Crex Meadows
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Crex Meadows clear sky chart from 2005-11-05 to 2017-10-06.

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%
16229
14%
46929
9%
16182
43%
16182
22%
32402

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
30%
900
11%
2506
7%
895
34%
895
18%
1867
January16th to endNight
24%
960
11%
2592
4%
960
30%
960
16%
2022
February1st to 15thNight
31%
879
14%
2286
4%
875
38%
875
22%
1651
February16th to endNight
29%
744
11%
2006
4%
744
34%
744
20%
1476
March1st to 15thNight
33%
609
13%
2049
10%
609
37%
609
19%
1381
March16th to endNight
33%
576
16%
2078
13%
576
42%
576
17%
1414
April1st to 15thNight
32%
539
15%
1797
12%
539
39%
539
18%
1240
April16th to endNight
32%
540
14%
1680
10%
540
38%
540
17%
1225
May1st to 15thNight
32%
540
13%
1455
6%
540
37%
540
21%
1062
May16th to endNight
45%
563
13%
1498
6%
561
48%
561
28%
988
June1st to 15thNight
48%
540
9%
1440
4%
540
50%
540
29%
971
June16th to endNight
54%
540
13%
1315
6%
540
56%
540
37%
841
July1st to 15thNight
60%
510
15%
1324
9%
510
62%
510
41%
799
July16th to endNight
65%
564
18%
1417
10%
531
67%
531
42%
839
August1st to 15thNight
67%
539
19%
1575
16%
536
69%
536
37%
917
August16th to endNight
55%
573
20%
1800
20%
573
59%
573
32%
1084
September1st to 15thNight
61%
540
21%
1800
21%
540
67%
540
36%
988
September16th to endNight
44%
600
18%
1973
13%
600
51%
600
28%
1198
October1st to 15thNight
42%
684
22%
2052
14%
684
48%
684
29%
1266
October16th to endNight
34%
704
14%
2157
8%
704
39%
704
19%
1509
November1st to 15thNight
32%
825
18%
2401
9%
825
39%
825
22%
1647
November16th to endNight
31%
900
14%
2520
8%
900
36%
900
17%
1877
December1st to 15thNight
23%
900
8%
2520
3%
900
27%
900
14%
1966
December16th to endNight
21%
960
9%
2688
3%
960
27%
960
12%
2174

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%8%36%5%3445%7%36%
48257
Night
13%8%36%5%34446%38%
47099
Cloud CoverDay
26%7%25%423446%31%
48268
Night
25%7%25%423345%34%
47103
Cloud CoverDay
14%8%36%5%3445%7%35%
48266
Night
13%8%36%5%24446%38%
47103
TransparencyDay
47%6%14%21%8%
47943
Night
46%6%13%22%10%1
46931
SeeingDay
17%6%28%26%15%4
6221
Night
17%6%30%32%12%1
16230

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
9%12%7%8%8%35%445%30%
1432
16th to endDay
11%14%6%12%6%35%45%6%22%
1630
February1st to 15thDay
8%12%5%7%6%35%35%7%33%
1575
16th to endDay
11%12%47%8%345%46%31%
1467
March1st to 15thDay
14%9%5%7%6%24445%34%
1909
16th to endDay
18%10%36%434446%31%
2145
April1st to 15thDay
17%9%37%42435%5%36%
2151
16th to endDay
23%9%27%5%35%445%29%
2277
May1st to 15thDay
20%8%37%6%44446%30%
2496
16th to endDay
15%6%36%5%35%5%5%6%37%
2617
June1st to 15thDay
16%7%3443445%8%37%
2520
16th to endDay
10%5%25%5%36%6%6%10%37%
2637
July1st to 15thDay
8%4244245%6%9%47%
2547
16th to endDay
7%4244245%6%9%47%
2655
August1st to 15thDay
9%425%5%35%5%6%9%41%
2374
16th to endDay
15%42442335%8%45%
2402
September1st to 15thDay
9%414435%46%7%48%
2160
16th to endDay
16%6%25%4245%47%40%
1974
October1st to 15thDay
16%9%24433446%39%
1706
16th to endDay
22%9%345%34336%33%
1713
November1st to 15thDay
14%13%46%5%13446%34%
1454
16th to endDay
17%10%47%6%35%46%6%28%
1440
December1st to 15thDay
15%13%7%9%8%245%45%22%
1440
16th to endDay
18%17%6%11%7%3433417%
1536
January1st to 15thNight
11%9%5%8%6%46%45%5%31%
2506
16th to endNight
13%12%6%10%6%34445%27%
2592
February1st to 15thNight
7%12%5%8%5%34445%37%
2285
16th to endNight
10%10%47%7%45%45%6%34%
2006
March1st to 15thNight
13%8%47%5%24445%39%
2037
16th to endNight
17%9%45%5%23345%37%
2078
April1st to 15thNight
20%9%35%5%24245%37%
1797
16th to endNight
23%8%36%5%33346%31%
1680
May1st to 15thNight
18%6%45%435%347%36%
1455
16th to endNight
12%5%344345%7%8%41%
1496
June1st to 15thNight
13%425%5%46%45%8%40%
1440
16th to endNight
9%4145%2346%8%48%
1315
July1st to 15thNight
44133245%6%8%53%
1404
16th to endNight
6%3133145%6%8%54%
1513
August1st to 15thNight
7%3234245%6%9%50%
1584
16th to endNight
12%5%24433346%50%
1800
September1st to 15thNight
8%313423446%55%
1800
16th to endNight
14%424433446%48%
1973
October1st to 15thNight
15%6%14313336%48%
2052
16th to endNight
20%8%35%423445%36%
2157
November1st to 15thNight
14%8%46%424346%38%
2401
16th to endNight
16%9%47%5%445%45%32%
2520
December1st to 15thNight
14%15%5%8%7%34345%26%
2520
16th to endNight
16%16%6%10%6%34446%21%
2688

Percentage Cloud Cover SW (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
23%10%5%7%6%24335%27%
1432
16th to endDay
25%12%5%10%5%34345%17%
1630
February1st to 15thDay
23%11%37%5%23346%28%
1575
16th to endDay
25%10%36%7%3333427%
1467
March1st to 15thDay
26%8%36%42344431%
1920
16th to endDay
32%8%25%423335%27%
2145
April1st to 15thDay
30%8%26%32324430%
2151
16th to endDay
36%8%26%5%23335%22%
2277
May1st to 15thDay
31%7%36%5%34435%24%
2496
16th to endDay
30%6%25%423445%30%
2617
June1st to 15thDay
31%6%24423346%30%
2520
16th to endDay
26%4245%345%5%8%31%
2637
July1st to 15thDay
24%31332345%7%39%
2547
16th to endDay
23%31433345%7%38%
2655
August1st to 15thDay
17%315%5%245%5%8%38%
2374
16th to endDay
21%414423347%42%
2402
September1st to 15thDay
17%4442445%6%43%
2160
16th to endDay
22%5%24423446%39%
1974
October1st to 15thDay
24%8%15%322445%36%
1706
16th to endDay
29%8%245%33235%32%
1713
November1st to 15thDay
26%11%16%313345%32%
1454
16th to endDay
30%9%27%5%34345%24%
1440
December1st to 15thDay
29%12%5%7%6%2342420%
1440
16th to endDay
29%15%5%10%7%2323315%
1536
January1st to 15thNight
24%8%47%5%35%34428%
2506
16th to endNight
27%11%49%5%2333423%
2592
February1st to 15thNight
22%11%37%42333432%
2278
16th to endNight
22%8%37%6%3433430%
2006
March1st to 15thNight
25%7%35%5%2433435%
2049
16th to endNight
30%8%3442223432%
2078
April1st to 15thNight
32%7%2442323332%
1797
16th to endNight
37%7%25%33232425%
1680
May1st to 15thNight
32%5%3442434430%
1454
16th to endNight
27%5%2432345%6%35%
1496
June1st to 15thNight
27%4145%35%446%34%
1440
16th to endNight
24%413423346%41%
1315
July1st to 15thNight
21%31332445%6%43%
1404
16th to endNight
22%31321345%7%46%
1513
August1st to 15thNight
15%3134235%5%8%47%
1584
16th to endNight
19%423422245%48%
1800
September1st to 15thNight
16%314422345%51%
1800
16th to endNight
20%313423336%46%
1973
October1st to 15thNight
22%6%14313335%44%
2052
16th to endNight
27%7%2442334434%
2157
November1st to 15thNight
25%7%26%324235%35%
2401
16th to endNight
29%8%36%5%3343427%
2520
December1st to 15thNight
28%13%47%5%3333422%
2520
16th to endNight
28%14%48%6%2333419%
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
9%12%7%8%7%35%445%29%
1432
16th to endDay
11%13%6%12%5%35%45%7%22%
1630
February1st to 15thDay
8%11%5%8%6%35%348%33%
1575
16th to endDay
12%11%39%6%45%445%31%
1467
March1st to 15thDay
13%11%5%6%5%34445%35%
1920
16th to endDay
18%10%36%5%25%446%31%
2143
April1st to 15thDay
17%8%37%5%34346%36%
2151
16th to endDay
22%9%36%6%35%446%28%
2277
May1st to 15thDay
20%8%37%6%35%446%30%
2496
16th to endDay
15%6%36%6%35%5%5%6%37%
2617
June1st to 15thDay
16%6%35%5%245%5%7%38%
2520
16th to endDay
11%425%6%36%6%6%9%37%
2637
July1st to 15thDay
8%4235%245%6%9%47%
2547
16th to endDay
7%4144345%6%8%47%
2655
August1st to 15thDay
10%425%5%36%6%5%9%41%
2374
16th to endDay
14%41442435%8%45%
2402
September1st to 15thDay
9%415%3345%5%8%47%
2160
16th to endDay
17%5%25%5%23447%40%
1974
October1st to 15thDay
17%9%25%42345%6%39%
1706
16th to endDay
22%9%346%34335%33%
1713
November1st to 15thDay
14%12%47%5%13445%35%
1454
16th to endDay
16%11%27%6%35%46%7%27%
1440
December1st to 15thDay
15%14%7%8%8%345%35%22%
1440
16th to endDay
18%17%7%11%8%3433417%
1536
January1st to 15thNight
11%9%5%8%6%46%35%5%31%
2506
16th to endNight
12%12%6%10%7%34445%27%
2592
February1st to 15thNight
7%12%5%8%6%34446%36%
2278
16th to endNight
9%10%48%8%35%45%5%34%
2006
March1st to 15thNight
12%9%47%5%24445%39%
2049
16th to endNight
17%10%46%423345%36%
2078
April1st to 15thNight
20%9%35%5%3324437%
1797
16th to endNight
23%8%35%424435%32%
1680
May1st to 15thNight
18%6%36%435%346%36%
1454
16th to endNight
12%6%244345%7%8%41%
1496
June1st to 15thNight
13%4246%36%449%40%
1440
16th to endNight
9%414425%46%8%48%
1315
July1st to 15thNight
5%32332446%8%53%
1404
16th to endNight
6%31331447%8%54%
1513
August1st to 15thNight
7%4234245%5%8%51%
1584
16th to endNight
12%4245%2425%6%50%
1800
September1st to 15thNight
8%413423446%56%
1800
16th to endNight
13%424433346%48%
1973
October1st to 15thNight
15%7%24313337%47%
2052
16th to endNight
20%8%36%423445%36%
2157
November1st to 15thNight
15%7%47%424346%38%
2401
16th to endNight
16%10%47%5%35%45%5%31%
2520
December1st to 15thNight
14%15%6%8%7%34336%26%
2520
16th to endNight
15%17%6%10%7%33445%21%
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
55%6%11%18%6%
1433
16th to endDay
61%6%14%14%4
1630
February1st to 15thDay
50%5%16%19%6%1
1576
16th to endDay
54%6%12%21%5%
1467
March1st to 15thDay
50%7%16%18%7%
1920
16th to endDay
53%6%13%20%5%
2145
April1st to 15thDay
49%412%19%12%1
2151
16th to endDay
57%5%10%15%9%
2277
May1st to 15thDay
55%7%11%18%7%
2496
16th to endDay
46%7%12%22%10%1
2621
June1st to 15thDay
44%5%16%24%7%
2520
16th to endDay
39%8%18%23%9%
2637
July1st to 15thDay
31%8%14%28%15%1
2398
16th to endDay
31%8%19%25%13%1
2488
August1st to 15thDay
35%8%16%27%9%1
2359
16th to endDay
37%7%15%26%12%1
2402
September1st to 15thDay
34%7%15%33%9%
2160
16th to endDay
42%7%15%28%6%
1974
October1st to 15thDay
45%5%13%23%11%
1706
16th to endDay
54%5%12%18%8%
1713
November1st to 15thDay
51%5%12%18%11%
1454
16th to endDay
54%8%16%13%5%1
1440
December1st to 15thDay
63%6%12%13%4
1440
16th to endDay
70%5%9%9%4
1536
January1st to 15thNight
53%7%11%20%6%
2506
16th to endNight
58%5%12%16%5%
2592
February1st to 15thNight
48%6%13%23%8%
2288
16th to endNight
51%6%13%20%7%
2006
March1st to 15thNight
47%6%15%20%10%
2049
16th to endNight
49%5%13%22%7%
2078
April1st to 15thNight
49%5%8%20%13%1
1797
16th to endNight
54%5%8%18%11%1
1680
May1st to 15thNight
49%7%12%18%11%
1455
16th to endNight
38%8%15%23%13%1
1498
June1st to 15thNight
40%6%15%23%11%2
1440
16th to endNight
32%7%16%25%15%2
1315
July1st to 15thNight
27%7%15%29%17%2
1324
16th to endNight
24%9%16%29%16%3
1417
August1st to 15thNight
29%6%16%28%14%4
1575
16th to endNight
35%5%13%26%15%2
1800
September1st to 15thNight
28%6%15%35%14%
1800
16th to endNight
37%5%15%30%10%
1973
October1st to 15thNight
37%5%12%30%12%1
2052
16th to endNight
49%6%13%19%10%
2157
November1st to 15thNight
47%411%22%11%
2401
16th to endNight
52%8%15%16%7%1
2520
December1st to 15thNight
60%5%13%16%3
2520
16th to endNight
64%5%12%11%4
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
21%7%34%23%10%3
90
16th to endDay
23%11%34%21%8%
96
February1st to 15thDay
12%15%46%21%4
90
16th to endDay
22%11%40%20%31
81
March1st to 15thDay
21%437%25%10%1
90
16th to endDay
27%9%27%26%9%
129
April1st to 15thDay
19%10%32%24%11%1
270
16th to endDay
28%8%31%21%9%1
387
May1st to 15thDay
21%15%28%25%6%2
468
16th to endDay
21%7%28%21%14%6%
517
June1st to 15thDay
16%7%30%27%14%3
495
16th to endDay
12%6%30%28%16%4
495
July1st to 15thDay
9%325%26%24%9%
475
16th to endDay
8%228%31%21%7%
515
August1st to 15thDay
11%322%33%24%4
493
16th to endDay
16%420%32%20%6%
442
September1st to 15thDay
9%224%36%20%6%
315
16th to endDay
21%5%31%25%14%1
204
October1st to 15thDay
12%12%33%18%14%9%
107
16th to endDay
26%9%34%15%14%
96
November1st to 15thDay
13%336%31%13%2
90
16th to endDay
37%7%27%20%6%
90
December1st to 15thDay
27%434%26%6%
90
16th to endDay
36%14%32%13%3
96
January1st to 15thNight
16%9%33%29%10%1
900
16th to endNight
18%7%37%30%6%
960
February1st to 15thNight
13%7%35%33%8%
880
16th to endNight
13%9%36%28%10%
744
March1st to 15thNight
17%9%33%29%9%1
609
16th to endNight
21%8%30%28%9%1
576
April1st to 15thNight
24%7%29%29%7%
539
16th to endNight
28%5%29%27%7%1
540
May1st to 15thNight
21%9%32%28%7%1
540
16th to endNight
14%430%34%13%1
563
June1st to 15thNight
13%5%28%40%11%
540
16th to endNight
10%425%41%17%
540
July1st to 15thNight
7%226%38%23%1
510
16th to endNight
7%221%45%21%1
564
August1st to 15thNight
7%214%48%24%2
539
16th to endNight
14%221%36%23%1
573
September1st to 15thNight
9%223%38%21%4
540
16th to endNight
14%5%31%28%18%1
600
October1st to 15thNight
21%7%26%31%11%1
684
16th to endNight
25%7%25%32%8%
704
November1st to 15thNight
18%9%33%29%8%
825
16th to endNight
20%11%31%27%9%
900
December1st to 15thNight
22%9%32%27%7%
900
16th to endNight
23%6%32%27%9%1
960
Page generated at 2017-10-07 13:07:56. Version ac04

Copyright 2017 A. Danko


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