Hartman Creek State Park
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Hartman Creek State Park clear sky chart from 2005-11-05 to 2017-09-17.

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
36%
16084
16%
46844
9%
16041
43%
16041
23%
31610

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
24%
900
13%
2506
4%
895
32%
895
17%
1839
January16th to endNight
20%
960
12%
2670
3%
960
28%
960
15%
2040
February1st to 15thNight
25%
872
14%
2283
3%
871
32%
871
21%
1617
February16th to endNight
26%
631
16%
1893
6%
631
35%
631
16%
1356
March1st to 15thNight
32%
720
15%
2160
8%
720
37%
720
20%
1455
March16th to endNight
35%
582
17%
2000
15%
582
42%
582
19%
1354
April1st to 15thNight
29%
539
15%
1797
10%
539
37%
539
19%
1234
April16th to endNight
36%
540
18%
1734
12%
540
45%
540
21%
1178
May1st to 15thNight
30%
540
15%
1482
8%
540
37%
540
22%
1066
May16th to endNight
45%
562
14%
1498
7%
561
50%
561
30%
990
June1st to 15thNight
48%
540
12%
1440
6%
540
51%
540
29%
946
June16th to endNight
51%
540
15%
1440
7%
540
54%
540
34%
912
July1st to 15thNight
62%
510
17%
1360
9%
510
65%
510
44%
778
July16th to endNight
63%
564
20%
1417
12%
531
66%
531
45%
819
August1st to 15thNight
67%
539
22%
1482
17%
536
70%
536
38%
893
August16th to endNight
57%
573
20%
1910
20%
573
62%
573
30%
1128
September1st to 15thNight
59%
540
24%
1800
23%
540
65%
540
34%
1004
September16th to endNight
50%
635
20%
1807
14%
635
55%
635
32%
1104
October1st to 15thNight
42%
660
23%
1955
15%
660
49%
660
28%
1218
October16th to endNight
33%
704
15%
2233
8%
704
41%
704
19%
1527
November1st to 15thNight
33%
700
21%
2276
14%
700
42%
700
24%
1422
November16th to endNight
27%
873
14%
2493
6%
873
34%
873
18%
1773
December1st to 15thNight
20%
900
11%
2520
3%
900
27%
900
17%
1849
December16th to endNight
17%
960
12%
2688
3%
960
25%
960
13%
2108

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%7%36%5%35%45%7%37%
47942
Night
13%7%35%5%2445%6%40%
47011
Cloud CoverDay
13%7%36%5%35%45%7%36%
47950
Night
13%8%35%5%2445%6%40%
47016
TransparencyDay
46%7%13%22%10%
47627
Night
43%6%13%22%12%1
46844
SeeingDay
15%7%28%27%15%4
6086
Night
17%7%31%30%11%1
16087

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
12%11%6%8%6%35%445%31%
1432
16th to endDay
11%14%6%11%7%44346%24%
1551
February1st to 15thDay
11%12%47%5%25%46%5%33%
1579
16th to endDay
12%11%47%5%35%5%5%6%32%
1580
March1st to 15thDay
13%10%46%5%25%45%6%35%
1793
16th to endDay
17%10%46%42435%7%34%
2229
April1st to 15thDay
16%10%46%5%35%445%32%
2151
16th to endDay
21%9%36%5%24335%33%
2226
May1st to 15thDay
19%6%26%6%35%5%5%6%32%
2466
16th to endDay
12%425%5%35%5%6%6%40%
2617
June1st to 15thDay
15%5%245%25%45%9%38%
2520
16th to endDay
10%5%26%5%25%5%6%8%39%
2520
July1st to 15thDay
6%325%5%45%6%7%9%44%
2520
16th to endDay
9%425%5%35%6%6%8%43%
2655
August1st to 15thDay
8%3346%36%6%6%8%42%
2467
16th to endDay
14%5%25%42435%7%44%
2292
September1st to 15thDay
12%415%5%2345%7%46%
2160
16th to endDay
11%6%27%5%3445%7%40%
1847
October1st to 15thDay
16%7%245%2435%6%41%
1674
16th to endDay
17%8%37%6%24346%34%
1639
November1st to 15thDay
13%7%36%5%3435%6%39%
1582
16th to endDay
15%9%47%5%34447%33%
1466
December1st to 15thDay
16%10%47%5%2445%6%30%
1440
16th to endDay
20%14%5%8%6%45%445%19%
1536
January1st to 15thNight
14%10%5%7%6%34345%34%
2506
16th to endNight
11%11%5%8%7%35%5%47%27%
2670
February1st to 15thNight
10%10%5%7%5%34445%38%
2280
16th to endNight
14%11%36%5%345%45%34%
1893
March1st to 15thNight
13%7%35%5%3345%6%40%
2147
16th to endNight
16%9%35%425%45%5%37%
2000
April1st to 15thNight
21%6%36%423446%36%
1797
16th to endNight
20%6%24424446%38%
1734
May1st to 15thNight
20%7%245%25%35%5%36%
1482
16th to endNight
10%5%26%425%5%6%8%43%
1496
June1st to 15thNight
11%4346%3445%7%44%
1440
16th to endNight
8%4244245%7%8%47%
1440
July1st to 15thNight
6%22332345%9%55%
1440
16th to endNight
6%31341346%8%54%
1513
August1st to 15thNight
7%415%3345%5%7%52%
1491
16th to endNight
11%5%1342445%7%49%
1910
September1st to 15thNight
10%413324447%53%
1800
16th to endNight
11%414434446%49%
1807
October1st to 15thNight
13%5%24423347%47%
1955
16th to endNight
16%7%25%5%34446%37%
2233
November1st to 15thNight
14%6%34423337%45%
2276
16th to endNight
16%7%36%5%3445%8%33%
2493
December1st to 15thNight
15%13%46%42345%6%32%
2520
16th to endNight
20%13%5%7%5%24345%26%
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
12%10%6%9%5%45%445%31%
1432
16th to endDay
11%15%5%11%8%34446%24%
1551
February1st to 15thDay
11%12%48%6%25%45%6%32%
1579
16th to endDay
12%11%47%5%25%5%5%7%32%
1580
March1st to 15thDay
13%10%5%6%5%34446%34%
1803
16th to endDay
17%9%36%425%35%6%34%
2227
April1st to 15thDay
16%11%47%5%3445%5%32%
2151
16th to endDay
20%9%36%6%24335%33%
2226
May1st to 15thDay
19%6%26%6%35%5%5%6%32%
2466
16th to endDay
12%425%5%35%5%6%7%40%
2617
June1st to 15thDay
14%5%25%5%35%5%6%8%37%
2520
16th to endDay
9%5%26%5%36%5%6%9%38%
2520
July1st to 15thDay
5%3245%46%6%7%9%43%
2520
16th to endDay
8%425%5%36%6%5%9%42%
2655
August1st to 15thDay
8%325%6%36%6%7%9%41%
2467
16th to endDay
13%5%25%43445%7%43%
2292
September1st to 15thDay
11%5%25%43345%7%46%
2160
16th to endDay
10%6%37%6%3446%7%40%
1847
October1st to 15thDay
16%7%25%5%23447%40%
1674
16th to endDay
16%9%37%6%24346%34%
1639
November1st to 15thDay
13%7%36%6%3345%5%39%
1582
16th to endDay
16%8%47%6%34447%33%
1466
December1st to 15thDay
16%10%48%43445%6%31%
1440
16th to endDay
20%14%49%7%35%345%19%
1536
January1st to 15thNight
14%10%47%6%34345%33%
2506
16th to endNight
11%11%5%9%6%45%5%5%6%27%
2670
February1st to 15thNight
11%10%5%7%434445%38%
2273
16th to endNight
14%11%46%6%445%35%34%
1893
March1st to 15thNight
14%7%35%5%35%346%40%
2160
16th to endNight
16%8%45%42445%5%37%
2000
April1st to 15thNight
20%7%26%5%23446%36%
1797
16th to endNight
19%7%34434446%38%
1734
May1st to 15thNight
20%7%25%5%2445%6%35%
1481
16th to endNight
11%425%4245%6%9%43%
1496
June1st to 15thNight
10%435%5%345%5%8%43%
1440
16th to endNight
7%5%2442447%9%46%
1440
July1st to 15thNight
5%32232346%8%55%
1440
16th to endNight
5%31342346%9%54%
1513
August1st to 15thNight
7%4145%245%5%7%52%
1491
16th to endNight
11%42332435%7%49%
1910
September1st to 15thNight
9%41332345%7%53%
1800
16th to endNight
10%425%4335%47%48%
1807
October1st to 15thNight
13%5%34323347%47%
1955
16th to endNight
15%8%26%5%35%446%37%
2233
November1st to 15thNight
14%6%34423347%44%
2276
16th to endNight
16%8%36%5%3445%7%33%
2493
December1st to 15thNight
15%13%47%42345%6%32%
2520
16th to endNight
19%14%5%7%5%24346%26%
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
54%6%12%18%8%
1433
16th to endDay
61%5%12%14%5%
1551
February1st to 15thDay
52%6%13%19%7%1
1580
16th to endDay
50%7%12%20%8%
1580
March1st to 15thDay
49%6%15%18%8%1
1803
16th to endDay
49%6%15%22%6%1
2229
April1st to 15thDay
53%6%10%18%10%
2151
16th to endDay
53%5%10%19%9%1
2226
May1st to 15thDay
51%7%13%20%7%
2466
16th to endDay
40%9%11%23%13%2
2621
June1st to 15thDay
42%7%14%25%10%
2520
16th to endDay
39%8%15%23%12%
2520
July1st to 15thDay
34%8%15%26%13%2
2371
16th to endDay
37%8%14%21%15%2
2488
August1st to 15thDay
35%9%15%26%11%1
2452
16th to endDay
38%7%15%24%13%1
2292
September1st to 15thDay
36%6%12%29%14%
2160
16th to endDay
40%7%15%26%9%
1847
October1st to 15thDay
43%5%12%26%11%
1674
16th to endDay
50%6%14%20%7%
1639
November1st to 15thDay
45%412%24%11%1
1582
16th to endDay
51%6%15%20%6%
1466
December1st to 15thDay
54%5%14%19%6%
1440
16th to endDay
66%6%9%11%5%
1536
January1st to 15thNight
52%6%11%19%9%
2506
16th to endNight
56%6%12%16%7%
2670
February1st to 15thNight
47%5%12%22%9%1
2283
16th to endNight
51%6%12%20%7%1
1893
March1st to 15thNight
44%6%13%21%12%2
2160
16th to endNight
48%5%12%24%8%1
2000
April1st to 15thNight
49%5%8%20%13%1
1797
16th to endNight
46%5%11%20%13%2
1734
May1st to 15thNight
48%6%13%19%12%
1482
16th to endNight
37%7%14%23%14%1
1498
June1st to 15thNight
37%7%13%26%13%
1440
16th to endNight
32%8%14%25%15%2
1440
July1st to 15thNight
24%6%14%30%20%2
1360
16th to endNight
25%6%17%31%16%3
1417
August1st to 15thNight
29%7%14%29%16%1
1482
16th to endNight
33%7%13%26%16%2
1910
September1st to 15thNight
30%5%11%28%22%
1800
16th to endNight
34%6%13%32%11%
1807
October1st to 15thNight
37%5%10%29%14%1
1955
16th to endNight
46%6%14%20%11%
2233
November1st to 15thNight
40%5%13%23%14%1
2276
16th to endNight
48%6%17%19%7%
2493
December1st to 15thNight
52%5%15%18%6%
2520
16th to endNight
60%6%12%15%5%
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
24%8%34%23%8%
90
16th to endDay
21%332%33%9%
96
February1st to 15thDay
17%13%41%21%6%
90
16th to endDay
19%13%41%16%7%1
81
March1st to 15thDay
24%11%32%23%6%2
90
16th to endDay
31%5%25%22%12%2
213
April1st to 15thDay
24%10%27%26%10%
270
16th to endDay
23%9%30%21%11%2
270
May1st to 15thDay
22%11%31%24%7%2
423
16th to endDay
15%8%31%27%11%5%
517
June1st to 15thDay
13%8%28%30%15%3
495
16th to endDay
9%9%33%27%15%4
495
July1st to 15thDay
7%5%23%33%20%9%
475
16th to endDay
8%428%29%21%7%
515
August1st to 15thDay
9%322%30%25%7%
484
16th to endDay
16%418%27%24%8%
332
September1st to 15thDay
13%220%28%23%11%
315
16th to endDay
11%6%24%32%20%3
259
October1st to 15thDay
17%11%24%25%17%3
114
16th to endDay
20%8%38%26%6%
96
November1st to 15thDay
313%33%31%14%4
90
16th to endDay
30%11%37%14%6%
90
December1st to 15thDay
15%21%45%13%31
90
16th to endDay
38%14%37%6%3
96
January1st to 15thNight
19%11%35%27%6%1
900
16th to endNight
16%9%41%26%5%
960
February1st to 15thNight
16%8%39%28%5%
874
16th to endNight
20%10%35%26%8%
631
March1st to 15thNight
17%9%33%26%11%
720
16th to endNight
18%8%31%30%9%1
582
April1st to 15thNight
23%7%37%25%6%
539
16th to endNight
22%6%30%32%6%
540
May1st to 15thNight
25%6%34%27%6%
540
16th to endNight
13%5%29%38%12%
563
June1st to 15thNight
12%428%40%13%
540
16th to endNight
11%329%41%13%1
540
July1st to 15thNight
7%321%43%22%1
510
16th to endNight
6%23%44%23%1
564
August1st to 15thNight
8%214%46%24%2
539
16th to endNight
11%122%36%23%3
573
September1st to 15thNight
11%223%33%22%6%
540
16th to endNight
12%5%25%32%22%1
635
October1st to 15thNight
16%8%27%30%15%1
660
16th to endNight
20%10%31%26%9%
704
November1st to 15thNight
18%8%37%24%10%1
700
16th to endNight
20%12%32%25%7%
873
December1st to 15thNight
22%10%38%22%5%
900
16th to endNight
27%8%36%22%4
960
Page generated at 2017-09-18 07:38:23. Version ac04

Copyright 2017 A. Danko


Hartman Creek State Park Clear Sky Chart | Charts Home