Garner State Park
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Garner State Park clear sky chart from 2005-11-05 to 2017-09-17.

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
51%
15388
27%
46979
19%
15345
59%
15345
36%
26437

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
43%
895
28%
2327
14%
895
51%
895
35%
1434
January16th to endNight
43%
783
33%
2319
18%
783
55%
783
35%
1321
February1st to 15thNight
41%
704
30%
2106
15%
698
53%
698
35%
1144
February16th to endNight
32%
632
29%
1894
11%
632
47%
632
35%
1041
March1st to 15thNight
36%
622
28%
2062
15%
622
50%
622
31%
1155
March16th to endNight
32%
576
26%
2112
16%
576
45%
576
28%
1154
April1st to 15thNight
29%
539
26%
1920
14%
539
45%
539
30%
1049
April16th to endNight
29%
540
27%
1797
14%
540
47%
540
29%
1055
May1st to 15thNight
30%
540
22%
1620
14%
540
41%
540
31%
964
May16th to endNight
43%
562
24%
1684
18%
561
54%
561
32%
1032
June1st to 15thNight
62%
540
22%
1620
21%
540
69%
540
50%
805
June16th to endNight
61%
540
21%
1620
21%
540
64%
540
39%
925
July1st to 15thNight
72%
510
20%
1530
20%
510
75%
510
38%
872
July16th to endNight
81%
564
25%
1617
28%
531
84%
531
45%
851
August1st to 15thNight
87%
539
26%
1789
33%
536
87%
536
49%
839
August16th to endNight
73%
573
23%
1910
26%
573
75%
573
31%
1112
September1st to 15thNight
73%
540
20%
1980
23%
540
74%
540
30%
1123
September16th to endNight
67%
498
23%
1837
26%
498
68%
498
27%
1080
October1st to 15thNight
66%
495
34%
1815
34%
495
69%
495
39%
884
October16th to endNight
61%
639
37%
2047
27%
639
68%
639
48%
982
November1st to 15thNight
56%
797
29%
2197
17%
797
62%
797
41%
1244
November16th to endNight
52%
900
32%
2340
16%
900
59%
900
42%
1353
December1st to 15thNight
48%
900
30%
2340
17%
900
53%
900
35%
1453
December16th to endNight
43%
960
26%
2496
13%
960
49%
960
33%
1565

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%24424447%46%
47778
Night
11%413323347%54%
47184
Cloud CoverDay
14%5%24424446%46%
47776
Night
11%413323347%54%
47184
TransparencyDay
37%49%20%18%10%
47479
Night
30%411%20%19%13%
46986
SeeingDay
15%419%32%22%4
5318
Night
14%5%24%37%17%1
15394

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
14%5%23422346%50%
1611
16th to endDay
14%5%12314435%53%
1914
February1st to 15thDay
13%5%24322435%52%
1750
16th to endDay
15%31232345%5%53%
1580
March1st to 15thDay
20%5%23312235%49%
1896
16th to endDay
19%5%12323335%49%
2112
April1st to 15thDay
17%5%23313346%47%
2024
16th to endDay
16%435%323346%46%
2163
May1st to 15thDay
17%5%2442445%7%40%
2331
16th to endDay
20%5%24425%347%38%
2430
June1st to 15thDay
9%32342445%9%50%
2340
16th to endDay
13%5%35%436%6%5%8%36%
2340
July1st to 15thDay
13%5%245%36%5%5%7%39%
2340
16th to endDay
10%3145%25%46%10%43%
2436
August1st to 15thDay
3213445%46%10%53%
2160
16th to endDay
10%5%246%35%5%6%8%41%
2289
September1st to 15thDay
11%6%27%6%46%6%5%6%36%
1980
16th to endDay
13%6%25%5%3345%6%42%
1828
October1st to 15thDay
13%5%13324446%50%
1815
16th to endDay
10%412213335%60%
1812
November1st to 15thDay
15%6%24423445%47%
1659
16th to endDay
15%6%2421322454%
1620
December1st to 15thDay
19%6%23312236%46%
1620
16th to endDay
14%6%2432225%6%48%
1728
January1st to 15thNight
15%5%2332333453%
2327
16th to endNight
13%5%1431334454%
2319
February1st to 15thNight
11%5%1321224458%
2102
16th to endNight
12%413323336%55%
1894
March1st to 15thNight
15%5%13322346%52%
2062
16th to endNight
15%412312345%53%
2112
April1st to 15thNight
12%41342335%6%52%
1920
16th to endNight
13%5%2442335%5%50%
1797
May1st to 15thNight
14%5%24313446%49%
1619
16th to endNight
15%413414347%48%
1683
June1st to 15thNight
42221336%8%63%
1620
16th to endNight
7%32341445%10%51%
1620
July1st to 15thNight
7%323335%47%9%49%
1620
16th to endNight
5%213215%5%6%11%54%
1727
August1st to 15thNight
211232445%9%62%
1800
16th to endNight
7%3245%25%5%6%10%46%
1910
September1st to 15thNight
8%5%235%35%36%11%45%
1980
16th to endNight
12%4244245%6%7%46%
1837
October1st to 15thNight
11%312212345%61%
1815
16th to endNight
7%31322123467%
2047
November1st to 15thNight
11%313212346%58%
2197
16th to endNight
12%412212245%59%
2340
December1st to 15thNight
16%5%12223346%50%
2340
16th to endNight
15%6%23323325%51%
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
14%6%24323246%50%
1611
16th to endDay
13%5%12313345%54%
1914
February1st to 15thDay
13%5%23322435%52%
1750
16th to endDay
15%312323345%53%
1580
March1st to 15thDay
19%5%23212335%49%
1896
16th to endDay
19%5%2231333449%
2110
April1st to 15thDay
17%5%14323346%47%
2024
16th to endDay
15%434423346%46%
2163
May1st to 15thDay
17%5%2442445%7%40%
2331
16th to endDay
20%6%2443435%6%38%
2430
June1st to 15thDay
9%32333436%9%50%
2340
16th to endDay
13%5%35%436%6%6%8%35%
2340
July1st to 15thDay
13%5%345%35%5%5%7%39%
2340
16th to endDay
10%315%4345%6%10%44%
2436
August1st to 15thDay
33135%345%6%9%53%
2160
16th to endDay
10%4246%46%5%6%8%40%
2289
September1st to 15thDay
11%6%27%6%46%5%5%7%36%
1980
16th to endDay
13%6%25%5%3345%6%42%
1828
October1st to 15thDay
12%5%23323446%50%
1815
16th to endDay
11%313213335%60%
1812
November1st to 15thDay
15%6%24333345%46%
1659
16th to endDay
15%6%2321312354%
1620
December1st to 15thDay
19%6%23322236%46%
1620
16th to endDay
14%7%2332225%6%48%
1728
January1st to 15thNight
15%5%2332333453%
2327
16th to endNight
13%42332234454%
2319
February1st to 15thNight
11%42321224458%
2102
16th to endNight
12%413323337%54%
1894
March1st to 15thNight
15%5%23322336%52%
2062
16th to endNight
15%413222345%53%
2112
April1st to 15thNight
12%42331335%6%52%
1920
16th to endNight
13%5%24333345%50%
1797
May1st to 15thNight
14%5%3431245%6%48%
1619
16th to endNight
14%423324338%48%
1683
June1st to 15thNight
42221346%8%63%
1620
16th to endNight
7%3233245%410%52%
1620
July1st to 15thNight
7%313335%47%9%50%
1620
16th to endNight
5%2122145%6%11%54%
1727
August1st to 15thNight
211242445%8%62%
1800
16th to endNight
7%325%4345%7%10%46%
1910
September1st to 15thNight
8%5%2443446%11%45%
1980
16th to endNight
12%5%2432445%8%46%
1837
October1st to 15thNight
11%32212246%60%
1815
16th to endNight
8%312211235%67%
2047
November1st to 15thNight
11%41332345%58%
2197
16th to endNight
12%412212335%59%
2340
December1st to 15thNight
16%5%12213346%50%
2340
16th to endNight
15%6%23312335%51%
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
36%2418%21%16%
1612
16th to endDay
34%26%15%25%17%
1914
February1st to 15thDay
35%25%14%21%20%
1751
16th to endDay
33%25%17%25%15%
1580
March1st to 15thDay
39%27%16%17%17%
1896
16th to endDay
38%36%18%18%13%
2112
April1st to 15thDay
37%37%15%18%17%
2024
16th to endDay
39%26%19%17%13%
2163
May1st to 15thDay
41%410%16%18%8%
2331
16th to endDay
46%48%17%17%3
2434
June1st to 15thDay
30%5%13%25%20%5%
2340
16th to endDay
43%6%11%19%15%3
2340
July1st to 15thDay
38%414%25%14%1
2201
16th to endDay
31%6%21%30%10%
2283
August1st to 15thDay
23%5%15%37%16%
2147
16th to endDay
37%6%15%26%10%2
2289
September1st to 15thDay
44%5%11%18%16%2
1980
16th to endDay
41%410%18%16%8%
1828
October1st to 15thDay
34%39%22%21%8%
1815
16th to endDay
26%35%17%28%18%
1812
November1st to 15thDay
39%36%20%18%11%
1659
16th to endDay
36%2413%19%24%
1620
December1st to 15thDay
41%25%16%20%11%
1620
16th to endDay
38%25%16%24%12%
1728
January1st to 15thNight
36%1417%19%19%
2327
16th to endNight
33%26%15%22%20%
2319
February1st to 15thNight
29%26%14%21%25%
2112
16th to endNight
30%26%16%24%18%
1894
March1st to 15thNight
33%29%13%20%19%
2062
16th to endNight
33%49%18%19%14%
2112
April1st to 15thNight
32%410%16%17%19%
1920
16th to endNight
35%39%19%15%15%
1797
May1st to 15thNight
35%412%20%15%12%
1620
16th to endNight
35%6%12%24%16%5%
1685
June1st to 15thNight
18%6%15%28%25%4
1620
16th to endNight
28%6%18%25%18%3
1620
July1st to 15thNight
27%7%20%26%16%1
1530
16th to endNight
21%7%24%32%13%
1617
August1st to 15thNight
17%6%21%37%16%
1789
16th to endNight
32%7%20%25%12%2
1910
September1st to 15thNight
32%6%16%21%18%4
1980
16th to endNight
35%6%12%19%16%8%
1837
October1st to 15thNight
25%311%28%19%11%
1815
16th to endNight
21%25%17%30%22%
2047
November1st to 15thNight
29%37%22%23%14%
2197
16th to endNight
29%27%14%21%25%
2340
December1st to 15thNight
35%28%18%21%13%
2340
16th to endNight
36%26%16%21%17%
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
17%7%34%32%6%1
90
16th to endDay
20%9%34%26%8%1
96
February1st to 15thDay
12%14%27%26%17%1
90
16th to endDay
25%435%25%7%
81
March1st to 15thDay
32%7%33%20%6%
90
16th to endDay
14%5%38%36%5%
96
April1st to 15thDay
15%18%39%23%4
143
16th to endDay
13%11%43%24%6%
273
May1st to 15thDay
21%10%36%25%5%
468
16th to endDay
28%5%26%29%9%
517
June1st to 15thDay
10%115%47%22%2
495
16th to endDay
14%112%37%26%7%
495
July1st to 15thDay
13%210%37%31%6%
475
16th to endDay
9%428%49%7%
485
August1st to 15thDay
4440%39%10%
315
16th to endDay
13%18%36%30%9%
329
September1st to 15thDay
6%228%52%8%
135
16th to endDay
9%313%53%19%
93
October1st to 15thDay
8%6%45%31%7%
90
16th to endDay
14%219%32%30%1
96
November1st to 15thDay
26%6%22%28%13%2
90
16th to endDay
28%13%22%23%8%3
90
December1st to 15thDay
28%5%11%32%18%3
90
16th to endDay
25%6%32%30%5%1
96
January1st to 15thNight
18%10%22%38%9%
900
16th to endNight
18%6%26%37%11%
783
February1st to 15thNight
17%11%26%32%10%
704
16th to endNight
17%9%37%32%3
632
March1st to 15thNight
19%7%33%30%7%
622
16th to endNight
17%7%40%29%5%
576
April1st to 15thNight
13%10%45%28%2
539
16th to endNight
15%9%44%25%4
540
May1st to 15thNight
16%10%40%28%4
540
16th to endNight
16%331%38%9%
563
June1st to 15thNight
5%26%52%13%
540
16th to endNight
8%122%45%21%
540
July1st to 15thNight
8%111%50%26%1
510
16th to endNight
6%15%48%35%2
564
August1st to 15thNight
2341%50%2
539
16th to endNight
8%18%43%35%2
573
September1st to 15thNight
7%7%41%39%4
540
16th to endNight
14%10%33%35%4
498
October1st to 15thNight
12%216%40%27%2
495
16th to endNight
8%422%34%26%2
639
November1st to 15thNight
14%320%36%21%2
797
16th to endNight
16%5%21%36%17%2
900
December1st to 15thNight
20%6%22%34%14%1
900
16th to endNight
20%8%23%35%11%
960
Page generated at 2017-09-18 07:38:22. Version ac04

Copyright 2017 A. Danko


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