Pinehurst
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Pinehurst clear sky chart from 2005-11-06 to 2024-01-12.

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
44%
24483
21%
74325
13%
24434
53%
24434
26%
46919

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 10thNight
27%
757
23%
2459
10%
757
43%
757
23%
1485
January11th to 20thNight
30%
725
23%
2354
11%
725
46%
725
22%
1489
January21st to endNight
28%
792
28%
2574
13%
792
47%
792
26%
1532
February1st to 10thNight
30%
720
19%
2340
11%
720
42%
720
25%
1455
February11th to 20thNight
19%
701
21%
2223
8%
699
35%
699
21%
1409
February21st to endNight
26%
592
28%
1642
12%
592
41%
592
26%
1048
March1st to 10thNight
32%
720
25%
1980
13%
720
43%
720
31%
1225
March11th to 20thNight
29%
720
21%
1980
10%
720
39%
720
25%
1304
March21st to endNight
29%
792
20%
2178
9%
792
39%
792
25%
1451
April1st to 10thNight
32%
720
24%
1904
10%
720
43%
720
30%
1194
April11th to 20thNight
37%
711
25%
1775
9%
711
46%
711
34%
1131
April21st to endNight
42%
720
24%
1800
10%
720
49%
720
36%
1143
May1st to 10thNight
42%
552
19%
1632
10%
552
47%
552
30%
1016
May11th to 20thNight
49%
531
17%
1592
10%
531
54%
531
26%
1047
May21st to endNight
64%
582
16%
1744
13%
582
65%
582
26%
1163
June1st to 10thNight
59%
540
15%
1620
13%
540
60%
540
24%
1089
June11th to 20thNight
58%
540
14%
1620
10%
540
61%
540
24%
1092
June21st to endNight
64%
540
15%
1620
12%
540
66%
540
26%
1079
July1st to 10thNight
66%
525
12%
1575
10%
525
67%
525
22%
1085
July11th to 20thNight
70%
522
11%
1566
10%
522
71%
522
25%
1077
July21st to endNight
66%
591
14%
1672
11%
558
67%
558
26%
1120
August1st to 10thNight
63%
537
13%
1600
12%
534
63%
534
23%
1108
August11th to 20thNight
65%
563
15%
1627
12%
563
65%
563
24%
1129
August21st to endNight
61%
792
15%
1980
9%
792
62%
792
26%
1410
September1st to 10thNight
69%
720
23%
1802
17%
720
70%
720
32%
1204
September11th to 20thNight
58%
720
21%
1980
18%
720
60%
720
28%
1315
September21st to endNight
48%
720
17%
1986
13%
720
53%
720
23%
1396
October1st to 10thNight
55%
720
24%
2160
22%
720
61%
720
32%
1294
October11th to 20thNight
47%
720
30%
2160
24%
720
58%
720
33%
1257
October21st to endNight
48%
792
31%
2376
22%
792
61%
792
36%
1328
November1st to 10thNight
48%
740
28%
2221
21%
740
58%
740
34%
1287
November11th to 20thNight
40%
760
28%
2301
17%
760
53%
760
29%
1374
November21st to endNight
41%
760
28%
2470
19%
760
55%
760
30%
1417
December1st to 10thNight
34%
760
23%
2470
13%
760
47%
760
21%
1615
December11th to 20thNight
35%
759
26%
2945
17%
758
47%
758
22%
1739
December21st to endNight
35%
827
17%
4397
15%
817
46%
817
15%
2412

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%5%6%8%44%
74950
Night
14%5%25%5%345%5%7%45%
74766
TransparencyDay
38%7%12%20%18%5%
74672
Night
38%7%11%19%20%6%
74563
SeeingDay
15%10%25%25%18%7%
14349
Night
16%8%25%32%18%2
24500

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 10thDay
16%6%36%434345%47%
1706
11th to 20thDay
18%5%25%5%3435%5%46%
1629
21st to endDay
16%5%24424445%49%
1782
February1st to 10thDay
16%6%26%43446%7%42%
1620
11th to 20thDay
22%5%14423346%46%
1618
21st to endDay
20%6%26%5%3345%5%42%
1614
March1st to 10thDay
16%5%23323436%52%
1980
11th to 20thDay
15%5%26%5%35%5%6%8%41%
1980
21st to endDay
16%6%35%5%35%5%5%5%42%
2178
April1st to 10thDay
11%32443445%8%54%
2054
11th to 20thDay
13%423435%5%5%8%49%
2134
21st to endDay
13%425%435%45%7%49%
2162
May1st to 10thDay
9%5%35%6%45%6%6%8%44%
2340
11th to 20thDay
13%5%36%5%36%5%6%7%41%
2301
21st to endDay
11%5%35%5%45%5%7%8%40%
2531
June1st to 10thDay
10%5%35%6%45%6%7%10%39%
2340
11th to 20thDay
9%435%5%45%6%8%10%41%
2340
21st to endDay
8%325%6%46%7%9%11%38%
2340
July1st to 10thDay
8%5%36%7%46%7%8%11%34%
2340
11th to 20thDay
9%5%36%6%47%8%8%12%33%
2340
21st to endDay
7%6%25%7%47%8%8%12%35%
2547
August1st to 10thDay
12%7%36%6%47%6%9%11%30%
2327
11th to 20thDay
12%5%37%7%48%6%8%10%30%
2254
21st to endDay
10%5%36%7%46%7%7%10%35%
2376
September1st to 10thDay
8%426%5%36%6%6%10%44%
2154
11th to 20thDay
12%5%35%5%4446%8%44%
1980
21st to endDay
19%5%36%5%25%46%7%40%
1972
October1st to 10thDay
16%5%25%423346%50%
1800
11th to 20thDay
11%4245%23345%57%
1800
21st to endDay
12%5%24423345%57%
1980
November1st to 10thDay
13%6%24323345%56%
1857
11th to 20thDay
15%424224347%54%
1877
21st to endDay
14%5%25%43345%7%49%
1710
December1st to 10thDay
18%7%25%5%2446%6%42%
1710
11th to 20thDay
17%32341235%6%55%
2153
21st to endDay
16%6%36%434346%45%
3124
January1st to 10thNight
17%6%2442335%5%47%
2459
11th to 20thNight
14%7%245%345%5%5%44%
2354
21st to endNight
17%5%35%323446%49%
2574
February1st to 10thNight
17%6%25%434346%45%
2340
11th to 20thNight
20%6%2343345%5%43%
2223
21st to endNight
17%6%3342345%7%46%
1642
March1st to 10thNight
14%5%35%324346%50%
1980
11th to 20thNight
16%5%35%5%345%5%6%42%
1980
21st to endNight
16%5%26%5%345%5%5%44%
2178
April1st to 10thNight
14%42442446%7%50%
1904
11th to 20thNight
12%4246%34446%50%
1775
21st to endNight
12%324435%6%5%7%50%
1800
May1st to 10thNight
8%5%27%5%335%7%8%47%
1632
11th to 20thNight
13%5%25%5%46%5%6%9%40%
1592
21st to endNight
11%6%25%5%36%5%7%8%41%
1744
June1st to 10thNight
11%6%26%5%45%7%7%9%38%
1620
11th to 20thNight
11%5%35%5%47%6%6%10%38%
1620
21st to endNight
8%5%35%6%36%6%8%12%38%
1620
July1st to 10thNight
8%6%26%7%46%7%7%10%35%
1620
11th to 20thNight
7%5%26%6%47%6%9%13%37%
1620
21st to endNight
6%426%6%5%6%8%8%11%37%
1771
August1st to 10thNight
10%6%26%6%5%5%6%8%9%35%
1611
11th to 20thNight
11%6%26%6%36%7%7%11%34%
1627
21st to endNight
10%7%36%7%446%8%11%34%
1980
September1st to 10thNight
8%5%35%5%445%6%9%45%
1802
11th to 20thNight
13%6%25%5%3445%7%44%
1980
21st to endNight
18%6%36%5%3445%6%39%
1986
October1st to 10thNight
14%5%25%423446%51%
2160
11th to 20thNight
14%5%24424345%53%
2160
21st to endNight
13%5%14323346%56%
2376
November1st to 10thNight
12%6%25%333335%55%
2221
11th to 20thNight
13%6%2443435%6%51%
2301
21st to endNight
14%324424448%51%
2470
December1st to 10thNight
18%7%35%5%3445%6%41%
2470
11th to 20thNight
18%6%25%42334449%
3042
21st to endNight
18%5%2443445%6%46%
4532

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 10thDay
41%5%7%20%21%6%
1707
11th to 20thDay
41%5%7%19%23%6%
1629
21st to endDay
38%35%20%25%8%
1782
February1st to 10thDay
41%5%10%19%19%6%
1620
11th to 20thDay
41%47%18%24%7%
1627
21st to endDay
45%48%17%19%7%
1614
March1st to 10thDay
36%39%21%24%8%
1980
11th to 20thDay
41%7%10%19%16%7%
1980
21st to endDay
42%7%10%17%19%4
2178
April1st to 10thDay
29%6%10%21%26%7%
2054
11th to 20thDay
34%5%10%22%20%9%
2134
21st to endDay
35%7%10%24%19%5%
2162
May1st to 10thDay
35%9%14%20%18%3
2340
11th to 20thDay
41%8%15%20%15%1
2305
21st to endDay
39%10%14%21%15%1
2531
June1st to 10thDay
38%10%15%22%14%1
2340
11th to 20thDay
35%11%18%21%14%2
2340
21st to endDay
35%13%15%21%14%2
2340
July1st to 10thDay
38%12%19%18%11%2
2275
11th to 20thDay
39%13%20%19%6%2
2271
21st to endDay
36%14%20%20%9%1
2405
August1st to 10thDay
43%13%17%17%9%1
2314
11th to 20thDay
46%13%14%17%9%1
2254
21st to endDay
40%11%16%20%9%4
2376
September1st to 10thDay
34%9%16%18%17%5%
2154
11th to 20thDay
39%7%11%17%22%4
1980
21st to endDay
43%6%9%20%16%5%
1972
October1st to 10thDay
37%410%20%25%4
1800
11th to 20thDay
30%5%10%23%25%7%
1800
21st to endDay
31%5%6%22%27%10%
1980
November1st to 10thDay
31%48%19%29%9%
1857
11th to 20thDay
32%47%20%27%9%
1877
21st to endDay
36%47%21%22%9%
1710
December1st to 10thDay
43%5%10%20%19%4
1710
11th to 20thDay
33%37%21%27%10%
2150
21st to endDay
41%48%20%24%3
3124
January1st to 10thNight
39%49%17%25%6%
2459
11th to 20thNight
41%6%9%16%22%6%
2354
21st to endNight
38%35%20%26%7%
2574
February1st to 10thNight
41%49%18%20%7%
2340
11th to 20thNight
43%48%16%22%7%
2225
21st to endNight
38%5%9%18%20%8%
1642
March1st to 10thNight
36%5%9%18%24%10%
1980
11th to 20thNight
42%5%10%16%21%7%
1980
21st to endNight
41%7%11%18%19%4
2178
April1st to 10thNight
34%6%8%20%25%8%
1904
11th to 20thNight
34%6%9%21%21%9%
1775
21st to endNight
32%7%11%24%21%5%
1800
May1st to 10thNight
34%8%14%22%18%4
1632
11th to 20thNight
40%8%13%21%17%1
1593
21st to endNight
38%11%13%23%12%2
1745
June1st to 10thNight
39%11%15%21%12%2
1620
11th to 20thNight
40%11%15%20%13%1
1620
21st to endNight
36%13%16%20%12%3
1620
July1st to 10thNight
41%13%17%17%11%3
1575
11th to 20thNight
35%16%22%18%8%1
1566
21st to endNight
36%14%21%19%10%
1672
August1st to 10thNight
41%12%19%21%6%1
1600
11th to 20thNight
41%11%20%17%8%1
1627
21st to endNight
41%11%17%20%9%2
1980
September1st to 10thNight
35%10%13%21%15%6%
1802
11th to 20thNight
39%9%13%16%21%3
1980
21st to endNight
46%7%11%16%16%4
1986
October1st to 10thNight
35%410%20%26%5%
2160
11th to 20thNight
33%48%21%25%9%
2160
21st to endNight
30%48%21%25%12%
2376
November1st to 10thNight
33%46%18%25%14%
2221
11th to 20thNight
36%47%16%25%13%
2301
21st to endNight
34%46%21%25%9%
2470
December1st to 10thNight
44%6%9%17%19%6%
2470
11th to 20thNight
39%47%18%24%9%
3044
21st to endNight
40%47%21%25%3
4532

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 10thDay
19%24%36%17%3
270
11th to 20thDay
19%26%37%14%5%
243
21st to endDay
18%27%39%12%4
264
February1st to 10thDay
21%23%35%17%4
240
11th to 20thDay
34%20%37%9%1
240
21st to endDay
23%23%33%17%31
332
March1st to 10thDay
20%20%30%24%5%
420
11th to 20thDay
20%20%38%16%5%1
420
21st to endDay
21%16%34%20%7%2
462
April1st to 10thDay
16%20%31%23%9%1
420
11th to 20thDay
14%17%30%21%14%4
412
21st to endDay
14%14%28%26%16%3
420
May1st to 10thDay
11%16%36%22%12%3
423
11th to 20thDay
14%7%20%29%24%6%
447
21st to endDay
15%220%27%23%12%
485
June1st to 10thDay
12%222%30%26%7%
450
11th to 20thDay
10%320%28%27%12%
450
21st to endDay
7%416%30%33%10%
450
July1st to 10thDay
11%17%28%34%19%
445
11th to 20thDay
9%19%27%36%17%
444
21st to endDay
7%111%33%36%12%
488
August1st to 10thDay
14%312%28%26%16%
446
11th to 20thDay
12%39%28%30%18%
439
21st to endDay
12%213%27%25%21%
495
September1st to 10thDay
9%214%28%25%22%
450
11th to 20thDay
15%214%31%26%12%
450
21st to endDay
19%422%26%23%6%
450
October1st to 10thDay
16%6%23%23%23%9%
450
11th to 20thDay
12%10%24%27%20%7%
450
21st to endDay
13%10%25%31%17%4
495
November1st to 10thDay
19%8%27%28%15%3
455
11th to 20thDay
18%14%33%25%9%1
437
21st to endDay
14%15%33%26%9%2
270
December1st to 10thDay
22%16%41%17%4
270
11th to 20thDay
21%14%37%17%8%2
270
21st to endDay
23%14%37%17%7%2
297
January1st to 10thNight
21%15%32%26%6%1
760
11th to 20thNight
17%13%35%30%6%
725
21st to endNight
20%10%38%28%3
792
February1st to 10thNight
20%12%35%28%5%
720
11th to 20thNight
24%15%40%20%2
703
21st to endNight
20%14%36%26%31
592
March1st to 10thNight
18%12%35%31%41
720
11th to 20thNight
19%11%37%25%8%1
720
21st to endNight
18%12%36%27%7%
792
April1st to 10thNight
16%15%33%28%7%
720
11th to 20thNight
14%12%34%30%10%
711
21st to endNight
13%7%34%37%9%
720
May1st to 10thNight
11%9%34%36%11%
552
11th to 20thNight
15%325%39%17%1
531
21st to endNight
13%313%41%29%2
584
June1st to 10thNight
11%317%42%24%3
540
11th to 20thNight
11%416%33%29%6%
540
21st to endNight
9%215%37%33%4
540
July1st to 10thNight
9%210%37%37%6%
525
11th to 20thNight
8%11%34%40%7%
522
21st to endNight
7%213%38%36%4
591
August1st to 10thNight
12%28%37%37%5%
537
11th to 20thNight
13%110%35%35%6%
563
21st to endNight
12%211%30%39%6%
792
September1st to 10thNight
10%210%35%38%6%
720
11th to 20thNight
15%216%29%34%4
720
21st to endNight
22%318%32%23%3
720
October1st to 10thNight
16%5%18%30%26%5%
720
11th to 20thNight
14%7%28%29%20%2
720
21st to endNight
15%7%26%31%19%2
792
November1st to 10thNight
15%8%26%33%16%3
740
11th to 20thNight
16%11%29%32%11%1
760
21st to endNight
15%8%30%31%15%1
760
December1st to 10thNight
20%10%29%36%6%
760
11th to 20thNight
19%9%31%31%9%
760
21st to endNight
22%11%27%32%8%
836
Page generated at 2024-01-08 22:31:29. Version ac07

Copyright 2024 Attilla Danko


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