Panoche Pass
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Panoche Pass clear sky chart from 2005-11-05 to

2017-09-12
.

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
73%
15468
30%
46853
28%
15431
76%
15431
48%
23419

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
67%
716
21%
2404
23%
716
69%
716
34%
1325
January16th to endNight
64%
768
25%
2496
28%
768
66%
768
31%
1459
February1st to 15thNight
60%
700
25%
2232
26%
700
64%
700
33%
1276
February16th to endNight
60%
632
24%
1895
23%
632
64%
632
33%
1123
March1st to 15thNight
63%
720
20%
2052
19%
720
65%
720
33%
1241
March16th to endNight
61%
768
23%
2058
17%
768
65%
768
38%
1219
April1st to 15thNight
55%
719
24%
1799
14%
719
59%
719
41%
1080
April16th to endNight
64%
720
27%
1800
13%
720
69%
720
55%
946
May1st to 15thNight
70%
695
29%
1775
18%
695
73%
695
62%
883
May16th to endNight
74%
375
33%
1496
33%
374
82%
374
58%
532
June1st to 15thNight
77%
360
31%
1440
34%
360
84%
360
54%
541
June16th to endNight
91%
360
41%
1440
50%
360
95%
360
84%
405
July1st to 15thNight
95%
354
36%
1374
44%
354
96%
354
77%
425
July16th to endNight
94%
564
39%
1593
35%
531
94%
531
75%
640
August1st to 15thNight
93%
619
40%
1692
30%
616
93%
616
84%
690
August16th to endNight
93%
764
46%
1910
30%
764
94%
764
87%
825
September1st to 15thNight
91%
706
44%
1765
32%
706
93%
706
79%
805
September16th to endNight
86%
656
46%
1772
42%
656
88%
656
79%
754
October1st to 15thNight
77%
660
32%
1980
34%
660
80%
660
49%
971
October16th to endNight
78%
704
39%
2112
41%
704
82%
704
57%
966
November1st to 15thNight
75%
700
32%
2214
34%
700
78%
700
48%
1066
November16th to endNight
70%
720
28%
2346
29%
720
74%
720
40%
1202
December1st to 15thNight
62%
720
23%
2520
24%
720
66%
720
27%
1477
December16th to endNight
54%
768
23%
2688
22%
768
60%
768
26%
1568

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
5%313313345%64%
47809
Night
4313323346%62%
47040
TransparencyDay
21%38%18%26%22%
47494
Night
21%410%18%25%21%
46854
SeeingDay
7%8%19%33%23%7%
5968
Night
5%311%31%35%12%
15477

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
8%6%35%425%347%47%
1531
16th to endDay
12%7%26%42434445%
1728
February1st to 15thDay
12%8%34423446%46%
1631
16th to endDay
11%8%47%5%25%5%46%38%
1579
March1st to 15thDay
8%7%25%6%345%6%9%40%
1907
16th to endDay
9%6%25%5%25%45%7%44%
2166
April1st to 15thDay
9%7%35%32435%6%47%
2149
16th to endDay
6%312323346%60%
2160
May1st to 15thDay
2212313348%66%
2171
16th to endDay
422312347%66%
2615
June1st to 15thDay
2112212346%72%
2520
16th to endDay
1111387%
2520
July1st to 15thDay
112387%
2502
16th to endDay
1111112383%
2468
August1st to 15thDay
11112287%
2259
16th to endDay
112388%
2292
September1st to 15thDay
11122485%
2114
16th to endDay
111111335%78%
1856
October1st to 15thDay
421222345%6%64%
1650
16th to endDay
322224346%66%
1760
November1st to 15thDay
7%324434246%57%
1644
16th to endDay
6%5%2342445%7%52%
1611
December1st to 15thDay
10%7%46%5%3445%5%41%
1440
16th to endDay
11%8%35%5%3445%7%40%
1536
January1st to 15thNight
7%6%25%42445%7%48%
2404
16th to endNight
10%6%25%42445%7%46%
2496
February1st to 15thNight
9%5%35%4245%48%45%
2221
16th to endNight
6%6%36%43445%7%45%
1895
March1st to 15thNight
8%4246%35%5%6%8%45%
2052
16th to endNight
5%424435%5%6%7%48%
2058
April1st to 15thNight
6%5%24435%5%5%7%49%
1799
16th to endNight
3122324448%63%
1800
May1st to 15thNight
1212322338%68%
1775
16th to endNight
22212235%7%70%
1496
June1st to 15thNight
121213346%71%
1440
16th to endNight
11389%
1440
July1st to 15thNight
1112486%
1455
16th to endNight
1111123383%
1701
August1st to 15thNight
112287%
1701
16th to endNight
1112288%
1910
September1st to 15thNight
111122384%
1765
16th to endNight
11213480%
1772
October1st to 15thNight
4212324446%63%
1980
16th to endNight
3112213346%67%
2112
November1st to 15thNight
4313323338%61%
2214
16th to endNight
5%41323446%8%53%
2346
December1st to 15thNight
7%7%35%5%35%5%5%6%45%
2520
16th to endNight
12%5%25%5%24448%43%
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
33%5%9%21%19%10%
1531
16th to endDay
39%48%14%20%12%
1728
February1st to 15thDay
37%48%20%20%7%
1631
16th to endDay
42%5%10%21%16%2
1579
March1st to 15thDay
34%6%13%19%18%6%
1907
16th to endDay
35%6%14%21%17%4
2166
April1st to 15thDay
35%411%23%19%5%
2149
16th to endDay
23%410%26%27%6%
2160
May1st to 15thDay
15%47%26%36%9%
2171
16th to endDay
16%412%26%31%9%
2619
June1st to 15thDay
13%39%20%28%24%
2520
16th to endDay
5%1212%31%47%
2520
July1st to 15thDay
5%125%22%62%
2354
16th to endDay
7%138%23%55%
2313
August1st to 15thDay
5%210%28%52%
2243
16th to endDay
4110%38%44%
2292
September1st to 15thDay
6%1312%33%42%
2114
16th to endDay
8%1421%38%24%
1856
October1st to 15thDay
18%37%23%27%19%
1650
16th to endDay
17%38%22%28%19%
1760
November1st to 15thDay
27%311%18%27%10%
1644
16th to endDay
29%410%20%27%7%
1611
December1st to 15thDay
40%5%9%14%20%8%
1440
16th to endDay
41%5%12%17%17%5%
1536
January1st to 15thNight
31%412%22%21%8%
2404
16th to endNight
35%412%13%20%14%
2496
February1st to 15thNight
32%412%20%21%8%
2232
16th to endNight
32%6%14%25%17%4
1895
March1st to 15thNight
33%6%14%19%17%9%
2052
16th to endNight
28%6%16%22%19%6%
2058
April1st to 15thNight
28%5%17%25%19%4
1799
16th to endNight
16%5%17%26%26%8%
1800
May1st to 15thNight
13%49%24%33%15%
1776
16th to endNight
10%313%26%35%10%
1496
June1st to 15thNight
12%310%17%26%28%
1440
16th to endNight
3312%29%50%
1440
July1st to 15thNight
4126%18%65%
1374
16th to endNight
7%246%20%58%
1593
August1st to 15thNight
5%28%28%54%
1692
16th to endNight
427%32%51%
1910
September1st to 15thNight
6%239%26%51%
1765
16th to endNight
7%1419%38%29%
1772
October1st to 15thNight
18%5%6%21%26%20%
1980
16th to endNight
15%38%20%30%20%
2112
November1st to 15thNight
21%313%19%30%12%
2214
16th to endNight
25%411%19%28%10%
2346
December1st to 15thNight
35%6%10%16%21%9%
2520
16th to endNight
36%5%13%19%17%7%
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
16%8%26%30%13%3
159
16th to endDay
14%10%22%32%18%3
256
February1st to 15thDay
16%9%21%22%24%5%
246
16th to endDay
17%13%23%30%13%1
238
March1st to 15thDay
15%14%24%25%15%4
270
16th to endDay
14%13%30%29%10%1
288
April1st to 15thDay
16%20%28%20%12%1
269
16th to endDay
8%20%30%32%5%2
270
May1st to 15thDay
7%12%28%36%11%3
288
16th to endDay
6%10%23%35%16%7%
330
June1st to 15thDay
47%29%35%15%6%
315
16th to endDay
1217%42%25%9%
315
July1st to 15thDay
110%40%33%14%
305
16th to endDay
10%41%33%13%
327
August1st to 15thDay
112%42%32%10%
315
16th to endDay
5%34%41%18%
332
September1st to 15thDay
117%34%38%16%
300
16th to endDay
2313%26%39%13%
255
October1st to 15thDay
46%17%38%26%6%
255
16th to endDay
46%22%35%25%5%
272
November1st to 15thDay
8%6%12%20%38%14%
150
16th to endDay
7%13%17%35%21%3
89
December1st to 15thDay
11%8%31%33%15%
60
16th to endDay
417%10%37%20%9%
64
January1st to 15thNight
9%310%31%29%14%
720
16th to endNight
10%311%33%28%11%
768
February1st to 15thNight
11%414%29%28%11%
704
16th to endNight
9%7%15%35%23%8%
632
March1st to 15thNight
8%6%11%35%29%8%
720
16th to endNight
8%6%16%32%29%6%
768
April1st to 15thNight
7%8%20%34%23%5%
719
16th to endNight
36%21%29%29%9%
720
May1st to 15thNight
1318%37%29%9%
696
16th to endNight
2414%35%36%6%
375
June1st to 15thNight
1215%41%32%6%
360
16th to endNight
16%41%41%9%
360
July1st to 15thNight
1130%54%12%
354
16th to endNight
1119%53%24%
564
August1st to 15thNight
328%52%15%
619
16th to endNight
320%61%13%
764
September1st to 15thNight
1324%53%16%
706
16th to endNight
17%25%44%19%
656
October1st to 15thNight
5%37%32%33%17%
660
16th to endNight
4110%27%33%21%
704
November1st to 15thNight
5%210%33%33%15%
700
16th to endNight
6%412%30%32%14%
720
December1st to 15thNight
9%412%37%26%9%
720
16th to endNight
13%6%17%30%25%6%
768
Page generated at 2017-09-13 04:39:05. Version ac04

Copyright 2017 A. Danko


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