Innisfail
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Innisfail 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
42%
15191
12%
46851
8%
15164
46%
15164
20%
32748

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
34%
895
11%
2685
7%
895
36%
895
14%
2055
January16th to endNight
37%
849
17%
2769
12%
849
44%
849
18%
1925
February1st to 15thNight
40%
700
12%
2428
11%
698
45%
698
16%
1711
February16th to endNight
44%
632
12%
1991
11%
632
47%
632
19%
1406
March1st to 15thNight
40%
720
12%
2118
8%
720
45%
720
19%
1551
March16th to endNight
37%
768
11%
2082
5%
767
41%
767
18%
1595
April1st to 15thNight
33%
617
11%
1697
5%
617
37%
617
17%
1280
April16th to endNight
38%
540
11%
1620
9%
540
41%
540
18%
1170
May1st to 15thNight
40%
398
9%
1368
8%
398
44%
398
20%
903
May16th to endNight
43%
374
4%
1309
2%
374
44%
374
16%
913
June1st to 15thNight
42%
360
0%
1260
0%
360
42%
360
14%
942
June16th to endNight
50%
360
0%
1260
0%
360
50%
360
18%
864
July1st to 15thNight
60%
340
0%
1190
0%
340
60%
340
22%
758
July16th to endNight
61%
376
6%
1248
5%
354
62%
354
26%
739
August1st to 15thNight
64%
384
7%
1456
11%
382
64%
382
22%
903
August16th to endNight
61%
573
16%
1719
14%
573
64%
573
32%
1035
September1st to 15thNight
55%
651
16%
1797
11%
651
56%
651
30%
1133
September16th to endNight
51%
688
19%
1903
12%
688
55%
688
34%
1191
October1st to 15thNight
46%
660
14%
1957
9%
660
51%
660
23%
1337
October16th to endNight
44%
704
15%
2288
10%
704
50%
704
21%
1537
November1st to 15thNight
37%
842
17%
2426
12%
842
43%
842
21%
1702
November16th to endNight
32%
900
11%
2700
7%
900
36%
900
17%
1973
December1st to 15thNight
35%
900
12%
2700
9%
900
37%
900
15%
2055
December16th to endNight
38%
960
15%
2880
10%
960
43%
960
19%
2070

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%9%47%6%35%5%6%8%32%
48089
Night
8%10%47%7%35%5%6%8%31%
47002
TransparencyDay
47%7%17%20%6%
47741
Night
48%7%15%20%7%1
46855
SeeingDay
16%5%23%31%18%5%
6075
Night
13%426%36%16%2
15202

By Month

Percentage Cloud Cover NW (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
7%14%6%8%6%35%448%28%
1253
16th to endDay
7%11%6%8%7%36%6%6%7%29%
1464
February1st to 15thDay
6%13%7%8%6%45%5%5%9%27%
1435
16th to endDay
5%11%7%10%7%46%7%6%8%24%
1482
March1st to 15thDay
6%11%6%9%8%45%6%6%7%26%
1842
16th to endDay
10%14%6%8%6%46%46%7%25%
2135
April1st to 15thDay
11%13%5%7%7%36%6%5%7%25%
2250
16th to endDay
15%11%47%6%35%45%7%28%
2340
May1st to 15thDay
10%8%37%5%36%5%7%8%33%
2580
16th to endDay
20%7%25%5%35%5%7%8%27%
2802
June1st to 15thDay
16%8%36%6%36%6%7%8%25%
2700
16th to endDay
14%6%26%6%36%6%6%9%30%
2700
July1st to 15thDay
11%5%25%5%35%5%7%10%37%
2700
16th to endDay
9%424435%46%10%42%
2834
August1st to 15thDay
12%5%244345%7%11%38%
2496
16th to endDay
9%414426%5%7%7%45%
2483
September1st to 15thDay
15%6%2442335%6%44%
2160
16th to endDay
9%6%245%35%46%9%42%
1893
October1st to 15thDay
13%8%46%6%3445%7%33%
1672
16th to endDay
9%10%37%5%35%46%7%35%
1584
November1st to 15thDay
6%12%6%8%7%35%5%6%7%29%
1420
16th to endDay
7%12%5%10%7%35%447%30%
1260
December1st to 15thDay
5%15%7%11%9%5%5%45%5%23%
1260
16th to endDay
411%5%12%8%46%6%5%8%25%
1344
January1st to 15thNight
7%12%6%10%9%46%5%6%7%23%
2685
16th to endNight
5%14%5%8%6%35%5%6%8%29%
2769
February1st to 15thNight
7%12%5%10%7%35%5%48%28%
2418
16th to endNight
5%12%5%8%8%46%5%5%7%29%
1991
March1st to 15thNight
6%9%5%8%8%5%7%6%7%9%25%
2118
16th to endNight
6%13%7%10%7%45%5%6%8%24%
2082
April1st to 15thNight
11%12%6%8%7%35%5%5%8%26%
1697
16th to endNight
12%10%46%7%36%45%7%30%
1620
May1st to 15thNight
11%9%36%6%35%6%5%7%34%
1367
16th to endNight
19%7%35%6%335%7%7%29%
1309
June1st to 15thNight
15%8%37%7%36%6%6%8%24%
1260
16th to endNight
12%6%25%8%46%6%6%8%31%
1260
July1st to 15thNight
8%327%7%246%7%10%38%
1260
16th to endNight
7%3245%25%6%7%10%43%
1332
August1st to 15thNight
9%5%246%445%6%10%40%
1464
16th to endNight
8%425%4345%6%10%45%
1719
September1st to 15thNight
12%5%15%32446%7%44%
1797
16th to endNight
10%5%2443446%7%46%
1903
October1st to 15thNight
10%8%47%5%35%47%7%34%
1957
16th to endNight
7%9%46%7%35%47%9%34%
2288
November1st to 15thNight
7%11%47%6%46%5%5%7%33%
2426
16th to endNight
5%13%7%10%7%45%45%8%28%
2700
December1st to 15thNight
6%13%6%10%8%46%45%6%26%
2700
16th to endNight
412%5%10%9%36%6%5%8%27%
2880

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%413%21%6%
1253
16th to endDay
52%5%14%14%9%2
1464
February1st to 15thDay
51%7%14%17%6%1
1435
16th to endDay
53%8%13%18%6%
1482
March1st to 15thDay
54%7%17%14%6%
1842
16th to endDay
56%6%13%17%5%
2136
April1st to 15thDay
55%8%13%16%5%
2250
16th to endDay
53%6%13%18%7%1
2340
May1st to 15thDay
45%6%14%23%10%
2580
16th to endDay
51%7%16%17%6%
2807
June1st to 15thDay
52%8%15%19%4
2700
16th to endDay
47%10%17%20%3
2700
July1st to 15thDay
40%9%24%22%3
2541
16th to endDay
35%9%24%25%5%
2656
August1st to 15thDay
38%9%25%21%5%
2479
16th to endDay
32%8%24%25%8%1
2483
September1st to 15thDay
39%5%17%22%11%2
2160
16th to endDay
36%7%15%27%10%2
1893
October1st to 15thDay
48%6%15%21%7%
1672
16th to endDay
46%7%14%23%7%
1584
November1st to 15thDay
51%7%13%18%7%1
1420
16th to endDay
53%6%15%15%7%1
1260
December1st to 15thDay
60%6%13%15%4
1260
16th to endDay
54%5%13%17%7%
1344
January1st to 15thNight
58%6%12%15%5%2
2685
16th to endNight
50%5%13%18%9%2
2769
February1st to 15thNight
52%413%20%7%1
2429
16th to endNight
51%5%14%16%11%1
1991
March1st to 15thNight
50%8%16%18%5%
2118
16th to endNight
55%6%12%18%5%
2085
April1st to 15thNight
54%7%12%17%8%
1697
16th to endNight
52%6%12%21%5%1
1620
May1st to 15thNight
45%6%15%20%10%
1368
16th to endNight
49%8%16%17%7%1
1309
June1st to 15thNight
55%8%13%16%4
1260
16th to endNight
46%9%17%19%5%
1260
July1st to 15thNight
38%11%21%24%3
1190
16th to endNight
31%11%22%25%8%
1248
August1st to 15thNight
37%11%24%21%5%
1456
16th to endNight
32%7%19%28%9%1
1719
September1st to 15thNight
36%7%15%25%12%3
1797
16th to endNight
35%5%16%26%12%3
1903
October1st to 15thNight
45%6%16%21%9%1
1957
16th to endNight
44%7%18%22%7%
2288
November1st to 15thNight
46%7%12%22%9%1
2426
16th to endNight
53%6%15%14%7%2
2700
December1st to 15thNight
57%6%12%18%4
2700
16th to endNight
52%5%13%21%6%
2880

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
13%320%30%21%11%
60
16th to endDay
14%25%21%25%14%
64
February1st to 15thDay
13%7%16%37%17%7%
67
16th to endDay
14%419%38%19%3
141
March1st to 15thDay
9%5%34%37%10%2
270
16th to endDay
15%430%32%14%3
288
April1st to 15thDay
18%9%29%28%11%2
269
16th to endDay
23%8%25%24%15%2
270
May1st to 15thDay
13%9%23%27%20%5%
399
16th to endDay
23%315%31%21%4
517
June1st to 15thDay
19%7%20%34%14%3
495
16th to endDay
15%424%31%18%5%
495
July1st to 15thDay
14%219%32%23%7%
475
16th to endDay
10%420%34%24%6%
503
August1st to 15thDay
15%318%30%22%9%
315
16th to endDay
9%423%35%20%6%
332
September1st to 15thDay
24%322%25%19%4
315
16th to endDay
11%9%28%29%15%6%
284
October1st to 15thDay
21%6%32%22%13%3
148
16th to endDay
21%313%39%17%4
96
November1st to 15thDay
15%25%43%12%3
88
16th to endDay
11%6%23%26%16%15%
60
December1st to 15thDay
13%33%30%18%5%
60
16th to endDay
6%426%28%31%3
64
January1st to 15thNight
14%7%27%35%12%2
900
16th to endNight
12%7%28%36%13%3
849
February1st to 15thNight
12%7%23%36%17%2
704
16th to endNight
11%324%36%20%3
632
March1st to 15thNight
10%232%38%13%2
720
16th to endNight
13%327%39%13%2
768
April1st to 15thNight
16%7%28%31%15%
617
16th to endNight
17%6%27%35%12%1
540
May1st to 15thNight
15%5%27%32%17%1
399
16th to endNight
23%322%33%15%1
375
June1st to 15thNight
20%225%31%18%2
360
16th to endNight
15%324%33%22%1
360
July1st to 15thNight
13%13%44%27%
340
16th to endNight
8%218%44%24%1
376
August1st to 15thNight
13%11%38%32%3
384
16th to endNight
10%218%42%24%1
573
September1st to 15thNight
16%217%40%20%2
651
16th to endNight
13%326%36%18%2
688
October1st to 15thNight
15%324%36%16%2
660
16th to endNight
12%5%27%40%12%1
704
November1st to 15thNight
13%5%32%34%11%2
842
16th to endNight
11%5%35%33%12%2
900
December1st to 15thNight
13%7%29%31%15%2
900
16th to endNight
10%429%36%16%3
960
Page generated at 2017-09-24 07:15:56. Version ac04

Copyright 2017 A. Danko


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