Hodges and North Wildlife Area
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Hodges and North Wildlife Area clear sky chart from 2005-11-05 to 2017-10-31.

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%
16195
18%
47393
11%
16149
45%
16149
26%
31022

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
28%
900
14%
2506
6%
895
35%
895
21%
1777
January16th to endNight
23%
960
15%
2520
5%
960
30%
960
19%
1871
February1st to 15thNight
25%
879
13%
2288
3%
876
31%
876
21%
1658
February16th to endNight
33%
693
19%
1955
8%
693
41%
693
24%
1298
March1st to 15thNight
32%
606
19%
2046
12%
606
41%
606
23%
1261
March16th to endNight
27%
576
11%
2073
7%
576
36%
576
15%
1453
April1st to 15thNight
28%
539
16%
1797
11%
539
37%
539
21%
1183
April16th to endNight
34%
540
19%
1766
14%
540
44%
540
21%
1193
May1st to 15thNight
36%
540
18%
1506
9%
540
43%
540
25%
1026
May16th to endNight
43%
563
17%
1497
7%
561
50%
561
31%
977
June1st to 15thNight
50%
540
14%
1440
6%
540
54%
540
32%
933
June16th to endNight
54%
540
19%
1440
9%
540
58%
540
37%
880
July1st to 15thNight
71%
510
17%
1360
10%
510
73%
510
45%
777
July16th to endNight
70%
564
23%
1456
17%
531
71%
531
44%
826
August1st to 15thNight
69%
539
21%
1610
21%
536
72%
536
39%
908
August16th to endNight
62%
573
21%
1857
23%
573
65%
573
34%
1051
September1st to 15thNight
63%
540
27%
1800
27%
540
68%
540
37%
965
September16th to endNight
53%
612
26%
1962
19%
612
62%
612
37%
1081
October1st to 15thNight
39%
720
23%
2160
15%
720
46%
720
30%
1329
October16th to endNight
34%
768
21%
2317
12%
768
42%
768
25%
1482
November1st to 15thNight
35%
733
23%
2309
15%
733
45%
733
28%
1402
November16th to endNight
27%
900
16%
2520
7%
900
34%
900
23%
1701
December1st to 15thNight
21%
900
12%
2520
4%
900
28%
900
17%
1890
December16th to endNight
23%
960
13%
2688
5%
960
31%
960
14%
2100

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
14%7%36%5%3445%7%37%
48362
Night
13%7%35%5%24346%42%
47566
Cloud CoverDay
14%7%36%5%3445%7%37%
48371
Night
13%7%35%5%24346%42%
47570
TransparencyDay
45%6%13%23%11%1
48052
Night
42%413%24%13%1
47394
SeeingDay
15%7%27%28%17%4
6182
Night
16%7%30%31%12%1
16196

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%10%5%7%7%5%6%446%29%
1432
16th to endDay
13%10%7%11%7%35%5%5%6%22%
1702
February1st to 15thDay
11%12%6%8%6%335%46%31%
1575
16th to endDay
14%9%35%5%36%5%5%5%34%
1518
March1st to 15thDay
15%8%36%6%24347%35%
1912
16th to endDay
18%11%46%42435%7%29%
2151
April1st to 15thDay
18%9%36%4235%5%6%32%
2151
16th to endDay
24%9%26%434446%30%
2193
May1st to 15thDay
19%8%36%6%345%5%6%31%
2445
16th to endDay
15%6%26%5%3446%6%37%
2617
June1st to 15thDay
14%5%25%425%5%5%8%40%
2520
16th to endDay
10%5%24425%5%6%8%42%
2520
July1st to 15thDay
7%4245%35%5%6%8%45%
2520
16th to endDay
7%3245%35%5%7%10%42%
2610
August1st to 15thDay
8%425%435%5%7%8%44%
2340
16th to endDay
12%5%25%5%35%5%5%8%42%
2344
September1st to 15thDay
12%423413347%51%
2160
16th to endDay
12%425%5%3345%7%46%
1982
October1st to 15thDay
17%6%34423346%44%
1800
16th to endDay
16%7%25%42335%6%40%
1905
November1st to 15thDay
13%6%34432346%46%
1549
16th to endDay
17%8%35%43335%5%38%
1440
December1st to 15thDay
18%13%5%8%6%34345%26%
1440
16th to endDay
19%15%6%9%6%4422423%
1536
January1st to 15thNight
11%9%47%6%34347%35%
2506
16th to endNight
11%10%5%10%7%24446%31%
2520
February1st to 15thNight
11%11%5%8%6%2435%5%35%
2285
16th to endNight
12%8%35%6%24346%41%
1955
March1st to 15thNight
15%8%24423235%46%
2034
16th to endNight
17%9%38%5%35%347%31%
2073
April1st to 15thNight
15%8%36%433346%39%
1797
16th to endNight
21%7%25%433345%38%
1766
May1st to 15thNight
15%6%35%42446%7%39%
1506
16th to endNight
10%5%26%5%3445%7%43%
1496
June1st to 15thNight
10%5%244245%5%10%43%
1440
16th to endNight
9%3234245%6%8%48%
1440
July1st to 15thNight
6%212215%46%8%56%
1440
16th to endNight
5%21442446%9%54%
1555
August1st to 15thNight
5%22442447%8%52%
1620
16th to endNight
9%424434346%53%
1857
September1st to 15thNight
9%314413336%57%
1800
16th to endNight
7%5%13424338%54%
1962
October1st to 15thNight
14%5%25%5%23235%49%
2160
16th to endNight
14%8%34423345%44%
2317
November1st to 15thNight
11%7%25%423335%49%
2309
16th to endNight
17%8%25%424346%40%
2520
December1st to 15thNight
17%12%5%6%6%34445%29%
2520
16th to endNight
21%12%47%6%34345%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
10%11%5%7%6%46%5%45%29%
1432
16th to endDay
13%10%7%10%8%35%5%5%6%22%
1702
February1st to 15thDay
11%11%7%8%6%24446%31%
1575
16th to endDay
14%8%36%5%35%5%5%6%35%
1518
March1st to 15thDay
16%8%37%5%34447%35%
1923
16th to endDay
18%10%46%42445%7%30%
2149
April1st to 15thDay
18%9%36%4335%5%7%32%
2151
16th to endDay
24%10%26%434346%30%
2193
May1st to 15thDay
19%8%36%6%3446%6%31%
2445
16th to endDay
15%5%26%5%35%45%7%37%
2617
June1st to 15thDay
14%5%344345%5%8%40%
2520
16th to endDay
10%425%5%35%5%6%8%42%
2520
July1st to 15thDay
7%425%435%5%6%8%45%
2520
16th to endDay
7%3245%25%6%8%10%43%
2610
August1st to 15thDay
9%5%245%245%7%8%44%
2340
16th to endDay
12%5%25%4345%5%8%42%
2344
September1st to 15thDay
12%413323446%52%
2160
16th to endDay
13%425%5%235%46%46%
1982
October1st to 15thDay
17%6%24423246%44%
1800
16th to endDay
17%7%25%42435%6%40%
1905
November1st to 15thDay
14%6%34432446%46%
1549
16th to endDay
16%9%36%433345%38%
1440
December1st to 15thDay
18%13%5%9%6%34445%27%
1440
16th to endDay
19%15%5%9%7%34225%23%
1536
January1st to 15thNight
11%10%47%6%34447%35%
2506
16th to endNight
11%10%5%10%6%34347%31%
2520
February1st to 15thNight
10%11%48%6%2435%5%35%
2278
16th to endNight
12%8%26%6%24436%41%
1955
March1st to 15thNight
15%8%25%423235%46%
2046
16th to endNight
17%9%37%5%35%45%6%31%
2073
April1st to 15thNight
16%8%35%5%24446%38%
1797
16th to endNight
21%7%25%5%3335%438%
1766
May1st to 15thNight
15%6%35%4245%6%7%39%
1505
16th to endNight
10%5%25%5%35%447%44%
1496
June1st to 15thNight
10%6%24425%46%9%43%
1440
16th to endNight
9%3144245%6%8%48%
1440
July1st to 15thNight
5%212325%46%8%56%
1440
16th to endNight
421442445%9%54%
1555
August1st to 15thNight
5%31342447%8%52%
1620
16th to endNight
10%414424346%53%
1857
September1st to 15thNight
10%314423245%57%
1800
16th to endNight
8%414424337%55%
1962
October1st to 15thNight
14%6%25%423236%49%
2160
16th to endNight
14%8%34423445%44%
2317
November1st to 15thNight
11%6%25%423435%48%
2309
16th to endNight
16%9%34324446%41%
2520
December1st to 15thNight
17%12%47%5%34445%29%
2520
16th to endNight
20%13%5%7%5%34345%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%5%13%15%10%
1433
16th to endDay
60%5%14%14%5%
1702
February1st to 15thDay
53%414%21%6%
1576
16th to endDay
48%6%13%22%7%1
1518
March1st to 15thDay
49%415%21%9%
1923
16th to endDay
54%6%12%20%5%
2151
April1st to 15thDay
51%5%12%22%8%
2151
16th to endDay
55%412%18%8%1
2193
May1st to 15thDay
52%6%12%20%7%
2445
16th to endDay
45%6%13%21%11%1
2621
June1st to 15thDay
40%7%14%23%13%
2520
16th to endDay
37%7%13%24%15%1
2520
July1st to 15thDay
35%7%14%26%13%2
2371
16th to endDay
32%9%18%23%14%1
2446
August1st to 15thDay
35%7%13%29%12%1
2326
16th to endDay
38%7%11%27%13%1
2344
September1st to 15thDay
32%5%12%30%18%1
2160
16th to endDay
37%5%12%30%13%1
1982
October1st to 15thDay
42%311%25%17%1
1800
16th to endDay
43%414%23%12%
1905
November1st to 15thDay
38%5%10%28%14%1
1549
16th to endDay
47%5%17%22%5%
1440
December1st to 15thDay
60%412%15%5%1
1440
16th to endDay
65%411%12%6%
1536
January1st to 15thNight
49%414%19%11%
2506
16th to endNight
54%415%17%8%
2520
February1st to 15thNight
49%5%13%21%9%
2288
16th to endNight
43%413%25%10%2
1955
March1st to 15thNight
41%312%27%12%1
2046
16th to endNight
53%5%14%18%7%
2073
April1st to 15thNight
45%410%24%12%2
1797
16th to endNight
47%5%10%21%12%2
1766
May1st to 15thNight
43%6%12%23%13%
1506
16th to endNight
38%6%13%23%15%2
1498
June1st to 15thNight
35%7%14%25%15%2
1440
16th to endNight
31%6%12%25%19%4
1440
July1st to 15thNight
23%7%16%30%16%4
1360
16th to endNight
25%6%17%30%17%2
1456
August1st to 15thNight
26%6%14%32%16%2
1610
16th to endNight
31%5%13%27%17%5%
1857
September1st to 15thNight
29%49%29%25%1
1800
16th to endNight
29%411%33%19%1
1962
October1st to 15thNight
38%39%24%21%2
2160
16th to endNight
41%413%23%15%1
2317
November1st to 15thNight
37%412%24%17%3
2309
16th to endNight
44%414%26%8%
2520
December1st to 15thNight
56%412%18%7%
2520
16th to endNight
61%411%14%7%
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
27%8%30%30%12
90
16th to endDay
21%9%28%26%12%2
96
February1st to 15thDay
11%24%34%21%8%
90
16th to endDay
20%11%39%14%13%
81
March1st to 15thDay
16%20%43%13%6%
90
16th to endDay
37%7%23%22%7%1
135
April1st to 15thDay
20%11%31%24%11%
270
16th to endDay
29%11%29%16%11%1
303
May1st to 15thDay
22%12%28%25%8%1
468
16th to endDay
17%10%29%26%14%2
517
June1st to 15thDay
12%427%32%19%3
495
16th to endDay
9%6%31%30%16%4
495
July1st to 15thDay
6%125%34%21%10%
475
16th to endDay
8%219%36%28%5%
515
August1st to 15thDay
10%220%33%26%7%
493
16th to endDay
13%319%30%25%8%
384
September1st to 15thDay
10%221%30%26%7%
315
16th to endDay
11%5%29%32%16%4
225
October1st to 15thDay
19%11%35%18%10%4
135
16th to endDay
18%9%40%24%6%
144
November1st to 15thDay
6%5%32%36%11%7%
90
16th to endDay
42%10%27%14%5%
90
December1st to 15thDay
24%18%33%18%4
90
16th to endDay
28%14%37%15%4
96
January1st to 15thNight
15%12%34%27%9%
900
16th to endNight
17%9%37%30%4
960
February1st to 15thNight
16%10%37%27%7%
880
16th to endNight
15%10%35%30%6%1
693
March1st to 15thNight
18%9%33%26%10%
606
16th to endNight
22%8%33%27%7%1
576
April1st to 15thNight
18%12%36%26%5%
539
16th to endNight
22%7%31%29%7%1
540
May1st to 15thNight
17%7%34%30%9%
540
16th to endNight
12%5%30%36%14%
563
June1st to 15thNight
13%325%41%14%
540
16th to endNight
10%228%41%16%
540
July1st to 15thNight
6%115%44%29%3
510
16th to endNight
5%115%45%29%2
564
August1st to 15thNight
6%113%43%31%2
539
16th to endNight
10%117%39%25%5%
573
September1st to 15thNight
11%315%40%24%5%
540
16th to endNight
8%427%34%22%2
612
October1st to 15thNight
17%6%30%28%14%1
720
16th to endNight
18%10%29%30%9%
768
November1st to 15thNight
14%9%36%29%10%
733
16th to endNight
19%10%38%23%8%
900
December1st to 15thNight
22%11%35%24%5%
900
16th to endNight
26%7%31%26%7%
960
Page generated at 2017-11-01 16:23:32. Version ac04

Copyright 2017 A. Danko


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