Sky Meadows State Park
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Sky Meadows State Park clear sky chart from 2005-11-05 to 2018-02-22.

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
38%
15896
21%
48952
12%
15860
48%
15860
25%
30718

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
22%
776
21%
2576
8%
776
38%
776
19%
1614
January16th to endNight
19%
832
22%
2704
8%
832
37%
832
20%
1710
February1st to 15thNight
22%
761
19%
2482
5%
761
38%
761
20%
1538
February16th to endNight
16%
659
23%
2021
6%
659
36%
659
20%
1265
March1st to 15thNight
24%
720
22%
1980
9%
720
37%
720
25%
1284
March16th to endNight
21%
768
20%
2112
8%
768
32%
768
22%
1399
April1st to 15thNight
25%
718
18%
1796
5%
718
34%
718
28%
1197
April16th to endNight
39%
719
19%
1799
7%
719
44%
719
29%
1198
May1st to 15thNight
40%
540
17%
1620
9%
540
45%
540
23%
1087
May16th to endNight
49%
399
18%
1522
16%
399
55%
399
24%
906
June1st to 15thNight
56%
360
19%
1440
19%
360
64%
360
26%
816
June16th to endNight
62%
360
18%
1440
20%
360
67%
360
27%
816
July1st to 15thNight
56%
375
12%
1395
13%
375
58%
375
21%
860
July16th to endNight
75%
564
17%
1595
14%
531
78%
531
38%
924
August1st to 15thNight
66%
539
18%
1609
15%
536
67%
536
30%
1048
August16th to endNight
64%
729
20%
1875
15%
729
65%
729
33%
1258
September1st to 15thNight
55%
720
24%
1800
14%
720
59%
720
33%
1196
September16th to endNight
52%
717
24%
1995
19%
717
57%
717
28%
1307
October1st to 15thNight
47%
720
23%
2160
20%
720
54%
720
27%
1365
October16th to endNight
38%
768
30%
2304
18%
768
53%
768
32%
1339
November1st to 15thNight
38%
760
24%
2372
14%
760
51%
760
28%
1426
November16th to endNight
32%
780
23%
2713
13%
780
49%
780
24%
1567
December1st to 15thNight
27%
780
18%
2730
7%
780
41%
780
18%
1751
December16th to endNight
25%
832
21%
2912
9%
832
42%
832
19%
1847

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%5%25%5%35%45%7%40%
49291
Night
13%5%2442445%7%43%
49138
Cloud CoverDay
14%5%25%5%345%5%7%40%
49301
Night
13%5%2442445%7%43%
49142
TransparencyDay
40%6%12%22%15%2
48995
Night
39%5%11%23%16%3
48952
SeeingDay
17%11%24%23%16%6%
6107
Night
16%10%28%29%13%1
15904

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
14%5%35%436%45%5%41%
1689
16th to endDay
15%8%25%434445%40%
1872
February1st to 15thDay
14%8%36%5%345%5%5%37%
1710
16th to endDay
14%7%345%3435%7%41%
1595
March1st to 15thDay
16%7%25%433326%44%
1969
16th to endDay
15%7%25%5%3446%6%37%
2112
April1st to 15thDay
13%5%25%5%25%45%7%42%
2151
16th to endDay
16%5%245%24446%43%
2171
May1st to 15thDay
19%4245%35%5%5%8%35%
2331
16th to endDay
15%5%25%5%35%5%5%8%38%
2593
June1st to 15thDay
11%4235%25%5%6%10%41%
2520
16th to endDay
9%325%5%26%6%6%9%41%
2520
July1st to 15thDay
10%5%36%7%36%5%6%7%38%
2479
16th to endDay
7%325%6%37%6%8%10%37%
2465
August1st to 15thDay
10%5%26%6%46%8%6%9%33%
2340
16th to endDay
12%415%435%6%6%9%39%
2315
September1st to 15thDay
14%5%245%34346%45%
2160
16th to endDay
15%5%25%5%25%45%6%41%
1963
October1st to 15thDay
20%414323346%45%
1800
16th to endDay
14%414433435%50%
1920
November1st to 15thDay
13%6%235%23446%47%
1816
16th to endDay
16%5%24423446%45%
1576
December1st to 15thDay
15%5%25%5%36%446%39%
1560
16th to endDay
16%7%16%44445%6%37%
1664
January1st to 15thNight
15%6%35%425%45%6%41%
2576
16th to endNight
15%8%25%423446%41%
2704
February1st to 15thNight
13%6%25%5%245%5%6%42%
2480
16th to endNight
12%8%26%42445%6%41%
2021
March1st to 15thNight
16%5%234245%5%6%42%
1968
16th to endNight
16%5%35%433345%41%
2112
April1st to 15thNight
13%6%25%5%25%45%6%41%
1796
16th to endNight
13%425%5%25%5%48%42%
1799
May1st to 15thNight
18%435%5%3446%8%37%
1620
16th to endNight
14%425%42435%8%43%
1520
June1st to 15thNight
10%323435%5%6%9%45%
1440
16th to endNight
9%42443447%10%44%
1440
July1st to 15thNight
10%5%25%5%446%7%9%38%
1478
16th to endNight
5%213435%6%8%12%45%
1703
August1st to 15thNight
8%5%25%5%36%5%7%8%41%
1620
16th to endNight
10%4135%35%5%6%9%43%
1875
September1st to 15thNight
13%4245%33447%46%
1800
16th to endNight
14%5%24434346%45%
1995
October1st to 15thNight
19%423423346%45%
2160
16th to endNight
13%423323446%53%
2304
November1st to 15thNight
13%6%34424435%48%
2372
16th to endNight
15%313425%447%46%
2713
December1st to 15thNight
15%6%36%5%35%5%46%38%
2730
16th to endNight
14%6%26%5%245%5%6%39%
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%426%5%35%5%46%41%
1689
16th to endDay
15%7%35%434446%40%
1872
February1st to 15thDay
14%8%25%6%25%5%5%5%37%
1710
16th to endDay
14%6%35%5%3345%7%41%
1595
March1st to 15thDay
16%6%25%5%33335%44%
1980
16th to endDay
16%6%35%5%3345%7%37%
2111
April1st to 15thDay
13%436%5%25%45%7%42%
2151
16th to endDay
16%5%24434446%42%
2171
May1st to 15thDay
19%425%435%5%5%8%35%
2331
16th to endDay
15%5%25%5%345%5%8%37%
2593
June1st to 15thDay
12%424435%5%7%10%41%
2520
16th to endDay
9%325%5%36%6%6%10%41%
2520
July1st to 15thDay
10%5%35%7%36%5%5%9%37%
2479
16th to endDay
7%315%7%46%6%7%10%37%
2465
August1st to 15thDay
10%5%26%7%46%7%6%8%33%
2340
16th to endDay
12%325%5%35%6%7%8%39%
2315
September1st to 15thDay
13%5%245%34446%45%
2160
16th to endDay
15%5%25%5%24446%42%
1963
October1st to 15thDay
21%5%23322335%46%
1800
16th to endDay
14%423423345%50%
1920
November1st to 15thDay
14%6%23423346%47%
1816
16th to endDay
16%5%24424346%46%
1576
December1st to 15thDay
16%5%25%5%35%447%39%
1560
16th to endDay
16%7%25%434447%38%
1664
January1st to 15thNight
15%5%35%42445%6%41%
2576
16th to endNight
15%8%25%324446%41%
2704
February1st to 15thNight
13%6%25%5%245%5%5%42%
2473
16th to endNight
12%7%36%5%245%46%41%
2021
March1st to 15thNight
15%6%134245%5%7%43%
1980
16th to endNight
16%5%35%433345%42%
2112
April1st to 15thNight
13%6%26%425%45%7%42%
1796
16th to endNight
14%425%5%35%45%8%42%
1799
May1st to 15thNight
18%5%245%2445%8%37%
1619
16th to endNight
14%5%15%43435%8%43%
1520
June1st to 15thNight
10%414425%6%7%7%45%
1440
16th to endNight
8%42443447%10%43%
1440
July1st to 15thNight
10%5%25%5%45%6%7%9%38%
1478
16th to endNight
5%323435%5%9%12%45%
1703
August1st to 15thNight
7%6%25%445%5%7%9%40%
1620
16th to endNight
11%3245%35%5%6%9%42%
1875
September1st to 15thNight
13%425%5%2345%6%46%
1800
16th to endNight
15%5%25%424346%45%
1995
October1st to 15thNight
19%41433335%5%45%
2160
16th to endNight
13%31332335%5%53%
2304
November1st to 15thNight
13%6%24324435%48%
2372
16th to endNight
15%323324447%46%
2713
December1st to 15thNight
15%6%35%5%35%5%45%38%
2730
16th to endNight
15%5%35%5%2445%7%39%
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
43%411%21%15%3
1690
16th to endDay
43%312%22%14%2
1872
February1st to 15thDay
45%5%11%21%12%3
1712
16th to endDay
42%412%26%13%1
1595
March1st to 15thDay
42%310%24%15%3
1980
16th to endDay
45%5%11%18%17%2
2112
April1st to 15thDay
39%412%20%18%3
2151
16th to endDay
42%5%8%20%17%5%
2171
May1st to 15thDay
45%6%13%19%14%1
2331
16th to endDay
42%7%13%24%10%2
2597
June1st to 15thDay
35%7%16%24%13%1
2520
16th to endDay
35%9%16%21%15%2
2520
July1st to 15thDay
41%8%12%20%13%2
2333
16th to endDay
37%7%14%24%14%1
2310
August1st to 15thDay
43%8%13%20%14%
2327
16th to endDay
37%8%13%26%12%1
2315
September1st to 15thDay
38%6%10%19%20%3
2160
16th to endDay
41%5%8%23%18%1
1963
October1st to 15thDay
40%410%25%14%3
1800
16th to endDay
35%39%28%21%2
1920
November1st to 15thDay
38%311%21%19%5%
1816
16th to endDay
38%410%26%17%2
1576
December1st to 15thDay
42%413%23%12%2
1560
16th to endDay
45%5%11%24%11%1
1664
January1st to 15thNight
41%411%19%17%5%
2576
16th to endNight
42%410%23%17%1
2704
February1st to 15thNight
40%5%12%23%15%2
2482
16th to endNight
41%311%26%15%1
2021
March1st to 15thNight
39%412%27%12%2
1980
16th to endNight
42%411%21%17%2
2112
April1st to 15thNight
40%410%22%17%3
1796
16th to endNight
39%5%12%20%15%7%
1799
May1st to 15thNight
43%6%10%22%13%2
1620
16th to endNight
38%6%16%23%13%1
1522
June1st to 15thNight
34%7%13%27%15%1
1440
16th to endNight
33%7%15%22%18%2
1440
July1st to 15thNight
39%8%17%18%11%4
1395
16th to endNight
26%8%19%25%17%1
1595
August1st to 15thNight
37%7%12%23%16%1
1609
16th to endNight
36%8%12%23%17%2
1875
September1st to 15thNight
37%6%11%21%20%3
1800
16th to endNight
40%5%6%23%20%2
1995
October1st to 15thNight
40%49%23%18%3
2160
16th to endNight
32%38%29%21%2
2304
November1st to 15thNight
37%39%22%19%7%
2372
16th to endNight
36%410%25%20%3
2713
December1st to 15thNight
44%5%11%23%13%2
2730
16th to endNight
42%5%14%23%12%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
21%34%24%16%2
122
16th to endDay
22%34%26%14%1
144
February1st to 15thDay
25%28%39%6%
135
16th to endDay
21%22%36%17%2
207
March1st to 15thDay
19%21%27%26%5%
270
16th to endDay
15%18%36%20%5%3
288
April1st to 15thDay
14%18%28%23%12%2
270
16th to endDay
24%9%25%18%18%4
270
May1st to 15thDay
24%15%26%16%11%4
288
16th to endDay
23%324%21%17%8%
331
June1st to 15thDay
12%9%24%25%21%7%
315
16th to endDay
11%5%29%29%18%6%
315
July1st to 15thDay
17%120%30%23%7%
305
16th to endDay
8%111%35%29%12%
326
August1st to 15thDay
14%218%26%26%12%
313
16th to endDay
11%115%28%26%17%
332
September1st to 15thDay
15%7%14%24%20%17%
315
16th to endDay
20%417%23%22%11%
314
October1st to 15thDay
24%415%26%21%7%
315
16th to endDay
13%13%33%19%16%3
336
November1st to 15thDay
18%10%26%27%13%3
304
16th to endDay
22%17%31%18%8%
106
December1st to 15thDay
18%24%28%17%10%
90
16th to endDay
25%18%36%17%2
96
January1st to 15thNight
19%20%32%23%4
780
16th to endNight
20%16%38%21%1
832
February1st to 15thNight
16%18%36%26%1
764
16th to endNight
18%21%38%19%1
659
March1st to 15thNight
20%15%36%23%3
720
16th to endNight
19%16%36%20%5%1
768
April1st to 15thNight
17%16%38%22%5%
718
16th to endNight
17%11%27%30%12%
719
May1st to 15thNight
22%5%25%30%15%
540
16th to endNight
17%319%38%20%1
400
June1st to 15thNight
8%224%36%25%1
360
16th to endNight
8%320%46%21%
360
July1st to 15thNight
12%217%36%28%2
375
16th to endNight
5%111%40%35%5%
564
August1st to 15thNight
11%110%43%29%2
539
16th to endNight
13%113%38%29%4
729
September1st to 15thNight
14%220%28%29%3
720
16th to endNight
17%317%29%28%3
717
October1st to 15thNight
22%5%19%27%21%3
720
16th to endNight
16%11%30%28%12%
768
November1st to 15thNight
15%10%29%30%12%1
760
16th to endNight
17%14%30%26%9%
780
December1st to 15thNight
19%13%33%24%8%
780
16th to endNight
19%13%36%29%1
832
Page generated at 2018-02-23 11:21:28. Version ac04

Copyright 2018 A. Danko


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