Carmel
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Carmel clear sky chart from 2005-11-06 to 2024-01-12.

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	8% 6% 2 4 4 2 4 4 5% 10% 50%	74669
	Night	9% 8% 3 5% 5% 3 4 4 5% 8% 47%	75057
Transparency	Day	31% 6% 12% 20% 20% 12%	74392
	Night	35% 6% 10% 17% 19% 13%	74855
Seeing	Day	9% 5% 17% 32% 31% 7%	14389
	Night	11% 4 13% 28% 33% 12%	23910

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	18% 6% 2 5% 4 4 4 5% 4 7% 40%	1669
	11th to 20th	Day	9% 6% 2 4 4 3 5% 5% 5% 8% 51%	1630
	21st to end	Day	14% 7% 3 6% 5% 3 4 4 4 6% 44%	1782
February	1st to 10th	Day	15% 6% 2 2 4 3 5% 5% 5% 6% 48%	1620
	11th to 20th	Day	13% 7% 3 5% 5% 3 5% 5% 4 6% 45%	1693
	21st to end	Day	12% 7% 3 5% 5% 3 4 4 4 6% 46%	1480
March	1st to 10th	Day	14% 8% 3 6% 5% 3 5% 5% 5% 9% 36%	1940
	11th to 20th	Day	14% 8% 3 5% 6% 3 5% 5% 7% 9% 36%	1980
	21st to end	Day	11% 8% 3 4 4 2 4 6% 6% 7% 45%	2214
April	1st to 10th	Day	12% 7% 3 5% 4 2 4 4 6% 9% 43%	2160
	11th to 20th	Day	9% 9% 2 5% 4 2 4 4 5% 8% 48%	2129
	21st to end	Day	9% 8% 2 4 3 2 3 4 5% 9% 51%	2160
May	1st to 10th	Day	7% 7% 2 4 5% 3 4 3 5% 11% 49%	2162
	11th to 20th	Day	7% 7% 3 5% 4 2 3 3 5% 10% 50%	2308
	21st to end	Day	10% 12% 3 6% 4 2 3 3 6% 10% 41%	2723
June	1st to 10th	Day	6% 6% 3 5% 4 2 4 4 5% 10% 48%	2520
	11th to 20th	Day	4 4 2 3 3 2 3 4 5% 12% 59%	2520
	21st to end	Day	3 6% 2 5% 3 2 3 3 5% 11% 58%	2520
July	1st to 10th	Day	1 6% 2 4 4 1 3 4 6% 11% 57%	2473
	11th to 20th	Day	3 4 2 3 3 2 4 4 7% 17% 50%	2340
	21st to end	Day	1 3 2 4 3 3 3 4 6% 16% 54%	2546
August	1st to 10th	Day	3 7% 4 4 3 3 4 5% 7% 16% 45%	2328
	11th to 20th	Day	1 3 2 3 3 2 3 3 6% 15% 59%	2145
	21st to end	Day	1 4 2 4 4 3 4 3 7% 13% 55%	2376
September	1st to 10th	Day	3 3 1 3 2 1 3 2 3 10% 68%	2160
	11th to 20th	Day	4 5% 2 3 3 2 3 3 5% 13% 57%	2160
	21st to end	Day	3 3 1 2 3 2 2 4 5% 8% 67%	1920
October	1st to 10th	Day	4 3 2 3 4 2 2 3 5% 9% 64%	1800
	11th to 20th	Day	5% 4 2 3 3 2 4 3 4 7% 62%	1800
	21st to end	Day	5% 5% 2 4 3 2 3 4 5% 8% 60%	1980
November	1st to 10th	Day	8% 4 2 3 5% 3 4 4 4 8% 56%	1851
	11th to 20th	Day	7% 6% 2 4 4 2 4 4 5% 8% 54%	1710
	21st to end	Day	11% 4 2 4 4 2 3 4 4 8% 54%	1628
December	1st to 10th	Day	10% 5% 2 5% 5% 3 5% 4 7% 10% 43%	1520
	11th to 20th	Day	17% 10% 3 6% 5% 3 5% 5% 6% 7% 33%	1928
	21st to end	Day	14% 8% 4 5% 6% 4 5% 4 6% 8% 37%	2794
January	1st to 10th	Night	13% 8% 3 6% 5% 3 4 5% 5% 8% 41%	2494
	11th to 20th	Night	11% 7% 3 5% 4 3 4 5% 4 8% 46%	2358
	21st to end	Night	14% 7% 2 6% 5% 3 4 5% 4 7% 45%	2574
February	1st to 10th	Night	13% 7% 3 5% 4 2 4 3 4 6% 49%	2340
	11th to 20th	Night	12% 9% 3 5% 5% 3 4 5% 5% 7% 42%	2155
	21st to end	Night	13% 9% 3 5% 4 3 4 4 5% 6% 45%	1776
March	1st to 10th	Night	14% 10% 3 5% 6% 4 6% 4 5% 6% 37%	2016
	11th to 20th	Night	13% 10% 2 5% 4 3 5% 4 5% 8% 39%	1980
	21st to end	Night	11% 9% 3 5% 5% 2 4 4 5% 8% 43%	2142
April	1st to 10th	Night	11% 9% 3 6% 5% 3 4 5% 5% 8% 42%	1800
	11th to 20th	Night	11% 9% 3 6% 4 2 4 4 4 7% 46%	1779
	21st to end	Night	8% 9% 2 6% 3 1 3 5% 5% 10% 48%	1800
May	1st to 10th	Night	6% 10% 3 6% 5% 3 4 3 5% 9% 48%	1795
	11th to 20th	Night	9% 11% 4 8% 5% 3 4 2 4 9% 41%	1584
	21st to end	Night	9% 14% 4 6% 5% 2 4 3 4 7% 39%	1552
June	1st to 10th	Night	7% 12% 3 4 5% 2 4 4 4 9% 47%	1440
	11th to 20th	Night	3 6% 3 5% 4 3 3 4 5% 8% 56%	1440
	21st to end	Night	1 9% 3 5% 5% 2 4 3 4 11% 54%	1440
July	1st to 10th	Night	1 10% 4 7% 5% 2 4 4 4 9% 49%	1482
	11th to 20th	Night	2 6% 5% 5% 5% 3 4 3 6% 14% 48%	1620
	21st to end	Night	1 11% 5% 8% 6% 3 6% 3 7% 12% 38%	1773
August	1st to 10th	Night	3 14% 4 9% 8% 3 6% 3 4 9% 37%	1611
	11th to 20th	Night	1 8% 3 5% 5% 2 6% 3 5% 11% 52%	1755
	21st to end	Night	1 8% 4 7% 5% 3 5% 3 4 10% 50%	1980
September	1st to 10th	Night	3 4 2 4 4 3 4 3 5% 9% 60%	1800
	11th to 20th	Night	4 7% 3 5% 5% 2 3 2 4 10% 55%	1800
	21st to end	Night	3 4 2 4 3 2 2 2 3 9% 66%	2033
October	1st to 10th	Night	6% 4 2 3 3 2 3 3 4 8% 62%	2160
	11th to 20th	Night	6% 4 2 4 5% 3 4 4 5% 8% 56%	2160
	21st to end	Night	5% 6% 2 4 4 2 3 4 4 7% 61%	2376
November	1st to 10th	Night	8% 5% 2 4 4 2 3 4 4 9% 54%	2224
	11th to 20th	Night	8% 6% 2 4 4 2 3 4 6% 8% 52%	2470
	21st to end	Night	8% 4 2 4 3 2 4 4 4 6% 58%	2550
December	1st to 10th	Night	11% 7% 2 5% 4 3 4 3 4 8% 49%	2660
	11th to 20th	Night	16% 8% 3 7% 6% 3 6% 5% 6% 7% 32%	3276
	21st to end	Night	14% 8% 3 7% 6% 3 5% 5% 6% 8% 35%	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	43% 8% 12% 19% 13% 5%	1669
	11th to 20th	Day	31% 7% 13% 18% 17% 13%	1630
	21st to end	Day	40% 7% 10% 11% 23% 9%	1782
February	1st to 10th	Day	36% 6% 9% 17% 20% 12%	1620
	11th to 20th	Day	39% 7% 10% 17% 19% 8%	1702
	21st to end	Day	38% 8% 9% 21% 17% 6%	1480
March	1st to 10th	Day	44% 9% 11% 18% 14% 4	1940
	11th to 20th	Day	43% 8% 12% 17% 15% 5%	1980
	21st to end	Day	37% 9% 16% 21% 15% 3	2214
April	1st to 10th	Day	38% 8% 14% 20% 16% 4	2160
	11th to 20th	Day	34% 7% 12% 23% 17% 6%	2132
	21st to end	Day	30% 8% 16% 25% 17% 5%	2160
May	1st to 10th	Day	29% 9% 14% 21% 23% 5%	2162
	11th to 20th	Day	29% 5% 16% 23% 20% 7%	2311
	21st to end	Day	39% 6% 19% 18% 15% 3	2724
June	1st to 10th	Day	32% 8% 14% 20% 21% 6%	2520
	11th to 20th	Day	22% 4 16% 23% 23% 12%	2520
	21st to end	Day	23% 3 11% 19% 26% 19%	2520
July	1st to 10th	Day	22% 2 9% 19% 25% 22%	2406
	11th to 20th	Day	25% 3 12% 21% 19% 21%	2271
	21st to end	Day	21% 2 12% 23% 22% 19%	2405
August	1st to 10th	Day	32% 2 9% 20% 24% 14%	2312
	11th to 20th	Day	21% 3 13% 21% 23% 20%	2145
	21st to end	Day	24% 2 10% 26% 24% 15%	2376
September	1st to 10th	Day	18% 2 8% 16% 26% 31%	2160
	11th to 20th	Day	23% 4 13% 24% 24% 13%	2160
	21st to end	Day	16% 4 12% 21% 31% 15%	1920
October	1st to 10th	Day	19% 5% 11% 19% 26% 20%	1800
	11th to 20th	Day	23% 4 13% 20% 20% 20%	1800
	21st to end	Day	24% 6% 12% 21% 17% 20%	1980
November	1st to 10th	Day	27% 8% 11% 22% 21% 11%	1851
	11th to 20th	Day	30% 6% 13% 17% 23% 11%	1710
	21st to end	Day	30% 5% 10% 16% 25% 13%	1628
December	1st to 10th	Day	34% 8% 11% 17% 17% 12%	1520
	11th to 20th	Day	50% 8% 10% 13% 15% 5%	1928
	21st to end	Day	43% 9% 12% 21% 11% 4	2794
January	1st to 10th	Night	41% 7% 13% 19% 14% 6%	2494
	11th to 20th	Night	36% 9% 12% 14% 16% 14%	2358
	21st to end	Night	40% 6% 10% 13% 17% 13%	2574
February	1st to 10th	Night	38% 5% 8% 15% 19% 14%	2340
	11th to 20th	Night	40% 7% 9% 15% 21% 8%	2156
	21st to end	Night	38% 8% 10% 23% 14% 6%	1776
March	1st to 10th	Night	47% 7% 11% 15% 14% 6%	2016
	11th to 20th	Night	42% 8% 9% 18% 18% 6%	1980
	21st to end	Night	38% 10% 13% 18% 16% 5%	2142
April	1st to 10th	Night	38% 10% 12% 20% 15% 6%	1800
	11th to 20th	Night	37% 8% 11% 22% 15% 7%	1779
	21st to end	Night	31% 9% 13% 25% 17% 6%	1800
May	1st to 10th	Night	33% 8% 9% 19% 23% 8%	1795
	11th to 20th	Night	37% 7% 11% 18% 21% 7%	1585
	21st to end	Night	42% 8% 13% 17% 16% 4	1552
June	1st to 10th	Night	35% 8% 11% 18% 20% 8%	1440
	11th to 20th	Night	27% 5% 11% 14% 24% 19%	1440
	21st to end	Night	25% 3 5% 18% 24% 24%	1440
July	1st to 10th	Night	30% 4 6% 13% 21% 27%	1440
	11th to 20th	Night	29% 2 8% 17% 19% 25%	1566
	21st to end	Night	40% 2 8% 13% 17% 20%	1674
August	1st to 10th	Night	44% 2 5% 12% 16% 21%	1602
	11th to 20th	Night	30% 2 6% 13% 23% 26%	1755
	21st to end	Night	31% 2 6% 15% 24% 23%	1980
September	1st to 10th	Night	22% 2 6% 13% 22% 35%	1800
	11th to 20th	Night	27% 4 7% 20% 26% 17%	1800
	21st to end	Night	17% 4 8% 21% 31% 19%	2033
October	1st to 10th	Night	23% 3 10% 19% 21% 24%	2160
	11th to 20th	Night	26% 5% 9% 19% 21% 21%	2160
	21st to end	Night	25% 5% 9% 19% 22% 20%	2376
November	1st to 10th	Night	31% 6% 9% 19% 20% 14%	2224
	11th to 20th	Night	32% 5% 12% 18% 22% 11%	2470
	21st to end	Night	27% 6% 9% 19% 22% 16%	2550
December	1st to 10th	Night	35% 7% 9% 17% 18% 14%	2660
	11th to 20th	Night	52% 8% 9% 13% 14% 5%	3276
	21st to end	Night	44% 13% 12% 15% 11% 4	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	22% 9% 18% 27% 19% 5%	330
	11th to 20th	Day	13% 7% 19% 31% 28% 3	344
	21st to end	Day	14% 5% 20% 29% 27% 5%	374
February	1st to 10th	Day	13% 10% 17% 27% 24% 8%	340
	11th to 20th	Day	13% 12% 22% 32% 20% 2	389
	21st to end	Day	10% 11% 24% 34% 19% 2	346
March	1st to 10th	Day	16% 10% 23% 34% 14% 2	420
	11th to 20th	Day	16% 9% 21% 32% 17% 4	420
	21st to end	Day	11% 10% 28% 32% 16% 3	462
April	1st to 10th	Day	15% 8% 24% 32% 19% 2	420
	11th to 20th	Day	10% 9% 29% 31% 18% 2	412
	21st to end	Day	7% 8% 27% 29% 22% 7%	420
May	1st to 10th	Day	8% 9% 24% 28% 26% 5%	423
	11th to 20th	Day	13% 4 22% 33% 21% 6%	448
	21st to end	Day	15% 6% 20% 32% 21% 6%	485
June	1st to 10th	Day	6% 5% 18% 39% 24% 8%	450
	11th to 20th	Day	3 2 21% 36% 33% 4	450
	21st to end	Day	5% 2 12% 37% 39% 5%	450
July	1st to 10th	Day	6% 1 12% 35% 40% 6%	446
	11th to 20th	Day	5% 6% 26% 52% 11%	444
	21st to end	Day	3 6% 35% 45% 11%	487
August	1st to 10th	Day	7% 2 10% 37% 38% 6%	447
	11th to 20th	Day	4 6% 37% 42% 11%	437
	21st to end	Day	3 1 8% 32% 47% 8%	495
September	1st to 10th	Day	6% 1 9% 29% 44% 12%	450
	11th to 20th	Day	5% 2 13% 34% 37% 8%	450
	21st to end	Day	3 4 12% 28% 44% 10%	450
October	1st to 10th	Day	3 4 14% 31% 39% 9%	450
	11th to 20th	Day	4 5% 12% 28% 35% 15%	450
	21st to end	Day	7% 3 12% 31% 35% 12%	495
November	1st to 10th	Day	6% 4 17% 27% 34% 11%	447
	11th to 20th	Day	7% 5% 13% 30% 32% 12%	270
	21st to end	Day	7% 4 18% 29% 34% 8%	230
December	1st to 10th	Day	14% 5% 22% 22% 29% 8%	180
	11th to 20th	Day	12% 8% 21% 23% 27% 9%	180
	21st to end	Day	14% 12% 22% 28% 18% 6%	198
January	1st to 10th	Night	17% 7% 13% 32% 25% 7%	760
	11th to 20th	Night	12% 5% 15% 30% 29% 9%	726
	21st to end	Night	16% 5% 11% 31% 31% 5%	792
February	1st to 10th	Night	15% 5% 16% 28% 28% 8%	720
	11th to 20th	Night	15% 8% 16% 31% 24% 6%	704
	21st to end	Night	15% 8% 18% 31% 24% 4	592
March	1st to 10th	Night	18% 8% 17% 29% 24% 5%	720
	11th to 20th	Night	16% 6% 14% 30% 27% 7%	720
	21st to end	Night	14% 8% 19% 30% 26% 4	792
April	1st to 10th	Night	13% 5% 18% 30% 29% 6%	720
	11th to 20th	Night	13% 9% 16% 28% 27% 7%	711
	21st to end	Night	9% 5% 17% 31% 28% 10%	720
May	1st to 10th	Night	9% 4 15% 31% 31% 9%	715
	11th to 20th	Night	15% 4 12% 23% 34% 13%	522
	21st to end	Night	15% 4 16% 28% 26% 12%	389
June	1st to 10th	Night	10% 2 12% 30% 34% 12%	360
	11th to 20th	Night	5% 2 17% 27% 41% 8%	360
	21st to end	Night	6% 1 8% 24% 44% 17%	360
July	1st to 10th	Night	4 2 11% 23% 43% 17%	390
	11th to 20th	Night	7% 8% 15% 41% 30%	522
	21st to end	Night	11% 9% 21% 40% 20%	591
August	1st to 10th	Night	12% 1 11% 22% 39% 14%	537
	11th to 20th	Night	6% 1 8% 23% 42% 20%	687
	21st to end	Night	8% 1 9% 19% 44% 21%	792
September	1st to 10th	Night	5% 1 5% 19% 49% 22%	720
	11th to 20th	Night	7% 1 8% 25% 43% 15%	720
	21st to end	Night	4 1 7% 21% 44% 23%	720
October	1st to 10th	Night	8% 2 6% 31% 37% 16%	720
	11th to 20th	Night	6% 3 11% 24% 38% 18%	720
	21st to end	Night	7% 3 9% 27% 34% 20%	792
November	1st to 10th	Night	10% 3 11% 30% 35% 12%	740
	11th to 20th	Night	10% 3 11% 28% 39% 8%	760
	21st to end	Night	8% 3 12% 37% 32% 8%	760
December	1st to 10th	Night	14% 5% 13% 36% 26% 6%	760
	11th to 20th	Night	17% 6% 17% 31% 25% 5%	760
	21st to end	Night	17% 8% 18% 32% 22% 4	836

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