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 2026-09-14.

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 Type	Minimum conditions for hour to be usable				Out of hours
	Clear of Clouds	Transparency	Seeing	Sky Brightness
Planetary:	50%	(no limit)	Average	(no limit)	Nighttime Hours
Deep Sky:	70%	Average	(no limit)	5.9	Nighttime Hours
CCD Imaging:	70%	Below Average	Poor	(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

By Month

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 Forecast	Data Points
Cloud Cover	Day	4 6% 2 6% 4 4 5% 4 6% 7% 52%	158041
	Night	5% 7% 2 7% 5% 4 4 4 6% 7% 50%	150392
Transparency	Day	29% 8% 12% 23% 19% 10%	152782
	Night	32% 8% 13% 24% 17% 6%	146654
Seeing	Day	9% 14% 30% 28% 15% 4	16790
	Night	8% 7% 25% 38% 19% 3	25894

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
Month	Days in Month		Occurrence of each Forecast	Data Points
January	1st to 10th	Day	6% 14% 6% 13% 8% 8% 7% 6% 7% 9% 18%	4722
	11th to 20th	Day	4 7% 5% 7% 5% 4 4 4 6% 9% 44%	4740
	21st to end	Day	6% 9% 3 8% 6% 6% 6% 4 6% 6% 39%	5187
February	1st to 10th	Day	6% 12% 4 10% 6% 6% 6% 5% 7% 9% 28%	1801
	11th to 20th	Day	4 11% 5% 12% 7% 7% 5% 4 7% 8% 30%	2024
	21st to end	Day	2 9% 5% 10% 9% 7% 7% 6% 7% 8% 31%	1730
March	1st to 10th	Day	2 9% 4 10% 7% 5% 7% 6% 8% 9% 33%	4618
	11th to 20th	Day	2 6% 3 8% 6% 6% 6% 5% 7% 8% 42%	4748
	21st to end	Day	4 10% 4 10% 8% 7% 8% 6% 8% 8% 27%	6101
April	1st to 10th	Day	6% 10% 4 10% 6% 5% 5% 5% 7% 8% 34%	2520
	11th to 20th	Day	5% 9% 4 9% 6% 6% 5% 5% 6% 8% 38%	2489
	21st to end	Day	6% 8% 3 8% 6% 5% 5% 4 6% 8% 43%	2719
May	1st to 10th	Day	4 4 2 5% 4 4 4 4 6% 6% 57%	7788
	11th to 20th	Day	6% 5% 2 5% 4 4 4 4 5% 8% 54%	8160
	21st to end	Day	4 4 1 5% 4 4 4 4 6% 8% 55%	8992
June	1st to 10th	Day	8% 7% 2 7% 5% 5% 5% 5% 6% 8% 41%	2940
	11th to 20th	Day	7% 5% 2 5% 4 4 4 3 6% 7% 50%	2940
	21st to end	Day	3 3 1 4 4 4 4 4 6% 7% 62%	2940
July	1st to 10th	Day	2 2 1 2 2 2 3 3 4 5% 75%	8219
	11th to 20th	Day	2 2 1 3 2 3 2 2 3 4 76%	8220
	21st to end	Day	2 1 1 2 2 3 3 3 5% 6% 73%	8922
August	1st to 10th	Day	3 3 1 3 3 3 4 3 4 7% 67%	8110
	11th to 20th	Day	1 2 1 3 2 3 3 3 5% 6% 71%	7436
	21st to end	Day	3 2 1 4 3 3 4 3 6% 8% 62%	7750
September	1st to 10th	Day	2 2 1 3 3 3 3 3 5% 7% 70%	2520
	11th to 20th	Day	4 3 1 5% 4 4 4 3 6% 7% 59%	2329
	21st to end	Day	4 4 2 6% 3 4 4 2 5% 6% 61%	2200
October	1st to 10th	Day	4 3 2 5% 3 3 3 2 3 5% 67%	3479
	11th to 20th	Day	5% 5% 2 7% 4 4 4 4 5% 8% 51%	3168
	21st to end	Day	7% 8% 3 7% 5% 5% 6% 4 6% 8% 42%	3200
November	1st to 10th	Day	9% 8% 3 7% 6% 6% 5% 4 6% 8% 36%	1854
	11th to 20th	Day	5% 10% 4 9% 6% 6% 8% 5% 7% 9% 31%	1890
	21st to end	Day	5% 8% 3 9% 5% 7% 6% 6% 7% 10% 35%	1685
December	1st to 10th	Day	4 9% 3 9% 6% 4 4 4 5% 8% 46%	2700
	11th to 20th	Day	6% 13% 5% 12% 8% 7% 7% 5% 7% 10% 20%	3108
	21st to end	Day	8% 12% 4 11% 8% 7% 7% 5% 8% 10% 22%	4092
January	1st to 10th	Night	7% 13% 5% 12% 7% 7% 7% 5% 8% 9% 20%	8172
	11th to 20th	Night	6% 9% 3 7% 4 4 4 3 5% 8% 48%	8220
	21st to end	Night	5% 8% 3 9% 6% 5% 5% 4 6% 7% 40%	8994
February	1st to 10th	Night	6% 13% 3 9% 7% 6% 5% 5% 6% 8% 32%	2816
	11th to 20th	Night	5% 10% 4 11% 6% 6% 5% 4 7% 8% 35%	2484
	21st to end	Night	3 10% 3 9% 8% 7% 6% 5% 7% 7% 32%	2076
March	1st to 10th	Night	2 8% 4 9% 5% 5% 5% 5% 7% 9% 40%	5496
	11th to 20th	Night	4 9% 4 9% 6% 5% 5% 4 6% 6% 43%	5457
	21st to end	Night	4 10% 4 10% 6% 6% 6% 6% 7% 9% 32%	5116
April	1st to 10th	Night	5% 9% 2 9% 6% 6% 6% 4 7% 7% 39%	2100
	11th to 20th	Night	7% 9% 3 6% 5% 5% 4 4 5% 6% 47%	2079
	21st to end	Night	7% 7% 2 5% 4 5% 4 3 7% 9% 47%	1900
May	1st to 10th	Night	5% 5% 1 3 3 3 3 3 5% 8% 62%	5148
	11th to 20th	Night	4 5% 2 4 3 3 4 3 5% 8% 59%	4700
	21st to end	Night	4 4 2 5% 4 4 4 4 5% 7% 57%	5181
June	1st to 10th	Night	6% 5% 2 6% 5% 4 5% 5% 6% 9% 48%	1680
	11th to 20th	Night	7% 5% 2 5% 4 4 4 3 5% 7% 55%	1680
	21st to end	Night	4 3 1 3 2 2 3 4 5% 7% 65%	1680
July	1st to 10th	Night	1 1 1 2 2 2 3 3 4 5% 76%	4740
	11th to 20th	Night	1 1 2 2 2 2 2 4 5% 80%	4740
	21st to end	Night	2 2 1 2 2 2 3 3 5% 7% 73%	5153
August	1st to 10th	Night	2 1 1 3 2 2 3 3 5% 5% 72%	4682
	11th to 20th	Night	1 1 1 2 3 2 3 2 4 6% 75%	5408
	21st to end	Night	2 3 1 4 3 3 4 3 5% 6% 65%	6499
September	1st to 10th	Night	2 3 1 3 2 2 4 2 4 6% 71%	2100
	11th to 20th	Night	4 3 1 5% 3 4 4 4 5% 6% 61%	2137
	21st to end	Night	4 3 1 5% 3 3 3 3 4 6% 64%	2200
October	1st to 10th	Night	4 3 1 4 3 3 3 2 4 4 69%	3718
	11th to 20th	Night	5% 4 2 5% 4 3 4 3 6% 7% 56%	3987
	21st to end	Night	6% 7% 2 6% 5% 5% 5% 5% 5% 7% 47%	4600
November	1st to 10th	Night	7% 11% 3 8% 5% 5% 5% 5% 7% 8% 37%	2665
	11th to 20th	Night	7% 10% 3 8% 6% 6% 6% 4 6% 8% 35%	2730
	21st to end	Night	4 9% 3 8% 5% 5% 5% 4 7% 8% 42%	2932
December	1st to 10th	Night	4 7% 2 7% 4 4 4 4 5% 8% 51%	4700
	11th to 20th	Night	9% 13% 4 11% 8% 6% 7% 5% 7% 8% 21%	5316
	21st to end	Night	7% 14% 4 11% 7% 6% 5% 5% 7% 9% 25%	7106

Transparency (when cloud cover <= 30%)
Color Meanings: Too cloudy to forecast Poor Below Average Average Above average Transparent
Month	Days in Month		Occurrence of each Forecast	Data Points
January	1st to 10th	Day	55% 14% 16% 13% 2	4723
	11th to 20th	Day	33% 9% 20% 26% 11% 1	4740
	21st to end	Day	42% 11% 12% 23% 11% 1	5187
February	1st to 10th	Day	48% 13% 18% 15% 5%	1801
	11th to 20th	Day	47% 13% 16% 17% 7%	2034
	21st to end	Day	47% 11% 16% 17% 8% 1	1730
March	1st to 10th	Day	40% 12% 19% 17% 11% 1	4618
	11th to 20th	Day	34% 10% 13% 31% 12%	4748
	21st to end	Day	45% 15% 18% 16% 5%	6101
April	1st to 10th	Day	45% 11% 17% 20% 6% 1	2520
	11th to 20th	Day	41% 9% 14% 20% 13% 2	2492
	21st to end	Day	38% 9% 14% 23% 15% 2	2719
May	1st to 10th	Day	24% 6% 11% 30% 28% 2	7788
	11th to 20th	Day	27% 5% 13% 33% 18% 4	8163
	21st to end	Day	23% 9% 14% 33% 18% 2	8994
June	1st to 10th	Day	38% 9% 14% 26% 13% 1	2940
	11th to 20th	Day	31% 7% 12% 26% 19% 5%	2940
	21st to end	Day	21% 5% 11% 25% 29% 9%	2940
July	1st to 10th	Day	13% 3 4 19% 34% 28%	8151
	11th to 20th	Day	14% 2 3 9% 29% 42%	8145
	21st to end	Day	13% 2 4 21% 33% 27%	8723
August	1st to 10th	Day	15% 3 4 11% 28% 40%	6424
	11th to 20th	Day	15% 3 8% 25% 35% 15%	5859
	21st to end	Day	17% 3 6% 30% 28% 16%	6077
September	1st to 10th	Day	15% 4 8% 24% 30% 19%	2520
	11th to 20th	Day	23% 7% 12% 22% 24% 12%	2329
	21st to end	Day	24% 6% 10% 29% 23% 8%	2200
October	1st to 10th	Day	22% 5% 9% 24% 31% 9%	3479
	11th to 20th	Day	31% 5% 14% 30% 18% 3	3168
	21st to end	Day	38% 7% 12% 31% 11% 1	3200
November	1st to 10th	Day	44% 10% 18% 20% 7% 1	1854
	11th to 20th	Day	45% 14% 18% 19% 3 1	1890
	21st to end	Day	40% 12% 22% 19% 7% 1	1685
December	1st to 10th	Day	37% 8% 18% 34% 3	2700
	11th to 20th	Day	56% 14% 19% 9% 2	3108
	21st to end	Day	52% 15% 16% 13% 4	4092
January	1st to 10th	Night	52% 15% 18% 12% 3	8172
	11th to 20th	Night	34% 8% 18% 28% 11% 1	8220
	21st to end	Night	42% 11% 12% 21% 14% 1	8994
February	1st to 10th	Night	48% 12% 18% 18% 5%	2816
	11th to 20th	Night	45% 10% 18% 18% 9%	2485
	21st to end	Night	46% 12% 14% 19% 8% 2	2076
March	1st to 10th	Night	36% 10% 13% 25% 14% 2	5496
	11th to 20th	Night	38% 7% 11% 32% 12%	5457
	21st to end	Night	41% 15% 18% 20% 6%	5116
April	1st to 10th	Night	40% 9% 17% 26% 7% 1	2100
	11th to 20th	Night	37% 8% 14% 27% 13% 2	2079
	21st to end	Night	32% 9% 16% 25% 17% 1	1900
May	1st to 10th	Night	19% 5% 9% 36% 28% 2	5146
	11th to 20th	Night	24% 5% 11% 36% 22% 1	4700
	21st to end	Night	26% 7% 16% 38% 13% 1	5182
June	1st to 10th	Night	32% 9% 16% 29% 13% 1	1680
	11th to 20th	Night	28% 7% 13% 27% 20% 4	1680
	21st to end	Night	18% 5% 12% 31% 26% 7%	1680
July	1st to 10th	Night	12% 3 3 23% 30% 30%	4700
	11th to 20th	Night	9% 2 4 12% 33% 40%	4692
	21st to end	Night	12% 2 4 25% 35% 23%	5040
August	1st to 10th	Night	13% 3 4 11% 37% 32%	3701
	11th to 20th	Night	11% 3 7% 27% 38% 13%	4259
	21st to end	Night	16% 3 6% 32% 28% 15%	5092
September	1st to 10th	Night	15% 4 8% 25% 30% 18%	2100
	11th to 20th	Night	22% 6% 10% 24% 25% 13%	2137
	21st to end	Night	21% 5% 9% 28% 26% 11%	2200
October	1st to 10th	Night	20% 5% 8% 23% 32% 13%	3718
	11th to 20th	Night	26% 6% 18% 25% 23% 2	3987
	21st to end	Night	35% 7% 13% 31% 14% 1	4600
November	1st to 10th	Night	42% 10% 15% 21% 11% 1	2665
	11th to 20th	Night	45% 11% 18% 20% 6%	2730
	21st to end	Night	38% 10% 21% 20% 11% 1	2932
December	1st to 10th	Night	30% 10% 20% 32% 8%	4700
	11th to 20th	Night	57% 11% 18% 10% 3	5316
	21st to end	Night	51% 15% 15% 12% 7%	7106

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
Month	Days in Month		Occurrence of each Forecast	Data Points
January	1st to 10th	Day	14% 13% 32% 26% 12% 3	220
	11th to 20th	Day	9% 15% 28% 29% 16% 4	220
	21st to end	Day	6% 11% 33% 33% 15% 2	242
February	1st to 10th	Day	12% 18% 33% 26% 10% 1	341
	11th to 20th	Day	8% 21% 35% 25% 10% 1	521
	21st to end	Day	7% 20% 37% 27% 8%	446
March	1st to 10th	Day	11% 21% 35% 28% 6%	540
	11th to 20th	Day	11% 19% 32% 25% 11% 1	540
	21st to end	Day	13% 22% 32% 21% 11% 1	594
April	1st to 10th	Day	13% 21% 27% 23% 12% 4	540
	11th to 20th	Day	14% 22% 32% 19% 10% 4	532
	21st to end	Day	12% 17% 35% 23% 11% 3	540
May	1st to 10th	Day	10% 20% 30% 24% 11% 5%	543
	11th to 20th	Day	16% 17% 30% 20% 13% 4	568
	21st to end	Day	11% 12% 25% 28% 18% 5%	617
June	1st to 10th	Day	10% 15% 30% 24% 16% 6%	570
	11th to 20th	Day	9% 17% 33% 28% 9% 3	570
	21st to end	Day	4 10% 29% 32% 19% 6%	570
July	1st to 10th	Day	4 8% 31% 36% 18% 4	566
	11th to 20th	Day	3 8% 35% 32% 20% 3	564
	21st to end	Day	1 6% 30% 36% 21% 6%	619
August	1st to 10th	Day	4 7% 29% 32% 21% 7%	567
	11th to 20th	Day	3 6% 24% 33% 26% 8%	557
	21st to end	Day	5% 8% 26% 30% 22% 9%	627
September	1st to 10th	Day	4 8% 21% 35% 22% 10%	570
	11th to 20th	Day	6% 8% 24% 32% 22% 7%	543
	21st to end	Day	7% 10% 27% 33% 18% 5%	530
October	1st to 10th	Day	9% 12% 26% 26% 21% 5%	530
	11th to 20th	Day	8% 12% 30% 27% 18% 5%	475
	21st to end	Day	10% 16% 26% 28% 16% 3	363
November	1st to 10th	Day	15% 11% 30% 28% 15% 1	330
	11th to 20th	Day	11% 13% 31% 31% 12% 2	330
	21st to end	Day	10% 11% 31% 34% 12% 2	223
December	1st to 10th	Day	14% 12% 27% 24% 16% 7%	220
	11th to 20th	Day	14% 18% 35% 24% 8% 1	220
	21st to end	Day	6% 17% 35% 28% 11% 3	242
January	1st to 10th	Night	10% 9% 30% 32% 16% 3	840
	11th to 20th	Night	9% 10% 26% 35% 17% 3	840
	21st to end	Night	9% 7% 24% 38% 19% 3	924
February	1st to 10th	Night	12% 9% 29% 37% 12% 2	840
	11th to 20th	Night	9% 8% 29% 34% 17% 2	824
	21st to end	Night	9% 8% 36% 31% 15% 2	692
March	1st to 10th	Night	7% 9% 30% 38% 15% 1	840
	11th to 20th	Night	9% 10% 28% 34% 18% 2	840
	21st to end	Night	9% 10% 29% 39% 12% 1	924
April	1st to 10th	Night	8% 9% 26% 37% 17% 2	840
	11th to 20th	Night	10% 10% 30% 33% 15% 3	831
	21st to end	Night	10% 9% 29% 38% 14% 1	640
May	1st to 10th	Night	7% 11% 28% 36% 15% 2	572
	11th to 20th	Night	10% 7% 23% 33% 26% 2	414
	21st to end	Night	7% 4 24% 37% 25% 2	455
June	1st to 10th	Night	7% 6% 23% 41% 22% 1	420
	11th to 20th	Night	8% 9% 27% 39% 16% 1	420
	21st to end	Night	5% 2 20% 50% 22% 1	420
July	1st to 10th	Night	1 4 18% 54% 20% 2	410
	11th to 20th	Night	1 2 22% 57% 17% 1	408
	21st to end	Night	1 2 19% 53% 24% 1	460
August	1st to 10th	Night	3 2 16% 50% 27% 2	418
	11th to 20th	Night	2 2 18% 45% 29% 4	662
	21st to end	Night	3 3 18% 44% 28% 3	924
September	1st to 10th	Night	3 3 18% 41% 31% 4	840
	11th to 20th	Night	5% 2 16% 38% 33% 6%	812
	21st to end	Night	6% 4 17% 38% 30% 5%	800
October	1st to 10th	Night	8% 3 21% 38% 27% 4	800
	11th to 20th	Night	7% 6% 21% 39% 21% 7%	800
	21st to end	Night	8% 7% 22% 38% 20% 4	880
November	1st to 10th	Night	10% 8% 23% 40% 19% 1	820
	11th to 20th	Night	10% 10% 27% 36% 15% 3	840
	21st to end	Night	9% 5% 28% 36% 19% 4	840
December	1st to 10th	Night	9% 8% 27% 33% 20% 3	840
	11th to 20th	Night	12% 9% 28% 37% 12% 2	840
	21st to end	Night	13% 12% 31% 33% 10% 1	924

Page generated at 2026-09-11 01:11:51. Version ac07

Copyright © 2026 Attilla Danko.