Middletown
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Middletown clear sky chart from 2005-11-05 to 2017-08-12.

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
39%
15060
20%
46538
11%
15021
49%
15021
25%
29286

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
22%
717
20%
2415
8%
716
37%
716
18%
1538
January16th to endNight
20%
768
21%
2496
7%
768
38%
768
21%
1582
February1st to 15thNight
24%
703
19%
2287
6%
701
41%
701
20%
1401
February16th to endNight
18%
631
21%
1937
6%
631
36%
631
19%
1244
March1st to 15thNight
26%
720
21%
1992
9%
720
39%
720
24%
1300
March16th to endNight
24%
768
21%
2097
8%
768
35%
768
23%
1408
April1st to 15thNight
28%
718
18%
1796
5%
718
35%
718
27%
1211
April16th to endNight
40%
720
19%
1800
7%
720
46%
720
30%
1216
May1st to 15thNight
39%
537
18%
1617
10%
537
45%
537
23%
1093
May16th to endNight
50%
374
18%
1497
16%
374
57%
374
21%
896
June1st to 15thNight
55%
360
19%
1440
20%
360
62%
360
25%
829
June16th to endNight
59%
360
18%
1440
18%
360
66%
360
26%
817
July1st to 15thNight
58%
340
12%
1360
15%
340
61%
340
18%
871
July16th to endNight
72%
554
16%
1585
13%
521
76%
521
36%
921
August1st to 15thNight
68%
527
18%
1575
14%
524
70%
524
31%
975
August16th to endNight
64%
674
19%
1724
12%
674
65%
674
33%
1124
September1st to 15thNight
59%
660
25%
1650
14%
660
63%
660
36%
1059
September16th to endNight
52%
657
23%
1818
18%
657
56%
657
28%
1202
October1st to 15thNight
46%
660
24%
1980
19%
660
55%
660
26%
1274
October16th to endNight
37%
704
27%
2112
15%
704
53%
704
33%
1220
November1st to 15thNight
37%
700
25%
2215
16%
700
50%
700
29%
1307
November16th to endNight
32%
720
20%
2497
12%
720
45%
720
21%
1497
December1st to 15thNight
27%
720
17%
2520
7%
720
40%
720
18%
1622
December16th to endNight
23%
768
20%
2688
7%
768
39%
768
20%
1679

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%5%25%5%345%5%7%40%
47429
Night
14%5%2442445%7%42%
46720
Cloud CoverDay
14%5%25%5%35%5%5%7%40%
47439
Night
14%5%2442445%7%42%
46724
TransparencyDay
40%5%12%22%15%2
47129
Night
39%5%12%23%16%2
46538
SeeingDay
17%9%22%24%18%7%
5486
Night
17%9%28%30%13%1
15065

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
15%6%25%426%5%6%6%37%
1522
16th to endDay
14%8%245%2445%7%39%
1728
February1st to 15thDay
13%8%36%5%345%5%6%37%
1575
16th to endDay
12%7%36%6%3445%6%39%
1536
March1st to 15thDay
14%6%25%5%34336%42%
1957
16th to endDay
17%7%25%5%34446%38%
2126
April1st to 15thDay
15%5%25%425%45%7%40%
2152
16th to endDay
17%5%345%24336%42%
2160
May1st to 15thDay
17%6%25%4245%6%8%34%
2343
16th to endDay
16%5%25%5%25%45%8%38%
2618
June1st to 15thDay
12%323435%6%7%9%41%
2520
16th to endDay
9%4245%35%5%6%9%42%
2520
July1st to 15thDay
9%5%25%6%36%6%6%8%38%
2520
16th to endDay
7%4245%47%7%7%11%37%
2473
August1st to 15thDay
10%5%26%6%46%6%7%8%36%
2288
16th to endDay
11%5%245%246%6%8%42%
2113
September1st to 15thDay
15%41442335%7%45%
1980
16th to endDay
16%425%5%3445%6%40%
1810
October1st to 15thDay
20%314324346%45%
1650
16th to endDay
14%335%42445%5%45%
1760
November1st to 15thDay
13%6%2432335%6%46%
1641
16th to endDay
18%5%245%2345%7%40%
1461
December1st to 15thDay
16%6%25%5%3446%7%36%
1440
16th to endDay
17%6%25%5%25%45%5%38%
1536
January1st to 15thNight
17%6%35%43446%6%38%
2415
16th to endNight
15%7%25%425%447%39%
2496
February1st to 15thNight
13%6%25%42445%6%43%
2285
16th to endNight
13%7%25%5%35%5%46%39%
1937
March1st to 15thNight
16%6%23435%45%7%41%
1980
16th to endNight
15%5%35%42435%6%41%
2097
April1st to 15thNight
13%6%35%5%35%45%7%39%
1796
16th to endNight
15%5%2443446%7%42%
1800
May1st to 15thNight
18%6%24425%45%7%37%
1617
16th to endNight
12%5%25%5%345%6%7%43%
1495
June1st to 15thNight
10%4244245%8%9%44%
1440
16th to endNight
8%415%435%46%10%44%
1440
July1st to 15thNight
9%5%246%36%6%7%8%37%
1440
16th to endNight
6%324325%6%7%11%45%
1692
August1st to 15thNight
9%4145%25%6%6%9%43%
1586
16th to endNight
10%4245%345%5%8%46%
1724
September1st to 15thNight
12%41442445%9%46%
1650
16th to endNight
16%425%424436%44%
1818
October1st to 15thNight
18%5%24324346%43%
1980
16th to endNight
14%41331335%6%51%
2112
November1st to 15thNight
13%6%24422345%50%
2215
16th to endNight
16%42432445%8%41%
2497
December1st to 15thNight
16%5%35%5%26%5%5%5%37%
2520
16th to endNight
16%5%25%43345%8%38%
2688

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
15%7%24425%46%6%38%
1522
16th to endDay
14%7%435%3445%6%40%
1728
February1st to 15thDay
12%8%35%6%445%5%6%38%
1575
16th to endDay
12%6%46%6%2425%7%39%
1536
March1st to 15thDay
14%7%345%35%446%41%
1968
16th to endDay
17%6%25%6%24446%38%
2125
April1st to 15thDay
14%435%5%24448%41%
2152
16th to endDay
18%5%25%424336%42%
2160
May1st to 15thDay
17%5%344246%6%7%35%
2343
16th to endDay
15%5%25%5%3445%8%38%
2618
June1st to 15thDay
12%324435%6%7%9%41%
2520
16th to endDay
10%325%435%5%6%10%42%
2520
July1st to 15thDay
8%425%6%36%6%6%8%38%
2520
16th to endDay
7%3245%48%6%7%11%37%
2473
August1st to 15thDay
10%5%26%6%36%6%7%8%36%
2288
16th to endDay
10%5%25%5%345%6%8%42%
2113
September1st to 15thDay
14%4145%23447%46%
1980
16th to endDay
16%5%25%5%3445%7%39%
1810
October1st to 15thDay
19%413334336%45%
1650
16th to endDay
14%4245%2445%5%46%
1760
November1st to 15thDay
13%6%1442445%6%47%
1641
16th to endDay
18%42442345%6%41%
1461
December1st to 15thDay
16%5%25%5%35%5%5%7%36%
1440
16th to endDay
17%5%25%6%35%45%6%37%
1536
January1st to 15thNight
17%6%25%43345%7%39%
2415
16th to endNight
15%7%25%5%2445%6%40%
2496
February1st to 15thNight
13%5%35%4245%5%6%44%
2278
16th to endNight
12%7%26%5%35%5%5%6%40%
1937
March1st to 15thNight
16%5%24425%446%42%
1992
16th to endNight
15%6%35%42435%6%41%
2097
April1st to 15thNight
13%5%36%5%35%45%7%39%
1796
16th to endNight
16%5%23425%45%8%42%
1800
May1st to 15thNight
18%7%35%415%45%7%37%
1616
16th to endNight
12%5%244345%5%7%42%
1495
June1st to 15thNight
10%4244245%7%9%44%
1440
16th to endNight
8%324435%5%6%11%43%
1440
July1st to 15thNight
9%5%25%5%46%6%8%9%36%
1440
16th to endNight
6%314325%6%7%12%45%
1692
August1st to 15thNight
9%424435%5%7%8%43%
1586
16th to endNight
10%4145%345%5%8%45%
1724
September1st to 15thNight
12%42443445%8%46%
1650
16th to endNight
15%5%25%424436%44%
1818
October1st to 15thNight
18%424333445%44%
1980
16th to endNight
14%41332335%6%52%
2112
November1st to 15thNight
13%6%24422435%50%
2215
16th to endNight
16%425%32445%7%42%
2497
December1st to 15thNight
16%5%26%5%25%6%5%6%37%
2520
16th to endNight
16%6%25%42445%8%38%
2688

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
43%5%13%23%12%2
1523
16th to endDay
43%314%23%11%2
1728
February1st to 15thDay
45%412%23%11%1
1577
16th to endDay
45%312%25%11%1
1536
March1st to 15thDay
42%412%23%14%2
1968
16th to endDay
46%411%19%15%2
2126
April1st to 15thDay
41%411%21%17%3
2152
16th to endDay
42%48%19%20%5%
2160
May1st to 15thDay
44%7%13%19%14%1
2343
16th to endDay
43%6%14%22%12%1
2622
June1st to 15thDay
35%8%15%25%14%
2520
16th to endDay
35%7%15%23%15%1
2520
July1st to 15thDay
39%9%13%21%13%3
2371
16th to endDay
35%8%15%23%15%2
2317
August1st to 15thDay
41%8%13%20%15%1
2275
16th to endDay
37%6%12%26%14%2
2113
September1st to 15thDay
36%6%12%19%22%2
1980
16th to endDay
43%47%23%19%2
1810
October1st to 15thDay
39%410%24%17%2
1650
16th to endDay
37%311%26%19%1
1760
November1st to 15thDay
37%313%21%17%5%
1641
16th to endDay
41%411%26%14%1
1461
December1st to 15thDay
44%417%21%10%1
1440
16th to endDay
45%6%12%23%11%
1536
January1st to 15thNight
43%412%21%14%3
2415
16th to endNight
42%413%25%13%1
2496
February1st to 15thNight
39%413%24%14%2
2287
16th to endNight
41%411%25%14%1
1937
March1st to 15thNight
41%412%27%12%1
1992
16th to endNight
43%410%22%16%2
2097
April1st to 15thNight
41%411%21%16%3
1796
16th to endNight
39%5%9%21%17%6%
1800
May1st to 15thNight
44%6%10%22%14%2
1617
16th to endNight
38%8%15%21%15%2
1497
June1st to 15thNight
34%8%12%27%16%1
1440
16th to endNight
33%8%13%24%17%2
1440
July1st to 15thNight
41%10%13%17%12%4
1360
16th to endNight
27%9%19%23%17%2
1585
August1st to 15thNight
34%7%14%22%18%2
1575
16th to endNight
35%7%11%22%19%3
1724
September1st to 15thNight
34%5%14%20%22%3
1650
16th to endNight
41%5%7%21%20%3
1818
October1st to 15thNight
41%5%8%24%17%2
1980
16th to endNight
32%39%31%21%1
2112
November1st to 15thNight
36%38%24%19%7%
2215
16th to endNight
38%412%23%17%3
2497
December1st to 15thNight
45%5%13%23%11%1
2520
16th to endNight
43%416%23%11%1
2688

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
24%34%21%12%6%1
75
16th to endDay
27%30%30%10%2
96
February1st to 15thDay
23%30%36%8%1
90
16th to endDay
19%17%41%19%2
195
March1st to 15thDay
17%20%27%26%6%
270
16th to endDay
20%12%34%23%6%2
288
April1st to 15thDay
17%16%26%24%12%2
270
16th to endDay
25%5%27%16%18%6%
270
May1st to 15thDay
25%17%19%18%12%5%
288
16th to endDay
20%418%24%23%8%
331
June1st to 15thDay
15%5%24%23%23%8%
315
16th to endDay
12%425%29%21%6%
315
July1st to 15thDay
15%220%27%26%7%
305
16th to endDay
7%210%34%30%14%
326
August1st to 15thDay
12%215%24%30%13%
297
16th to endDay
10%18%27%26%25%
268
September1st to 15thDay
14%5%13%16%30%19%
255
16th to endDay
24%116%25%19%11%
254
October1st to 15thDay
22%5%13%30%21%7%
255
16th to endDay
13%13%26%30%14%1
272
November1st to 15thDay
16%9%28%22%20%2
246
16th to endDay
25%19%20%20%8%3
81
December1st to 15thDay
18%33%21%13%10%3
60
16th to endDay
29%12%35%18%3
64
January1st to 15thNight
21%15%36%22%4
720
16th to endNight
20%15%39%23%1
768
February1st to 15thNight
18%17%34%27%2
704
16th to endNight
19%19%36%21%2
631
March1st to 15thNight
21%13%34%26%4
720
16th to endNight
18%15%36%23%5%1
768
April1st to 15thNight
16%14%38%26%4
718
16th to endNight
18%8%29%31%11%
720
May1st to 15thNight
21%5%26%33%11%
537
16th to endNight
16%421%36%20%1
375
June1st to 15thNight
10%322%36%24%1
360
16th to endNight
9%220%47%18%1
360
July1st to 15thNight
12%118%41%25%1
340
16th to endNight
7%111%43%33%3
554
August1st to 15thNight
11%10%48%26%3
527
16th to endNight
12%212%38%29%4
674
September1st to 15thNight
14%118%32%30%2
660
16th to endNight
17%219%31%27%1
657
October1st to 15thNight
20%5%23%28%19%2
660
16th to endNight
16%10%32%29%9%
704
November1st to 15thNight
14%8%34%30%11%1
700
16th to endNight
18%15%28%27%9%
720
December1st to 15thNight
20%10%34%26%6%
720
16th to endNight
20%11%39%26%2
768
Page generated at 2017-08-13 14:16:52. Version ac04

Copyright 2017 A. Danko


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