Bakersfield
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Bakersfield clear sky chart from 2005-11-06 to 2024-11-04.

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 3 1 3 2 2 3 2 4 5% 71%	104842
	Night	6% 4 1 3 2 2 3 2 4 5% 67%	102948
Transparency	Day	17% 3 6% 19% 27% 29%	104598
	Night	21% 3 7% 20% 25% 23%	102783
Seeing	Day	5% 3 11% 30% 33% 17%	15459
	Night	7% 3 8% 37% 38% 7%	25113

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	10% 8% 3 7% 4 4 5% 4 5% 7% 44%	2539
	11th to 20th	Day	9% 6% 3 6% 4 4 4 4 6% 8% 46%	2800
	21st to end	Day	13% 7% 3 7% 5% 5% 6% 5% 7% 8% 36%	3184
February	1st to 10th	Day	10% 6% 2 4 4 3 4 3 4 6% 54%	1900
	11th to 20th	Day	9% 5% 2 4 3 4 4 3 6% 8% 53%	1850
	21st to end	Day	10% 6% 2 6% 4 4 3 3 6% 6% 51%	1570
March	1st to 10th	Day	11% 6% 3 6% 5% 4 5% 4 6% 8% 41%	3138
	11th to 20th	Day	5% 3 2 4 3 3 3 3 4 8% 61%	3356
	21st to end	Day	7% 5% 2 6% 4 5% 5% 5% 7% 8% 45%	4131
April	1st to 10th	Day	6% 3 2 3 3 3 3 3 5% 7% 61%	2280
	11th to 20th	Day	5% 3 1 4 3 2 3 3 4 6% 66%	2249
	21st to end	Day	5% 3 1 2 2 2 2 3 4 7% 68%	2280
May	1st to 10th	Day	2 1 2 1 2 2 2 3 5% 81%	3861
	11th to 20th	Day	2 1 1 1 1 1 1 2 3 6% 81%	4071
	21st to end	Day	2 1 1 1 1 2 1 2 3 85%	4559
June	1st to 10th	Day	2 2 1 1 2 1 2 2 4 6% 78%	2660
	11th to 20th	Day	1 1 1 1 1 1 2 3 90%	2660
	21st to end	Day	1 1 1 1 1 1 1 1 2 3 89%	2660
July	1st to 10th	Day	1 1 1 1 1 2 93%	4420
	11th to 20th	Day	1 1 2 1 2 2 1 3 3 85%	4420
	21st to end	Day	1 1 1 1 1 1 1 2 4 87%	4377
August	1st to 10th	Day	1 1 1 1 1 1 1 2 2 87%	3783
	11th to 20th	Day	1 1 1 1 1 2 2 93%	3724
	21st to end	Day	1 1 1 1 1 2 93%	4180
September	1st to 10th	Day	1 1 1 1 1 1 1 2 3 88%	2280
	11th to 20th	Day	1 1 1 1 1 1 2 3 89%	2193
	21st to end	Day	1 1 1 1 1 2 1 2 3 86%	2090
October	1st to 10th	Day	2 1 1 1 1 1 2 3 4 83%	3429
	11th to 20th	Day	2 1 2 2 2 2 2 4 4 81%	3161
	21st to end	Day	5% 2 1 3 2 3 3 3 4 6% 69%	3427
November	1st to 10th	Day	5% 4 1 3 3 2 3 3 4 7% 64%	1701
	11th to 20th	Day	6% 4 2 4 2 2 3 2 5% 6% 64%	1710
	21st to end	Day	8% 5% 2 3 2 3 3 3 5% 8% 58%	1710
December	1st to 10th	Day	8% 4 2 5% 5% 4 4 3 5% 9% 51%	1710
	11th to 20th	Day	10% 7% 2 7% 5% 5% 6% 4 6% 9% 39%	1985
	21st to end	Day	12% 11% 3 6% 5% 4 5% 4 6% 7% 37%	2794
January	1st to 10th	Night	14% 9% 3 6% 4 4 4 3 5% 6% 43%	4406
	11th to 20th	Night	9% 7% 3 8% 5% 4 4 3 6% 8% 44%	4166
	21st to end	Night	18% 8% 2 6% 4 3 4 3 6% 7% 39%	4480
February	1st to 10th	Night	10% 7% 3 6% 3 3 3 3 4 6% 53%	2280
	11th to 20th	Night	9% 5% 2 3 2 2 3 3 3 8% 59%	2218
	21st to end	Night	13% 6% 1 4 3 4 4 3 4 6% 53%	1884
March	1st to 10th	Night	11% 6% 2 6% 3 3 4 3 6% 10% 46%	3736
	11th to 20th	Night	6% 4 2 4 4 3 4 4 5% 7% 58%	3621
	21st to end	Night	12% 6% 2 7% 4 4 4 4 5% 7% 45%	3520
April	1st to 10th	Night	9% 5% 2 4 4 3 3 2 4 7% 57%	1900
	11th to 20th	Night	5% 3 1 3 3 2 3 3 4 5% 68%	1879
	21st to end	Night	7% 3 1 2 2 1 2 2 3 5% 72%	1900
May	1st to 10th	Night	6% 2 1 2 1 1 1 1 2 3 80%	3116
	11th to 20th	Night	2 1 2 1 1 2 2 3 4 81%	2834
	21st to end	Night	2 1 2 1 1 1 1 2 3 85%	3020
June	1st to 10th	Night	2 2 1 1 2 2 2 2 3 6% 78%	1520
	11th to 20th	Night	1 1 1 1 1 2 3 89%	1520
	21st to end	Night	1 1 1 1 1 4 90%	1520
July	1st to 10th	Night	1 1 1 1 2 2 92%	2540
	11th to 20th	Night	1 1 1 1 1 1 1 2 3 89%	2540
	21st to end	Night	1 1 1 1 1 1 1 2 2 89%	3182
August	1st to 10th	Night	1 1 1 1 1 1 1 2 3 88%	3166
	11th to 20th	Night	1 1 1 1 1 3 93%	3126
	21st to end	Night	1 1 1 1 1 2 92%	3498
September	1st to 10th	Night	1 1 1 1 1 1 1 1 2 91%	1900
	11th to 20th	Night	1 1 1 1 1 1 1 1 2 3 87%	1985
	21st to end	Night	1 1 1 1 1 1 2 4 87%	2090
October	1st to 10th	Night	1 1 1 1 1 1 1 1 2 3 86%	3547
	11th to 20th	Night	2 2 1 1 1 1 2 4 5% 80%	3777
	21st to end	Night	5% 2 1 2 2 2 2 1 2 4 76%	4141
November	1st to 10th	Night	7% 4 1 3 2 2 3 2 4 7% 63%	2450
	11th to 20th	Night	5% 2 1 4 3 3 2 3 4 6% 66%	2470
	21st to end	Night	8% 4 2 5% 3 3 4 4 5% 8% 54%	2470
December	1st to 10th	Night	9% 5% 2 6% 4 3 4 3 5% 6% 53%	2470
	11th to 20th	Night	13% 6% 2 6% 5% 4 5% 4 5% 8% 42%	3214
	21st to end	Night	11% 10% 3 8% 6% 6% 6% 4 6% 6% 36%	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	39% 3 12% 30% 11% 4	2539
	11th to 20th	Day	36% 5% 18% 24% 11% 8%	2800
	21st to end	Day	43% 6% 13% 19% 14% 5%	3184
February	1st to 10th	Day	30% 4 9% 23% 22% 12%	1900
	11th to 20th	Day	28% 4 11% 23% 24% 10%	1860
	21st to end	Day	31% 5% 11% 30% 17% 7%	1570
March	1st to 10th	Day	38% 5% 10% 22% 19% 6%	3138
	11th to 20th	Day	22% 4 13% 33% 17% 10%	3356
	21st to end	Day	32% 8% 12% 28% 15% 4	4131
April	1st to 10th	Day	24% 5% 11% 29% 22% 9%	2280
	11th to 20th	Day	20% 4 10% 31% 24% 12%	2252
	21st to end	Day	17% 4 9% 29% 31% 9%	2280
May	1st to 10th	Day	9% 3 7% 25% 35% 20%	3861
	11th to 20th	Day	8% 2 3 21% 39% 26%	4074
	21st to end	Day	9% 2 3 23% 45% 19%	4559
June	1st to 10th	Day	10% 2 8% 21% 33% 25%	2660
	11th to 20th	Day	3 1 4 14% 35% 42%	2660
	21st to end	Day	4 2 2 8% 29% 55%	2660
July	1st to 10th	Day	3 1 1 4 15% 77%	4351
	11th to 20th	Day	7% 2 2 6% 19% 64%	4345
	21st to end	Day	5% 1 2 15% 30% 47%	4239
August	1st to 10th	Day	6% 1 2 8% 36% 46%	3770
	11th to 20th	Day	2 1 1 5% 29% 61%	3760
	21st to end	Day	3 1 2 8% 35% 51%	4179
September	1st to 10th	Day	4 2 3 8% 29% 53%	2280
	11th to 20th	Day	5% 1 2 17% 43% 32%	2193
	21st to end	Day	7% 1 2 17% 38% 35%	2090
October	1st to 10th	Day	8% 2 3 12% 24% 51%	3429
	11th to 20th	Day	9% 2 4 25% 34% 25%	3161
	21st to end	Day	17% 3 4 15% 35% 27%	3427
November	1st to 10th	Day	21% 3 9% 22% 30% 16%	1701
	11th to 20th	Day	21% 3 10% 23% 25% 18%	1710
	21st to end	Day	25% 5% 7% 21% 24% 19%	1710
December	1st to 10th	Day	29% 5% 10% 23% 19% 14%	1710
	11th to 20th	Day	38% 6% 13% 19% 17% 7%	1985
	21st to end	Day	46% 5% 11% 23% 12% 4	2794
January	1st to 10th	Night	43% 4 10% 27% 13% 3	4406
	11th to 20th	Night	39% 4 18% 23% 9% 8%	4166
	21st to end	Night	45% 4 13% 18% 14% 5%	4480
February	1st to 10th	Night	33% 4 8% 24% 21% 11%	2280
	11th to 20th	Night	26% 4 10% 27% 25% 8%	2219
	21st to end	Night	34% 4 11% 28% 18% 5%	1884
March	1st to 10th	Night	35% 6% 11% 25% 19% 3	3736
	11th to 20th	Night	26% 7% 11% 34% 16% 6%	3621
	21st to end	Night	39% 4 12% 28% 15% 2	3520
April	1st to 10th	Night	29% 5% 10% 30% 19% 8%	1900
	11th to 20th	Night	21% 4 11% 27% 27% 11%	1879
	21st to end	Night	18% 4 8% 33% 31% 6%	1900
May	1st to 10th	Night	14% 2 4 22% 40% 18%	3116
	11th to 20th	Night	9% 2 3 19% 42% 24%	2835
	21st to end	Night	9% 3 3 23% 42% 20%	3020
June	1st to 10th	Night	11% 3 6% 20% 36% 24%	1520
	11th to 20th	Night	3 2 5% 15% 35% 41%	1520
	21st to end	Night	3 1 2 8% 32% 54%	1520
July	1st to 10th	Night	2 1 1 4 14% 78%	2500
	11th to 20th	Night	5% 1 1 7% 16% 70%	2492
	21st to end	Night	5% 1 2 13% 30% 50%	3083
August	1st to 10th	Night	6% 1 2 11% 33% 47%	3156
	11th to 20th	Night	2 1 1 6% 29% 60%	3156
	21st to end	Night	2 1 1 8% 32% 55%	3498
September	1st to 10th	Night	5% 1 3 9% 31% 51%	1900
	11th to 20th	Night	6% 1 3 16% 46% 28%	1985
	21st to end	Night	5% 2 2 19% 40% 32%	2090
October	1st to 10th	Night	7% 2 4 10% 29% 48%	3547
	11th to 20th	Night	9% 2 4 27% 36% 22%	3777
	21st to end	Night	15% 2 3 20% 36% 23%	4141
November	1st to 10th	Night	22% 3 9% 24% 25% 16%	2450
	11th to 20th	Night	20% 3 12% 22% 26% 17%	2470
	21st to end	Night	29% 4 7% 21% 25% 14%	2470
December	1st to 10th	Night	30% 5% 11% 19% 20% 14%	2470
	11th to 20th	Night	38% 5% 15% 20% 17% 5%	3214
	21st to end	Night	47% 5% 11% 24% 10% 3	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	14% 6% 11% 36% 28% 6%	180
	11th to 20th	Day	12% 3 12% 37% 30% 7%	336
	21st to end	Day	10% 5% 13% 34% 28% 9%	420
February	1st to 10th	Day	11% 3 15% 33% 28% 10%	460
	11th to 20th	Day	11% 7% 15% 35% 26% 8%	455
	21st to end	Day	11% 7% 16% 37% 26% 4	382
March	1st to 10th	Day	11% 6% 22% 37% 20% 4	460
	11th to 20th	Day	8% 6% 16% 37% 26% 5%	460
	21st to end	Day	7% 8% 23% 39% 20% 4	506
April	1st to 10th	Day	7% 6% 19% 29% 29% 10%	460
	11th to 20th	Day	6% 7% 18% 33% 26% 11%	452
	21st to end	Day	5% 5% 17% 27% 28% 18%	460
May	1st to 10th	Day	4 4 19% 31% 32% 11%	463
	11th to 20th	Day	5% 3 16% 28% 30% 19%	488
	21st to end	Day	4 4 13% 29% 33% 16%	529
June	1st to 10th	Day	2 2 13% 28% 32% 23%	490
	11th to 20th	Day	1 1 11% 26% 42% 19%	490
	21st to end	Day	1 1 8% 24% 43% 23%	490
July	1st to 10th	Day	1 3 24% 44% 28%	486
	11th to 20th	Day	1 2 20% 37% 39%	484
	21st to end	Day	2 1 21% 41% 35%	531
August	1st to 10th	Day	1 1 6% 28% 35% 29%	487
	11th to 20th	Day	1 4 27% 36% 32%	477
	21st to end	Day	1 2 27% 40% 29%	539
September	1st to 10th	Day	1 1 4 29% 41% 24%	490
	11th to 20th	Day	1 9% 36% 38% 15%	490
	21st to end	Day	1 1 11% 31% 34% 21%	490
October	1st to 10th	Day	1 2 12% 35% 34% 17%	490
	11th to 20th	Day	3 2 13% 26% 41% 15%	490
	21st to end	Day	5% 1 10% 32% 38% 14%	530
November	1st to 10th	Day	8% 1 8% 30% 38% 15%	279
	11th to 20th	Day	9% 1 5% 34% 36% 15%	270
	21st to end	Day	8% 3 10% 31% 37% 10%	270
December	1st to 10th	Day	10% 2 11% 41% 30% 6%	270
	11th to 20th	Day	13% 4 8% 30% 28% 17%	207
	21st to end	Day	19% 6% 12% 32% 25% 7%	198
January	1st to 10th	Night	14% 4 13% 35% 27% 8%	760
	11th to 20th	Night	10% 2 11% 42% 28% 7%	760
	21st to end	Night	15% 3 11% 40% 28% 4	836
February	1st to 10th	Night	11% 4 11% 42% 26% 7%	760
	11th to 20th	Night	11% 4 10% 41% 27% 6%	744
	21st to end	Night	15% 4 12% 41% 25% 3	628
March	1st to 10th	Night	11% 6% 12% 47% 21% 3	760
	11th to 20th	Night	9% 5% 10% 39% 31% 6%	760
	21st to end	Night	11% 6% 12% 41% 26% 3	836
April	1st to 10th	Night	9% 4 13% 45% 26% 4	760
	11th to 20th	Night	6% 4 14% 41% 31% 3	751
	21st to end	Night	7% 4 12% 40% 31% 6%	760
May	1st to 10th	Night	7% 3 9% 48% 30% 3	722
	11th to 20th	Night	4 2 12% 39% 40% 3	561
	21st to end	Night	4 5% 12% 41% 35% 3	566
June	1st to 10th	Night	2 3 6% 43% 43% 3	380
	11th to 20th	Night	1 5% 45% 47% 3	380
	21st to end	Night	1 1 3 41% 49% 6%	380
July	1st to 10th	Night	1 25% 68% 6%	370
	11th to 20th	Night	1 1 19% 69% 10%	368
	21st to end	Night	1 1 15% 67% 17%	661
August	1st to 10th	Night	1 3 26% 59% 11%	756
	11th to 20th	Night	1 1 23% 63% 12%	752
	21st to end	Night	1 1 19% 63% 16%	836
September	1st to 10th	Night	1 1 2 22% 62% 13%	760
	11th to 20th	Night	1 4 33% 53% 8%	760
	21st to end	Night	1 1 6% 32% 50% 10%	760
October	1st to 10th	Night	3 2 6% 41% 40% 9%	760
	11th to 20th	Night	5% 2 6% 36% 41% 10%	760
	21st to end	Night	5% 1 7% 38% 36% 14%	836
November	1st to 10th	Night	8% 3 8% 34% 35% 11%	754
	11th to 20th	Night	7% 1 6% 39% 38% 9%	760
	21st to end	Night	10% 3 10% 37% 32% 8%	760
December	1st to 10th	Night	10% 3 8% 41% 32% 5%	760
	11th to 20th	Night	14% 4 9% 41% 26% 6%	760
	21st to end	Night	16% 4 12% 40% 23% 5%	836

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