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 2024-04-03.

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% 3 1 3 3 2 3 3 4 6% 67%	79045
	Night	7% 4 2 3 3 2 3 3 4 6% 63%	81115
Transparency	Day	19% 3 8% 20% 26% 24%	78764
	Night	24% 4 9% 21% 24% 18%	80919
Seeing	Day	5% 3 12% 31% 33% 16%	14604
	Night	7% 3 8% 37% 38% 7%	24385

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 6% 5% 3 5% 5% 5% 7% 44%	2539
	11th to 20th	Day	9% 6% 3 5% 5% 3 4 6% 6% 8% 46%	2800
	21st to end	Day	13% 6% 3 6% 6% 3 6% 6% 7% 8% 36%	3184
February	1st to 10th	Day	10% 5% 2 4 4 3 4 3 4 6% 54%	1900
	11th to 20th	Day	9% 4 2 3 4 3 4 4 5% 8% 53%	1850
	21st to end	Day	10% 5% 2 5% 5% 3 4 4 5% 6% 51%	1570
March	1st to 10th	Day	10% 5% 3 5% 5% 2 5% 6% 6% 9% 45%	1900
	11th to 20th	Day	7% 4 2 4 3 2 4 4 5% 10% 56%	2004
	21st to end	Day	6% 3 2 4 3 3 5% 5% 5% 8% 55%	2486
April	1st to 10th	Day	6% 2 2 3 4 2 4 4 5% 8% 61%	2185
	11th to 20th	Day	6% 3 1 3 3 2 2 3 4 6% 66%	2129
	21st to end	Day	6% 2 1 2 3 1 3 3 3 8% 68%	2160
May	1st to 10th	Day	3 2 1 2 2 2 2 3 4 6% 75%	2195
	11th to 20th	Day	4 2 1 2 2 1 2 2 3 7% 75%	2301
	21st to end	Day	4 2 1 2 2 1 3 3 3 4 75%	2573
June	1st to 10th	Day	3 1 1 1 2 1 2 2 4 6% 78%	2520
	11th to 20th	Day	1 1 1 1 1 2 3 90%	2520
	21st to end	Day	1 1 1 1 1 1 1 2 4 88%	2520
July	1st to 10th	Day	1 1 1 1 1 2 2 2 4 88%	2520
	11th to 20th	Day	1 1 1 2 2 1 2 2 3 3 83%	2520
	21st to end	Day	2 1 1 1 2 1 2 3 3 5% 79%	2504
August	1st to 10th	Day	2 2 1 1 1 1 2 2 3 84%	2149
	11th to 20th	Day	1 1 1 1 1 1 2 3 3 87%	2122
	21st to end	Day	1 1 1 1 2 2 2 3 88%	2376
September	1st to 10th	Day	1 1 1 1 1 1 1 2 3 88%	2160
	11th to 20th	Day	1 1 1 1 1 1 2 3 89%	2078
	21st to end	Day	1 1 1 1 1 2 2 2 4 85%	1980
October	1st to 10th	Day	3 2 1 2 2 2 2 3 3 6% 74%	1945
	11th to 20th	Day	4 1 1 2 2 1 2 2 3 4 78%	1800
	21st to end	Day	3 1 1 2 2 2 2 3 3 6% 75%	1972
November	1st to 10th	Day	5% 3 2 3 3 2 3 3 4 6% 65%	1674
	11th to 20th	Day	6% 4 2 3 3 2 3 2 5% 6% 64%	1710
	21st to end	Day	8% 4 2 3 2 2 3 4 5% 8% 58%	1710
December	1st to 10th	Day	8% 4 2 4 5% 3 5% 3 5% 9% 52%	1710
	11th to 20th	Day	10% 6% 3 6% 6% 3 6% 5% 6% 9% 40%	1985
	21st to end	Day	12% 11% 3 6% 5% 3 5% 5% 6% 7% 37%	2794
January	1st to 10th	Night	14% 9% 3 5% 5% 3 4 4 4 6% 43%	4406
	11th to 20th	Night	9% 7% 3 6% 6% 3 4 4 6% 8% 45%	4166
	21st to end	Night	18% 7% 3 6% 5% 2 4 4 6% 8% 39%	4480
February	1st to 10th	Night	10% 6% 3 5% 4 2 3 3 4 6% 53%	2280
	11th to 20th	Night	9% 5% 2 3 3 2 3 3 3 8% 59%	2218
	21st to end	Night	13% 5% 2 4 3 2 4 3 4 6% 53%	1884
March	1st to 10th	Night	10% 5% 2 5% 4 3 5% 4 6% 9% 48%	2280
	11th to 20th	Night	8% 4 2 4 5% 2 4 5% 6% 7% 52%	2173
	21st to end	Night	11% 4 2 5% 4 3 4 4 4 7% 54%	2110
April	1st to 10th	Night	9% 4 2 4 4 2 3 3 4 8% 57%	1820
	11th to 20th	Night	5% 2 2 3 3 2 3 3 4 5% 68%	1779
	21st to end	Night	7% 2 1 2 2 1 2 3 3 5% 72%	1800
May	1st to 10th	Night	7% 2 1 2 2 1 2 3 3 5% 73%	1764
	11th to 20th	Night	4 1 1 3 2 1 3 3 3 5% 74%	1594
	21st to end	Night	4 2 1 3 2 1 2 3 3 6% 74%	1698
June	1st to 10th	Night	2 2 1 1 2 2 2 2 3 5% 78%	1440
	11th to 20th	Night	1 1 1 2 3 4 88%	1440
	21st to end	Night	1 1 1 2 1 4 90%	1440
July	1st to 10th	Night	1 1 1 1 1 2 3 5% 85%	1440
	11th to 20th	Night	1 1 1 1 1 1 2 1 3 4 85%	1440
	21st to end	Night	1 1 1 2 2 1 3 2 3 4 81%	1807
August	1st to 10th	Night	1 1 1 1 1 1 2 2 3 86%	1790
	11th to 20th	Night	1 1 1 1 1 1 2 4 88%	1780
	21st to end	Night	1 1 1 1 2 2 3 88%	1980
September	1st to 10th	Night	1 1 1 1 1 1 1 2 91%	1800
	11th to 20th	Night	1 1 1 1 1 1 1 2 2 3 87%	1880
	21st to end	Night	1 1 1 1 1 1 2 2 4 86%	1980
October	1st to 10th	Night	2 2 1 2 2 1 3 3 3 5% 76%	2011
	11th to 20th	Night	4 2 2 3 1 2 3 3 5% 75%	2160
	21st to end	Night	4 1 1 2 2 1 2 2 3 4 77%	2384
November	1st to 10th	Night	7% 3 2 3 3 2 3 3 4 7% 64%	2405
	11th to 20th	Night	6% 2 2 3 3 2 2 3 4 6% 67%	2470
	21st to end	Night	8% 3 2 4 3 2 4 5% 5% 8% 54%	2470
December	1st to 10th	Night	9% 5% 2 5% 5% 2 4 4 5% 6% 53%	2470
	11th to 20th	Night	13% 6% 2 5% 5% 3 5% 5% 5% 8% 42%	3214
	21st to end	Night	11% 9% 3 7% 6% 4 6% 5% 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	35% 5% 11% 20% 21% 8%	1900
	11th to 20th	Day	25% 4 14% 29% 21% 7%	2004
	21st to end	Day	25% 7% 13% 30% 18% 7%	2486
April	1st to 10th	Day	23% 5% 11% 29% 21% 9%	2185
	11th to 20th	Day	20% 4 10% 30% 24% 12%	2132
	21st to end	Day	17% 4 10% 29% 31% 9%	2160
May	1st to 10th	Day	12% 4 9% 25% 36% 14%	2195
	11th to 20th	Day	14% 2 6% 27% 35% 16%	2304
	21st to end	Day	15% 3 5% 28% 36% 12%	2573
June	1st to 10th	Day	10% 2 9% 21% 33% 25%	2520
	11th to 20th	Day	4 1 4 15% 34% 43%	2520
	21st to end	Day	4 2 3 8% 29% 54%	2520
July	1st to 10th	Day	5% 2 1 7% 26% 59%	2451
	11th to 20th	Day	9% 2 3 10% 27% 49%	2445
	21st to end	Day	9% 2 4 15% 33% 37%	2365
August	1st to 10th	Day	8% 2 3 8% 28% 51%	2135
	11th to 20th	Day	4 2 2 9% 35% 48%	2122
	21st to end	Day	5% 2 2 8% 36% 47%	2376
September	1st to 10th	Day	5% 2 3 9% 29% 53%	2160
	11th to 20th	Day	5% 1 2 17% 42% 33%	2078
	21st to end	Day	7% 1 2 17% 39% 33%	1980
October	1st to 10th	Day	14% 3 5% 21% 27% 30%	1945
	11th to 20th	Day	13% 3 5% 19% 29% 31%	1800
	21st to end	Day	13% 2 5% 22% 30% 29%	1972
November	1st to 10th	Day	20% 3 9% 22% 30% 16%	1674
	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	33% 6% 12% 25% 19% 5%	2280
	11th to 20th	Night	30% 5% 13% 26% 21% 5%	2173
	21st to end	Night	31% 4 12% 33% 17% 3	2110
April	1st to 10th	Night	30% 5% 10% 29% 18% 8%	1820
	11th to 20th	Night	21% 4 11% 25% 27% 11%	1779
	21st to end	Night	17% 4 9% 33% 30% 7%	1800
May	1st to 10th	Night	17% 3 8% 26% 36% 11%	1764
	11th to 20th	Night	15% 3 6% 22% 39% 15%	1595
	21st to end	Night	15% 4 6% 25% 37% 12%	1698
June	1st to 10th	Night	12% 3 7% 20% 35% 24%	1440
	11th to 20th	Night	3 2 5% 15% 33% 41%	1440
	21st to end	Night	3 1 2 8% 33% 53%	1440
July	1st to 10th	Night	4 1 2 8% 25% 60%	1400
	11th to 20th	Night	7% 2 2 11% 25% 53%	1392
	21st to end	Night	8% 2 3 17% 34% 37%	1707
August	1st to 10th	Night	7% 1 3 11% 28% 50%	1780
	11th to 20th	Night	3 2 2 11% 38% 44%	1780
	21st to end	Night	4 1 2 10% 38% 45%	1980
September	1st to 10th	Night	5% 1 3 10% 32% 49%	1800
	11th to 20th	Night	6% 1 2 16% 46% 28%	1880
	21st to end	Night	5% 2 2 19% 41% 31%	1980
October	1st to 10th	Night	13% 4 6% 18% 33% 26%	2011
	11th to 20th	Night	15% 3 6% 23% 28% 26%	2160
	21st to end	Night	13% 3 4 26% 29% 25%	2384
November	1st to 10th	Night	21% 3 9% 24% 26% 16%	2405
	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% 30% 8%	429
	11th to 20th	Day	6% 7% 19% 34% 25% 9%	412
	21st to end	Day	5% 5% 18% 27% 27% 18%	420
May	1st to 10th	Day	4 3 20% 31% 31% 11%	423
	11th to 20th	Day	5% 3 17% 29% 29% 17%	448
	21st to end	Day	5% 4 14% 30% 32% 15%	485
June	1st to 10th	Day	2 2 14% 29% 32% 21%	450
	11th to 20th	Day	1 1 11% 26% 41% 19%	450
	21st to end	Day	1 1 9% 26% 43% 20%	450
July	1st to 10th	Day	1 4 25% 45% 25%	446
	11th to 20th	Day	1 3 21% 37% 38%	444
	21st to end	Day	2 1 22% 41% 33%	487
August	1st to 10th	Day	2 1 6% 30% 36% 26%	447
	11th to 20th	Day	1 4 28% 34% 32%	437
	21st to end	Day	1 2 28% 40% 28%	495
September	1st to 10th	Day	1 1 4 30% 42% 22%	450
	11th to 20th	Day	1 9% 36% 39% 14%	450
	21st to end	Day	1 1 12% 31% 34% 20%	450
October	1st to 10th	Day	1 2 13% 37% 33% 14%	450
	11th to 20th	Day	4 2 14% 26% 42% 13%	450
	21st to end	Day	4 1 10% 34% 38% 13%	487
November	1st to 10th	Day	7% 1 7% 31% 38% 15%	270
	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 12% 46% 25% 4	728
	11th to 20th	Night	6% 4 14% 41% 31% 4	711
	21st to end	Night	7% 4 12% 40% 31% 6%	720
May	1st to 10th	Night	7% 3 9% 48% 31% 4	684
	11th to 20th	Night	5% 2 13% 38% 40% 3	531
	21st to end	Night	4 5% 13% 41% 34% 3	536
June	1st to 10th	Night	3 3 6% 43% 43% 3	360
	11th to 20th	Night	1 4 44% 48% 3	360
	21st to end	Night	1 1 3 41% 49% 6%	360
July	1st to 10th	Night	1 25% 68% 7%	350
	11th to 20th	Night	1 1 19% 69% 10%	348
	21st to end	Night	1 15% 68% 16%	625
August	1st to 10th	Night	1 3 27% 59% 10%	716
	11th to 20th	Night	1 1 22% 64% 13%	712
	21st to end	Night	1 1 18% 65% 16%	792
September	1st to 10th	Night	1 1 2 22% 62% 13%	720
	11th to 20th	Night	1 4 32% 54% 8%	720
	21st to end	Night	1 1 5% 31% 51% 11%	720
October	1st to 10th	Night	3 2 6% 42% 38% 9%	720
	11th to 20th	Night	5% 2 6% 36% 41% 10%	720
	21st to end	Night	5% 1 7% 38% 35% 14%	792
November	1st to 10th	Night	8% 3 8% 34% 35% 11%	740
	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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