Fort McKavett
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Fort McKavett clear sky chart from 2005-11-05 to 2017-04-26.

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
49%
15045
30%
45628
18%
15000
60%
15000
41%
24371

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
37%
897
30%
2327
12%
895
48%
895
40%
1367
January16th to endNight
35%
798
36%
2334
15%
798
53%
798
39%
1265
February1st to 15thNight
35%
704
31%
2108
13%
698
51%
698
39%
1127
February16th to endNight
25%
632
33%
1894
9%
632
45%
632
39%
1003
March1st to 15thNight
31%
642
30%
2082
13%
642
47%
642
35%
1138
March16th to endNight
28%
576
28%
2112
15%
576
48%
576
34%
1071
April1st to 15thNight
25%
539
28%
1874
10%
539
48%
539
36%
951
April16th to endNight
29%
528
31%
1752
13%
528
54%
528
41%
876
May1st to 15thNight
28%
494
27%
1485
13%
494
47%
494
35%
865
May16th to endNight
43%
514
24%
1540
16%
513
58%
513
40%
850
June1st to 15thNight
64%
495
25%
1485
22%
495
72%
495
55%
702
June16th to endNight
68%
495
22%
1485
23%
495
71%
495
44%
804
July1st to 15thNight
78%
465
24%
1395
26%
465
81%
465
46%
742
July16th to endNight
86%
522
28%
1476
33%
489
90%
489
58%
683
August1st to 15thNight
89%
494
30%
1639
38%
491
90%
491
52%
743
August16th to endNight
77%
525
24%
1750
28%
525
78%
525
35%
979
September1st to 15thNight
76%
495
24%
1793
28%
495
78%
495
32%
1001
September16th to endNight
72%
492
27%
1815
28%
492
75%
492
32%
981
October1st to 15thNight
62%
495
35%
1815
31%
495
70%
495
44%
847
October16th to endNight
56%
638
35%
2046
23%
638
66%
638
46%
994
November1st to 15thNight
52%
845
32%
2245
15%
845
60%
845
49%
1205
November16th to endNight
45%
900
33%
2340
14%
900
55%
900
45%
1303
December1st to 15thNight
43%
900
32%
2340
14%
900
53%
900
40%
1384
December16th to endNight
38%
960
30%
2496
12%
960
49%
960
38%
1490

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
8%424424447%53%
46021
Night
7%313323347%59%
45829
Cloud CoverDay
8%424424447%53%
46019
Night
6%313323347%59%
45829
TransparencyDay
30%5%10%20%21%11%
45721
Night
25%5%11%21%23%14%
45633
SeeingDay
9%5%24%35%20%4
4772
Night
8%6%33%37%14%1
15050

By Month

Percentage Cloud Cover SW (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
11%5%23322236%55%
1611
16th to endDay
10%423323335%58%
1899
February1st to 15thDay
7%5%12222435%61%
1750
16th to endDay
9%31321335%5%59%
1580
March1st to 15thDay
11%413413347%53%
1876
16th to endDay
9%42332333459%
2112
April1st to 15thDay
7%324423337%57%
2071
16th to endDay
8%434423336%55%
2116
May1st to 15thDay
12%5%35%5%34446%44%
2136
16th to endDay
9%435%32445%6%48%
2222
June1st to 15thDay
421342335%7%60%
2145
16th to endDay
7%3245%36%5%7%8%45%
2145
July1st to 15thDay
8%334435%5%6%9%45%
2145
16th to endDay
5%213436%5%6%10%48%
2273
August1st to 15thDay
221243445%8%58%
1980
16th to endDay
8%425%7%46%5%6%8%40%
2100
September1st to 15thDay
11%425%6%46%45%8%40%
1836
16th to endDay
9%4144335%5%6%50%
1815
October1st to 15thDay
7%323323336%58%
1815
16th to endDay
6%31222223468%
1815
November1st to 15thDay
7%413423347%58%
1611
16th to endDay
7%413212235%63%
1620
December1st to 15thDay
12%6%13213246%54%
1620
16th to endDay
9%6%2442335%5%52%
1728
January1st to 15thNight
11%5%23322235%58%
2327
16th to endNight
10%412313345%59%
2334
February1st to 15thNight
6%423312236%60%
2102
16th to endNight
8%31331336%5%59%
1894
March1st to 15thNight
10%41332345%6%55%
2082
16th to endNight
6%323323347%59%
2112
April1st to 15thNight
6%223313447%59%
1874
16th to endNight
4323223346%63%
1752
May1st to 15thNight
9%423423447%53%
1484
16th to endNight
6%11341435%9%56%
1539
June1st to 15thNight
11122234410%65%
1485
16th to endNight
321321445%9%58%
1485
July1st to 15thNight
5%21221345%10%58%
1485
16th to endNight
221131435%11%62%
1584
August1st to 15thNight
11222345%8%66%
1650
16th to endNight
5%4234246%7%9%49%
1750
September1st to 15thNight
7%3234245%5%9%50%
1793
16th to endNight
9%3133245%6%8%51%
1815
October1st to 15thNight
7%212212246%65%
1815
16th to endNight
6%31221323467%
2046
November1st to 15thNight
6%31231333466%
2245
16th to endNight
7%213322335%62%
2340
December1st to 15thNight
10%424313246%55%
2340
16th to endNight
8%5%24323346%55%
2496

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
11%423312236%56%
1611
16th to endDay
9%323223335%58%
1899
February1st to 15thDay
7%5%22222445%61%
1750
16th to endDay
8%422313445%59%
1580
March1st to 15thDay
11%41443436%54%
1876
16th to endDay
8%42322333459%
2110
April1st to 15thDay
7%323423346%57%
2071
16th to endDay
8%434423336%55%
2116
May1st to 15thDay
12%425%5%3345%6%45%
2136
16th to endDay
9%435%42445%5%49%
2222
June1st to 15thDay
4313323447%60%
2145
16th to endDay
7%325%5%35%5%6%9%45%
2145
July1st to 15thDay
7%424435%5%6%10%44%
2145
16th to endDay
5%214436%6%5%11%48%
2273
August1st to 15thDay
2112435%45%9%58%
1980
16th to endDay
8%426%6%45%47%10%40%
2100
September1st to 15thDay
11%5%25%7%445%5%8%40%
1836
16th to endDay
9%4144245%5%7%50%
1815
October1st to 15thDay
7%324333345%58%
1815
16th to endDay
6%312212235%68%
1815
November1st to 15thDay
7%413324346%58%
1611
16th to endDay
7%413312235%63%
1620
December1st to 15thDay
13%5%24213246%54%
1620
16th to endDay
10%5%24322445%53%
1728
January1st to 15thNight
10%6%23223235%58%
2327
16th to endNight
9%412213345%59%
2334
February1st to 15thNight
6%424322236%60%
2102
16th to endNight
8%31331335%5%60%
1894
March1st to 15thNight
10%31331335%6%55%
2082
16th to endNight
6%423323347%59%
2112
April1st to 15thNight
5%3123235%47%59%
1874
16th to endNight
4313313346%63%
1752
May1st to 15thNight
8%314333348%53%
1484
16th to endNight
6%21242345%9%56%
1539
June1st to 15thNight
111222245%9%66%
1485
16th to endNight
32122245%5%10%58%
1485
July1st to 15thNight
6%21231346%10%57%
1485
16th to endNight
21113234411%63%
1584
August1st to 15thNight
12231445%8%66%
1650
16th to endNight
5%3244246%8%9%49%
1750
September1st to 15thNight
6%4144245%5%10%50%
1793
16th to endNight
8%32342445%8%51%
1815
October1st to 15thNight
6%312212246%65%
1815
16th to endNight
5%313312335%66%
2046
November1st to 15thNight
6%313313235%66%
2245
16th to endNight
7%313222336%62%
2340
December1st to 15thNight
10%5%14313246%55%
2340
16th to endNight
8%5%24423346%55%
2496

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
32%2421%24%14%
1612
16th to endDay
29%26%12%30%17%
1899
February1st to 15thDay
26%36%17%24%22%
1751
16th to endDay
25%36%17%29%17%
1580
March1st to 15thDay
32%37%15%21%18%
1876
16th to endDay
29%38%19%23%15%
2112
April1st to 15thDay
29%47%17%21%19%
2071
16th to endDay
31%46%18%22%16%
2116
May1st to 15thDay
40%411%14%17%11%
2136
16th to endDay
35%6%10%18%21%7%
2226
June1st to 15thDay
23%5%12%25%25%7%
2145
16th to endDay
33%7%15%22%15%4
2145
July1st to 15thDay
32%8%15%25%14%2
2006
16th to endDay
26%8%19%31%13%1
2119
August1st to 15thDay
22%7%15%31%20%2
1967
16th to endDay
38%9%15%22%13%
2100
September1st to 15thDay
42%7%10%21%14%4
1836
16th to endDay
31%6%11%21%19%9%
1815
October1st to 15thDay
28%5%8%22%24%10%
1815
16th to endDay
20%35%15%33%21%
1815
November1st to 15thDay
26%49%24%21%14%
1611
16th to endDay
25%36%14%24%25%
1620
December1st to 15thDay
32%28%18%25%12%
1620
16th to endDay
32%37%17%28%10%
1728
January1st to 15thNight
30%25%16%25%19%
2327
16th to endNight
27%35%16%26%20%
2334
February1st to 15thNight
26%36%14%23%24%
2112
16th to endNight
24%46%16%27%20%
1894
March1st to 15thNight
29%48%15%23%18%
2082
16th to endNight
25%5%9%19%23%15%
2112
April1st to 15thNight
25%5%11%17%17%22%
1874
16th to endNight
24%311%22%22%16%
1752
May1st to 15thNight
30%6%10%21%20%10%
1485
16th to endNight
25%7%15%23%22%6%
1541
June1st to 15thNight
15%5%15%30%26%6%
1485
16th to endNight
22%7%16%27%20%5%
1485
July1st to 15thNight
21%7%18%31%18%2
1395
16th to endNight
12%6%26%35%17%2
1476
August1st to 15thNight
15%6%17%30%28%2
1639
16th to endNight
26%9%18%28%14%2
1750
September1st to 15thNight
28%9%15%23%18%4
1793
16th to endNight
29%6%13%21%17%11%
1815
October1st to 15thNight
22%312%25%23%12%
1815
16th to endNight
21%36%15%29%24%
2046
November1st to 15thNight
22%37%24%25%16%
2245
16th to endNight
25%38%14%24%24%
2340
December1st to 15thNight
31%37%18%24%15%
2340
16th to endNight
30%47%15%25%17%
2496

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
12%5%38%33%8%1
90
16th to endDay
10%11%41%29%7%
96
February1st to 15thDay
10%6%40%30%12%1
90
16th to endDay
9%6%45%34%3
81
March1st to 15thDay
16%442%25%11%
90
16th to endDay
18%46%30%9%4
96
April1st to 15thDay
7%18%46%25%1
190
16th to endDay
8%16%42%24%7%
259
May1st to 15thDay
15%11%42%24%4
393
16th to endDay
13%6%35%35%9%
437
June1st to 15thDay
5%221%51%16%2
420
16th to endDay
6%317%45%23%4
420
July1st to 15thDay
7%11%49%29%2
400
16th to endDay
31341%39%9%
434
August1st to 15thDay
35%36%41%12%
255
16th to endDay
11%18%34%35%7%
268
September1st to 15thDay
15%29%45%17%
111
16th to endDay
6%3322%45%18%
90
October1st to 15thDay
216%47%36%5%
90
16th to endDay
12%420%28%31%3
96
November1st to 15thDay
14%6%33%30%13%2
90
16th to endDay
23%12%33%20%8%2
90
December1st to 15thDay
23%5%21%28%17%3
90
16th to endDay
14%15%42%22%4
96
January1st to 15thNight
13%8%37%31%8%
900
16th to endNight
12%7%40%30%8%
798
February1st to 15thNight
8%10%42%31%6%
704
16th to endNight
10%12%50%24%2
632
March1st to 15thNight
12%7%47%26%5%
642
16th to endNight
5%11%52%27%3
576
April1st to 15thNight
6%11%55%23%2
539
16th to endNight
47%55%26%5%
528
May1st to 15thNight
9%10%49%24%5%
495
16th to endNight
4443%34%11%
515
June1st to 15thNight
1129%57%9%
495
16th to endNight
2125%50%19%1
495
July1st to 15thNight
7%10%55%25%1
465
16th to endNight
2461%28%2
522
August1st to 15thNight
1249%42%3
494
16th to endNight
5%7%46%34%4
525
September1st to 15thNight
6%7%45%35%4
495
16th to endNight
9%10%46%30%1
492
October1st to 15thNight
7%124%43%20%1
495
16th to endNight
8%428%38%17%1
638
November1st to 15thNight
8%431%38%15%1
845
16th to endNight
9%8%33%33%13%1
900
December1st to 15thNight
13%6%34%37%7%
900
16th to endNight
10%10%37%32%8%
960
Page generated at 2017-04-27 16:48:58. Version ac04

Copyright 2017 A. Danko


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