Fisher's Paradise
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Fisher's Paradise clear sky chart from 2005-11-05 to 2018-11-30.

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
29%
16621
13%
51589
8%
16590
34%
16590
16%
37288

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
17%
972
7%
2910
3%
970
20%
970
9%
2390
January16th to endNight
23%
897
10%
2801
6%
897
28%
897
11%
2212
February1st to 15thNight
20%
762
10%
2482
4%
761
26%
761
10%
1898
February16th to endNight
18%
683
10%
2200
5%
683
24%
683
10%
1720
March1st to 15thNight
20%
780
12%
2172
5%
780
26%
780
14%
1642
March16th to endNight
31%
832
20%
2288
10%
832
39%
832
23%
1537
April1st to 15thNight
24%
736
15%
1930
6%
736
29%
736
19%
1406
April16th to endNight
31%
579
16%
1735
8%
579
38%
579
21%
1189
May1st to 15thNight
35%
480
17%
1650
12%
480
45%
480
20%
1079
May16th to endNight
33%
406
13%
1617
10%
406
44%
406
20%
990
June1st to 15thNight
38%
390
11%
1365
10%
390
45%
390
22%
883
June16th to endNight
39%
390
9%
1365
7%
390
45%
390
21%
863
July1st to 15thNight
48%
370
15%
1295
16%
370
53%
370
30%
744
July16th to endNight
52%
456
14%
1504
13%
431
56%
431
27%
896
August1st to 15thNight
49%
575
13%
1715
10%
572
52%
572
25%
1146
August16th to endNight
48%
631
18%
1873
11%
631
53%
631
27%
1214
September1st to 15thNight
45%
780
19%
1973
10%
780
49%
780
33%
1290
September16th to endNight
43%
777
19%
2161
12%
777
47%
777
30%
1400
October1st to 15thNight
31%
780
15%
2340
10%
780
38%
780
19%
1668
October16th to endNight
20%
832
11%
2540
6%
832
28%
832
12%
1971
November1st to 15thNight
25%
820
13%
2852
10%
820
31%
820
15%
2030
November16th to endNight
19%
840
9%
2938
6%
840
24%
840
10%
2313
December1st to 15thNight
16%
813
8%
2763
3%
813
23%
813
8%
2221
December16th to endNight
17%
1040
9%
3120
4%
1040
22%
1040
8%
2586

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
18%10%46%5%34446%30%
52720
Night
18%10%47%6%34446%30%
51750
Cloud CoverDay
18%10%46%5%34446%30%
52730
Night
18%10%47%6%34446%30%
51755
TransparencyDay
54%311%19%8%
52399
Night
54%411%19%8%
51589
SeeingDay
24%11%29%21%9%3
7362
Night
24%10%28%25%9%
16627

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
21%17%6%8%5%25%33420%
1358
16th to endDay
16%18%6%10%5%44436%18%
1769
February1st to 15thDay
10%17%5%10%10%45%445%20%
1710
16th to endDay
17%17%6%8%6%3433423%
1558
March1st to 15thDay
17%13%47%6%25%345%29%
2106
16th to endDay
14%9%46%423346%40%
2288
April1st to 15thDay
22%11%36%424436%29%
2357
16th to endDay
22%8%25%323335%39%
2500
May1st to 15thDay
22%7%36%5%2445%6%33%
2630
16th to endDay
18%6%35%6%34447%36%
2848
June1st to 15thDay
17%7%37%6%35%5%5%7%30%
2925
16th to endDay
16%6%36%6%36%5%6%8%29%
2925
July1st to 15thDay
12%425%5%35%5%6%8%39%
2925
16th to endDay
13%5%25%6%46%6%6%8%34%
2915
August1st to 15thDay
16%5%345%45%5%6%8%33%
2487
16th to endDay
17%6%25%5%3445%7%35%
2668
September1st to 15thDay
17%7%36%5%3345%6%36%
2315
16th to endDay
22%6%25%5%2435%6%35%
2129
October1st to 15thDay
21%9%36%6%34445%31%
1950
16th to endDay
30%12%47%5%3344420%
2035
November1st to 15thDay
23%13%47%5%23436%25%
1665
16th to endDay
26%16%6%8%5%2333418%
1677
December1st to 15thDay
19%20%6%8%6%34345%17%
1524
16th to endDay
19%18%8%9%7%2333417%
1456
January1st to 15thNight
21%17%5%9%7%3333419%
2910
16th to endNight
16%14%8%8%7%34445%20%
2801
February1st to 15thNight
12%13%6%9%8%46%5%45%22%
2480
16th to endNight
16%16%6%9%7%34335%22%
2200
March1st to 15thNight
17%12%5%8%5%34435%28%
2160
16th to endNight
13%8%45%6%24436%40%
2288
April1st to 15thNight
20%10%46%5%23345%31%
1930
16th to endNight
20%8%25%5%33345%37%
1735
May1st to 15thNight
17%6%26%434447%36%
1650
16th to endNight
15%6%25%5%24446%41%
1615
June1st to 15thNight
14%7%35%5%245%48%36%
1365
16th to endNight
11%6%35%5%45%45%9%38%
1365
July1st to 15thNight
8%415%5%345%5%9%46%
1365
16th to endNight
9%425%43446%9%44%
1600
August1st to 15thNight
13%5%36%5%35%45%6%41%
1726
16th to endNight
13%6%244345%5%7%43%
1873
September1st to 15thNight
15%5%2442445%6%46%
1973
16th to endNight
16%5%25%42335%6%43%
2161
October1st to 15thNight
23%7%25%5%23446%33%
2340
16th to endNight
27%11%36%5%34345%23%
2540
November1st to 15thNight
20%9%47%5%34445%29%
2852
16th to endNight
26%13%46%6%34345%21%
2938
December1st to 15thNight
21%16%5%7%7%3444420%
2763
16th to endNight
21%16%7%9%6%3443417%
3120

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
20%17%7%7%6%2434420%
1358
16th to endDay
16%18%6%10%6%34346%19%
1769
February1st to 15thDay
10%17%5%11%10%45%45%5%20%
1710
16th to endDay
18%17%6%8%6%3443423%
1558
March1st to 15thDay
17%12%5%7%6%24345%29%
2117
16th to endDay
13%9%46%423346%39%
2287
April1st to 15thDay
22%11%36%424346%28%
2357
16th to endDay
22%8%35%323335%39%
2500
May1st to 15thDay
21%8%35%5%24447%32%
2630
16th to endDay
18%6%26%6%34447%36%
2848
June1st to 15thDay
18%7%47%6%345%47%30%
2925
16th to endDay
16%7%36%6%46%5%6%8%29%
2925
July1st to 15thDay
12%5%25%435%46%8%39%
2925
16th to endDay
13%5%25%6%36%6%6%8%34%
2915
August1st to 15thDay
15%6%246%35%5%6%8%32%
2487
16th to endDay
17%6%26%5%35%5%5%8%35%
2668
September1st to 15thDay
16%7%36%5%245%46%36%
2315
16th to endDay
22%6%25%5%24446%34%
2129
October1st to 15thDay
21%9%36%6%34445%31%
1950
16th to endDay
29%12%37%5%34335%20%
2035
November1st to 15thDay
23%13%36%5%24346%24%
1665
16th to endDay
26%17%6%7%6%2333418%
1677
December1st to 15thDay
20%20%5%8%6%33345%17%
1524
16th to endDay
20%17%8%10%7%23335%17%
1456
January1st to 15thNight
21%17%6%9%7%33335%19%
2910
16th to endNight
16%14%7%8%7%45%445%20%
2801
February1st to 15thNight
12%13%6%10%8%45%5%45%22%
2473
16th to endNight
17%16%5%9%7%34435%22%
2200
March1st to 15thNight
17%12%6%8%6%24435%28%
2172
16th to endNight
13%8%45%5%24346%40%
2288
April1st to 15thNight
20%10%46%5%23346%31%
1930
16th to endNight
20%8%25%5%33345%36%
1735
May1st to 15thNight
17%6%26%435%448%36%
1650
16th to endNight
15%6%35%5%24446%40%
1615
June1st to 15thNight
15%7%35%5%345%47%36%
1365
16th to endNight
11%6%25%6%36%5%5%9%38%
1365
July1st to 15thNight
8%425%425%45%9%45%
1365
16th to endNight
9%425%4245%6%9%44%
1600
August1st to 15thNight
13%5%36%5%3445%6%40%
1726
16th to endNight
12%7%244345%47%42%
1873
September1st to 15thNight
15%5%2431445%6%46%
1973
16th to endNight
16%5%3443335%6%43%
2161
October1st to 15thNight
23%7%25%424436%33%
2340
16th to endNight
27%10%36%5%34345%23%
2540
November1st to 15thNight
20%10%46%6%34446%28%
2852
16th to endNight
26%13%47%6%34335%21%
2938
December1st to 15thNight
21%17%48%7%3344419%
2763
16th to endNight
21%17%7%8%7%3434416%
3120

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%11%5%
1359
16th to endDay
67%37%15%6%
1769
February1st to 15thDay
65%311%13%5%
1712
16th to endDay
65%26%15%9%
1558
March1st to 15thDay
58%211%17%8%1
2117
16th to endDay
47%28%23%14%3
2288
April1st to 15thDay
56%39%18%11%1
2357
16th to endDay
49%28%23%14%2
2500
May1st to 15thDay
51%310%20%12%1
2630
16th to endDay
48%412%20%13%1
2852
June1st to 15thDay
52%411%20%11%
2925
16th to endDay
50%5%13%19%9%1
2925
July1st to 15thDay
38%414%29%11%
2766
16th to endDay
45%5%14%26%7%
2748
August1st to 15thDay
47%417%21%8%
2474
16th to endDay
46%415%26%6%
2668
September1st to 15thDay
47%414%23%9%1
2315
16th to endDay
49%415%24%5%
2129
October1st to 15thDay
55%312%19%8%
1950
16th to endDay
67%311%13%4
2035
November1st to 15thDay
60%314%13%7%
1665
16th to endDay
70%39%11%3
1677
December1st to 15thDay
69%49%14%3
1524
16th to endDay
71%27%13%4
1456
January1st to 15thNight
69%39%12%4
2910
16th to endNight
65%39%14%6%
2801
February1st to 15thNight
63%312%15%5%
2482
16th to endNight
66%27%16%7%
2200
March1st to 15thNight
58%411%15%9%1
2172
16th to endNight
45%39%23%15%3
2288
April1st to 15thNight
54%28%19%12%1
1930
16th to endNight
49%29%19%16%2
1735
May1st to 15thNight
47%38%24%13%2
1650
16th to endNight
43%413%22%14%2
1617
June1st to 15thNight
45%312%23%12%2
1365
16th to endNight
42%6%14%20%13%1
1365
July1st to 15thNight
32%6%14%28%14%3
1295
16th to endNight
37%5%17%28%10%
1504
August1st to 15thNight
43%6%16%23%10%
1715
16th to endNight
40%6%15%27%10%
1873
September1st to 15thNight
37%5%16%26%11%1
1973
16th to endNight
40%416%31%7%
2161
October1st to 15thNight
53%312%21%9%
2340
16th to endNight
63%312%14%5%
2540
November1st to 15thNight
55%315%19%6%
2852
16th to endNight
66%311%13%4
2938
December1st to 15thNight
67%410%12%4
2763
16th to endNight
71%37%11%6%
3120

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%13%42%14%11
90
16th to endDay
38%6%28%15%10%
136
February1st to 15thDay
28%17%42%10%
135
16th to endDay
40%19%29%10%
120
March1st to 15thDay
25%17%28%22%5%
302
16th to endDay
21%18%28%21%7%2
352
April1st to 15thDay
29%13%26%21%9%1
330
16th to endDay
31%13%25%17%7%4
319
May1st to 15thDay
31%8%27%18%10%3
348
16th to endDay
22%14%31%19%8%3
401
June1st to 15thDay
23%13%30%24%6%1
570
16th to endDay
19%11%30%25%10%2
570
July1st to 15thDay
13%8%34%28%12%2
550
16th to endDay
16%6%28%26%16%5%
476
August1st to 15thDay
18%6%20%29%15%9%
358
16th to endDay
23%5%24%21%15%9%
396
September1st to 15thDay
20%5%26%24%16%6%
375
16th to endDay
25%8%28%21%10%5%
374
October1st to 15thDay
27%12%29%19%8%1
375
16th to endDay
33%17%28%15%31
355
November1st to 15thDay
40%12%31%11%21
125
16th to endDay
37%11%34%12%2
119
December1st to 15thDay
38%13%32%12%3
90
16th to endDay
33%16%31%16%11
96
January1st to 15thNight
31%13%28%20%5%
975
16th to endNight
26%10%27%24%9%1
897
February1st to 15thNight
20%12%35%25%5%
764
16th to endNight
24%16%31%23%5%
683
March1st to 15thNight
25%16%30%22%3
780
16th to endNight
18%12%32%26%8%
832
April1st to 15thNight
27%13%30%22%5%
736
16th to endNight
25%11%26%24%10%1
579
May1st to 15thNight
21%8%27%31%10%
480
16th to endNight
18%9%33%28%9%
407
June1st to 15thNight
20%8%25%34%10%
390
16th to endNight
15%5%31%31%15%
390
July1st to 15thNight
11%429%39%14%
370
16th to endNight
10%326%39%19%
456
August1st to 15thNight
16%322%33%21%2
575
16th to endNight
18%423%31%19%2
631
September1st to 15thNight
19%5%25%27%20%2
780
16th to endNight
20%6%25%27%17%2
777
October1st to 15thNight
27%10%27%25%8%1
780
16th to endNight
35%9%27%20%6%
832
November1st to 15thNight
26%12%30%22%8%1
820
16th to endNight
37%10%24%20%6%
840
December1st to 15thNight
31%12%29%19%5%
813
16th to endNight
33%14%25%21%4
1040
Page generated at 2018-12-01 11:35:36. Version ac04

Copyright 2018 A. Danko


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