Manheim Township Planetarium
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Manheim Township Planetarium clear sky chart from 2005-11-06 to 2024-11-01.

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
37%
24133
18%
95433
11%
23950
47%
23950
19%
59084

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 10thNight
20%
752
22%
4360
9%
737
39%
737
13%
2535
January11th to 20thNight
24%
760
23%
4155
9%
740
40%
740
12%
2421
January21st to endNight
21%
832
14%
4472
7%
814
39%
814
13%
2838
February1st to 10thNight
22%
760
18%
2470
9%
760
36%
760
19%
1609
February11th to 20thNight
15%
743
19%
2322
3%
740
34%
740
19%
1505
February21st to endNight
18%
628
21%
1884
7%
628
35%
628
18%
1264
March1st to 10thNight
24%
759
20%
3556
8%
745
41%
745
15%
2307
March11th to 20thNight
24%
755
24%
3449
9%
740
35%
740
18%
1733
March21st to endNight
24%
831
14%
3534
8%
814
35%
814
18%
2084
April1st to 10thNight
22%
760
19%
1900
4%
760
32%
760
23%
1309
April11th to 20thNight
33%
751
19%
1875
7%
751
38%
751
30%
1244
April21st to endNight
32%
760
19%
1900
6%
760
39%
760
28%
1288
May1st to 10thNight
38%
604
15%
2819
9%
601
44%
601
14%
1968
May11th to 20thNight
36%
370
10%
2487
12%
364
45%
364
9%
1699
May21st to endNight
52%
403
13%
2718
16%
399
57%
399
14%
1420
June1st to 10thNight
53%
380
20%
1520
20%
380
62%
380
23%
895
June11th to 20thNight
51%
380
15%
1520
17%
380
57%
380
23%
888
June21st to endNight
59%
380
17%
1520
20%
380
64%
380
26%
865
July1st to 10thNight
56%
362
15%
2362
17%
360
60%
360
12%
1348
July11th to 20thNight
69%
360
12%
2276
21%
358
72%
358
15%
1403
July21st to endNight
63%
534
11%
2646
14%
499
67%
499
17%
1699
August1st to 10thNight
66%
555
12%
2694
13%
545
69%
545
16%
1800
August11th to 20thNight
57%
652
16%
2690
12%
646
59%
646
18%
1706
August21st to endNight
61%
819
14%
3113
9%
814
63%
814
24%
1882
September1st to 10thNight
53%
760
23%
1900
11%
760
57%
760
33%
1256
September11th to 20thNight
62%
760
30%
1900
21%
760
65%
760
40%
1184
September21st to endNight
48%
760
21%
2147
16%
760
54%
760
24%
1463
October1st to 10thNight
44%
760
18%
2280
16%
760
50%
760
25%
1481
October11th to 20thNight
43%
760
22%
2280
17%
760
52%
760
31%
1368
October21st to endNight
37%
836
27%
2510
16%
836
50%
836
31%
1519
November1st to 10thNight
43%
743
25%
2414
15%
743
57%
743
32%
1352
November11th to 20thNight
33%
760
25%
2473
14%
760
47%
760
25%
1507
November21st to endNight
33%
760
21%
2660
12%
760
47%
760
23%
1558
December1st to 10thNight
25%
760
18%
2660
7%
760
39%
760
17%
1730
December11th to 20thNight
25%
760
18%
3184
7%
759
39%
759
17%
1942
December21st to endNight
26%
824
12%
4783
8%
817
41%
817
12%
3014

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
15%7%26%445%46%8%39%
101314
Night
16%7%26%44445%7%41%
97624
TransparencyDay
42%6%12%23%14%2
101078
Night
42%6%12%23%15%2
97480
SeeingDay
18%12%26%24%14%5%
14921
Night
18%9%29%31%12%1
24256

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 10thDay
15%7%36%44435%6%43%
2517
11th to 20thDay
14%11%49%6%5%436%6%32%
2710
21st to endDay
19%10%39%5%5%4346%32%
3124
February1st to 10thDay
15%8%36%45%5%5%6%7%37%
1710
11th to 20thDay
15%8%26%44435%8%40%
1744
21st to endDay
19%11%35%344445%37%
1570
March1st to 10thDay
24%7%24445%35%7%36%
3242
11th to 20thDay
10%6%26%5%5%5%46%8%43%
3480
21st to endDay
21%8%25%433245%43%
3963
April1st to 10thDay
16%7%27%445%46%7%39%
2280
11th to 20thDay
15%7%25%44445%7%43%
2254
21st to endDay
17%6%25%445%47%7%40%
2280
May1st to 10thDay
27%7%26%34445%7%30%
4084
11th to 20thDay
24%8%37%5%4445%6%29%
4398
21st to endDay
11%6%26%34446%10%45%
4837
June1st to 10thDay
12%6%25%5%5%5%47%9%40%
2660
11th to 20thDay
12%6%26%5%5%6%5%6%9%39%
2660
21st to endDay
10%425%5%45%5%6%11%43%
2660
July1st to 10thDay
6%426%5%6%6%6%8%11%39%
4440
11th to 20thDay
8%5%26%5%5%6%5%7%10%39%
4440
21st to endDay
10%7%28%6%5%6%5%7%8%35%
4579
August1st to 10thDay
18%6%27%5%5%6%46%9%33%
4104
11th to 20thDay
13%5%26%445%5%7%9%41%
3831
21st to endDay
11%5%25%34435%8%48%
4180
September1st to 10thDay
15%6%25%444346%46%
2280
11th to 20thDay
11%6%25%34345%8%50%
2280
21st to endDay
20%8%25%44445%6%38%
2027
October1st to 10thDay
17%6%25%33435%6%44%
1900
11th to 20thDay
17%5%26%344247%46%
1900
21st to endDay
16%6%25%43345%7%45%
2085
November1st to 10thDay
12%7%25%432348%50%
1671
11th to 20thDay
15%6%2444445%6%46%
1706
21st to endDay
15%6%26%5%3435%6%43%
1520
December1st to 10thDay
18%9%37%44346%7%36%
1520
11th to 20thDay
19%7%2444446%8%38%
1906
21st to endDay
17%7%38%6%6%5%45%6%33%
2772
January1st to 10thNight
15%7%26%5%5%445%7%40%
4429
11th to 20thNight
18%8%26%43435%7%40%
4248
21st to endNight
22%10%26%433346%36%
4532
February1st to 10thNight
17%9%36%45%435%6%39%
2470
11th to 20thNight
17%8%37%5%3435%5%41%
2320
21st to endNight
17%9%26%5%4345%5%39%
1884
March1st to 10thNight
21%10%35%443245%38%
3582
11th to 20thNight
11%6%26%44445%6%49%
3479
21st to endNight
15%8%36%433345%46%
3668
April1st to 10thNight
18%7%25%5%4435%8%37%
1900
11th to 20thNight
14%7%26%44345%8%43%
1875
21st to endNight
18%6%25%43435%7%44%
1900
May1st to 10thNight
24%7%27%5%4435%7%31%
2885
11th to 20thNight
23%10%48%44445%7%28%
2495
21st to endNight
11%6%26%44435%11%42%
2738
June1st to 10thNight
13%6%25%445%46%8%43%
1520
11th to 20thNight
12%5%25%45%45%7%11%40%
1520
21st to endNight
10%426%446%48%10%41%
1520
July1st to 10thNight
6%5%38%6%5%6%5%7%10%40%
2520
11th to 20thNight
7%5%38%6%6%6%5%8%11%37%
2520
21st to endNight
14%6%37%4445%6%8%38%
2956
August1st to 10thNight
19%6%26%45%5%46%8%34%
2825
11th to 20thNight
12%7%26%5%4446%7%42%
2966
21st to endNight
12%6%25%44436%8%46%
3476
September1st to 10thNight
13%6%36%44435%6%47%
1900
11th to 20thNight
12%6%2424336%7%51%
1900
21st to endNight
19%7%25%45%5%445%40%
2147
October1st to 10thNight
20%7%26%333245%44%
2280
11th to 20thNight
14%6%25%34335%6%49%
2280
21st to endNight
17%5%2333335%7%47%
2510
November1st to 10thNight
11%5%2434445%7%52%
2414
11th to 20thNight
15%7%35%44435%6%45%
2473
21st to endNight
14%5%25%44445%7%44%
2660
December1st to 10thNight
19%8%26%5%4445%7%37%
2660
11th to 20thNight
18%5%26%4445%5%7%40%
3288
21st to endNight
17%7%37%445%5%6%7%34%
4884

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 10thDay
42%414%26%11%3
2518
11th to 20thDay
51%412%18%13%2
2710
21st to endDay
52%5%12%22%8%1
3124
February1st to 10thDay
45%5%13%24%11%2
1710
11th to 20thDay
44%411%24%14%2
1753
21st to endDay
49%310%22%12%4
1570
March1st to 10thDay
46%5%10%26%10%2
3245
11th to 20thDay
36%5%11%28%16%3
3480
21st to endDay
46%49%21%18%3
3963
April1st to 10thDay
42%7%10%21%16%5%
2280
11th to 20thDay
39%6%12%23%16%5%
2254
21st to endDay
41%7%10%21%17%4
2280
May1st to 10thDay
52%6%10%20%10%2
4096
11th to 20thDay
54%7%13%18%8%1
4402
21st to endDay
33%7%14%27%16%2
4837
June1st to 10thDay
38%8%14%24%15%1
2660
11th to 20thDay
39%8%14%25%12%3
2660
21st to endDay
34%8%16%25%16%1
2660
July1st to 10thDay
35%11%15%21%14%3
4370
11th to 20thDay
36%9%16%25%14%1
4365
21st to endDay
44%8%11%19%17%1
4433
August1st to 10thDay
47%8%12%24%9%
4091
11th to 20thDay
37%7%12%28%15%1
3870
21st to endDay
33%7%11%28%20%2
4180
September1st to 10thDay
40%5%11%20%19%5%
2280
11th to 20thDay
32%5%10%26%22%4
2280
21st to endDay
46%5%8%18%19%3
2027
October1st to 10thDay
39%5%12%23%17%2
1900
11th to 20thDay
39%411%24%19%3
1900
21st to endDay
38%411%26%19%2
2085
November1st to 10thDay
35%314%25%19%4
1671
11th to 20thDay
39%5%11%23%20%2
1706
21st to endDay
41%5%12%30%11%2
1520
December1st to 10thDay
47%417%19%11%1
1520
11th to 20thDay
43%5%13%30%8%1
1906
21st to endDay
49%7%15%19%9%1
2772
January1st to 10thNight
42%6%12%26%11%3
4429
11th to 20thNight
44%5%13%25%12%2
4248
21st to endNight
49%410%27%9%1
4532
February1st to 10thNight
45%413%25%11%2
2470
11th to 20thNight
44%410%21%18%2
2322
21st to endNight
46%5%10%21%15%4
1884
March1st to 10thNight
48%410%24%12%1
3592
11th to 20thNight
34%5%12%32%15%2
3480
21st to endNight
42%47%21%22%4
3668
April1st to 10thNight
44%5%10%21%17%4
1900
11th to 20thNight
40%411%22%19%3
1875
21st to endNight
40%6%9%23%17%5%
1900
May1st to 10thNight
52%5%9%18%13%2
2892
11th to 20thNight
54%8%13%14%10%1
2496
21st to endNight
37%7%14%23%14%4
2739
June1st to 10thNight
38%7%11%22%20%2
1520
11th to 20thNight
36%9%15%24%16%2
1520
21st to endNight
35%7%14%26%16%2
1520
July1st to 10thNight
38%9%17%18%13%5%
2480
11th to 20thNight
38%10%15%22%13%1
2472
21st to endNight
41%8%15%18%17%1
2862
August1st to 10thNight
46%8%17%21%9%1
2814
11th to 20thNight
40%6%13%25%15%1
2993
21st to endNight
34%7%12%28%18%1
3476
September1st to 10thNight
37%7%10%21%21%4
1900
11th to 20thNight
32%5%9%25%25%4
1900
21st to endNight
45%6%8%18%20%3
2147
October1st to 10thNight
43%5%10%23%17%2
2280
11th to 20thNight
36%5%11%28%18%3
2280
21st to endNight
36%410%28%19%2
2510
November1st to 10thNight
32%412%27%20%4
2414
11th to 20thNight
39%49%25%18%5%
2473
21st to endNight
37%5%13%28%15%2
2660
December1st to 10thNight
46%5%13%22%13%1
2660
11th to 20thNight
43%5%14%22%14%3
3288
21st to endNight
46%7%15%22%10%1
4884

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 10thDay
26%22%31%18%22
180
11th to 20thDay
26%28%29%14%3
234
21st to endDay
24%23%32%17%41
297
February1st to 10thDay
24%19%39%14%4
270
11th to 20thDay
23%25%38%13%1
351
21st to endDay
30%16%32%18%4
382
March1st to 10thDay
19%22%31%22%5%
460
11th to 20thDay
21%23%33%18%41
460
21st to endDay
24%17%32%20%5%2
506
April1st to 10thDay
22%18%32%19%7%2
460
11th to 20thDay
19%18%29%20%11%3
452
21st to endDay
23%14%30%22%8%2
460
May1st to 10thDay
26%15%25%20%10%3
463
11th to 20thDay
20%12%27%23%13%5%
487
21st to endDay
18%5%23%26%19%9%
529
June1st to 10thDay
16%8%28%24%18%6%
490
11th to 20thDay
16%8%23%28%19%6%
490
21st to endDay
13%6%23%33%18%7%
490
July1st to 10thDay
12%318%27%27%13%
485
11th to 20thDay
5%317%35%29%11%
484
21st to endDay
13%322%32%23%7%
532
August1st to 10thDay
13%5%18%29%25%11%
486
11th to 20thDay
12%6%17%31%23%12%
479
21st to endDay
13%416%33%21%14%
539
September1st to 10thDay
19%5%18%22%24%12%
490
11th to 20thDay
13%419%27%23%14%
490
21st to endDay
25%10%22%22%15%7%
490
October1st to 10thDay
20%8%23%25%18%7%
490
11th to 20thDay
17%12%25%27%15%3
490
21st to endDay
16%12%33%26%10%3
536
November1st to 10thDay
16%10%28%27%15%3
365
11th to 20thDay
15%17%32%25%10%1
366
21st to endDay
19%21%34%18%8%1
180
December1st to 10thDay
24%20%34%16%42
180
11th to 20thDay
26%21%29%17%6%1
180
21st to endDay
23%17%31%21%8%
198
January1st to 10thNight
17%14%44%22%3
760
11th to 20thNight
23%14%33%26%4
760
21st to endNight
18%14%42%25%2
836
February1st to 10thNight
21%15%36%26%2
760
11th to 20thNight
22%18%40%19%1
743
21st to endNight
22%18%37%20%3
628
March1st to 10thNight
19%13%39%24%4
760
11th to 20thNight
20%16%36%22%5%1
760
21st to endNight
21%11%38%24%6%
836
April1st to 10thNight
20%16%37%22%4
760
11th to 20thNight
17%11%34%30%8%
751
21st to endNight
21%9%32%29%8%
760
May1st to 10thNight
22%7%28%34%8%1
609
11th to 20thNight
21%6%28%35%10%
374
21st to endNight
14%321%42%18%1
411
June1st to 10thNight
15%323%39%19%
380
11th to 20thNight
13%223%44%18%
380
21st to endNight
10%220%52%15%1
380
July1st to 10thNight
10%217%44%25%2
370
11th to 20thNight
6%114%46%30%2
368
21st to endNight
12%214%44%26%1
545
August1st to 10thNight
12%111%46%28%2
567
11th to 20thNight
13%313%39%30%2
667
21st to endNight
14%214%40%27%3
836
September1st to 10thNight
15%419%36%23%4
760
11th to 20thNight
14%314%38%28%4
760
21st to endNight
21%419%34%20%2
760
October1st to 10thNight
23%5%20%30%18%4
760
11th to 20thNight
18%7%27%34%13%1
760
21st to endNight
19%7%32%29%12%
836
November1st to 10thNight
13%7%32%35%13%1
743
11th to 20thNight
17%13%29%31%8%1
760
21st to endNight
16%13%34%29%8%
760
December1st to 10thNight
24%12%33%24%6%1
760
11th to 20thNight
18%12%39%26%5%
760
21st to endNight
20%11%37%30%2
836
Page generated at 2024-10-29 11:20:50. Version ac07

Copyright © 2024 Attilla Danko.


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