Bodie
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Bodie clear sky chart from 2005-11-06 to 2024-11-10.

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	2 3 2 5% 3 3 3 3 5% 7% 64%	105074
	Night	1 3 2 4 3 3 3 3 5% 7% 65%	102797
Transparency	Day	19% 5% 8% 18% 26% 23%	104817
	Night	18% 5% 9% 22% 27% 18%	102644
Seeing	Day	8% 11% 21% 28% 22% 10%	15125
	Night	4 4 19% 42% 25% 6%	24574

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	1 3 1 6% 4 4 4 5% 7% 11% 54%	2539
	11th to 20th	Day	1 4 2 6% 4 4 6% 5% 8% 10% 51%	2576
	21st to end	Day	2 6% 3 7% 5% 5% 5% 5% 8% 10% 46%	3146
February	1st to 10th	Day	5% 1 6% 3 3 4 4 6% 9% 59%	1805
	11th to 20th	Day	1 4 2 5% 4 4 4 4 6% 11% 55%	1850
	21st to end	Day	3 2 5% 4 4 5% 4 5% 8% 60%	1570
March	1st to 10th	Day	3 2 8% 5% 6% 6% 5% 8% 10% 46%	3138
	11th to 20th	Day	2 2 6% 3 3 4 4 6% 12% 57%	3332
	21st to end	Day	6% 3 6% 4 4 4 4 6% 10% 53%	4134
April	1st to 10th	Day	2 4 2 6% 4 4 4 3 6% 8% 57%	2280
	11th to 20th	Day	1 4 1 4 4 4 4 3 6% 8% 60%	2249
	21st to end	Day	2 4 1 5% 3 4 3 3 4 8% 62%	2280
May	1st to 10th	Day	1 3 1 4 2 3 3 2 5% 7% 69%	4034
	11th to 20th	Day	2 4 1 4 2 3 3 3 5% 6% 68%	4101
	21st to end	Day	3 5% 2 5% 3 3 3 3 4 5% 64%	4813
June	1st to 10th	Day	3 4 2 5% 4 3 4 4 5% 7% 59%	2660
	11th to 20th	Day	2 2 1 2 2 3 3 2 4 5% 74%	2660
	21st to end	Day	3 3 2 3 3 3 3 3 3 4 71%	2660
July	1st to 10th	Day	2 2 1 2 2 2 2 2 3 4 78%	4420
	11th to 20th	Day	5% 5% 2 6% 4 3 3 3 4 5% 59%	4420
	21st to end	Day	4 4 2 5% 3 4 4 3 4 4 64%	4731
August	1st to 10th	Day	4 4 2 4 3 3 4 3 4 4 64%	3889
	11th to 20th	Day	2 2 1 3 2 2 2 2 2 3 79%	3724
	21st to end	Day	2 2 1 2 1 1 2 1 2 2 82%	4180
September	1st to 10th	Day	2 3 1 3 2 2 3 2 3 3 76%	2280
	11th to 20th	Day	2 3 1 4 2 2 3 2 4 4 73%	2204
	21st to end	Day	1 2 1 3 3 1 2 2 3 5% 77%	2090
October	1st to 10th	Day	3 3 1 3 3 2 3 2 3 5% 71%	3366
	11th to 20th	Day	2 2 1 2 2 2 2 1 3 4 79%	3161
	21st to end	Day	1 2 1 4 4 3 3 3 4 8% 69%	3305
November	1st to 10th	Day	1 3 1 5% 4 3 3 3 5% 8% 66%	1755
	11th to 20th	Day	1 2 1 2 3 3 3 3 5% 10% 67%	1710
	21st to end	Day	1 3 1 4 3 3 3 4 6% 12% 61%	1710
December	1st to 10th	Day	1 3 1 4 3 3 4 4 6% 9% 62%	1580
	11th to 20th	Day	2 6% 3 8% 5% 5% 5% 5% 7% 9% 44%	1928
	21st to end	Day	1 6% 2 7% 5% 5% 5% 5% 7% 11% 45%	2794
January	1st to 10th	Night	1 3 3 7% 4 5% 4 4 6% 8% 55%	4406
	11th to 20th	Night	1 4 3 6% 4 5% 5% 5% 8% 9% 51%	4380
	21st to end	Night	2 6% 2 7% 5% 4 5% 5% 8% 9% 46%	4521
February	1st to 10th	Night	1 3 2 6% 4 5% 4 5% 6% 7% 56%	2373
	11th to 20th	Night	4 1 5% 3 3 4 3 6% 11% 58%	2218
	21st to end	Night	4 2 5% 3 3 4 4 6% 8% 61%	1884
March	1st to 10th	Night	4 2 7% 5% 6% 5% 5% 9% 9% 48%	3736
	11th to 20th	Night	1 3 2 5% 3 3 4 4 7% 8% 59%	3645
	21st to end	Night	4 2 6% 3 4 4 4 7% 9% 56%	3519
April	1st to 10th	Night	1 4 1 5% 3 4 4 4 5% 8% 60%	1900
	11th to 20th	Night	1 4 1 4 4 4 3 3 5% 7% 65%	1879
	21st to end	Night	2 5% 1 4 3 3 3 2 4 5% 69%	1900
May	1st to 10th	Night	1 3 1 3 2 2 2 2 3 5% 76%	2936
	11th to 20th	Night	2 2 1 2 2 2 2 2 4 5% 74%	2785
	21st to end	Night	2 4 1 4 2 3 3 3 3 5% 70%	2762
June	1st to 10th	Night	4 2 1 3 3 3 4 4 5% 7% 65%	1520
	11th to 20th	Night	2 2 1 2 1 1 2 2 3 5% 79%	1520
	21st to end	Night	2 2 1 2 3 2 2 1 2 3 79%	1520
July	1st to 10th	Night	1 1 1 1 1 1 2 3 3 87%	2540
	11th to 20th	Night	4 6% 2 5% 3 3 3 3 4 6% 60%	2540
	21st to end	Night	2 3 1 3 3 3 2 3 4 4 72%	2817
August	1st to 10th	Night	2 3 2 3 2 2 3 3 4 5% 72%	3057
	11th to 20th	Night	2 1 1 2 1 1 1 1 2 2 84%	3126
	21st to end	Night	1 1 2 1 1 1 1 2 4 85%	3498
September	1st to 10th	Night	1 1 2 2 1 1 1 3 4 83%	1900
	11th to 20th	Night	2 4 1 3 2 2 2 2 3 4 76%	1976
	21st to end	Night	2 3 1 2 1 1 1 2 2 5% 80%	2090
October	1st to 10th	Night	3 4 1 3 2 2 2 1 3 4 75%	3611
	11th to 20th	Night	1 1 2 1 2 3 2 3 5% 79%	3777
	21st to end	Night	1 2 1 3 3 2 3 2 3 6% 73%	4258
November	1st to 10th	Night	1 2 1 3 3 2 3 3 5% 8% 70%	2528
	11th to 20th	Night	1 2 1 3 2 3 3 3 5% 8% 68%	2470
	21st to end	Night	1 3 2 4 3 3 3 3 5% 9% 65%	2470
December	1st to 10th	Night	1 4 2 4 3 4 4 3 6% 8% 61%	2597
	11th to 20th	Night	1 5% 3 6% 4 5% 5% 5% 9% 12% 47%	3276
	21st to end	Night	1 6% 3 8% 6% 6% 6% 5% 8% 9% 42%	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	20% 7% 19% 30% 21% 3	2539
	11th to 20th	Day	25% 9% 15% 22% 23% 7%	2576
	21st to end	Day	30% 9% 14% 23% 19% 5%	3146
February	1st to 10th	Day	21% 6% 12% 25% 25% 12%	1805
	11th to 20th	Day	22% 6% 10% 24% 28% 10%	1860
	21st to end	Day	21% 6% 12% 28% 27% 6%	1570
March	1st to 10th	Day	25% 9% 12% 26% 19% 8%	3138
	11th to 20th	Day	16% 8% 15% 35% 20% 5%	3332
	21st to end	Day	25% 7% 15% 27% 23% 3	4134
April	1st to 10th	Day	24% 7% 13% 28% 20% 8%	2280
	11th to 20th	Day	20% 6% 12% 28% 25% 9%	2252
	21st to end	Day	21% 5% 12% 30% 25% 6%	2280
May	1st to 10th	Day	15% 4 8% 25% 36% 12%	4034
	11th to 20th	Day	16% 4 7% 21% 37% 14%	4104
	21st to end	Day	21% 5% 7% 21% 38% 8%	4814
June	1st to 10th	Day	24% 5% 8% 19% 31% 13%	2660
	11th to 20th	Day	13% 4 6% 16% 34% 26%	2660
	21st to end	Day	18% 2 3 9% 28% 38%	2660
July	1st to 10th	Day	11% 1 3 7% 11% 67%	4351
	11th to 20th	Day	27% 2 6% 8% 13% 44%	4345
	21st to end	Day	22% 4 5% 10% 17% 43%	4581
August	1st to 10th	Day	22% 3 5% 8% 23% 39%	3874
	11th to 20th	Day	12% 2 2 5% 15% 63%	3760
	21st to end	Day	11% 1 1 7% 29% 51%	4179
September	1st to 10th	Day	14% 3 4 7% 26% 46%	2280
	11th to 20th	Day	15% 3 5% 16% 32% 30%	2204
	21st to end	Day	12% 3 3 16% 34% 32%	2090
October	1st to 10th	Day	15% 2 6% 10% 35% 33%	3366
	11th to 20th	Day	12% 2 3 12% 45% 27%	3161
	21st to end	Day	16% 2 6% 19% 42% 16%	3305
November	1st to 10th	Day	17% 3 10% 23% 31% 15%	1755
	11th to 20th	Day	13% 5% 11% 23% 35% 13%	1710
	21st to end	Day	17% 5% 11% 25% 30% 13%	1710
December	1st to 10th	Day	16% 8% 14% 25% 26% 11%	1580
	11th to 20th	Day	29% 11% 12% 23% 17% 8%	1928
	21st to end	Day	28% 9% 16% 21% 20% 5%	2794
January	1st to 10th	Night	25% 5% 15% 30% 21% 4	4406
	11th to 20th	Night	23% 8% 16% 28% 19% 6%	4380
	21st to end	Night	27% 10% 13% 27% 17% 5%	4521
February	1st to 10th	Night	24% 6% 11% 25% 23% 11%	2373
	11th to 20th	Night	20% 5% 11% 27% 29% 9%	2219
	21st to end	Night	19% 5% 14% 30% 25% 7%	1884
March	1st to 10th	Night	25% 7% 11% 27% 23% 7%	3736
	11th to 20th	Night	18% 8% 12% 37% 20% 4	3645
	21st to end	Night	21% 6% 15% 29% 26% 3	3519
April	1st to 10th	Night	21% 6% 14% 32% 20% 7%	1900
	11th to 20th	Night	20% 5% 12% 30% 25% 9%	1879
	21st to end	Night	19% 4 14% 36% 24% 4	1900
May	1st to 10th	Night	13% 3 6% 33% 36% 8%	2936
	11th to 20th	Night	13% 4 7% 25% 41% 10%	2786
	21st to end	Night	17% 4 8% 26% 40% 5%	2762
June	1st to 10th	Night	18% 6% 9% 25% 33% 10%	1520
	11th to 20th	Night	10% 3 6% 18% 39% 23%	1520
	21st to end	Night	13% 2 3 15% 30% 36%	1520
July	1st to 10th	Night	6% 1 3 7% 15% 68%	2500
	11th to 20th	Night	26% 1 5% 10% 18% 41%	2492
	21st to end	Night	16% 2 5% 13% 19% 45%	2729
August	1st to 10th	Night	16% 2 6% 11% 26% 38%	3048
	11th to 20th	Night	9% 1 3 7% 18% 61%	3156
	21st to end	Night	8% 1 2 10% 31% 48%	3498
September	1st to 10th	Night	8% 2 3 11% 34% 42%	1900
	11th to 20th	Night	14% 3 6% 17% 32% 29%	1976
	21st to end	Night	11% 2 3 17% 36% 30%	2090
October	1st to 10th	Night	15% 2 6% 13% 38% 26%	3611
	11th to 20th	Night	9% 2 6% 16% 47% 21%	3777
	21st to end	Night	14% 2 6% 19% 39% 21%	4258
November	1st to 10th	Night	13% 5% 10% 28% 31% 13%	2528
	11th to 20th	Night	14% 5% 10% 28% 33% 10%	2470
	21st to end	Night	17% 4 12% 26% 30% 12%	2470
December	1st to 10th	Night	19% 7% 14% 24% 27% 9%	2597
	11th to 20th	Night	25% 10% 14% 25% 22% 5%	3276
	21st to end	Night	31% 11% 12% 19% 21% 6%	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	10% 9% 20% 39% 16% 6%	180
	11th to 20th	Day	5% 10% 23% 31% 22% 9%	203
	21st to end	Day	7% 10% 18% 33% 26% 7%	407
February	1st to 10th	Day	7% 11% 20% 34% 18% 10%	415
	11th to 20th	Day	5% 14% 20% 35% 19% 7%	455
	21st to end	Day	6% 14% 25% 32% 18% 5%	382
March	1st to 10th	Day	6% 13% 23% 36% 16% 5%	460
	11th to 20th	Day	8% 15% 24% 25% 19% 9%	460
	21st to end	Day	9% 15% 27% 30% 18% 1	506
April	1st to 10th	Day	11% 16% 21% 28% 18% 6%	460
	11th to 20th	Day	12% 15% 21% 23% 21% 9%	452
	21st to end	Day	11% 17% 19% 23% 20% 11%	460
May	1st to 10th	Day	12% 11% 24% 29% 17% 7%	463
	11th to 20th	Day	15% 15% 22% 19% 16% 12%	488
	21st to end	Day	16% 12% 17% 21% 20% 14%	529
June	1st to 10th	Day	10% 11% 23% 24% 19% 12%	490
	11th to 20th	Day	9% 18% 22% 26% 16% 9%	490
	21st to end	Day	5% 11% 26% 28% 20% 10%	490
July	1st to 10th	Day	5% 10% 21% 30% 22% 12%	486
	11th to 20th	Day	7% 7% 17% 29% 26% 13%	484
	21st to end	Day	10% 4 18% 31% 22% 15%	531
August	1st to 10th	Day	8% 7% 21% 28% 25% 11%	487
	11th to 20th	Day	7% 8% 22% 29% 23% 12%	477
	21st to end	Day	5% 6% 22% 30% 26% 10%	539
September	1st to 10th	Day	6% 7% 21% 30% 25% 11%	490
	11th to 20th	Day	9% 13% 20% 28% 24% 7%	490
	21st to end	Day	7% 8% 21% 30% 26% 8%	490
October	1st to 10th	Day	8% 13% 21% 26% 21% 11%	490
	11th to 20th	Day	7% 10% 23% 25% 26% 9%	490
	21st to end	Day	8% 10% 22% 24% 26% 9%	458
November	1st to 10th	Day	7% 7% 22% 27% 24% 13%	297
	11th to 20th	Day	4 8% 13% 33% 28% 14%	270
	21st to end	Day	3 7% 17% 31% 30% 11%	270
December	1st to 10th	Day	8% 6% 17% 32% 24% 13%	208
	11th to 20th	Day	7% 9% 15% 37% 19% 12%	180
	21st to end	Day	12% 8% 21% 29% 21% 9%	198
January	1st to 10th	Night	4 6% 23% 38% 19% 10%	760
	11th to 20th	Night	3 6% 21% 45% 19% 7%	760
	21st to end	Night	6% 3 22% 41% 21% 7%	836
February	1st to 10th	Night	3 6% 21% 42% 22% 6%	760
	11th to 20th	Night	3 5% 24% 40% 21% 7%	744
	21st to end	Night	3 6% 27% 44% 15% 4	628
March	1st to 10th	Night	5% 6% 26% 43% 14% 6%	760
	11th to 20th	Night	4 6% 24% 38% 20% 8%	760
	21st to end	Night	3 8% 29% 41% 16% 3	836
April	1st to 10th	Night	4 7% 24% 43% 19% 4	760
	11th to 20th	Night	4 9% 25% 38% 19% 6%	751
	21st to end	Night	6% 8% 19% 40% 22% 6%	760
May	1st to 10th	Night	6% 6% 26% 37% 20% 4	620
	11th to 20th	Night	6% 6% 20% 40% 25% 3	539
	21st to end	Night	8% 3 16% 38% 31% 5%	411
June	1st to 10th	Night	5% 3 12% 45% 31% 3	380
	11th to 20th	Night	3 3 20% 46% 27% 3	380
	21st to end	Night	3 1 13% 53% 26% 4	380
July	1st to 10th	Night	2 8% 52% 33% 5%	370
	11th to 20th	Night	4 1 5% 49% 38% 2	368
	21st to end	Night	4 1 5% 44% 39% 7%	448
August	1st to 10th	Night	4 1 9% 39% 39% 8%	685
	11th to 20th	Night	4 1 12% 41% 35% 7%	752
	21st to end	Night	3 1 11% 41% 37% 6%	836
September	1st to 10th	Night	2 2 9% 41% 37% 8%	760
	11th to 20th	Night	4 2 14% 41% 32% 8%	760
	21st to end	Night	3 3 14% 39% 31% 10%	760
October	1st to 10th	Night	5% 3 13% 43% 28% 8%	760
	11th to 20th	Night	4 4 12% 41% 30% 8%	760
	21st to end	Night	3 3 17% 38% 26% 12%	836
November	1st to 10th	Night	3 2 18% 42% 25% 9%	778
	11th to 20th	Night	3 5% 16% 45% 24% 7%	760
	21st to end	Night	2 6% 17% 42% 27% 6%	760
December	1st to 10th	Night	3 4 23% 44% 19% 6%	760
	11th to 20th	Night	4 5% 26% 41% 19% 5%	760
	21st to end	Night	3 8% 27% 43% 15% 3	836

Page generated at 2024-11-07 03:55:48. Version ac07

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