 15thNight
63%
540
18%
1620
14%
540
67%
540
35%
945
June16th to endNight
60%
540
17%
1620
13%
540
64%
540
34%
955
July1st to 15thNight
57%
510
15%
1530
13%
510
60%
510
30%
958
July16th to endNight
71%
564
18%
1595
15%
531
75%
531
37%
932
August1st to 15thNight
69%
539
23%
1609
18%
536
72%
536
34%
957
August16th to endNight
71%
573
25%
1784
23%
573
73%
573
38%
995
September1st to 15thNight
61%
696
26%
1956
19%
696
65%
696
36%
1184
September16th to endNight
60%
693
28%
1914
22%
693
64%
693
32%
1200
October1st to 15thNight
50%
660
28%
1882
22%
660
57%
660
34%
1130
October16th to endNight
35%
704
22%
2148
16%
704
43%
704
22%
1407
November1st to 15thNight
43%
700
25%
2276
21%
700
52%
700
28%
1329
November16th to endNight
29%
720
18%
2340
13%
720
37%
720
17%
1613
December1st to 15thNight
23%
720
11%
2340
8%
720
28%
720
12%
1778
December16th to endNight
19%
768
12%
2496
6%
768
26%
768
10%
1963

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%8%36%5%3445%7%35%
47915
Night
14%8%35%42445%7%38%
47198
Cloud CoverDay
16%8%35%5%3445%7%35%
47925
Night
15%8%35%5%2445%7%38%
47202
TransparencyDay
47%6%11%19%12%1
47626
Night
44%6%11%20%14%2
47005
SeeingDay
19%10%25%20%15%8%
5359
Night
19%11%24%26%15%2
15509

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
21%12%6%9%5%3433423%
1611
16th to endDay
18%13%6%9%6%34346%24%
1728
February1st to 15thDay
18%13%5%8%424445%28%
1654
16th to endDay
17%14%47%5%3444427%
1580
March1st to 15thDay
21%11%46%6%2334430%
1891
16th to endDay
20%10%45%5%34345%31%
2112
April1st to 15thDay
17%8%35%42235%6%38%
2080
16th to endDay
18%5%26%5%34347%38%
2340
May1st to 15thDay
22%8%36%435%445%31%
2331
16th to endDay
12%436%6%45%6%5%8%36%
2431
June1st to 15thDay
10%415%5%45%5%6%9%40%
2340
16th to endDay
10%425%5%46%7%8%9%35%
2340
July1st to 15thDay
15%5%26%5%35%5%6%8%34%
2340
16th to endDay
9%425%5%36%7%7%9%36%
2465
August1st to 15thDay
6%426%7%45%6%7%10%37%
2340
16th to endDay
7%4245%36%7%7%8%42%
2417
September1st to 15thDay
14%424435%5%5%6%44%
1992
16th to endDay
15%6%25%423436%44%
1905
October1st to 15thDay
14%5%145%2445%6%45%
1746
16th to endDay
21%8%23413335%42%
1722
November1st to 15thDay
12%8%245%23345%47%
1582
16th to endDay
17%11%25%5%2435%5%35%
1620
December1st to 15thDay
23%14%6%8%5%24335%22%
1620
16th to endDay
22%14%5%7%5%13337%24%
1728
January1st to 15thNight
19%14%5%10%6%2443423%
2327
16th to endNight
18%14%5%7%5%2434428%
2496
February1st to 15thNight
20%13%46%5%24435%30%
2206
16th to endNight
19%13%38%5%33445%28%
1893
March1st to 15thNight
17%8%36%6%35%45%5%31%
2046
16th to endNight
17%8%46%5%2445%7%33%
2112
April1st to 15thNight
14%6%35%5%25%46%7%37%
1877
16th to endNight
14%5%36%5%3445%7%39%
1620
May1st to 15thNight
17%7%35%43345%8%35%
1620
16th to endNight
8%4245%35%6%6%11%41%
1682
June1st to 15thNight
5%214426%6%5%10%49%
1620
16th to endNight
8%313425%5%8%11%46%
1620
July1st to 15thNight
10%425%43445%10%44%
1620
16th to endNight
5%214435%5%6%9%49%
1703
August1st to 15thNight
5%324435%5%6%9%49%
1620
16th to endNight
5%3133245%6%10%52%
1784
September1st to 15thNight
12%413323347%52%
1956
16th to endNight
12%4245%34445%49%
1914
October1st to 15thNight
9%5%1442445%7%49%
1882
16th to endNight
18%7%24424435%41%
2148
November1st to 15thNight
14%5%13433347%47%
2276
16th to endNight
20%9%35%5%24345%35%
2340
December1st to 15thNight
23%12%47%5%23345%25%
2340
16th to endNight
21%15%5%7%424335%23%
2496

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%12%6%9%6%3343423%
1611
16th to endDay
19%13%7%7%5%3345%6%24%
1728
February1st to 15thDay
18%13%5%8%424345%28%
1654
16th to endDay
17%15%47%6%24445%27%
1580
March1st to 15thDay
22%11%47%5%2433431%
1902
16th to endDay
21%9%45%5%24335%32%
2111
April1st to 15thDay
18%8%44422346%38%
2080
16th to endDay
18%5%26%5%34346%38%
2340
May1st to 15thDay
22%8%36%435%445%31%
2331
16th to endDay
12%435%6%46%5%5%8%36%
2431
June1st to 15thDay
10%5%245%45%5%5%9%40%
2340
16th to endDay
10%425%5%46%6%6%9%36%
2340
July1st to 15thDay
15%5%25%5%26%5%6%8%34%
2340
16th to endDay
10%5%245%46%6%7%10%35%
2465
August1st to 15thDay
7%5%26%6%45%6%7%10%37%
2340
16th to endDay
8%415%5%35%7%7%8%42%
2417
September1st to 15thDay
14%5%24435%446%44%
1992
16th to endDay
15%6%24433436%44%
1905
October1st to 15thDay
14%6%2442445%7%44%
1746
16th to endDay
21%8%24313336%42%
1722
November1st to 15thDay
12%8%3342334447%
1582
16th to endDay
17%10%35%5%2345%6%35%
1620
December1st to 15thDay
23%13%6%7%434445%22%
1620
16th to endDay
22%14%5%8%324246%24%
1728
January1st to 15thNight
20%13%5%10%6%2444422%
2327
16th to endNight
18%14%6%7%6%2334429%
2496
February1st to 15thNight
19%13%45%5%23446%30%
2199
16th to endNight
18%14%47%5%34335%29%
1893
March1st to 15thNight
17%9%37%5%345%5%6%31%
2058
16th to endNight
16%8%47%42445%7%33%
2112
April1st to 15thNight
14%6%35%435%5%5%7%38%
1877
16th to endNight
15%5%35%5%3345%6%40%
1620
May1st to 15thNight
18%7%35%42435%8%35%
1619
16th to endNight
9%3235%35%5%7%11%41%
1682
June1st to 15thNight
5%214426%5%6%11%49%
1620
16th to endNight
8%323415%5%8%10%46%
1620
July1st to 15thNight
10%5%245%245%5%10%44%
1620
16th to endNight
5%314335%5%7%9%49%
1703
August1st to 15thNight
5%3244345%7%9%49%
1620
16th to endNight
5%3134245%6%10%52%
1784
September1st to 15thNight
12%322423437%52%
1956
16th to endNight
12%4245%34445%49%
1914
October1st to 15thNight
10%5%135%2345%7%49%
1882
16th to endNight
18%6%23424435%41%
2148
November1st to 15thNight
15%5%23423347%48%
2276
16th to endNight
20%9%26%424335%35%
2340
December1st to 15thNight
23%12%5%7%5%24445%26%
2340
16th to endNight
21%15%6%7%5%24435%23%
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
63%48%14%9%
1612
16th to endDay
60%413%16%4
1728
February1st to 15thDay
57%5%13%14%8%
1656
16th to endDay
58%5%10%19%5%
1580
March1st to 15thDay
56%410%20%7%
1902
16th to endDay
54%5%9%20%8%
2112
April1st to 15thDay
45%5%10%24%12%2
2080
16th to endDay
45%5%10%19%14%4
2340
May1st to 15thDay
53%5%12%17%9%2
2331
16th to endDay
43%9%13%19%12%1
2435
June1st to 15thDay
38%8%14%21%15%
2340
16th to endDay
40%9%13%19%14%2
2340
July1st to 15thDay
46%7%11%17%14%2
2201
16th to endDay
40%9%16%19%13%1
2310
August1st to 15thDay
37%9%14%22%13%1
2327
16th to endDay
35%7%14%23%15%4
2417
September1st to 15thDay
39%6%11%19%18%4
1992
16th to endDay
42%5%8%18%23%1
1905
October1st to 15thDay
38%5%10%23%19%2
1746
16th to endDay
44%410%26%13%1
1722
November1st to 15thDay
39%39%23%17%5%
1582
16th to endDay
49%410%21%13%1
1620
December1st to 15thDay
63%5%10%14%5%
1620
16th to endDay
61%411%14%7%
1728
January1st to 15thNight
65%46%14%8%
2327
16th to endNight
58%410%18%6%1
2496
February1st to 15thNight
56%411%18%8%1
2208
16th to endNight
58%410%18%8%
1893
March1st to 15thNight
52%5%9%20%10%1
2058
16th to endNight
49%6%12%21%9%
2112
April1st to 15thNight
43%6%10%20%16%2
1877
16th to endNight
43%6%9%17%15%6%
1620
May1st to 15thNight
46%7%12%21%10%2
1620
16th to endNight
34%10%15%20%15%3
1684
June1st to 15thNight
28%9%16%24%19%2
1620
16th to endNight
29%9%16%22%19%2
1620
July1st to 15thNight
36%7%11%22%18%4
1530
16th to endNight
26%9%17%27%16%2
1595
August1st to 15thNight
29%9%14%25%18%3
1609
16th to endNight
26%8%14%25%20%4
1784
September1st to 15thNight
31%6%12%21%22%5%
1956
16th to endNight
35%6%6%20%29%1
1914
October1st to 15thNight
32%5%10%27%18%3
1882
16th to endNight
43%410%25%13%2
2148
November1st to 15thNight
36%211%21%22%4
2276
16th to endNight
51%39%20%13%1
2340
December1st to 15thNight
59%5%9%16%7%1
2340
16th to endNight
63%5%9%15%6%
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
35%24%27%6%41
90
16th to endDay
42%27%22%7%
96
February1st to 15thDay
30%38%25%41
90
16th to endDay
29%19%41%7%1
81
March1st to 15thDay
33%18%29%14%3
192
16th to endDay
25%17%31%17%7%
288
April1st to 15thDay
24%15%30%19%10%
270
16th to endDay
21%11%32%13%15%5%
270
May1st to 15thDay
27%13%29%13%10%4
288
16th to endDay
14%9%31%22%12%10%
331
June1st to 15thDay
10%6%25%31%16%9%
315
16th to endDay
14%10%26%23%15%9%
315
July1st to 15thDay
20%5%21%24%15%13%
305
16th to endDay
11%116%26%23%19%
326
August1st to 15thDay
8%218%24%27%18%
313
16th to endDay
9%121%27%24%15%
332
September1st to 15thDay
14%5%17%22%28%12%
315
16th to endDay
20%314%19%29%12%
287
October1st to 15thDay
14%8%24%25%17%9%
255
16th to endDay
21%11%34%23%8%1
234
November1st to 15thDay
18%13%24%25%13%4
90
16th to endDay
28%23%30%13%4
90
December1st to 15thDay
31%24%27%10%6%
90
16th to endDay
35%31%25%8%
96
January1st to 15thNight
30%19%30%15%3
720
16th to endNight
26%21%30%19%1
768
February1st to 15thNight
29%19%28%22%
704
16th to endNight
26%18%33%20%1
631
March1st to 15thNight
24%17%28%24%4
720
16th to endNight
20%13%33%23%9%
768
April1st to 15thNight
19%15%33%23%7%
628
16th to endNight
18%10%31%26%11%1
540
May1st to 15thNight
21%9%28%25%13%
540
16th to endNight
9%423%32%25%4
563
June1st to 15thNight
5%222%41%25%2
540
16th to endNight
7%224%34%27%2
540
July1st to 15thNight
15%17%35%26%3
510
16th to endNight
6%113%34%38%6%
564
August1st to 15thNight
7%112%37%34%6%
539
16th to endNight
6%114%35%36%7%
573
September1st to 15thNight
14%313%29%32%6%
696
16th to endNight
13%5%14%29%31%6%
693
October1st to 15thNight
12%8%24%29%20%3
660
16th to endNight
21%13%26%26%11%
704
November1st to 15thNight
18%11%23%26%18%2
700
16th to endNight
25%15%25%24%7%
720
December1st to 15thNight
32%16%22%21%6%
720
16th to endNight
29%17%28%20%2
768
Page generated at 2017-09-25 09:02:21. Version ac04

Copyright 2017 A. Danko


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