Paradise
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Paradise clear sky chart from 2005-11-05 to 2017-10-06.

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
62%
15217
28%
47097
23%
15177
68%
15177
38%
25625

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
55%
720
19%
2479
18%
716
60%
716
27%
1472
January16th to endNight
47%
768
26%
2496
21%
768
55%
768
27%
1540
February1st to 15thNight
49%
697
23%
2287
19%
696
57%
696
25%
1426
February16th to endNight
49%
632
24%
1907
19%
632
57%
632
26%
1229
March1st to 15thNight
47%
720
15%
2046
12%
720
52%
720
24%
1398
March16th to endNight
43%
768
20%
2067
12%
768
49%
768
28%
1371
April1st to 15thNight
46%
719
20%
1799
9%
719
51%
719
30%
1212
April16th to endNight
59%
720
25%
1800
12%
720
63%
720
43%
1058
May1st to 15thNight
59%
515
28%
1595
19%
515
66%
515
47%
781
May16th to endNight
65%
375
24%
1496
27%
374
70%
374
35%
712
June1st to 15thNight
68%
360
25%
1440
29%
360
75%
360
40%
644
June16th to endNight
81%
360
34%
1440
44%
360
87%
360
58%
511
July1st to 15thNight
93%
340
34%
1360
46%
340
95%
340
74%
423
July16th to endNight
92%
488
40%
1519
42%
457
94%
457
80%
524
August1st to 15thNight
91%
539
39%
1612
33%
536
92%
536
73%
654
August16th to endNight
92%
764
45%
1910
29%
764
93%
764
83%
855
September1st to 15thNight
89%
720
43%
1800
29%
720
92%
720
78%
820
September16th to endNight
81%
716
44%
1956
37%
716
85%
716
69%
867
October1st to 15thNight
68%
684
31%
2052
29%
684
74%
684
49%
1004
October16th to endNight
67%
704
33%
2112
32%
704
74%
704
45%
1101
November1st to 15thNight
62%
700
26%
2248
23%
700
68%
700
34%
1266
November16th to endNight
52%
720
23%
2468
22%
720
58%
720
28%
1429
December1st to 15thNight
48%
720
21%
2520
17%
720
56%
720
23%
1577
December16th to endNight
39%
768
21%
2688
16%
768
48%
768
20%
1751

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
11%312212335%62%
48104
Night
13%312212335%59%
47280
TransparencyDay
25%47%18%24%20%
47785
Night
28%47%17%23%18%
47099
SeeingDay
13%9%25%31%16%3
5923
Night
14%414%31%31%5%
15225

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 15thDay
20%414322246%46%
1456
16th to endDay
23%5%13212336%45%
1728
February1st to 15thDay
23%41321343446%
1576
16th to endDay
24%6%12213347%40%
1565
March1st to 15thDay
26%424423336%39%
1913
16th to endDay
23%5%2331235%7%41%
2156
April1st to 15thDay
20%425%313437%42%
2149
16th to endDay
11%312213346%57%
2160
May1st to 15thDay
6%312212347%64%
2352
16th to endDay
7%313323437%59%
2615
June1st to 15thDay
6%312313435%64%
2520
16th to endDay
311122382%
2520
July1st to 15thDay
111111286%
2520
16th to endDay
111288%
2542
August1st to 15thDay
111112286%
2337
16th to endDay
112388%
2292
September1st to 15thDay
111112483%
2160
16th to endDay
411111225%76%
2002
October1st to 15thDay
7%2221233467%
1705
16th to endDay
13%313313346%57%
1760
November1st to 15thDay
14%3342445%7%49%
1609
16th to endDay
20%42332233449%
1491
December1st to 15thDay
24%5%1232334443%
1440
16th to endDay
28%5%23223235%39%
1536
January1st to 15thNight
18%5%13213346%47%
2479
16th to endNight
22%5%1332232448%
2496
February1st to 15thNight
21%5%23313347%43%
2276
16th to endNight
23%413213346%44%
1907
March1st to 15thNight
24%5%1432435%7%37%
2046
16th to endNight
20%5%24313236%44%
2067
April1st to 15thNight
16%425%424447%43%
1799
16th to endNight
10%313322246%59%
1800
May1st to 15thNight
6%22212346%65%
1595
16th to endNight
6%31321345%6%60%
1496
June1st to 15thNight
5%212212346%66%
1440
16th to endNight
321222280%
1440
July1st to 15thNight
111212286%
1440
16th to endNight
1111288%
1624
August1st to 15thNight
11111122283%
1621
16th to endNight
1112385%
1910
September1st to 15thNight
111112385%
1800
16th to endNight
211123379%
1956
October1st to 15thNight
8%21221223468%
2052
16th to endNight
10%213212345%61%
2112
November1st to 15thNight
13%21221345%7%53%
2248
16th to endNight
17%313313346%50%
2468
December1st to 15thNight
25%312323336%44%
2520
16th to endNight
28%413312335%41%
2688

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
41%39%19%17%7%
1456
16th to endDay
42%36%15%18%13%
1728
February1st to 15thDay
41%410%17%21%5%
1576
16th to endDay
43%5%8%25%14%2
1565
March1st to 15thDay
47%5%9%17%14%6%
1913
16th to endDay
42%6%12%18%14%4
2156
April1st to 15thDay
41%5%11%20%17%3
2149
16th to endDay
27%5%11%24%22%7%
2160
May1st to 15thDay
20%38%27%29%10%
2352
16th to endDay
25%6%10%27%21%8%
2619
June1st to 15thDay
21%6%9%19%22%20%
2520
16th to endDay
8%2415%37%32%
2520
July1st to 15thDay
6%129%30%49%
2371
16th to endDay
5%1210%24%55%
2384
August1st to 15thDay
6%2212%32%43%
2321
16th to endDay
41212%35%43%
2292
September1st to 15thDay
7%1211%33%41%
2160
16th to endDay
12%25%22%32%23%
2002
October1st to 15thDay
19%45%20%28%20%
1705
16th to endDay
28%46%20%24%15%
1760
November1st to 15thDay
33%6%10%23%16%9%
1609
16th to endDay
39%47%19%19%9%
1491
December1st to 15thDay
44%47%15%21%6%
1440
16th to endDay
48%46%13%19%7%
1536
January1st to 15thNight
37%410%18%19%8%
2479
16th to endNight
41%36%14%18%16%
2496
February1st to 15thNight
41%47%18%18%9%
2288
16th to endNight
40%6%7%23%17%4
1907
March1st to 15thNight
45%5%10%14%16%7%
2046
16th to endNight
42%48%21%17%6%
2067
April1st to 15thNight
40%5%12%20%15%7%
1799
16th to endNight
26%5%10%22%26%8%
1800
May1st to 15thNight
19%410%21%30%12%
1596
16th to endNight
23%6%12%25%22%9%
1496
June1st to 15thNight
20%6%10%20%23%19%
1440
16th to endNight
11%2415%29%35%
1440
July1st to 15thNight
6%1211%24%53%
1360
16th to endNight
5%110%20%59%
1519
August1st to 15thNight
8%1212%31%42%
1612
16th to endNight
5%1313%30%46%
1910
September1st to 15thNight
7%1210%33%43%
1800
16th to endNight
9%25%17%37%27%
1956
October1st to 15thNight
20%35%19%28%22%
2052
16th to endNight
24%47%21%24%18%
2112
November1st to 15thNight
29%6%11%24%17%10%
2248
16th to endNight
34%5%6%22%20%10%
2468
December1st to 15thNight
42%5%7%15%21%7%
2520
16th to endNight
46%46%13%19%9%
2688

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
40%5%19%27%7%
84
16th to endDay
27%6%21%27%12%3
256
February1st to 15thDay
28%9%24%24%13%
236
16th to endDay
28%14%22%22%12%
235
March1st to 15thDay
31%16%21%16%11%1
270
16th to endDay
26%17%24%20%11%
288
April1st to 15thDay
26%15%26%21%8%2
269
16th to endDay
15%19%31%24%7%2
270
May1st to 15thDay
10%14%36%25%10%2
288
16th to endDay
10%10%21%29%20%6%
330
June1st to 15thDay
7%15%29%29%14%3
315
16th to endDay
26%27%40%16%5%
315
July1st to 15thDay
1221%49%17%6%
305
16th to endDay
124%47%20%5%
327
August1st to 15thDay
1225%41%22%6%
315
16th to endDay
1321%39%25%9%
332
September1st to 15thDay
1423%39%25%5%
315
16th to endDay
411%24%34%23%1
315
October1st to 15thDay
8%14%28%29%16%3
278
16th to endDay
18%6%26%30%17%1
272
November1st to 15thDay
21%313%25%27%7%
115
16th to endDay
18%8%33%28%8%1
69
December1st to 15thDay
45%5%30%18%1
60
16th to endDay
21%423%28%15%6%
64
January1st to 15thNight
19%315%42%15%2
720
16th to endNight
24%418%31%18%1
768
February1st to 15thNight
22%5%15%34%20%1
704
16th to endNight
25%6%15%31%18%3
632
March1st to 15thNight
25%6%12%28%21%4
720
16th to endNight
23%5%21%25%21%2
768
April1st to 15thNight
17%8%20%30%19%3
719
16th to endNight
11%6%17%33%25%5%
720
May1st to 15thNight
7%424%29%30%3
516
16th to endNight
7%5%16%25%38%6%
375
June1st to 15thNight
6%316%30%39%4
360
16th to endNight
4110%30%46%6%
360
July1st to 15thNight
1224%63%7%
340
16th to endNight
322%61%11%
488
August1st to 15thNight
2226%58%9%
539
16th to endNight
430%55%7%
764
September1st to 15thNight
115%27%53%10%
720
16th to endNight
3210%32%38%12%
716
October1st to 15thNight
8%5%13%30%33%8%
684
16th to endNight
12%311%32%33%6%
704
November1st to 15thNight
13%315%32%28%5%
700
16th to endNight
16%5%17%36%20%2
720
December1st to 15thNight
25%5%14%34%18%1
720
16th to endNight
28%5%20%31%13%1
768
Page generated at 2017-10-07 11:07:52. Version ac04

Copyright 2017 A. Danko


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