Baxter State Park
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Baxter State Park clear sky chart from 2005-11-05 to 2017-09-18.

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
24%
14729
12%
46822
6%
14697
31%
14697
14%
34079

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
13%
727
9%
2547
3%
723
21%
723
7%
1936
January16th to endNight
11%
768
10%
2688
1%
768
22%
768
9%
2000
February1st to 15thNight
12%
704
8%
2310
3%
701
19%
701
8%
1799
February16th to endNight
12%
631
12%
1901
1%
631
24%
631
10%
1460
March1st to 15thNight
16%
720
14%
2102
6%
720
25%
720
12%
1575
March16th to endNight
23%
768
14%
2108
5%
768
30%
768
15%
1542
April1st to 15thNight
18%
665
15%
1743
4%
665
26%
665
14%
1311
April16th to endNight
23%
540
16%
1620
8%
540
30%
540
16%
1168
May1st to 15thNight
25%
540
11%
1620
6%
540
30%
540
15%
1197
May16th to endNight
23%
402
9%
1410
7%
401
30%
401
11%
1072
June1st to 15thNight
30%
360
7%
1260
5%
360
34%
360
12%
953
June16th to endNight
38%
360
7%
1260
8%
360
40%
360
17%
878
July1st to 15thNight
40%
340
9%
1240
9%
340
44%
340
18%
844
July16th to endNight
42%
376
10%
1418
11%
354
46%
354
18%
899
August1st to 15thNight
44%
509
10%
1580
8%
507
47%
507
21%
1073
August16th to endNight
45%
573
20%
1719
12%
573
51%
573
29%
1057
September1st to 15thNight
39%
712
13%
1900
6%
712
43%
712
27%
1263
September16th to endNight
40%
669
21%
1847
12%
669
47%
669
28%
1189
October1st to 15thNight
30%
660
18%
1903
8%
660
39%
660
20%
1305
October16th to endNight
19%
704
11%
2260
4%
704
28%
704
12%
1677
November1st to 15thNight
22%
701
15%
2280
8%
701
31%
701
13%
1658
November16th to endNight
21%
750
12%
2526
6%
750
29%
750
12%
1813
December1st to 15thNight
13%
750
7%
2700
2%
750
19%
750
7%
2120
December16th to endNight
9%
800
9%
2880
2%
800
17%
800
5%
2290

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
18%11%47%6%34445%26%
47984
Night
16%11%48%6%35%445%28%
46986
TransparencyDay
55%6%11%16%8%
47666
Night
52%7%12%18%8%
46822
SeeingDay
23%18%29%17%8%1
6436
Night
21%18%28%22%7%
14729

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
11%13%6%12%9%5%45%4420%
1388
16th to endDay
10%12%6%12%9%45%5%4422%
1536
February1st to 15thDay
11%14%6%11%11%5%7%5%4417%
1550
16th to endDay
10%16%8%11%9%4445%420%
1572
March1st to 15thDay
16%16%6%9%6%3433426%
1847
16th to endDay
15%15%5%9%7%3443426%
2115
April1st to 15thDay
18%15%5%7%6%3333426%
2206
16th to endDay
21%12%36%423345%30%
2340
May1st to 15thDay
22%11%46%5%24446%26%
2332
16th to endDay
22%10%37%6%35%45%6%23%
2714
June1st to 15thDay
27%11%46%5%2435%6%21%
2700
16th to endDay
23%9%46%6%35%45%5%23%
2700
July1st to 15thDay
16%7%36%6%46%5%6%7%28%
2643
16th to endDay
18%7%37%7%36%5%5%7%26%
2654
August1st to 15thDay
19%9%26%5%46%6%5%6%25%
2358
16th to endDay
14%7%36%5%35%45%7%34%
2483
September1st to 15thDay
17%9%35%433345%39%
2058
16th to endDay
16%7%25%433446%41%
1838
October1st to 15thDay
17%11%5%7%6%23337%30%
1727
16th to endDay
21%14%5%9%6%33335%23%
1609
November1st to 15thDay
18%15%46%6%24336%28%
1576
16th to endDay
17%12%410%7%25%445%23%
1434
December1st to 15thDay
19%16%6%11%7%3434318%
1260
16th to endDay
19%16%7%10%7%34435%17%
1344
January1st to 15thNight
12%12%6%12%10%36%5%4421%
2547
16th to endNight
10%12%6%10%9%5%6%6%6%5%20%
2688
February1st to 15thNight
9%13%7%10%10%5%7%6%5%5%18%
2309
16th to endNight
14%16%6%9%7%4434425%
1901
March1st to 15thNight
16%13%49%6%3443429%
2089
16th to endNight
13%12%6%8%7%34435%30%
2108
April1st to 15thNight
18%13%47%6%24445%28%
1743
16th to endNight
21%10%36%6%24345%31%
1620
May1st to 15thNight
23%9%47%5%24346%27%
1620
16th to endNight
22%9%37%6%45%44427%
1408
June1st to 15thNight
25%9%47%425%436%25%
1260
16th to endNight
15%9%46%4445%6%6%32%
1260
July1st to 15thNight
14%7%36%5%345%6%8%33%
1314
16th to endNight
14%6%36%435%46%7%36%
1514
August1st to 15thNight
14%8%36%5%25%46%6%36%
1590
16th to endNight
10%6%2442445%8%45%
1719
September1st to 15thNight
15%7%25%43445%7%40%
1900
16th to endNight
11%7%35%5%13346%46%
1847
October1st to 15thNight
16%8%36%5%2445%6%35%
1903
16th to endNight
20%14%38%5%24445%26%
2260
November1st to 15thNight
18%10%47%6%34445%29%
2280
16th to endNight
15%12%5%8%9%34445%27%
2526
December1st to 15thNight
18%15%5%11%7%45%44418%
2700
16th to endNight
19%14%7%11%8%35%44416%
2880

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
58%8%12%13%6%
1389
16th to endDay
57%8%9%15%8%
1536
February1st to 15thDay
62%8%9%13%5%
1553
16th to endDay
61%8%7%12%9%1
1572
March1st to 15thDay
60%48%13%11%1
1857
16th to endDay
56%6%8%15%10%2
2115
April1st to 15thDay
59%38%15%11%2
2206
16th to endDay
55%48%17%10%3
2340
May1st to 15thDay
57%5%10%16%10%1
2332
16th to endDay
58%7%10%15%6%
2718
June1st to 15thDay
61%5%11%14%5%1
2700
16th to endDay
58%7%11%15%7%
2700
July1st to 15thDay
49%8%14%19%7%
2488
16th to endDay
54%8%12%18%6%
2487
August1st to 15thDay
53%8%15%17%5%
2344
16th to endDay
44%8%16%23%8%
2483
September1st to 15thDay
45%6%13%21%12%
2058
16th to endDay
42%5%10%28%12%
1838
October1st to 15thDay
53%411%20%9%
1727
16th to endDay
60%5%11%15%6%
1609
November1st to 15thDay
56%7%11%13%10%
1576
16th to endDay
56%9%13%14%5%
1434
December1st to 15thDay
64%8%9%12%4
1260
16th to endDay
64%6%9%11%7%
1344
January1st to 15thNight
57%8%14%12%5%
2547
16th to endNight
54%9%12%16%6%
2688
February1st to 15thNight
58%9%11%14%5%1
2310
16th to endNight
58%6%9%14%9%1
1901
March1st to 15thNight
55%6%8%18%9%2
2102
16th to endNight
51%6%11%17%10%2
2108
April1st to 15thNight
54%5%7%15%13%2
1743
16th to endNight
52%47%16%14%3
1620
May1st to 15thNight
56%410%16%10%
1620
16th to endNight
58%8%9%16%6%
1410
June1st to 15thNight
59%5%10%17%5%1
1260
16th to endNight
48%8%15%18%8%
1260
July1st to 15thNight
45%9%15%20%7%
1240
16th to endNight
44%6%18%20%10%
1418
August1st to 15thNight
44%8%18%23%5%
1580
16th to endNight
35%7%17%32%7%
1719
September1st to 15thNight
39%7%14%27%10%
1900
16th to endNight
38%5%13%28%13%
1847
October1st to 15thNight
45%6%11%24%11%
1903
16th to endNight
54%7%13%17%6%
2260
November1st to 15thNight
51%8%12%16%8%1
2280
16th to endNight
52%7%16%15%7%
2526
December1st to 15thNight
60%9%11%14%3
2700
16th to endNight
63%7%10%10%6%
2880

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
21%35%35%8%
60
16th to endDay
17%23%45%9%4
64
February1st to 15thDay
18%22%35%18%5%
211
16th to endDay
18%30%31%14%4
238
March1st to 15thDay
25%28%26%14%5%
270
16th to endDay
23%22%26%17%8%2
288
April1st to 15thDay
28%22%27%13%5%2
270
16th to endDay
24%27%26%13%5%3
270
May1st to 15thDay
33%17%29%14%31
288
16th to endDay
24%21%30%18%3
445
June1st to 15thDay
31%14%27%17%9%
495
16th to endDay
24%12%32%19%10%1
495
July1st to 15thDay
16%12%31%22%14%1
422
16th to endDay
18%7%36%26%10%
326
August1st to 15thDay
20%11%28%25%11%2
313
16th to endDay
16%14%27%24%14%3
332
September1st to 15thDay
18%12%31%22%10%5%
315
16th to endDay
18%14%27%18%11%8%
262
October1st to 15thDay
17%19%28%16%11%5%
239
16th to endDay
29%25%25%12%5%1
240
November1st to 15thDay
23%20%27%18%9%
235
16th to endDay
26%24%27%11%9%
234
December1st to 15thDay
26%31%30%8%3
60
16th to endDay
31%39%26%3
64
January1st to 15thNight
19%28%32%17%2
727
16th to endNight
20%26%33%15%4
768
February1st to 15thNight
15%26%35%18%3
704
16th to endNight
24%24%31%15%3
631
March1st to 15thNight
25%21%32%17%2
720
16th to endNight
18%21%29%22%8%
768
April1st to 15thNight
24%24%26%18%6%
665
16th to endNight
28%17%25%21%7%
540
May1st to 15thNight
26%14%27%24%6%
540
16th to endNight
25%11%29%26%7%
402
June1st to 15thNight
27%9%25%27%11%
360
16th to endNight
21%7%25%32%12%
360
July1st to 15thNight
17%7%29%31%13%1
340
16th to endNight
14%5%27%36%15%
376
August1st to 15thNight
18%6%20%35%19%
509
16th to endNight
13%6%27%34%16%1
573
September1st to 15thNight
16%12%25%31%12%1
712
16th to endNight
15%11%28%29%14%1
669
October1st to 15thNight
22%13%27%23%10%1
660
16th to endNight
26%21%27%18%5%
704
November1st to 15thNight
21%19%29%20%8%
701
16th to endNight
21%24%25%18%8%1
750
December1st to 15thNight
25%24%31%15%2
750
16th to endNight
30%25%26%14%2
800
Page generated at 2017-09-19 07:32:31. Version ac04

Copyright 2017 A. Danko


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