Good Earth State Park
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Good Earth State Park clear sky chart from 2005-11-05 to 2019-06-02.

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
35%
18463
19%
53706
10%
18417
43%
18417
25%
34018

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
31%
1050
16%
2967
8%
1045
39%
1045
20%
2027
January16th to endNight
25%
1120
17%
2912
5%
1120
33%
1120
18%
2101
February1st to 15thNight
25%
1030
13%
2678
5%
1026
30%
1026
20%
1943
February16th to endNight
30%
809
18%
2279
7%
809
38%
809
22%
1532
March1st to 15thNight
31%
685
19%
2365
11%
685
41%
685
21%
1475
March16th to endNight
29%
672
13%
2464
10%
672
36%
672
16%
1626
April1st to 15thNight
28%
629
16%
2123
11%
629
39%
629
21%
1348
April16th to endNight
27%
624
17%
1871
10%
624
39%
624
19%
1273
May1st to 15thNight
34%
630
17%
1890
10%
630
42%
630
25%
1166
May16th to endNight
37%
658
16%
1818
5%
657
43%
657
25%
1172
June1st to 15thNight
43%
588
18%
1448
5%
588
46%
588
33%
899
June16th to endNight
46%
585
20%
1365
5%
585
51%
585
42%
804
July1st to 15thNight
56%
555
21%
1344
8%
555
59%
555
48%
757
July16th to endNight
61%
612
22%
1710
13%
579
69%
579
49%
829
August1st to 15thNight
64%
575
22%
1717
21%
572
68%
572
41%
923
August16th to endNight
57%
621
25%
1863
23%
621
63%
621
40%
1005
September1st to 15thNight
53%
585
24%
2055
22%
585
63%
585
35%
1046
September16th to endNight
44%
582
27%
2145
19%
582
58%
582
32%
1105
October1st to 15thNight
30%
731
26%
2291
14%
731
41%
731
27%
1355
October16th to endNight
36%
877
23%
2541
11%
877
45%
877
28%
1561
November1st to 15thNight
34%
1025
24%
2704
10%
1025
43%
1025
29%
1711
November16th to endNight
30%
1050
21%
2940
10%
1050
39%
1050
27%
1841
December1st to 15thNight
23%
1050
13%
2940
4%
1050
30%
1050
17%
2093
December16th to endNight
24%
1120
14%
3276
6%
1120
32%
1120
15%
2426

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
12%7%35%5%3445%7%41%
54609
Night
10%6%25%424447%45%
53880
Cloud CoverDay
13%7%35%5%3445%7%41%
54619
Night
10%6%25%42445%7%45%
53883
Cloud CoverDay
12%7%35%5%3445%7%40%
54620
Night
10%6%25%42445%7%45%
53884
Cloud CoverDay
12%7%35%5%3445%7%40%
54618
Night
10%6%35%42445%7%45%
53884
TransparencyDay
43%5%14%24%11%1
54301
Night
39%414%25%14%1
53706
SeeingDay
16%12%27%26%13%2
8317
Night
12%18%27%30%10%
18464

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
5%11%49%8%5%7%448%30%
1625
16th to endDay
8%12%6%10%8%35%5%5%5%25%
2016
February1st to 15thDay
11%9%5%10%6%45%5%45%29%
1845
16th to endDay
11%10%37%5%46%45%6%34%
1778
March1st to 15thDay
16%10%47%423347%36%
2243
16th to endDay
16%10%47%5%245%46%31%
2464
April1st to 15thDay
18%7%25%5%24346%37%
2482
16th to endDay
23%7%35%424446%33%
2694
May1st to 15thDay
18%6%25%5%3445%6%36%
2721
16th to endDay
18%6%245%25%45%8%35%
2998
June1st to 15thDay
14%6%25%42445%7%42%
2862
16th to endDay
9%41442446%8%48%
2925
July1st to 15thDay
6%31442435%9%55%
2869
16th to endDay
5%21333435%10%56%
2700
August1st to 15thDay
8%3245%35%6%7%9%43%
2486
16th to endDay
9%424424447%51%
2691
September1st to 15thDay
13%5%24423346%50%
2230
16th to endDay
11%41432335%6%53%
2145
October1st to 15thDay
16%6%2442233447%
1985
16th to endDay
14%7%23322345%49%
2031
November1st to 15thDay
10%6%26%5%33446%46%
1814
16th to endDay
10%8%46%5%45%45%7%37%
1680
December1st to 15thDay
10%11%5%9%6%35%45%5%32%
1680
16th to endDay
13%10%5%9%9%5%45%46%24%
1645
January1st to 15thNight
7%7%37%7%45%5%5%8%37%
2967
16th to endNight
8%11%47%6%35%45%7%34%
2912
February1st to 15thNight
11%10%48%6%34445%36%
2675
16th to endNight
8%8%37%5%3435%7%41%
2279
March1st to 15thNight
11%8%35%5%24446%43%
2353
16th to endNight
13%9%35%5%34447%38%
2464
April1st to 15thNight
15%6%25%424447%41%
2123
16th to endNight
17%8%35%434345%39%
1871
May1st to 15thNight
15%5%1442325%7%46%
1890
16th to endNight
13%5%244235%5%7%43%
1816
June1st to 15thNight
9%4144145%5%9%49%
1448
16th to endNight
6%213413448%59%
1365
July1st to 15thNight
5%11131345%7%62%
1418
16th to endNight
311121446%10%62%
1817
August1st to 15thNight
4113325%5%5%8%57%
1727
16th to endNight
7%313423447%58%
1863
September1st to 15thNight
8%31322245%6%58%
2055
16th to endNight
9%413213445%57%
2145
October1st to 15thNight
16%5%13213345%50%
2291
16th to endNight
13%6%14322336%51%
2541
November1st to 15thNight
10%5%25%423446%49%
2704
16th to endNight
8%6%25%5%3345%6%48%
2940
December1st to 15thNight
11%9%47%7%34446%34%
2940
16th to endNight
15%9%38%7%34446%31%
3276

Percentage Cloud Cover NW (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
5%10%5%9%8%47%448%30%
1626
16th to endDay
9%13%5%10%7%35%6%5%6%26%
2016
February1st to 15thDay
11%9%410%7%45%5%46%29%
1845
16th to endDay
11%9%36%6%35%5%46%34%
1778
March1st to 15thDay
15%10%46%323347%36%
2254
16th to endDay
16%10%47%5%245%5%6%31%
2462
April1st to 15thDay
18%6%25%5%3435%6%37%
2482
16th to endDay
23%7%34424346%34%
2694
May1st to 15thDay
18%6%345%3445%6%37%
2721
16th to endDay
19%5%245%3445%8%35%
2998
June1st to 15thDay
15%5%15%434448%42%
2862
16th to endDay
9%5%2432445%8%48%
2925
July1st to 15thDay
6%31342435%9%55%
2869
16th to endDay
5%21242446%9%57%
2700
August1st to 15thDay
8%4245%35%5%7%8%43%
2486
16th to endDay
9%424423447%51%
2691
September1st to 15thDay
13%5%15%322346%50%
2230
16th to endDay
12%42432235%6%53%
2145
October1st to 15thDay
16%6%2342333448%
1985
16th to endDay
14%7%24422345%49%
2031
November1st to 15thDay
10%7%26%5%33447%46%
1814
16th to endDay
11%9%36%5%35%5%5%7%37%
1680
December1st to 15thDay
10%11%410%6%35%35%5%32%
1680
16th to endDay
13%10%5%9%9%5%445%6%24%
1645
January1st to 15thNight
7%7%37%7%45%46%8%36%
2967
16th to endNight
8%10%5%7%6%3446%7%34%
2912
February1st to 15thNight
12%10%48%6%24345%36%
2668
16th to endNight
8%8%37%6%3435%6%41%
2279
March1st to 15thNight
11%8%26%5%235%46%43%
2365
16th to endNight
13%9%35%5%34447%38%
2462
April1st to 15thNight
15%7%25%424447%42%
2123
16th to endNight
17%8%35%434346%39%
1871
May1st to 15thNight
15%5%14322348%46%
1889
16th to endNight
14%5%2442445%7%44%
1817
June1st to 15thNight
9%42431445%9%49%
1448
16th to endNight
5%213313348%60%
1365
July1st to 15thNight
5%1132335%7%62%
1418
16th to endNight
31221445%10%63%
1817
August1st to 15thNight
32133345%5%8%57%
1727
16th to endNight
6%313323447%58%
1863
September1st to 15thNight
8%31322345%6%58%
2055
16th to endNight
10%423313346%57%
2145
October1st to 15thNight
16%5%14313345%50%
2291
16th to endNight
13%6%13322336%51%
2541
November1st to 15thNight
10%5%25%423446%49%
2704
16th to endNight
9%6%25%5%2345%7%48%
2940
December1st to 15thNight
10%10%47%6%35%45%6%35%
2940
16th to endNight
15%9%38%6%3445%6%31%
3276

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
5%10%49%9%47%45%8%29%
1625
16th to endDay
9%12%6%9%8%36%5%5%6%25%
2016
February1st to 15thDay
11%10%5%10%7%46%5%45%28%
1845
16th to endDay
11%10%37%6%36%448%33%
1778
March1st to 15thDay
15%10%5%6%423437%35%
2254
16th to endDay
15%11%46%6%3445%6%31%
2464
April1st to 15thDay
18%7%245%34447%36%
2482
16th to endDay
23%7%35%43335%6%34%
2694
May1st to 15thDay
17%6%35%5%3445%7%36%
2721
16th to endDay
18%6%25%5%3445%8%34%
2998
June1st to 15thDay
14%6%245%3345%8%41%
2862
16th to endDay
9%41442445%8%48%
2925
July1st to 15thDay
6%31332445%9%54%
2869
16th to endDay
5%21341446%9%56%
2700
August1st to 15thDay
8%4245%35%6%7%9%41%
2486
16th to endDay
9%42442445%6%51%
2691
September1st to 15thDay
13%5%145%23345%51%
2230
16th to endDay
12%424323346%52%
2145
October1st to 15thDay
16%7%2442324447%
1985
16th to endDay
13%7%24422346%48%
2031
November1st to 15thDay
10%7%26%43345%6%45%
1814
16th to endDay
11%8%37%435%45%8%36%
1680
December1st to 15thDay
10%12%410%7%34445%31%
1680
16th to endDay
14%9%6%8%9%5%5%5%45%24%
1645
January1st to 15thNight
7%7%47%6%45%46%8%36%
2967
16th to endNight
8%10%47%6%45%5%5%7%33%
2912
February1st to 15thNight
11%10%38%7%34446%36%
2668
16th to endNight
8%8%37%6%3436%6%40%
2279
March1st to 15thNight
11%7%36%5%23447%42%
2365
16th to endNight
13%10%36%5%2445%6%37%
2464
April1st to 15thNight
16%6%25%32445%7%41%
2123
16th to endNight
17%8%35%434346%38%
1871
May1st to 15thNight
14%5%2432335%7%46%
1889
16th to endNight
13%5%2442446%7%43%
1816
June1st to 15thNight
8%5%2442345%9%48%
1448
16th to endNight
6%33313448%59%
1365
July1st to 15thNight
42232445%7%62%
1418
16th to endNight
31222346%9%63%
1817
August1st to 15thNight
4113325%5%5%10%56%
1727
16th to endNight
7%22331345%7%58%
1863
September1st to 15thNight
8%31322245%7%58%
2055
16th to endNight
9%423223346%57%
2145
October1st to 15thNight
16%5%23322345%50%
2291
16th to endNight
13%7%23322336%51%
2541
November1st to 15thNight
10%5%25%42435%6%48%
2704
16th to endNight
9%6%25%5%33447%47%
2940
December1st to 15thNight
10%10%47%6%35%447%34%
2940
16th to endNight
15%10%37%6%345%5%6%30%
3276

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
5%11%49%8%47%5%48%29%
1625
16th to endDay
8%13%5%9%8%36%6%5%6%25%
2016
February1st to 15thDay
11%9%5%10%7%45%5%5%5%28%
1845
16th to endDay
11%10%47%7%35%5%48%32%
1778
March1st to 15thDay
15%10%5%6%414447%35%
2254
16th to endDay
15%11%37%6%3445%6%31%
2462
April1st to 15thDay
17%7%25%434446%36%
2482
16th to endDay
23%8%245%33345%34%
2694
May1st to 15thDay
17%6%25%6%3445%6%36%
2721
16th to endDay
18%7%245%25%45%7%34%
2998
June1st to 15thDay
15%5%3443445%8%41%
2862
16th to endDay
9%41442446%7%48%
2925
July1st to 15thDay
6%313415%46%9%54%
2869
16th to endDay
5%213325%45%9%55%
2700
August1st to 15thDay
8%415%5%35%6%7%9%41%
2486
16th to endDay
9%424424447%50%
2691
September1st to 15thDay
13%424423445%50%
2230
16th to endDay
12%5%23423346%52%
2145
October1st to 15thDay
16%7%2442324447%
1985
16th to endDay
13%7%24322345%48%
2031
November1st to 15thDay
10%7%26%5%3335%7%45%
1814
16th to endDay
11%9%36%435%5%6%7%36%
1680
December1st to 15thDay
10%11%410%7%35%45%5%31%
1680
16th to endDay
14%9%5%9%9%5%45%46%24%
1645
January1st to 15thNight
7%7%47%6%46%45%9%35%
2967
16th to endNight
8%10%47%5%45%45%8%33%
2912
February1st to 15thNight
11%10%37%7%34445%36%
2668
16th to endNight
7%8%36%6%3446%6%40%
2279
March1st to 15thNight
11%7%36%5%2345%7%42%
2365
16th to endNight
13%8%46%5%34447%37%
2464
April1st to 15thNight
15%6%25%423447%41%
2123
16th to endNight
17%8%35%433446%39%
1871
May1st to 15thNight
15%5%1442335%7%46%
1889
16th to endNight
12%6%2432446%7%43%
1816
June1st to 15thNight
8%4244135%5%9%48%
1448
16th to endNight
6%223413438%59%
1365
July1st to 15thNight
4212323447%62%
1418
16th to endNight
31221346%8%64%
1817
August1st to 15thNight
4113325%5%6%9%56%
1727
16th to endNight
6%32431345%7%58%
1863
September1st to 15thNight
7%314313347%58%
2055
16th to endNight
9%5%2322335%6%56%
2145
October1st to 15thNight
16%5%24313345%50%
2291
16th to endNight
13%7%23313346%50%
2541
November1st to 15thNight
10%6%25%5%23346%48%
2704
16th to endNight
9%6%25%433446%47%
2940
December1st to 15thNight
10%10%48%7%345%47%33%
2940
16th to endNight
15%10%37%7%345%46%30%
3276

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
52%5%15%17%9%
1626
16th to endDay
58%5%13%17%6%
2016
February1st to 15thDay
57%413%17%7%
1846
16th to endDay
49%7%13%18%10%
1778
March1st to 15thDay
49%414%22%8%
2254
16th to endDay
53%416%19%5%
2464
April1st to 15thDay
47%414%23%8%1
2482
16th to endDay
52%411%21%9%
2694
May1st to 15thDay
47%5%13%22%10%
2721
16th to endDay
46%6%13%21%10%
3002
June1st to 15thDay
41%6%15%24%10%1
2862
16th to endDay
33%5%16%28%13%3
2925
July1st to 15thDay
26%5%17%31%14%3
2714
16th to endDay
23%416%32%19%2
2544
August1st to 15thDay
36%8%15%27%11%1
2472
16th to endDay
33%5%12%29%15%3
2691
September1st to 15thDay
35%414%27%16%1
2230
16th to endDay
32%411%33%17%
2145
October1st to 15thDay
41%311%25%17%1
1985
16th to endDay
38%414%27%15%1
2031
November1st to 15thDay
39%315%24%15%1
1814
16th to endDay
46%416%21%10%
1680
December1st to 15thDay
54%414%18%7%1
1680
16th to endDay
60%411%14%7%1
1645
January1st to 15thNight
44%6%13%22%12%
2967
16th to endNight
49%5%15%21%8%
2912
February1st to 15thNight
50%412%21%9%1
2678
16th to endNight
43%5%13%23%12%2
2279
March1st to 15thNight
41%414%28%9%1
2365
16th to endNight
46%6%12%25%8%
2464
April1st to 15thNight
42%414%25%11%
2123
16th to endNight
47%310%22%13%2
1871
May1st to 15thNight
38%414%26%14%2
1890
16th to endNight
38%5%14%24%15%
1818
June1st to 15thNight
31%5%17%26%16%1
1448
16th to endNight
23%415%28%23%3
1365
July1st to 15thNight
20%5%14%33%19%6%
1344
16th to endNight
16%5%17%33%22%4
1710
August1st to 15thNight
23%6%16%33%18%2
1717
16th to endNight
25%415%29%18%5%
1863
September1st to 15thNight
26%414%30%20%3
2055
16th to endNight
28%411%34%19%1
2145
October1st to 15thNight
36%310%25%20%2
2291
16th to endNight
36%412%26%18%1
2541
November1st to 15thNight
36%312%24%19%2
2704
16th to endNight
36%5%16%27%13%
2940
December1st to 15thNight
51%415%21%7%
2940
16th to endNight
55%5%11%18%8%
3276

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
15%6%36%32%8%
180
16th to endDay
21%8%34%26%8%
192
February1st to 15thDay
17%13%38%27%2
180
16th to endDay
22%14%35%18%8%
159
March1st to 15thDay
31%8%33%21%5%
180
16th to endDay
25%7%34%18%11%3
192
April1st to 15thDay
25%17%29%19%6%
361
16th to endDay
27%19%24%18%8%2
586
May1st to 15thDay
19%17%24%26%9%1
618
16th to endDay
22%13%23%25%11%2
677
June1st to 15thDay
13%15%25%27%14%2
576
16th to endDay
10%15%32%27%12%1
570
July1st to 15thDay
5%10%24%33%20%5%
550
16th to endDay
5%12%21%34%23%2
595
August1st to 15thDay
8%8%19%34%24%4
549
16th to endDay
12%8%22%29%21%5%
603
September1st to 15thDay
14%6%28%31%16%3
265
16th to endDay
21%6%30%29%9%2
180
October1st to 15thDay
23%6%36%21%9%3
180
16th to endDay
16%9%41%22%7%1
192
November1st to 15thDay
15%10%32%27%11%3
180
16th to endDay
27%10%37%17%7%
180
December1st to 15thDay
20%12%36%17%12%
180
16th to endDay
23%11%38%20%4
192
January1st to 15thNight
9%22%28%29%8%1
1050
16th to endNight
14%22%29%26%6%
1120
February1st to 15thNight
15%21%30%24%6%
1030
16th to endNight
11%19%32%25%10%1
809
March1st to 15thNight
12%20%29%30%6%
685
16th to endNight
13%21%30%25%6%1
672
April1st to 15thNight
17%21%29%26%5%
629
16th to endNight
18%21%27%23%7%1
624
May1st to 15thNight
16%18%28%27%8%
630
16th to endNight
15%18%23%31%10%
659
June1st to 15thNight
12%18%21%33%13%
588
16th to endNight
7%18%25%37%11%
585
July1st to 15thNight
5%11%21%40%19%1
555
16th to endNight
316%16%42%20%
612
August1st to 15thNight
5%9%15%45%23%
575
16th to endNight
7%9%20%36%23%1
621
September1st to 15thNight
8%9%23%39%16%2
585
16th to endNight
11%11%30%32%13%1
582
October1st to 15thNight
17%15%31%25%8%
731
16th to endNight
16%14%28%30%9%
877
November1st to 15thNight
11%20%29%28%9%
1025
16th to endNight
10%22%32%26%7%
1050
December1st to 15thNight
15%21%30%26%6%
1050
16th to endNight
18%20%27%25%7%
1120
Page generated at 2019-06-02 18:43:06. Version ac04

Copyright 2019 A. Danko


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