Maumelle
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Maumelle clear sky chart from 2005-11-05 to 2017-09-22.

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
48%
15669
26%
47089
18%
15623
56%
15623
33%
27516

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%
899
29%
2327
10%
895
43%
895
30%
1467
January16th to endNight
29%
960
28%
2496
10%
960
40%
960
31%
1585
February1st to 15thNight
28%
857
21%
2264
7%
853
37%
853
28%
1473
February16th to endNight
26%
613
29%
1875
11%
613
41%
613
29%
1089
March1st to 15thNight
30%
540
23%
1980
14%
540
41%
540
22%
1195
March16th to endNight
36%
576
21%
2110
16%
576
47%
576
24%
1257
April1st to 15thNight
34%
539
26%
1797
14%
539
51%
539
31%
985
April16th to endNight
39%
540
26%
1800
20%
540
52%
540
33%
996
May1st to 15thNight
46%
540
20%
1758
16%
540
55%
540
28%
1065
May16th to endNight
54%
563
23%
1684
18%
561
60%
561
32%
1020
June1st to 15thNight
76%
540
26%
1455
22%
540
80%
540
52%
788
June16th to endNight
73%
540
27%
1530
24%
540
76%
540
47%
823
July1st to 15thNight
69%
510
18%
1530
19%
510
72%
510
36%
880
July16th to endNight
84%
564
25%
1594
29%
531
84%
531
43%
857
August1st to 15thNight
77%
539
25%
1662
29%
536
79%
536
43%
877
August16th to endNight
77%
573
24%
1910
30%
573
78%
573
33%
1094
September1st to 15thNight
69%
540
27%
1800
30%
540
71%
540
35%
1010
September16th to endNight
67%
571
34%
1877
32%
571
71%
571
39%
990
October1st to 15thNight
57%
660
32%
1980
24%
660
62%
660
39%
1102
October16th to endNight
52%
704
36%
2112
24%
704
62%
704
40%
1135
November1st to 15thNight
49%
700
32%
2100
22%
700
58%
700
37%
1157
November16th to endNight
41%
741
29%
2343
20%
741
52%
741
30%
1368
December1st to 15thNight
37%
900
22%
2520
11%
900
46%
900
28%
1621
December16th to endNight
33%
960
24%
2585
11%
960
42%
960
27%
1682

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%5%2443445%7%44%
47762
Night
11%424323347%50%
47288
TransparencyDay
38%410%23%18%4
47463
Night
34%39%24%22%6%
47092
SeeingDay
13%6%19%27%24%9%
5722
Night
14%7%24%31%19%2
15670

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
18%6%1332333447%
1611
16th to endDay
16%5%25%423235%47%
1728
February1st to 15thDay
18%6%23313335%47%
1595
16th to endDay
17%6%35%5%33335%41%
1607
March1st to 15thDay
19%5%25%323345%41%
1980
16th to endDay
16%6%45%5%24346%41%
2110
April1st to 15thDay
14%5%15%323347%47%
2151
16th to endDay
14%6%26%5%2445%7%41%
2160
May1st to 15thDay
17%5%25%435%447%39%
2190
16th to endDay
9%436%6%37%6%6%8%36%
2430
June1st to 15thDay
7%3245%46%5%6%8%45%
2499
16th to endDay
5%3245%46%6%7%10%44%
2422
July1st to 15thDay
7%437%7%46%7%7%10%34%
2340
16th to endDay
5%3145%47%7%7%10%41%
2466
August1st to 15thDay
7%3245%47%6%6%9%40%
2286
16th to endDay
8%4246%45%5%7%8%41%
2292
September1st to 15thDay
13%5%134345%6%6%44%
2160
16th to endDay
13%312324446%51%
1881
October1st to 15thDay
13%5%14313346%51%
1650
16th to endDay
15%31222223459%
1760
November1st to 15thDay
11%5%22212246%57%
1758
16th to endDay
16%7%3431323449%
1611
December1st to 15thDay
18%7%33322235%45%
1440
16th to endDay
17%6%35%42433442%
1635
January1st to 15thNight
17%5%2421223451%
2327
16th to endNight
16%5%2422433451%
2496
February1st to 15thNight
17%6%34313235%46%
2257
16th to endNight
14%423413335%52%
1875
March1st to 15thNight
17%6%35%32334445%
1980
16th to endNight
15%6%25%424345%44%
2110
April1st to 15thNight
10%42433435%7%51%
1797
16th to endNight
10%425%32345%9%49%
1800
May1st to 15thNight
14%423324448%46%
1757
16th to endNight
8%425%435%45%8%46%
1683
June1st to 15thNight
221331446%9%58%
1455
16th to endNight
431342445%9%57%
1530
July1st to 15thNight
3235%6%35%5%6%12%45%
1620
16th to endNight
3134245%6%12%52%
1702
August1st to 15thNight
5%1135%3446%11%52%
1672
16th to endNight
5%4145%35%6%6%11%44%
1910
September1st to 15thNight
10%42432335%6%53%
1800
16th to endNight
7%31432445%7%55%
1877
October1st to 15thNight
10%413422336%56%
1980
16th to endNight
13%2331222462%
2112
November1st to 15thNight
10%423322346%56%
2100
16th to endNight
15%423413325%51%
2343
December1st to 15thNight
18%6%2432333446%
2520
16th to endNight
17%6%34423335%46%
2585

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
40%25%25%19%5%
1612
16th to endDay
40%27%24%21%4
1728
February1st to 15thDay
40%210%24%18%4
1597
16th to endDay
46%26%22%18%4
1607
March1st to 15thDay
45%29%18%18%6%
1980
16th to endDay
45%211%25%13%1
2112
April1st to 15thDay
37%310%24%18%5%
2151
16th to endDay
42%38%22%19%3
2160
May1st to 15thDay
44%411%17%18%3
2190
16th to endDay
42%5%14%23%12%1
2434
June1st to 15thDay
34%412%28%19%1
2499
16th to endDay
32%5%12%27%18%3
2422
July1st to 15thDay
38%7%14%25%12%1
2201
16th to endDay
32%6%16%27%15%1
2311
August1st to 15thDay
34%7%14%25%15%2
2272
16th to endDay
39%5%15%21%14%4
2292
September1st to 15thDay
38%311%19%18%7%
2160
16th to endDay
33%48%22%24%7%
1881
October1st to 15thDay
34%28%20%25%8%
1650
16th to endDay
29%2324%29%10%
1760
November1st to 15thDay
29%28%26%25%8%
1758
16th to endDay
40%26%19%24%6%
1611
December1st to 15thDay
43%110%23%15%5%
1440
16th to endDay
45%29%20%16%4
1635
January1st to 15thNight
38%15%22%27%4
2327
16th to endNight
38%26%24%22%6%
2496
February1st to 15thNight
41%16%23%20%6%
2266
16th to endNight
36%17%26%19%8%
1875
March1st to 15thNight
43%29%17%20%7%
1980
16th to endNight
41%29%25%19%2
2110
April1st to 15thNight
32%310%24%21%8%
1797
16th to endNight
32%310%24%24%4
1800
May1st to 15thNight
37%5%9%22%18%6%
1758
16th to endNight
35%5%15%25%17%1
1685
June1st to 15thNight
20%413%33%25%1
1455
16th to endNight
23%412%28%24%6%
1530
July1st to 15thNight
29%6%16%29%14%2
1530
16th to endNight
22%8%16%31%18%3
1594
August1st to 15thNight
24%416%32%18%2
1662
16th to endNight
31%7%14%25%18%3
1910
September1st to 15thNight
31%5%9%24%21%8%
1800
16th to endNight
27%48%23%26%9%
1877
October1st to 15thNight
30%28%21%23%12%
1980
16th to endNight
28%2420%33%11%
2112
November1st to 15thNight
30%26%24%24%12%
2100
16th to endNight
36%25%20%28%6%
2343
December1st to 15thNight
42%18%22%18%6%
2520
16th to endNight
42%28%21%19%4
2585

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
27%11%41%12%6%1
90
16th to endDay
18%29%32%13%6%
96
February1st to 15thDay
20%20%42%13%31
90
16th to endDay
16%24%41%11%41
81
March1st to 15thDay
26%18%43%10%1
90
16th to endDay
15%20%29%29%5%
96
April1st to 15thDay
15%13%33%26%10%
270
16th to endDay
22%9%24%24%17%1
270
May1st to 15thDay
19%7%30%25%14%2
327
16th to endDay
12%5%24%29%21%5%
517
June1st to 15thDay
9%113%35%30%10%
495
16th to endDay
5%316%34%28%11%
495
July1st to 15thDay
7%314%33%31%9%
475
16th to endDay
5%1325%41%21%
515
August1st to 15thDay
11%8%27%35%16%
439
16th to endDay
16%425%34%18%
332
September1st to 15thDay
12%19%23%41%12%
315
16th to endDay
10%115%32%27%13%
177
October1st to 15thDay
13%5%31%32%12%5%
90
16th to endDay
19%427%31%14%3
96
November1st to 15thDay
15%7%32%23%17%3
90
16th to endDay
36%16%22%16%6%1
90
December1st to 15thDay
20%15%31%14%14%4
90
16th to endDay
26%18%39%11%4
96
January1st to 15thNight
22%12%30%26%7%
900
16th to endNight
18%12%36%28%4
960
February1st to 15thNight
20%13%33%29%4
857
16th to endNight
18%13%38%25%2
613
March1st to 15thNight
20%9%35%30%5%
540
16th to endNight
17%8%32%32%9%
576
April1st to 15thNight
12%12%37%27%10%
539
16th to endNight
12%8%35%31%12%
540
May1st to 15thNight
14%5%27%37%13%
540
16th to endNight
11%422%33%24%3
563
June1st to 15thNight
312%42%36%5%
540
16th to endNight
5%11%41%34%5%
540
July1st to 15thNight
219%36%43%6%
510
16th to endNight
4428%50%10%
564
August1st to 15thNight
5%6%30%47%9%
539
16th to endNight
6%1433%46%6%
573
September1st to 15thNight
12%7%32%41%5%
540
16th to endNight
8%115%33%37%4
571
October1st to 15thNight
12%320%30%29%3
660
16th to endNight
14%5%25%34%19%1
704
November1st to 15thNight
11%9%24%35%18%1
700
16th to endNight
17%11%26%29%14%
741
December1st to 15thNight
22%6%29%33%8%
900
16th to endNight
22%11%28%30%7%
960
Page generated at 2017-09-23 05:43:38. Version ac04

Copyright 2017 A. Danko


Maumelle Clear Sky Chart | Charts Home