Nicholia
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Nicholia clear sky chart from 2005-11-06 to 2024-03-01.

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
51%
23805
19%
80461
15%
23724
56%
23724
26%
48619

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
45%
785
17%
4391
9%
774
50%
774
12%
2633
January11th to 20thNight
46%
757
17%
4363
14%
740
55%
740
11%
2908
January21st to endNight
44%
830
11%
4604
14%
814
51%
814
12%
3059
February1st to 10thNight
34%
760
13%
2470
7%
760
42%
760
18%
1667
February11th to 20thNight
40%
742
14%
2350
10%
740
47%
740
24%
1518
February21st to endNight
42%
628
16%
1884
11%
628
49%
628
21%
1276
March1st to 10thNight
42%
722
14%
2120
9%
722
48%
722
25%
1392
March11th to 20thNight
48%
720
18%
1980
11%
720
54%
720
32%
1252
March21st to endNight
42%
792
13%
2178
7%
792
46%
792
23%
1491
April1st to 10thNight
41%
712
16%
1874
7%
712
47%
712
26%
1280
April11th to 20thNight
41%
533
18%
1601
10%
533
48%
533
27%
998
April21st to endNight
43%
540
16%
1620
10%
540
47%
540
26%
1053
May1st to 10thNight
50%
540
16%
1620
11%
540
55%
540
33%
933
May11th to 20thNight
55%
531
15%
1595
13%
531
58%
531
28%
1015
May21st to endNight
46%
496
11%
1522
11%
495
49%
495
21%
1025
June1st to 10thNight
57%
360
15%
1260
16%
360
61%
360
27%
747
June11th to 20thNight
52%
360
19%
1260
18%
360
60%
360
29%
717
June21st to endNight
73%
360
24%
1260
29%
360
78%
360
44%
586
July1st to 10thNight
77%
350
22%
1268
31%
350
81%
350
49%
548
July11th to 20thNight
77%
348
28%
1392
37%
348
85%
348
56%
517
July21st to endNight
76%
475
29%
1565
33%
449
80%
449
51%
686
August1st to 10thNight
68%
537
25%
1602
22%
534
70%
534
41%
857
August11th to 20thNight
78%
534
34%
1602
27%
534
80%
534
56%
740
August21st to endNight
67%
594
35%
1782
27%
594
71%
594
49%
873
September1st to 10thNight
69%
683
32%
1869
22%
683
74%
683
51%
979
September11th to 20thNight
69%
720
30%
1980
24%
720
73%
720
46%
1088
September21st to endNight
61%
720
30%
1980
21%
720
67%
720
44%
1109
October1st to 10thNight
55%
720
23%
2042
15%
720
61%
720
39%
1168
October11th to 20thNight
56%
720
27%
2160
21%
720
62%
720
38%
1186
October21st to endNight
50%
792
22%
2538
15%
792
58%
792
31%
1446
November1st to 10thNight
51%
740
21%
2405
19%
740
56%
740
27%
1474
November11th to 20thNight
43%
824
17%
2534
11%
824
50%
824
26%
1571
November21st to endNight
46%
950
18%
2660
12%
950
51%
950
30%
1665
December1st to 10thNight
44%
950
15%
2688
9%
950
49%
950
23%
1789
December11th to 20thNight
42%
949
13%
3396
8%
949
46%
949
18%
2284
December21st to endNight
32%
1031
8%
5046
6%
1026
38%
1026
12%
3089

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
47%48%7%46%6%7%8%40%
78259
Night
26%37%7%46%6%7%8%42%
81153
TransparencyDay
37%8%14%20%15%6%
77963
Night
34%9%15%22%14%5%
80970
SeeingDay
8%14%32%30%14%3
14145
Night
5%8%27%39%18%3
23845

By Month

Percentage Cloud Cover SW (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
45%13%13%6%8%9%8%9%25%
2504
11th to 20thDay
16%48%12%6%7%7%7%9%34%
2540
21st to endDay
112%6%11%9%5%6%5%5%7%33%
2960
February1st to 10thDay
16%410%10%5%8%7%7%8%33%
1710
11th to 20thDay
15%5%10%10%6%9%8%7%9%30%
1717
21st to endDay
15%5%11%11%6%9%9%7%9%27%
1570
March1st to 10thDay
16%410%8%6%10%8%7%8%32%
1845
11th to 20thDay
29%49%7%48%7%10%9%32%
1980
21st to endDay
29%5%12%10%7%7%7%8%8%25%
2178
April1st to 10thDay
310%5%9%8%46%7%8%10%30%
2082
11th to 20thDay
38%47%7%47%7%7%8%36%
2307
21st to endDay
410%5%8%7%6%7%6%7%8%33%
2340
May1st to 10thDay
49%48%7%47%6%7%9%36%
2340
11th to 20thDay
7%9%39%7%5%5%7%7%9%32%
2301
21st to endDay
10%13%5%9%7%5%6%6%6%8%25%
2744
June1st to 10thDay
8%7%47%7%45%6%8%10%34%
2700
11th to 20thDay
9%9%36%6%45%46%8%41%
2700
21st to endDay
34245%35%5%6%7%55%
2700
July1st to 10thDay
33245%35%5%7%9%54%
2650
11th to 20thDay
332443445%7%61%
2520
21st to endDay
5%425%5%35%5%5%6%54%
2657
August1st to 10thDay
6%6%25%6%45%6%7%7%46%
2328
11th to 20thDay
33135%35%5%6%7%59%
2299
21st to endDay
4425%5%35%5%6%7%54%
2574
September1st to 10thDay
5%42433445%5%61%
2088
11th to 20thDay
7%7%3443446%6%51%
1980
21st to endDay
7%6%25%5%33447%54%
1980
October1st to 10thDay
8%8%37%6%35%6%6%6%41%
1918
11th to 20thDay
47%46%5%35%5%5%6%51%
1800
21st to endDay
37%38%6%46%5%6%9%43%
1814
November1st to 10thDay
38%5%8%8%5%6%6%6%8%38%
1674
11th to 20thDay
26%49%8%46%7%6%8%39%
1625
21st to endDay
16%5%9%7%46%7%6%7%41%
1520
December1st to 10thDay
25%49%9%5%8%8%7%7%36%
1487
11th to 20thDay
17%6%11%10%7%7%7%8%8%28%
1685
21st to endDay
18%49%10%46%6%7%9%36%
2442
January1st to 10thNight
3312%11%5%7%7%7%10%33%
4470
11th to 20thNight
15%411%14%7%8%7%7%8%29%
4420
21st to endNight
110%6%11%10%6%6%6%6%7%33%
4698
February1st to 10thNight
17%5%10%10%5%8%7%6%9%33%
2470
11th to 20thNight
16%49%8%47%7%7%9%36%
2349
21st to endNight
15%39%9%6%9%8%8%10%32%
1884
March1st to 10thNight
16%410%7%5%6%6%9%11%34%
2120
11th to 20thNight
17%37%6%46%7%8%10%40%
1980
21st to endNight
37%49%8%5%7%7%7%8%34%
2178
April1st to 10thNight
29%48%7%47%7%7%7%37%
1874
11th to 20thNight
36%36%6%5%8%5%8%10%39%
1601
21st to endNight
48%48%7%45%5%7%8%40%
1620
May1st to 10thNight
26%45%5%46%6%7%10%46%
1620
11th to 20thNight
6%5%36%7%5%6%6%7%10%39%
1594
21st to endNight
11%8%46%7%37%5%7%10%33%
1522
June1st to 10thNight
5%5%47%7%35%6%7%10%41%
1260
11th to 20thNight
7%5%36%5%35%5%5%8%49%
1260
21st to endNight
232333445%8%61%
1260
July1st to 10thNight
2213325%46%10%63%
1305
11th to 20thNight
221132345%6%71%
1440
21st to endNight
22134245%5%8%65%
1657
August1st to 10thNight
43245%35%6%7%8%54%
1611
11th to 20thNight
211332446%7%66%
1602
21st to endNight
331343346%6%63%
1782
September1st to 10thNight
45%1321445%6%65%
1869
11th to 20thNight
4315%5%3445%7%59%
1980
21st to endNight
6%6%24423346%60%
1980
October1st to 10thNight
5%6%24435%5%7%9%49%
2042
11th to 20thNight
36%35%4345%5%8%53%
2160
21st to endNight
26%26%6%45%6%8%9%46%
2538
November1st to 10thNight
38%47%7%5%6%5%7%9%40%
2405
11th to 20thNight
16%47%7%47%6%8%9%40%
2534
21st to endNight
15%47%7%5%6%6%8%8%43%
2660
December1st to 10thNight
16%37%9%6%7%7%8%10%35%
2688
11th to 20thNight
16%410%10%5%7%7%8%10%31%
3506
21st to endNight
16%5%10%11%5%7%7%7%7%34%
5214

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
46%15%15%14%9%1
2504
11th to 20thDay
42%9%18%16%11%3
2540
21st to endDay
49%7%15%19%7%2
2960
February1st to 10thDay
40%13%21%18%8%
1710
11th to 20thDay
41%12%20%17%9%2
1726
21st to endDay
42%13%18%17%7%3
1570
March1st to 10thDay
39%10%21%19%9%1
1845
11th to 20thDay
38%11%22%18%9%1
1980
21st to endDay
47%12%21%16%41
2178
April1st to 10thDay
42%10%19%19%9%
2082
11th to 20thDay
38%8%19%23%12%1
2310
21st to endDay
40%8%18%27%7%
2340
May1st to 10thDay
38%9%16%26%11%1
2340
11th to 20thDay
44%8%15%24%9%
2304
21st to endDay
53%9%15%19%41
2744
June1st to 10thDay
42%8%19%25%7%
2700
11th to 20thDay
40%6%10%21%17%7%
2700
21st to endDay
25%5%9%25%30%6%
2700
July1st to 10thDay
23%6%9%23%26%14%
2578
11th to 20thDay
20%5%7%15%26%27%
2445
21st to endDay
27%6%6%11%28%22%
2509
August1st to 10thDay
33%7%9%16%25%11%
2313
11th to 20thDay
20%6%7%23%30%13%
2299
21st to endDay
26%6%8%22%24%15%
2574
September1st to 10thDay
23%5%6%19%28%18%
2088
11th to 20thDay
31%6%10%20%25%9%
1980
21st to endDay
29%5%11%26%23%7%
1980
October1st to 10thDay
39%6%14%22%15%4
1918
11th to 20thDay
32%6%16%28%15%3
1800
21st to endDay
34%8%16%25%15%2
1814
November1st to 10thDay
41%9%15%20%14%2
1674
11th to 20thDay
37%10%18%25%9%2
1625
21st to endDay
36%8%19%21%11%4
1520
December1st to 10thDay
39%11%17%17%10%4
1487
11th to 20thDay
46%11%18%16%8%1
1684
21st to endDay
40%11%12%18%9%8%
2442
January1st to 10thNight
38%12%13%22%13%1
4470
11th to 20thNight
44%13%10%19%9%4
4420
21st to endNight
48%8%15%17%9%2
4698
February1st to 10thNight
42%11%18%19%10%1
2470
11th to 20thNight
37%11%20%20%9%2
2350
21st to endNight
40%12%16%21%8%3
1884
March1st to 10thNight
38%10%19%23%8%2
2120
11th to 20thNight
33%9%20%23%13%2
1980
21st to endNight
40%11%21%22%6%1
2178
April1st to 10thNight
39%9%17%22%12%1
1874
11th to 20thNight
35%8%19%26%10%2
1601
21st to endNight
39%8%17%28%8%
1620
May1st to 10thNight
28%8%19%32%11%1
1620
11th to 20thNight
36%9%15%29%10%
1595
21st to endNight
43%9%19%21%7%
1522
June1st to 10thNight
34%8%18%30%10%
1260
11th to 20thNight
32%8%13%23%17%7%
1260
21st to endNight
21%5%11%26%29%9%
1260
July1st to 10thNight
16%6%11%22%31%15%
1268
11th to 20thNight
12%47%20%28%30%
1392
21st to endNight
16%5%6%17%33%22%
1565
August1st to 10thNight
24%7%11%20%23%15%
1602
11th to 20thNight
15%5%8%26%32%13%
1602
21st to endNight
19%5%10%23%26%16%
1782
September1st to 10thNight
19%5%7%19%30%19%
1869
11th to 20thNight
24%5%10%25%25%10%
1980
21st to endNight
26%5%9%27%28%5%
1980
October1st to 10thNight
28%6%16%30%17%3
2042
11th to 20thNight
26%6%16%34%17%2
2160
21st to endNight
30%8%19%26%16%1
2538
November1st to 10thNight
37%7%16%24%14%3
2405
11th to 20thNight
35%9%19%24%10%3
2534
21st to endNight
34%8%16%24%14%5%
2660
December1st to 10thNight
37%12%19%19%10%4
2688
11th to 20thNight
42%10%19%16%12%1
3507
21st to endNight
41%9%13%18%9%9%
5214

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
413%28%36%12%6%
180
11th to 20thDay
210%37%31%14%6%
180
21st to endDay
7%12%34%29%15%2
247
February1st to 10thDay
323%45%23%6%1
270
11th to 20thDay
418%37%27%11%3
322
21st to endDay
316%38%32%10%1
382
March1st to 10thDay
416%41%31%7%
421
11th to 20thDay
7%11%31%39%11%1
420
21st to endDay
8%16%35%29%11%1
462
April1st to 10thDay
8%18%31%29%12%3
420
11th to 20thDay
5%22%41%19%10%2
412
21st to endDay
9%18%31%26%12%3
420
May1st to 10thDay
7%18%27%31%15%2
423
11th to 20thDay
15%14%27%28%14%2
448
21st to endDay
16%10%23%29%16%6%
617
June1st to 10thDay
8%12%27%30%17%6%
630
11th to 20thDay
15%18%27%26%11%2
630
21st to endDay
6%10%29%33%18%3
630
July1st to 10thDay
6%10%29%31%20%4
573
11th to 20thDay
413%39%32%10%2
444
21st to endDay
5%10%36%31%15%4
487
August1st to 10thDay
9%10%30%33%16%3
447
11th to 20thDay
49%27%34%19%7%
437
21st to endDay
6%11%33%30%17%4
495
September1st to 10thDay
7%12%34%25%15%6%
450
11th to 20thDay
10%14%28%28%14%5%
450
21st to endDay
11%14%33%24%15%2
450
October1st to 10thDay
11%12%32%26%14%5%
388
11th to 20thDay
7%21%23%24%17%7%
270
21st to endDay
8%21%32%31%7%1
297
November1st to 10thDay
8%19%32%27%12%2
270
11th to 20thDay
416%32%36%9%3
270
21st to endDay
5%11%31%38%13%2
270
December1st to 10thDay
5%7%35%32%16%5%
255
11th to 20thDay
7%12%35%32%12%2
180
21st to endDay
416%35%29%14%2
198
January1st to 10thNight
38%30%43%13%2
798
11th to 20thNight
313%29%39%13%3
760
21st to endNight
411%30%40%13%2
836
February1st to 10thNight
313%37%36%9%2
760
11th to 20thNight
310%36%37%12%2
744
21st to endNight
48%34%39%14%2
628
March1st to 10thNight
38%34%42%11%1
722
11th to 20thNight
5%8%32%36%17%3
720
21st to endNight
6%13%27%38%14%2
792
April1st to 10thNight
6%12%31%34%13%4
712
11th to 20thNight
6%11%35%34%13%2
533
21st to endNight
9%9%29%34%15%3
540
May1st to 10thNight
5%10%29%35%18%3
540
11th to 20thNight
10%5%22%35%25%3
531
21st to endNight
15%8%20%30%23%4
497
June1st to 10thNight
8%5%21%38%24%3
360
11th to 20thNight
9%8%24%40%17%1
360
21st to endNight
3216%46%30%3
360
July1st to 10thNight
3213%47%32%3
350
11th to 20thNight
2315%54%25%2
348
21st to endNight
3112%47%33%4
475
August1st to 10thNight
6%214%46%28%4
537
11th to 20thNight
2213%48%30%4
534
21st to endNight
5%5%18%40%29%4
594
September1st to 10thNight
6%318%38%29%6%
683
11th to 20thNight
5%414%37%32%8%
720
21st to endNight
10%6%18%36%23%8%
720
October1st to 10thNight
7%6%26%37%20%4
720
11th to 20thNight
7%9%23%38%19%5%
720
21st to endNight
7%10%27%37%14%5%
792
November1st to 10thNight
6%7%27%41%16%3
740
11th to 20thNight
5%9%33%41%10%1
824
21st to endNight
311%32%37%15%3
950
December1st to 10thNight
5%11%32%41%10%2
950
11th to 20thNight
47%33%43%11%1
950
21st to endNight
5%13%36%35%10%2
1045
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