Manic-5
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Manic-5 clear sky chart from 2005-11-05 to 2017-09-20.

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
22%
14470
9%
46824
4%
14438
27%
14438
12%
35942

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
18%
750
9%
2685
4%
746
24%
746
8%
2111
January16th to endNight
21%
774
12%
2724
6%
774
30%
774
12%
1987
February1st to 15thNight
21%
704
12%
2400
4%
701
31%
701
12%
1761
February16th to endNight
21%
631
9%
1969
4%
631
28%
631
10%
1561
March1st to 15thNight
22%
720
15%
2112
7%
720
31%
720
15%
1567
March16th to endNight
21%
768
15%
2088
5%
768
29%
768
15%
1580
April1st to 15thNight
19%
625
11%
1703
4%
625
25%
625
14%
1332
April16th to endNight
22%
540
12%
1620
8%
540
28%
540
16%
1180
May1st to 15thNight
27%
442
7%
1441
5%
442
31%
442
14%
1088
May16th to endNight
20%
375
7%
1309
2%
374
27%
374
13%
969
June1st to 15thNight
27%
360
2%
1260
0%
360
28%
360
14%
908
June16th to endNight
27%
360
1%
1260
0%
360
27%
360
12%
948
July1st to 15thNight
36%
340
2%
1190
0%
340
37%
340
16%
830
July16th to endNight
40%
376
6%
1283
7%
354
42%
354
16%
911
August1st to 15thNight
35%
413
6%
1484
6%
411
39%
411
13%
1115
August16th to endNight
31%
573
10%
1719
5%
573
35%
573
15%
1281
September1st to 15thNight
26%
656
8%
1823
3%
656
29%
656
16%
1362
September16th to endNight
20%
677
13%
1869
6%
677
26%
677
17%
1386
October1st to 15thNight
20%
660
11%
1944
5%
660
25%
660
13%
1475
October16th to endNight
16%
704
5%
2288
5%
704
18%
704
8%
1904
November1st to 15thNight
15%
722
7%
2409
4%
722
20%
722
7%
1986
November16th to endNight
17%
750
5%
2664
3%
750
19%
750
6%
2240
December1st to 15thNight
14%
750
3%
2700
1%
750
17%
750
7%
2198
December16th to endNight
19%
800
9%
2880
4%
800
26%
800
8%
2262

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
21%12%5%8%6%35%445%22%
48039
Night
18%12%5%8%7%35%45%6%22%
46976
TransparencyDay
63%5%10%14%7%
47709
Night
61%412%15%6%
46825
SeeingDay
30%13%26%18%8%2
6548
Night
25%13%30%21%7%
14470

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
14%15%6%10%9%35%5%6%6%15%
1253
16th to endDay
8%13%7%13%5%35%5%7%6%21%
1497
February1st to 15thDay
5%11%6%8%8%5%8%7%7%8%22%
1461
16th to endDay
9%17%7%11%10%346%5%5%17%
1503
March1st to 15thDay
12%12%6%10%8%45%5%4426%
1838
16th to endDay
11%18%6%8%6%34345%26%
2133
April1st to 15thDay
18%15%6%8%5%3443423%
2245
16th to endDay
18%11%47%6%34445%29%
2340
May1st to 15thDay
27%11%36%5%2444424%
2520
16th to endDay
26%10%36%5%2434426%
2805
June1st to 15thDay
25%8%36%5%34445%27%
2700
16th to endDay
29%9%47%6%35%5%4419%
2700
July1st to 15thDay
22%8%37%6%46%6%6%5%21%
2700
16th to endDay
20%7%38%7%46%45%5%25%
2795
August1st to 15thDay
26%9%37%7%35%5%5%6%18%
2454
16th to endDay
23%10%38%6%45%5%5%5%20%
2483
September1st to 15thDay
26%8%27%5%23345%29%
2136
16th to endDay
28%10%46%5%3333426%
1860
October1st to 15thDay
25%13%37%6%35%345%21%
1684
16th to endDay
32%20%5%8%5%3222313%
1584
November1st to 15thDay
24%16%7%9%7%3443414%
1448
16th to endDay
20%20%8%8%7%3433414%
1296
December1st to 15thDay
19%15%7%10%7%36%445%14%
1260
16th to endDay
11%16%9%11%7%5%6%445%17%
1344
January1st to 15thNight
14%16%6%9%8%36%6%6%6%14%
2685
16th to endNight
10%12%5%10%7%46%5%8%9%18%
2724
February1st to 15thNight
6%11%6%9%10%5%7%5%7%7%20%
2399
16th to endNight
10%14%7%10%9%48%5%6%7%16%
1969
March1st to 15thNight
12%12%5%9%7%36%5%6%5%25%
2099
16th to endNight
10%16%6%7%7%345%45%28%
2088
April1st to 15thNight
18%14%5%9%5%35%33426%
1703
16th to endNight
20%10%35%6%34435%31%
1620
May1st to 15thNight
25%10%46%5%34345%26%
1441
16th to endNight
24%9%36%433345%30%
1308
June1st to 15thNight
22%8%36%6%2446%6%28%
1260
16th to endNight
26%8%46%5%35%46%6%23%
1260
July1st to 15thNight
19%7%36%6%35%6%7%8%26%
1260
16th to endNight
17%7%26%446%6%5%7%30%
1370
August1st to 15thNight
23%7%26%5%45%46%6%26%
1494
16th to endNight
21%9%35%5%35%5%46%28%
1719
September1st to 15thNight
22%7%36%5%3445%5%30%
1823
16th to endNight
23%8%36%5%24335%32%
1869
October1st to 15thNight
23%9%37%6%2345%5%27%
1944
16th to endNight
29%15%5%10%6%2333415%
2288
November1st to 15thNight
21%14%5%10%7%35%44416%
2409
16th to endNight
22%17%6%9%7%4443413%
2664
December1st to 15thNight
16%16%7%10%9%45%5%45%15%
2700
16th to endNight
12%18%6%10%7%45%46%7%16%
2880

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
67%311%13%4
1254
16th to endDay
59%38%18%9%
1497
February1st to 15thDay
56%5%10%18%8%
1464
16th to endDay
67%38%14%5%
1503
March1st to 15thDay
60%29%16%10%
1848
16th to endDay
58%47%14%13%1
2133
April1st to 15thDay
65%37%12%10%
2245
16th to endDay
57%410%15%11%
2340
May1st to 15thDay
62%5%9%12%9%1
2520
16th to endDay
61%37%17%9%1
2809
June1st to 15thDay
58%5%8%16%10%1
2700
16th to endDay
66%5%8%11%6%
2700
July1st to 15thDay
60%7%12%12%7%
2541
16th to endDay
59%7%9%18%4
2620
August1st to 15thDay
64%7%13%11%2
2440
16th to endDay
62%7%13%12%3
2483
September1st to 15thDay
56%6%13%16%7%
2136
16th to endDay
60%412%17%4
1860
October1st to 15thDay
64%5%10%11%7%
1684
16th to endDay
76%37%8%2
1584
November1st to 15thDay
73%5%9%10%1
1448
16th to endDay
74%311%9%1
1296
December1st to 15thDay
72%314%8%2
1260
16th to endDay
68%39%13%4
1344
January1st to 15thNight
66%412%11%5%
2685
16th to endNight
58%312%17%6%
2724
February1st to 15thNight
58%39%18%8%1
2400
16th to endNight
65%39%14%6%
1969
March1st to 15thNight
58%29%19%9%
2112
16th to endNight
56%46%18%12%1
2088
April1st to 15thNight
61%48%11%12%1
1703
16th to endNight
54%410%16%12%
1620
May1st to 15thNight
59%410%16%9%
1441
16th to endNight
57%48%19%8%
1310
June1st to 15thNight
54%5%10%15%13%
1260
16th to endNight
57%7%11%13%9%
1260
July1st to 15thNight
48%9%17%18%5%
1190
16th to endNight
50%8%14%20%6%
1283
August1st to 15thNight
55%9%15%15%3
1484
16th to endNight
55%7%17%17%2
1719
September1st to 15thNight
53%7%15%19%4
1823
16th to endNight
54%413%21%4
1869
October1st to 15thNight
58%5%14%15%41
1944
16th to endNight
72%310%10%2
2288
November1st to 15thNight
69%412%10%1
2409
16th to endNight
73%412%7%1
2664
December1st to 15thNight
69%414%8%2
2700
16th to endNight
66%310%13%4
2880

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
21%16%26%28%6%
60
16th to endDay
25%14%20%28%12%
64
February1st to 15thDay
12%11%33%27%12%3
122
16th to endDay
25%16%30%17%7%2
226
March1st to 15thDay
22%19%31%18%5%2
270
16th to endDay
23%18%30%17%9%2
288
April1st to 15thDay
29%16%30%16%42
270
16th to endDay
30%16%27%14%8%2
270
May1st to 15thDay
35%14%21%18%7%3
369
16th to endDay
34%16%23%18%5%1
519
June1st to 15thDay
31%13%24%20%9%1
495
16th to endDay
33%12%25%19%7%1
495
July1st to 15thDay
24%10%25%24%11%2
475
16th to endDay
24%6%30%24%11%3
466
August1st to 15thDay
32%8%27%19%10%1
313
16th to endDay
30%10%27%16%9%5%
332
September1st to 15thDay
27%15%31%15%6%3
315
16th to endDay
32%20%26%11%7%2
270
October1st to 15thDay
29%16%26%16%9%2
234
16th to endDay
43%10%21%14%8%1
240
November1st to 15thDay
37%18%23%12%7%1
235
16th to endDay
38%12%35%8%5%
96
December1st to 15thDay
26%13%20%30%10%
60
16th to endDay
28%15%34%15%6%
64
January1st to 15thNight
23%14%32%22%6%
750
16th to endNight
16%13%36%24%8%
774
February1st to 15thNight
11%15%38%22%11%
704
16th to endNight
20%13%33%20%9%2
631
March1st to 15thNight
20%19%30%22%7%
720
16th to endNight
21%16%32%23%5%
768
April1st to 15thNight
26%14%33%18%6%
625
16th to endNight
29%13%30%17%8%
540
May1st to 15thNight
31%9%27%22%8%1
442
16th to endNight
28%11%34%21%4
375
June1st to 15thNight
24%13%27%26%7%
360
16th to endNight
30%6%30%24%7%
360
July1st to 15thNight
19%8%30%29%11%
340
16th to endNight
21%7%27%30%12%1
376
August1st to 15thNight
26%5%25%27%14%
413
16th to endNight
27%9%26%24%9%2
573
September1st to 15thNight
26%13%29%22%6%
656
16th to endNight
30%14%31%17%5%
677
October1st to 15thNight
31%14%27%19%6%
660
16th to endNight
38%10%25%16%6%1
704
November1st to 15thNight
32%15%28%14%7%1
722
16th to endNight
32%14%27%19%6%
750
December1st to 15thNight
25%16%34%17%5%
750
16th to endNight
25%14%30%19%8%2
800
Page generated at 2017-09-21 07:18:11. Version ac04

Copyright 2017 A. Danko


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