Medoc Mountain State Park
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Medoc Mountain State Park 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
42%
15511
22%
46614
13%
15475
51%
15475
27%
29208

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
28%
716
23%
2327
11%
716
43%
716
21%
1439
January16th to endNight
23%
768
24%
2496
10%
768
41%
768
23%
1537
February1st to 15thNight
22%
701
21%
2287
9%
701
40%
701
23%
1380
February16th to endNight
21%
631
28%
1872
11%
631
40%
631
27%
1114
March1st to 15thNight
30%
720
24%
1980
11%
720
43%
720
27%
1251
March16th to endNight
31%
768
21%
2112
11%
768
40%
768
27%
1375
April1st to 15thNight
33%
718
22%
1805
8%
718
43%
718
31%
1169
April16th to endNight
38%
720
21%
1800
8%
720
44%
720
33%
1168
May1st to 15thNight
39%
612
17%
1692
8%
612
45%
612
27%
1121
May16th to endNight
58%
522
17%
1644
13%
522
61%
522
29%
1019
June1st to 15thNight
58%
360
16%
1440
20%
360
61%
360
23%
873
June16th to endNight
65%
379
17%
1459
19%
379
68%
379
23%
883
July1st to 15thNight
65%
510
13%
1530
11%
510
67%
510
28%
993
July16th to endNight
68%
564
15%
1595
12%
531
71%
531
29%
1016
August1st to 15thNight
65%
533
17%
1581
13%
530
65%
530
26%
1039
August16th to endNight
64%
700
17%
1750
10%
700
65%
700
31%
1186
September1st to 15thNight
61%
660
25%
1650
18%
660
64%
660
33%
1084
September16th to endNight
44%
657
15%
1829
11%
657
48%
657
22%
1298
October1st to 15thNight
47%
660
27%
1980
23%
660
56%
660
28%
1255
October16th to endNight
43%
704
33%
2112
21%
704
60%
704
35%
1191
November1st to 15thNight
42%
700
26%
2104
16%
700
54%
700
31%
1250
November16th to endNight
41%
720
24%
2427
18%
720
52%
720
26%
1406
December1st to 15thNight
33%
720
21%
2520
12%
720
45%
720
22%
1529
December16th to endNight
29%
768
23%
2622
13%
768
43%
768
21%
1632

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%245%345%5%7%42%
47333
Night
13%5%2442445%7%44%
46808
Cloud CoverDay
13%5%245%345%5%8%42%
47343
Night
13%5%2442445%7%44%
46812
TransparencyDay
39%5%11%21%16%3
47044
Night
38%5%11%20%19%4
46615
SeeingDay
16%8%23%24%19%7%
5628
Night
16%8%26%30%15%1
15520

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
18%6%33333446%43%
1611
16th to endDay
17%6%23312346%47%
1728
February1st to 15thDay
16%6%14423447%44%
1575
16th to endDay
16%424423446%47%
1599
March1st to 15thDay
14%6%24223446%48%
1969
16th to endDay
18%5%25%424346%42%
2112
April1st to 15thDay
12%413424337%52%
2143
16th to endDay
14%5%25%5%34447%43%
2160
May1st to 15thDay
16%5%26%5%2445%7%37%
2268
16th to endDay
10%425%5%35%5%6%7%43%
2467
June1st to 15thDay
9%4246%47%6%6%10%38%
2520
16th to endDay
6%425%6%36%7%7%10%39%
2496
July1st to 15thDay
9%435%6%37%7%8%11%33%
2340
16th to endDay
6%425%6%46%7%8%11%34%
2465
August1st to 15thDay
10%5%26%6%45%6%8%9%34%
2269
16th to endDay
11%5%36%7%45%7%7%10%31%
2100
September1st to 15thDay
10%316%6%35%5%5%8%41%
1980
16th to endDay
21%7%26%5%25%446%33%
1799
October1st to 15thDay
18%6%23323345%46%
1650
16th to endDay
12%42332333455%
1760
November1st to 15thDay
14%414223346%51%
1752
16th to endDay
14%5%23433345%50%
1532
December1st to 15thDay
16%43432335%7%45%
1440
16th to endDay
19%7%25%323436%40%
1598
January1st to 15thNight
15%5%25%424346%44%
2327
16th to endNight
16%5%24324345%46%
2496
February1st to 15thNight
17%6%24323346%45%
2285
16th to endNight
12%5%1432345%6%48%
1872
March1st to 15thNight
14%423424437%48%
1968
16th to endNight
17%434424346%44%
2112
April1st to 15thNight
13%4245%23437%48%
1805
16th to endNight
13%324434447%46%
1800
May1st to 15thNight
15%6%25%42446%7%40%
1692
16th to endNight
11%4145%345%6%8%45%
1643
June1st to 15thNight
9%336%5%25%5%6%10%39%
1440
16th to endNight
7%5%15%5%45%6%7%9%40%
1459
July1st to 15thNight
7%325%6%46%6%8%12%36%
1620
16th to endNight
6%325%436%7%8%11%37%
1703
August1st to 15thNight
9%426%6%45%6%6%10%37%
1592
16th to endNight
10%5%25%5%345%7%12%36%
1750
September1st to 15thNight
11%43443435%9%45%
1650
16th to endNight
20%7%35%5%33446%35%
1829
October1st to 15thNight
16%5%25%413335%46%
1980
16th to endNight
13%313423345%55%
2112
November1st to 15thNight
13%424413345%50%
2104
16th to endNight
14%424433445%49%
2427
December1st to 15thNight
16%6%25%424346%43%
2520
16th to endNight
18%6%24423336%42%
2622

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
17%6%24324345%44%
1611
16th to endDay
17%6%24312346%47%
1728
February1st to 15thDay
15%5%25%423446%44%
1575
16th to endDay
15%42441345%6%47%
1599
March1st to 15thDay
13%6%13323446%48%
1980
16th to endDay
17%5%25%424446%42%
2111
April1st to 15thDay
12%422423347%52%
2143
16th to endDay
13%5%25%5%24447%43%
2160
May1st to 15thDay
16%6%26%5%3445%7%37%
2268
16th to endDay
10%5%25%436%5%6%8%42%
2467
June1st to 15thDay
9%4246%36%6%6%10%39%
2520
16th to endDay
6%415%6%37%7%7%10%39%
2496
July1st to 15thDay
8%5%35%6%36%8%7%11%32%
2340
16th to endDay
6%425%7%47%7%8%11%34%
2465
August1st to 15thDay
10%6%25%7%45%6%7%11%33%
2269
16th to endDay
10%6%36%6%46%6%7%10%31%
2100
September1st to 15thDay
10%325%6%35%5%6%8%41%
1980
16th to endDay
21%7%26%5%24447%33%
1799
October1st to 15thDay
18%6%23423345%46%
1650
16th to endDay
12%413323325%56%
1760
November1st to 15thDay
14%413314336%51%
1752
16th to endDay
13%5%13424345%51%
1532
December1st to 15thDay
16%5%24323348%45%
1440
16th to endDay
19%6%34423445%41%
1598
January1st to 15thNight
15%5%25%424337%44%
2327
16th to endNight
16%5%24424345%45%
2496
February1st to 15thNight
16%6%24323346%46%
2278
16th to endNight
12%5%2432435%6%49%
1872
March1st to 15thNight
14%5%23424436%48%
1980
16th to endNight
16%5%34424346%44%
2112
April1st to 15thNight
13%5%245%23347%48%
1805
16th to endNight
14%413435%447%46%
1800
May1st to 15thNight
15%6%25%4245%5%6%40%
1691
16th to endNight
12%3144345%5%8%45%
1643
June1st to 15thNight
9%336%5%35%48%10%39%
1440
16th to endNight
7%425%5%46%6%7%9%40%
1459
July1st to 15thNight
6%325%6%36%6%8%11%37%
1620
16th to endNight
7%425%436%7%9%11%37%
1703
August1st to 15thNight
9%426%6%35%5%7%10%37%
1592
16th to endNight
10%5%15%6%245%8%12%36%
1750
September1st to 15thNight
10%426%33345%9%45%
1650
16th to endNight
20%8%25%6%2345%6%35%
1829
October1st to 15thNight
16%5%25%422435%47%
1980
16th to endNight
12%313323345%55%
2112
November1st to 15thNight
13%424424345%50%
2104
16th to endNight
14%414433445%49%
2427
December1st to 15thNight
17%6%24423347%43%
2520
16th to endNight
18%6%25%423346%42%
2622

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
42%38%20%20%5%
1612
16th to endDay
39%27%24%18%7%
1728
February1st to 15thDay
40%26%23%21%4
1577
16th to endDay
37%311%22%21%4
1599
March1st to 15thDay
36%49%23%19%5%
1980
16th to endDay
43%49%21%15%5%
2112
April1st to 15thDay
32%310%27%19%7%
2143
16th to endDay
41%411%18%17%6%
2160
May1st to 15thDay
44%6%13%20%13%1
2268
16th to endDay
38%6%14%26%12%
2471
June1st to 15thDay
38%8%14%23%13%1
2520
16th to endDay
35%10%16%20%14%2
2496
July1st to 15thDay
40%10%16%18%10%2
2201
16th to endDay
39%9%17%20%11%1
2310
August1st to 15thDay
41%9%15%21%10%1
2256
16th to endDay
44%8%14%20%10%1
2100
September1st to 15thDay
38%8%13%17%17%3
1980
16th to endDay
51%39%17%16%2
1799
October1st to 15thDay
40%48%24%18%4
1650
16th to endDay
33%35%24%26%6%
1760
November1st to 15thDay
34%28%21%25%7%
1752
16th to endDay
36%39%21%24%5%
1532
December1st to 15thDay
38%310%24%17%5%
1440
16th to endDay
44%410%19%17%4
1598
January1st to 15thNight
41%39%17%22%5%
2327
16th to endNight
41%37%22%19%5%
2496
February1st to 15thNight
40%27%19%23%6%
2287
16th to endNight
35%38%24%21%5%
1872
March1st to 15thNight
37%49%22%19%6%
1980
16th to endNight
40%48%22%20%3
2112
April1st to 15thNight
36%48%21%21%6%
1805
16th to endNight
37%411%20%18%7%
1800
May1st to 15thNight
41%5%13%21%16%2
1692
16th to endNight
35%8%15%24%15%1
1645
June1st to 15thNight
37%8%16%19%15%2
1440
16th to endNight
36%10%14%18%16%3
1459
July1st to 15thNight
36%10%17%22%11%2
1530
16th to endNight
33%11%18%21%12%2
1595
August1st to 15thNight
40%7%17%19%12%1
1581
16th to endNight
37%8%18%24%10%1
1750
September1st to 15thNight
36%7%15%17%18%5%
1650
16th to endNight
49%5%9%14%18%2
1829
October1st to 15thNight
39%5%7%20%22%4
1980
16th to endNight
30%36%24%25%8%
2112
November1st to 15thNight
36%38%17%27%7%
2104
16th to endNight
37%37%19%24%8%
2427
December1st to 15thNight
41%49%20%20%4
2520
16th to endNight
43%310%20%17%4
2622

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
16%22%48%12%
90
16th to endDay
22%29%35%12%
96
February1st to 15thDay
23%28%34%11%2
90
16th to endDay
18%19%36%19%6%
222
March1st to 15thDay
17%20%30%23%7%1
270
16th to endDay
19%10%35%23%9%2
288
April1st to 15thDay
19%12%28%24%11%2
270
16th to endDay
18%5%27%30%14%3
270
May1st to 15thDay
19%9%35%19%12%3
288
16th to endDay
16%418%24%27%8%
331
June1st to 15thDay
11%319%31%23%10%
315
16th to endDay
8%320%30%29%6%
315
July1st to 15thDay
10%12%32%33%9%
305
16th to endDay
11%17%29%36%14%
326
August1st to 15thDay
13%114%27%25%16%
297
16th to endDay
12%110%21%33%21%
268
September1st to 15thDay
13%310%23%27%21%
255
16th to endDay
31%416%20%17%10%
254
October1st to 15thDay
24%5%22%20%19%7%
255
16th to endDay
11%9%26%27%20%5%
272
November1st to 15thDay
19%7%28%22%18%3
264
16th to endDay
18%14%23%25%15%3
152
December1st to 15thDay
16%18%40%15%6%3
60
16th to endDay
33%16%24%18%8%
75
January1st to 15thNight
18%15%31%26%6%
720
16th to endNight
20%13%38%25%2
768
February1st to 15thNight
22%16%36%23%2
704
16th to endNight
15%17%41%22%3
631
March1st to 15thNight
17%14%35%27%5%
720
16th to endNight
18%9%36%25%9%
768
April1st to 15thNight
16%12%35%28%6%
718
16th to endNight
16%7%33%31%10%
720
May1st to 15thNight
18%7%30%32%9%
612
16th to endNight
14%117%37%26%1
524
June1st to 15thNight
9%218%42%23%2
360
16th to endNight
7%214%46%25%2
379
July1st to 15thNight
8%113%42%30%3
510
16th to endNight
9%112%35%34%6%
564
August1st to 15thNight
12%19%39%33%3
533
16th to endNight
14%18%31%39%5%
700
September1st to 15thNight
14%113%32%35%3
660
16th to endNight
25%217%30%22%1
657
October1st to 15thNight
18%5%22%28%20%4
660
16th to endNight
15%8%30%25%18%1
704
November1st to 15thNight
15%7%29%30%14%2
700
16th to endNight
16%13%24%29%14%1
720
December1st to 15thNight
20%11%28%29%9%
720
16th to endNight
20%12%31%30%4
768
Page generated at 2017-08-13 14:16:15. Version ac04

Copyright 2017 A. Danko


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