Hickory
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Hickory clear sky chart from 2005-11-06 to 2024-11-25.

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
47%
25169
20%
97130
14%
24925
55%
24925
21%
59601

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
33%
753
26%
3982
12%
737
49%
737
19%
1985
January11th to 20thNight
30%
753
29%
3927
12%
740
45%
740
17%
2007
January21st to endNight
30%
830
17%
4441
13%
814
48%
814
16%
2649
February1st to 10thNight
35%
760
21%
2470
13%
760
46%
760
26%
1510
February11th to 20thNight
22%
740
22%
2228
8%
739
37%
739
24%
1443
February21st to endNight
27%
628
24%
1864
12%
628
39%
628
24%
1208
March1st to 10thNight
36%
757
22%
3404
14%
745
47%
745
16%
2266
March11th to 20thNight
30%
753
29%
3403
9%
740
40%
740
22%
1598
March21st to endNight
35%
830
14%
3695
9%
814
42%
814
18%
2160
April1st to 10thNight
36%
760
23%
2090
9%
760
47%
760
32%
1278
April11th to 20thNight
41%
751
23%
1894
11%
751
49%
751
34%
1202
April21st to endNight
47%
580
26%
1720
15%
580
53%
580
31%
1040
May1st to 10thNight
43%
564
19%
2800
10%
559
49%
559
16%
1719
May11th to 20thNight
49%
551
15%
2769
8%
541
52%
541
13%
1753
May21st to endNight
60%
599
15%
3036
13%
593
62%
593
19%
1557
June1st to 10thNight
63%
570
15%
1710
13%
570
65%
570
25%
1140
June11th to 20thNight
61%
570
13%
1710
11%
570
63%
570
27%
1131
June21st to endNight
67%
570
14%
1710
12%
570
68%
570
26%
1124
July1st to 10thNight
65%
539
12%
2706
10%
535
66%
535
14%
1810
July11th to 20thNight
68%
534
8%
2674
9%
533
68%
533
15%
1702
July21st to endNight
69%
612
8%
2971
10%
569
72%
569
12%
2323
August1st to 10thNight
62%
554
9%
2753
9%
544
63%
544
11%
1992
August11th to 20thNight
63%
549
10%
2721
15%
543
64%
543
13%
1835
August21st to endNight
66%
723
17%
2880
12%
722
68%
722
21%
1639
September1st to 10thNight
68%
760
20%
2085
17%
760
68%
760
29%
1369
September11th to 20thNight
58%
760
17%
2090
16%
760
59%
760
23%
1474
September21st to endNight
52%
760
19%
2090
15%
760
56%
760
25%
1465
October1st to 10thNight
56%
760
19%
2817
23%
740
60%
740
22%
1944
October11th to 20thNight
51%
760
27%
2348
23%
740
60%
740
30%
1422
October21st to endNight
53%
836
26%
2888
25%
814
64%
814
28%
1800
November1st to 10thNight
52%
780
27%
2341
21%
780
60%
780
32%
1401
November11th to 20thNight
45%
800
26%
2597
20%
800
56%
800
32%
1462
November21st to endNight
46%
779
28%
2529
20%
779
58%
779
32%
1439
December1st to 10thNight
37%
760
23%
2470
14%
760
49%
760
22%
1586
December11th to 20thNight
40%
759
28%
2910
18%
758
52%
758
24%
1642
December21st to endNight
32%
825
15%
4407
13%
817
43%
817
14%
2526

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%6%26%44446%8%43%
101396
Night
15%6%25%44445%7%44%
98039
TransparencyDay
37%7%12%21%17%5%
105099
Night
38%7%11%20%19%6%
102475
SeeingDay
17%7%21%25%20%11%
15276
Night
16%6%23%32%20%3
25349

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
17%413223246%55%
2836
11th to 20thDay
15%6%25%333345%52%
2840
21st to endDay
26%41432434446%
3124
February1st to 10thDay
15%6%25%5%4346%8%43%
1710
11th to 20thDay
19%7%35%23435%5%44%
1834
21st to endDay
19%6%25%5%44347%41%
1589
March1st to 10thDay
25%6%15%33335%6%40%
3435
11th to 20thDay
12%415%33435%6%53%
3480
21st to endDay
21%7%2443335%6%43%
3815
April1st to 10thDay
11%314345%35%8%51%
2090
11th to 20thDay
15%425%34335%7%48%
2240
21st to endDay
13%6%25%44435%7%47%
2470
May1st to 10thDay
12%6%27%6%5%5%5%7%9%36%
4082
11th to 20thDay
17%8%37%44445%8%36%
4081
21st to endDay
9%425%445%46%10%48%
4476
June1st to 10thDay
10%6%27%6%5%5%49%9%37%
2470
11th to 20thDay
7%5%26%6%6%6%5%7%10%40%
2470
21st to endDay
7%5%26%46%7%5%9%11%39%
2470
July1st to 10thDay
7%6%27%6%6%7%6%8%10%35%
4120
11th to 20thDay
7%6%38%6%6%7%5%7%11%34%
4120
21st to endDay
12%9%310%7%7%7%6%8%10%23%
4466
August1st to 10thDay
17%7%36%5%6%6%5%8%10%27%
4104
11th to 20thDay
9%5%36%5%5%6%5%8%11%37%
4044
21st to endDay
6%315%44446%11%52%
4290
September1st to 10thDay
10%426%46%447%8%43%
2090
11th to 20thDay
16%6%26%45%5%36%7%41%
2090
21st to endDay
20%5%25%445%35%6%40%
2090
October1st to 10thDay
15%5%2432325%6%55%
1990
11th to 20thDay
14%5%24222235%58%
1900
21st to endDay
16%5%24223235%57%
2090
November1st to 10thDay
14%5%25%323345%54%
1957
11th to 20thDay
14%6%24323247%53%
1800
21st to endDay
15%5%14334447%51%
1746
December1st to 10thDay
19%7%26%444345%42%
1710
11th to 20thDay
15%5%1432335%7%53%
2153
21st to endDay
20%6%25%33435%6%44%
3124
January1st to 10thNight
16%5%24333346%51%
4109
11th to 20thNight
12%6%26%43335%5%51%
4120
21st to endNight
25%6%24323345%43%
4532
February1st to 10thNight
16%5%25%44445%6%46%
2470
11th to 20thNight
19%7%25%34335%445%
2228
21st to endNight
17%7%25%344446%43%
1864
March1st to 10thNight
23%8%26%444345%39%
3418
11th to 20thNight
11%5%2433335%7%54%
3480
21st to endNight
19%5%25%34435%6%44%
3817
April1st to 10thNight
12%5%23444348%50%
2090
11th to 20thNight
14%6%25%43336%7%48%
1894
21st to endNight
14%425%44335%7%49%
1720
May1st to 10thNight
15%6%26%5%4445%7%41%
2813
11th to 20thNight
18%7%27%5%45%347%38%
2812
21st to endNight
10%5%25%44447%10%45%
3079
June1st to 10thNight
11%6%25%5%6%5%6%8%10%37%
1710
11th to 20thNight
11%6%26%6%5%6%46%9%40%
1710
21st to endNight
6%5%27%6%6%6%6%8%10%38%
1710
July1st to 10thNight
8%7%38%5%6%7%6%8%10%32%
2840
11th to 20thNight
9%6%26%6%5%7%5%8%12%34%
2840
21st to endNight
13%10%411%7%6%7%5%8%10%20%
3087
August1st to 10thNight
16%9%38%7%5%6%5%7%9%24%
2825
11th to 20thNight
11%7%39%6%6%5%6%8%9%30%
2785
21st to endNight
6%426%445%5%7%10%47%
3332
September1st to 10thNight
11%6%25%445%46%7%44%
2085
11th to 20thNight
16%7%27%6%5%5%35%7%38%
2090
21st to endNight
19%6%26%5%5%445%6%39%
2090
October1st to 10thNight
16%425%333345%51%
2190
11th to 20thNight
15%423333345%54%
2280
21st to endNight
14%41433423459%
2508
November1st to 10thNight
15%6%25%333335%53%
2341
11th to 20thNight
14%5%24333346%53%
2597
21st to endNight
14%42434436%6%51%
2529
December1st to 10thNight
19%7%26%43435%5%43%
2470
11th to 20thNight
16%6%2433335%451%
3042
21st to endNight
21%5%25%33435%6%42%
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
33%36%26%24%8%
2837
11th to 20thDay
35%46%16%33%5%
2840
21st to endDay
42%37%19%25%5%
3124
February1st to 10thDay
38%5%11%21%19%5%
1710
11th to 20thDay
40%5%9%19%20%6%
1844
21st to endDay
45%5%8%17%18%7%
1589
March1st to 10thDay
45%5%8%17%17%9%
3435
11th to 20thDay
31%6%8%20%23%12%
3480
21st to endDay
42%48%22%20%3
3815
April1st to 10thDay
31%5%12%22%24%5%
2090
11th to 20thDay
35%6%10%19%22%8%
2240
21st to endDay
36%7%11%24%17%4
2470
May1st to 10thDay
41%11%15%19%12%2
4120
11th to 20thDay
45%8%11%21%13%1
4085
21st to endDay
31%8%17%22%18%4
4489
June1st to 10thDay
39%9%15%23%11%1
2470
11th to 20thDay
36%11%16%21%14%2
2470
21st to endDay
35%12%16%20%15%2
2470
July1st to 10thDay
39%13%18%18%9%3
4055
11th to 20thDay
40%12%22%20%6%1
4051
21st to endDay
52%12%14%16%5%1
4324
August1st to 10thDay
48%10%17%20%5%
4091
11th to 20thDay
37%11%21%19%10%2
4083
21st to endDay
26%7%15%36%13%2
4290
September1st to 10thDay
36%9%13%21%18%3
2090
11th to 20thDay
42%7%12%18%18%3
2090
21st to endDay
44%7%9%19%17%4
2090
October1st to 10thDay
28%47%21%29%10%
3302
11th to 20thDay
21%36%20%26%24%
3140
21st to endDay
28%37%24%22%16%
3428
November1st to 10thDay
34%48%20%27%8%
1957
11th to 20thDay
33%38%23%26%7%
1800
21st to endDay
33%48%23%25%6%
1746
December1st to 10thDay
45%5%7%21%16%4
1710
11th to 20thDay
32%5%8%22%23%11%
2150
21st to endDay
41%49%24%19%3
3124
January1st to 10thNight
35%39%19%27%7%
4109
11th to 20thNight
35%48%16%29%7%
4120
21st to endNight
44%45%18%23%6%
4532
February1st to 10thNight
38%6%11%20%21%5%
2470
11th to 20thNight
42%48%17%21%7%
2229
21st to endNight
41%5%9%18%21%6%
1864
March1st to 10thNight
48%6%8%15%17%6%
3418
11th to 20thNight
30%5%8%20%22%15%
3480
21st to endNight
40%5%8%22%17%7%
3817
April1st to 10thNight
34%5%12%21%23%6%
2090
11th to 20thNight
35%5%9%21%22%8%
1894
21st to endNight
35%6%11%24%21%4
1720
May1st to 10thNight
42%8%13%24%12%1
2840
11th to 20thNight
45%8%12%20%14%1
2813
21st to endNight
30%10%15%27%16%1
3087
June1st to 10thNight
38%11%16%21%12%1
1710
11th to 20thNight
39%9%18%21%11%1
1710
21st to endNight
37%11%17%18%14%4
1710
July1st to 10thNight
43%13%16%17%9%2
2795
11th to 20thNight
39%12%24%20%41
2786
21st to endNight
55%13%14%13%4
2988
August1st to 10thNight
52%10%18%15%5%
2814
11th to 20thNight
44%12%20%14%9%1
2812
21st to endNight
28%10%14%32%13%2
3332
September1st to 10thNight
37%9%15%19%15%5%
2085
11th to 20thNight
45%9%11%16%17%2
2090
21st to endNight
45%7%11%17%16%4
2090
October1st to 10thNight
36%6%7%18%25%9%
3658
11th to 20thNight
22%36%23%27%19%
3779
21st to endNight
28%35%23%27%14%
4120
November1st to 10thNight
36%48%18%25%10%
2341
11th to 20thNight
34%48%19%25%11%
2597
21st to endNight
33%5%7%23%26%6%
2529
December1st to 10thNight
43%5%9%19%18%5%
2470
11th to 20thNight
35%48%17%26%9%
3044
21st to endNight
42%6%10%20%21%2
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
23%17%29%24%7%
270
11th to 20thDay
26%16%30%21%7%
270
21st to endDay
20%19%36%21%5%
297
February1st to 10thDay
21%14%33%23%8%
270
11th to 20thDay
34%16%31%16%3
270
21st to endDay
31%16%31%17%4
244
March1st to 10thDay
21%12%30%27%8%2
460
11th to 20thDay
19%13%37%25%41
460
21st to endDay
22%14%28%29%6%
506
April1st to 10thDay
17%14%32%22%12%2
460
11th to 20thDay
17%13%24%27%15%4
452
21st to endDay
18%7%30%23%16%6%
460
May1st to 10thDay
13%10%28%28%16%6%
463
11th to 20thDay
18%418%27%21%11%
487
21st to endDay
17%413%25%26%16%
529
June1st to 10thDay
11%415%30%27%13%
490
11th to 20thDay
10%317%24%25%21%
490
21st to endDay
11%113%27%33%15%
490
July1st to 10thDay
12%28%18%31%28%
485
11th to 20thDay
7%18%23%31%30%
484
21st to endDay
9%28%24%33%23%
532
August1st to 10thDay
15%211%24%27%21%
486
11th to 20thDay
13%49%23%31%22%
479
21st to endDay
11%19%21%30%28%
539
September1st to 10thDay
12%112%21%30%23%
490
11th to 20thDay
18%312%19%29%19%
490
21st to endDay
24%316%22%26%8%
490
October1st to 10thDay
19%215%27%24%12%
490
11th to 20thDay
14%7%21%28%22%8%
490
21st to endDay
18%5%18%31%20%8%
539
November1st to 10thDay
22%422%29%18%5%
495
11th to 20thDay
17%10%33%24%12%4
300
21st to endDay
12%10%32%28%15%3
282
December1st to 10thDay
27%11%25%29%8%
270
11th to 20thDay
17%9%33%28%11%1
270
21st to endDay
24%12%31%23%8%2
297
January1st to 10thNight
19%9%34%31%7%
760
11th to 20thNight
19%11%34%31%5%
760
21st to endNight
19%8%38%31%3
836
February1st to 10thNight
19%7%35%37%3
760
11th to 20thNight
23%11%40%25%2
743
21st to endNight
19%13%36%29%3
628
March1st to 10thNight
17%12%29%37%5%
760
11th to 20thNight
19%10%35%27%9%
760
21st to endNight
19%7%33%34%7%
836
April1st to 10thNight
14%11%36%29%10%
760
11th to 20thNight
17%11%26%32%13%1
751
21st to endNight
14%7%25%37%17%
580
May1st to 10thNight
15%5%26%37%16%1
570
11th to 20thNight
17%419%35%24%1
561
21st to endNight
17%211%31%35%5%
617
June1st to 10thNight
12%113%35%33%6%
570
11th to 20thNight
12%213%28%35%10%
570
21st to endNight
7%112%31%43%5%
570
July1st to 10thNight
13%26%25%46%8%
555
11th to 20thNight
10%15%24%49%10%
552
21st to endNight
9%26%31%43%9%
624
August1st to 10thNight
14%28%25%42%9%
567
11th to 20thNight
13%27%29%38%11%
564
21st to endNight
12%17%24%46%10%
744
September1st to 10thNight
12%28%29%40%9%
760
11th to 20thNight
17%211%26%36%7%
760
21st to endNight
22%214%31%28%2
760
October1st to 10thNight
17%316%29%29%6%
760
11th to 20thNight
18%422%34%19%2
760
21st to endNight
14%6%21%37%20%2
836
November1st to 10thNight
18%5%20%39%16%3
780
11th to 20thNight
16%6%27%39%11%1
800
21st to endNight
15%5%28%37%13%1
779
December1st to 10thNight
22%8%25%37%8%
760
11th to 20thNight
19%5%30%37%9%1
760
21st to endNight
25%6%28%34%7%
836
Page generated at 2024-11-22 08:02:28. Version ac07

Copyright © 2024 Attilla Danko.


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