Pardee Reservoir Recreation Area
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Pardee Reservoir Recreation Area clear sky chart from 2005-11-05 to 2017-09-17.

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%
15281
29%
46880
28%
15246
75%
15246
44%
24405

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
65%
716
19%
2467
20%
716
67%
716
30%
1415
January16th to endNight
64%
768
25%
2496
27%
768
65%
768
29%
1506
February1st to 15thNight
61%
697
24%
2251
26%
697
64%
697
29%
1353
February16th to endNight
60%
632
26%
1895
26%
632
63%
632
31%
1163
March1st to 15thNight
58%
720
18%
2070
18%
720
59%
720
29%
1323
March16th to endNight
59%
768
21%
2049
17%
768
61%
768
32%
1316
April1st to 15thNight
62%
719
22%
1799
13%
719
64%
719
35%
1159
April16th to endNight
70%
720
25%
1800
15%
720
72%
720
48%
1032
May1st to 15thNight
77%
596
30%
1676
23%
596
79%
596
60%
794
May16th to endNight
80%
374
28%
1496
32%
374
83%
374
49%
607
June1st to 15thNight
82%
360
29%
1440
37%
360
85%
360
53%
550
June16th to endNight
89%
360
38%
1440
51%
360
90%
360
71%
452
July1st to 15thNight
95%
340
35%
1360
48%
340
95%
340
75%
418
July16th to endNight
91%
499
39%
1529
39%
467
92%
467
71%
585
August1st to 15thNight
91%
592
39%
1665
30%
589
91%
589
77%
689
August16th to endNight
94%
764
45%
1910
30%
764
94%
764
82%
852
September1st to 15thNight
93%
720
44%
1800
32%
720
94%
720
83%
797
September16th to endNight
89%
664
45%
1793
40%
664
91%
664
73%
794
October1st to 15thNight
77%
660
31%
1980
34%
660
80%
660
52%
973
October16th to endNight
78%
704
36%
2112
39%
704
81%
704
52%
1030
November1st to 15thNight
76%
700
30%
2253
33%
700
78%
700
44%
1132
November16th to endNight
68%
720
26%
2391
28%
720
70%
720
36%
1287
December1st to 15thNight
62%
720
21%
2520
22%
720
65%
720
27%
1503
December16th to endNight
53%
768
22%
2688
22%
768
57%
768
23%
1675

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
8%312212335%64%
47894
Night
10%312212335%61%
47066
TransparencyDay
23%27%20%24%21%
47576
Night
25%28%20%23%18%
46883
SeeingDay
10%420%33%23%6%
5876
Night
11%16%36%34%8%
15294

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
18%413312446%48%
1468
16th to endDay
19%5%24434335%42%
1728
February1st to 15thDay
19%5%1432344445%
1609
16th to endDay
20%6%24424336%40%
1579
March1st to 15thDay
17%5%2442447%7%40%
1887
16th to endDay
15%5%14424447%44%
2175
April1st to 15thDay
16%5%23424346%46%
2149
16th to endDay
10%312213346%60%
2160
May1st to 15thDay
422212335%70%
2271
16th to endDay
5%313223445%63%
2615
June1st to 15thDay
4212212235%70%
2520
16th to endDay
111112384%
2520
July1st to 15thDay
1112386%
2520
16th to endDay
1111112384%
2531
August1st to 15thDay
11211286%
2283
16th to endDay
11111386%
2292
September1st to 15thDay
11212385%
2160
16th to endDay
22121122477%
1869
October1st to 15thDay
421212346%69%
1650
16th to endDay
7%21242334463%
1760
November1st to 15thDay
9%31222435%8%56%
1606
16th to endDay
13%423423346%51%
1566
December1st to 15thDay
19%5%15%5%2423445%
1440
16th to endDay
22%5%23323346%41%
1536
January1st to 15thNight
15%323323447%48%
2467
16th to endNight
17%424324346%46%
2496
February1st to 15thNight
17%5%24323347%45%
2242
16th to endNight
20%423313445%48%
1895
March1st to 15thNight
19%433323346%44%
2070
16th to endNight
16%5%24423336%47%
2049
April1st to 15thNight
13%424435%446%47%
1799
16th to endNight
8%313213246%61%
1800
May1st to 15thNight
5%212111346%70%
1676
16th to endNight
5%212212336%68%
1496
June1st to 15thNight
31121223474%
1440
16th to endNight
111112285%
1440
July1st to 15thNight
1122285%
1440
16th to endNight
1111122283%
1635
August1st to 15thNight
111122383%
1674
16th to endNight
1112484%
1910
September1st to 15thNight
1112386%
1800
16th to endNight
2111222479%
1793
October1st to 15thNight
6%2231233468%
1980
16th to endNight
5%22312335%66%
2112
November1st to 15thNight
10%311212346%61%
2253
16th to endNight
12%313323436%55%
2391
December1st to 15thNight
18%324423346%46%
2520
16th to endNight
22%5%24322335%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
36%412%21%17%7%
1468
16th to endDay
44%38%17%15%9%
1728
February1st to 15thDay
40%310%23%16%5%
1609
16th to endDay
45%210%26%13%1
1579
March1st to 15thDay
41%412%20%16%4
1887
16th to endDay
39%416%20%16%2
2175
April1st to 15thDay
38%311%25%15%5%
2149
16th to endDay
24%312%27%25%6%
2160
May1st to 15thDay
17%18%28%33%9%
2271
16th to endDay
22%210%29%26%8%
2619
June1st to 15thDay
18%28%24%24%21%
2520
16th to endDay
7%1214%33%40%
2520
July1st to 15thDay
6%118%24%58%
2371
16th to endDay
8%128%23%54%
2374
August1st to 15thDay
7%119%28%51%
2267
16th to endDay
6%1110%35%44%
2292
September1st to 15thDay
6%1212%34%42%
2160
16th to endDay
11%2221%35%26%
1869
October1st to 15thDay
16%26%25%27%20%
1650
16th to endDay
23%26%24%27%15%
1760
November1st to 15thDay
26%213%30%20%6%
1606
16th to endDay
34%39%25%23%3
1566
December1st to 15thDay
43%211%20%18%3
1440
16th to endDay
44%312%18%17%4
1536
January1st to 15thNight
35%413%20%17%8%
2467
16th to endNight
39%39%17%16%14%
2496
February1st to 15thNight
38%39%23%17%7%
2253
16th to endNight
38%39%27%16%4
1895
March1st to 15thNight
40%311%19%18%5%
2070
16th to endNight
38%311%20%19%6%
2049
April1st to 15thNight
36%413%24%15%5%
1799
16th to endNight
24%413%24%24%8%
1800
May1st to 15thNight
16%210%26%30%13%
1677
16th to endNight
17%213%33%22%10%
1496
June1st to 15thNight
14%310%26%24%21%
1440
16th to endNight
7%1214%34%39%
1440
July1st to 15thNight
5%118%25%56%
1360
16th to endNight
9%127%24%54%
1529
August1st to 15thNight
7%114%27%48%
1665
16th to endNight
6%1111%33%45%
1910
September1st to 15thNight
5%1311%36%40%
1800
16th to endNight
9%1221%36%27%
1793
October1st to 15thNight
20%26%23%26%20%
1980
16th to endNight
20%26%24%26%18%
2112
November1st to 15thNight
24%311%25%22%11%
2253
16th to endNight
30%38%25%24%7%
2391
December1st to 15thNight
39%311%19%17%7%
2520
16th to endNight
43%310%18%15%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
31%7%12%25%20%3
96
16th to endDay
21%319%23%23%7%
256
February1st to 15thDay
21%6%16%26%21%6%
243
16th to endDay
23%7%21%24%19%2
238
March1st to 15thDay
22%6%24%22%19%4
270
16th to endDay
20%7%23%27%16%4
288
April1st to 15thDay
20%9%28%21%17%2
269
16th to endDay
12%10%28%28%13%6%
270
May1st to 15thDay
7%7%30%30%19%4
288
16th to endDay
9%8%17%30%26%7%
330
June1st to 15thDay
6%6%28%35%17%3
315
16th to endDay
1220%41%26%7%
315
July1st to 15thDay
113%46%30%7%
305
16th to endDay
118%44%27%9%
327
August1st to 15thDay
321%40%26%6%
315
16th to endDay
115%43%28%10%
332
September1st to 15thDay
116%47%27%6%
315
16th to endDay
35%18%36%29%6%
260
October1st to 15thDay
6%6%21%36%25%4
255
16th to endDay
9%5%21%30%27%5%
272
November1st to 15thDay
10%18%23%43%12%
112
16th to endDay
13%313%44%23%1
81
December1st to 15thDay
30%321%28%16%
60
16th to endDay
17%15%28%29%9%
64
January1st to 15thNight
16%27%34%28%11%
720
16th to endNight
20%25%32%27%12%
768
February1st to 15thNight
18%37%34%26%8%
704
16th to endNight
22%38%37%22%6%
632
March1st to 15thNight
20%27%33%28%7%
720
16th to endNight
18%39%35%27%5%
768
April1st to 15thNight
15%310%39%27%3
719
16th to endNight
10%210%38%31%7%
720
May1st to 15thNight
6%110%42%33%6%
597
16th to endNight
5%26%34%46%4
375
June1st to 15thNight
36%44%40%4
360
16th to endNight
1342%47%4
360
July1st to 15thNight
35%59%3
340
16th to endNight
1228%56%10%
499
August1st to 15thNight
1337%50%7%
592
16th to endNight
1239%48%8%
764
September1st to 15thNight
1133%52%10%
720
16th to endNight
2434%43%13%
664
October1st to 15thNight
7%26%38%33%11%
660
16th to endNight
8%16%34%33%16%
704
November1st to 15thNight
11%1439%30%12%
700
16th to endNight
12%18%38%27%11%
720
December1st to 15thNight
19%26%37%25%7%
720
16th to endNight
24%39%34%21%6%
768
Page generated at 2017-09-18 05:38:20. Version ac04

Copyright 2017 A. Danko


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