Jonesport
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Jonesport clear sky chart from 2005-11-06 to 2024-01-13.

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
31%
23207
16%
74775
8%
23152
39%
23152
18%
51761

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
16%
792
14%
2715
4%
789
29%
789
12%
1884
January11th to 20thNight
16%
729
13%
2549
3%
729
28%
729
10%
1867
January21st to endNight
16%
792
17%
2653
4%
792
31%
792
15%
1798
February1st to 10thNight
15%
720
13%
2340
3%
720
26%
720
12%
1674
February11th to 20thNight
17%
702
15%
2236
4%
700
32%
700
13%
1565
February21st to endNight
19%
592
20%
1776
5%
592
36%
592
18%
1223
March1st to 10thNight
20%
720
19%
2102
6%
720
35%
720
19%
1471
March11th to 20thNight
26%
720
15%
1980
8%
720
34%
720
18%
1445
March21st to endNight
27%
792
21%
2178
8%
792
38%
792
22%
1506
April1st to 10thNight
23%
694
16%
1862
4%
694
31%
694
19%
1367
April11th to 20thNight
32%
534
18%
1598
9%
534
39%
534
20%
1114
April21st to endNight
30%
540
14%
1620
7%
540
36%
540
18%
1176
May1st to 10thNight
37%
540
15%
1620
9%
540
42%
540
19%
1164
May11th to 20thNight
36%
532
13%
1594
10%
532
40%
532
19%
1152
May21st to endNight
40%
519
12%
1500
10%
518
43%
518
20%
1085
June1st to 10thNight
38%
360
12%
1260
12%
360
43%
360
14%
936
June11th to 20thNight
45%
360
13%
1260
15%
360
49%
360
17%
879
June21st to endNight
42%
360
10%
1260
11%
360
45%
360
14%
929
July1st to 10thNight
44%
350
10%
1225
14%
350
45%
350
15%
881
July11th to 20thNight
45%
348
10%
1383
15%
348
47%
348
15%
950
July21st to endNight
48%
492
12%
1579
14%
465
49%
465
18%
1117
August1st to 10thNight
55%
538
11%
1600
10%
534
56%
534
21%
1124
August11th to 20thNight
49%
532
13%
1596
10%
532
51%
532
18%
1174
August21st to endNight
57%
594
20%
1782
15%
594
59%
594
26%
1169
September1st to 10thNight
57%
652
19%
1867
15%
652
60%
652
32%
1175
September11th to 20thNight
47%
720
21%
1980
15%
720
52%
720
31%
1272
September21st to endNight
44%
720
23%
1980
15%
720
50%
720
30%
1284
October1st to 10thNight
43%
720
21%
2074
12%
720
50%
720
26%
1362
October11th to 20thNight
36%
720
22%
2160
10%
720
47%
720
25%
1395
October21st to endNight
26%
792
16%
2518
8%
792
36%
792
19%
1721
November1st to 10thNight
31%
740
19%
2407
10%
740
41%
740
20%
1574
November11th to 20thNight
25%
818
21%
2593
9%
818
40%
818
18%
1723
November21st to endNight
22%
850
16%
2660
4%
850
36%
850
17%
1809
December1st to 10thNight
17%
850
13%
2664
3%
850
28%
850
14%
1969
December11th to 20thNight
15%
850
14%
3453
3%
849
29%
849
11%
2388
December21st to endNight
15%
923
10%
5151
2%
906
29%
906
8%
3439

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
20%8%35%5%3445%7%36%
74616
Night
21%9%36%5%3445%7%34%
75110
TransparencyDay
48%5%11%21%13%2
74322
Night
50%5%11%20%13%2
74939
SeeingDay
24%7%26%27%13%2
14941
Night
26%9%26%26%11%2
23220

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 10thDay
18%9%5%7%5%2445%7%33%
1447
11th to 20thDay
21%11%47%3235%5%6%32%
1456
21st to endDay
15%8%46%6%45%5%6%8%34%
1701
February1st to 10thDay
20%11%345%446%5%9%28%
1620
11th to 20thDay
16%11%36%6%35%5%5%9%32%
1613
21st to endDay
14%10%36%6%45%6%5%6%35%
1480
March1st to 10thDay
16%11%35%5%3445%7%35%
1854
11th to 20thDay
18%7%35%4245%5%7%40%
1980
21st to endDay
19%9%35%6%34346%39%
2178
April1st to 10thDay
21%9%46%5%345%5%6%33%
2095
11th to 20thDay
21%7%35%324447%39%
2312
21st to endDay
22%7%35%5%3445%6%35%
2340
May1st to 10thDay
23%8%37%5%3445%6%30%
2340
11th to 20thDay
22%7%24434446%40%
2301
21st to endDay
22%10%344345%6%8%32%
2786
June1st to 10thDay
24%8%46%5%3445%6%30%
2700
11th to 20thDay
21%9%35%5%34436%36%
2700
21st to endDay
28%10%36%5%24447%27%
2700
July1st to 10thDay
20%9%47%43446%8%31%
2700
11th to 20thDay
18%10%37%6%35%46%8%32%
2526
21st to endDay
17%9%36%446%6%7%7%32%
2625
August1st to 10thDay
16%7%26%5%45%5%5%8%36%
2327
11th to 20thDay
18%9%46%5%35%46%7%33%
2304
21st to endDay
15%7%335%3445%8%43%
2574
September1st to 10thDay
15%6%2442445%8%46%
2090
11th to 20thDay
16%7%24423446%48%
1980
21st to endDay
18%8%25%423446%43%
1980
October1st to 10thDay
16%8%244345%5%8%42%
1884
11th to 20thDay
19%6%25%5%345%5%8%41%
1800
21st to endDay
22%7%35%33335%6%38%
1836
November1st to 10thDay
19%7%36%43445%6%40%
1671
11th to 20thDay
21%5%25%32345%7%43%
1586
21st to endDay
21%9%245%23346%39%
1520
December1st to 10thDay
24%8%36%5%235%5%7%32%
1511
11th to 20thDay
26%9%36%5%35%346%29%
1668
21st to endDay
26%8%25%5%3335%6%34%
2431
January1st to 10thNight
19%10%47%6%345%5%8%30%
2715
11th to 20thNight
20%12%47%6%4445%7%27%
2549
21st to endNight
14%10%47%5%346%7%7%31%
2653
February1st to 10thNight
20%10%36%6%246%6%8%27%
2340
11th to 20thNight
18%10%46%5%35%36%7%34%
2233
21st to endNight
15%10%5%7%5%34447%36%
1776
March1st to 10thNight
15%11%37%5%3445%5%37%
2093
11th to 20thNight
19%9%47%6%35%5%5%6%32%
1979
21st to endNight
19%9%36%5%2345%6%39%
2178
April1st to 10thNight
25%10%35%5%3435%6%32%
1862
11th to 20thNight
22%9%35%4245%46%36%
1598
21st to endNight
27%8%35%5%3435%6%31%
1620
May1st to 10thNight
23%9%45%5%24446%33%
1620
11th to 20thNight
25%8%47%42346%5%31%
1593
21st to endNight
23%10%35%42435%7%32%
1499
June1st to 10thNight
29%9%35%5%3445%8%24%
1260
11th to 20thNight
24%10%26%424347%33%
1260
21st to endNight
30%9%36%433446%29%
1260
July1st to 10thNight
22%11%47%5%245%47%28%
1260
11th to 20thNight
23%10%47%425%35%8%30%
1430
21st to endNight
24%9%36%5%235%6%7%30%
1672
August1st to 10thNight
19%8%36%5%25%5%7%8%32%
1612
11th to 20thNight
21%10%46%6%36%5%5%6%30%
1596
21st to endNight
17%6%36%425%446%42%
1782
September1st to 10thNight
16%7%34324447%46%
1867
11th to 20thNight
18%8%3442245%6%46%
1980
21st to endNight
19%7%25%414446%45%
1980
October1st to 10thNight
19%5%25%43445%7%41%
2074
11th to 20thNight
20%5%245%335%47%42%
2160
21st to endNight
24%9%35%423346%38%
2518
November1st to 10thNight
20%7%345%2445%6%40%
2407
11th to 20thNight
19%7%25%5%3445%6%38%
2593
21st to endNight
20%7%35%4245%7%7%36%
2660
December1st to 10thNight
27%10%36%5%2445%8%28%
2664
11th to 20thNight
25%8%35%43445%6%33%
3531
21st to endNight
25%9%35%434446%33%
5236

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
53%313%19%12%1
1448
11th to 20thDay
55%5%13%18%7%2
1456
21st to endDay
49%413%20%13%1
1701
February1st to 10thDay
55%412%16%11%2
1620
11th to 20thDay
51%5%13%18%12%1
1621
21st to endDay
48%5%11%20%11%4
1480
March1st to 10thDay
50%5%10%19%14%3
1858
11th to 20thDay
43%5%10%21%16%4
1980
21st to endDay
47%49%17%17%5%
2178
April1st to 10thDay
51%49%17%16%3
2095
11th to 20thDay
45%5%10%23%14%3
2312
21st to endDay
48%6%9%17%16%3
2340
May1st to 10thDay
53%5%8%18%13%2
2340
11th to 20thDay
46%5%9%23%16%2
2305
21st to endDay
51%6%10%22%10%1
2786
June1st to 10thDay
54%5%11%20%9%1
2700
11th to 20thDay
51%5%9%18%15%2
2700
21st to endDay
58%5%9%16%11%2
2700
July1st to 10thDay
51%6%11%21%11%1
2625
11th to 20thDay
51%5%11%21%10%1
2450
21st to endDay
48%6%13%23%8%1
2478
August1st to 10thDay
45%7%11%26%9%1
2314
11th to 20thDay
50%5%12%21%11%
2304
21st to endDay
39%6%11%25%17%2
2574
September1st to 10thDay
37%5%13%26%18%2
2090
11th to 20thDay
38%410%26%19%3
1980
21st to endDay
43%48%28%16%1
1980
October1st to 10thDay
41%5%11%25%16%1
1884
11th to 20thDay
42%6%12%29%11%
1800
21st to endDay
48%412%22%14%1
1836
November1st to 10thDay
46%313%24%13%1
1671
11th to 20thDay
42%5%11%22%17%3
1586
21st to endDay
49%414%23%9%1
1520
December1st to 10thDay
53%5%13%19%10%
1511
11th to 20thDay
59%310%17%10%
1668
21st to endDay
52%6%12%18%10%2
2431
January1st to 10thNight
54%312%21%9%1
2715
11th to 20thNight
58%5%12%17%8%1
2549
21st to endNight
51%413%20%12%1
2653
February1st to 10thNight
55%5%13%15%10%2
2340
11th to 20thNight
52%5%10%18%14%2
2236
21st to endNight
49%5%9%20%15%3
1776
March1st to 10thNight
51%39%19%16%3
2102
11th to 20thNight
53%410%16%15%2
1980
21st to endNight
47%47%21%18%3
2178
April1st to 10thNight
53%5%8%14%17%4
1862
11th to 20thNight
50%48%21%15%2
1598
21st to endNight
55%48%16%14%3
1620
May1st to 10thNight
53%5%8%19%14%1
1620
11th to 20thNight
53%5%8%19%12%2
1594
21st to endNight
52%5%11%18%12%1
1500
June1st to 10thNight
58%5%8%20%7%2
1260
11th to 20thNight
52%5%9%19%12%2
1260
21st to endNight
59%5%7%19%9%2
1260
July1st to 10thNight
55%6%10%17%11%
1225
11th to 20thNight
53%5%12%18%11%1
1383
21st to endNight
52%6%13%19%9%1
1579
August1st to 10thNight
48%7%12%23%10%
1600
11th to 20thNight
55%5%11%20%9%
1596
21st to endNight
43%6%10%22%18%1
1782
September1st to 10thNight
39%411%29%16%1
1867
11th to 20thNight
40%49%26%19%2
1980
21st to endNight
41%47%27%19%1
1980
October1st to 10thNight
44%410%25%15%2
2074
11th to 20thNight
42%5%12%28%13%1
2160
21st to endNight
49%411%21%13%1
2518
November1st to 10thNight
46%412%23%15%1
2407
11th to 20thNight
47%411%20%16%2
2593
21st to endNight
47%5%14%19%13%2
2660
December1st to 10thNight
57%410%18%10%
2664
11th to 20thNight
52%5%11%20%12%1
3532
21st to endNight
53%5%12%17%9%3
5236

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
24%16%38%13%8%1
180
11th to 20thDay
27%12%33%21%5%1
164
21st to endDay
22%11%39%20%8%1
293
February1st to 10thDay
28%14%34%19%5%
340
11th to 20thDay
24%14%42%17%3
354
21st to endDay
19%15%36%24%6%
346
March1st to 10thDay
23%12%35%25%5%
420
11th to 20thDay
19%15%33%23%9%1
420
21st to endDay
24%10%31%25%8%2
462
April1st to 10thDay
28%10%34%21%5%2
420
11th to 20thDay
25%7%33%25%7%2
412
21st to endDay
25%6%30%27%10%1
420
May1st to 10thDay
26%7%29%28%9%1
423
11th to 20thDay
22%427%33%13%1
447
21st to endDay
30%223%27%15%2
662
June1st to 10thDay
26%422%31%15%2
630
11th to 20thDay
25%318%32%17%4
630
21st to endDay
34%314%30%17%2
630
July1st to 10thDay
26%414%34%19%3
620
11th to 20thDay
25%311%35%22%4
449
21st to endDay
22%217%33%23%3
488
August1st to 10thDay
17%218%33%26%4
446
11th to 20thDay
23%314%33%22%5%
439
21st to endDay
22%216%32%23%5%
495
September1st to 10thDay
17%318%36%24%2
450
11th to 20thDay
21%5%23%28%19%4
450
21st to endDay
20%325%30%18%4
450
October1st to 10thDay
19%6%23%31%17%3
401
11th to 20thDay
19%7%27%28%16%3
360
21st to endDay
28%7%29%26%9%1
396
November1st to 10thDay
21%11%31%24%11%2
365
11th to 20thDay
23%12%35%23%6%1
370
21st to endDay
26%14%33%20%6%1
370
December1st to 10thDay
26%9%39%21%41
361
11th to 20thDay
31%17%33%15%41
180
21st to endDay
30%16%30%17%6%1
198
January1st to 10thNight
25%17%34%19%5%
792
11th to 20thNight
28%15%33%19%4
729
21st to endNight
20%17%38%20%4
792
February1st to 10thNight
26%17%37%18%3
720
11th to 20thNight
22%21%34%20%31
703
21st to endNight
21%15%38%20%6%
592
March1st to 10thNight
22%13%40%23%2
720
11th to 20thNight
24%11%31%25%8%1
720
21st to endNight
24%9%33%25%8%1
792
April1st to 10thNight
30%8%33%22%6%
694
11th to 20thNight
28%428%30%9%
534
21st to endNight
31%425%24%13%3
540
May1st to 10thNight
28%223%32%12%3
540
11th to 20thNight
30%318%35%13%1
532
21st to endNight
29%219%32%15%3
519
June1st to 10thNight
32%215%31%17%2
360
11th to 20thNight
29%112%35%20%3
360
21st to endNight
34%28%37%17%2
360
July1st to 10thNight
29%310%34%23%1
350
11th to 20thNight
30%38%31%25%3
348
21st to endNight
29%28%31%28%3
492
August1st to 10thNight
23%39%37%25%4
538
11th to 20thNight
26%39%33%26%4
532
21st to endNight
20%29%36%27%5%
594
September1st to 10thNight
18%314%38%24%3
652
11th to 20thNight
23%219%29%21%5%
720
21st to endNight
22%322%31%17%6%
720
October1st to 10thNight
23%423%29%18%3
720
11th to 20thNight
22%8%28%26%13%3
720
21st to endNight
29%10%29%24%7%
792
November1st to 10thNight
25%9%29%25%11%1
740
11th to 20thNight
22%15%32%22%9%1
818
21st to endNight
23%17%32%20%8%1
850
December1st to 10thNight
33%10%35%18%5%
850
11th to 20thNight
26%21%33%16%3
850
21st to endNight
29%17%33%17%4
935
Page generated at 2024-01-10 01:25:06. Version ac07

Copyright 2024 Attilla Danko


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