Fire Panther Observatory
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Fire Panther Observatory clear sky chart from 2005-11-06 to 2024-01-13.

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
45%
23640
22%
74428
15%
23586
53%
23586
26%
46222

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
21%
760
21%
2459
8%
757
37%
757
18%
1590
January11th to 20thNight
25%
732
20%
2378
9%
732
38%
732
16%
1626
January21st to endNight
24%
792
27%
2439
11%
792
40%
792
22%
1554
February1st to 10thNight
26%
720
22%
2160
10%
720
38%
720
23%
1415
February11th to 20thNight
19%
703
18%
2098
6%
699
29%
699
17%
1438
February21st to endNight
19%
592
20%
1776
8%
592
30%
592
17%
1241
March1st to 10thNight
28%
720
23%
2160
12%
720
38%
720
24%
1364
March11th to 20thNight
28%
720
18%
1998
9%
720
36%
720
21%
1367
March21st to endNight
32%
792
20%
2178
10%
792
40%
792
24%
1462
April1st to 10thNight
40%
559
26%
1819
17%
559
51%
559
28%
1038
April11th to 20thNight
38%
533
27%
1775
18%
533
53%
533
31%
1019
April21st to endNight
48%
540
27%
1716
19%
540
58%
540
32%
976
May1st to 10thNight
50%
540
22%
1620
13%
540
58%
540
33%
955
May11th to 20thNight
54%
531
18%
1593
12%
531
59%
531
28%
1008
May21st to endNight
64%
582
19%
1744
15%
582
66%
582
30%
1090
June1st to 10thNight
62%
540
17%
1620
14%
540
65%
540
28%
1024
June11th to 20thNight
76%
540
19%
1620
15%
540
78%
540
42%
890
June21st to endNight
70%
540
17%
1620
13%
540
72%
540
34%
978
July1st to 10thNight
69%
525
15%
1575
14%
525
71%
525
27%
1036
July11th to 20thNight
71%
522
15%
1566
15%
522
72%
522
31%
962
July21st to endNight
69%
591
17%
1672
15%
558
71%
558
29%
1069
August1st to 10thNight
74%
537
17%
1646
19%
534
74%
534
29%
1041
August11th to 20thNight
66%
534
16%
1776
17%
534
67%
534
27%
1089
August21st to endNight
66%
594
19%
1980
22%
594
67%
594
23%
1284
September1st to 10thNight
68%
623
20%
1883
20%
623
69%
623
29%
1181
September11th to 20thNight
61%
720
22%
1980
18%
720
64%
720
31%
1273
September21st to endNight
60%
720
29%
1980
20%
720
66%
720
37%
1177
October1st to 10thNight
57%
720
32%
1980
25%
720
63%
720
41%
1122
October11th to 20thNight
45%
720
30%
2016
20%
720
56%
720
34%
1235
October21st to endNight
48%
792
31%
2471
26%
792
58%
792
33%
1400
November1st to 10thNight
50%
740
27%
2406
23%
740
58%
740
32%
1329
November11th to 20thNight
39%
760
29%
2470
19%
760
55%
760
32%
1387
November21st to endNight
37%
760
25%
2470
18%
760
48%
760
25%
1502
December1st to 10thNight
29%
760
22%
2470
13%
760
41%
760
18%
1664
December11th to 20thNight
32%
759
26%
2909
15%
758
43%
758
20%
1735
December21st to endNight
30%
827
13%
4405
11%
817
39%
817
11%
2701

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
13%6%36%6%35%5%6%7%39%
74848
Night
13%6%35%5%345%5%7%44%
74896
TransparencyDay
42%7%11%20%17%4
74571
Night
38%6%11%21%19%5%
74692
SeeingDay
17%12%23%22%17%8%
13570
Night
15%10%22%29%20%4
23652

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 10thDay
17%10%45%433446%41%
1706
11th to 20thDay
18%11%48%433345%38%
1638
21st to endDay
16%6%25%5%34445%45%
1913
February1st to 10thDay
17%10%37%435%445%37%
1800
11th to 20thDay
21%8%37%6%34445%36%
1748
21st to endDay
21%9%36%5%26%345%36%
1480
March1st to 10thDay
15%5%35%5%45%5%5%7%41%
1800
11th to 20thDay
19%8%37%6%345%45%36%
1962
21st to endDay
14%7%36%6%36%6%6%8%35%
2178
April1st to 10thDay
11%7%35%6%35%5%6%7%43%
2154
11th to 20thDay
13%6%26%6%345%46%45%
2134
21st to endDay
10%5%26%7%345%5%8%45%
2240
May1st to 10thDay
12%5%26%5%3445%7%46%
2340
11th to 20thDay
12%6%36%7%46%5%5%8%38%
2301
21st to endDay
10%5%25%6%47%6%8%9%38%
2531
June1st to 10thDay
10%5%37%7%46%7%7%9%35%
2340
11th to 20thDay
45%25%6%47%6%9%11%41%
2340
21st to endDay
7%5%36%6%5%6%7%7%11%38%
2340
July1st to 10thDay
9%6%37%9%5%8%7%8%10%29%
2340
11th to 20thDay
10%6%27%7%5%8%9%9%11%28%
2340
21st to endDay
7%6%36%8%48%9%8%11%29%
2547
August1st to 10thDay
7%5%26%8%6%9%8%9%11%28%
2276
11th to 20thDay
10%7%37%7%46%8%7%10%31%
2125
21st to endDay
13%6%38%7%5%8%7%6%7%31%
2376
September1st to 10thDay
10%7%36%8%45%8%6%7%36%
2057
11th to 20thDay
15%6%25%6%45%45%7%40%
1980
21st to endDay
13%5%35%5%3445%6%48%
1980
October1st to 10thDay
12%5%24434346%52%
1980
11th to 20thDay
10%6%34423446%53%
1941
21st to endDay
15%5%15%43445%5%51%
1882
November1st to 10thDay
12%5%23333446%55%
1672
11th to 20thDay
13%5%26%5%24445%50%
1710
21st to endDay
15%7%245%345%5%6%44%
1710
December1st to 10thDay
20%9%36%6%34435%37%
1710
11th to 20thDay
13%8%47%6%45%446%40%
2153
21st to endDay
18%9%5%7%5%2345%7%33%
3124
January1st to 10thNight
17%8%36%5%33445%41%
2459
11th to 20thNight
16%9%47%7%44446%35%
2378
21st to endNight
15%8%36%5%34445%43%
2439
February1st to 10thNight
15%8%35%6%24447%41%
2160
11th to 20thNight
19%7%46%5%35%44439%
2098
21st to endNight
21%8%46%43445%6%34%
1776
March1st to 10thNight
14%6%36%43445%6%44%
2160
11th to 20thNight
15%8%47%5%25%5%5%7%38%
1998
21st to endNight
12%7%37%6%4445%6%41%
2178
April1st to 10thNight
11%5%24435%5%6%8%48%
1819
11th to 20thNight
12%6%25%42345%7%50%
1775
21st to endNight
10%425%435%5%5%9%50%
1716
May1st to 10thNight
10%425%43446%7%51%
1620
11th to 20thNight
9%6%25%5%36%5%8%9%43%
1592
21st to endNight
8%5%26%5%46%5%6%10%43%
1744
June1st to 10thNight
7%5%26%7%46%5%8%10%40%
1620
11th to 20thNight
43245%245%6%12%53%
1620
21st to endNight
4425%5%36%6%7%13%45%
1620
July1st to 10thNight
9%436%7%46%6%9%10%37%
1620
11th to 20thNight
8%425%5%36%6%9%12%40%
1620
21st to endNight
6%5%26%6%37%7%8%12%38%
1771
August1st to 10thNight
7%4246%46%8%8%12%40%
1657
11th to 20thNight
9%5%36%6%345%7%10%42%
1776
21st to endNight
12%5%25%5%45%5%7%9%39%
1980
September1st to 10thNight
8%6%35%5%35%5%7%10%42%
1883
11th to 20thNight
13%5%35%5%3447%8%43%
1980
21st to endNight
11%424424447%53%
1980
October1st to 10thNight
11%424323336%59%
1980
11th to 20thNight
12%5%35%5%24345%52%
2016
21st to endNight
14%5%24423446%53%
2471
November1st to 10thNight
12%42342345%6%54%
2406
11th to 20thNight
12%5%35%42435%6%52%
2470
21st to endNight
15%7%35%5%3445%5%45%
2470
December1st to 10thNight
18%8%36%6%345%5%6%36%
2470
11th to 20thNight
16%7%36%424345%47%
3042
21st to endNight
18%7%47%6%45%5%6%7%30%
4532

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
44%48%21%19%4
1707
11th to 20thDay
51%37%17%19%3
1638
21st to endDay
41%48%23%20%5%
1913
February1st to 10thDay
49%37%20%19%3
1800
11th to 20thDay
51%45%20%16%4
1758
21st to endDay
50%48%13%19%6%
1480
March1st to 10thDay
42%5%8%16%22%7%
1800
11th to 20thDay
51%5%9%14%17%4
1962
21st to endDay
46%7%10%23%13%2
2178
April1st to 10thDay
39%7%10%22%18%5%
2154
11th to 20thDay
40%48%20%23%6%
2134
21st to endDay
37%411%29%17%2
2240
May1st to 10thDay
37%7%11%26%15%4
2340
11th to 20thDay
43%8%15%20%14%1
2305
21st to endDay
39%8%13%24%14%2
2531
June1st to 10thDay
43%9%14%20%12%1
2340
11th to 20thDay
33%9%18%25%13%2
2340
21st to endDay
37%10%17%20%12%3
2340
July1st to 10thDay
45%10%17%18%9%2
2275
11th to 20thDay
43%11%19%16%8%3
2271
21st to endDay
42%13%17%19%8%
2405
August1st to 10thDay
42%13%19%19%7%1
2263
11th to 20thDay
44%11%15%18%11%1
2125
21st to endDay
49%10%13%14%12%3
2376
September1st to 10thDay
43%9%13%16%14%5%
2057
11th to 20thDay
43%6%11%20%18%2
1980
21st to endDay
37%5%11%18%21%8%
1980
October1st to 10thDay
34%6%8%18%26%8%
1980
11th to 20thDay
32%410%21%24%9%
1941
21st to endDay
35%46%20%27%8%
1882
November1st to 10thDay
32%37%18%30%9%
1672
11th to 20thDay
36%46%20%25%8%
1710
21st to endDay
41%36%20%24%5%
1710
December1st to 10thDay
50%46%17%19%4
1710
11th to 20thDay
46%37%17%22%5%
2150
21st to endDay
49%410%19%16%3
3124
January1st to 10thNight
45%48%20%20%4
2459
11th to 20thNight
51%48%18%16%4
2378
21st to endNight
43%36%23%21%4
2439
February1st to 10thNight
44%49%19%20%4
2160
11th to 20thNight
49%47%19%16%6%
2099
21st to endNight
50%48%16%17%6%
1776
March1st to 10thNight
41%47%18%22%9%
2160
11th to 20thNight
45%6%10%18%17%4
1998
21st to endNight
44%49%24%16%2
2178
April1st to 10thNight
33%6%13%23%21%5%
1819
11th to 20thNight
35%48%23%21%10%
1775
21st to endNight
31%6%12%28%20%3
1716
May1st to 10thNight
32%6%13%22%24%3
1620
11th to 20thNight
35%10%18%22%15%1
1593
21st to endNight
35%8%14%25%15%3
1745
June1st to 10thNight
37%8%17%21%14%2
1620
11th to 20thNight
23%9%21%30%15%2
1620
21st to endNight
29%11%18%23%14%5%
1620
July1st to 10thNight
37%11%17%21%12%3
1575
11th to 20thNight
31%11%24%18%12%4
1566
21st to endNight
33%12%20%24%9%2
1672
August1st to 10thNight
32%12%21%24%10%1
1646
11th to 20thNight
35%9%22%17%14%2
1776
21st to endNight
39%11%16%19%12%3
1980
September1st to 10thNight
36%8%17%19%15%4
1883
11th to 20thNight
37%7%13%19%21%2
1980
21st to endNight
32%5%11%22%23%7%
1980
October1st to 10thNight
28%49%23%26%10%
1980
11th to 20thNight
35%47%22%22%10%
2016
21st to endNight
33%36%21%28%10%
2471
November1st to 10thNight
32%49%20%25%11%
2406
11th to 20thNight
34%36%20%27%10%
2470
21st to endNight
41%36%22%22%6%
2470
December1st to 10thNight
48%5%8%18%18%4
2470
11th to 20thNight
40%37%18%28%4
3044
21st to endNight
48%411%19%17%2
4532

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
27%26%33%12%2
270
11th to 20thDay
27%27%32%8%5%1
246
21st to endDay
20%31%34%11%3
264
February1st to 10thDay
30%27%32%9%3
240
11th to 20thDay
42%26%27%5%
240
21st to endDay
32%28%33%6%1
198
March1st to 10thDay
23%25%36%12%31
240
11th to 20thDay
24%25%26%18%6%
402
21st to endDay
21%19%36%17%6%
462
April1st to 10thDay
17%24%29%19%10%2
420
11th to 20thDay
17%21%29%19%13%1
412
21st to endDay
17%14%31%21%14%3
420
May1st to 10thDay
14%12%35%21%12%5%
423
11th to 20thDay
12%8%25%29%16%10%
447
21st to endDay
16%5%18%26%22%13%
485
June1st to 10thDay
14%6%18%29%19%14%
450
11th to 20thDay
6%5%15%28%26%20%
450
21st to endDay
10%421%27%22%16%
450
July1st to 10thDay
11%311%24%28%22%
445
11th to 20thDay
9%311%24%32%21%
444
21st to endDay
8%210%25%30%24%
488
August1st to 10thDay
12%413%24%30%18%
446
11th to 20thDay
13%310%32%28%14%
439
21st to endDay
16%211%25%29%16%
495
September1st to 10thDay
11%413%29%29%14%
450
11th to 20thDay
16%5%13%24%30%12%
450
21st to endDay
15%6%15%30%29%5%
450
October1st to 10thDay
15%6%22%26%22%8%
450
11th to 20thDay
13%12%29%30%16%2
450
21st to endDay
20%11%29%24%14%2
397
November1st to 10thDay
21%11%32%25%10%1
270
11th to 20thDay
17%18%40%21%4
270
21st to endDay
18%23%34%17%6%2
270
December1st to 10thDay
29%21%33%14%31
270
11th to 20thDay
20%21%35%18%6%
270
21st to endDay
30%20%31%15%31
297
January1st to 10thNight
23%21%31%21%4
760
11th to 20thNight
22%18%29%24%6%
732
21st to endNight
19%18%35%25%3
792
February1st to 10thNight
21%14%35%26%4
720
11th to 20thNight
24%21%33%20%2
703
21st to endNight
27%19%32%20%3
592
March1st to 10thNight
18%16%34%28%4
720
11th to 20thNight
19%18%29%25%8%1
720
21st to endNight
18%15%31%27%10%
792
April1st to 10thNight
13%15%28%33%11%
559
11th to 20thNight
16%11%32%29%12%1
533
21st to endNight
12%8%27%36%15%1
540
May1st to 10thNight
9%8%28%34%20%2
540
11th to 20thNight
12%5%22%31%23%6%
531
21st to endNight
10%411%34%36%5%
584
June1st to 10thNight
8%114%35%36%5%
540
11th to 20thNight
4211%36%35%12%
540
21st to endNight
5%111%32%41%10%
540
July1st to 10thNight
10%18%23%45%13%
525
11th to 20thNight
9%26%26%42%15%
522
21st to endNight
7%19%25%47%11%
591
August1st to 10thNight
8%15%23%49%14%
537
11th to 20thNight
11%29%30%40%7%
534
21st to endNight
13%29%26%41%9%
594
September1st to 10thNight
10%29%32%37%9%
623
11th to 20thNight
14%212%30%36%6%
720
21st to endNight
13%316%30%35%3
720
October1st to 10thNight
13%5%19%29%27%7%
720
11th to 20thNight
15%8%25%30%20%2
720
21st to endNight
17%8%20%36%17%3
792
November1st to 10thNight
16%7%21%34%19%2
740
11th to 20thNight
14%13%31%30%10%1
760
21st to endNight
19%13%27%30%11%1
760
December1st to 10thNight
22%16%26%28%7%
760
11th to 20thNight
20%14%29%27%9%
760
21st to endNight
24%16%25%30%6%
836
Page generated at 2024-01-10 10:16:13. Version ac07

Copyright 2024 Attilla Danko


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