Hobbs State Park
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Hobbs State Park clear sky chart from 2005-11-05 to 2018-01-20.

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
38%
16299
25%
48761
14%
16252
48%
16252
30%
28823

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
20%
975
25%
2522
7%
970
34%
970
26%
1613
January16th to endNight
23%
985
28%
2561
7%
985
37%
985
29%
1570
February1st to 15thNight
18%
880
19%
2288
5%
876
28%
876
26%
1490
February16th to endNight
18%
612
26%
1874
7%
612
34%
612
23%
1117
March1st to 15thNight
23%
540
22%
1980
11%
540
38%
540
19%
1261
March16th to endNight
25%
576
17%
2112
11%
576
35%
576
18%
1347
April1st to 15thNight
25%
539
23%
1842
11%
539
43%
539
26%
1042
April16th to endNight
27%
540
21%
1800
11%
540
43%
540
25%
1095
May1st to 15thNight
35%
540
21%
1630
14%
540
46%
540
28%
1007
May16th to endNight
44%
563
20%
1685
15%
561
52%
561
30%
1029
June1st to 15thNight
63%
540
21%
1620
16%
540
68%
540
45%
831
June16th to endNight
64%
540
24%
1620
17%
540
71%
540
46%
837
July1st to 15thNight
66%
510
17%
1530
16%
510
68%
510
39%
867
July16th to endNight
78%
564
26%
1594
29%
531
80%
531
45%
843
August1st to 15thNight
74%
539
25%
1610
29%
536
76%
536
40%
883
August16th to endNight
70%
573
25%
1877
28%
573
74%
573
36%
1028
September1st to 15thNight
62%
540
27%
1821
27%
540
66%
540
35%
993
September16th to endNight
57%
550
32%
1993
28%
550
65%
550
33%
1039
October1st to 15thNight
47%
720
29%
2160
19%
720
55%
720
39%
1192
October16th to endNight
36%
768
33%
2304
15%
768
50%
768
37%
1256
November1st to 15thNight
35%
760
30%
2280
15%
760
49%
760
34%
1285
November16th to endNight
27%
930
28%
2588
12%
930
40%
930
29%
1586
December1st to 15thNight
23%
975
22%
2730
7%
975
35%
975
28%
1724
December16th to endNight
20%
1040
24%
2740
7%
1040
33%
1040
22%
1888

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
11%6%25%43445%7%44%
48755
Night
10%5%24423347%50%
48956
TransparencyDay
39%5%11%24%16%3
48455
Night
34%411%25%20%4
48761
SeeingDay
13%9%26%26%18%4
6160
Night
14%12%30%26%14%1
16299

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
14%8%23322236%47%
1746
16th to endDay
11%7%25%323336%49%
1767
February1st to 15thDay
14%8%35%424235%43%
1575
16th to endDay
12%9%45%423336%43%
1608
March1st to 15thDay
15%9%35%323345%41%
1980
16th to endDay
18%8%35%5%24445%36%
2110
April1st to 15thDay
14%6%35%425%346%43%
2106
16th to endDay
17%7%36%6%24435%37%
2160
May1st to 15thDay
16%5%35%6%45%45%5%38%
2319
16th to endDay
10%6%35%6%36%5%5%7%38%
2430
June1st to 15thDay
7%325%5%35%6%7%8%43%
2340
16th to endDay
5%323447%6%7%11%45%
2340
July1st to 15thDay
8%425%6%46%6%7%10%35%
2340
16th to endDay
5%2145%35%5%7%12%44%
2466
August1st to 15thDay
7%3146%35%5%8%9%43%
2340
16th to endDay
7%415%5%35%6%7%9%43%
2324
September1st to 15thDay
13%5%2443345%6%46%
2136
16th to endDay
8%5%2433345%8%49%
1953
October1st to 15thDay
13%414322437%51%
1800
16th to endDay
10%5%2431323457%
1920
November1st to 15thDay
11%6%23323336%51%
1908
16th to endDay
15%7%23312335%49%
1694
December1st to 15thDay
14%7%35%42444345%
1560
16th to endDay
14%11%35%423346%40%
1833
January1st to 15thNight
13%6%34323346%47%
2522
16th to endNight
10%6%34423235%52%
2561
February1st to 15thNight
12%8%26%313345%46%
2278
16th to endNight
10%7%245%23337%49%
1874
March1st to 15thNight
12%8%36%434446%41%
1980
16th to endNight
17%8%35%425%335%41%
2112
April1st to 15thNight
10%5%23324447%49%
1842
16th to endNight
14%6%2442435%7%45%
1800
May1st to 15thNight
11%6%24425%45%6%47%
1629
16th to endNight
11%42443445%9%44%
1683
June1st to 15thNight
431432345%9%58%
1620
16th to endNight
31123245%6%10%57%
1620
July1st to 15thNight
5%323415%5%6%11%50%
1620
16th to endNight
321342446%10%55%
1702
August1st to 15thNight
5%2134245%6%12%50%
1620
16th to endNight
3314445%6%7%8%49%
1877
September1st to 15thNight
9%5%13423447%52%
1821
16th to endNight
7%414433347%54%
1993
October1st to 15thNight
10%31332235%8%53%
2160
16th to endNight
11%41232333459%
2304
November1st to 15thNight
10%5%14223335%56%
2280
16th to endNight
13%7%24323325%51%
2588
December1st to 15thNight
14%7%34323346%46%
2730
16th to endNight
14%10%37%5%2233441%
2740

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
38%39%27%19%2
1747
16th to endDay
37%29%28%17%4
1767
February1st to 15thDay
44%310%26%12%2
1576
16th to endDay
43%38%24%15%4
1608
March1st to 15thDay
44%48%20%16%6%
1980
16th to endDay
49%311%22%12%1
2112
April1st to 15thDay
42%412%22%17%1
2106
16th to endDay
49%49%18%15%2
2160
May1st to 15thDay
47%5%10%21%14%
2319
16th to endDay
43%7%13%23%11%
2434
June1st to 15thDay
35%7%14%27%15%
2340
16th to endDay
30%7%17%26%15%2
2340
July1st to 15thDay
39%7%15%26%10%
2201
16th to endDay
31%7%17%30%12%1
2311
August1st to 15thDay
33%7%16%23%16%1
2326
16th to endDay
35%7%14%23%14%5%
2324
September1st to 15thDay
37%5%11%22%15%7%
2136
16th to endDay
32%410%27%20%3
1953
October1st to 15thDay
34%5%9%25%19%6%
1800
16th to endDay
31%27%28%22%7%
1920
November1st to 15thDay
33%38%27%18%7%
1908
16th to endDay
37%38%21%26%2
1694
December1st to 15thDay
43%29%22%18%2
1560
16th to endDay
45%49%23%13%3
1833
January1st to 15thNight
37%310%26%19%2
2522
16th to endNight
34%29%27%21%3
2561
February1st to 15thNight
40%210%26%16%3
2288
16th to endNight
36%310%27%18%3
1874
March1st to 15thNight
43%6%7%19%19%4
1980
16th to endNight
45%49%22%15%2
2112
April1st to 15thNight
33%411%25%20%4
1842
16th to endNight
38%410%25%18%2
1800
May1st to 15thNight
36%7%13%21%19%2
1630
16th to endNight
34%6%18%25%13%1
1685
June1st to 15thNight
22%5%16%32%21%2
1620
16th to endNight
20%6%15%31%20%4
1620
July1st to 15thNight
26%8%15%29%18%1
1530
16th to endNight
22%6%14%35%20%1
1594
August1st to 15thNight
25%6%14%30%20%2
1610
16th to endNight
27%6%14%25%19%5%
1877
September1st to 15thNight
31%410%27%17%9%
1821
16th to endNight
29%49%25%25%4
1993
October1st to 15thNight
28%412%24%21%9%
2160
16th to endNight
28%37%26%25%8%
2304
November1st to 15thNight
30%38%26%22%8%
2280
16th to endNight
36%27%22%26%4
2588
December1st to 15thNight
39%311%22%20%3
2730
16th to endNight
46%38%21%15%4
2740

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
27%19%37%13%2
135
16th to endDay
15%29%39%9%6%
109
February1st to 15thDay
18%26%41%11%2
90
16th to endDay
27%24%35%9%2
81
March1st to 15thDay
23%33%32%11%
90
16th to endDay
22%25%33%13%5%
96
April1st to 15thDay
19%20%35%16%7%
225
16th to endDay
28%13%31%16%10%
270
May1st to 15thDay
17%15%36%20%8%1
456
16th to endDay
15%10%37%21%12%2
517
June1st to 15thDay
8%423%37%20%5%
495
16th to endDay
6%428%35%20%4
495
July1st to 15thDay
10%320%39%21%4
475
16th to endDay
6%16%34%39%11%
515
August1st to 15thDay
11%110%34%35%7%
493
16th to endDay
11%112%35%29%8%
364
September1st to 15thDay
10%214%29%34%7%
291
16th to endDay
7%23%35%21%11%
135
October1st to 15thDay
11%8%37%25%12%3
135
16th to endDay
11%13%46%18%9%
144
November1st to 15thDay
18%14%36%14%13%2
135
16th to endDay
25%20%37%14%2
135
December1st to 15thDay
14%24%38%14%5%2
135
16th to endDay
20%29%36%11%1
144
January1st to 15thNight
20%22%33%18%4
975
16th to endNight
15%22%36%20%4
985
February1st to 15thNight
17%21%40%18%2
880
16th to endNight
17%20%40%18%2
612
March1st to 15thNight
21%14%37%23%3
540
16th to endNight
20%14%37%20%7%
576
April1st to 15thNight
13%18%39%22%5%
539
16th to endNight
17%15%38%19%9%
540
May1st to 15thNight
14%8%38%27%10%
540
16th to endNight
13%7%29%31%16%1
563
June1st to 15thNight
5%222%43%24%1
540
16th to endNight
3124%42%25%2
540
July1st to 15thNight
6%117%41%30%1
510
16th to endNight
45%41%40%6%
564
August1st to 15thNight
6%10%34%41%6%
539
16th to endNight
4115%41%32%5%
573
September1st to 15thNight
11%116%37%29%3
540
16th to endNight
10%320%33%27%4
550
October1st to 15thNight
11%5%31%27%20%4
720
16th to endNight
13%11%36%23%14%
768
November1st to 15thNight
13%14%34%25%11%
760
16th to endNight
19%16%34%21%8%
930
December1st to 15thNight
20%14%37%21%5%
975
16th to endNight
21%17%35%21%3
1040
Page generated at 2018-01-21 11:19:23. Version ac04

Copyright 2018 A. Danko


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