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 2017-09-21.

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
52%
15248
23%
46728
18%
15205
58%
15205
30%
28728

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
29%
720
24%
2327
14%
716
42%
716
24%
1501
January16th to endNight
28%
768
24%
2349
12%
768
39%
768
23%
1567
February1st to 15thNight
29%
704
21%
2112
10%
701
39%
701
26%
1372
February16th to endNight
30%
631
22%
1893
12%
631
38%
631
24%
1256
March1st to 15thNight
33%
720
19%
2159
12%
720
39%
720
24%
1436
March16th to endNight
41%
697
21%
2041
14%
697
47%
697
29%
1290
April1st to 15thNight
47%
539
24%
1797
19%
539
56%
539
32%
1012
April16th to endNight
54%
540
26%
1798
21%
540
63%
540
33%
998
May1st to 15thNight
53%
540
21%
1620
15%
540
59%
540
30%
1014
May16th to endNight
68%
561
21%
1683
18%
561
70%
561
33%
1004
June1st to 15thNight
75%
540
20%
1620
16%
540
76%
540
35%
958
June16th to endNight
80%
540
22%
1462
18%
540
81%
540
40%
866
July1st to 15thNight
73%
510
15%
1404
14%
510
73%
510
31%
925
July16th to endNight
79%
564
19%
1595
18%
531
80%
531
35%
947
August1st to 15thNight
78%
539
18%
1780
20%
536
78%
536
32%
1026
August16th to endNight
73%
573
21%
1910
25%
573
73%
573
28%
1171
September1st to 15thNight
68%
609
20%
1869
20%
609
69%
609
30%
1163
September16th to endNight
67%
681
29%
1881
25%
681
69%
681
35%
1144
October1st to 15thNight
62%
660
36%
1815
30%
660
65%
660
40%
1045
October16th to endNight
56%
704
33%
2161
29%
704
62%
704
37%
1216
November1st to 15thNight
54%
700
30%
2276
27%
700
62%
700
35%
1248
November16th to endNight
42%
720
27%
2340
20%
720
53%
720
30%
1384
December1st to 15thNight
37%
720
22%
2340
16%
720
46%
720
24%
1485
December16th to endNight
32%
768
20%
2496
15%
768
39%
768
20%
1700

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
13%5%25%5%35%45%7%40%
48121
Night
12%5%2442445%7%45%
46920
TransparencyDay
41%6%11%20%16%3
47816
Night
37%5%10%21%19%5%
46729
SeeingDay
14%314%23%25%18%
5425
Night
14%421%31%23%4
15250

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
22%7%3442424438%
1611
16th to endDay
20%5%24323335%44%
1872
February1st to 15thDay
18%9%35%413335%40%
1750
16th to endDay
17%6%35%6%34446%38%
1580
March1st to 15thDay
18%8%36%5%34345%37%
1800
16th to endDay
16%5%25%6%2446%8%38%
2191
April1st to 15thDay
13%6%2443345%7%43%
2151
16th to endDay
12%5%25%5%35%36%6%42%
2160
May1st to 15thDay
16%5%245%25%446%40%
2331
16th to endDay
11%5%35%5%35%6%6%7%39%
2431
June1st to 15thDay
8%425%6%35%5%7%9%40%
2340
16th to endDay
6%325%6%45%6%7%10%41%
2491
July1st to 15thDay
10%425%7%47%6%8%9%32%
2469
16th to endDay
7%326%7%48%8%7%9%33%
2465
August1st to 15thDay
6%425%7%5%8%7%7%10%34%
2166
16th to endDay
11%5%26%6%46%6%8%9%32%
2292
September1st to 15thDay
13%5%26%6%346%6%9%36%
2079
16th to endDay
11%3245%43446%48%
1872
October1st to 15thDay
11%425%424346%51%
1815
16th to endDay
13%413313235%55%
1705
November1st to 15thDay
13%424423336%53%
1582
16th to endDay
17%423324445%46%
1620
December1st to 15thDay
22%6%25%42444436%
1620
16th to endDay
24%8%25%412236%37%
1728
January1st to 15thNight
19%7%35%323335%42%
2327
16th to endNight
17%8%36%433336%39%
2349
February1st to 15thNight
18%7%34423345%42%
2103
16th to endNight
19%6%35%42444440%
1893
March1st to 15thNight
17%6%25%5%2445%7%38%
2159
16th to endNight
13%5%245%24446%45%
2041
April1st to 15thNight
11%42442345%7%49%
1797
16th to endNight
10%42332435%7%50%
1798
May1st to 15thNight
10%5%3443445%7%46%
1619
16th to endNight
7%414425%5%6%8%48%
1682
June1st to 15thNight
5%324425%6%6%11%47%
1620
16th to endNight
3224335%6%6%12%49%
1462
July1st to 15thNight
9%315%6%45%5%6%9%42%
1488
16th to endNight
5%215%436%5%7%13%42%
1703
August1st to 15thNight
5%314426%7%7%10%44%
1791
16th to endNight
7%426%5%345%6%10%41%
1910
September1st to 15thNight
9%4345%3445%8%45%
1869
16th to endNight
9%4245%34347%50%
1881
October1st to 15thNight
10%323323336%56%
1815
16th to endNight
12%424312345%55%
2161
November1st to 15thNight
12%422313336%55%
2276
16th to endNight
15%6%24323435%49%
2340
December1st to 15thNight
17%6%35%423346%41%
2340
16th to endNight
22%7%35%42434437%
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
49%26%19%19%3
1612
16th to endDay
43%39%22%18%3
1872
February1st to 15thDay
47%37%19%18%3
1752
16th to endDay
46%38%20%16%3
1580
March1st to 15thDay
49%48%17%15%5%
1800
16th to endDay
43%5%14%21%13%1
2192
April1st to 15thDay
39%410%22%18%5%
2151
16th to endDay
39%410%24%18%3
2160
May1st to 15thDay
42%6%10%21%15%3
2331
16th to endDay
40%7%13%23%13%1
2435
June1st to 15thDay
37%8%15%23%14%1
2340
16th to endDay
34%8%13%20%17%4
2491
July1st to 15thDay
41%9%17%17%9%3
2324
16th to endDay
39%11%17%22%8%
2310
August1st to 15thDay
38%11%15%17%13%2
2153
16th to endDay
44%9%12%21%10%2
2292
September1st to 15thDay
42%7%13%18%12%4
2079
16th to endDay
35%5%10%21%22%4
1872
October1st to 15thDay
33%38%18%27%7%
1815
16th to endDay
31%35%19%30%9%
1705
November1st to 15thDay
34%25%19%30%8%
1582
16th to endDay
39%35%21%24%5%
1620
December1st to 15thDay
49%36%19%15%4
1620
16th to endDay
50%39%19%14%2
1728
January1st to 15thNight
45%36%21%19%4
2327
16th to endNight
46%36%19%18%4
2349
February1st to 15thNight
43%48%21%17%4
2112
16th to endNight
45%46%22%17%3
1893
March1st to 15thNight
44%5%8%18%16%6%
2159
16th to endNight
38%5%11%24%17%1
2041
April1st to 15thNight
32%412%22%20%6%
1797
16th to endNight
32%410%24%23%4
1798
May1st to 15thNight
37%6%11%20%21%2
1620
16th to endNight
31%8%16%25%14%3
1684
June1st to 15thNight
28%9%15%26%18%1
1620
16th to endNight
25%10%16%24%20%3
1462
July1st to 15thNight
36%8%17%21%12%3
1404
16th to endNight
29%8%20%24%14%1
1595
August1st to 15thNight
29%9%19%22%16%3
1780
16th to endNight
36%8%16%22%13%3
1910
September1st to 15thNight
36%7%17%18%16%4
1869
16th to endNight
33%5%8%22%22%7%
1881
October1st to 15thNight
30%37%22%26%10%
1815
16th to endNight
31%3418%30%12%
2161
November1st to 15thNight
30%35%21%25%13%
2276
16th to endNight
37%36%19%26%6%
2340
December1st to 15thNight
42%49%19%19%5%
2340
16th to endNight
50%38%18%16%3
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%14%25%16%11%2
90
16th to endDay
21%9%47%16%13
96
February1st to 15thDay
28%13%36%15%5%
90
16th to endDay
24%7%30%27%9%
81
March1st to 15thDay
23%12%36%24%21
90
16th to endDay
19%5%27%28%17%1
288
April1st to 15thDay
14%7%25%31%15%5%
270
16th to endDay
18%218%34%17%7%
270
May1st to 15thDay
17%419%26%19%12%
288
16th to endDay
12%312%26%23%21%
331
June1st to 15thDay
10%26%16%29%33%
315
16th to endDay
6%210%24%30%25%
466
July1st to 15thDay
9%16%24%30%27%
428
16th to endDay
7%1212%28%46%
326
August1st to 15thDay
9%317%38%30%
313
16th to endDay
15%1118%35%28%
332
September1st to 15thDay
14%17%17%32%26%
315
16th to endDay
14%17%22%40%13%
275
October1st to 15thDay
11%313%35%28%7%
255
16th to endDay
17%117%31%22%10%
140
November1st to 15thDay
17%422%34%20%1
90
16th to endDay
13%8%37%18%17%3
90
December1st to 15thDay
26%7%31%22%12%
90
16th to endDay
21%10%46%14%6%
96
January1st to 15thNight
20%8%36%25%7%
720
16th to endNight
21%5%38%30%3
768
February1st to 15thNight
20%7%37%29%5%
704
16th to endNight
20%8%36%32%2
631
March1st to 15thNight
20%5%34%32%6%
720
16th to endNight
13%7%31%32%15%1
697
April1st to 15thNight
12%6%30%35%13%1
539
16th to endNight
11%325%39%18%1
540
May1st to 15thNight
12%221%34%25%3
540
16th to endNight
9%9%37%36%5%
563
June1st to 15thNight
6%17%34%41%7%
540
16th to endNight
41431%48%10%
540
July1st to 15thNight
9%1330%45%10%
510
16th to endNight
6%324%49%15%
564
August1st to 15thNight
5%1322%53%13%
539
16th to endNight
9%1128%49%9%
573
September1st to 15thNight
11%15%30%38%11%
609
16th to endNight
11%8%35%39%5%
681
October1st to 15thNight
12%317%31%29%6%
660
16th to endNight
14%420%33%24%2
704
November1st to 15thNight
15%321%33%21%4
700
16th to endNight
16%6%30%30%15%1
720
December1st to 15thNight
20%5%30%33%8%1
720
16th to endNight
25%5%32%30%6%
768
Page generated at 2017-09-22 06:35:37. Version ac04

Copyright 2017 A. Danko


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