North Fork Campground
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the North Fork Campground clear sky chart from 2005-11-05 to 2018-02-13.

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
57%
15454
21%
48761
19%
15430
60%
15430
29%
29564

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
48%
776
11%
2716
10%
776
50%
776
16%
1923
January16th to endNight
54%
832
17%
2912
19%
832
56%
832
21%
1928
February1st to 15thNight
48%
744
13%
2363
12%
744
51%
744
21%
1625
February16th to endNight
46%
632
15%
1895
14%
632
50%
632
20%
1343
March1st to 15thNight
44%
720
12%
2160
11%
720
47%
720
20%
1520
March16th to endNight
43%
768
14%
2026
9%
768
46%
768
26%
1405
April1st to 15thNight
46%
719
20%
1799
10%
719
50%
719
30%
1202
April16th to endNight
51%
606
22%
1686
13%
606
55%
606
33%
1041
May1st to 15thNight
53%
539
23%
1619
17%
539
58%
539
39%
874
May16th to endNight
60%
379
17%
1501
21%
379
64%
379
25%
846
June1st to 15thNight
58%
360
16%
1440
21%
360
63%
360
24%
797
June16th to endNight
71%
360
27%
1440
39%
360
77%
360
47%
585
July1st to 15thNight
80%
340
26%
1360
37%
340
85%
340
49%
546
July16th to endNight
85%
376
36%
1416
47%
354
89%
354
59%
513
August1st to 15thNight
77%
479
32%
1552
29%
477
80%
477
47%
745
August16th to endNight
81%
748
39%
1894
24%
748
82%
748
67%
925
September1st to 15thNight
78%
720
36%
1833
23%
720
81%
720
61%
934
September16th to endNight
73%
716
36%
1980
31%
716
75%
716
48%
1058
October1st to 15thNight
62%
720
27%
2031
21%
720
68%
720
43%
1118
October16th to endNight
64%
768
27%
2475
27%
768
68%
768
33%
1405
November1st to 15thNight
52%
760
22%
2470
21%
760
55%
760
25%
1552
November16th to endNight
48%
780
15%
2551
13%
780
53%
780
21%
1698
December1st to 15thNight
50%
780
12%
2730
11%
780
52%
780
19%
1840
December16th to endNight
38%
832
15%
2912
14%
832
42%
832
14%
2141

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
7%8%35%424446%48%
49300
Night
7%8%35%42445%7%46%
48934
TransparencyDay
35%5%9%18%18%11%
48971
Night
36%5%11%20%17%8%
48762
SeeingDay
10%9%25%28%18%6%
5868
Night
10%5%17%35%24%5%
15468

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
10%10%410%6%345%6%7%28%
1552
16th to endDay
10%14%47%5%3445%6%33%
1664
February1st to 15thDay
7%11%5%6%5%25%5%6%7%35%
1762
16th to endDay
6%13%6%9%7%345%47%31%
1579
March1st to 15thDay
10%14%7%7%5%35%45%6%29%
1800
16th to endDay
10%13%5%7%445%5%5%8%30%
2196
April1st to 15thDay
9%11%5%7%6%45%46%7%31%
2149
16th to endDay
9%9%35%42335%6%45%
2272
May1st to 15thDay
5%6%245%34447%50%
2331
16th to endDay
9%8%36%5%36%45%7%38%
2607
June1st to 15thDay
10%5%25%425%5%5%7%45%
2520
16th to endDay
222223336%67%
2520
July1st to 15thDay
3212323446%65%
2520
16th to endDay
221231323473%
2657
August1st to 15thDay
3313323346%63%
2400
16th to endDay
211312345%72%
2306
September1st to 15thDay
232222235%72%
2127
16th to endDay
6%6%13312335%61%
1980
October1st to 15thDay
7%5%25%323336%55%
1929
16th to endDay
8%7%25%42445%5%48%
1749
November1st to 15thDay
10%12%45%6%2345%6%37%
1719
16th to endDay
10%12%46%43446%7%35%
1737
December1st to 15thDay
12%10%48%5%34448%33%
1560
16th to endDay
14%15%6%9%7%33446%24%
1664
January1st to 15thNight
9%14%5%8%6%35%45%7%30%
2716
16th to endNight
10%12%35%5%3435%7%36%
2912
February1st to 15thNight
9%10%47%5%445%5%6%35%
2352
16th to endNight
5%13%6%8%5%35%5%6%7%32%
1895
March1st to 15thNight
9%13%48%5%3445%5%33%
2160
16th to endNight
9%9%47%5%345%6%7%35%
2026
April1st to 15thNight
8%7%36%5%25%5%6%8%41%
1799
16th to endNight
8%7%2442335%5%49%
1686
May1st to 15thNight
5%415%424346%57%
1619
16th to endNight
7%6%24436%5%7%9%42%
1501
June1st to 15thNight
7%5%45%5%25%45%6%47%
1440
16th to endNight
2312313447%66%
1440
July1st to 15thNight
1213135%47%68%
1440
16th to endNight
1111212335%74%
1512
August1st to 15thNight
3113225%447%62%
1560
16th to endNight
111221133475%
1894
September1st to 15thNight
2312212225%72%
1833
16th to endNight
5%412223436%61%
1980
October1st to 15thNight
6%413323346%58%
2031
16th to endNight
8%5%25%42445%8%49%
2475
November1st to 15thNight
11%9%25%42445%8%40%
2470
16th to endNight
9%10%46%6%34446%37%
2551
December1st to 15thNight
11%12%47%434449%33%
2730
16th to endNight
14%15%5%9%5%24346%27%
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
52%9%16%14%5%
1552
16th to endDay
50%8%14%13%10%2
1664
February1st to 15thDay
44%9%18%17%8%1
1762
16th to endDay
52%7%13%19%6%1
1579
March1st to 15thDay
54%7%10%18%6%1
1800
16th to endDay
49%7%15%17%8%1
2196
April1st to 15thDay
49%5%14%18%10%1
2149
16th to endDay
38%413%26%13%3
2272
May1st to 15thDay
31%5%9%26%22%3
2331
16th to endDay
44%5%11%21%14%2
2611
June1st to 15thDay
36%5%8%23%20%6%
2520
16th to endDay
17%35%20%36%16%
2520
July1st to 15thDay
18%3412%30%29%
2371
16th to endDay
15%127%26%46%
2490
August1st to 15thDay
21%4411%26%31%
2383
16th to endDay
15%3214%31%33%
2306
September1st to 15thDay
16%2415%30%30%
2127
16th to endDay
25%35%21%28%14%
1980
October1st to 15thDay
30%49%26%19%9%
1929
16th to endDay
35%5%9%24%21%4
1749
November1st to 15thDay
46%5%13%19%11%2
1719
16th to endDay
45%6%13%21%12%1
1737
December1st to 15thDay
49%8%16%18%5%1
1560
16th to endDay
58%7%11%14%7%
1664
January1st to 15thNight
50%7%15%18%6%1
2716
16th to endNight
45%6%12%19%10%5%
2912
February1st to 15thNight
45%8%15%20%7%3
2363
16th to endNight
47%7%16%20%6%1
1895
March1st to 15thNight
49%6%11%20%9%1
2160
16th to endNight
43%6%16%23%8%1
2026
April1st to 15thNight
39%6%13%27%12%1
1799
16th to endNight
33%5%12%27%16%2
1686
May1st to 15thNight
26%410%27%26%4
1620
16th to endNight
33%8%13%26%15%2
1501
June1st to 15thNight
35%5%10%22%21%4
1440
16th to endNight
17%36%24%34%14%
1440
July1st to 15thNight
15%4415%29%30%
1360
16th to endNight
11%218%30%44%
1416
August1st to 15thNight
20%4315%27%28%
1552
16th to endNight
13%2316%28%35%
1894
September1st to 15thNight
16%3313%33%30%
1833
16th to endNight
23%35%20%30%16%
1980
October1st to 15thNight
26%49%27%23%9%
2031
16th to endNight
32%5%10%23%23%5%
2475
November1st to 15thNight
40%6%11%23%16%3
2470
16th to endNight
46%5%13%20%12%2
2551
December1st to 15thNight
46%7%18%19%7%1
2730
16th to endNight
56%5%9%19%7%
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
17%414%21%24%17%
90
16th to endDay
16%328%28%15%8%
96
February1st to 15thDay
13%10%25%24%23%4
259
16th to endDay
12%15%30%27%11%2
238
March1st to 15thDay
15%14%30%21%17%
270
16th to endDay
16%14%31%28%9%
288
April1st to 15thDay
13%17%24%23%14%5%
269
16th to endDay
17%16%28%23%10%3
270
May1st to 15thDay
8%15%29%26%15%3
288
16th to endDay
14%7%19%26%20%10%
330
June1st to 15thDay
11%10%28%29%14%5%
315
16th to endDay
29%26%33%19%8%
315
July1st to 15thDay
7%5%22%32%21%9%
305
16th to endDay
35%29%37%16%7%
327
August1st to 15thDay
6%328%36%17%7%
315
16th to endDay
3325%31%25%11%
332
September1st to 15thDay
45%26%26%21%14%
315
16th to endDay
8%10%21%32%22%5%
315
October1st to 15thDay
9%14%25%27%18%4
315
16th to endDay
15%6%20%29%23%5%
165
November1st to 15thDay
17%322%29%27%
135
16th to endDay
20%13%23%29%13%
130
December1st to 15thDay
24%5%20%22%13%14%
90
16th to endDay
19%9%18%29%20%2
96
January1st to 15thNight
13%8%16%31%23%6%
780
16th to endNight
15%5%13%32%25%7%
832
February1st to 15thNight
12%6%20%35%22%3
752
16th to endNight
9%9%23%35%18%4
632
March1st to 15thNight
13%8%24%29%21%3
720
16th to endNight
14%9%26%32%16%1
768
April1st to 15thNight
10%8%23%33%19%4
719
16th to endNight
11%8%22%33%18%5%
606
May1st to 15thNight
6%8%26%32%24%2
540
16th to endNight
11%415%32%29%5%
380
June1st to 15thNight
9%5%15%41%23%4
360
16th to endNight
3417%42%29%2
360
July1st to 15thNight
219%49%33%3
340
16th to endNight
27%49%36%2
376
August1st to 15thNight
412%46%34%2
479
16th to endNight
2210%42%35%6%
748
September1st to 15thNight
411%36%35%12%
720
16th to endNight
8%311%33%33%10%
716
October1st to 15thNight
9%417%35%26%6%
720
16th to endNight
8%5%12%36%27%9%
768
November1st to 15thNight
15%5%18%32%23%4
760
16th to endNight
12%7%21%31%19%6%
780
December1st to 15thNight
15%6%18%34%20%5%
780
16th to endNight
19%8%21%34%14%1
832
Page generated at 2018-02-13 18:46:04. Version ac04

Copyright 2018 A. Danko


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