This page made possible by the sponsorship of: Paul Landman.

Dingmans Ferry
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Dingmans Ferry clear sky chart from 2005-11-05 to 2020-06-03.

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
28%
18491
20%
57822
9%
18460
40%
18460
19%
36906

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
17%
900
20%
3136
7%
896
34%
896
14%
1984
January16th to endNight
17%
960
21%
3218
6%
960
36%
960
14%
2003
February1st to 15thNight
14%
884
17%
2840
3%
881
30%
881
14%
1898
February16th to endNight
15%
791
25%
2373
7%
791
37%
791
14%
1549
March1st to 15thNight
16%
900
20%
2650
6%
900
32%
900
15%
1743
March16th to endNight
18%
960
23%
2519
6%
960
31%
960
19%
1663
April1st to 15thNight
18%
898
18%
2246
4%
898
26%
898
17%
1587
April16th to endNight
23%
891
18%
2227
3%
891
32%
891
21%
1541
May1st to 15thNight
24%
576
17%
1926
9%
576
34%
576
15%
1283
May16th to endNight
35%
470
15%
1881
11%
470
45%
470
15%
1160
June1st to 15thNight
37%
425
16%
1701
15%
425
48%
425
18%
1036
June16th to endNight
44%
420
16%
1680
13%
420
56%
420
25%
921
July1st to 15thNight
53%
400
16%
1600
18%
400
58%
400
22%
917
July16th to endNight
50%
440
16%
1674
15%
418
59%
418
24%
941
August1st to 15thNight
50%
631
18%
1862
12%
629
55%
629
29%
1155
August16th to endNight
52%
892
19%
2230
9%
892
56%
892
32%
1465
September1st to 15thNight
39%
840
22%
2100
10%
840
45%
840
29%
1398
September16th to endNight
48%
837
28%
2272
18%
837
56%
837
33%
1375
October1st to 15thNight
35%
840
20%
2502
14%
840
44%
840
22%
1629
October16th to endNight
26%
896
22%
2772
10%
896
41%
896
22%
1721
November1st to 15thNight
27%
880
21%
2862
10%
880
42%
880
19%
1774
November16th to endNight
23%
900
22%
3041
10%
900
40%
900
17%
1872
December1st to 15thNight
21%
900
16%
3150
7%
900
33%
900
11%
2110
December16th to endNight
16%
960
19%
3360
5%
960
33%
960
12%
2181

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
16%6%25%5%35%45%7%37%
58599
Night
16%6%2442445%7%41%
57992
Cloud CoverDay
16%6%25%5%3445%7%37%
58608
Night
16%6%2443445%6%41%
57998
TransparencyDay
45%411%22%14%1
58287
Night
42%412%24%15%1
57822
SeeingDay
24%19%25%18%9%3
9131
Night
20%23%23%23%8%
18492

By Month

Percentage Cloud Cover NE (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
13%7%36%6%35%446%38%
1792
16th to endDay
14%7%25%5%36%45%6%37%
2061
February1st to 15thDay
16%8%46%6%3445%6%33%
2010
16th to endDay
15%7%36%6%245%36%37%
1980
March1st to 15thDay
14%7%45%5%3446%7%34%
2289
16th to endDay
16%7%36%5%34336%38%
2760
April1st to 15thDay
18%8%25%424446%36%
2692
16th to endDay
18%5%25%424445%39%
2668
May1st to 15thDay
21%6%35%5%25%447%33%
3026
16th to endDay
17%6%25%5%35%5%5%8%35%
3290
June1st to 15thDay
18%5%25%5%45%5%5%9%32%
2968
16th to endDay
14%6%26%6%3445%8%36%
2940
July1st to 15thDay
12%5%246%36%5%6%8%37%
2940
16th to endDay
11%5%26%5%36%6%6%9%37%
3102
August1st to 15thDay
13%5%16%6%46%5%7%7%34%
2655
16th to endDay
13%5%15%5%345%5%8%41%
2676
September1st to 15thDay
18%5%244345%47%40%
2520
16th to endDay
13%425%424446%45%
2347
October1st to 15thDay
19%6%25%5%23447%38%
2116
16th to endDay
20%6%1443435%5%40%
2156
November1st to 15thDay
18%7%14413346%43%
1986
16th to endDay
18%5%33324446%41%
1905
December1st to 15thDay
17%9%46%5%25%446%34%
1800
16th to endDay
19%8%35%5%44448%31%
1920
January1st to 15thNight
15%7%25%435%46%6%38%
3136
16th to endNight
13%7%35%5%3445%6%40%
3218
February1st to 15thNight
16%7%35%5%3445%6%36%
2839
16th to endNight
16%6%26%5%2445%6%39%
2373
March1st to 15thNight
17%6%25%42445%6%39%
2637
16th to endNight
15%6%25%42435%6%41%
2519
April1st to 15thNight
16%7%35%5%3445%6%35%
2246
16th to endNight
19%5%24333446%40%
2227
May1st to 15thNight
19%6%36%434346%36%
1926
16th to endNight
15%425%5%345%47%39%
1879
June1st to 15thNight
19%5%24323348%40%
1701
16th to endNight
11%4234245%5%8%46%
1680
July1st to 15thNight
10%425%3345%5%9%44%
1680
16th to endNight
12%313336%5%7%10%43%
1770
August1st to 15thNight
11%4344245%5%9%43%
1872
16th to endNight
13%4145%2446%7%44%
2230
September1st to 15thNight
17%5%24423446%44%
2100
16th to endNight
12%424423436%51%
2272
October1st to 15thNight
20%5%24423336%43%
2502
16th to endNight
19%6%13313346%44%
2772
November1st to 15thNight
16%5%24424446%44%
2862
16th to endNight
16%6%25%324446%42%
3041
December1st to 15thNight
18%7%35%5%25%45%6%34%
3150
16th to endNight
17%7%2443435%7%38%
3360

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
13%7%35%6%35%45%6%38%
1792
16th to endDay
14%7%25%5%35%45%7%38%
2061
February1st to 15thDay
16%9%36%6%3445%6%33%
2010
16th to endDay
15%7%36%6%25%446%37%
1980
March1st to 15thDay
15%7%45%5%35%45%7%35%
2299
16th to endDay
17%7%35%5%24436%38%
2759
April1st to 15thDay
18%7%35%435%346%37%
2692
16th to endDay
18%5%26%5%24445%39%
2668
May1st to 15thDay
21%6%25%5%34446%33%
3026
16th to endDay
17%6%25%5%3445%7%35%
3290
June1st to 15thDay
18%5%25%5%35%5%5%9%32%
2968
16th to endDay
14%6%25%6%35%5%5%8%36%
2940
July1st to 15thDay
11%5%25%6%36%5%6%8%37%
2940
16th to endDay
10%5%35%5%35%5%6%9%37%
3102
August1st to 15thDay
12%6%25%7%45%6%7%7%34%
2655
16th to endDay
13%5%15%5%245%5%8%41%
2676
September1st to 15thDay
17%6%25%434446%40%
2520
16th to endDay
13%426%42445%6%45%
2347
October1st to 15thDay
19%6%25%424446%39%
2116
16th to endDay
20%5%15%423445%40%
2156
November1st to 15thDay
19%6%24413345%43%
1986
16th to endDay
18%6%24334446%41%
1905
December1st to 15thDay
17%9%46%5%35%445%35%
1800
16th to endDay
19%7%35%5%34447%32%
1920
January1st to 15thNight
16%7%35%33446%6%38%
3136
16th to endNight
13%7%35%5%2445%6%40%
3218
February1st to 15thNight
16%8%35%5%34446%37%
2832
16th to endNight
16%6%26%424447%39%
2373
March1st to 15thNight
17%6%35%42445%6%39%
2650
16th to endNight
16%7%25%42435%6%41%
2519
April1st to 15thNight
17%6%35%5%3445%7%35%
2246
16th to endNight
19%5%24323447%40%
2227
May1st to 15thNight
19%6%26%5%3435%6%36%
1926
16th to endNight
15%6%246%346%47%39%
1879
June1st to 15thNight
19%424424348%40%
1701
16th to endNight
11%3243336%48%46%
1680
July1st to 15thNight
10%42443446%10%43%
1680
16th to endNight
11%313335%6%6%10%43%
1770
August1st to 15thNight
11%5%244245%5%8%43%
1872
16th to endNight
13%4135%245%6%8%44%
2230
September1st to 15thNight
17%424434346%44%
2100
16th to endNight
12%424423336%51%
2272
October1st to 15thNight
20%5%25%323335%43%
2502
16th to endNight
19%6%14313446%45%
2772
November1st to 15thNight
16%6%34324446%45%
2862
16th to endNight
16%6%25%42345%6%42%
3041
December1st to 15thNight
19%8%25%5%35%45%6%33%
3150
16th to endNight
17%7%2443435%6%37%
3360

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
46%310%23%11%3
1793
16th to endDay
45%212%22%13%2
2061
February1st to 15thDay
51%410%19%12%1
2013
16th to endDay
48%38%23%14%1
1980
March1st to 15thDay
47%313%22%11%2
2299
16th to endDay
47%38%20%16%3
2760
April1st to 15thDay
47%310%21%13%3
2692
16th to endDay
45%37%22%17%3
2668
May1st to 15thDay
49%39%20%13%2
3026
16th to endDay
46%5%12%21%13%1
3294
June1st to 15thDay
47%5%12%21%12%
2968
16th to endDay
44%411%24%13%
2940
July1st to 15thDay
43%410%21%17%1
2791
16th to endDay
40%5%13%24%13%2
2935
August1st to 15thDay
45%5%12%22%13%
2641
16th to endDay
39%5%10%25%17%1
2676
September1st to 15thDay
43%5%10%21%18%1
2520
16th to endDay
38%38%23%23%2
2347
October1st to 15thDay
45%411%20%15%2
2116
16th to endDay
45%210%23%15%1
2156
November1st to 15thDay
42%312%22%15%3
1986
16th to endDay
42%311%26%14%1
1905
December1st to 15thDay
50%315%18%11%1
1800
16th to endDay
50%413%20%10%
1920
January1st to 15thNight
44%311%23%13%2
3136
16th to endNight
42%412%25%14%1
3218
February1st to 15thNight
47%313%21%11%1
2840
16th to endNight
44%37%24%17%2
2373
March1st to 15thNight
44%312%24%13%2
2650
16th to endNight
42%310%22%19%2
2519
April1st to 15thNight
47%310%21%15%1
2246
16th to endNight
44%47%22%18%2
2227
May1st to 15thNight
48%311%19%15%1
1926
16th to endNight
42%6%15%21%11%2
1881
June1st to 15thNight
42%413%24%14%
1701
16th to endNight
34%416%29%14%1
1680
July1st to 15thNight
36%6%13%25%16%2
1600
16th to endNight
33%7%17%24%13%2
1674
August1st to 15thNight
36%5%15%26%15%1
1862
16th to endNight
37%5%12%22%20%1
2230
September1st to 15thNight
40%412%25%17%
2100
16th to endNight
34%37%25%26%2
2272
October1st to 15thNight
43%311%24%15%2
2502
16th to endNight
40%213%27%14%
2772
November1st to 15thNight
40%312%22%17%2
2862
16th to endNight
42%213%26%13%1
3041
December1st to 15thNight
49%313%22%10%
3150
16th to endNight
46%413%25%10%
3360

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
32%28%25%10%3
150
16th to endDay
31%22%33%6%21
207
February1st to 15thDay
35%26%28%8%1
257
16th to endDay
29%30%25%12%2
399
March1st to 15thDay
26%29%26%14%3
450
16th to endDay
26%27%30%11%31
480
April1st to 15thDay
29%26%25%13%4
450
16th to endDay
28%23%25%12%7%2
439
May1st to 15thDay
34%24%19%13%7%1
468
16th to endDay
20%17%27%21%10%2
523
June1st to 15thDay
20%21%25%21%9%1
443
16th to endDay
20%16%28%22%10%1
435
July1st to 15thDay
15%9%24%26%18%5%
425
16th to endDay
14%11%24%27%16%5%
454
August1st to 15thDay
16%9%24%27%15%6%
418
16th to endDay
12%8%25%25%18%9%
460
September1st to 15thDay
23%11%23%21%11%8%
435
16th to endDay
16%7%28%20%14%13%
434
October1st to 15thDay
25%11%22%23%13%3
435
16th to endDay
27%21%24%17%8%1
434
November1st to 15thDay
25%22%20%20%9%1
370
16th to endDay
27%22%27%16%4
255
December1st to 15thDay
37%18%27%10%6%
150
16th to endDay
32%23%34%6%2
160
January1st to 15thNight
21%30%26%17%4
900
16th to endNight
19%32%25%20%2
960
February1st to 15thNight
23%29%29%16%1
884
16th to endNight
25%31%23%17%1
791
March1st to 15thNight
25%30%25%16%2
900
16th to endNight
21%30%26%15%5%
960
April1st to 15thNight
22%28%28%17%3
898
16th to endNight
21%24%27%18%7%
891
May1st to 15thNight
23%22%24%22%6%
576
16th to endNight
18%19%20%30%9%
471
June1st to 15thNight
18%19%19%29%13%
425
16th to endNight
10%15%23%39%10%
420
July1st to 15thNight
10%13%16%41%18%
400
16th to endNight
11%16%16%36%17%2
440
August1st to 15thNight
12%9%17%36%22%2
631
16th to endNight
12%9%16%32%25%2
892
September1st to 15thNight
17%13%23%27%15%2
840
16th to endNight
14%11%19%27%22%5%
837
October1st to 15thNight
23%14%21%26%13%
840
16th to endNight
22%21%26%22%6%
896
November1st to 15thNight
19%25%22%22%8%1
880
16th to endNight
19%30%22%20%6%1
900
December1st to 15thNight
23%27%22%20%5%
900
16th to endNight
24%30%24%17%2
960
Page generated at 2020-06-04 03:18:52. Version ac04

Copyright 2020 A. Danko


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