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 2005-11-05 to

2017-09-12
.

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
53%
15479
18%
46699
15%
15440
55%
15440
27%
29845

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
38%
775
8%
2565
8%
775
39%
775
13%
1970
January16th to endNight
40%
768
10%
2527
10%
768
42%
768
14%
1877
February1st to 15thNight
39%
699
8%
2288
8%
697
40%
697
15%
1692
February16th to endNight
37%
632
11%
1954
10%
632
41%
632
17%
1415
March1st to 15thNight
47%
720
12%
2034
10%
720
50%
720
22%
1438
March16th to endNight
43%
768
13%
2112
9%
768
46%
768
22%
1494
April1st to 15thNight
47%
623
15%
1811
10%
623
51%
623
26%
1200
April16th to endNight
47%
540
21%
1620
16%
540
50%
540
27%
1026
May1st to 15thNight
52%
539
18%
1619
15%
539
55%
539
32%
969
May16th to endNight
54%
562
16%
1549
14%
561
57%
561
31%
997
June1st to 15thNight
59%
394
16%
1294
15%
394
64%
394
32%
742
June16th to endNight
73%
360
28%
1260
29%
360
80%
360
53%
538
July1st to 15thNight
83%
340
24%
1231
30%
340
88%
340
54%
508
July16th to endNight
80%
510
29%
1539
31%
477
83%
477
58%
670
August1st to 15thNight
77%
539
28%
1611
26%
536
78%
536
51%
789
August16th to endNight
75%
573
38%
1719
31%
573
78%
573
56%
809
September1st to 15thNight
73%
635
29%
1859
24%
635
78%
635
51%
933
September16th to endNight
70%
656
33%
1815
27%
656
74%
656
48%
975
October1st to 15thNight
61%
660
25%
1936
20%
660
64%
660
37%
1116
October16th to endNight
59%
704
23%
2164
20%
704
63%
704
32%
1307
November1st to 15thNight
50%
722
19%
2297
18%
722
52%
722
26%
1455
November16th to endNight
46%
900
13%
2520
10%
900
48%
900
23%
1743
December1st to 15thNight
37%
900
6%
2520
4%
900
39%
900
15%
1963
December16th to endNight
36%
960
8%
2855
6%
960
38%
960
13%
2219

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
9%7%35%424446%47%
47967
Night
11%9%35%424446%43%
46876
TransparencyDay
37%412%21%16%8%
47643
Night
41%5%13%20%13%6%
46700
SeeingDay
12%9%23%28%20%6%
5785
Night
15%418%38%21%2
15491

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 15thDay
18%14%6%8%5%2343427%
1382
16th to endDay
18%15%5%8%5%2433429%
1695
February1st to 15thDay
17%13%46%5%2445%5%30%
1575
16th to endDay
9%13%6%8%6%3445%6%30%
1518
March1st to 15thDay
9%12%47%5%35%448%34%
1926
16th to endDay
12%11%5%8%6%3445%5%32%
2112
April1st to 15thDay
10%11%46%5%345%6%7%35%
2137
16th to endDay
9%7%45%6%3445%6%41%
2340
May1st to 15thDay
8%6%24434448%48%
2331
16th to endDay
11%8%36%5%35%45%8%38%
2563
June1st to 15thDay
10%425%5%345%6%8%43%
2663
16th to endDay
322323346%67%
2700
July1st to 15thDay
221232335%8%66%
2654
16th to endDay
3212223346%67%
2521
August1st to 15thDay
321231235%8%65%
2340
16th to endDay
3212223346%66%
2483
September1st to 15thDay
5%312223345%65%
2018
16th to endDay
7%212322346%62%
1815
October1st to 15thDay
13%4235%24445%48%
1694
16th to endDay
11%5%245%245%5%5%46%
1707
November1st to 15thDay
14%9%45%424335%42%
1548
16th to endDay
13%12%36%5%24436%37%
1440
December1st to 15thDay
16%15%6%9%7%2434425%
1440
16th to endDay
20%13%6%8%5%3343426%
1365
January1st to 15thNight
19%15%48%5%23236%27%
2565
16th to endNight
18%15%6%7%42333331%
2527
February1st to 15thNight
17%15%47%5%23345%29%
2277
16th to endNight
12%14%5%8%5%35%446%29%
1954
March1st to 15thNight
10%12%36%5%35%46%7%34%
2034
16th to endNight
12%10%5%7%5%2445%7%34%
2112
April1st to 15thNight
11%7%36%4345%6%8%36%
1811
16th to endNight
11%7%25%434447%44%
1620
May1st to 15thNight
6%6%26%43445%7%47%
1619
16th to endNight
9%6%25%5%35%5%6%7%42%
1548
June1st to 15thNight
9%313425%5%6%8%46%
1294
16th to endNight
3112213346%68%
1260
July1st to 15thNight
1112245%6%9%63%
1304
16th to endNight
212223437%68%
1646
August1st to 15thNight
2233235%5%8%62%
1620
16th to endNight
313213438%66%
1719
September1st to 15thNight
5%213323345%64%
1859
16th to endNight
7%313223336%62%
1815
October1st to 15thNight
11%5%23423345%52%
1936
16th to endNight
12%6%24334346%48%
2164
November1st to 15thNight
15%9%2432335%5%43%
2297
16th to endNight
12%11%45%5%24345%38%
2520
December1st to 15thNight
17%14%48%6%33445%27%
2520
16th to endNight
19%17%5%7%5%2333426%
2855

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
58%7%17%10%5%
1382
16th to endDay
58%6%14%14%41
1695
February1st to 15thDay
55%7%16%16%4
1575
16th to endDay
51%7%16%17%4
1518
March1st to 15thDay
47%7%18%20%41
1926
16th to endDay
53%5%13%20%6%
2112
April1st to 15thDay
44%6%16%21%10%
2137
16th to endDay
41%412%28%12%1
2340
May1st to 15thDay
35%48%31%17%2
2331
16th to endDay
42%5%13%25%10%1
2566
June1st to 15thDay
36%5%12%25%16%3
2663
16th to endDay
17%26%21%33%18%
2700
July1st to 15thDay
17%35%19%31%23%
2498
16th to endDay
17%2415%25%34%
2365
August1st to 15thDay
17%35%16%29%25%
2325
16th to endDay
18%35%20%30%21%
2483
September1st to 15thDay
20%28%19%33%15%
2018
16th to endDay
22%310%28%25%9%
1815
October1st to 15thDay
36%415%31%9%3
1694
16th to endDay
37%417%24%14%
1707
November1st to 15thDay
44%418%21%8%2
1548
16th to endDay
48%421%18%5%1
1440
December1st to 15thDay
61%6%12%15%2
1440
16th to endDay
61%5%15%12%3
1365
January1st to 15thNight
59%6%15%12%4
2565
16th to endNight
57%5%15%16%31
2527
February1st to 15thNight
56%5%17%15%4
2288
16th to endNight
54%5%16%18%41
1954
March1st to 15thNight
47%6%17%20%6%1
2034
16th to endNight
48%6%14%23%6%1
2112
April1st to 15thNight
42%5%17%23%10%
1811
16th to endNight
39%5%10%28%15%
1620
May1st to 15thNight
35%49%29%18%2
1620
16th to endNight
38%5%14%24%14%2
1549
June1st to 15thNight
31%6%13%24%20%3
1294
16th to endNight
15%36%18%34%21%
1260
July1st to 15thNight
15%36%20%26%27%
1231
16th to endNight
15%25%13%25%37%
1539
August1st to 15thNight
18%46%18%23%28%
1611
16th to endNight
17%26%18%30%25%
1719
September1st to 15thNight
20%47%17%31%19%
1859
16th to endNight
23%38%25%29%9%
1815
October1st to 15thNight
32%315%31%13%3
1936
16th to endNight
36%413%27%17%1
2164
November1st to 15thNight
41%5%15%26%8%2
2297
16th to endNight
47%419%19%8%1
2520
December1st to 15thNight
59%6%18%12%3
2520
16th to endNight
61%415%13%31
2855

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%115%21%28%11%
60
16th to endDay
30%112%30%21%3
91
February1st to 15thDay
27%325%13%23%6%
90
16th to endDay
18%11%33%25%8%2
177
March1st to 15thDay
15%19%31%25%7%
270
16th to endDay
21%19%32%19%6%
288
April1st to 15thDay
16%17%26%24%13%2
269
16th to endDay
18%14%27%25%11%1
270
May1st to 15thDay
11%11%30%25%15%5%
288
16th to endDay
16%6%20%25%22%8%
464
June1st to 15thDay
10%11%22%29%21%5%
495
16th to endDay
48%24%28%27%6%
495
July1st to 15thDay
45%17%34%29%8%
432
16th to endDay
3425%40%19%6%
327
August1st to 15thDay
4328%32%26%4
315
16th to endDay
6%418%32%23%14%
332
September1st to 15thDay
6%7%22%28%23%12%
300
16th to endDay
8%7%24%25%22%10%
255
October1st to 15thDay
16%5%17%25%29%5%
134
16th to endDay
25%9%11%21%22%9%
96
November1st to 15thDay
18%28%27%18%23%
90
16th to endDay
25%6%23%35%7%1
90
December1st to 15thDay
31%326%28%10%
90
16th to endDay
28%113%29%17%8%
67
January1st to 15thNight
25%5%13%36%17%1
780
16th to endNight
24%414%34%19%2
768
February1st to 15thNight
23%318%37%15%1
704
16th to endNight
15%7%23%38%11%3
632
March1st to 15thNight
15%6%22%39%14%1
720
16th to endNight
17%7%24%36%12%1
768
April1st to 15thNight
15%6%23%36%16%1
623
16th to endNight
15%5%27%35%15%
540
May1st to 15thNight
7%6%25%37%21%1
540
16th to endNight
12%419%37%22%2
563
June1st to 15thNight
10%419%40%23%1
394
16th to endNight
4217%44%27%4
360
July1st to 15thNight
210%47%37%2
340
16th to endNight
211%45%36%3
510
August1st to 15thNight
4110%46%35%2
539
16th to endNight
4113%43%33%3
573
September1st to 15thNight
6%114%37%32%6%
635
16th to endNight
8%214%32%33%8%
656
October1st to 15thNight
14%315%38%25%3
660
16th to endNight
14%315%39%22%5%
704
November1st to 15thNight
19%419%34%20%1
722
16th to endNight
17%6%19%36%17%2
900
December1st to 15thNight
23%6%18%38%12%1
900
16th to endNight
28%5%15%35%13%1
960
Page generated at 2017-09-13 05:39:19. Version ac04

Copyright 2017 A. Danko


Rexburg Nature Park Clear Sky Chart | Charts Home