Solomons Island
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Solomons Island 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
38%
15152
21%
46524
11%
15113
49%
15113
23%
29184

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
23%
719
22%
2429
9%
716
39%
716
18%
1508
January16th to endNight
22%
768
23%
2496
8%
768
40%
768
19%
1554
February1st to 15thNight
21%
701
21%
2277
8%
701
38%
701
21%
1370
February16th to endNight
23%
631
26%
1893
9%
631
44%
631
23%
1162
March1st to 15thNight
29%
720
21%
2031
10%
720
41%
720
24%
1307
March16th to endNight
31%
768
22%
2068
9%
768
42%
768
23%
1380
April1st to 15thNight
32%
718
19%
1796
6%
718
39%
718
28%
1180
April16th to endNight
41%
720
20%
1800
8%
720
45%
720
28%
1167
May1st to 15thNight
38%
597
17%
1677
9%
597
42%
597
22%
1134
May16th to endNight
50%
374
18%
1497
15%
374
57%
374
19%
878
June1st to 15thNight
53%
360
19%
1440
19%
360
60%
360
21%
845
June16th to endNight
55%
360
15%
1440
16%
360
61%
360
20%
867
July1st to 15thNight
57%
340
13%
1360
15%
340
60%
340
18%
845
July16th to endNight
61%
533
16%
1564
14%
500
68%
500
29%
933
August1st to 15thNight
60%
554
17%
1602
13%
551
61%
551
27%
1023
August16th to endNight
62%
700
17%
1750
9%
700
63%
700
31%
1164
September1st to 15thNight
59%
660
26%
1650
16%
660
62%
660
32%
1073
September16th to endNight
48%
657
20%
1795
12%
657
54%
657
24%
1194
October1st to 15thNight
43%
660
24%
1980
21%
660
50%
660
24%
1273
October16th to endNight
37%
704
28%
2112
15%
704
54%
704
26%
1269
November1st to 15thNight
33%
700
24%
2241
13%
700
48%
700
24%
1344
November16th to endNight
31%
720
23%
2418
13%
720
46%
720
20%
1467
December1st to 15thNight
26%
720
20%
2520
9%
720
42%
720
16%
1584
December16th to endNight
19%
768
22%
2688
8%
768
37%
768
16%
1663

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%2442445%8%44%
47442
Night
14%5%2442445%7%44%
46706
Cloud CoverDay
13%42442445%8%45%
47452
Night
14%5%2442445%7%44%
46710
TransparencyDay
36%6%13%24%16%2
47142
Night
39%5%11%23%17%3
46524
SeeingDay
15%11%17%28%20%6%
5613
Night
15%19%21%26%15%2
15157

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%2432435%7%42%
1507
16th to endDay
16%7%25%424346%42%
1728
February1st to 15thDay
13%7%26%335%436%43%
1585
16th to endDay
14%6%25%425%5%5%6%42%
1580
March1st to 15thDay
15%6%24424346%45%
1915
16th to endDay
17%7%24423445%43%
2155
April1st to 15thDay
12%42432345%7%48%
2152
16th to endDay
15%5%24423446%46%
2160
May1st to 15thDay
15%5%2432445%8%43%
2281
16th to endDay
12%41432446%10%44%
2618
June1st to 15thDay
10%323425%5%7%10%44%
2520
16th to endDay
7%3245%25%5%8%10%44%
2520
July1st to 15thDay
9%424435%5%7%10%42%
2520
16th to endDay
5%2246%35%7%8%10%41%
2495
August1st to 15thDay
10%5%25%5%3446%10%40%
2250
16th to endDay
10%424435%46%8%44%
2100
September1st to 15thDay
11%42442445%8%47%
1980
16th to endDay
15%7%25%425%45%7%38%
1834
October1st to 15thDay
17%423433346%46%
1650
16th to endDay
14%5%13423346%50%
1760
November1st to 15thDay
16%314324345%48%
1617
16th to endDay
14%5%2431335%5%48%
1539
December1st to 15thDay
14%5%25%42445%6%44%
1440
16th to endDay
18%6%25%423345%41%
1536
January1st to 15thNight
15%5%245%23446%44%
2429
16th to endNight
16%6%24323445%44%
2496
February1st to 15thNight
14%6%24323346%47%
2275
16th to endNight
14%6%34323346%47%
1893
March1st to 15thNight
15%424334446%46%
2019
16th to endNight
17%5%25%324347%42%
2068
April1st to 15thNight
13%5%24424436%46%
1796
16th to endNight
16%5%2331345%7%46%
1800
May1st to 15thNight
15%6%25%5%2445%8%39%
1677
16th to endNight
12%414435%45%9%43%
1495
June1st to 15thNight
10%5%23435%46%10%43%
1440
16th to endNight
8%4345%46%5%6%9%40%
1440
July1st to 15thNight
7%426%6%35%6%7%8%39%
1440
16th to endNight
6%3145%35%6%8%10%43%
1671
August1st to 15thNight
7%5%25%5%25%6%7%9%42%
1613
16th to endNight
10%5%35%5%25%5%5%8%43%
1750
September1st to 15thNight
12%5%15%434348%47%
1650
16th to endNight
16%6%25%424448%40%
1795
October1st to 15thNight
17%5%24423346%45%
1980
16th to endNight
15%413323345%51%
2112
November1st to 15thNight
15%5%24323335%50%
2241
16th to endNight
14%5%2442345%7%45%
2418
December1st to 15thNight
16%6%2442445%6%41%
2520
16th to endNight
17%6%345%22346%42%
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%5%3442345%6%42%
1507
16th to endDay
16%6%25%5%24346%42%
1728
February1st to 15thDay
13%8%15%425%447%42%
1585
16th to endDay
13%6%235%25%5%5%7%41%
1580
March1st to 15thDay
16%42442435%7%45%
1926
16th to endDay
18%5%24414346%43%
2154
April1st to 15thDay
12%424423347%48%
2152
16th to endDay
14%5%2443435%5%47%
2160
May1st to 15thDay
14%5%243245%5%8%43%
2281
16th to endDay
12%3144245%6%9%45%
2618
June1st to 15thDay
10%3133345%5%11%45%
2520
16th to endDay
7%323435%6%7%10%46%
2520
July1st to 15thDay
8%4245%345%6%10%43%
2520
16th to endDay
5%2145%45%7%8%10%43%
2495
August1st to 15thDay
9%6%25%5%3447%9%42%
2250
16th to endDay
10%415%5%35%45%8%46%
2100
September1st to 15thDay
11%42442435%9%46%
1980
16th to endDay
16%7%25%435%35%6%39%
1834
October1st to 15thDay
17%413423345%48%
1650
16th to endDay
14%41432335%6%50%
1760
November1st to 15thDay
17%413423437%48%
1617
16th to endDay
14%42431435%6%49%
1539
December1st to 15thDay
14%5%25%32445%6%44%
1440
16th to endDay
19%6%245%2434442%
1536
January1st to 15thNight
15%425%424446%43%
2429
16th to endNight
17%6%2432344445%
2496
February1st to 15thNight
14%6%23413346%47%
2268
16th to endNight
13%6%2432335%6%47%
1893
March1st to 15thNight
15%5%1432445%6%45%
2031
16th to endNight
17%6%24424437%42%
2068
April1st to 15thNight
13%5%245%24447%45%
1796
16th to endNight
16%5%2341345%7%45%
1800
May1st to 15thNight
14%6%26%43446%10%37%
1676
16th to endNight
12%4244345%6%8%44%
1495
June1st to 15thNight
10%413425%46%11%42%
1440
16th to endNight
7%5%25%5%36%6%6%9%41%
1440
July1st to 15thNight
8%436%6%36%5%7%9%39%
1440
16th to endNight
6%3245%36%6%8%10%42%
1671
August1st to 15thNight
7%5%25%5%25%6%6%9%42%
1613
16th to endNight
10%6%245%345%5%9%42%
1750
September1st to 15thNight
12%414433448%46%
1650
16th to endNight
16%6%2442445%7%40%
1795
October1st to 15thNight
17%324424346%45%
1980
16th to endNight
15%413324335%51%
2112
November1st to 15thNight
14%6%24323335%50%
2241
16th to endNight
14%5%2342435%7%45%
2418
December1st to 15thNight
16%6%3442445%6%41%
2520
16th to endNight
16%7%34423346%42%
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
41%413%21%15%3
1508
16th to endDay
42%311%24%15%3
1728
February1st to 15thDay
41%49%26%15%3
1587
16th to endDay
40%5%12%23%16%1
1580
March1st to 15thDay
38%5%12%23%16%3
1926
16th to endDay
42%311%21%17%3
2155
April1st to 15thDay
35%411%24%18%4
2152
16th to endDay
37%411%20%19%7%
2160
May1st to 15thDay
37%7%14%23%15%1
2281
16th to endDay
33%8%15%26%14%1
2622
June1st to 15thDay
31%7%16%28%13%1
2520
16th to endDay
30%8%16%24%17%1
2520
July1st to 15thDay
34%8%15%23%15%2
2371
16th to endDay
29%8%17%25%16%2
2339
August1st to 15thDay
35%6%14%26%15%1
2237
16th to endDay
34%6%14%23%17%3
2100
September1st to 15thDay
33%7%15%20%18%3
1980
16th to endDay
44%5%9%18%19%2
1834
October1st to 15thDay
38%49%27%16%3
1650
16th to endDay
35%49%26%20%3
1760
November1st to 15thDay
37%411%23%19%4
1617
16th to endDay
38%39%26%18%3
1539
December1st to 15thDay
40%413%24%13%3
1440
16th to endDay
44%311%24%14%1
1536
January1st to 15thNight
41%410%21%17%4
2429
16th to endNight
42%39%25%16%2
2496
February1st to 15thNight
38%39%26%18%3
2277
16th to endNight
38%39%25%20%2
1893
March1st to 15thNight
39%410%28%14%3
2031
16th to endNight
42%410%21%18%3
2068
April1st to 15thNight
38%410%21%21%3
1796
16th to endNight
37%410%22%18%6%
1800
May1st to 15thNight
42%6%12%21%14%2
1677
16th to endNight
36%7%15%23%15%1
1497
June1st to 15thNight
35%8%12%25%16%1
1440
16th to endNight
37%8%13%19%17%2
1440
July1st to 15thNight
40%9%15%19%12%3
1360
16th to endNight
30%9%17%26%14%
1564
August1st to 15thNight
36%8%14%22%18%
1602
16th to endNight
38%6%13%22%17%2
1750
September1st to 15thNight
36%6%13%20%19%4
1650
16th to endNight
42%6%9%18%20%3
1795
October1st to 15thNight
41%5%8%25%16%3
1980
16th to endNight
36%47%27%21%3
2112
November1st to 15thNight
38%38%23%20%6%
2241
16th to endNight
38%48%25%17%5%
2418
December1st to 15thNight
42%5%11%23%13%3
2520
16th to endNight
42%412%23%14%3
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
17%5%38%35%2
73
16th to endDay
17%10%35%31%5%
96
February1st to 15thDay
23%12%18%41%2
101
16th to endDay
14%18%32%28%5%
239
March1st to 15thDay
17%16%28%30%7%
270
16th to endDay
19%16%27%27%7%2
288
April1st to 15thDay
13%14%25%30%14%1
270
16th to endDay
17%14%16%25%22%2
270
May1st to 15thDay
23%12%24%26%11%2
288
16th to endDay
17%11%9%26%26%8%
331
June1st to 15thDay
13%11%13%25%25%11%
315
16th to endDay
6%11%11%40%26%5%
315
July1st to 15thDay
11%6%8%32%33%7%
305
16th to endDay
6%9%7%27%35%12%
326
August1st to 15thDay
11%7%9%28%35%7%
297
16th to endDay
10%6%425%36%17%
268
September1st to 15thDay
12%8%12%23%24%19%
255
16th to endDay
27%8%12%20%20%10%
254
October1st to 15thDay
20%8%14%30%19%6%
255
16th to endDay
12%11%28%27%16%3
272
November1st to 15thDay
18%14%23%19%19%3
242
16th to endDay
13%22%23%27%10%3
159
December1st to 15thDay
18%10%26%25%16%3
60
16th to endDay
35%325%31%4
64
January1st to 15thNight
15%26%30%20%7%
720
16th to endNight
17%23%32%23%2
768
February1st to 15thNight
14%25%32%24%2
704
16th to endNight
15%25%31%24%2
631
March1st to 15thNight
17%22%28%25%6%
720
16th to endNight
18%21%25%24%8%1
768
April1st to 15thNight
14%19%29%28%7%
718
16th to endNight
16%19%18%30%13%1
720
May1st to 15thNight
14%19%21%30%13%1
597
16th to endNight
13%18%12%26%25%4
375
June1st to 15thNight
11%18%12%26%27%3
360
16th to endNight
6%18%12%34%27%1
360
July1st to 15thNight
8%13%7%34%31%4
340
16th to endNight
6%17%6%30%31%6%
533
August1st to 15thNight
11%11%5%38%30%3
554
16th to endNight
11%10%6%30%33%7%
700
September1st to 15thNight
12%10%10%26%34%5%
660
16th to endNight
20%10%12%27%26%3
657
October1st to 15thNight
19%13%15%27%20%3
660
16th to endNight
17%16%25%23%14%1
704
November1st to 15thNight
15%20%24%21%14%3
700
16th to endNight
14%26%23%22%10%1
720
December1st to 15thNight
18%24%25%18%11%1
720
16th to endNight
18%25%32%19%4
768
Page generated at 2017-08-13 14:16:53. Version ac04

Copyright 2017 A. Danko


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