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 2017-09-21.

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%
15078
12%
46778
7%
15047
34%
15047
16%
33883

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
16%
897
6%
2685
3%
895
19%
895
8%
2219
January16th to endNight
24%
828
11%
2586
6%
828
29%
828
11%
2033
February1st to 15thNight
18%
702
9%
2287
3%
701
24%
701
10%
1765
February16th to endNight
17%
631
10%
2033
4%
631
24%
631
10%
1597
March1st to 15thNight
20%
720
12%
2005
5%
720
27%
720
15%
1512
March16th to endNight
32%
768
19%
2112
10%
768
39%
768
23%
1429
April1st to 15thNight
24%
679
15%
1781
6%
679
29%
679
20%
1293
April16th to endNight
30%
540
17%
1620
8%
540
38%
540
20%
1115
May1st to 15thNight
35%
443
16%
1523
12%
443
44%
443
20%
1010
May16th to endNight
32%
374
12%
1490
9%
374
42%
374
19%
924
June1st to 15thNight
37%
360
10%
1260
8%
360
43%
360
21%
826
June16th to endNight
38%
360
9%
1260
6%
360
43%
360
21%
807
July1st to 15thNight
47%
340
13%
1190
14%
340
51%
340
28%
702
July16th to endNight
51%
420
14%
1379
13%
395
55%
395
27%
822
August1st to 15thNight
49%
539
13%
1609
9%
536
52%
536
25%
1077
August16th to endNight
48%
582
19%
1728
12%
582
52%
582
28%
1114
September1st to 15thNight
44%
720
16%
1821
8%
720
47%
720
32%
1202
September16th to endNight
44%
681
19%
1895
12%
681
48%
681
30%
1224
October1st to 15thNight
32%
660
16%
1980
11%
660
39%
660
19%
1400
October16th to endNight
22%
704
11%
2149
6%
704
28%
704
13%
1667
November1st to 15thNight
26%
700
13%
2435
11%
700
32%
700
16%
1709
November16th to endNight
21%
720
10%
2520
6%
720
25%
720
10%
1959
December1st to 15thNight
16%
750
7%
2550
2%
750
22%
750
8%
2050
December16th to endNight
16%
960
7%
2880
3%
960
20%
960
7%
2427

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
19%10%46%5%34446%30%
48093
Night
18%10%46%6%34446%30%
46939
Cloud CoverDay
18%10%36%5%34446%29%
48103
Night
18%10%47%5%34446%30%
46944
TransparencyDay
54%312%19%8%
47772
Night
55%412%19%8%
46778
SeeingDay
24%10%28%21%10%3
5860
Night
25%10%28%25%9%1
15084

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%3433421%
1253
16th to endDay
15%18%6%11%5%44446%19%
1633
February1st to 15thDay
11%17%5%10%10%45%445%21%
1575
16th to endDay
16%17%6%8%6%3433424%
1440
March1st to 15thDay
18%12%47%6%25%345%30%
1943
16th to endDay
14%9%47%433346%38%
2112
April1st to 15thDay
23%10%35%424446%30%
2175
16th to endDay
21%8%25%323336%38%
2340
May1st to 15thDay
22%7%36%5%2445%6%31%
2427
16th to endDay
19%6%35%6%34446%35%
2624
June1st to 15thDay
18%7%37%6%35%5%5%7%29%
2700
16th to endDay
17%7%36%6%36%5%6%8%28%
2700
July1st to 15thDay
13%435%5%35%5%6%8%37%
2700
16th to endDay
14%5%25%6%35%6%6%8%34%
2688
August1st to 15thDay
17%5%345%45%5%6%8%32%
2340
16th to endDay
17%6%25%5%3445%7%35%
2462
September1st to 15thDay
17%7%35%5%345%5%6%35%
2137
16th to endDay
23%6%25%5%3445%6%34%
1858
October1st to 15thDay
20%9%46%6%3444431%
1650
16th to endDay
33%11%36%5%3344420%
1722
November1st to 15thDay
22%12%46%5%24436%27%
1423
16th to endDay
27%16%6%7%5%2333418%
1440
December1st to 15thDay
20%19%5%8%7%24345%17%
1407
16th to endDay
20%19%9%9%6%2343415%
1344
January1st to 15thNight
21%17%6%9%7%3333419%
2685
16th to endNight
16%14%8%8%7%35%445%20%
2586
February1st to 15thNight
13%13%6%10%8%46%445%21%
2285
16th to endNight
16%16%6%9%7%35%32423%
2033
March1st to 15thNight
18%11%5%8%5%34446%27%
1993
16th to endNight
13%8%45%6%24436%40%
2112
April1st to 15thNight
21%10%46%5%23346%32%
1781
16th to endNight
19%8%35%5%33345%36%
1620
May1st to 15thNight
18%6%26%434447%35%
1523
16th to endNight
16%6%25%5%34446%39%
1488
June1st to 15thNight
15%8%35%5%25%5%48%35%
1260
16th to endNight
12%6%35%5%46%45%9%37%
1260
July1st to 15thNight
9%5%15%5%345%5%9%43%
1260
16th to endNight
10%5%25%43446%9%43%
1475
August1st to 15thNight
13%5%36%5%35%45%6%41%
1620
16th to endNight
13%6%244345%5%7%43%
1728
September1st to 15thNight
15%5%2442445%6%45%
1821
16th to endNight
17%5%25%42325%6%44%
1895
October1st to 15thNight
23%7%35%423346%34%
1980
16th to endNight
28%10%36%5%34245%24%
2149
November1st to 15thNight
20%8%47%5%34446%30%
2435
16th to endNight
26%13%46%5%3334423%
2520
December1st to 15thNight
22%16%5%7%7%2443420%
2550
16th to endNight
23%17%7%9%7%3433416%
2880

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%6%7%5%2434421%
1253
16th to endDay
14%18%6%10%6%35%346%19%
1633
February1st to 15thDay
11%17%411%10%45%45%5%20%
1575
16th to endDay
16%17%6%8%6%3343424%
1440
March1st to 15thDay
18%11%46%6%25%345%29%
1954
16th to endDay
14%9%47%424346%38%
2111
April1st to 15thDay
23%10%35%424346%30%
2175
16th to endDay
22%8%35%323335%38%
2340
May1st to 15thDay
22%8%35%5%24447%30%
2427
16th to endDay
18%6%36%6%34446%35%
2624
June1st to 15thDay
18%7%37%6%35%6%5%7%28%
2700
16th to endDay
17%7%36%6%45%5%6%8%28%
2700
July1st to 15thDay
13%5%25%5%45%5%6%8%37%
2700
16th to endDay
13%5%25%6%35%6%6%8%34%
2688
August1st to 15thDay
15%7%246%35%5%6%8%32%
2340
16th to endDay
17%6%26%5%35%5%48%34%
2462
September1st to 15thDay
16%7%36%6%245%47%35%
2137
16th to endDay
22%6%35%5%24446%34%
1858
October1st to 15thDay
21%9%35%7%24445%31%
1650
16th to endDay
32%11%36%5%34335%20%
1722
November1st to 15thDay
22%12%36%5%24446%26%
1423
16th to endDay
27%17%6%7%5%2333418%
1440
December1st to 15thDay
21%19%48%7%34345%17%
1407
16th to endDay
21%18%8%9%6%2333415%
1344
January1st to 15thNight
21%17%6%10%7%3333418%
2685
16th to endNight
16%14%8%8%7%44445%20%
2586
February1st to 15thNight
13%13%6%10%8%45%5%45%21%
2278
16th to endNight
16%16%6%9%7%3432422%
2033
March1st to 15thNight
18%11%5%8%6%24435%28%
2005
16th to endNight
14%8%45%5%23346%40%
2112
April1st to 15thNight
21%10%45%5%23346%31%
1781
16th to endNight
19%8%36%5%33345%36%
1620
May1st to 15thNight
18%7%26%434448%35%
1523
16th to endNight
15%6%35%5%35%446%39%
1488
June1st to 15thNight
15%8%45%5%345%47%35%
1260
16th to endNight
12%6%25%6%36%5%5%9%37%
1260
July1st to 15thNight
9%5%25%5%35%45%10%43%
1260
16th to endNight
9%5%25%4245%6%9%43%
1475
August1st to 15thNight
13%5%35%5%3445%6%40%
1620
16th to endNight
12%7%244345%48%42%
1728
September1st to 15thNight
15%5%2441445%6%45%
1821
16th to endNight
16%5%2443335%6%44%
1895
October1st to 15thNight
23%7%35%424446%34%
1980
16th to endNight
28%9%36%6%34345%23%
2149
November1st to 15thNight
19%8%46%6%34446%30%
2435
16th to endNight
26%12%46%5%34335%23%
2520
December1st to 15thNight
22%17%48%6%33435%19%
2550
16th to endNight
22%17%7%9%7%3434415%
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%11%5%
1254
16th to endDay
66%38%15%6%
1633
February1st to 15thDay
65%312%14%4
1577
16th to endDay
64%26%15%10%
1440
March1st to 15thDay
57%212%18%8%
1954
16th to endDay
48%29%21%15%3
2112
April1st to 15thDay
54%310%19%11%1
2175
16th to endDay
49%28%23%13%2
2340
May1st to 15thDay
53%310%19%11%1
2427
16th to endDay
49%412%19%13%
2628
June1st to 15thDay
52%411%20%10%
2700
16th to endDay
51%5%13%20%8%1
2700
July1st to 15thDay
40%414%28%11%
2541
16th to endDay
46%5%13%25%8%
2521
August1st to 15thDay
47%417%21%8%
2327
16th to endDay
47%415%26%5%
2462
September1st to 15thDay
48%415%23%7%1
2137
16th to endDay
50%415%23%5%
1858
October1st to 15thDay
55%313%19%7%
1650
16th to endDay
67%312%12%3
1722
November1st to 15thDay
58%314%15%7%
1423
16th to endDay
70%310%11%4
1440
December1st to 15thDay
69%49%14%2
1407
16th to endDay
72%28%13%3
1344
January1st to 15thNight
70%39%11%3
2685
16th to endNight
65%39%15%6%
2586
February1st to 15thNight
64%312%14%5%
2287
16th to endNight
66%27%15%7%
2033
March1st to 15thNight
57%411%16%8%
2005
16th to endNight
46%39%22%15%3
2112
April1st to 15thNight
53%28%19%13%2
1781
16th to endNight
49%29%19%15%2
1620
May1st to 15thNight
48%38%24%13%2
1523
16th to endNight
44%413%21%13%2
1490
June1st to 15thNight
46%412%23%11%2
1260
16th to endNight
43%6%15%21%12%1
1260
July1st to 15thNight
34%7%14%27%13%2
1190
16th to endNight
37%5%17%27%10%
1379
August1st to 15thNight
43%6%15%23%10%
1609
16th to endNight
39%6%15%29%9%
1728
September1st to 15thNight
38%5%17%27%9%1
1821
16th to endNight
40%415%32%7%
1895
October1st to 15thNight
52%312%20%10%
1980
16th to endNight
62%313%13%6%
2149
November1st to 15thNight
54%315%19%6%
2435
16th to endNight
65%312%13%4
2520
December1st to 15thNight
68%411%13%3
2550
16th to endNight
73%27%10%5%
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
25%16%43%11%11
60
16th to endDay
35%5%27%18%12%1
91
February1st to 15thDay
32%14%42%10%1
90
16th to endDay
38%14%32%13%1
81
March1st to 15thDay
25%15%30%22%5%
244
16th to endDay
22%18%27%20%8%3
288
April1st to 15thDay
27%13%27%22%8%1
270
16th to endDay
30%14%26%15%7%5%
270
May1st to 15thDay
32%8%22%20%11%4
288
16th to endDay
23%13%31%18%8%3
337
June1st to 15thDay
24%13%27%26%6%1
495
16th to endDay
20%11%30%24%10%3
495
July1st to 15thDay
14%8%34%28%13%2
475
16th to endDay
16%6%29%25%16%5%
405
August1st to 15thDay
19%420%29%15%10%
313
16th to endDay
23%5%24%20%15%9%
332
September1st to 15thDay
21%426%23%17%6%
315
16th to endDay
25%6%27%22%12%5%
275
October1st to 15thDay
24%9%32%21%9%1
255
16th to endDay
34%15%26%16%41
234
November1st to 15thDay
30%11%33%17%43
63
16th to endDay
46%10%28%11%3
60
December1st to 15thDay
38%15%33%11%1
60
16th to endDay
43%20%29%6%
64
January1st to 15thNight
31%13%29%20%5%
900
16th to endNight
26%10%27%25%9%1
828
February1st to 15thNight
21%12%35%24%5%
704
16th to endNight
23%15%32%23%5%
631
March1st to 15thNight
26%16%30%22%3
720
16th to endNight
19%12%30%27%9%1
768
April1st to 15thNight
27%13%30%22%5%
679
16th to endNight
25%12%27%24%9%1
540
May1st to 15thNight
22%8%27%30%11%
443
16th to endNight
19%9%33%27%9%
375
June1st to 15thNight
21%8%26%33%10%
360
16th to endNight
16%431%31%14%
360
July1st to 15thNight
12%429%39%13%
340
16th to endNight
10%427%38%18%
420
August1st to 15thNight
17%323%31%21%2
539
16th to endNight
17%423%31%19%2
582
September1st to 15thNight
19%5%26%26%20%1
720
16th to endNight
21%5%24%28%17%2
681
October1st to 15thNight
27%10%26%25%9%
660
16th to endNight
35%8%26%21%6%
704
November1st to 15thNight
24%12%30%22%9%1
700
16th to endNight
37%9%23%21%7%
720
December1st to 15thNight
32%12%29%18%5%
750
16th to endNight
34%14%24%20%4
960
Page generated at 2017-09-22 07:35:35. Version ac04

Copyright 2017 A. Danko


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