Sunken Meadow State Park
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Sunken Meadow State Park clear sky chart from 2005-11-05 to 2018-01-12.

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
37%
15485
19%
48340
10%
15454
47%
15454
23%
31224

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
23%
765
20%
2662
8%
761
39%
761
20%
1645
January16th to endNight
20%
768
20%
2628
7%
768
38%
768
19%
1652
February1st to 15thNight
19%
704
17%
2193
4%
701
34%
701
20%
1445
February16th to endNight
24%
631
25%
1893
9%
631
43%
631
24%
1193
March1st to 15thNight
26%
720
18%
2160
9%
720
40%
720
24%
1435
March16th to endNight
28%
768
24%
1998
8%
768
40%
768
28%
1311
April1st to 15thNight
34%
718
17%
1796
6%
718
39%
718
27%
1260
April16th to endNight
37%
675
18%
1755
6%
675
43%
675
27%
1201
May1st to 15thNight
34%
540
17%
1620
8%
540
42%
540
21%
1133
May16th to endNight
48%
374
15%
1497
15%
374
53%
374
18%
961
June1st to 15thNight
48%
360
15%
1440
16%
360
54%
360
18%
929
June16th to endNight
65%
360
14%
1440
20%
360
69%
360
24%
842
July1st to 15thNight
61%
340
11%
1360
16%
340
62%
340
20%
848
July16th to endNight
63%
376
16%
1418
18%
354
68%
354
23%
836
August1st to 15thNight
62%
545
19%
1616
15%
543
64%
543
31%
977
August16th to endNight
63%
764
18%
1910
10%
764
65%
764
33%
1266
September1st to 15thNight
53%
720
22%
1815
13%
720
57%
720
33%
1201
September16th to endNight
52%
717
24%
1980
18%
717
57%
717
31%
1280
October1st to 15thNight
39%
720
20%
2069
13%
720
46%
720
25%
1360
October16th to endNight
32%
768
21%
2427
11%
768
45%
768
24%
1542
November1st to 15thNight
34%
760
20%
2472
11%
760
47%
760
23%
1570
November16th to endNight
30%
780
22%
2549
12%
780
43%
780
22%
1601
December1st to 15thNight
25%
780
15%
2730
7%
780
37%
780
17%
1808
December16th to endNight
19%
832
19%
2912
5%
832
35%
832
17%
1928

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%5%2442445%7%42%
49004
Night
16%6%2442445%7%41%
48510
Cloud CoverDay
15%5%2442445%7%42%
49014
Night
16%6%2442445%6%42%
48515
TransparencyDay
40%6%12%22%16%2
48692
Night
41%5%11%22%15%2
48340
SeeingDay
19%422%30%18%4
6183
Night
19%7%30%29%11%1
15486

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
15%5%345%2435%8%41%
1520
16th to endDay
14%7%25%424347%41%
1593
February1st to 15thDay
16%5%35%5%24447%41%
1666
16th to endDay
14%5%24435%346%44%
1580
March1st to 15thDay
16%6%25%42445%8%38%
1790
16th to endDay
17%6%14413345%44%
2222
April1st to 15thDay
17%6%24324346%42%
2152
16th to endDay
16%5%14324446%47%
2205
May1st to 15thDay
20%6%24424348%38%
2342
16th to endDay
15%5%2442445%8%41%
2618
June1st to 15thDay
19%6%23423448%39%
2520
16th to endDay
10%4245%245%6%9%44%
2520
July1st to 15thDay
10%5%24435%5%7%9%43%
2520
16th to endDay
11%4244345%7%8%42%
2654
August1st to 15thDay
11%41443446%10%44%
2319
16th to endDay
11%42442345%8%47%
2292
September1st to 15thDay
11%423425%45%7%47%
2145
16th to endDay
14%6%13423346%46%
1980
October1st to 15thDay
19%5%24323447%43%
1890
16th to endDay
17%415%42345%6%44%
1797
November1st to 15thDay
20%5%145%23336%43%
1716
16th to endDay
13%6%25%324447%45%
1739
December1st to 15thDay
16%7%25%42446%7%37%
1560
16th to endDay
20%8%35%214347%36%
1664
January1st to 15thNight
17%5%24423339%42%
2662
16th to endNight
16%8%34423347%41%
2628
February1st to 15thNight
14%9%35%5%2445%6%40%
2192
16th to endNight
17%5%2442435%6%43%
1893
March1st to 15thNight
18%5%24333446%42%
2147
16th to endNight
15%7%24323346%44%
1998
April1st to 15thNight
17%6%344245%5%6%39%
1796
16th to endNight
18%6%35%423345%42%
1755
May1st to 15thNight
19%6%36%42435%6%36%
1620
16th to endNight
17%7%2443445%7%37%
1495
June1st to 15thNight
20%6%23414447%39%
1440
16th to endNight
9%425%5%35%5%5%9%43%
1440
July1st to 15thNight
11%425%436%5%8%10%37%
1440
16th to endNight
9%5%245%35%6%6%10%39%
1514
August1st to 15thNight
8%4135%345%7%8%45%
1626
16th to endNight
12%5%2443446%7%44%
1910
September1st to 15thNight
14%41342446%6%46%
1815
16th to endNight
14%425%5%23346%47%
1980
October1st to 15thNight
17%6%25%5%23235%44%
2069
16th to endNight
18%5%25%423347%42%
2427
November1st to 15thNight
17%6%245%2344445%
2472
16th to endNight
16%6%3442335%6%42%
2549
December1st to 15thNight
20%6%25%434448%36%
2730
16th to endNight
19%7%25%42435%6%37%
2912

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
15%6%25%5%24447%42%
1520
16th to endDay
15%6%36%42435%6%41%
1593
February1st to 15thDay
16%5%35%5%24446%41%
1666
16th to endDay
15%5%26%424445%44%
1580
March1st to 15thDay
16%7%3432445%8%38%
1800
16th to endDay
17%6%24423347%43%
2222
April1st to 15thDay
18%7%24324347%41%
2152
16th to endDay
16%5%1342445%6%45%
2205
May1st to 15thDay
21%7%2432335%7%38%
2342
16th to endDay
15%5%144345%5%8%40%
2618
June1st to 15thDay
19%6%2442345%8%38%
2520
16th to endDay
10%4245%245%6%9%42%
2520
July1st to 15thDay
10%5%245%25%5%7%9%42%
2520
16th to endDay
11%5%245%35%5%7%8%40%
2654
August1st to 15thDay
11%42442446%10%42%
2319
16th to endDay
12%425%32345%9%45%
2292
September1st to 15thDay
12%42442446%6%46%
2145
16th to endDay
15%6%24424445%45%
1980
October1st to 15thDay
19%5%24323447%42%
1890
16th to endDay
17%5%24323446%44%
1797
November1st to 15thDay
20%5%24423436%43%
1716
16th to endDay
13%6%25%424446%45%
1739
December1st to 15thDay
16%7%26%42345%8%38%
1560
16th to endDay
20%9%35%224347%37%
1664
January1st to 15thNight
17%5%24423337%44%
2662
16th to endNight
17%7%34423346%41%
2628
February1st to 15thNight
14%8%35%423446%40%
2185
16th to endNight
17%5%24324346%44%
1893
March1st to 15thNight
18%6%24424346%42%
2160
16th to endNight
16%7%24323446%44%
1997
April1st to 15thNight
18%6%344245%5%6%39%
1796
16th to endNight
18%6%35%423346%41%
1755
May1st to 15thNight
19%6%35%5%2445%6%36%
1620
16th to endNight
18%7%2442435%7%37%
1495
June1st to 15thNight
20%6%24424348%38%
1440
16th to endNight
9%5%26%5%35%5%6%8%43%
1440
July1st to 15thNight
11%435%426%5%8%10%37%
1440
16th to endNight
9%5%245%35%6%6%9%39%
1514
August1st to 15thNight
9%4234346%7%8%45%
1626
16th to endNight
12%5%244245%6%7%43%
1910
September1st to 15thNight
14%5%134245%5%6%46%
1815
16th to endNight
14%5%15%423346%47%
1980
October1st to 15thNight
17%6%15%5%23345%44%
2069
16th to endNight
18%5%24423436%43%
2427
November1st to 15thNight
17%6%1442344445%
2472
16th to endNight
16%6%2442345%6%43%
2549
December1st to 15thNight
20%6%24434447%37%
2730
16th to endNight
19%7%25%42445%5%38%
2912

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
41%413%24%11%3
1521
16th to endDay
43%312%25%13%2
1593
February1st to 15thDay
43%413%21%14%1
1669
16th to endDay
40%5%11%26%14%1
1580
March1st to 15thDay
43%6%14%22%11%2
1800
16th to endDay
41%5%10%20%18%3
2222
April1st to 15thDay
43%5%9%21%16%3
2152
16th to endDay
38%412%21%19%3
2205
May1st to 15thDay
45%6%10%20%16%1
2342
16th to endDay
39%8%17%19%13%2
2622
June1st to 15thDay
44%7%12%22%12%1
2520
16th to endDay
35%8%15%24%14%1
2520
July1st to 15thDay
36%7%13%22%17%1
2371
16th to endDay
35%9%14%24%13%2
2487
August1st to 15thDay
35%8%15%22%17%
2305
16th to endDay
34%6%11%24%20%2
2292
September1st to 15thDay
35%6%13%21%21%1
2145
16th to endDay
38%5%8%22%23%2
1980
October1st to 15thDay
41%6%11%21%18%1
1890
16th to endDay
39%5%10%25%17%1
1797
November1st to 15thDay
42%412%20%17%1
1716
16th to endDay
39%411%25%15%2
1739
December1st to 15thDay
43%6%16%17%14%1
1560
16th to endDay
48%5%14%18%12%
1664
January1st to 15thNight
41%5%12%23%14%3
2662
16th to endNight
42%5%11%23%15%2
2628
February1st to 15thNight
44%5%12%22%13%2
2193
16th to endNight
40%410%24%18%3
1893
March1st to 15thNight
43%412%20%14%3
2160
16th to endNight
39%5%9%22%18%4
1998
April1st to 15thNight
43%6%11%19%16%2
1796
16th to endNight
44%48%17%20%3
1755
May1st to 15thNight
48%6%9%17%15%2
1620
16th to endNight
45%6%14%18%13%1
1497
June1st to 15thNight
45%6%11%19%15%1
1440
16th to endNight
36%7%12%26%15%1
1440
July1st to 15thNight
38%10%12%21%14%1
1360
16th to endNight
37%8%14%25%11%2
1418
August1st to 15thNight
33%8%14%26%16%1
1616
16th to endNight
35%7%13%24%17%1
1910
September1st to 15thNight
36%6%10%26%17%1
1815
16th to endNight
39%5%7%21%24%2
1980
October1st to 15thNight
42%5%9%23%16%2
2069
16th to endNight
41%5%12%23%15%1
2427
November1st to 15thNight
42%410%21%18%3
2472
16th to endNight
41%410%26%13%2
2549
December1st to 15thNight
47%5%14%19%12%
2730
16th to endNight
46%5%13%20%13%1
2912

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
17%13%37%23%8%
82
16th to endDay
21%6%34%31%5%
73
February1st to 15thDay
22%9%37%28%2
182
16th to endDay
17%8%38%25%9%
239
March1st to 15thDay
20%8%38%25%6%
270
16th to endDay
20%7%39%22%7%2
288
April1st to 15thDay
21%7%28%28%14%
270
16th to endDay
22%422%32%15%2
270
May1st to 15thDay
30%325%26%12%2
288
16th to endDay
20%115%34%25%3
331
June1st to 15thDay
22%315%29%24%4
315
16th to endDay
16%113%42%23%2
315
July1st to 15thDay
13%19%42%28%3
305
16th to endDay
13%110%36%30%7%
326
August1st to 15thDay
15%10%35%29%8%
313
16th to endDay
11%29%36%30%10%
332
September1st to 15thDay
14%119%30%23%10%
315
16th to endDay
20%214%26%22%13%
314
October1st to 15thDay
23%415%26%21%7%
315
16th to endDay
15%8%29%27%17%1
305
November1st to 15thDay
22%8%25%26%15%2
280
16th to endDay
14%12%33%26%11%1
269
December1st to 15thDay
21%10%37%20%11%
90
16th to endDay
30%10%43%13%2
96
January1st to 15thNight
20%13%39%23%4
765
16th to endNight
22%13%39%23%1
768
February1st to 15thNight
19%10%44%23%2
704
16th to endNight
20%11%39%25%3
631
March1st to 15thNight
21%7%40%23%6%
720
16th to endNight
20%7%40%23%7%1
768
April1st to 15thNight
20%5%34%32%6%
718
16th to endNight
20%431%32%9%1
675
May1st to 15thNight
21%432%30%10%1
540
16th to endNight
22%216%37%18%1
375
June1st to 15thNight
23%217%36%19%1
360
16th to endNight
11%115%52%18%1
360
July1st to 15thNight
12%214%47%21%1
340
16th to endNight
11%213%47%22%2
376
August1st to 15thNight
11%115%43%25%1
545
16th to endNight
14%310%34%32%4
764
September1st to 15thNight
18%120%37%18%4
720
16th to endNight
18%218%29%25%5%
717
October1st to 15thNight
21%7%25%27%16%2
720
16th to endNight
22%8%31%27%8%
768
November1st to 15thNight
19%8%30%25%13%1
760
16th to endNight
19%10%33%25%10%
780
December1st to 15thNight
23%12%34%22%6%1
780
16th to endNight
24%11%41%20%2
832
Page generated at 2018-01-12 22:01:24. Version ac04

Copyright 2018 A. Danko


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