Pocatello
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Pocatello clear sky chart from 2005-11-06 to 2024-01-14.

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
49%
23799
19%
74624
16%
23753
54%
23753
27%
46516

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
35%
756
9%
2646
8%
756
39%
756
14%
1953
January11th to 20thNight
37%
736
13%
2521
11%
736
41%
736
15%
1822
January21st to endNight
37%
792
11%
2574
10%
792
40%
792
14%
1930
February1st to 10thNight
30%
720
10%
2340
7%
720
35%
720
14%
1704
February11th to 20thNight
36%
702
13%
2219
11%
700
41%
700
20%
1524
February21st to endNight
36%
592
15%
1776
11%
592
42%
592
18%
1295
March1st to 10thNight
38%
720
15%
2080
10%
720
44%
720
20%
1466
March11th to 20thNight
45%
720
20%
1980
13%
720
51%
720
29%
1286
March21st to endNight
38%
792
12%
2178
7%
792
42%
792
21%
1576
April1st to 10thNight
42%
704
17%
1920
9%
704
47%
704
25%
1288
April11th to 20thNight
37%
533
21%
1601
13%
533
43%
533
23%
1040
April21st to endNight
47%
540
23%
1620
15%
540
51%
540
30%
971
May1st to 10thNight
53%
540
20%
1620
16%
540
55%
540
32%
955
May11th to 20thNight
56%
531
19%
1595
16%
531
59%
531
29%
980
May21st to endNight
53%
583
14%
1670
13%
582
55%
582
27%
1090
June1st to 10thNight
61%
430
19%
1330
17%
430
68%
430
34%
749
June11th to 20thNight
56%
360
23%
1260
23%
360
65%
360
36%
652
June21st to endNight
74%
360
31%
1260
37%
360
80%
360
54%
525
July1st to 10thNight
79%
350
25%
1347
33%
350
84%
350
47%
568
July11th to 20thNight
73%
363
31%
1407
37%
363
80%
363
55%
532
July21st to endNight
81%
591
29%
1674
27%
558
83%
558
56%
792
August1st to 10thNight
73%
537
28%
1602
24%
534
76%
534
46%
835
August11th to 20thNight
76%
534
35%
1602
27%
534
78%
534
53%
777
August21st to endNight
73%
594
38%
1782
31%
594
77%
594
54%
849
September1st to 10thNight
69%
670
33%
1894
24%
670
75%
670
57%
911
September11th to 20thNight
67%
720
32%
1980
25%
720
71%
720
48%
1059
September21st to endNight
64%
720
34%
1980
25%
720
69%
720
48%
1048
October1st to 10thNight
59%
720
25%
2055
18%
720
64%
720
40%
1169
October11th to 20thNight
57%
720
28%
2160
23%
720
62%
720
38%
1199
October21st to endNight
54%
792
26%
2473
20%
792
62%
792
33%
1401
November1st to 10thNight
47%
740
21%
2405
17%
740
52%
740
24%
1505
November11th to 20thNight
41%
783
19%
2493
13%
783
48%
783
23%
1609
November21st to endNight
45%
950
15%
2660
11%
950
49%
950
25%
1788
December1st to 10thNight
35%
950
12%
2660
6%
950
39%
950
19%
1946
December11th to 20thNight
30%
949
11%
3203
6%
949
33%
949
13%
2409
December21st to endNight
22%
1005
6%
5057
4%
998
27%
998
8%
3313

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%8%36%5%3445%7%47%
74720
Night
9%9%46%5%3445%7%45%
75042
TransparencyDay
36%6%12%20%17%9%
74433
Night
39%6%12%20%16%8%
74849
SeeingDay
13%13%27%28%16%4
14008
Night
14%7%22%36%18%3
23819

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
13%18%6%7%6%36%346%28%
1519
11th to 20thDay
12%13%6%9%7%345%5%6%31%
1514
21st to endDay
11%19%7%10%6%3445%5%26%
1782
February1st to 10thDay
11%16%7%9%7%3445%6%28%
1620
11th to 20thDay
11%17%5%9%6%2445%5%31%
1625
21st to endDay
9%17%7%9%7%45%46%5%28%
1480
March1st to 10thDay
10%14%5%8%7%45%45%6%32%
1879
11th to 20thDay
9%11%5%6%6%45%5%7%7%36%
1980
21st to endDay
12%16%5%9%7%345%5%6%28%
2178
April1st to 10thDay
12%11%5%7%6%35%6%5%6%34%
2034
11th to 20thDay
10%11%5%7%6%3445%7%39%
2307
21st to endDay
9%10%47%5%3446%8%40%
2340
May1st to 10thDay
8%7%245%36%5%6%8%44%
2340
11th to 20thDay
8%6%25%6%45%6%6%10%41%
2301
21st to endDay
12%8%36%6%45%6%7%8%36%
2602
June1st to 10thDay
8%6%244345%6%8%50%
2626
11th to 20thDay
8%5%24435%5%5%7%54%
2700
21st to endDay
3212323347%70%
2700
July1st to 10thDay
221232346%8%67%
2568
11th to 20thDay
221332445%7%68%
2502
21st to endDay
331343446%6%63%
2545
August1st to 10thDay
442343446%8%58%
2328
11th to 20thDay
3212323346%71%
2299
21st to endDay
431342345%6%65%
2574
September1st to 10thDay
4213323346%68%
2062
11th to 20thDay
432332345%7%64%
1980
21st to endDay
7%323423436%63%
1980
October1st to 10thDay
11%6%244345%5%6%49%
1904
11th to 20thDay
7%7%36%5%345%47%51%
1800
21st to endDay
8%7%25%5%4445%7%49%
1882
November1st to 10thDay
13%12%46%5%3445%6%40%
1674
11th to 20thDay
12%11%45%42446%7%40%
1665
21st to endDay
9%11%38%6%35%45%5%41%
1520
December1st to 10thDay
13%14%6%9%6%43436%31%
1520
11th to 20thDay
12%14%5%11%8%45%6%6%6%24%
1880
21st to endDay
9%13%5%8%5%35%5%6%8%34%
2510
January1st to 10thNight
13%15%5%9%5%4445%7%28%
2646
11th to 20thNight
12%15%5%9%6%3445%7%31%
2521
21st to endNight
13%14%6%8%7%35%436%30%
2574
February1st to 10thNight
12%13%6%10%6%35%46%7%29%
2340
11th to 20thNight
10%13%5%8%6%34346%38%
2218
21st to endNight
8%14%6%10%7%45%5%5%7%30%
1776
March1st to 10thNight
8%12%48%6%46%6%6%7%33%
2080
11th to 20thNight
6%9%45%5%36%5%6%8%42%
1980
21st to endNight
10%12%5%7%6%35%6%6%8%33%
2178
April1st to 10thNight
10%11%46%6%35%45%6%42%
1920
11th to 20thNight
8%10%48%5%3446%6%42%
1601
21st to endNight
8%8%35%425%5%5%5%49%
1620
May1st to 10thNight
7%8%25%5%345%5%7%49%
1620
11th to 20thNight
8%5%25%6%36%6%5%8%44%
1594
21st to endNight
13%6%25%5%36%5%5%6%42%
1670
June1st to 10thNight
7%4245%35%5%7%9%49%
1330
11th to 20thNight
8%4244245%5%6%57%
1260
21st to endNight
222332335%6%69%
1260
July1st to 10thNight
22133245%6%9%62%
1387
11th to 20thNight
121332346%6%70%
1455
21st to endNight
231343445%8%64%
1773
August1st to 10thNight
32144345%7%7%58%
1611
11th to 20thNight
231342335%7%65%
1602
21st to endNight
3313423347%67%
1782
September1st to 10thNight
3322322345%70%
1894
11th to 20thNight
5%31342445%6%62%
1980
21st to endNight
8%323223345%64%
1980
October1st to 10thNight
9%5%24433446%56%
2055
11th to 20thNight
10%6%25%424345%57%
2160
21st to endNight
7%7%244245%6%8%51%
2473
November1st to 10thNight
12%10%35%43445%7%42%
2405
11th to 20thNight
11%10%46%5%345%5%7%40%
2493
21st to endNight
7%12%5%7%6%35%45%6%40%
2660
December1st to 10thNight
12%14%5%8%6%3445%6%34%
2660
11th to 20thNight
12%14%6%9%8%3445%6%28%
3311
21st to endNight
11%12%5%10%7%44446%32%
5173

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
57%8%18%13%41
1519
11th to 20thDay
53%8%13%18%6%2
1514
21st to endDay
60%8%13%14%41
1782
February1st to 10thDay
55%8%13%18%41
1620
11th to 20thDay
53%7%17%17%5%1
1634
21st to endDay
55%6%16%15%6%1
1480
March1st to 10thDay
50%8%13%21%7%2
1879
11th to 20thDay
45%7%15%23%9%1
1980
21st to endDay
54%6%18%15%7%1
2178
April1st to 10thDay
48%6%14%17%12%3
2034
11th to 20thDay
44%5%11%23%16%2
2310
21st to endDay
41%5%13%25%16%1
2340
May1st to 10thDay
35%6%13%25%20%2
2340
11th to 20thDay
36%8%12%27%16%2
2304
21st to endDay
42%8%13%24%11%1
2602
June1st to 10thDay
30%7%14%29%18%2
2626
11th to 20thDay
28%412%23%22%11%
2700
21st to endDay
14%37%21%37%18%
2700
July1st to 10thDay
14%37%17%33%25%
2499
11th to 20thDay
15%37%13%29%34%
2427
21st to endDay
19%46%13%25%32%
2404
August1st to 10thDay
23%5%7%16%26%23%
2313
11th to 20thDay
15%36%17%36%24%
2299
21st to endDay
18%46%18%33%21%
2574
September1st to 10thDay
18%38%15%31%26%
2062
11th to 20thDay
19%411%23%27%16%
1980
21st to endDay
23%48%24%32%9%
1980
October1st to 10thDay
35%6%11%23%19%6%
1904
11th to 20thDay
33%5%14%30%15%4
1800
21st to endDay
34%6%16%26%18%1
1882
November1st to 10thDay
45%6%14%21%12%1
1674
11th to 20thDay
41%7%19%23%8%2
1665
21st to endDay
45%5%18%20%10%2
1520
December1st to 10thDay
54%9%14%16%43
1520
11th to 20thDay
58%9%13%17%2
1878
21st to endDay
49%7%17%19%8%
2510
January1st to 10thNight
55%8%16%15%5%1
2646
11th to 20thNight
52%8%15%18%5%2
2521
21st to endNight
56%8%14%14%6%2
2574
February1st to 10thNight
53%8%16%17%5%
2340
11th to 20thNight
48%6%15%20%9%1
2219
21st to endNight
53%6%14%18%7%2
1776
March1st to 10thNight
48%8%14%23%7%1
2080
11th to 20thNight
38%7%14%26%13%2
1980
21st to endNight
48%8%15%20%8%1
2178
April1st to 10thNight
43%5%13%20%15%4
1920
11th to 20thNight
43%6%13%21%16%2
1601
21st to endNight
35%5%13%24%22%
1620
May1st to 10thNight
34%5%11%26%21%2
1620
11th to 20thNight
35%8%11%21%22%4
1595
21st to endNight
39%8%14%26%12%2
1670
June1st to 10thNight
30%6%15%23%23%4
1330
11th to 20thNight
27%5%11%20%25%12%
1260
21st to endNight
16%26%15%33%27%
1260
July1st to 10thNight
18%46%13%29%29%
1347
11th to 20thNight
14%35%10%26%43%
1407
21st to endNight
18%35%14%25%36%
1674
August1st to 10thNight
22%5%7%16%22%27%
1602
11th to 20thNight
20%25%12%30%30%
1602
21st to endNight
17%46%14%32%27%
1782
September1st to 10thNight
17%37%12%27%34%
1894
11th to 20thNight
23%46%19%28%20%
1980
21st to endNight
23%36%23%32%12%
1980
October1st to 10thNight
29%5%11%23%23%9%
2055
11th to 20thNight
29%411%30%21%5%
2160
21st to endNight
29%7%14%28%20%2
2473
November1st to 10thNight
41%6%13%22%16%2
2405
11th to 20thNight
42%7%16%23%11%1
2493
21st to endNight
44%6%16%23%10%2
2660
December1st to 10thNight
51%8%16%16%7%2
2660
11th to 20thNight
56%7%15%18%4
3312
21st to endNight
52%6%16%16%9%
5173

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
26%17%17%23%16%1
180
11th to 20thDay
18%11%34%21%13%4
188
21st to endDay
21%13%31%24%11%1
264
February1st to 10thDay
23%20%30%22%6%
240
11th to 20thDay
19%20%28%23%8%2
290
21st to endDay
19%22%32%19%7%1
346
March1st to 10thDay
20%20%33%21%5%
420
11th to 20thDay
13%20%30%26%10%
420
21st to endDay
21%22%33%20%5%
462
April1st to 10thDay
24%20%25%22%8%1
420
11th to 20thDay
20%25%30%14%10%
412
21st to endDay
17%19%28%23%10%3
420
May1st to 10thDay
9%19%33%24%13%2
423
11th to 20thDay
14%15%26%25%16%4
448
21st to endDay
16%8%24%27%19%7%
557
June1st to 10thDay
8%10%24%28%24%6%
630
11th to 20thDay
13%13%27%30%15%3
630
21st to endDay
36%25%34%26%6%
630
July1st to 10thDay
26%22%38%26%5%
494
11th to 20thDay
26%34%40%16%2
444
21st to endDay
3421%38%28%6%
487
August1st to 10thDay
8%5%28%34%21%4
447
11th to 20thDay
36%26%36%23%6%
437
21st to endDay
47%22%34%27%6%
495
September1st to 10thDay
48%24%30%26%8%
450
11th to 20thDay
7%11%26%27%23%7%
450
21st to endDay
9%11%20%34%20%6%
450
October1st to 10thDay
13%12%24%25%19%7%
374
11th to 20thDay
13%17%17%22%24%7%
270
21st to endDay
15%16%24%32%11%2
297
November1st to 10thDay
20%17%25%24%10%4
270
11th to 20thDay
17%10%31%26%13%3
270
21st to endDay
16%11%28%30%14%1
270
December1st to 10thDay
23%8%26%31%9%3
270
11th to 20thDay
25%9%31%25%9%
255
21st to endDay
26%12%30%19%12%2
198
January1st to 10thNight
20%8%24%32%14%1
760
11th to 20thNight
22%9%23%30%14%3
736
21st to endNight
22%6%21%33%16%2
792
February1st to 10thNight
21%11%27%31%10%1
720
11th to 20thNight
18%8%29%34%9%2
704
21st to endNight
14%13%28%32%12%2
592
March1st to 10thNight
14%9%31%35%10%1
720
11th to 20thNight
10%9%28%37%14%2
720
21st to endNight
19%9%26%36%10%1
792
April1st to 10thNight
16%12%25%32%14%2
704
11th to 20thNight
16%10%31%33%10%1
533
21st to endNight
12%9%25%35%17%2
540
May1st to 10thNight
10%10%20%40%18%2
540
11th to 20thNight
10%7%20%35%24%4
531
21st to endNight
15%8%17%35%22%5%
584
June1st to 10thNight
9%6%17%37%27%3
430
11th to 20thNight
10%6%24%40%18%1
360
21st to endNight
3215%44%30%6%
360
July1st to 10thNight
3111%48%34%4
350
11th to 20thNight
2220%48%28%1
363
21st to endNight
3210%46%36%4
591
August1st to 10thNight
3115%48%29%2
537
11th to 20thNight
4112%45%34%3
534
21st to endNight
3316%46%27%4
594
September1st to 10thNight
5%318%42%27%5%
670
11th to 20thNight
7%318%40%26%7%
720
21st to endNight
11%417%36%24%7%
720
October1st to 10thNight
12%420%38%23%3
720
11th to 20thNight
12%7%19%36%24%3
720
21st to endNight
10%9%22%40%16%3
792
November1st to 10thNight
17%10%21%35%14%3
740
11th to 20thNight
16%9%26%35%13%1
783
21st to endNight
15%9%23%35%15%3
950
December1st to 10thNight
19%10%26%35%9%1
950
11th to 20thNight
23%9%27%29%11%1
950
21st to endNight
27%11%28%26%8%1
1017
Page generated at 2024-01-11 11:32:04. Version ac07

Copyright 2024 Attilla Danko


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