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 2018-08-29.

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%
16618
27%
50709
19%
16575
59%
16575
36%
28566

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
44%
970
29%
2522
14%
970
52%
970
35%
1539
January16th to endNight
43%
848
32%
2512
18%
848
54%
848
35%
1433
February1st to 15thNight
40%
764
29%
2286
15%
758
52%
758
34%
1265
February16th to endNight
31%
684
28%
2050
11%
684
45%
684
33%
1167
March1st to 15thNight
35%
674
27%
2234
14%
674
48%
674
30%
1268
March16th to endNight
32%
624
25%
2288
16%
624
45%
624
28%
1257
April1st to 15thNight
29%
584
26%
2080
15%
584
46%
584
30%
1124
April16th to endNight
29%
579
27%
1926
14%
579
47%
579
29%
1132
May1st to 15thNight
31%
585
23%
1755
16%
585
42%
585
30%
1046
May16th to endNight
45%
610
24%
1828
18%
609
56%
609
34%
1090
June1st to 15thNight
61%
585
24%
1755
21%
585
70%
585
52%
856
June16th to endNight
61%
585
20%
1755
21%
585
65%
585
39%
1006
July1st to 15thNight
72%
555
20%
1665
20%
555
75%
555
39%
941
July16th to endNight
83%
612
25%
1763
29%
579
85%
579
47%
908
August1st to 15thNight
86%
575
26%
1908
32%
572
88%
572
48%
898
August16th to endNight
74%
615
22%
2050
26%
615
76%
615
34%
1158
September1st to 15thNight
72%
540
20%
1980
23%
540
74%
540
30%
1123
September16th to endNight
64%
537
23%
1980
25%
537
66%
537
26%
1194
October1st to 15thNight
67%
540
32%
1980
33%
540
70%
540
39%
966
October16th to endNight
62%
697
39%
2233
29%
697
70%
697
49%
1058
November1st to 15thNight
55%
865
27%
2385
15%
865
60%
865
39%
1383
November16th to endNight
53%
975
34%
2535
17%
975
61%
975
44%
1443
December1st to 15thNight
48%
975
29%
2535
17%
975
53%
975
35%
1580
December16th to endNight
42%
1040
26%
2704
13%
1040
48%
1040
31%
1731

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%
51525
Night
11%413323347%54%
50914
Cloud CoverDay
14%5%24424446%46%
51523
Night
11%413323347%54%
50914
TransparencyDay
37%49%20%18%9%
51226
Night
30%411%21%19%12%
50716
SeeingDay
15%419%32%22%4
6558
Night
14%5%23%37%17%1
16624

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%6%23322345%50%
1746
16th to endDay
14%5%12314435%53%
2074
February1st to 15thDay
14%5%23322435%51%
1900
16th to endDay
18%412323445%50%
1710
March1st to 15thDay
20%5%23312345%48%
2054
16th to endDay
19%5%12313335%49%
2288
April1st to 15thDay
16%5%23313346%48%
2193
16th to endDay
15%435%323346%46%
2309
May1st to 15thDay
17%5%2442435%7%41%
2526
16th to endDay
19%5%24425%347%40%
2638
June1st to 15thDay
8%32342445%9%50%
2535
16th to endDay
12%5%35%446%6%5%8%35%
2535
July1st to 15thDay
13%5%245%35%5%5%7%41%
2535
16th to endDay
9%314425%46%10%46%
2642
August1st to 15thDay
3213445%46%10%53%
2294
16th to endDay
9%5%146%35%5%6%8%44%
2446
September1st to 15thDay
11%6%27%6%46%6%5%6%36%
1980
16th to endDay
14%6%25%6%3345%6%40%
1980
October1st to 15thDay
12%5%13324446%49%
1980
16th to endDay
10%312313335%60%
1977
November1st to 15thDay
17%6%24423445%45%
1801
16th to endDay
14%5%2421222456%
1755
December1st to 15thDay
19%6%24323236%45%
1755
16th to endDay
15%6%2432225%6%46%
1872
January1st to 15thNight
15%5%2332323454%
2522
16th to endNight
14%41431334454%
2512
February1st to 15thNight
13%5%13212245%56%
2282
16th to endNight
14%413323336%52%
2050
March1st to 15thNight
14%5%13322346%51%
2234
16th to endNight
15%5%12322346%53%
2288
April1st to 15thNight
12%413423347%53%
2080
16th to endNight
13%5%2442345%5%50%
1926
May1st to 15thNight
14%5%2431345%6%48%
1754
16th to endNight
13%313314348%51%
1827
June1st to 15thNight
32221336%8%64%
1755
16th to endNight
7%32341445%10%51%
1755
July1st to 15thNight
7%32333447%9%51%
1755
16th to endNight
5%2122145%6%11%55%
1873
August1st to 15thNight
211232445%9%61%
1919
16th to endNight
6%3245%25%46%9%49%
2050
September1st to 15thNight
8%5%235%35%36%11%45%
1980
16th to endNight
13%5%2442446%7%44%
1980
October1st to 15thNight
11%312212346%61%
1980
16th to endNight
7%31222123468%
2233
November1st to 15thNight
12%413212346%55%
2385
16th to endNight
11%41221224461%
2535
December1st to 15thNight
17%5%12223346%49%
2535
16th to endNight
16%7%24313325%49%
2704

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%51%
1746
16th to endDay
13%5%12323345%53%
2074
February1st to 15thDay
14%5%24322436%51%
1900
16th to endDay
17%413323345%50%
1710
March1st to 15thDay
19%6%23313335%47%
2054
16th to endDay
19%5%2231333449%
2286
April1st to 15thDay
16%5%14313345%48%
2193
16th to endDay
15%5%34423346%47%
2309
May1st to 15thDay
17%5%2442445%7%41%
2526
16th to endDay
19%6%2443435%6%40%
2638
June1st to 15thDay
8%32333445%9%50%
2535
16th to endDay
13%5%35%436%6%6%8%35%
2535
July1st to 15thDay
13%5%34435%5%5%7%41%
2535
16th to endDay
9%31443446%9%46%
2642
August1st to 15thDay
33135%345%6%9%53%
2294
16th to endDay
9%4245%46%45%8%43%
2446
September1st to 15thDay
11%6%27%6%46%5%5%7%36%
1980
16th to endDay
14%6%25%6%3345%6%40%
1980
October1st to 15thDay
12%5%24323446%50%
1980
16th to endDay
10%313313335%60%
1977
November1st to 15thDay
16%7%24333445%44%
1801
16th to endDay
14%5%2322322356%
1755
December1st to 15thDay
19%6%23323236%45%
1755
16th to endDay
15%7%2432225%6%47%
1872
January1st to 15thNight
14%5%2332333454%
2522
16th to endNight
13%424322345%53%
2512
February1st to 15thNight
13%423212245%56%
2282
16th to endNight
14%413323336%52%
2050
March1st to 15thNight
14%5%23323346%50%
2234
16th to endNight
15%5%13213345%53%
2288
April1st to 15thNight
12%32331335%7%52%
2080
16th to endNight
12%5%24333345%50%
1926
May1st to 15thNight
14%5%3431345%6%48%
1754
16th to endNight
13%423324338%51%
1827
June1st to 15thNight
32221346%9%64%
1755
16th to endNight
7%4233245%410%52%
1755
July1st to 15thNight
7%313335%46%9%51%
1755
16th to endNight
5%2122145%6%11%56%
1873
August1st to 15thNight
21232445%9%61%
1919
16th to endNight
6%3243345%6%9%49%
2050
September1st to 15thNight
8%5%2443446%11%45%
1980
16th to endNight
14%5%2432445%8%44%
1980
October1st to 15thNight
11%312212246%60%
1980
16th to endNight
7%31221123468%
2233
November1st to 15thNight
12%5%23312345%56%
2385
16th to endNight
11%412212335%61%
2535
December1st to 15thNight
16%5%12313346%49%
2535
16th to endNight
15%7%24312335%49%
2704

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%22%15%
1747
16th to endDay
34%26%14%25%16%
2074
February1st to 15thDay
36%26%14%19%19%
1901
16th to endDay
37%35%15%23%14%
1710
March1st to 15thDay
39%27%16%17%16%
2054
16th to endDay
38%37%18%18%14%
2288
April1st to 15thDay
37%37%16%17%17%
2193
16th to endDay
39%26%20%16%13%
2309
May1st to 15thDay
41%410%17%18%7%
2526
16th to endDay
44%48%20%17%3
2642
June1st to 15thDay
29%5%14%25%19%5%
2535
16th to endDay
43%6%11%20%15%2
2535
July1st to 15thDay
37%5%15%25%14%1
2396
16th to endDay
29%5%20%31%12%
2489
August1st to 15thDay
24%5%15%37%16%
2281
16th to endDay
35%6%15%27%12%2
2446
September1st to 15thDay
44%5%11%18%16%2
1980
16th to endDay
43%410%18%15%7%
1980
October1st to 15thDay
34%410%21%20%8%
1980
16th to endDay
26%35%16%28%20%
1977
November1st to 15thDay
41%37%20%16%10%
1801
16th to endDay
35%2314%21%22%
1755
December1st to 15thDay
42%25%16%20%11%
1755
16th to endDay
39%35%16%23%11%
1872
January1st to 15thNight
35%1417%21%19%
2522
16th to endNight
33%26%14%23%19%
2512
February1st to 15thNight
31%26%15%20%23%
2292
16th to endNight
33%27%15%23%17%
2050
March1st to 15thNight
34%39%14%20%18%
2234
16th to endNight
33%49%18%19%14%
2288
April1st to 15thNight
31%410%16%17%18%
2080
16th to endNight
35%49%19%15%15%
1926
May1st to 15thNight
35%412%20%15%11%
1755
16th to endNight
32%5%12%27%16%4
1829
June1st to 15thNight
17%5%16%29%25%4
1755
16th to endNight
28%6%18%25%17%3
1755
July1st to 15thNight
27%7%20%27%15%1
1665
16th to endNight
19%7%23%33%14%
1763
August1st to 15thNight
17%6%21%36%16%
1908
16th to endNight
30%6%20%26%13%2
2050
September1st to 15thNight
32%6%16%21%18%4
1980
16th to endNight
37%6%12%19%15%8%
1980
October1st to 15thNight
25%313%27%18%10%
1980
16th to endNight
20%26%16%30%23%
2233
November1st to 15thNight
31%38%22%21%13%
2385
16th to endNight
27%26%16%22%23%
2535
December1st to 15thNight
36%27%18%21%13%
2535
16th to endNight
38%26%15%21%15%
2704

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%8%29%32%7%
135
16th to endDay
20%8%29%30%9%
144
February1st to 15thDay
21%10%24%25%16%1
135
16th to endDay
35%5%34%20%5%
120
March1st to 15thDay
28%11%36%19%4
135
16th to endDay
18%442%30%4
144
April1st to 15thDay
15%15%39%26%3
192
16th to endDay
12%11%45%24%5%
321
May1st to 15thDay
20%9%34%27%6%
543
16th to endDay
25%425%32%10%
597
June1st to 15thDay
9%116%49%20%2
570
16th to endDay
14%112%38%26%6%
570
July1st to 15thDay
13%19%34%34%6%
550
16th to endDay
8%428%50%8%
563
August1st to 15thDay
46%40%38%9%
359
16th to endDay
11%17%34%35%9%
382
September1st to 15thDay
6%228%52%8%
135
16th to endDay
15%421%44%13%
135
October1st to 15thDay
7%8%36%34%12%
135
16th to endDay
12%322%31%26%3
144
November1st to 15thDay
30%418%28%14%2
135
16th to endDay
20%10%20%27%14%5%
135
December1st to 15thDay
28%5%17%30%15%2
135
16th to endDay
27%7%26%29%9%
144
January1st to 15thNight
18%9%22%38%10%
975
16th to endNight
18%6%25%37%12%
848
February1st to 15thNight
19%10%26%32%9%
764
16th to endNight
19%8%36%31%2
684
March1st to 15thNight
19%7%35%30%6%
674
16th to endNight
17%7%40%29%5%
624
April1st to 15thNight
13%10%45%28%2
584
16th to endNight
14%9%44%26%4
579
May1st to 15thNight
16%9%38%29%4
585
16th to endNight
15%331%40%9%
611
June1st to 15thNight
5%28%51%13%
585
16th to endNight
8%122%47%19%
585
July1st to 15thNight
8%110%49%27%1
555
16th to endNight
5%15%48%36%1
612
August1st to 15thNight
2442%47%2
575
16th to endNight
7%7%45%35%2
615
September1st to 15thNight
7%7%41%39%4
540
16th to endNight
16%11%34%33%3
537
October1st to 15thNight
11%115%39%29%2
540
16th to endNight
8%422%34%27%3
697
November1st to 15thNight
16%320%35%21%2
865
16th to endNight
14%5%20%36%18%2
975
December1st to 15thNight
20%5%21%35%14%1
975
16th to endNight
21%8%22%35%10%
1040
Page generated at 2018-08-30 04:34:17. Version ac04

Copyright 2018 A. Danko


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