Crex Meadows
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Crex Meadows clear sky chart from 2005-11-06 to 2024-01-16.

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
36%
24918
15%
74514
9%
24858
42%
24858
21%
51584

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 10thNight
29%
950
12%
2648
6%
946
34%
946
18%
1966
January11th to 20thNight
24%
930
10%
2603
6%
930
27%
930
15%
2019
January21st to endNight
24%
990
11%
2628
3%
990
30%
990
15%
2089
February1st to 10thNight
27%
900
14%
2340
3%
900
34%
900
22%
1690
February11th to 20thNight
29%
879
16%
2274
5%
875
36%
875
23%
1622
February21st to endNight
28%
671
15%
1855
5%
671
35%
671
19%
1362
March1st to 10thNight
31%
644
14%
2084
10%
644
36%
644
18%
1440
March11th to 20thNight
30%
540
19%
1980
12%
540
42%
540
20%
1278
March21st to endNight
34%
594
17%
2128
14%
594
42%
594
18%
1438
April1st to 10thNight
28%
540
14%
1800
10%
540
36%
540
17%
1254
April11th to 20thNight
32%
533
16%
1775
12%
533
40%
533
17%
1251
April21st to endNight
32%
540
15%
1620
9%
540
39%
540
19%
1161
May1st to 10thNight
32%
540
13%
1463
7%
540
36%
540
21%
1066
May11th to 20thNight
42%
531
17%
1417
9%
531
45%
531
28%
952
May21st to endNight
46%
584
13%
1552
6%
582
49%
582
28%
1024
June1st to 10thNight
50%
540
12%
1440
5%
540
53%
540
32%
927
June11th to 20thNight
49%
540
13%
1434
5%
540
52%
540
32%
927
June21st to endNight
54%
540
15%
1260
8%
540
56%
540
35%
833
July1st to 10thNight
66%
525
17%
1346
9%
525
67%
525
44%
792
July11th to 20thNight
57%
522
18%
1392
9%
522
60%
522
39%
850
July21st to endNight
68%
591
21%
1487
12%
558
70%
558
46%
840
August1st to 10thNight
67%
537
20%
1547
16%
534
69%
534
38%
894
August11th to 20thNight
57%
534
21%
1600
19%
534
63%
534
32%
970
August21st to endNight
57%
594
21%
1902
22%
594
60%
594
33%
1116
September1st to 10thNight
58%
540
21%
1800
22%
540
63%
540
32%
1027
September11th to 20thNight
53%
540
23%
1800
20%
540
61%
540
33%
1015
September21st to endNight
38%
634
19%
2057
12%
634
47%
634
26%
1273
October1st to 10thNight
41%
720
20%
2160
12%
720
47%
720
28%
1354
October11th to 20thNight
30%
720
18%
2160
9%
720
37%
720
21%
1487
October21st to endNight
33%
792
15%
2449
9%
792
38%
792
18%
1726
November1st to 10thNight
31%
845
18%
2511
10%
845
40%
845
21%
1716
November11th to 20thNight
27%
950
14%
2660
6%
950
34%
950
17%
1979
November21st to endNight
27%
950
15%
2660
6%
950
35%
950
20%
1892
December1st to 10thNight
26%
950
8%
2660
4%
950
30%
950
14%
2053
December11th to 20thNight
20%
948
10%
3207
3%
948
26%
948
11%
2480
December21st to endNight
19%
1040
6%
4815
3%
1026
25%
1026
7%
3821

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%9%47%6%35%5%5%7%36%
74981
Night
13%9%47%6%35%45%6%37%
74837
TransparencyDay
46%7%14%22%10%1
74681
Night
46%7%13%22%11%1
74657
SeeingDay
16%10%30%26%14%4
14891
Night
16%8%31%32%11%1
24925

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 10thDay
10%11%7%9%9%46%5%5%5%30%
1517
11th to 20thDay
11%14%8%13%8%45%5%46%21%
1485
21st to endDay
10%14%6%13%6%46%5%7%7%20%
1726
February1st to 10thDay
9%11%49%7%45%448%34%
1620
11th to 20thDay
8%12%5%8%6%35%45%8%34%
1574
21st to endDay
12%12%311%7%45%447%32%
1399
March1st to 10thDay
12%13%5%7%6%445%5%6%33%
1890
11th to 20thDay
14%9%46%6%35%5%46%37%
1980
21st to endDay
19%11%47%5%35%45%6%31%
2227
April1st to 10thDay
16%10%47%6%35%5%5%6%33%
2160
11th to 20thDay
21%12%37%5%34347%30%
2134
21st to endDay
22%9%37%6%46%446%30%
2336
May1st to 10thDay
17%9%37%6%36%45%7%34%
2497
11th to 20thDay
16%7%36%6%35%5%5%7%36%
2479
21st to endDay
14%7%37%5%35%5%5%7%38%
2725
June1st to 10thDay
12%5%25%5%345%6%8%45%
2520
11th to 20thDay
12%7%36%6%35%5%5%8%39%
2520
21st to endDay
11%4246%36%7%8%11%39%
2696
July1st to 10thDay
6%4235%35%5%7%10%50%
2566
11th to 20thDay
9%5%25%5%3446%9%48%
2520
21st to endDay
8%4245%35%6%7%9%49%
2743
August1st to 10thDay
9%5%26%6%36%6%6%9%42%
2380
11th to 20thDay
13%5%25%5%45%45%7%44%
2301
21st to endDay
11%5%25%5%3445%8%49%
2453
September1st to 10thDay
11%5%25%5%345%6%8%45%
2160
11th to 20thDay
13%5%26%5%346%5%7%44%
2160
21st to endDay
17%6%25%5%2445%8%41%
1882
October1st to 10thDay
18%8%25%5%345%7%7%37%
1800
11th to 20thDay
19%11%37%6%35%445%34%
1800
21st to endDay
20%11%35%6%44346%33%
1906
November1st to 10thDay
13%12%5%7%7%25%45%7%34%
1564
11th to 20thDay
14%14%7%10%8%4445%6%25%
1520
21st to endDay
15%13%37%6%2446%6%33%
1520
December1st to 10thDay
10%15%6%11%10%36%5%5%6%23%
1520
11th to 20thDay
13%13%8%10%8%445%45%25%
1918
21st to endDay
25%17%6%11%7%3333418%
2783
January1st to 10thNight
10%9%6%11%8%47%5%5%5%31%
2648
11th to 20thNight
10%13%6%11%9%4445%6%27%
2603
21st to endNight
12%14%7%11%7%45%5%5%6%24%
2628
February1st to 10thNight
6%11%5%9%7%45%5%5%6%36%
2340
11th to 20thNight
7%10%5%9%6%45%5%5%6%37%
2273
21st to endNight
13%12%47%7%46%45%6%33%
1855
March1st to 10thNight
12%10%48%7%35%5%5%6%36%
2084
11th to 20thNight
12%11%37%6%34445%42%
1980
21st to endNight
17%10%5%7%5%2335%6%37%
2128
April1st to 10thNight
19%9%46%6%3445%5%35%
1800
11th to 20thNight
23%10%46%5%24445%34%
1775
21st to endNight
20%10%36%5%35%45%6%33%
1620
May1st to 10thNight
16%8%47%6%35%45%7%35%
1463
11th to 20thNight
14%6%25%43446%8%42%
1416
21st to endNight
13%6%25%5%35%6%7%8%42%
1551
June1st to 10thNight
10%5%246%36%5%6%10%43%
1440
11th to 20thNight
11%5%25%5%36%46%8%45%
1434
21st to endNight
7%5%25%5%45%6%7%8%47%
1260
July1st to 10thNight
43244345%7%9%55%
1386
11th to 20thNight
7%5%245%35%5%6%8%52%
1440
21st to endNight
5%324325%47%8%58%
1575
August1st to 10thNight
6%435%5%245%6%10%51%
1556
11th to 20thNight
14%5%2442346%6%49%
1600
21st to endNight
11%425%5%3435%6%51%
1902
September1st to 10thNight
9%5%245%345%47%53%
1800
11th to 20thNight
10%5%145%2445%8%53%
1800
21st to endNight
16%435%5%34447%45%
2057
October1st to 10thNight
16%7%24434447%45%
2160
11th to 20thNight
17%9%46%5%24446%38%
2160
21st to endNight
18%9%47%5%3445%6%34%
2449
November1st to 10thNight
15%9%46%5%35%45%7%38%
2511
11th to 20thNight
15%10%6%10%6%35%445%31%
2660
21st to endNight
14%9%48%6%35%45%6%36%
2660
December1st to 10thNight
10%14%6%11%8%45%5%47%26%
2660
11th to 20thNight
12%15%6%10%8%5%5%5%45%25%
3279
21st to endNight
25%19%5%8%6%33335%21%
4884

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 10thDay
55%7%12%19%6%1
1518
11th to 20thDay
64%7%9%12%8%
1485
21st to endDay
61%6%12%14%7%
1726
February1st to 10thDay
50%5%14%21%9%1
1620
11th to 20thDay
48%6%14%23%8%1
1583
21st to endDay
54%5%10%19%11%1
1399
March1st to 10thDay
52%7%14%19%8%1
1890
11th to 20thDay
48%6%15%21%9%1
1980
21st to endDay
54%6%11%21%8%1
2227
April1st to 10thDay
51%6%12%18%12%1
2160
11th to 20thDay
55%5%10%17%11%1
2134
21st to endDay
56%6%11%18%9%
2336
May1st to 10thDay
49%8%12%22%8%1
2497
11th to 20thDay
47%7%13%21%11%1
2483
21st to endDay
45%8%11%24%11%1
2725
June1st to 10thDay
36%7%17%28%10%1
2520
11th to 20thDay
41%7%16%22%13%1
2520
21st to endDay
36%9%20%26%9%1
2696
July1st to 10thDay
27%10%17%31%16%
2497
11th to 20thDay
31%9%16%26%16%2
2445
21st to endDay
29%9%18%28%15%1
2591
August1st to 10thDay
35%9%17%27%9%3
2365
11th to 20thDay
38%8%15%28%11%
2301
21st to endDay
33%8%14%30%14%2
2453
September1st to 10thDay
36%8%14%31%10%
2160
11th to 20thDay
36%9%18%29%7%
2160
21st to endDay
42%7%14%31%7%
1882
October1st to 10thDay
42%8%14%27%8%
1800
11th to 20thDay
52%7%11%19%10%1
1800
21st to endDay
52%6%13%21%8%
1906
November1st to 10thDay
50%7%13%19%11%1
1564
11th to 20thDay
60%7%13%14%7%1
1520
21st to endDay
51%7%16%19%5%2
1520
December1st to 10thDay
63%7%14%13%4
1520
11th to 20thDay
59%8%13%15%41
1915
21st to endDay
71%5%8%9%7%
2783
January1st to 10thNight
53%6%12%19%8%1
2648
11th to 20thNight
58%7%13%14%7%1
2603
21st to endNight
60%6%10%15%7%1
2628
February1st to 10thNight
48%7%13%22%10%1
2340
11th to 20thNight
46%7%14%23%8%2
2274
21st to endNight
53%6%12%19%10%1
1855
March1st to 10thNight
49%7%14%21%9%1
2084
11th to 20thNight
46%5%12%22%15%1
1980
21st to endNight
50%5%12%22%11%1
2128
April1st to 10thNight
49%7%7%18%16%2
1800
11th to 20thNight
53%5%8%20%13%2
1775
21st to endNight
51%7%10%19%13%1
1620
May1st to 10thNight
48%8%12%18%13%1
1463
11th to 20thNight
40%8%13%24%13%2
1417
21st to endNight
37%9%15%23%15%2
1552
June1st to 10thNight
34%9%16%28%11%2
1440
11th to 20thNight
36%7%15%20%20%1
1434
21st to endNight
31%11%15%28%12%3
1260
July1st to 10thNight
23%9%16%33%18%1
1346
11th to 20thNight
29%8%13%31%15%4
1392
21st to endNight
21%9%17%31%18%3
1487
August1st to 10thNight
27%8%16%30%14%5%
1547
11th to 20thNight
33%8%16%27%15%2
1600
21st to endNight
33%6%13%28%17%2
1902
September1st to 10thNight
30%8%14%33%14%1
1800
11th to 20thNight
30%7%17%33%13%
1800
21st to endNight
39%6%13%31%11%1
2057
October1st to 10thNight
39%6%12%30%12%2
2160
11th to 20thNight
46%8%12%23%11%1
2160
21st to endNight
49%7%13%20%9%1
2449
November1st to 10thNight
46%6%13%23%11%1
2511
11th to 20thNight
55%6%13%16%9%
2660
21st to endNight
48%7%17%21%6%1
2660
December1st to 10thNight
57%7%14%16%5%
2660
11th to 20thNight
59%8%12%16%5%1
3281
21st to endNight
67%6%10%14%4
4884

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 10thDay
14%10%37%26%9%4
270
11th to 20thDay
15%10%39%28%8%
257
21st to endDay
17%9%41%18%13%2
264
February1st to 10thDay
14%15%44%24%3
240
11th to 20thDay
14%17%42%18%7%2
240
21st to endDay
18%14%43%23%3
198
March1st to 10thDay
20%13%37%19%10%2
240
11th to 20thDay
18%12%38%22%9%2
240
21st to endDay
25%14%28%19%12%3
313
April1st to 10thDay
21%15%35%21%7%
420
11th to 20thDay
27%10%27%25%10%1
412
21st to endDay
26%11%31%20%10%3
596
May1st to 10thDay
19%15%30%25%9%2
603
11th to 20thDay
19%13%27%26%11%4
625
21st to endDay
18%11%25%24%18%4
679
June1st to 10thDay
11%6%28%31%19%5%
630
11th to 20thDay
11%9%36%30%12%3
630
21st to endDay
11%7%30%29%17%7%
630
July1st to 10thDay
8%422%31%24%11%
621
11th to 20thDay
9%6%28%27%21%9%
618
21st to endDay
7%326%35%21%8%
684
August1st to 10thDay
9%5%23%34%24%6%
626
11th to 20thDay
14%6%19%32%22%7%
615
21st to endDay
11%8%24%31%22%5%
572
September1st to 10thDay
12%6%27%33%17%5%
450
11th to 20thDay
12%6%29%30%20%4
450
21st to endDay
24%11%29%19%13%5%
284
October1st to 10thDay
19%10%31%19%14%8%
270
11th to 20thDay
19%19%31%25%6%1
270
21st to endDay
24%14%40%13%8%1
297
November1st to 10thDay
20%13%36%21%9%2
270
11th to 20thDay
19%17%37%20%7%
270
21st to endDay
22%12%39%21%6%
270
December1st to 10thDay
15%13%38%23%10%
270
11th to 20thDay
22%15%36%21%6%
270
21st to endDay
27%13%37%21%2
297
January1st to 10thNight
13%11%35%31%9%1
950
11th to 20thNight
17%8%37%29%8%1
930
21st to endNight
18%8%36%30%7%1
990
February1st to 10thNight
13%9%40%30%8%
900
11th to 20thNight
10%11%40%30%8%1
879
21st to endNight
19%10%34%28%8%1
671
March1st to 10thNight
16%11%34%29%8%1
644
11th to 20thNight
18%7%40%27%7%
540
21st to endNight
21%11%28%27%10%2
594
April1st to 10thNight
22%10%34%28%6%
540
11th to 20thNight
27%9%28%28%8%1
533
21st to endNight
25%6%29%31%8%1
540
May1st to 10thNight
19%11%33%31%6%1
540
11th to 20thNight
16%7%32%32%11%2
531
21st to endNight
15%6%27%37%14%1
584
June1st to 10thNight
10%5%29%42%13%1
540
11th to 20thNight
11%431%43%10%
540
21st to endNight
9%6%23%42%19%1
540
July1st to 10thNight
5%322%42%27%2
525
11th to 20thNight
8%328%41%20%1
522
21st to endNight
5%320%47%23%2
591
August1st to 10thNight
6%315%53%21%1
537
11th to 20thNight
14%419%35%26%2
534
21st to endNight
12%421%37%24%2
594
September1st to 10thNight
10%424%39%19%4
540
11th to 20thNight
11%428%37%18%2
540
21st to endNight
16%8%33%27%15%1
634
October1st to 10thNight
21%8%26%31%12%2
720
11th to 20thNight
20%12%33%29%6%
720
21st to endNight
23%9%28%31%8%
792
November1st to 10thNight
19%9%34%29%7%
845
11th to 20thNight
19%12%32%28%8%
950
21st to endNight
18%12%37%26%7%
950
December1st to 10thNight
17%11%31%31%8%1
950
11th to 20thNight
21%9%37%25%8%1
950
21st to endNight
26%9%34%25%6%
1045
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