Moore-Gosch Memorial Park
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Moore-Gosch Memorial Park clear sky chart from 2005-11-05 to 2017-12-20.

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%
16355
20%
48102
11%
16308
46%
16308
28%
30280

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
25%
900
19%
2408
7%
895
35%
895
26%
1600
January16th to endNight
22%
960
18%
2496
6%
960
31%
960
25%
1726
February1st to 15thNight
25%
880
13%
2288
5%
876
30%
876
21%
1651
February16th to endNight
25%
711
21%
1973
5%
711
38%
711
27%
1288
March1st to 15thNight
31%
540
21%
1980
13%
540
43%
540
23%
1184
March16th to endNight
26%
576
11%
2112
7%
576
34%
576
15%
1478
April1st to 15thNight
29%
539
18%
1806
11%
539
40%
539
24%
1117
April16th to endNight
30%
540
20%
1738
12%
540
43%
540
21%
1163
May1st to 15thNight
38%
539
17%
1619
11%
539
46%
539
25%
1081
May16th to endNight
45%
563
21%
1497
10%
561
53%
561
32%
956
June1st to 15thNight
56%
540
17%
1440
8%
540
59%
540
38%
882
June16th to endNight
56%
540
19%
1440
9%
540
59%
540
41%
859
July1st to 15thNight
67%
510
18%
1360
11%
510
68%
510
43%
789
July16th to endNight
70%
564
21%
1593
18%
531
73%
531
43%
853
August1st to 15thNight
74%
539
22%
1610
24%
536
76%
536
41%
881
August16th to endNight
68%
573
23%
1835
25%
573
72%
573
37%
1013
September1st to 15thNight
60%
540
27%
1800
27%
540
65%
540
34%
982
September16th to endNight
56%
570
26%
1992
22%
570
64%
570
34%
1067
October1st to 15thNight
40%
720
24%
2160
16%
720
46%
720
31%
1307
October16th to endNight
33%
768
26%
2304
13%
768
45%
768
31%
1371
November1st to 15thNight
37%
809
25%
2436
13%
809
48%
809
33%
1392
November16th to endNight
27%
975
22%
2730
8%
975
39%
975
28%
1729
December1st to 15thNight
24%
975
15%
2730
5%
975
32%
975
21%
1900
December16th to endNight
22%
984
17%
2755
5%
984
33%
984
18%
2011

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%40%
48741
Night
11%7%35%424446%45%
48288
TransparencyDay
42%5%13%23%12%1
48431
Night
38%5%13%25%15%2
48104
SeeingDay
14%7%27%29%16%4
6259
Night
14%8%32%30%12%1
16356

By Month

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
10%10%47%5%35%346%36%
1528
16th to endDay
15%12%5%9%5%25%436%29%
1728
February1st to 15thDay
13%9%5%7%7%35%446%32%
1575
16th to endDay
14%8%38%5%24446%37%
1509
March1st to 15thDay
12%10%5%8%5%34446%34%
1980
16th to endDay
17%12%5%6%6%33345%30%
2110
April1st to 15thDay
17%9%35%423346%37%
2142
16th to endDay
23%8%36%5%33445%32%
2220
May1st to 15thDay
18%8%35%5%24446%33%
2331
16th to endDay
13%6%36%5%345%5%6%38%
2617
June1st to 15thDay
11%6%26%43446%8%40%
2520
16th to endDay
7%3235%45%5%7%9%45%
2520
July1st to 15thDay
8%414435%5%6%9%45%
2519
16th to endDay
5%3145%345%7%9%49%
2466
August1st to 15thDay
6%4245%45%5%6%10%43%
2340
16th to endDay
11%5%25%5%3345%7%44%
2366
September1st to 15thDay
13%41342335%7%51%
2160
16th to endDay
10%4244235%48%48%
1953
October1st to 15thDay
16%6%25%313335%47%
1800
16th to endDay
13%7%25%324445%45%
1920
November1st to 15thDay
9%7%24423446%49%
1749
16th to endDay
16%9%34413337%41%
1560
December1st to 15thDay
14%9%38%7%45%436%32%
1560
16th to endDay
13%12%6%9%6%23347%29%
1568
January1st to 15thNight
9%7%35%5%3445%6%41%
2408
16th to endNight
9%10%5%7%5%24446%39%
2496
February1st to 15thNight
13%10%5%8%5%34345%35%
2278
16th to endNight
11%8%45%42444444%
1973
March1st to 15thNight
12%8%35%323445%47%
1980
16th to endNight
18%9%36%5%2445%5%31%
2112
April1st to 15thNight
14%6%24423345%46%
1806
16th to endNight
18%9%25%423336%39%
1738
May1st to 15thNight
13%6%35%5%35%5%5%7%40%
1619
16th to endNight
9%4245%35%5%47%48%
1496
June1st to 15thNight
6%4144245%7%10%48%
1440
16th to endNight
5%3243345%6%9%52%
1440
July1st to 15thNight
6%213325%45%9%54%
1440
16th to endNight
42135%345%6%9%53%
1700
August1st to 15thNight
32144345%7%10%52%
1620
16th to endNight
7%3234235%5%7%53%
1835
September1st to 15thNight
10%32431345%5%54%
1800
16th to endNight
8%423324447%54%
1992
October1st to 15thNight
15%5%24423236%49%
2160
16th to endNight
13%6%2432333452%
2304
November1st to 15thNight
10%5%2431335%6%53%
2436
16th to endNight
14%8%34323345%46%
2730
December1st to 15thNight
13%12%36%423336%38%
2730
16th to endNight
16%10%48%6%23335%34%
2755

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
49%5%11%20%12%1
1529
16th to endDay
56%5%14%17%6%
1728
February1st to 15thDay
52%5%14%19%6%
1576
16th to endDay
47%413%21%11%
1509
March1st to 15thDay
49%5%13%21%8%1
1980
16th to endDay
54%5%12%19%6%
2112
April1st to 15thDay
48%410%26%9%
2142
16th to endDay
52%5%12%18%9%
2220
May1st to 15thDay
50%6%12%20%8%
2331
16th to endDay
44%7%13%23%10%1
2621
June1st to 15thDay
39%7%14%23%12%1
2520
16th to endDay
32%8%16%25%15%1
2520
July1st to 15thDay
33%6%16%26%12%3
2370
16th to endDay
27%6%17%32%14%1
2311
August1st to 15thDay
33%8%15%27%14%
2326
16th to endDay
37%6%12%23%16%4
2366
September1st to 15thDay
33%5%12%26%18%4
2160
16th to endDay
33%6%12%31%15%1
1953
October1st to 15thDay
40%39%24%19%3
1800
16th to endDay
39%5%10%26%15%2
1920
November1st to 15thDay
35%5%12%24%19%2
1749
16th to endDay
43%314%24%13%
1560
December1st to 15thDay
52%415%18%8%
1560
16th to endDay
55%412%17%8%1
1568
January1st to 15thNight
40%5%14%23%14%
2408
16th to endNight
45%416%21%10%
2496
February1st to 15thNight
50%313%21%9%
2288
16th to endNight
41%413%23%15%2
1973
March1st to 15thNight
39%5%12%26%14%1
1980
16th to endNight
52%6%13%18%8%1
2112
April1st to 15thNight
39%5%10%26%15%2
1806
16th to endNight
46%5%11%22%12%2
1738
May1st to 15thNight
42%6%13%22%14%
1620
16th to endNight
34%7%13%26%13%3
1498
June1st to 15thNight
28%8%17%26%15%2
1440
16th to endNight
27%7%15%26%20%3
1440
July1st to 15thNight
24%7%16%30%15%4
1360
16th to endNight
23%6%15%32%20%1
1593
August1st to 15thNight
23%8%17%32%16%2
1610
16th to endNight
28%6%12%25%19%7%
1835
September1st to 15thNight
31%48%29%21%6%
1800
16th to endNight
29%412%31%19%2
1992
October1st to 15thNight
36%310%22%21%4
2160
16th to endNight
35%310%26%21%3
2304
November1st to 15thNight
30%414%24%20%5%
2436
16th to endNight
39%310%29%14%1
2730
December1st to 15thNight
48%414%22%10%
2730
16th to endNight
53%411%18%10%1
2755

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
20%11%46%16%32
90
16th to endDay
26%9%40%17%6%
96
February1st to 15thDay
14%20%35%23%6%
90
16th to endDay
14%18%35%16%13%1
81
March1st to 15thDay
17%17%38%24%1
90
16th to endDay
33%13%35%14%3
96
April1st to 15thDay
21%12%33%23%8%1
261
16th to endDay
28%10%30%22%7%1
330
May1st to 15thDay
20%12%30%24%9%2
468
16th to endDay
18%8%30%26%14%1
517
June1st to 15thDay
13%323%35%20%3
495
16th to endDay
7%7%31%31%18%3
495
July1st to 15thDay
10%322%36%18%9%
475
16th to endDay
3117%44%27%5%
515
August1st to 15thDay
7%116%40%27%6%
493
16th to endDay
13%316%33%25%7%
406
September1st to 15thDay
10%320%26%30%7%
315
16th to endDay
9%7%24%38%14%7%
154
October1st to 15thDay
18%8%34%25%5%5%
135
16th to endDay
15%13%35%27%6%1
144
November1st to 15thDay
11%5%43%25%8%5%
135
16th to endDay
32%11%33%14%6%
135
December1st to 15thDay
14%25%38%13%5%2
135
16th to endDay
22%22%39%14%
108
January1st to 15thNight
12%13%42%22%8%
900
16th to endNight
15%12%42%24%4
960
February1st to 15thNight
18%11%38%27%4
880
16th to endNight
15%12%41%23%5%1
711
March1st to 15thNight
16%10%37%25%9%
540
16th to endNight
22%10%35%25%5%
576
April1st to 15thNight
17%12%37%27%5%
539
16th to endNight
22%8%34%25%8%1
540
May1st to 15thNight
14%8%34%34%8%
540
16th to endNight
10%6%33%33%15%
563
June1st to 15thNight
10%325%41%18%
540
16th to endNight
7%228%40%19%
540
July1st to 15thNight
5%219%41%28%2
510
16th to endNight
416%47%28%1
564
August1st to 15thNight
313%49%28%3
539
16th to endNight
9%114%39%31%3
573
September1st to 15thNight
12%217%33%29%3
540
16th to endNight
11%324%34%23%1
570
October1st to 15thNight
17%6%31%30%12%2
720
16th to endNight
16%10%36%28%8%
768
November1st to 15thNight
12%11%36%29%9%
809
16th to endNight
17%12%39%22%7%
975
December1st to 15thNight
20%13%36%24%4
975
16th to endNight
20%12%36%26%4
984
Page generated at 2017-12-21 06:04:42. Version ac04

Copyright 2017 A. Danko


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