Pine Dale
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Pine Dale clear sky chart from 2005-11-05 to 2019-06-10.

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
51%
17493
23%
53631
18%
17450
57%
17450
29%
33194

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
28%
840
24%
2717
14%
836
41%
836
23%
1770
January16th to endNight
30%
896
25%
2741
13%
896
41%
896
24%
1786
February1st to 15thNight
29%
824
20%
2472
10%
821
37%
821
24%
1651
February16th to endNight
28%
735
20%
2205
10%
735
35%
735
21%
1517
March1st to 15thNight
32%
840
19%
2519
11%
840
38%
840
24%
1685
March16th to endNight
40%
813
20%
2381
13%
813
46%
813
29%
1512
April1st to 15thNight
46%
629
25%
2097
19%
629
56%
629
31%
1208
April16th to endNight
54%
624
25%
2076
20%
624
62%
624
33%
1152
May1st to 15thNight
56%
630
24%
1890
18%
630
62%
630
32%
1161
May16th to endNight
70%
657
20%
1971
18%
657
72%
657
34%
1176
June1st to 15thNight
74%
612
21%
1836
17%
612
75%
612
34%
1093
June16th to endNight
80%
585
21%
1584
17%
585
80%
585
40%
936
July1st to 15thNight
74%
555
16%
1528
15%
555
74%
555
31%
1002
July16th to endNight
78%
612
17%
1739
17%
579
79%
579
35%
1039
August1st to 15thNight
77%
575
18%
1897
20%
572
78%
572
31%
1108
August16th to endNight
74%
621
20%
2070
24%
621
74%
621
28%
1256
September1st to 15thNight
68%
660
20%
2025
20%
660
69%
660
29%
1278
September16th to endNight
68%
777
29%
2145
25%
777
69%
777
36%
1291
October1st to 15thNight
63%
780
35%
2145
29%
780
66%
780
40%
1247
October16th to endNight
55%
832
32%
2555
28%
832
62%
832
36%
1451
November1st to 15thNight
52%
820
28%
2666
26%
820
59%
820
32%
1539
November16th to endNight
45%
840
28%
2730
21%
840
55%
840
31%
1589
December1st to 15thNight
35%
840
23%
2730
15%
840
46%
840
24%
1745
December16th to endNight
31%
896
19%
2912
14%
896
38%
896
19%
2002

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
14%5%25%5%35%45%7%40%
54867
Night
13%5%2442445%7%45%
53823
TransparencyDay
41%6%11%20%16%3
54562
Night
37%5%10%21%19%5%
53632
SeeingDay
15%417%23%23%16%
7636
Night
14%421%31%23%4
17495

By Month

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
21%7%34423345%38%
1881
16th to endDay
19%5%24323345%44%
2184
February1st to 15thDay
20%9%35%41333437%
2050
16th to endDay
20%6%25%5%24446%35%
1840
March1st to 15thDay
19%8%35%5%34345%37%
2100
16th to endDay
16%5%25%6%2446%8%37%
2556
April1st to 15thDay
14%6%2443345%7%42%
2511
16th to endDay
12%5%25%5%3436%7%42%
2487
May1st to 15thDay
15%5%245%35%45%6%42%
2721
16th to endDay
10%5%35%5%35%5%6%8%40%
2847
June1st to 15thDay
8%425%6%35%5%7%9%40%
2652
16th to endDay
6%325%6%46%6%7%10%41%
2699
July1st to 15thDay
9%436%7%47%6%8%9%31%
2675
16th to endDay
7%316%7%48%8%8%10%34%
2673
August1st to 15thDay
5%5%25%7%5%8%7%7%11%33%
2302
16th to endDay
11%5%26%6%47%7%8%8%31%
2484
September1st to 15thDay
13%5%36%6%346%5%9%36%
2252
16th to endDay
11%3245%33447%48%
2145
October1st to 15thDay
11%425%424347%50%
2145
16th to endDay
13%413323235%55%
2015
November1st to 15thDay
15%424423335%49%
1852
16th to endDay
16%423424445%46%
1890
December1st to 15thDay
22%6%35%42444436%
1890
16th to endDay
24%8%25%423346%34%
2016
January1st to 15thNight
19%8%35%323335%41%
2717
16th to endNight
17%7%35%423335%41%
2741
February1st to 15thNight
19%8%34413345%39%
2463
16th to endNight
21%6%35%5%2443437%
2205
March1st to 15thNight
17%6%35%5%2445%7%38%
2519
16th to endNight
12%6%245%24447%44%
2381
April1st to 15thNight
12%42442345%8%47%
2097
16th to endNight
11%42432435%7%49%
2076
May1st to 15thNight
11%5%24424447%48%
1889
16th to endNight
6%414435%5%6%9%47%
1970
June1st to 15thNight
5%424425%6%6%11%46%
1836
16th to endNight
32143345%6%12%50%
1584
July1st to 15thNight
9%215%6%45%5%7%9%41%
1612
16th to endNight
5%315%5%36%5%7%12%42%
1847
August1st to 15thNight
5%314436%7%7%11%43%
1908
16th to endNight
7%426%5%35%5%6%10%42%
2070
September1st to 15thNight
9%4346%3445%8%43%
2025
16th to endNight
9%4245%34447%50%
2145
October1st to 15thNight
10%424423336%55%
2145
16th to endNight
13%424312345%54%
2555
November1st to 15thNight
13%423313436%51%
2666
16th to endNight
14%5%14313445%50%
2730
December1st to 15thNight
17%6%35%423346%40%
2730
16th to endNight
22%7%35%424345%35%
2912

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
48%26%20%19%2
1882
16th to endDay
41%39%22%19%3
2184
February1st to 15thDay
50%46%19%16%2
2052
16th to endDay
48%38%20%15%3
1840
March1st to 15thDay
48%48%17%15%6%
2100
16th to endDay
43%5%13%21%14%1
2557
April1st to 15thDay
40%49%23%17%4
2511
16th to endDay
39%49%24%18%4
2487
May1st to 15thDay
41%6%10%24%14%2
2721
16th to endDay
39%7%13%23%14%1
2851
June1st to 15thDay
37%7%14%22%15%1
2652
16th to endDay
34%8%15%20%16%4
2699
July1st to 15thDay
41%10%18%17%9%3
2530
16th to endDay
38%10%17%22%9%
2518
August1st to 15thDay
38%11%16%17%13%2
2289
16th to endDay
44%9%13%20%10%1
2484
September1st to 15thDay
43%8%14%17%12%4
2252
16th to endDay
35%5%10%22%21%4
2145
October1st to 15thDay
34%49%20%24%6%
2145
16th to endDay
32%35%19%29%9%
2015
November1st to 15thDay
37%26%18%27%7%
1852
16th to endDay
39%35%21%24%5%
1890
December1st to 15thDay
50%36%19%15%4
1890
16th to endDay
51%39%18%13%2
2016
January1st to 15thNight
46%26%22%17%4
2717
16th to endNight
44%36%21%18%4
2741
February1st to 15thNight
45%48%20%17%4
2472
16th to endNight
48%46%20%15%3
2205
March1st to 15thNight
45%47%19%16%7%
2519
16th to endNight
38%5%11%23%18%1
2381
April1st to 15thNight
34%411%23%19%5%
2097
16th to endNight
32%411%24%22%5%
2076
May1st to 15thNight
35%5%10%23%21%2
1890
16th to endNight
30%8%16%24%16%3
1972
June1st to 15thNight
29%8%14%26%18%2
1836
16th to endNight
25%9%16%26%18%3
1584
July1st to 15thNight
35%9%18%22%11%3
1528
16th to endNight
30%8%21%23%14%1
1739
August1st to 15thNight
29%10%19%21%16%2
1897
16th to endNight
35%8%18%22%12%3
2070
September1st to 15thNight
37%7%17%18%15%4
2025
16th to endNight
32%5%8%23%23%6%
2145
October1st to 15thNight
30%47%24%23%8%
2145
16th to endNight
32%3418%29%11%
2555
November1st to 15thNight
34%46%20%23%11%
2666
16th to endNight
36%36%19%27%6%
2730
December1st to 15thNight
43%48%20%18%4
2730
16th to endNight
50%38%18%14%2
2912

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%12%34%17%9%1
180
16th to endDay
21%8%44%17%43
192
February1st to 15thDay
34%12%32%13%7%
180
16th to endDay
35%8%28%20%7%
159
March1st to 15thDay
24%11%40%21%1
180
16th to endDay
17%6%33%27%13%1
416
April1st to 15thDay
16%8%26%30%14%4
390
16th to endDay
16%5%19%32%20%5%
379
May1st to 15thDay
15%318%27%20%13%
408
16th to endDay
12%312%24%23%23%
459
June1st to 15thDay
11%27%18%27%32%
411
16th to endDay
6%111%24%31%25%
539
July1st to 15thDay
8%15%21%30%32%
499
16th to endDay
7%1415%29%41%
390
August1st to 15thDay
9%316%38%32%
358
16th to endDay
13%1219%34%28%
396
September1st to 15thDay
14%16%18%33%25%
375
16th to endDay
13%17%21%38%17%
374
October1st to 15thDay
10%214%33%26%12%
375
16th to endDay
15%422%31%19%6%
244
November1st to 15thDay
24%427%30%12%1
180
16th to endDay
14%7%28%25%21%3
180
December1st to 15thDay
27%8%33%18%11%
180
16th to endDay
27%7%40%19%5%
192
January1st to 15thNight
21%7%37%25%7%
840
16th to endNight
20%6%38%30%4
896
February1st to 15thNight
22%7%36%28%5%
824
16th to endNight
23%8%34%31%2
735
March1st to 15thNight
20%6%36%31%5%
840
16th to endNight
12%6%32%33%13%
813
April1st to 15thNight
13%5%30%35%13%1
629
16th to endNight
12%325%37%19%1
624
May1st to 15thNight
12%219%35%26%3
630
16th to endNight
9%8%36%37%7%
659
June1st to 15thNight
7%16%34%41%8%
612
16th to endNight
41431%48%9%
585
July1st to 15thNight
9%1227%45%13%
555
16th to endNight
6%325%48%15%
612
August1st to 15thNight
5%1321%53%14%
575
16th to endNight
9%1128%49%9%
621
September1st to 15thNight
11%15%29%39%11%
660
16th to endNight
11%8%34%39%5%
777
October1st to 15thNight
12%216%31%30%6%
780
16th to endNight
14%420%33%23%2
832
November1st to 15thNight
17%421%33%19%3
820
16th to endNight
15%6%28%31%16%1
840
December1st to 15thNight
19%5%32%32%8%1
840
16th to endNight
25%5%32%30%6%
896
Page generated at 2019-06-10 18:29:48. Version ac04

Copyright 2019 A. Danko


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