Baker City
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Baker City clear sky chart from 2005-11-06 to 2024-03-01.

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%
22800
16%
80772
15%
22718
58%
22718
23%
51871

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%
749
5%
4397
6%
736
42%
736
6%
3455
January11th to 20thNight
42%
754
7%
4404
6%
740
47%
740
7%
3274
January21st to endNight
46%
834
5%
4848
9%
814
50%
814
8%
3868
February1st to 10thNight
38%
760
9%
2548
7%
760
42%
760
15%
1839
February11th to 20thNight
43%
741
12%
2243
10%
740
48%
740
19%
1574
February21st to endNight
39%
628
14%
1884
10%
628
45%
628
17%
1374
March1st to 10thNight
45%
722
13%
2165
11%
722
50%
722
20%
1514
March11th to 20thNight
48%
720
12%
2124
10%
720
51%
720
23%
1452
March21st to endNight
41%
792
11%
1980
5%
792
44%
792
21%
1455
April1st to 10thNight
48%
720
13%
1800
6%
720
50%
720
26%
1289
April11th to 20thNight
43%
711
20%
1779
9%
711
48%
711
29%
1208
April21st to endNight
48%
550
17%
1630
12%
550
52%
550
29%
1017
May1st to 10thNight
49%
491
21%
1571
17%
491
54%
491
34%
867
May11th to 20thNight
60%
354
16%
1416
19%
354
64%
354
23%
830
May21st to endNight
56%
388
12%
1552
16%
388
60%
388
22%
931
June1st to 10thNight
56%
360
11%
1440
15%
360
61%
360
23%
838
June11th to 20thNight
53%
360
16%
1440
18%
360
63%
360
29%
760
June21st to endNight
72%
360
22%
1440
36%
360
78%
360
47%
605
July1st to 10thNight
72%
350
22%
1400
32%
350
81%
350
51%
545
July11th to 20thNight
72%
348
29%
1392
39%
348
83%
348
66%
458
July21st to endNight
75%
394
35%
1488
41%
372
85%
372
62%
510
August1st to 10thNight
74%
358
32%
1424
37%
356
81%
356
49%
577
August11th to 20thNight
75%
566
34%
1634
26%
566
78%
566
66%
718
August21st to endNight
73%
792
35%
1980
20%
792
76%
792
65%
980
September1st to 10thNight
72%
720
37%
1800
20%
720
76%
720
65%
901
September11th to 20thNight
74%
720
34%
1895
23%
720
77%
720
52%
1022
September21st to endNight
67%
720
32%
1980
27%
720
71%
720
48%
1066
October1st to 10thNight
62%
720
23%
2042
18%
720
68%
720
38%
1194
October11th to 20thNight
61%
720
25%
2209
22%
720
67%
720
34%
1269
October21st to endNight
55%
792
20%
2574
19%
792
60%
792
27%
1569
November1st to 10thNight
52%
740
18%
2405
18%
740
55%
740
20%
1636
November11th to 20thNight
47%
760
14%
2470
12%
760
51%
760
19%
1693
November21st to endNight
51%
760
14%
2652
12%
760
56%
760
24%
1673
December1st to 10thNight
45%
760
11%
2660
8%
760
49%
760
15%
1918
December11th to 20thNight
40%
759
7%
3269
6%
759
44%
759
10%
2501
December21st to endNight
34%
827
7%
4837
6%
817
40%
817
7%
3491

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
5%7%37%6%45%5%6%7%44%
78403
Night
6%8%37%6%45%5%6%7%43%
81026
TransparencyDay
37%10%13%19%14%6%
78107
Night
38%11%15%20%13%4
80843
SeeingDay
9%14%30%28%15%4
13468
Night
8%7%24%38%20%3
22833

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
6%15%7%12%10%5%7%7%7%7%17%
2539
11th to 20thDay
8%12%9%11%9%5%6%5%6%7%22%
2540
21st to endDay
10%13%6%10%10%5%9%7%7%6%18%
2794
February1st to 10thDay
6%11%5%9%7%5%6%7%7%10%28%
1629
11th to 20thDay
411%5%11%8%5%5%6%7%8%30%
1826
21st to endDay
28%5%9%10%5%7%9%7%8%29%
1570
March1st to 10thDay
49%5%10%9%5%8%7%7%8%27%
1801
11th to 20thDay
49%48%9%46%8%7%10%30%
1834
21st to endDay
7%10%5%10%9%5%8%7%7%8%26%
2376
April1st to 10thDay
6%10%5%9%8%46%6%7%8%32%
2160
11th to 20thDay
6%9%49%7%46%6%6%7%36%
2129
21st to endDay
6%8%37%7%45%5%6%7%42%
2330
May1st to 10thDay
5%5%26%6%35%5%6%8%48%
2386
11th to 20thDay
9%5%36%5%45%6%6%9%42%
2477
21st to endDay
9%7%37%8%46%5%6%8%37%
2723
June1st to 10thDay
9%6%37%6%46%6%7%8%38%
2520
11th to 20thDay
8%5%35%5%45%46%8%48%
2520
21st to endDay
33235%345%5%6%63%
2520
July1st to 10thDay
121242446%6%68%
2520
11th to 20thDay
1112222346%77%
2520
21st to endDay
1112223345%76%
2741
August1st to 10thDay
321233445%7%65%
2507
11th to 20thDay
2212323345%74%
2262
21st to endDay
221332335%6%70%
2376
September1st to 10thDay
2212323346%73%
2160
11th to 20thDay
5%3135%2446%7%61%
2064
21st to endDay
4425%43436%6%59%
1980
October1st to 10thDay
7%5%36%5%35%446%52%
1915
11th to 20thDay
5%5%26%5%35%46%8%51%
1751
21st to endDay
7%7%36%6%35%6%5%7%43%
1782
November1st to 10thDay
10%8%37%6%46%6%6%8%37%
1674
11th to 20thDay
5%9%5%8%7%5%8%6%7%10%32%
1710
21st to endDay
5%7%48%6%5%6%7%6%10%35%
1525
December1st to 10thDay
6%11%411%9%5%5%7%6%8%28%
1520
11th to 20thDay
7%13%5%11%10%6%7%7%7%9%18%
1928
21st to endDay
6%10%5%9%10%48%7%9%9%22%
2794
January1st to 10thNight
6%11%6%12%10%6%8%7%7%8%20%
4406
11th to 20thNight
12%15%6%9%8%45%5%47%25%
4420
21st to endNight
9%12%5%11%9%5%7%7%6%7%23%
4862
February1st to 10thNight
6%12%5%8%7%5%6%5%6%8%32%
2548
11th to 20thNight
6%9%49%7%46%5%7%8%35%
2242
21st to endNight
49%48%9%5%7%7%7%8%31%
1884
March1st to 10thNight
6%9%47%7%46%6%7%9%35%
2165
11th to 20thNight
6%7%37%7%47%6%9%9%36%
2124
21st to endNight
5%9%5%9%7%46%7%6%9%33%
1980
April1st to 10thNight
6%9%38%7%5%6%5%6%7%38%
1800
11th to 20thNight
7%8%46%6%45%45%6%46%
1779
21st to endNight
8%7%25%44447%9%46%
1630
May1st to 10thNight
5%6%244235%6%9%54%
1571
11th to 20thNight
8%5%145%45%7%7%8%46%
1416
21st to endNight
6%437%7%45%6%6%8%44%
1552
June1st to 10thNight
6%5%25%6%45%6%6%10%45%
1440
11th to 20thNight
8%5%145%35%45%7%54%
1440
21st to endNight
33122235%5%8%66%
1440
July1st to 10thNight
2111324447%72%
1440
11th to 20thNight
111212335%81%
1440
21st to endNight
1112213445%76%
1576
August1st to 10thNight
321332346%7%66%
1432
11th to 20thNight
112312346%77%
1634
21st to endNight
121222335%6%72%
1980
September1st to 10thNight
2313213345%74%
1800
11th to 20thNight
32144245%5%6%63%
1895
21st to endNight
5%324423447%63%
1980
October1st to 10thNight
7%425%5%25%45%6%55%
2042
11th to 20thNight
5%5%25%6%3445%7%54%
2209
21st to endNight
6%6%25%7%35%6%5%7%47%
2574
November1st to 10thNight
8%10%37%6%45%6%7%8%37%
2405
11th to 20thNight
7%9%37%7%47%6%6%8%37%
2470
21st to endNight
48%47%5%45%5%7%7%43%
2652
December1st to 10thNight
6%10%49%7%47%6%7%7%33%
2660
11th to 20thNight
7%12%49%9%47%7%7%8%24%
3276
21st to endNight
7%12%49%7%46%6%8%10%27%
4862

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
56%19%16%9%1
2539
11th to 20thDay
56%14%17%11%2
2540
21st to endDay
61%17%12%7%21
2794
February1st to 10thDay
48%14%18%15%4
1629
11th to 20thDay
48%13%16%17%6%
1836
21st to endDay
48%12%17%16%6%1
1570
March1st to 10thDay
51%13%15%13%6%1
1801
11th to 20thDay
46%13%14%19%7%
1834
21st to endDay
54%13%15%14%4
2376
April1st to 10thDay
47%12%16%16%6%2
2160
11th to 20thDay
44%10%14%18%12%2
2132
21st to endDay
40%9%14%22%14%1
2330
May1st to 10thDay
32%9%15%30%14%1
2386
11th to 20thDay
37%9%17%26%9%2
2480
21st to endDay
43%12%14%22%8%
2724
June1st to 10thDay
41%9%15%25%9%
2520
11th to 20thDay
33%8%13%25%16%5%
2520
21st to endDay
21%6%11%25%28%9%
2520
July1st to 10thDay
15%5%10%21%29%20%
2451
11th to 20thDay
10%48%15%32%32%
2445
21st to endDay
11%26%12%36%33%
2589
August1st to 10thDay
18%49%22%29%18%
2490
11th to 20thDay
14%47%21%33%21%
2262
21st to endDay
15%5%8%24%32%16%
2376
September1st to 10thDay
14%48%23%30%20%
2160
11th to 20thDay
21%7%11%22%26%13%
2064
21st to endDay
26%7%10%28%22%7%
1980
October1st to 10thDay
33%8%9%24%22%4
1915
11th to 20thDay
30%7%13%29%17%3
1751
21st to endDay
38%10%16%24%12%1
1782
November1st to 10thDay
44%10%17%20%8%1
1674
11th to 20thDay
44%14%18%19%41
1710
21st to endDay
41%12%21%18%7%1
1525
December1st to 10thDay
52%13%16%14%5%
1520
11th to 20thDay
57%17%14%9%2
1928
21st to endDay
50%19%16%11%4
2794
January1st to 10thNight
52%20%17%8%2
4406
11th to 20thNight
55%13%16%13%3
4420
21st to endNight
57%16%14%10%2
4862
February1st to 10thNight
48%12%18%17%4
2548
11th to 20thNight
45%11%18%17%9%
2243
21st to endNight
47%13%14%18%7%2
1884
March1st to 10thNight
43%11%16%20%7%2
2165
11th to 20thNight
41%11%19%23%6%1
2124
21st to endNight
45%11%19%20%5%
1980
April1st to 10thNight
43%9%17%23%7%1
1800
11th to 20thNight
39%8%14%25%13%2
1779
21st to endNight
34%9%17%23%16%1
1630
May1st to 10thNight
26%8%16%34%15%1
1571
11th to 20thNight
34%11%16%30%9%1
1416
21st to endNight
37%9%18%26%10%
1552
June1st to 10thNight
34%10%18%28%10%
1440
11th to 20thNight
29%8%15%29%16%3
1440
21st to endNight
16%6%13%33%25%7%
1440
July1st to 10thNight
13%6%8%25%28%20%
1400
11th to 20thNight
8%39%20%31%29%
1392
21st to endNight
10%36%16%35%30%
1488
August1st to 10thNight
16%5%10%23%30%16%
1424
11th to 20thNight
11%48%22%34%22%
1634
21st to endNight
13%49%24%34%17%
1980
September1st to 10thNight
13%48%26%30%20%
1800
11th to 20thNight
19%6%10%23%26%15%
1895
21st to endNight
22%6%9%28%25%10%
1980
October1st to 10thNight
28%7%12%25%23%4
2042
11th to 20thNight
29%8%13%27%21%3
2209
21st to endNight
34%9%17%21%18%1
2574
November1st to 10thNight
43%11%13%21%11%1
2405
11th to 20thNight
44%11%18%21%6%
2470
21st to endNight
37%10%20%20%12%1
2652
December1st to 10thNight
45%15%17%15%7%1
2660
11th to 20thNight
53%15%18%11%3
3276
21st to endNight
48%18%15%12%7%
4862

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
15%11%32%24%14%4
180
11th to 20thDay
11%17%29%26%14%4
180
21st to endDay
7%13%33%32%12%3
198
February1st to 10thDay
12%19%35%26%8%1
289
11th to 20thDay
8%22%36%24%9%1
443
21st to endDay
7%22%37%26%8%1
382
March1st to 10thDay
11%22%37%26%4
421
11th to 20thDay
10%18%34%27%10%1
420
21st to endDay
15%21%29%23%11%1
462
April1st to 10thDay
15%23%28%21%10%3
420
11th to 20thDay
13%25%32%17%9%4
412
21st to endDay
13%20%33%22%10%2
420
May1st to 10thDay
10%21%29%26%10%4
423
11th to 20thDay
17%16%28%20%15%4
448
21st to endDay
12%11%26%28%18%5%
485
June1st to 10thDay
10%13%30%23%18%6%
450
11th to 20thDay
10%18%32%28%9%3
450
21st to endDay
410%29%32%19%6%
450
July1st to 10thDay
37%31%38%18%3
446
11th to 20thDay
18%34%32%21%3
444
21st to endDay
16%29%36%23%5%
487
August1st to 10thDay
5%428%33%22%7%
447
11th to 20thDay
35%21%33%28%10%
437
21st to endDay
5%8%26%30%22%8%
495
September1st to 10thDay
38%22%35%23%8%
450
11th to 20thDay
6%8%24%32%23%7%
450
21st to endDay
6%10%29%33%18%4
450
October1st to 10thDay
10%13%26%26%20%5%
450
11th to 20thDay
8%12%30%27%18%5%
401
21st to endDay
10%18%25%27%16%4
297
November1st to 10thDay
14%13%29%29%14%
270
11th to 20thDay
8%11%31%34%13%3
270
21st to endDay
10%13%29%34%12%2
183
December1st to 10thDay
13%14%27%25%14%6%
180
11th to 20thDay
13%18%37%24%7%1
180
21st to endDay
5%15%37%28%11%4
198
January1st to 10thNight
10%9%29%32%16%3
760
11th to 20thNight
10%11%25%33%17%4
760
21st to endNight
10%7%24%36%19%3
836
February1st to 10thNight
12%9%29%36%12%2
760
11th to 20thNight
9%9%28%33%19%2
744
21st to endNight
9%9%34%31%15%2
628
March1st to 10thNight
8%9%29%37%16%1
722
11th to 20thNight
10%9%26%36%18%2
720
21st to endNight
9%10%28%39%13%1
792
April1st to 10thNight
9%10%26%36%17%3
720
11th to 20thNight
10%10%31%31%17%3
711
21st to endNight
10%9%28%37%15%1
550
May1st to 10thNight
7%10%30%35%16%2
491
11th to 20thNight
11%6%18%34%28%3
354
21st to endNight
7%423%37%26%3
389
June1st to 10thNight
7%6%23%41%22%2
360
11th to 20thNight
9%7%27%37%18%2
360
21st to endNight
3219%51%24%1
360
July1st to 10thNight
1418%51%23%3
350
11th to 20thNight
1222%56%18%1
348
21st to endNight
1219%52%25%2
394
August1st to 10thNight
3216%47%29%3
358
11th to 20thNight
2217%43%32%5%
566
21st to endNight
2318%43%30%4
792
September1st to 10thNight
3319%40%31%5%
720
11th to 20thNight
4215%37%35%7%
720
21st to endNight
6%417%38%29%6%
720
October1st to 10thNight
8%321%37%27%4
720
11th to 20thNight
7%7%19%39%22%8%
720
21st to endNight
9%7%20%38%22%4
792
November1st to 10thNight
10%9%21%39%20%1
740
11th to 20thNight
9%10%26%36%16%3
760
21st to endNight
8%5%28%35%19%5%
760
December1st to 10thNight
10%8%27%33%20%3
760
11th to 20thNight
11%9%27%37%13%2
760
21st to endNight
13%13%29%34%10%1
836
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