Rexburg
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Rexburg 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
51%
23915
18%
74641
15%
23873
54%
23873
26%
47460

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
39%
851
8%
2741
7%
851
41%
851
14%
2112
January11th to 20thNight
39%
744
12%
2558
11%
744
41%
744
14%
1899
January21st to endNight
35%
792
10%
2574
9%
792
37%
792
13%
1982
February1st to 10thNight
35%
720
9%
2340
7%
720
39%
720
14%
1741
February11th to 20thNight
38%
702
11%
2273
10%
700
43%
700
18%
1614
February21st to endNight
35%
592
12%
1778
9%
592
38%
592
15%
1344
March1st to 10thNight
46%
720
14%
2061
12%
720
48%
720
21%
1473
March11th to 20thNight
46%
720
19%
1980
13%
720
52%
720
28%
1309
March21st to endNight
43%
792
12%
2178
9%
792
46%
792
20%
1572
April1st to 10thNight
46%
666
16%
1908
10%
666
51%
666
24%
1300
April11th to 20thNight
42%
533
20%
1601
13%
533
47%
533
25%
1044
April21st to endNight
50%
540
22%
1620
16%
540
54%
540
30%
991
May1st to 10thNight
51%
540
18%
1620
15%
540
53%
540
30%
988
May11th to 20thNight
54%
531
18%
1587
16%
531
57%
531
32%
939
May21st to endNight
50%
583
15%
1552
11%
582
53%
582
28%
1044
June1st to 10thNight
62%
414
17%
1314
15%
414
66%
414
31%
754
June11th to 20thNight
54%
360
22%
1260
19%
360
63%
360
33%
687
June21st to endNight
78%
360
29%
1260
32%
360
84%
360
54%
534
July1st to 10thNight
77%
350
28%
1225
33%
350
84%
350
54%
523
July11th to 20thNight
80%
356
31%
1376
40%
356
87%
356
60%
510
July21st to endNight
74%
591
29%
1674
27%
558
77%
558
55%
797
August1st to 10thNight
69%
537
27%
1602
23%
534
71%
534
45%
835
August11th to 20thNight
79%
534
35%
1602
28%
534
81%
534
57%
742
August21st to endNight
70%
594
38%
1782
30%
594
74%
594
53%
856
September1st to 10thNight
71%
612
32%
1854
27%
612
77%
612
50%
905
September11th to 20thNight
70%
720
32%
1980
26%
720
75%
720
49%
1061
September21st to endNight
68%
720
33%
1980
25%
720
72%
720
48%
1072
October1st to 10thNight
60%
720
23%
2088
18%
720
64%
720
37%
1207
October11th to 20thNight
58%
720
28%
2160
22%
720
63%
720
37%
1216
October21st to endNight
56%
792
23%
2459
19%
792
61%
792
31%
1466
November1st to 10thNight
52%
740
19%
2405
19%
740
55%
740
25%
1524
November11th to 20thNight
45%
892
16%
2602
12%
892
48%
892
23%
1767
November21st to endNight
48%
950
14%
2660
11%
950
51%
950
26%
1806
December1st to 10thNight
38%
950
9%
2660
6%
950
40%
950
17%
2005
December11th to 20thNight
35%
948
10%
3260
6%
948
37%
948
12%
2491
December21st to endNight
32%
1029
5%
5067
5%
1026
35%
1026
9%
3350

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
10%8%35%5%3445%6%47%
74731
Night
11%10%36%5%3445%6%44%
75062
TransparencyDay
37%5%11%22%17%8%
74437
Night
41%5%12%20%14%7%
74876
SeeingDay
13%9%23%30%20%6%
14186
Night
15%419%40%19%2
23940

By Month

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 10thDay
18%17%6%9%5%24445%25%
1438
11th to 20thDay
18%12%5%8%6%45%345%31%
1525
21st to endDay
17%17%6%10%5%2443427%
1782
February1st to 10thDay
17%14%5%10%6%35%445%28%
1620
11th to 20thDay
15%15%7%9%6%2445%5%29%
1575
21st to endDay
10%16%7%10%7%3435%6%30%
1476
March1st to 10thDay
10%14%5%8%6%3445%7%34%
1898
11th to 20thDay
9%10%48%5%35%6%5%7%38%
1980
21st to endDay
12%14%5%7%7%3445%6%30%
2178
April1st to 10thDay
12%13%46%5%445%6%7%34%
2049
11th to 20thDay
9%10%46%6%4445%7%41%
2307
21st to endDay
9%10%46%5%35%5%5%7%42%
2340
May1st to 10thDay
9%8%35%6%35%5%6%8%44%
2340
11th to 20thDay
8%7%35%6%45%5%6%8%44%
2306
21st to endDay
12%7%36%7%45%5%6%8%36%
2724
June1st to 10thDay
9%425%5%35%6%7%8%46%
2641
11th to 20thDay
11%5%245%2445%7%50%
2700
21st to endDay
3213323347%69%
2700
July1st to 10thDay
221332435%8%67%
2700
11th to 20thDay
2213223346%71%
2532
21st to endDay
421342345%7%64%
2545
August1st to 10thDay
5%31342445%7%62%
2328
11th to 20thDay
3212222447%71%
2299
21st to endDay
431342345%6%65%
2574
September1st to 10thDay
5%313323345%69%
2102
11th to 20thDay
7%323424447%61%
1980
21st to endDay
8%42332235%6%62%
1980
October1st to 10thDay
13%5%24425%45%5%50%
1872
11th to 20thDay
10%6%245%24446%54%
1800
21st to endDay
10%6%25%5%345%5%6%50%
1895
November1st to 10thDay
15%10%45%5%33445%41%
1674
11th to 20thDay
14%10%46%6%25%45%6%38%
1558
21st to endDay
12%14%46%5%33445%41%
1520
December1st to 10thDay
15%15%7%9%6%33335%30%
1520
11th to 20thDay
18%15%6%11%7%3443425%
1831
21st to endDay
12%12%6%7%5%345%5%7%34%
2442
January1st to 10thNight
18%16%5%9%5%34345%28%
2741
11th to 20thNight
18%17%5%7%5%33335%31%
2558
21st to endNight
16%17%7%10%6%2333428%
2574
February1st to 10thNight
16%16%5%9%6%3345%5%29%
2340
11th to 20thNight
15%16%5%7%5%3444433%
2272
21st to endNight
12%16%6%11%7%345%36%27%
1778
March1st to 10thNight
11%15%37%6%345%6%7%33%
2061
11th to 20thNight
11%9%46%5%345%49%41%
1980
21st to endNight
12%13%47%6%36%5%6%7%32%
2178
April1st to 10thNight
12%11%47%43445%8%37%
1908
11th to 20thNight
10%10%36%5%35%46%8%39%
1601
21st to endNight
10%8%25%5%35%45%7%46%
1620
May1st to 10thNight
9%7%36%5%345%6%7%46%
1620
11th to 20thNight
8%5%25%5%46%5%7%10%44%
1586
21st to endNight
13%7%37%6%36%5%6%7%39%
1552
June1st to 10thNight
8%4235%35%6%7%8%47%
1314
11th to 20thNight
11%41443436%7%52%
1260
21st to endNight
32322345%7%68%
1260
July1st to 10thNight
221223347%9%65%
1260
11th to 20thNight
211222345%7%71%
1422
21st to endNight
3213324447%66%
1773
August1st to 10thNight
5%32443445%7%59%
1611
11th to 20thNight
2213233448%67%
1602
21st to endNight
4213312447%67%
1782
September1st to 10thNight
5%31333335%5%67%
1854
11th to 20thNight
6%41342435%7%61%
1980
21st to endNight
9%41332235%6%62%
1980
October1st to 10thNight
11%6%245%24345%55%
2088
11th to 20thNight
12%6%1442334456%
2160
21st to endNight
10%8%35%43445%6%48%
2459
November1st to 10thNight
15%9%3443445%6%43%
2405
11th to 20thNight
15%11%35%5%35%447%39%
2602
21st to endNight
12%12%5%6%5%33446%41%
2660
December1st to 10thNight
15%15%6%10%6%33435%32%
2660
11th to 20thNight
16%17%5%9%6%34445%28%
3347
21st to endNight
14%14%5%9%5%3444435%
5214

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
62%6%16%11%41
1438
11th to 20thDay
57%5%17%15%6%1
1525
21st to endDay
62%6%12%14%5%1
1782
February1st to 10thDay
59%7%12%17%4
1620
11th to 20thDay
57%5%14%17%5%1
1584
21st to endDay
53%8%14%17%7%1
1476
March1st to 10thDay
49%6%17%20%7%2
1898
11th to 20thDay
43%7%16%23%9%1
1980
21st to endDay
54%6%14%20%6%1
2178
April1st to 10thDay
47%7%15%18%12%1
2049
11th to 20thDay
41%5%12%26%13%2
2310
21st to endDay
41%5%11%28%14%1
2340
May1st to 10thDay
37%5%9%28%18%3
2340
11th to 20thDay
37%6%11%30%14%2
2309
21st to endDay
44%6%13%27%9%1
2724
June1st to 10thDay
34%6%14%29%17%1
2641
11th to 20thDay
32%5%10%22%21%10%
2700
21st to endDay
17%36%24%32%19%
2700
July1st to 10thDay
16%4418%36%23%
2626
11th to 20thDay
15%3417%27%35%
2455
21st to endDay
19%35%16%28%29%
2404
August1st to 10thDay
22%37%18%27%22%
2313
11th to 20thDay
14%35%19%36%23%
2299
21st to endDay
19%35%20%32%21%
2574
September1st to 10thDay
19%37%17%32%23%
2102
11th to 20thDay
24%38%25%27%13%
1980
21st to endDay
24%38%29%27%9%
1980
October1st to 10thDay
35%411%28%16%5%
1872
11th to 20thDay
33%416%31%14%2
1800
21st to endDay
35%418%24%17%1
1895
November1st to 10thDay
46%418%22%10%1
1674
11th to 20thDay
46%6%18%21%6%3
1558
21st to endDay
47%5%19%21%8%1
1520
December1st to 10thDay
58%6%12%16%6%2
1520
11th to 20thDay
63%5%11%18%3
1829
21st to endDay
51%6%16%20%8%
2442
January1st to 10thNight
60%6%15%14%41
2741
11th to 20thNight
58%6%14%16%5%1
2558
21st to endNight
62%5%14%14%5%1
2574
February1st to 10thNight
58%5%16%16%41
2340
11th to 20thNight
54%415%20%6%1
2273
21st to endNight
58%6%13%15%7%2
1778
March1st to 10thNight
50%6%15%21%7%1
2061
11th to 20thNight
41%6%16%23%11%2
1980
21st to endNight
51%6%15%21%6%1
2178
April1st to 10thNight
45%6%14%21%12%3
1908
11th to 20thNight
42%6%12%25%13%2
1601
21st to endNight
37%5%12%28%17%
1620
May1st to 10thNight
36%5%9%29%19%1
1620
11th to 20thNight
33%6%13%27%18%3
1587
21st to endNight
43%5%15%24%12%2
1552
June1st to 10thNight
30%8%14%24%21%2
1314
11th to 20thNight
31%5%7%23%24%10%
1260
21st to endNight
15%47%21%30%22%
1260
July1st to 10thNight
15%47%18%29%27%
1225
11th to 20thNight
12%3415%27%39%
1376
21st to endNight
18%45%14%25%34%
1674
August1st to 10thNight
24%47%18%21%26%
1602
11th to 20thNight
17%3419%33%24%
1602
21st to endNight
19%37%17%28%27%
1782
September1st to 10thNight
20%45%14%32%26%
1854
11th to 20thNight
23%48%24%24%18%
1980
21st to endNight
24%37%23%33%10%
1980
October1st to 10thNight
32%411%26%19%7%
2088
11th to 20thNight
32%312%34%16%3
2160
21st to endNight
36%5%15%24%19%1
2459
November1st to 10thNight
42%5%16%25%11%2
2405
11th to 20thNight
46%5%16%25%6%2
2602
21st to endNight
46%419%20%10%1
2660
December1st to 10thNight
57%5%17%14%7%1
2660
11th to 20thNight
60%5%16%17%2
3348
21st to endNight
53%5%13%18%10%1
5214

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
24%9%16%21%25%6%
180
11th to 20thDay
23%5%13%33%18%8%
191
21st to endDay
27%5%16%31%19%2
264
February1st to 10thDay
23%9%28%26%12%3
240
11th to 20thDay
20%6%29%30%14%2
240
21st to endDay
17%13%27%30%11%2
342
March1st to 10thDay
15%15%27%32%10%1
420
11th to 20thDay
11%11%29%30%17%2
420
21st to endDay
17%16%31%27%8%1
462
April1st to 10thDay
20%16%24%26%12%1
420
11th to 20thDay
15%21%30%23%11%1
412
21st to endDay
15%13%25%27%15%5%
420
May1st to 10thDay
13%12%26%26%18%5%
423
11th to 20thDay
10%11%26%28%17%7%
453
21st to endDay
15%7%21%26%22%9%
679
June1st to 10thDay
9%10%21%28%24%8%
630
11th to 20thDay
13%13%24%29%18%3
630
21st to endDay
35%21%38%27%6%
630
July1st to 10thDay
4423%37%26%7%
621
11th to 20thDay
26%24%41%23%2
463
21st to endDay
35%20%34%27%11%
487
August1st to 10thDay
6%422%30%32%6%
447
11th to 20thDay
5%5%16%27%34%13%
437
21st to endDay
6%7%20%30%24%13%
495
September1st to 10thDay
5%5%23%29%28%10%
450
11th to 20thDay
9%7%24%27%25%8%
450
21st to endDay
10%8%19%28%26%9%
450
October1st to 10thDay
11%6%18%28%28%9%
342
11th to 20thDay
12%10%21%22%22%13%
270
21st to endDay
17%12%20%30%18%3
297
November1st to 10thDay
23%9%23%25%11%8%
270
11th to 20thDay
14%9%22%36%16%4
270
21st to endDay
18%7%21%32%20%2
270
December1st to 10thDay
23%6%20%30%15%6%
270
11th to 20thDay
34%317%28%17%1
243
21st to endDay
23%9%14%28%20%7%
198
January1st to 10thNight
23%415%38%18%1
855
11th to 20thNight
25%418%31%18%3
744
21st to endNight
23%217%41%14%2
792
February1st to 10thNight
24%422%37%12%1
720
11th to 20thNight
21%324%38%12%2
704
21st to endNight
17%7%23%39%12%3
592
March1st to 10thNight
17%6%21%43%12%1
720
11th to 20thNight
15%5%24%39%16%1
720
21st to endNight
16%7%25%37%14%1
792
April1st to 10thNight
16%7%23%40%14%1
666
11th to 20thNight
16%7%29%36%11%1
533
21st to endNight
13%5%24%39%18%1
540
May1st to 10thNight
9%8%26%38%18%1
540
11th to 20thNight
9%7%23%35%24%2
531
21st to endNight
14%5%23%37%20%2
584
June1st to 10thNight
10%5%15%41%26%3
414
11th to 20thNight
12%326%40%18%1
360
21st to endNight
3214%53%27%2
360
July1st to 10thNight
2116%48%31%2
350
11th to 20thNight
214%63%20%
356
21st to endNight
3115%48%31%2
591
August1st to 10thNight
5%415%47%29%1
537
11th to 20thNight
2212%50%31%3
534
21st to endNight
5%217%44%28%2
594
September1st to 10thNight
6%216%46%26%4
612
11th to 20thNight
7%216%39%31%5%
720
21st to endNight
11%314%39%27%6%
720
October1st to 10thNight
11%417%43%23%1
720
11th to 20thNight
13%418%39%22%3
720
21st to endNight
14%6%18%43%16%4
792
November1st to 10thNight
18%420%38%18%1
740
11th to 20thNight
18%5%23%39%13%1
892
21st to endNight
17%5%21%37%19%2
950
December1st to 10thNight
21%5%20%40%12%1
950
11th to 20thNight
24%5%17%40%13%1
950
21st to endNight
27%6%19%34%13%1
1045
Page generated at 2024-01-13 17:28:31. Version ac07

Copyright 2024 Attilla Danko


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