Rexburg Nature Park
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Rexburg Nature Park clear sky chart from 2005-11-06 to 2024-10-24.

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%
24694
18%
93855
15%
24518
54%
24518
22%
57223

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
38%
839
11%
4498
7%
831
40%
831
9%
3234
January11th to 20thNight
38%
755
9%
4325
11%
740
40%
740
7%
3355
January21st to endNight
34%
828
6%
4510
9%
814
37%
814
7%
3499
February1st to 10thNight
33%
760
9%
2470
7%
760
37%
760
14%
1850
February11th to 20thNight
37%
742
11%
2403
10%
740
42%
740
17%
1729
February21st to endNight
33%
628
11%
1885
9%
628
36%
628
15%
1413
March1st to 10thNight
44%
755
18%
3525
12%
744
48%
744
13%
2329
March11th to 20thNight
46%
750
20%
3462
13%
740
52%
740
22%
1667
March21st to endNight
42%
820
8%
3764
9%
814
45%
814
13%
2404
April1st to 10thNight
46%
703
17%
2013
10%
703
51%
703
25%
1367
April11th to 20thNight
43%
563
20%
1691
13%
563
48%
563
26%
1094
April21st to endNight
48%
570
21%
1710
15%
570
52%
570
29%
1052
May1st to 10thNight
49%
567
20%
2740
15%
559
51%
559
18%
1619
May11th to 20thNight
55%
551
17%
2707
16%
541
58%
541
25%
1206
May21st to endNight
49%
603
14%
2722
12%
593
52%
593
20%
1447
June1st to 10thNight
61%
434
18%
1384
15%
434
66%
434
31%
794
June11th to 20thNight
52%
380
21%
1330
19%
380
61%
380
33%
727
June21st to endNight
76%
380
28%
1330
31%
380
82%
380
53%
567
July1st to 10thNight
76%
364
33%
1837
33%
360
84%
360
43%
673
July11th to 20thNight
80%
367
28%
1942
40%
365
87%
365
42%
725
July21st to endNight
74%
607
23%
2443
26%
569
78%
569
41%
1080
August1st to 10thNight
67%
557
31%
2338
24%
545
71%
545
35%
1088
August11th to 20thNight
76%
555
30%
2405
28%
543
80%
543
40%
1068
August21st to endNight
69%
616
34%
2636
31%
605
74%
605
43%
1073
September1st to 10thNight
71%
648
34%
1958
28%
648
77%
648
51%
949
September11th to 20thNight
69%
760
30%
2090
24%
760
73%
760
47%
1140
September21st to endNight
68%
760
33%
2090
26%
760
73%
760
49%
1112
October1st to 10thNight
62%
760
26%
2204
20%
760
65%
760
39%
1251
October11th to 20thNight
58%
760
26%
2280
21%
760
63%
760
38%
1284
October21st to endNight
55%
804
23%
2497
19%
804
61%
804
31%
1481
November1st to 10thNight
52%
740
19%
2405
18%
740
54%
740
25%
1524
November11th to 20thNight
45%
891
16%
2601
12%
891
48%
891
23%
1766
November21st to endNight
48%
950
14%
2660
11%
950
51%
950
26%
1806
December1st to 10thNight
39%
950
9%
2660
6%
950
40%
950
17%
2005
December11th to 20thNight
35%
948
10%
3273
6%
948
37%
948
12%
2495
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
8%9%36%44435%6%49%
101308
Night
9%11%37%44435%6%44%
97639
TransparencyDay
36%410%21%18%11%
101054
Night
41%5%11%21%15%8%
97481
SeeingDay
12%9%23%30%20%6%
15301
Night
15%5%20%40%19%2
24862

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
12%23%8%11%445%34422%
2393
11th to 20thDay
14%17%6%11%6%5%4245%26%
2608
21st to endDay
17%23%5%12%43323424%
3146
February1st to 10thDay
15%17%5%11%5%44445%26%
1710
11th to 20thDay
13%16%5%11%6%4436%5%27%
1665
21st to endDay
9%16%6%11%6%4435%6%29%
1565
March1st to 10thDay
8%16%5%11%5%4435%6%33%
3314
11th to 20thDay
7%10%47%43334452%
3490
21st to endDay
9%16%5%12%7%6%5%5%6%6%23%
3825
April1st to 10thDay
11%12%47%5%445%6%7%34%
2163
11th to 20thDay
8%10%37%6%4445%7%42%
2437
21st to endDay
9%10%37%5%4446%8%40%
2470
May1st to 10thDay
11%10%36%5%4445%8%42%
4110
11th to 20thDay
45%25%445%35%9%54%
4089
21st to endDay
8%7%37%44445%7%45%
4825
June1st to 10thDay
8%426%5%45%5%7%9%45%
2791
11th to 20thDay
10%5%25%34435%8%50%
2850
21st to endDay
221333435%7%68%
2850
July1st to 10thDay
1112223346%75%
4740
11th to 20thDay
121323335%7%70%
4433
21st to endDay
221333335%7%67%
4454
August1st to 10thDay
342433446%8%58%
4092
11th to 20thDay
321322335%8%70%
4028
21st to endDay
2313333345%70%
4521
September1st to 10thDay
5%312333245%69%
2218
11th to 20thDay
7%42434435%6%60%
2090
21st to endDay
7%413232247%63%
2090
October1st to 10thDay
11%6%25%44435%5%52%
1976
11th to 20thDay
9%6%25%434346%55%
1900
21st to endDay
10%7%25%44435%7%49%
1924
November1st to 10thDay
15%10%36%444346%40%
1674
11th to 20thDay
13%10%37%5%4435%6%38%
1558
21st to endDay
11%15%47%444345%40%
1520
December1st to 10thDay
14%17%5%11%6%3334430%
1520
11th to 20thDay
17%16%6%12%5%5%434424%
1827
21st to endDay
11%13%5%10%45%5%45%6%34%
2442
January1st to 10thNight
11%17%6%13%444345%27%
4566
11th to 20thNight
18%23%6%10%5%3323423%
4350
21st to endNight
18%24%6%10%43323324%
4521
February1st to 10thNight
16%18%410%5%4335%5%27%
2470
11th to 20thNight
15%17%49%444345%31%
2402
21st to endNight
10%17%5%14%5%45%345%27%
1885
March1st to 10thNight
9%15%5%10%6%45%35%6%32%
3560
11th to 20thNight
7%9%36%43335%6%53%
3490
21st to endNight
9%12%48%5%5%5%5%7%9%31%
3828
April1st to 10thNight
10%13%38%5%4446%7%37%
2013
11th to 20thNight
10%9%27%445%5%6%7%40%
1691
21st to endNight
9%8%26%5%4446%6%46%
1710
May1st to 10thNight
8%11%37%44445%7%43%
2860
11th to 20thNight
4426%45%5%46%7%53%
2812
21st to endNight
9%7%26%5%45%47%8%43%
2762
June1st to 10thNight
8%5%245%45%5%8%8%46%
1384
11th to 20thNight
9%5%25%345%35%7%52%
1330
21st to endNight
222322435%7%67%
1330
July1st to 10thNight
221233235%6%71%
2220
11th to 20thNight
1112335%36%8%68%
2521
21st to endNight
2213245%45%9%64%
3109
August1st to 10thNight
321443446%8%60%
2847
11th to 20thNight
1114344447%65%
2811
21st to endNight
3314222345%71%
3146
September1st to 10thNight
5%313333345%67%
1958
11th to 20thNight
6%41434335%6%60%
2090
21st to endNight
8%413222346%63%
2090
October1st to 10thNight
9%6%25%333345%56%
2204
11th to 20thNight
11%6%24433345%55%
2280
21st to endNight
9%8%36%345%35%7%48%
2497
November1st to 10thNight
15%9%26%43435%6%42%
2405
11th to 20thNight
13%12%36%44445%6%38%
2601
21st to endNight
10%13%47%5%34345%41%
2660
December1st to 10thNight
14%17%5%10%5%44345%31%
2660
11th to 20thNight
15%19%5%10%5%44345%27%
3362
21st to endNight
12%15%5%10%5%4434434%
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
66%5%13%14%31
2393
11th to 20thDay
61%5%14%12%7%1
2608
21st to endDay
65%5%11%12%5%1
3146
February1st to 10thDay
60%7%12%17%4
1710
11th to 20thDay
58%5%14%17%5%1
1674
21st to endDay
53%8%14%17%7%1
1565
March1st to 10thDay
51%5%14%23%6%1
3314
11th to 20thDay
36%413%33%13%1
3490
21st to endDay
61%5%14%16%3
3825
April1st to 10thDay
47%6%15%19%12%1
2163
11th to 20thDay
40%5%12%27%14%2
2440
21st to endDay
41%5%11%29%14%1
2470
May1st to 10thDay
40%5%6%26%18%4
4110
11th to 20thDay
26%5%7%32%21%9%
4092
21st to endDay
37%49%31%17%2
4825
June1st to 10thDay
34%6%14%30%17%1
2791
11th to 20thDay
31%410%22%22%11%
2850
21st to endDay
17%26%24%32%20%
2850
July1st to 10thDay
11%3311%34%39%
4666
11th to 20thDay
15%3210%25%44%
4356
21st to endDay
17%3314%34%29%
4314
August1st to 10thDay
24%3416%30%23%
4078
11th to 20thDay
15%3421%38%20%
4067
21st to endDay
17%3421%29%27%
4520
September1st to 10thDay
18%36%17%33%22%
2218
11th to 20thDay
25%38%25%27%12%
2090
21st to endDay
23%38%29%27%10%
2090
October1st to 10thDay
34%411%27%18%5%
1976
11th to 20thDay
32%315%32%14%3
1900
21st to endDay
36%418%25%16%1
1924
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
1825
21st to endDay
51%6%16%20%8%
2442
January1st to 10thNight
60%5%10%21%4
4566
11th to 20thNight
66%5%11%12%5%1
4350
21st to endNight
67%413%11%41
4521
February1st to 10thNight
59%5%15%16%5%1
2470
11th to 20thNight
55%415%19%6%1
2403
21st to endNight
57%5%14%16%6%1
1885
March1st to 10thNight
51%6%11%24%8%1
3560
11th to 20thNight
32%417%32%13%1
3490
21st to endNight
48%6%19%23%41
3828
April1st to 10thNight
44%6%14%22%11%3
2013
11th to 20thNight
41%6%12%25%14%2
1691
21st to endNight
37%5%12%28%17%
1710
May1st to 10thNight
38%7%8%27%18%2
2860
11th to 20thNight
26%6%9%31%22%7%
2813
21st to endNight
36%5%9%28%20%2
2762
June1st to 10thNight
31%8%14%24%21%2
1384
11th to 20thNight
31%5%7%22%24%11%
1330
21st to endNight
15%47%21%29%24%
1330
July1st to 10thNight
15%3412%23%43%
2185
11th to 20thNight
14%2211%25%45%
2475
21st to endNight
17%4416%28%31%
3011
August1st to 10thNight
21%3413%32%27%
2838
11th to 20thNight
20%3424%29%22%
2838
21st to endNight
17%25%19%28%29%
3146
September1st to 10thNight
19%4414%33%26%
1958
11th to 20thNight
24%48%23%23%17%
2090
21st to endNight
23%36%24%33%11%
2090
October1st to 10thNight
31%311%26%21%8%
2204
11th to 20thNight
32%312%34%16%3
2280
21st to endNight
35%5%15%25%18%1
2497
November1st to 10thNight
42%5%16%25%11%2
2405
11th to 20thNight
46%5%16%25%6%2
2601
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
3363
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%14%33%19%8%
200
21st to endDay
26%5%16%31%18%3
297
February1st to 10thDay
23%11%28%26%11%2
270
11th to 20thDay
20%6%29%30%13%2
270
21st to endDay
18%13%27%30%10%2
377
March1st to 10thDay
15%15%26%32%10%1
460
11th to 20thDay
11%11%29%30%18%2
460
21st to endDay
16%17%30%28%8%1
506
April1st to 10thDay
18%16%25%27%12%1
460
11th to 20thDay
14%21%29%24%11%1
452
21st to endDay
15%13%25%27%15%4
460
May1st to 10thDay
14%13%26%25%17%5%
463
11th to 20thDay
11%12%25%28%18%6%
493
21st to endDay
16%7%21%26%22%8%
734
June1st to 10thDay
9%10%22%28%24%7%
680
11th to 20thDay
13%13%25%29%17%3
680
21st to endDay
46%22%37%25%5%
680
July1st to 10thDay
4424%37%25%7%
671
11th to 20thDay
36%24%40%25%3
503
21st to endDay
35%21%34%27%11%
531
August1st to 10thDay
6%5%22%30%31%7%
487
11th to 20thDay
45%19%28%32%12%
477
21st to endDay
6%8%21%29%24%12%
539
September1st to 10thDay
5%5%22%29%29%11%
490
11th to 20thDay
9%8%23%27%24%8%
490
21st to endDay
9%8%19%28%26%10%
490
October1st to 10thDay
10%5%18%29%28%9%
376
11th to 20thDay
11%10%20%21%22%16%
300
21st to endDay
17%12%20%30%18%3
306
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
241
21st to endDay
23%9%14%28%20%7%
198
January1st to 10thNight
23%415%38%18%1
855
11th to 20thNight
25%5%18%31%18%3
760
21st to endNight
23%317%41%14%2
836
February1st to 10thNight
25%5%21%36%12%1
760
11th to 20thNight
21%424%38%12%2
744
21st to endNight
16%8%24%38%12%3
628
March1st to 10thNight
17%7%21%42%12%1
760
11th to 20thNight
14%5%25%38%16%1
760
21st to endNight
16%7%24%38%14%1
836
April1st to 10thNight
16%7%24%39%14%1
703
11th to 20thNight
16%7%29%37%11%1
563
21st to endNight
12%5%25%39%17%1
570
May1st to 10thNight
9%9%27%37%18%1
570
11th to 20thNight
9%7%23%36%23%1
561
21st to endNight
13%5%22%38%19%2
617
June1st to 10thNight
9%6%16%42%25%3
434
11th to 20thNight
12%327%40%17%1
380
21st to endNight
3216%52%25%2
380
July1st to 10thNight
3116%49%30%2
370
11th to 20thNight
214%63%21%
375
21st to endNight
3115%48%30%2
624
August1st to 10thNight
5%416%47%28%1
567
11th to 20thNight
2214%50%29%2
564
21st to endNight
5%219%44%28%2
627
September1st to 10thNight
5%216%46%27%4
648
11th to 20thNight
7%316%40%30%5%
760
21st to endNight
10%314%40%27%6%
760
October1st to 10thNight
11%416%44%23%1
760
11th to 20thNight
14%418%39%23%3
760
21st to endNight
14%6%19%42%16%4
804
November1st to 10thNight
18%420%38%18%1
740
11th to 20thNight
18%5%23%39%13%1
891
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 2024-10-21 00:20:03. Version ac07

Copyright © 2024 Attilla Danko.


Rexburg Nature Park Clear Sky Chart |Charts Home