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 2024-11-01.

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 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	5% 6% 3 7% 5% 5% 5% 4 6% 7% 48%	101405
	Night	5% 8% 3 7% 5% 5% 5% 4 6% 7% 46%	97684
Transparency	Day	32% 9% 12% 20% 16% 10%	101149
	Night	34% 10% 14% 21% 15% 7%	97529
Seeing	Day	9% 14% 30% 28% 16% 4	14433
	Night	8% 7% 24% 38% 20% 3	23598

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% 16% 7% 14% 8% 8% 6% 6% 7% 7% 17%	2539
	11th to 20th	Day	8% 13% 8% 12% 8% 6% 6% 4 6% 7% 22%	2540
	21st to end	Day	10% 13% 5% 12% 8% 8% 8% 5% 7% 6% 18%	2794
February	1st to 10th	Day	6% 12% 4 10% 6% 6% 6% 5% 7% 9% 28%	1629
	11th to 20th	Day	4 12% 4 12% 7% 7% 5% 5% 7% 8% 30%	1826
	21st to end	Day	2 9% 5% 10% 9% 7% 7% 7% 7% 8% 29%	1570
March	1st to 10th	Day	2 11% 4 9% 7% 6% 8% 6% 8% 8% 30%	3138
	11th to 20th	Day	2 7% 3 6% 5% 4 5% 4 5% 7% 51%	3240
	21st to end	Day	5% 11% 4 11% 8% 7% 8% 6% 8% 8% 24%	4165
April	1st to 10th	Day	6% 11% 4 10% 6% 6% 6% 5% 7% 7% 32%	2280
	11th to 20th	Day	5% 9% 4 10% 6% 6% 5% 5% 6% 8% 37%	2249
	21st to end	Day	6% 8% 3 8% 6% 6% 5% 4 6% 8% 42%	2460
May	1st to 10th	Day	6% 7% 3 8% 6% 5% 5% 4 6% 6% 44%	4195
	11th to 20th	Day	5% 3 2 4 3 3 3 3 5% 7% 62%	4377
	21st to end	Day	6% 6% 2 7% 6% 5% 5% 4 7% 9% 42%	4813
June	1st to 10th	Day	8% 7% 3 7% 5% 5% 6% 5% 7% 8% 39%	2660
	11th to 20th	Day	8% 5% 2 5% 5% 5% 4 4 6% 8% 49%	2660
	21st to end	Day	3 3 1 3 4 4 3 3 5% 7% 63%	2660
July	1st to 10th	Day	1 1 1 2 2 2 2 3 4 4 79%	4420
	11th to 20th	Day	1 1 1 2 1 2 2 2 4 5% 79%	4420
	21st to end	Day	1 1 1 2 2 2 2 3 4 6% 77%	4790
August	1st to 10th	Day	4 3 2 3 3 3 4 3 5% 7% 63%	4400
	11th to 20th	Day	2 2 1 3 2 3 3 3 4 5% 71%	3951
	21st to end	Day	2 2 1 3 2 3 2 3 5% 5% 72%	4180
September	1st to 10th	Day	2 2 1 3 3 3 3 3 4 6% 72%	2280
	11th to 20th	Day	5% 3 1 4 4 4 4 3 6% 7% 59%	2178
	21st to end	Day	4 4 2 6% 3 4 4 2 6% 6% 60%	2090
October	1st to 10th	Day	7% 5% 3 6% 4 4 4 3 4 6% 53%	2021
	11th to 20th	Day	5% 5% 2 7% 4 5% 4 4 6% 8% 50%	1848
	21st to end	Day	7% 8% 3 7% 6% 5% 5% 5% 5% 7% 42%	1881
November	1st to 10th	Day	9% 8% 3 7% 5% 6% 5% 4 6% 8% 36%	1674
	11th to 20th	Day	4 10% 4 9% 6% 7% 7% 5% 7% 9% 32%	1710
	21st to end	Day	5% 8% 3 9% 6% 7% 6% 6% 7% 9% 35%	1525
December	1st to 10th	Day	5% 12% 4 12% 8% 6% 6% 5% 6% 8% 28%	1520
	11th to 20th	Day	6% 14% 5% 13% 9% 7% 7% 5% 7% 9% 18%	1928
	21st to end	Day	6% 11% 5% 10% 8% 6% 7% 5% 9% 9% 22%	2794
January	1st to 10th	Night	6% 12% 5% 14% 8% 8% 7% 5% 7% 8% 20%	4406
	11th to 20th	Night	12% 16% 5% 10% 7% 6% 5% 4 4 7% 25%	4420
	21st to end	Night	9% 12% 5% 12% 7% 6% 7% 6% 6% 7% 23%	4862
February	1st to 10th	Night	6% 13% 3 9% 7% 6% 5% 5% 6% 7% 32%	2548
	11th to 20th	Night	5% 10% 3 11% 6% 6% 5% 4 7% 8% 35%	2242
	21st to end	Night	3 11% 4 9% 8% 7% 6% 6% 7% 7% 31%	1884
March	1st to 10th	Night	3 9% 4 8% 6% 6% 6% 5% 7% 9% 37%	3736
	11th to 20th	Night	4 7% 3 7% 4 4 4 3 6% 6% 51%	3725
	21st to end	Night	5% 9% 4 11% 7% 6% 7% 7% 7% 9% 28%	3488
April	1st to 10th	Night	6% 10% 2 9% 6% 6% 6% 4 6% 7% 38%	1900
	11th to 20th	Night	7% 9% 3 6% 5% 5% 4 4 5% 6% 46%	1879
	21st to end	Night	7% 7% 2 5% 4 5% 5% 3 8% 9% 45%	1720
May	1st to 10th	Night	9% 8% 2 6% 5% 4 3 3 6% 7% 48%	2769
	11th to 20th	Night	4 3 1 3 3 3 3 3 5% 6% 67%	2516
	21st to end	Night	6% 6% 3 7% 6% 4 4 4 5% 7% 49%	2762
June	1st to 10th	Night	6% 5% 2 6% 5% 4 5% 5% 6% 10% 46%	1520
	11th to 20th	Night	8% 5% 2 5% 4 4 4 3 5% 7% 54%	1520
	21st to end	Night	3 3 1 3 2 2 3 4 5% 8% 66%	1520
July	1st to 10th	Night	1 1 1 1 1 1 2 2 2 4 83%	2540
	11th to 20th	Night	1 1 1 2 2 4 5% 83%	2540
	21st to end	Night	1 2 1 2 2 2 3 3 5% 5% 74%	2761
August	1st to 10th	Night	3 2 1 4 3 3 4 4 6% 6% 65%	2529
	11th to 20th	Night	1 1 2 2 2 3 2 4 6% 77%	2872
	21st to end	Night	1 2 1 3 2 2 3 2 4 5% 74%	3498
September	1st to 10th	Night	2 3 1 3 2 2 3 2 4 5% 74%	1900
	11th to 20th	Night	4 3 1 4 3 3 4 4 5% 6% 61%	2001
	21st to end	Night	5% 3 1 5% 3 3 3 3 4 7% 64%	2090
October	1st to 10th	Night	6% 4 2 6% 4 3 4 3 5% 6% 57%	2156
	11th to 20th	Night	5% 5% 2 6% 5% 4 4 3 5% 7% 54%	2332
	21st to end	Night	6% 6% 2 6% 5% 5% 5% 5% 5% 7% 47%	2717
November	1st to 10th	Night	7% 11% 3 8% 5% 5% 5% 5% 7% 8% 37%	2411
	11th to 20th	Night	7% 9% 3 8% 6% 6% 7% 4 6% 8% 36%	2470
	21st to end	Night	4 9% 4 8% 5% 5% 5% 4 8% 7% 43%	2652
December	1st to 10th	Night	6% 11% 4 10% 7% 6% 6% 5% 7% 7% 32%	2660
	11th to 20th	Night	7% 12% 4 11% 8% 6% 7% 5% 8% 8% 24%	3276
	21st to end	Night	6% 13% 4 10% 6% 5% 6% 5% 8% 10% 27%	4862

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	56% 19% 16% 9% 1	2539
	11th to 20th	Day	56% 14% 17% 11% 2	2540
	21st to end	Day	61% 17% 12% 7% 2 1	2794
February	1st to 10th	Day	48% 14% 18% 15% 4	1629
	11th to 20th	Day	48% 13% 16% 17% 6%	1836
	21st to end	Day	48% 12% 17% 16% 6% 1	1570
March	1st to 10th	Day	41% 15% 17% 18% 9% 1	3138
	11th to 20th	Day	28% 11% 12% 36% 12%	3240
	21st to end	Day	46% 19% 17% 13% 4	4165
April	1st to 10th	Day	47% 12% 17% 17% 6% 2	2280
	11th to 20th	Day	42% 10% 15% 19% 13% 2	2252
	21st to end	Day	39% 10% 14% 22% 14% 1	2460
May	1st to 10th	Day	33% 10% 14% 27% 15% 1	4195
	11th to 20th	Day	21% 6% 12% 34% 21% 6%	4380
	21st to end	Day	31% 14% 19% 26% 9%	4814
June	1st to 10th	Day	40% 9% 15% 25% 10%	2660
	11th to 20th	Day	32% 8% 12% 25% 17% 5%	2660
	21st to end	Day	20% 5% 11% 25% 29% 9%	2660
July	1st to 10th	Day	10% 3 6% 12% 26% 43%	4351
	11th to 20th	Day	10% 3 5% 9% 22% 52%	4345
	21st to end	Day	10% 2 4 15% 35% 34%	4639
August	1st to 10th	Day	20% 4 6% 15% 31% 24%	4384
	11th to 20th	Day	15% 3 5% 22% 35% 20%	3990
	21st to end	Day	14% 3 7% 28% 27% 21%	4179
September	1st to 10th	Day	14% 4 8% 22% 31% 21%	2280
	11th to 20th	Day	23% 7% 12% 22% 24% 12%	2178
	21st to end	Day	24% 6% 10% 29% 23% 7%	2090
October	1st to 10th	Day	32% 8% 9% 25% 22% 5%	2021
	11th to 20th	Day	31% 7% 13% 29% 17% 3	1848
	21st to end	Day	38% 9% 16% 24% 11% 1	1881
November	1st to 10th	Day	44% 10% 17% 20% 8% 1	1674
	11th to 20th	Day	44% 14% 18% 19% 4 1	1710
	21st to end	Day	41% 12% 21% 18% 7% 1	1525
December	1st to 10th	Day	52% 13% 16% 14% 5%	1520
	11th to 20th	Day	57% 17% 14% 9% 2	1928
	21st to end	Day	50% 19% 16% 11% 4	2794
January	1st to 10th	Night	52% 20% 17% 8% 2	4406
	11th to 20th	Night	55% 13% 16% 13% 3	4420
	21st to end	Night	57% 16% 14% 10% 2	4862
February	1st to 10th	Night	48% 12% 18% 17% 4	2548
	11th to 20th	Night	45% 11% 18% 17% 9%	2243
	21st to end	Night	46% 13% 14% 18% 6% 2	1884
March	1st to 10th	Night	38% 13% 15% 24% 11% 1	3736
	11th to 20th	Night	30% 8% 12% 39% 11%	3725
	21st to end	Night	41% 18% 19% 16% 6%	3488
April	1st to 10th	Night	42% 9% 18% 23% 7% 1	1900
	11th to 20th	Night	37% 8% 14% 25% 13% 2	1879
	21st to end	Night	33% 10% 18% 24% 15% 1	1720
May	1st to 10th	Night	30% 9% 15% 30% 16% 1	2769
	11th to 20th	Night	19% 6% 10% 36% 27% 1	2516
	21st to end	Night	31% 10% 22% 29% 8%	2762
June	1st to 10th	Night	33% 10% 18% 28% 10% 1	1520
	11th to 20th	Night	28% 8% 14% 29% 18% 4	1520
	21st to end	Night	16% 5% 13% 33% 26% 7%	1520
July	1st to 10th	Night	7% 3 5% 15% 25% 45%	2500
	11th to 20th	Night	6% 2 5% 12% 27% 49%	2492
	21st to end	Night	11% 2 4 17% 34% 31%	2674
August	1st to 10th	Night	18% 4 6% 15% 36% 21%	2521
	11th to 20th	Night	11% 3 5% 26% 39% 16%	2899
	21st to end	Night	14% 3 7% 28% 29% 20%	3498
September	1st to 10th	Night	13% 4 7% 26% 30% 20%	1900
	11th to 20th	Night	21% 6% 10% 23% 25% 14%	2001
	21st to end	Night	21% 5% 9% 29% 26% 10%	2090
October	1st to 10th	Night	27% 7% 12% 25% 23% 6%	2156
	11th to 20th	Night	29% 7% 14% 26% 21% 3	2332
	21st to end	Night	34% 9% 16% 22% 17% 1	2717
November	1st to 10th	Night	43% 11% 13% 21% 11% 1	2411
	11th to 20th	Night	44% 11% 18% 21% 6%	2470
	21st to end	Night	37% 10% 20% 20% 12% 1	2652
December	1st to 10th	Night	45% 15% 17% 15% 7% 1	2660
	11th to 20th	Night	53% 15% 18% 11% 3	3276
	21st to end	Night	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
Month	Days in Month		Occurrence of each Forecast	Data Points
January	1st to 10th	Day	15% 11% 32% 24% 14% 4	180
	11th to 20th	Day	11% 17% 29% 26% 14% 4	180
	21st to end	Day	7% 13% 33% 32% 12% 3	198
February	1st to 10th	Day	12% 19% 35% 26% 8% 1	289
	11th to 20th	Day	8% 22% 36% 24% 9% 1	443
	21st to end	Day	7% 22% 37% 25% 8% 1	382
March	1st to 10th	Day	11% 22% 36% 26% 5%	460
	11th to 20th	Day	10% 17% 33% 25% 13% 2	460
	21st to end	Day	14% 21% 30% 23% 11% 1	506
April	1st to 10th	Day	15% 22% 28% 21% 11% 3	460
	11th to 20th	Day	13% 23% 33% 19% 9% 4	452
	21st to end	Day	12% 19% 35% 22% 10% 2	460
May	1st to 10th	Day	10% 22% 29% 25% 10% 4	463
	11th to 20th	Day	16% 16% 29% 20% 15% 4	488
	21st to end	Day	12% 12% 26% 28% 18% 5%	529
June	1st to 10th	Day	10% 14% 29% 24% 17% 5%	490
	11th to 20th	Day	10% 18% 32% 27% 9% 3	490
	21st to end	Day	3 11% 30% 31% 19% 6%	490
July	1st to 10th	Day	3 8% 31% 37% 18% 3	486
	11th to 20th	Day	2 8% 34% 32% 21% 3	484
	21st to end	Day	1 5% 29% 36% 23% 6%	531
August	1st to 10th	Day	5% 5% 29% 32% 22% 7%	487
	11th to 20th	Day	3 5% 22% 33% 27% 9%	477
	21st to end	Day	5% 8% 26% 29% 22% 9%	539
September	1st to 10th	Day	3 8% 21% 35% 23% 10%	490
	11th to 20th	Day	7% 8% 24% 32% 22% 7%	490
	21st to end	Day	7% 10% 28% 33% 18% 4	490
October	1st to 10th	Day	10% 12% 26% 27% 21% 5%	490
	11th to 20th	Day	8% 12% 29% 27% 19% 5%	438
	21st to end	Day	11% 17% 25% 28% 15% 4	330
November	1st to 10th	Day	14% 13% 29% 29% 14%	270
	11th to 20th	Day	8% 11% 31% 34% 13% 3	270
	21st to end	Day	10% 13% 29% 34% 12% 2	183
December	1st to 10th	Day	13% 14% 27% 25% 14% 6%	180
	11th to 20th	Day	13% 18% 37% 24% 7% 1	180
	21st to end	Day	5% 15% 37% 28% 11% 4	198
January	1st to 10th	Night	10% 9% 29% 32% 16% 3	760
	11th to 20th	Night	10% 11% 25% 33% 17% 4	760
	21st to end	Night	10% 7% 24% 36% 19% 3	836
February	1st to 10th	Night	12% 9% 29% 36% 12% 2	760
	11th to 20th	Night	9% 9% 28% 33% 19% 2	744
	21st to end	Night	9% 9% 34% 31% 15% 2	628
March	1st to 10th	Night	8% 9% 29% 38% 16% 1	760
	11th to 20th	Night	9% 9% 26% 35% 19% 2	760
	21st to end	Night	8% 11% 28% 39% 13% 1	836
April	1st to 10th	Night	9% 10% 26% 36% 17% 3	760
	11th to 20th	Night	9% 10% 31% 31% 16% 3	751
	21st to end	Night	9% 9% 29% 37% 15% 1	580
May	1st to 10th	Night	8% 11% 30% 34% 15% 2	518
	11th to 20th	Night	10% 6% 19% 34% 28% 3	374
	21st to end	Night	7% 4 24% 37% 26% 2	411
June	1st to 10th	Night	7% 6% 23% 41% 21% 2	380
	11th to 20th	Night	8% 7% 27% 38% 18% 2	380
	21st to end	Night	4 2 20% 51% 22% 1	380
July	1st to 10th	Night	1 4 18% 52% 22% 3	370
	11th to 20th	Night	1 2 22% 57% 18% 1	368
	21st to end	Night	1 2 18% 53% 24% 1	416
August	1st to 10th	Night	3 2 15% 49% 28% 2	378
	11th to 20th	Night	2 2 18% 43% 30% 5%	598
	21st to end	Night	2 3 18% 43% 30% 4	836
September	1st to 10th	Night	3 3 18% 40% 32% 5%	760
	11th to 20th	Night	4 2 16% 37% 34% 7%	760
	21st to end	Night	6% 4 17% 38% 29% 6%	760
October	1st to 10th	Night	8% 3 20% 37% 27% 4	760
	11th to 20th	Night	7% 6% 19% 39% 22% 7%	760
	21st to end	Night	8% 8% 22% 38% 21% 4	836
November	1st to 10th	Night	10% 8% 21% 39% 20% 1	742
	11th to 20th	Night	9% 10% 26% 36% 16% 3	760
	21st to end	Night	8% 5% 28% 35% 19% 5%	760
December	1st to 10th	Night	10% 8% 27% 33% 20% 3	760
	11th to 20th	Night	11% 9% 27% 37% 13% 2	760
	21st to end	Night	13% 13% 29% 34% 10% 1	836

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