Pauma Valley
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Pauma Valley clear sky chart from 2005-11-05 to 2017-12-04.

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
77%
16542
34%
47922
31%
16500
79%
16500
50%
24569

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
66%
717
31%
2327
30%
716
71%
716
41%
1206
January16th to endNight
63%
768
33%
2306
31%
768
68%
768
37%
1297
February1st to 15thNight
70%
698
34%
2109
35%
698
73%
698
44%
1110
February16th to endNight
59%
632
28%
1895
31%
632
61%
632
30%
1181
March1st to 15thNight
69%
720
30%
2160
33%
720
72%
720
42%
1159
March16th to endNight
73%
768
29%
2037
25%
768
75%
768
46%
1143
April1st to 15thNight
66%
719
27%
1799
19%
719
67%
719
42%
1087
April16th to endNight
72%
720
31%
1800
20%
720
74%
720
52%
1012
May1st to 15thNight
75%
578
31%
1658
23%
578
75%
578
46%
902
May16th to endNight
74%
561
29%
1685
24%
561
75%
561
44%
911
June1st to 15thNight
82%
540
32%
1620
28%
540
82%
540
56%
774
June16th to endNight
92%
540
38%
1620
35%
540
92%
540
79%
635
July1st to 15thNight
94%
510
31%
1530
26%
510
94%
510
65%
666
July16th to endNight
90%
622
33%
1647
25%
585
90%
585
59%
785
August1st to 15thNight
94%
717
38%
1790
24%
713
94%
713
76%
826
August16th to endNight
94%
764
44%
1910
31%
764
94%
764
76%
890
September1st to 15thNight
92%
720
39%
1872
33%
720
92%
720
68%
895
September16th to endNight
88%
716
48%
1980
45%
716
90%
716
72%
864
October1st to 15thNight
81%
720
37%
1980
36%
720
82%
720
57%
990
October16th to endNight
78%
768
40%
2304
41%
768
80%
768
50%
1128
November1st to 15thNight
77%
760
33%
2470
37%
760
79%
760
48%
1180
November16th to endNight
74%
780
36%
2535
39%
780
77%
780
43%
1285
December1st to 15thNight
69%
736
32%
2392
34%
736
71%
736
38%
1267
December16th to endNight
62%
768
32%
2496
31%
768
66%
768
35%
1376

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%312212336%66%
48562
Night
6%312213346%64%
48125
TransparencyDay
21%2416%27%28%
48263
Night
23%2415%24%30%
47926
SeeingDay
8%6%28%38%12%4
6183
Night
7%26%33%38%11%
16554

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%423323335%59%
1611
16th to endDay
11%5%13223345%54%
1917
February1st to 15thDay
9%412323346%57%
1751
16th to endDay
15%6%25%32335%6%45%
1579
March1st to 15thDay
8%31332435%8%57%
1800
16th to endDay
6%413323347%58%
2182
April1st to 15thDay
8%423323446%55%
2149
16th to endDay
5%43212246%66%
2160
May1st to 15thDay
6%312213246%63%
2292
16th to endDay
4312212345%67%
2429
June1st to 15thDay
321221222473%
2340
16th to endDay
111112386%
2340
July1st to 15thDay
112212347%70%
2340
16th to endDay
211221345%7%67%
2405
August1st to 15thDay
111111225%79%
2160
16th to endDay
11121223477%
2292
September1st to 15thDay
11212235%78%
2088
16th to endDay
11111122380%
1980
October1st to 15thDay
5%321312335%67%
1980
16th to endDay
6%31321233469%
1916
November1st to 15thDay
6%312323245%63%
1719
16th to endDay
7%313213247%60%
1755
December1st to 15thDay
9%5%1232435%8%53%
1649
16th to endDay
14%5%14323235%53%
1728
January1st to 15thNight
8%41331334459%
2327
16th to endNight
10%6%13322345%55%
2306
February1st to 15thNight
9%423313345%59%
2101
16th to endNight
13%7%2442333447%
1895
March1st to 15thNight
9%5%12213447%56%
2160
16th to endNight
7%42331445%9%54%
2037
April1st to 15thNight
8%6%33313437%53%
1799
16th to endNight
6%412313336%63%
1800
May1st to 15thNight
4413324347%60%
1658
16th to endNight
36%24212247%61%
1684
June1st to 15thNight
131331225%6%69%
1620
16th to endNight
114385%
1620
July1st to 15thNight
111222346%74%
1620
16th to endNight
2111113349%67%
1759
August1st to 15thNight
11112246%78%
1800
16th to endNight
11112225%81%
1910
September1st to 15thNight
112112235%77%
1872
16th to endNight
1112121481%
1980
October1st to 15thNight
5%212213236%68%
1980
16th to endNight
5%31321224467%
2304
November1st to 15thNight
3413323335%65%
2470
16th to endNight
6%5%13323347%59%
2535
December1st to 15thNight
9%41341335%7%53%
2392
16th to endNight
13%5%14313335%55%
2496

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
28%1412%27%24%
1612
16th to endDay
31%25%13%17%28%
1917
February1st to 15thDay
29%2314%24%25%
1751
16th to endDay
39%2416%22%13%
1579
March1st to 15thDay
25%25%20%25%20%
1800
16th to endDay
25%29%23%23%15%
2182
April1st to 15thDay
29%25%24%26%10%
2149
16th to endDay
20%17%23%28%17%
2160
May1st to 15thDay
23%25%20%29%19%
2292
16th to endDay
20%2423%34%13%
2432
June1st to 15thDay
18%1217%32%27%
2340
16th to endDay
7%115%23%60%
2340
July1st to 15thDay
13%2311%25%42%
2201
16th to endDay
15%38%22%27%22%
2255
August1st to 15thDay
10%1114%33%38%
2146
16th to endDay
10%2210%34%38%
2292
September1st to 15thDay
11%229%36%38%
2088
16th to endDay
10%29%37%40%
1980
October1st to 15thDay
20%2216%27%29%
1980
16th to endDay
20%2211%21%42%
1916
November1st to 15thDay
23%25%14%21%32%
1719
16th to endDay
24%2313%23%33%
1755
December1st to 15thDay
29%27%16%16%26%
1649
16th to endDay
34%26%15%24%17%
1728
January1st to 15thNight
28%2412%22%30%
2327
16th to endNight
32%16%11%17%30%
2306
February1st to 15thNight
27%15%15%20%28%
2112
16th to endNight
41%2313%21%17%
1895
March1st to 15thNight
28%26%19%21%23%
2160
16th to endNight
27%29%18%24%17%
2037
April1st to 15thNight
31%26%23%22%13%
1799
16th to endNight
24%16%22%23%21%
1800
May1st to 15thNight
26%26%19%23%21%
1659
16th to endNight
26%35%22%27%14%
1685
June1st to 15thNight
18%2414%32%27%
1620
16th to endNight
6%126%23%59%
1620
July1st to 15thNight
12%2310%27%44%
1530
16th to endNight
15%37%21%30%21%
1647
August1st to 15thNight
8%2215%36%35%
1790
16th to endNight
8%2210%32%43%
1910
September1st to 15thNight
11%3310%30%40%
1872
16th to endNight
10%110%35%41%
1980
October1st to 15thNight
19%2317%29%28%
1980
16th to endNight
21%2211%19%43%
2304
November1st to 15thNight
22%2415%20%34%
2470
16th to endNight
26%2313%20%34%
2535
December1st to 15thNight
29%26%14%20%25%
2392
16th to endNight
32%27%13%22%21%
2496

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
30%22%38%8%
90
16th to endDay
17%10%31%28%10%1
285
February1st to 15thDay
11%9%31%33%12%1
266
16th to endDay
20%10%37%24%5%
238
March1st to 15thDay
12%12%34%24%15%1
270
16th to endDay
6%16%37%26%10%2
288
April1st to 15thDay
13%14%37%23%7%2
269
16th to endDay
10%15%41%24%7%2
270
May1st to 15thDay
13%11%31%32%7%2
288
16th to endDay
12%10%35%30%10%1
330
June1st to 15thDay
3434%40%12%3
315
16th to endDay
2125%47%16%7%
315
July1st to 15thDay
3116%53%16%7%
305
16th to endDay
419%58%17%9%
327
August1st to 15thDay
1120%57%10%7%
315
16th to endDay
1114%57%14%9%
332
September1st to 15thDay
2227%51%11%4
315
16th to endDay
46%33%41%10%3
315
October1st to 15thDay
6%7%39%32%13%1
315
16th to endDay
11%431%28%18%5%
269
November1st to 15thDay
13%219%28%28%8%
135
16th to endDay
12%319%35%23%5%
135
December1st to 15thDay
7%323%38%27%2
100
16th to endDay
20%6%27%32%13%
96
January1st to 15thNight
9%114%41%25%7%
720
16th to endNight
14%210%37%27%7%
768
February1st to 15thNight
10%38%38%30%9%
704
16th to endNight
17%310%38%24%6%
632
March1st to 15thNight
10%47%40%31%5%
720
16th to endNight
8%28%36%32%10%
768
April1st to 15thNight
10%5%10%38%29%5%
719
16th to endNight
8%310%35%33%7%
720
May1st to 15thNight
7%29%37%34%8%
579
16th to endNight
6%310%33%38%7%
563
June1st to 15thNight
228%39%41%6%
540
16th to endNight
1334%53%7%
540
July1st to 15thNight
121%62%12%
510
16th to endNight
216%61%18%
622
August1st to 15thNight
118%61%18%
717
16th to endNight
110%60%27%
764
September1st to 15thNight
121%56%19%
720
16th to endNight
2431%46%15%
716
October1st to 15thNight
5%15%38%37%11%
720
16th to endNight
7%5%30%36%19%
768
November1st to 15thNight
6%16%38%34%13%
760
16th to endNight
7%28%35%32%13%
780
December1st to 15thNight
11%28%39%29%7%
736
16th to endNight
15%211%39%25%6%
768
Page generated at 2017-12-05 07:19:02. Version ac04

Copyright 2017 A. Danko


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