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 2018-08-29.

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%
17376
16%
50586
9%
17333
43%
17333
23%
34053

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%
975
14%
2716
5%
970
32%
970
18%
1970
January16th to endNight
20%
1040
12%
2892
2%
1040
27%
1040
16%
2198
February1st to 15thNight
24%
946
15%
2477
3%
945
32%
945
21%
1751
February16th to endNight
26%
683
16%
2049
6%
683
35%
683
17%
1460
March1st to 15thNight
31%
780
16%
2340
9%
780
38%
780
21%
1570
March16th to endNight
36%
631
18%
2167
16%
631
43%
631
20%
1446
April1st to 15thNight
28%
584
15%
1947
10%
584
36%
584
19%
1338
April16th to endNight
37%
579
18%
1857
12%
579
45%
579
23%
1240
May1st to 15thNight
31%
585
14%
1606
7%
585
37%
585
21%
1161
May16th to endNight
47%
610
14%
1626
7%
609
52%
609
30%
1066
June1st to 15thNight
47%
585
12%
1560
6%
585
50%
585
28%
1030
June16th to endNight
50%
585
13%
1560
7%
585
54%
585
33%
1000
July1st to 15thNight
63%
555
18%
1480
10%
555
65%
555
44%
839
July16th to endNight
62%
612
19%
1545
12%
579
66%
579
45%
888
August1st to 15thNight
67%
575
22%
1581
17%
572
70%
572
38%
954
August16th to endNight
57%
615
19%
2050
20%
615
61%
615
29%
1223
September1st to 15thNight
58%
540
24%
1800
23%
540
64%
540
34%
1004
September16th to endNight
52%
687
22%
1950
16%
687
57%
687
33%
1184
October1st to 15thNight
41%
720
21%
2133
14%
720
48%
720
27%
1346
October16th to endNight
33%
768
16%
2436
9%
768
42%
768
20%
1659
November1st to 15thNight
31%
760
20%
2471
13%
760
41%
760
23%
1566
November16th to endNight
25%
946
14%
2701
6%
946
33%
946
19%
1893
December1st to 15thNight
20%
975
11%
2730
3%
975
27%
975
17%
2004
December16th to endNight
17%
1040
13%
2912
3%
1040
26%
1040
13%
2263

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%
51676
Night
13%7%35%5%2445%6%40%
50753
Cloud CoverDay
13%7%36%5%3445%7%37%
51684
Night
13%7%35%5%2445%6%40%
50758
TransparencyDay
45%6%13%22%10%1
51361
Night
43%6%13%22%12%1
50586
SeeingDay
15%7%28%27%15%4
7371
Night
17%7%31%30%11%1
17379

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%11%6%7%6%35%446%32%
1552
16th to endDay
11%13%6%11%7%44446%25%
1680
February1st to 15thDay
10%12%47%5%25%45%5%34%
1715
16th to endDay
13%11%46%5%35%5%5%7%32%
1710
March1st to 15thDay
13%10%46%5%2445%6%36%
1943
16th to endDay
16%9%46%5%2435%7%35%
2415
April1st to 15thDay
17%10%46%5%35%446%31%
2331
16th to endDay
20%8%36%5%24345%35%
2378
May1st to 15thDay
19%6%26%5%25%5%5%6%33%
2672
16th to endDay
12%415%5%35%5%6%6%41%
2841
June1st to 15thDay
14%5%245%25%45%9%38%
2730
16th to endDay
11%5%26%5%25%6%6%8%39%
2730
July1st to 15thDay
6%3245%45%6%7%9%45%
2730
16th to endDay
9%425%5%35%6%6%8%43%
2879
August1st to 15thDay
8%3346%36%6%6%8%42%
2621
16th to endDay
14%6%25%42435%7%43%
2448
September1st to 15thDay
12%415%5%2345%7%46%
2160
16th to endDay
11%6%27%5%3445%7%41%
1998
October1st to 15thDay
16%7%245%24347%39%
1826
16th to endDay
16%7%36%6%2435%6%34%
1788
November1st to 15thDay
14%7%36%5%3435%6%39%
1717
16th to endDay
15%8%46%5%34447%35%
1588
December1st to 15thDay
16%10%47%6%2445%6%31%
1560
16th to endDay
19%14%5%8%6%45%445%20%
1664
January1st to 15thNight
14%10%5%7%6%34345%35%
2716
16th to endNight
11%10%5%8%7%35%6%5%7%27%
2892
February1st to 15thNight
10%11%5%7%5%34445%38%
2474
16th to endNight
14%11%36%5%34445%35%
2049
March1st to 15thNight
13%7%35%5%3345%6%41%
2327
16th to endNight
15%9%35%42445%5%38%
2167
April1st to 15thNight
21%7%35%423445%36%
1947
16th to endNight
19%6%24424446%40%
1857
May1st to 15thNight
20%7%345%25%45%5%35%
1606
16th to endNight
11%415%425%5%6%8%43%
1624
June1st to 15thNight
10%4346%35%45%7%44%
1560
16th to endNight
8%4244245%7%7%46%
1560
July1st to 15thNight
6%22332345%9%56%
1560
16th to endNight
7%21342346%8%55%
1641
August1st to 15thNight
7%4144245%5%7%52%
1590
16th to endNight
12%5%1342445%7%48%
2050
September1st to 15thNight
10%413324447%53%
1800
16th to endNight
10%424434446%50%
1950
October1st to 15thNight
14%5%25%423348%46%
2133
16th to endNight
16%7%25%5%3445%6%37%
2436
November1st to 15thNight
15%6%34423337%44%
2471
16th to endNight
16%7%35%5%3445%8%34%
2701
December1st to 15thNight
14%12%46%43445%6%32%
2730
16th to endNight
19%13%5%7%6%24345%27%
2912

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%10%6%8%5%35%445%32%
1552
16th to endDay
11%14%5%10%8%34446%25%
1680
February1st to 15thDay
11%11%48%6%25%45%6%34%
1715
16th to endDay
12%12%47%5%25%45%7%32%
1710
March1st to 15thDay
13%9%47%5%34446%35%
1953
16th to endDay
16%9%36%425%35%7%35%
2413
April1st to 15thDay
17%11%46%5%34445%31%
2331
16th to endDay
19%9%36%6%24345%35%
2378
May1st to 15thDay
19%6%26%6%35%5%5%6%32%
2672
16th to endDay
12%425%5%35%5%6%7%41%
2841
June1st to 15thDay
14%5%25%5%35%5%6%9%37%
2730
16th to endDay
10%5%26%5%36%5%6%9%38%
2730
July1st to 15thDay
5%3245%45%6%7%9%45%
2730
16th to endDay
9%4245%36%6%5%9%43%
2879
August1st to 15thDay
8%325%6%36%6%6%9%41%
2621
16th to endDay
13%5%35%43445%7%42%
2448
September1st to 15thDay
11%5%25%43345%7%46%
2160
16th to endDay
10%5%37%5%3446%7%42%
1998
October1st to 15thDay
17%7%25%5%23447%39%
1826
16th to endDay
15%9%37%6%2435%6%35%
1788
November1st to 15thDay
14%7%36%6%3345%5%38%
1717
16th to endDay
15%8%36%5%34447%35%
1588
December1st to 15thDay
16%10%47%5%3445%6%31%
1560
16th to endDay
19%14%49%7%35%345%20%
1664
January1st to 15thNight
14%10%47%6%34345%35%
2716
16th to endNight
11%11%5%9%6%45%5%5%6%27%
2892
February1st to 15thNight
11%11%5%7%433445%38%
2467
16th to endNight
14%10%46%5%34435%34%
2049
March1st to 15thNight
13%7%25%5%35%346%40%
2340
16th to endNight
16%8%45%42445%5%38%
2167
April1st to 15thNight
21%8%25%5%23446%36%
1947
16th to endNight
18%7%24434446%39%
1857
May1st to 15thNight
20%7%25%5%3445%6%34%
1605
16th to endNight
11%4244245%6%9%43%
1624
June1st to 15thNight
10%436%5%345%5%8%43%
1560
16th to endNight
7%5%244245%7%9%45%
1560
July1st to 15thNight
5%32232346%8%56%
1560
16th to endNight
6%31332346%9%54%
1641
August1st to 15thNight
7%4145%245%5%7%52%
1590
16th to endNight
12%42332435%7%48%
2050
September1st to 15thNight
9%41332345%7%53%
1800
16th to endNight
10%424433447%49%
1950
October1st to 15thNight
14%5%34423347%46%
2133
16th to endNight
15%8%26%5%2445%6%37%
2436
November1st to 15thNight
15%7%34423347%43%
2471
16th to endNight
16%7%35%5%3445%7%35%
2701
December1st to 15thNight
14%13%36%5%2345%6%32%
2730
16th to endNight
19%13%5%7%5%24346%27%
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
52%6%11%19%9%
1553
16th to endDay
60%5%12%14%6%
1680
February1st to 15thDay
50%5%13%20%8%1
1716
16th to endDay
50%7%12%19%8%1
1710
March1st to 15thDay
48%5%14%19%9%1
1953
16th to endDay
48%6%14%22%7%1
2415
April1st to 15thDay
53%6%10%18%10%
2331
16th to endDay
51%5%10%19%11%2
2378
May1st to 15thDay
50%7%13%20%7%
2672
16th to endDay
39%8%12%24%13%1
2845
June1st to 15thDay
41%7%14%25%10%
2730
16th to endDay
39%8%15%23%11%
2730
July1st to 15thDay
33%8%15%26%13%3
2581
16th to endDay
36%8%15%21%14%2
2712
August1st to 15thDay
35%9%16%26%11%1
2606
16th to endDay
38%7%14%24%13%1
2448
September1st to 15thDay
36%6%12%29%14%
2160
16th to endDay
39%7%15%27%10%
1998
October1st to 15thDay
44%5%13%25%11%
1826
16th to endDay
49%6%14%21%7%
1788
November1st to 15thDay
46%412%23%11%1
1717
16th to endDay
49%6%16%20%6%
1588
December1st to 15thDay
53%5%14%20%6%
1560
16th to endDay
65%5%9%11%7%
1664
January1st to 15thNight
51%6%11%19%11%
2716
16th to endNight
55%7%12%17%7%
2892
February1st to 15thNight
47%5%12%22%10%1
2477
16th to endNight
51%5%12%21%8%1
2049
March1st to 15thNight
44%6%12%21%12%2
2340
16th to endNight
46%5%12%24%9%1
2167
April1st to 15thNight
49%5%8%19%15%1
1947
16th to endNight
45%5%10%20%15%2
1857
May1st to 15thNight
49%7%14%17%11%
1606
16th to endNight
36%7%14%24%14%1
1626
June1st to 15thNight
38%7%13%26%13%
1560
16th to endNight
33%8%15%24%15%2
1560
July1st to 15thNight
24%6%14%29%20%4
1480
16th to endNight
24%6%18%30%16%3
1545
August1st to 15thNight
29%8%15%28%17%1
1581
16th to endNight
34%7%13%25%16%2
2050
September1st to 15thNight
30%5%11%28%22%
1800
16th to endNight
33%6%13%33%12%
1950
October1st to 15thNight
38%5%10%29%14%1
2133
16th to endNight
46%6%14%21%11%
2436
November1st to 15thNight
42%5%13%23%14%1
2471
16th to endNight
47%6%17%19%7%
2701
December1st to 15thNight
52%5%14%18%7%
2730
16th to endNight
59%6%11%15%6%
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
18%9%34%28%9%
135
16th to endDay
18%436%34%6%
144
February1st to 15thDay
17%9%48%20%5%
135
16th to endDay
23%15%40%15%5%
120
March1st to 15thDay
22%11%34%21%8%1
135
16th to endDay
26%5%28%23%13%2
271
April1st to 15thDay
26%11%26%26%8%
330
16th to endDay
21%8%29%21%14%4
319
May1st to 15thDay
21%10%31%24%9%2
494
16th to endDay
15%7%27%29%13%5%
597
June1st to 15thDay
14%8%28%29%15%3
570
16th to endDay
10%8%30%29%15%4
570
July1st to 15thDay
6%423%33%22%9%
550
16th to endDay
9%326%29%21%8%
595
August1st to 15thDay
10%322%30%25%8%
539
16th to endDay
16%419%26%25%7%
384
September1st to 15thDay
13%220%28%23%11%
315
16th to endDay
11%5%24%32%21%4
314
October1st to 15thDay
20%11%28%23%13%2
161
16th to endDay
17%9%38%27%6%
144
November1st to 15thDay
14%11%31%25%13%2
135
16th to endDay
25%11%42%15%5%
135
December1st to 15thDay
16%18%45%15%3
135
16th to endDay
32%18%36%9%2
144
January1st to 15thNight
19%11%35%27%5%
975
16th to endNight
16%9%40%27%5%
1040
February1st to 15thNight
16%9%39%29%5%
948
16th to endNight
20%10%35%25%7%
683
March1st to 15thNight
17%9%34%27%11%
780
16th to endNight
17%7%32%30%10%1
631
April1st to 15thNight
24%7%37%24%6%
584
16th to endNight
21%6%30%31%8%
579
May1st to 15thNight
25%6%33%27%6%
585
16th to endNight
13%5%27%37%14%
611
June1st to 15thNight
12%5%27%40%13%
585
16th to endNight
11%329%41%13%1
585
July1st to 15thNight
6%321%43%23%1
555
16th to endNight
7%22%43%23%2
612
August1st to 15thNight
8%214%45%25%2
575
16th to endNight
13%222%35%24%3
615
September1st to 15thNight
11%223%33%22%6%
540
16th to endNight
12%5%24%34%21%1
687
October1st to 15thNight
17%8%27%30%14%1
720
16th to endNight
19%10%32%27%8%
768
November1st to 15thNight
19%8%36%23%10%1
760
16th to endNight
19%13%34%25%6%
946
December1st to 15thNight
22%10%39%22%5%
975
16th to endNight
26%8%37%22%4
1040
Page generated at 2018-08-30 04:34:22. Version ac04

Copyright 2018 A. Danko


Hartman Creek State Park Clear Sky Chart |Charts Home