Hooker's Prairie
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Hooker's Prairie clear sky chart from 2005-11-05 to 2017-09-23.

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
62%
15950
20%
47027
16%
15910
66%
15910
29%
29938

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
51%
718
19%
2327
15%
716
58%
716
25%
1458
January16th to endNight
47%
768
24%
2406
17%
768
56%
768
29%
1465
February1st to 15thNight
48%
701
24%
2105
17%
699
56%
699
32%
1274
February16th to endNight
50%
631
25%
1842
16%
631
59%
631
36%
1077
March1st to 15thNight
53%
720
29%
1980
18%
720
63%
720
42%
1120
March16th to endNight
57%
768
26%
2112
20%
768
60%
768
39%
1230
April1st to 15thNight
63%
718
22%
1976
18%
718
66%
718
45%
1099
April16th to endNight
62%
720
26%
1872
17%
720
66%
720
41%
1107
May1st to 15thNight
75%
560
28%
1640
23%
560
78%
560
45%
886
May16th to endNight
77%
561
23%
1683
19%
561
78%
561
35%
1030
June1st to 15thNight
71%
540
10%
1620
9%
540
71%
540
22%
1151
June16th to endNight
76%
540
7%
1620
6%
540
76%
540
20%
1185
July1st to 15thNight
72%
510
5%
1530
5%
510
72%
510
19%
1174
July16th to endNight
77%
564
6%
1595
6%
531
77%
531
18%
1209
August1st to 15thNight
80%
539
5%
1654
5%
536
80%
536
24%
1166
August16th to endNight
66%
711
7%
2048
7%
711
66%
711
19%
1510
September1st to 15thNight
66%
720
7%
1980
7%
720
67%
720
17%
1503
September16th to endNight
62%
689
12%
1903
11%
689
63%
689
19%
1400
October1st to 15thNight
71%
660
24%
1856
25%
660
73%
660
33%
1171
October16th to endNight
56%
704
26%
2112
23%
704
62%
704
31%
1287
November1st to 15thNight
63%
700
30%
2101
26%
700
69%
700
38%
1194
November16th to endNight
55%
720
29%
2229
24%
720
63%
720
33%
1323
December1st to 15thNight
56%
720
24%
2340
22%
720
61%
720
27%
1430
December16th to endNight
58%
768
23%
2496
23%
768
62%
768
29%
1489

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
7%5%36%7%46%6%6%8%36%
47860
Night
6%425%5%35%5%6%9%43%
47233
TransparencyDay
42%9%13%15%12%5%
47561
Night
34%9%16%18%14%5%
47036
SeeingDay
8%212%21%25%29%
5802
Night
8%216%34%27%9%
15958

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
10%7%26%5%246%6%9%37%
1611
16th to endDay
10%425%4245%5%7%47%
1815
February1st to 15thDay
11%5%345%245%5%6%45%
1750
16th to endDay
7%5%15%5%3445%8%48%
1628
March1st to 15thDay
43145%35%5%5%6%53%
1980
16th to endDay
8%315%5%35%5%5%7%49%
2111
April1st to 15thDay
6%3246%46%6%6%8%45%
1972
16th to endDay
5%425%445%5%5%7%47%
2087
May1st to 15thDay
42146%36%6%5%7%50%
2319
16th to endDay
6%437%7%48%7%7%9%34%
2431
June1st to 15thDay
11%8%38%9%5%7%7%6%9%23%
2340
16th to endDay
7%5%48%10%6%7%8%9%9%21%
2340
July1st to 15thDay
9%6%48%9%5%10%9%8%8%18%
2340
16th to endDay
8%6%48%11%5%10%7%7%9%19%
2465
August1st to 15thDay
5%6%49%10%7%9%8%7%8%23%
2291
16th to endDay
11%6%38%10%5%8%6%8%8%21%
2139
September1st to 15thDay
8%6%38%10%6%8%8%9%8%21%
1980
16th to endDay
9%8%310%9%6%7%6%7%8%22%
1894
October1st to 15thDay
7%5%26%6%47%6%6%8%37%
1774
16th to endDay
9%5%25%445%45%7%44%
1760
November1st to 15thDay
5%325%5%345%5%7%50%
1757
16th to endDay
7%425%5%35%5%47%47%
1728
December1st to 15thDay
8%6%26%5%35%5%5%7%42%
1620
16th to endDay
7%5%35%5%345%5%9%45%
1728
January1st to 15thNight
9%5%35%5%25%46%9%41%
2327
16th to endNight
11%425%435%5%5%8%43%
2406
February1st to 15thNight
9%5%24434447%47%
2103
16th to endNight
6%5%2442445%8%49%
1842
March1st to 15thNight
42144245%6%7%55%
1980
16th to endNight
5%225%434447%54%
2112
April1st to 15thNight
42134145%7%9%54%
1976
16th to endNight
5%41443446%8%52%
1872
May1st to 15thNight
321432435%9%58%
1640
16th to endNight
5%413425%6%7%8%50%
1682
June1st to 15thNight
9%6%35%6%35%6%8%10%33%
1620
16th to endNight
5%426%7%46%8%9%11%31%
1620
July1st to 15thNight
5%5%37%8%46%6%10%11%30%
1620
16th to endNight
4427%7%5%8%9%10%13%26%
1703
August1st to 15thNight
4425%6%46%8%8%13%35%
1665
16th to endNight
8%5%36%7%46%6%8%12%30%
2048
September1st to 15thNight
6%6%36%7%47%7%9%12%27%
1980
16th to endNight
7%7%37%7%5%7%6%7%9%29%
1903
October1st to 15thNight
6%415%5%445%6%9%46%
1856
16th to endNight
8%5%34333447%49%
2112
November1st to 15thNight
5%315%4245%5%8%52%
2101
16th to endNight
6%4345%25%5%6%8%47%
2229
December1st to 15thNight
8%5%25%5%35%45%8%44%
2340
16th to endNight
5%425%5%35%6%6%8%45%
2496

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
39%7%9%19%18%5%
1612
16th to endDay
35%49%18%23%8%
1815
February1st to 15thDay
38%48%14%20%13%
1752
16th to endDay
33%5%11%16%21%10%
1628
March1st to 15thDay
29%5%11%23%21%8%
1980
16th to endDay
32%6%10%20%21%8%
2112
April1st to 15thDay
34%7%13%19%18%7%
1972
16th to endDay
33%6%10%17%22%8%
2087
May1st to 15thDay
29%9%13%21%18%8%
2319
16th to endDay
42%10%13%18%13%1
2435
June1st to 15thDay
54%11%16%14%2
2340
16th to endDay
53%14%18%11%1
2340
July1st to 15thDay
57%17%17%5%1
2201
16th to endDay
55%15%19%8%1
2310
August1st to 15thDay
51%16%23%7%
2278
16th to endDay
55%16%17%9%
2139
September1st to 15thDay
53%15%20%7%2
1980
16th to endDay
55%10%16%11%41
1894
October1st to 15thDay
41%9%10%16%14%7%
1774
16th to endDay
37%6%9%14%19%12%
1760
November1st to 15thDay
31%49%23%21%9%
1757
16th to endDay
35%6%9%18%16%13%
1728
December1st to 15thDay
39%6%12%17%17%6%
1620
16th to endDay
34%5%13%19%18%7%
1728
January1st to 15thNight
39%6%12%20%15%5%
2327
16th to endNight
37%5%10%20%18%8%
2406
February1st to 15thNight
34%5%8%16%21%12%
2112
16th to endNight
30%6%14%19%21%7%
1842
March1st to 15thNight
25%7%12%26%20%7%
1980
16th to endNight
28%6%12%23%21%8%
2112
April1st to 15thNight
24%5%19%24%19%6%
1976
16th to endNight
27%6%13%22%22%6%
1872
May1st to 15thNight
22%7%15%29%19%6%
1641
16th to endNight
28%11%18%23%16%1
1684
June1st to 15thNight
41%13%22%16%5%
1620
16th to endNight
41%16%24%13%4
1620
July1st to 15thNight
43%18%28%8%1
1530
16th to endNight
40%21%26%11%
1595
August1st to 15thNight
34%18%36%9%
1654
16th to endNight
43%16%27%11%1
2048
September1st to 15thNight
44%18%21%13%1
1980
16th to endNight
47%12%19%14%42
1903
October1st to 15thNight
33%8%13%18%18%7%
1856
16th to endNight
34%6%10%15%23%9%
2112
November1st to 15thNight
29%5%10%21%22%10%
2101
16th to endNight
33%5%10%20%16%12%
2229
December1st to 15thNight
36%7%13%21%15%5%
2340
16th to endNight
33%8%14%19%17%7%
2496

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
23%7%26%23%14%4
90
16th to endDay
11%14%32%27%12%2
96
February1st to 15thDay
11%8%23%30%20%6%
90
16th to endDay
10%5%35%34%14%
129
March1st to 15thDay
4331%35%22%2
270
16th to endDay
9%5%20%30%28%4
288
April1st to 15thDay
5%322%31%29%7%
270
16th to endDay
7%215%25%33%16%
270
May1st to 15thDay
5%111%26%34%20%
288
16th to endDay
7%16%19%29%36%
331
June1st to 15thDay
19%15%12%24%37%
315
16th to endDay
5%212%23%56%
315
July1st to 15thDay
7%5%14%71%
305
16th to endDay
12%1310%19%53%
326
August1st to 15thDay
7%47%18%62%
313
16th to endDay
10%5%11%21%50%
332
September1st to 15thDay
11%16%13%21%45%
315
16th to endDay
8%313%36%38%
283
October1st to 15thDay
5%28%30%36%17%
255
16th to endDay
12%19%28%28%10%
272
November1st to 15thDay
6%116%33%29%11%
265
16th to endDay
8%223%34%25%6%
198
December1st to 15thDay
7%333%40%15%
90
16th to endDay
5%415%34%36%4
96
January1st to 15thNight
13%5%22%39%18%1
720
16th to endNight
12%5%29%38%13%
768
February1st to 15thNight
12%5%28%40%11%
704
16th to endNight
9%429%43%12%
631
March1st to 15thNight
6%332%44%13%
720
16th to endNight
7%326%43%17%1
768
April1st to 15thNight
5%324%46%20%
718
16th to endNight
7%221%44%22%
720
May1st to 15thNight
413%45%32%2
561
16th to endNight
5%9%38%38%7%
563
June1st to 15thNight
9%15%23%45%14%
540
16th to endNight
6%215%41%34%
540
July1st to 15thNight
7%28%47%34%
510
16th to endNight
5%110%45%37%
564
August1st to 15thNight
6%18%45%38%
539
16th to endNight
11%415%38%29%
711
September1st to 15thNight
10%15%22%39%20%
720
16th to endNight
13%6%25%39%13%
689
October1st to 15thNight
9%7%42%35%4
660
16th to endNight
11%219%33%31%1
704
November1st to 15thNight
7%120%43%23%3
700
16th to endNight
8%226%42%19%1
720
December1st to 15thNight
9%422%40%22%
720
16th to endNight
7%322%42%22%1
768
Page generated at 2017-09-24 09:15:54. Version ac04

Copyright 2017 A. Danko


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