Baker Creek State Park
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Baker Creek State Park clear sky chart from 2005-11-05 to 2019-06-02.

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
43%
17984
23%
53822
13%
17941
53%
17941
24%
33603

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
26%
840
23%
2717
9%
836
43%
836
17%
1693
January16th to endNight
26%
896
25%
2912
12%
896
43%
896
21%
1781
February1st to 15thNight
29%
824
25%
2520
11%
821
44%
821
22%
1548
February16th to endNight
25%
735
24%
2205
9%
735
41%
735
21%
1376
March1st to 15thNight
27%
840
25%
2324
9%
840
40%
840
25%
1462
March16th to endNight
32%
896
21%
2464
10%
896
41%
896
23%
1573
April1st to 15thNight
35%
838
25%
2306
12%
838
46%
838
29%
1369
April16th to endNight
43%
669
26%
1923
13%
669
54%
669
28%
1149
May1st to 15thNight
46%
629
20%
1890
11%
629
53%
629
27%
1155
May16th to endNight
52%
657
19%
1971
11%
657
57%
657
22%
1266
June1st to 15thNight
59%
588
16%
1765
13%
588
61%
588
24%
1162
June16th to endNight
61%
585
15%
1755
10%
585
64%
585
26%
1129
July1st to 15thNight
62%
555
12%
1665
9%
555
64%
555
21%
1136
July16th to endNight
62%
612
13%
1739
10%
579
67%
579
24%
1163
August1st to 15thNight
65%
575
16%
1715
14%
572
66%
572
22%
1172
August16th to endNight
59%
680
15%
2026
11%
680
62%
680
22%
1377
September1st to 15thNight
61%
780
17%
2145
14%
780
63%
780
26%
1435
September16th to endNight
51%
777
22%
2145
14%
777
58%
777
26%
1418
October1st to 15thNight
52%
780
30%
2229
25%
780
58%
780
33%
1316
October16th to endNight
50%
832
34%
2496
24%
832
65%
832
36%
1371
November1st to 15thNight
43%
820
30%
2538
21%
820
55%
820
30%
1440
November16th to endNight
39%
840
27%
2730
16%
840
55%
840
27%
1550
December1st to 15thNight
33%
840
25%
2730
14%
840
47%
840
20%
1670
December16th to endNight
25%
896
22%
2912
10%
896
40%
896
16%
1892

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
12%4245%35%45%7%43%
54503
Night
12%5%2442445%7%45%
54021
TransparencyDay
39%6%10%20%18%5%
54204
Night
37%5%10%19%19%6%
53824
SeeingDay
16%11%19%22%20%9%
7781
Night
13%18%18%26%19%3
17987

By Month

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
18%6%24424245%45%
1881
16th to endDay
16%5%24223345%48%
2016
February1st to 15thDay
17%6%1432446%6%43%
1997
16th to endDay
19%5%23323346%44%
1840
March1st to 15thDay
16%324424335%48%
2295
16th to endDay
15%315%434346%45%
2463
April1st to 15thDay
11%4244345%46%48%
2302
16th to endDay
10%42343435%7%49%
2651
May1st to 15thDay
10%424425%5%6%8%46%
2721
16th to endDay
11%5%145%35%5%6%7%41%
2847
June1st to 15thDay
9%425%6%46%6%6%9%38%
2548
16th to endDay
5%3245%45%6%7%11%43%
2535
July1st to 15thDay
8%5%26%6%5%7%7%7%10%33%
2535
16th to endDay
7%426%7%47%8%8%11%31%
2673
August1st to 15thDay
10%5%36%6%46%6%8%9%32%
2487
16th to endDay
11%5%36%6%47%7%6%9%31%
2509
September1st to 15thDay
10%426%6%35%6%6%8%39%
2145
16th to endDay
15%6%15%424447%42%
2145
October1st to 15thDay
14%5%13313345%53%
2061
16th to endDay
11%31342323359%
2080
November1st to 15thDay
14%6%13313336%51%
1976
16th to endDay
14%323424346%50%
1890
December1st to 15thDay
17%7%245%23345%41%
1890
16th to endDay
23%5%2442345%6%37%
2016
January1st to 15thNight
14%5%34424445%45%
2717
16th to endNight
17%6%2432334448%
2912
February1st to 15thNight
16%4144235%46%46%
2512
16th to endNight
16%5%24424445%47%
2205
March1st to 15thNight
13%5%24424446%48%
2324
16th to endNight
12%425%424446%46%
2464
April1st to 15thNight
12%314423348%51%
2306
16th to endNight
8%41443345%7%50%
1923
May1st to 15thNight
8%424425%5%6%8%45%
1889
16th to endNight
8%5%245%36%6%6%9%42%
1970
June1st to 15thNight
8%425%5%46%6%7%11%36%
1765
16th to endNight
5%424448%6%9%11%39%
1755
July1st to 15thNight
8%426%6%37%7%8%10%33%
1755
16th to endNight
6%425%6%46%6%7%14%34%
1847
August1st to 15thNight
9%4146%36%7%9%14%30%
1726
16th to endNight
10%5%15%6%36%6%7%10%35%
2026
September1st to 15thNight
10%425%6%35%5%7%9%38%
2145
16th to endNight
13%7%145%3335%6%44%
2145
October1st to 15thNight
10%5%24323345%54%
2229
16th to endNight
9%313423335%58%
2496
November1st to 15thNight
12%5%23313336%54%
2538
16th to endNight
13%313424435%52%
2730
December1st to 15thNight
17%5%24422445%45%
2730
16th to endNight
20%6%25%413346%40%
2912

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%47%17%23%4
1882
16th to endDay
38%36%19%23%7%
2016
February1st to 15thDay
41%37%20%21%5%
1999
16th to endDay
41%36%21%20%6%
1840
March1st to 15thDay
38%37%20%19%9%
2295
16th to endDay
40%410%21%18%4
2464
April1st to 15thDay
35%410%20%22%6%
2302
16th to endDay
34%5%10%20%22%6%
2651
May1st to 15thDay
35%6%13%21%19%3
2721
16th to endDay
39%7%11%23%15%2
2851
June1st to 15thDay
40%8%15%22%12%1
2548
16th to endDay
31%10%16%24%13%2
2535
July1st to 15thDay
42%10%16%18%8%3
2396
16th to endDay
40%11%17%19%8%2
2518
August1st to 15thDay
45%10%13%19%9%2
2474
16th to endDay
47%10%15%15%10%1
2509
September1st to 15thDay
41%8%14%16%16%3
2145
16th to endDay
42%5%9%20%17%4
2145
October1st to 15thDay
34%39%21%23%6%
2061
16th to endDay
30%2420%29%11%
2080
November1st to 15thDay
35%37%17%26%9%
1976
16th to endDay
34%47%19%24%8%
1890
December1st to 15thDay
44%38%18%17%6%
1890
16th to endDay
47%5%8%17%15%6%
2016
January1st to 15thNight
41%36%15%25%6%
2717
16th to endNight
40%3418%22%10%
2912
February1st to 15thNight
38%48%18%21%8%
2521
16th to endNight
39%37%18%22%7%
2205
March1st to 15thNight
37%49%16%22%9%
2324
16th to endNight
38%5%10%17%22%6%
2464
April1st to 15thNight
32%39%24%22%7%
2306
16th to endNight
31%6%9%20%21%10%
1923
May1st to 15thNight
34%6%15%21%17%4
1890
16th to endNight
36%9%12%22%16%2
1972
June1st to 15thNight
38%8%16%23%10%1
1765
16th to endNight
35%10%17%21%12%3
1755
July1st to 15thNight
41%11%19%16%9%3
1665
16th to endNight
37%11%21%18%8%2
1739
August1st to 15thNight
40%12%17%20%9%
1715
16th to endNight
41%10%18%18%10%
2026
September1st to 15thNight
38%9%15%15%15%4
2145
16th to endNight
40%6%11%19%17%5%
2145
October1st to 15thNight
32%410%19%24%7%
2229
16th to endNight
29%35%18%30%12%
2496
November1st to 15thNight
31%46%18%26%12%
2538
16th to endNight
33%36%17%26%11%
2730
December1st to 15thNight
39%49%19%20%6%
2730
16th to endNight
45%38%18%17%5%
2912

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
26%11%35%21%6%
180
16th to endDay
16%21%37%18%41
192
February1st to 15thDay
24%16%40%15%2
180
16th to endDay
29%13%33%22%1
159
March1st to 15thDay
19%22%27%25%5%
375
16th to endDay
18%17%33%19%10%
416
April1st to 15thDay
18%16%24%24%14%2
390
16th to endDay
13%12%22%27%18%4
379
May1st to 15thDay
10%13%24%26%18%6%
408
16th to endDay
17%11%13%22%20%14%
459
June1st to 15thDay
10%9%7%22%31%17%
379
16th to endDay
8%8%14%24%25%18%
375
July1st to 15thDay
10%6%7%20%35%20%
365
16th to endDay
7%8%6%23%36%17%
390
August1st to 15thDay
16%5%9%22%30%16%
358
16th to endDay
12%5%9%21%31%20%
396
September1st to 15thDay
12%5%12%22%28%18%
375
16th to endDay
20%5%12%23%25%13%
374
October1st to 15thDay
18%7%16%26%17%13%
375
16th to endDay
13%10%23%24%23%6%
400
November1st to 15thDay
26%11%20%20%17%3
304
16th to endDay
9%11%30%28%17%3
180
December1st to 15thDay
30%12%31%19%6%
180
16th to endDay
31%12%36%13%41
192
January1st to 15thNight
18%28%22%23%7%
840
16th to endNight
16%27%26%25%4
896
February1st to 15thNight
18%24%25%26%5%
824
16th to endNight
16%25%29%24%4
735
March1st to 15thNight
15%24%30%24%5%
840
16th to endNight
14%24%24%25%10%
896
April1st to 15thNight
14%21%24%26%12%
838
16th to endNight
10%20%20%29%17%1
669
May1st to 15thNight
10%17%20%32%18%1
630
16th to endNight
12%16%10%28%26%5%
659
June1st to 15thNight
7%15%7%28%31%9%
588
16th to endNight
5%15%9%27%30%11%
585
July1st to 15thNight
7%11%5%28%35%10%
555
16th to endNight
5%15%7%22%40%8%
612
August1st to 15thNight
10%9%5%27%39%8%
575
16th to endNight
11%8%9%24%37%7%
680
September1st to 15thNight
10%8%8%26%37%7%
780
16th to endNight
17%9%13%25%27%6%
777
October1st to 15thNight
14%11%16%27%22%7%
780
16th to endNight
9%13%21%30%23%2
832
November1st to 15thNight
15%16%19%26%19%2
820
16th to endNight
13%22%21%25%15%1
840
December1st to 15thNight
18%22%20%25%12%1
840
16th to endNight
22%23%23%24%5%
896
Page generated at 2019-06-02 19:43:08. Version ac04

Copyright 2019 A. Danko


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