Schoonover Park
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Schoonover Park 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
63%
15535
24%
46992
22%
15499
65%
15499
35%
27280

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
64%
716
18%
2363
18%
716
67%
716
29%
1406
January16th to endNight
62%
768
24%
2496
25%
768
63%
768
26%
1559
February1st to 15thNight
58%
700
21%
2264
23%
700
61%
700
24%
1437
February16th to endNight
52%
632
20%
1895
19%
632
55%
632
25%
1247
March1st to 15thNight
58%
720
17%
2013
16%
720
59%
720
28%
1323
March16th to endNight
55%
768
19%
2082
16%
768
57%
768
29%
1379
April1st to 15thNight
54%
719
20%
1799
13%
719
55%
719
30%
1227
April16th to endNight
60%
720
22%
1800
11%
720
63%
720
40%
1109
May1st to 15thNight
64%
662
20%
1742
14%
662
65%
662
39%
1046
May16th to endNight
56%
408
20%
1531
19%
408
60%
408
27%
864
June1st to 15thNight
61%
360
21%
1440
24%
360
64%
360
29%
765
June16th to endNight
79%
360
31%
1440
40%
360
80%
360
52%
566
July1st to 15thNight
71%
404
24%
1424
27%
404
71%
404
48%
628
July16th to endNight
63%
564
25%
1593
23%
531
64%
531
41%
844
August1st to 15thNight
59%
586
22%
1659
17%
583
59%
583
41%
922
August16th to endNight
70%
764
28%
1910
18%
764
70%
764
53%
1049
September1st to 15thNight
79%
720
34%
1800
25%
720
80%
720
59%
950
September16th to endNight
76%
692
37%
1881
35%
692
77%
692
54%
959
October1st to 15thNight
73%
660
28%
1980
32%
660
75%
660
42%
1067
October16th to endNight
70%
704
31%
2112
34%
704
72%
704
40%
1159
November1st to 15thNight
67%
700
28%
2175
29%
700
69%
700
37%
1199
November16th to endNight
68%
720
25%
2385
28%
720
71%
720
34%
1310
December1st to 15thNight
59%
720
21%
2520
22%
720
62%
720
24%
1569
December16th to endNight
52%
768
20%
2688
20%
768
57%
768
22%
1696

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
8%6%24323349%52%
47928
Night
9%7%24423347%50%
47182
TransparencyDay
28%5%9%19%22%14%
47618
Night
31%5%9%17%21%14%
46993
SeeingDay
8%6%21%36%22%4
6084
Night
10%311%28%33%12%
15545

By Month

Percentage Cloud Cover SW (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
13%5%24423347%49%
1572
16th to endDay
14%6%24423345%47%
1728
February1st to 15thDay
14%7%23324446%45%
1598
16th to endDay
16%6%35%423447%40%
1579
March1st to 15thDay
12%5%25%42445%10%41%
1944
16th to endDay
11%6%35%4345%5%7%42%
2142
April1st to 15thDay
11%6%25%433447%45%
2149
16th to endDay
8%6%34322347%54%
2160
May1st to 15thDay
5%5%233233410%54%
2206
16th to endDay
8%8%25%423349%47%
2578
June1st to 15thDay
6%6%2442345%9%51%
2520
16th to endDay
35%132122410%62%
2520
July1st to 15thDay
46%1321245%12%54%
2448
16th to endDay
35%2321335%13%54%
2468
August1st to 15thDay
38%2442235%13%49%
2291
16th to endDay
17%2432235%12%54%
2292
September1st to 15thDay
3412222349%63%
2160
16th to endDay
4412212246%66%
1933
October1st to 15thDay
6%32221335%7%61%
1650
16th to endDay
6%5%13323346%58%
1760
November1st to 15thDay
9%424423337%54%
1682
16th to endDay
11%5%24322347%52%
1572
December1st to 15thDay
13%7%26%424446%42%
1440
16th to endDay
15%5%25%5%23346%45%
1536
January1st to 15thNight
12%5%15%323347%48%
2363
16th to endNight
14%5%14323446%48%
2496
February1st to 15thNight
13%6%35%32435%6%44%
2253
16th to endNight
15%6%24423447%43%
1895
March1st to 15thNight
12%6%2442345%7%45%
2013
16th to endNight
12%6%245%24448%45%
2082
April1st to 15thNight
12%6%2442435%7%47%
1799
16th to endNight
7%5%23312338%58%
1800
May1st to 15thNight
49%24412247%55%
1742
16th to endNight
7%10%25%422247%49%
1530
June1st to 15thNight
6%9%24423437%51%
1440
16th to endNight
36%22213227%63%
1440
July1st to 15thNight
210%34432349%51%
1509
16th to endNight
316%35%43445%9%38%
1701
August1st to 15thNight
416%47%42335%7%39%
1668
16th to endNight
310%36%43325%8%49%
1910
September1st to 15thNight
45%23323347%57%
1800
16th to endNight
37%13213227%64%
1881
October1st to 15thNight
6%414323346%59%
1980
16th to endNight
6%6%23423337%55%
2112
November1st to 15thNight
8%6%23312337%56%
2175
16th to endNight
8%5%23313447%55%
2385
December1st to 15thNight
13%6%25%42345%6%46%
2520
16th to endNight
17%425%423345%46%
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
37%6%9%21%15%9%
1572
16th to endDay
41%5%7%12%20%12%
1728
February1st to 15thDay
40%5%9%17%20%6%
1598
16th to endDay
46%6%9%21%12%3
1579
March1st to 15thDay
39%8%12%17%14%6%
1944
16th to endDay
41%8%15%17%15%2
2142
April1st to 15thDay
42%6%12%23%14%2
2149
16th to endDay
30%6%12%24%19%5%
2160
May1st to 15thDay
24%6%11%27%24%6%
2206
16th to endDay
34%5%12%23%18%4
2582
June1st to 15thDay
27%5%11%21%22%10%
2520
16th to endDay
14%35%21%31%24%
2520
July1st to 15thDay
16%2313%24%38%
2305
16th to endDay
13%36%14%32%29%
2313
August1st to 15thDay
18%3414%29%29%
2275
16th to endDay
16%2417%33%25%
2292
September1st to 15thDay
13%25%18%29%30%
2160
16th to endDay
17%37%22%29%18%
1933
October1st to 15thDay
23%49%22%23%16%
1650
16th to endDay
25%49%23%20%16%
1760
November1st to 15thDay
30%5%10%20%26%5%
1682
16th to endDay
32%5%11%16%26%7%
1572
December1st to 15thDay
43%6%9%14%18%7%
1440
16th to endDay
41%5%12%17%16%6%
1536
January1st to 15thNight
36%5%12%17%19%9%
2363
16th to endNight
38%6%9%12%17%15%
2496
February1st to 15thNight
40%6%9%17%18%8%
2264
16th to endNight
42%6%11%22%12%3
1895
March1st to 15thNight
39%6%13%17%15%7%
2013
16th to endNight
37%9%13%17%16%5%
2082
April1st to 15thNight
39%7%11%24%13%3
1799
16th to endNight
27%8%14%23%19%6%
1800
May1st to 15thNight
29%5%10%19%25%9%
1743
16th to endNight
34%6%12%22%19%5%
1531
June1st to 15thNight
31%6%10%17%18%16%
1440
16th to endNight
15%35%14%30%31%
1440
July1st to 15thNight
18%347%28%36%
1424
16th to endNight
25%5%7%10%24%26%
1593
August1st to 15thNight
28%35%11%24%26%
1659
16th to endNight
23%2414%27%28%
1910
September1st to 15thNight
18%2413%26%33%
1800
16th to endNight
19%35%20%32%19%
1881
October1st to 15thNight
25%5%8%23%21%17%
1980
16th to endNight
26%5%6%22%22%16%
2112
November1st to 15thNight
29%412%20%24%8%
2175
16th to endNight
29%6%10%19%24%9%
2385
December1st to 15thNight
38%7%9%14%20%8%
2520
16th to endNight
41%6%12%16%15%7%
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
19%7%24%25%18%3
201
16th to endDay
15%10%24%26%19%3
256
February1st to 15thDay
14%7%25%26%19%5%
241
16th to endDay
16%10%23%34%12%1
238
March1st to 15thDay
13%9%31%25%17%3
270
16th to endDay
9%12%35%30%10%2
288
April1st to 15thDay
14%16%29%27%9%1
269
16th to endDay
6%18%32%30%10%2
270
May1st to 15thDay
9%12%30%35%10%2
288
16th to endDay
13%8%22%35%14%5%
330
June1st to 15thDay
46%30%41%13%3
315
16th to endDay
1117%46%28%3
315
July1st to 15thDay
411%44%32%6%
305
16th to endDay
19%46%33%8%
327
August1st to 15thDay
5%11%49%27%5%
315
16th to endDay
28%48%34%6%
332
September1st to 15thDay
3113%44%28%7%
315
16th to endDay
36%15%32%34%7%
288
October1st to 15thDay
47%23%37%23%3
255
16th to endDay
9%225%33%25%2
272
November1st to 15thDay
6%6%17%24%34%10%
188
16th to endDay
7%10%14%39%24%3
82
December1st to 15thDay
23%6%25%30%15%
60
16th to endDay
15%9%7%32%28%6%
64
January1st to 15thNight
12%411%30%31%9%
720
16th to endNight
14%412%28%30%9%
768
February1st to 15thNight
14%5%14%28%30%7%
704
16th to endNight
17%6%16%30%24%5%
632
March1st to 15thNight
14%5%13%29%29%8%
720
16th to endNight
12%5%18%28%29%5%
768
April1st to 15thNight
12%7%18%32%24%5%
719
16th to endNight
8%5%18%28%28%10%
720
May1st to 15thNight
7%214%36%30%9%
663
16th to endNight
12%213%27%32%11%
409
June1st to 15thNight
8%115%33%33%7%
360
16th to endNight
46%27%49%12%
360
July1st to 15thNight
5%425%42%22%
404
16th to endNight
4323%40%26%
564
August1st to 15thNight
6%6%29%41%15%
586
16th to endNight
4427%46%16%
764
September1st to 15thNight
5%322%48%20%
720
16th to endNight
49%21%42%21%
692
October1st to 15thNight
7%27%29%36%16%
660
16th to endNight
8%110%24%33%20%
704
November1st to 15thNight
9%212%27%35%13%
700
16th to endNight
10%210%30%34%11%
720
December1st to 15thNight
15%412%32%27%7%
720
16th to endNight
18%7%14%31%24%4
768
Page generated at 2017-09-25 06:02:23. Version ac04

Copyright 2017 A. Danko


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