Muscatine
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Muscatine clear sky chart from 2005-11-05 to 2017-09-21.

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
34%
15983
19%
46904
10%
15940
42%
15940
23%
30350

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
24%
900
14%
2506
6%
895
31%
895
18%
1763
January16th to endNight
19%
960
14%
2532
4%
960
27%
960
17%
1826
February1st to 15thNight
21%
876
14%
2288
3%
876
28%
876
19%
1630
February16th to endNight
24%
645
20%
1907
6%
645
37%
645
20%
1255
March1st to 15thNight
27%
642
18%
2082
9%
642
36%
642
18%
1338
March16th to endNight
24%
576
12%
2047
7%
576
32%
576
14%
1436
April1st to 15thNight
23%
539
17%
1797
10%
539
34%
539
19%
1160
April16th to endNight
29%
540
18%
1800
11%
540
42%
540
17%
1209
May1st to 15thNight
30%
540
17%
1521
8%
540
39%
540
22%
1035
May16th to endNight
39%
563
20%
1497
7%
561
48%
561
26%
979
June1st to 15thNight
43%
540
16%
1440
7%
540
49%
540
28%
902
June16th to endNight
41%
540
17%
1440
7%
540
47%
540
31%
894
July1st to 15thNight
59%
510
19%
1360
11%
510
63%
510
39%
788
July16th to endNight
59%
564
24%
1439
16%
531
68%
531
39%
818
August1st to 15thNight
66%
539
22%
1610
22%
536
70%
536
39%
870
August16th to endNight
63%
573
23%
1904
25%
573
68%
573
32%
1058
September1st to 15thNight
59%
540
28%
1800
28%
540
64%
540
35%
947
September16th to endNight
55%
605
27%
1841
18%
605
63%
605
34%
1042
October1st to 15thNight
41%
660
27%
1980
18%
660
49%
660
30%
1168
October16th to endNight
31%
704
20%
2142
10%
704
41%
704
25%
1331
November1st to 15thNight
30%
700
25%
2276
15%
700
42%
700
25%
1343
November16th to endNight
24%
867
18%
2487
7%
867
34%
867
21%
1644
December1st to 15thNight
19%
900
14%
2520
5%
900
27%
900
15%
1845
December16th to endNight
18%
960
14%
2688
4%
960
27%
960
13%
2069

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%7%35%5%3445%7%38%
47956
Night
13%7%35%5%24346%42%
47076
Cloud CoverDay
13%7%35%5%3445%7%38%
47965
Night
13%7%35%5%24446%42%
47080
TransparencyDay
44%413%22%12%1
47645
Night
42%412%24%14%2
46905
SeeingDay
14%14%24%26%16%4
6009
Night
14%20%25%27%11%1
15987

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
12%11%5%8%8%4446%5%28%
1432
16th to endDay
14%13%8%8%7%33446%25%
1690
February1st to 15thDay
14%10%5%7%5%35%35%6%32%
1575
16th to endDay
13%8%38%6%3445%7%34%
1564
March1st to 15thDay
15%9%36%424446%36%
1876
16th to endDay
19%9%46%5%3445%6%30%
2175
April1st to 15thDay
17%9%5%6%424445%34%
2151
16th to endDay
23%8%245%33345%34%
2160
May1st to 15thDay
19%7%35%5%445%5%7%30%
2427
16th to endDay
15%6%35%5%25%5%5%8%36%
2617
June1st to 15thDay
12%5%25%5%35%5%6%8%40%
2520
16th to endDay
10%434435%5%6%7%44%
2520
July1st to 15thDay
8%3146%246%6%9%46%
2520
16th to endDay
6%423436%5%6%10%45%
2628
August1st to 15thDay
7%325%446%6%7%9%43%
2340
16th to endDay
11%42442446%8%45%
2297
September1st to 15thDay
12%313323447%52%
2160
16th to endDay
9%415%425%5%5%8%47%
1897
October1st to 15thDay
14%6%24322345%49%
1650
16th to endDay
18%6%16%423345%42%
1728
November1st to 15thDay
11%9%35%334447%42%
1582
16th to endDay
19%9%44423237%38%
1471
December1st to 15thDay
20%12%38%5%2434428%
1440
16th to endDay
19%14%6%7%6%23345%26%
1536
January1st to 15thNight
12%10%47%5%34446%35%
2506
16th to endNight
12%10%6%8%5%24346%34%
2532
February1st to 15thNight
14%10%45%5%24447%35%
2285
16th to endNight
14%8%36%5%22345%42%
1907
March1st to 15thNight
15%7%35%423446%42%
2070
16th to endNight
17%8%36%6%35%446%32%
2047
April1st to 15thNight
17%8%35%423346%40%
1797
16th to endNight
19%6%35%43435%6%37%
1800
May1st to 15thNight
17%6%26%5%34446%40%
1521
16th to endNight
10%325%5%346%5%8%43%
1496
June1st to 15thNight
10%5%24425%36%7%47%
1440
16th to endNight
8%4245%335%6%9%45%
1440
July1st to 15thNight
6%31332446%9%54%
1440
16th to endNight
5%2135%245%7%11%49%
1537
August1st to 15thNight
32245%2445%8%56%
1620
16th to endNight
9%32442435%6%53%
1904
September1st to 15thNight
10%41342335%6%56%
1800
16th to endNight
6%42442446%7%51%
1841
October1st to 15thNight
12%424423235%52%
1980
16th to endNight
16%6%245%23346%44%
2142
November1st to 15thNight
13%7%24323336%50%
2276
16th to endNight
18%7%25%413346%40%
2487
December1st to 15thNight
18%12%47%5%2434432%
2520
16th to endNight
21%13%47%6%23335%27%
2688

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
11%11%5%8%8%4445%5%28%
1432
16th to endDay
14%13%7%8%7%3435%5%25%
1690
February1st to 15thDay
14%10%5%8%435%446%32%
1575
16th to endDay
12%9%37%6%44447%34%
1564
March1st to 15thDay
15%9%46%5%25%346%36%
1887
16th to endDay
19%9%46%5%3445%6%30%
2173
April1st to 15thDay
17%9%5%6%423445%34%
2151
16th to endDay
22%8%25%5%33345%33%
2160
May1st to 15thDay
19%8%35%6%35%45%7%30%
2427
16th to endDay
15%6%35%435%5%5%8%35%
2617
June1st to 15thDay
11%6%25%5%35%5%6%8%40%
2520
16th to endDay
9%425%4346%6%7%44%
2520
July1st to 15thDay
7%315%435%6%6%9%45%
2520
16th to endDay
6%324436%6%6%10%45%
2628
August1st to 15thDay
6%415%5%45%6%7%9%43%
2340
16th to endDay
11%425%4345%5%8%45%
2297
September1st to 15thDay
12%313423446%52%
2160
16th to endDay
9%4245%25%45%8%47%
1897
October1st to 15thDay
15%5%34323245%49%
1650
16th to endDay
18%5%25%5%22436%42%
1728
November1st to 15thDay
11%8%35%42445%6%42%
1582
16th to endDay
18%10%44323337%38%
1471
December1st to 15thDay
20%12%39%5%25%345%28%
1440
16th to endDay
19%15%5%7%6%24345%26%
1536
January1st to 15thNight
12%9%5%6%5%35%446%35%
2506
16th to endNight
11%10%6%8%5%34346%33%
2532
February1st to 15thNight
14%11%45%6%2435%7%34%
2278
16th to endNight
14%8%36%5%23335%41%
1907
March1st to 15thNight
15%8%35%42335%6%41%
2082
16th to endNight
17%8%37%6%35%5%45%32%
2047
April1st to 15thNight
16%8%34433346%40%
1797
16th to endNight
19%6%36%42435%5%37%
1800
May1st to 15thNight
17%6%25%6%34346%39%
1520
16th to endNight
9%4345%35%5%6%8%43%
1496
June1st to 15thNight
10%5%25%415%46%7%47%
1440
16th to endNight
8%5%25%5%345%6%9%46%
1440
July1st to 15thNight
6%3133245%6%8%54%
1440
16th to endNight
42235%25%5%7%11%49%
1537
August1st to 15thNight
33144345%5%8%55%
1620
16th to endNight
9%225%423447%52%
1904
September1st to 15thNight
10%313323346%56%
1800
16th to endNight
6%425%3245%5%8%51%
1841
October1st to 15thNight
12%5%2442324452%
1980
16th to endNight
16%6%24423346%44%
2142
November1st to 15thNight
13%7%24313335%50%
2276
16th to endNight
18%8%25%423346%40%
2487
December1st to 15thNight
18%12%46%5%24335%32%
2520
16th to endNight
21%13%46%6%2333427%
2688

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
56%413%14%10%
1433
16th to endDay
60%313%16%6%
1690
February1st to 15thDay
53%315%21%5%
1576
16th to endDay
48%414%22%8%1
1564
March1st to 15thDay
48%415%22%7%
1887
16th to endDay
54%314%20%6%
2175
April1st to 15thDay
51%311%22%11%
2151
16th to endDay
52%310%18%12%1
2160
May1st to 15thDay
52%6%10%22%8%
2427
16th to endDay
45%6%13%20%13%1
2621
June1st to 15thDay
40%5%13%23%16%
2520
16th to endDay
36%6%13%23%18%2
2520
July1st to 15thDay
33%6%13%28%13%3
2371
16th to endDay
32%6%17%25%15%2
2463
August1st to 15thDay
34%7%14%26%16%1
2326
16th to endDay
36%6%11%26%15%3
2297
September1st to 15thDay
31%38%30%21%3
2160
16th to endDay
34%5%12%29%17%1
1897
October1st to 15thDay
37%210%26%20%1
1650
16th to endDay
43%413%24%12%1
1728
November1st to 15thDay
41%312%24%14%2
1582
16th to endDay
47%317%21%9%
1471
December1st to 15thDay
58%313%17%6%
1440
16th to endDay
61%412%12%8%
1536
January1st to 15thNight
49%314%18%12%
2506
16th to endNight
50%417%18%9%
2532
February1st to 15thNight
49%314%21%10%
2288
16th to endNight
45%313%24%11%1
1907
March1st to 15thNight
44%412%25%11%1
2082
16th to endNight
52%5%12%19%8%
2047
April1st to 15thNight
45%210%23%14%2
1797
16th to endNight
48%310%20%13%3
1800
May1st to 15thNight
45%413%22%13%
1521
16th to endNight
36%7%12%23%17%3
1498
June1st to 15thNight
35%413%24%18%3
1440
16th to endNight
33%5%13%22%20%4
1440
July1st to 15thNight
26%5%14%31%18%3
1360
16th to endNight
25%5%15%31%19%1
1439
August1st to 15thNight
26%415%31%17%4
1610
16th to endNight
31%5%10%27%19%5%
1904
September1st to 15thNight
28%39%28%26%4
1800
16th to endNight
29%5%10%31%19%2
1841
October1st to 15thNight
35%39%24%24%3
1980
16th to endNight
40%312%24%16%2
2142
November1st to 15thNight
36%311%24%18%4
2276
16th to endNight
45%212%27%11%
2487
December1st to 15thNight
54%312%21%7%
2520
16th to endNight
60%311%16%7%
2688

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
26%12%38%16%5%
90
16th to endDay
20%9%35%22%7%4
96
February1st to 15thDay
14%18%42%12%12%
90
16th to endDay
20%11%38%16%11%2
81
March1st to 15thDay
20%16%43%15%4
90
16th to endDay
29%13%30%16%8%1
159
April1st to 15thDay
18%20%28%21%10%
270
16th to endDay
28%20%23%16%8%2
270
May1st to 15thDay
17%21%31%19%8%1
432
16th to endDay
17%19%24%25%8%4
517
June1st to 15thDay
10%15%23%30%16%3
495
16th to endDay
10%17%28%26%14%3
495
July1st to 15thDay
8%10%19%32%18%9%
475
16th to endDay
7%13%15%32%24%6%
515
August1st to 15thDay
5%8%18%33%27%7%
493
16th to endDay
11%8%10%33%25%9%
337
September1st to 15thDay
9%6%16%32%26%7%
315
16th to endDay
10%9%17%28%27%7%
237
October1st to 15thDay
13%7%25%31%13%8%
90
16th to endDay
22%7%31%29%9%
96
November1st to 15thDay
412%30%24%21%7%
90
16th to endDay
43%12%26%14%21
90
December1st to 15thDay
25%15%32%17%8%
90
16th to endDay
26%19%41%10%2
96
January1st to 15thNight
14%25%29%23%6%
900
16th to endNight
15%24%30%24%4
960
February1st to 15thNight
16%25%30%22%5%
880
16th to endNight
16%22%31%25%3
645
March1st to 15thNight
16%24%25%24%7%
642
16th to endNight
16%23%30%22%5%
576
April1st to 15thNight
17%24%30%22%4
539
16th to endNight
19%22%24%25%7%
540
May1st to 15thNight
17%21%26%26%7%
540
16th to endNight
9%20%26%29%13%
563
June1st to 15thNight
12%17%21%35%12%
540
16th to endNight
8%18%26%33%12%
540
July1st to 15thNight
8%12%14%37%25%2
510
16th to endNight
5%17%12%34%27%2
564
August1st to 15thNight
410%10%41%29%2
539
16th to endNight
9%9%11%39%26%4
573
September1st to 15thNight
11%10%14%32%27%3
540
16th to endNight
8%12%18%33%24%2
605
October1st to 15thNight
13%14%24%27%18%1
660
16th to endNight
19%17%27%26%8%
704
November1st to 15thNight
14%23%29%24%8%
700
16th to endNight
17%23%31%20%6%
867
December1st to 15thNight
22%24%26%21%4
900
16th to endNight
24%24%26%21%3
960
Page generated at 2017-09-22 06:35:39. Version ac04

Copyright 2017 A. Danko


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