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 2025-02-06.

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	14% 9% 4 8% 5% 4 4 4 6% 7% 36%	108296
	Night	15% 10% 4 8% 5% 4 4 3 5% 6% 36%	110076
Transparency	Day	46% 6% 11% 22% 13% 2	111937
	Night	47% 5% 10% 22% 15% 2	114576
Seeing	Day	17% 12% 27% 24% 15% 6%	15874
	Night	18% 10% 29% 28% 13% 1	25816

By Month

Percentage Cloud Cover SE (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	13% 16% 9% 14% 6% 4 4 3 4 5% 23%	3617
	11th to 20th	Day	12% 15% 8% 14% 7% 6% 6% 5% 4 4 19%	3620
	21st to end	Day	21% 17% 8% 12% 4 3 3 3 3 3 24%	4141
February	1st to 10th	Day	18% 13% 6% 9% 7% 5% 4 3 4 5% 25%	1941
	11th to 20th	Day	15% 11% 3 12% 6% 5% 4 3 4 6% 31%	1848
	21st to end	Day	17% 15% 5% 10% 4 3 3 3 5% 5% 31%	1570
March	1st to 10th	Day	21% 19% 4 7% 4 3 3 3 4 4 28%	3120
	11th to 20th	Day	13% 8% 3 7% 4 4 4 3 5% 7% 43%	3370
	21st to end	Day	16% 11% 5% 9% 5% 5% 5% 4 5% 6% 30%	3987
April	1st to 10th	Day	15% 11% 3 9% 5% 4 4 3 4 7% 34%	2280
	11th to 20th	Day	17% 10% 3 7% 4 4 4 3 6% 7% 36%	2254
	21st to end	Day	20% 8% 3 8% 5% 4 4 3 4 7% 35%	2446
May	1st to 10th	Day	18% 11% 4 7% 5% 5% 5% 4 6% 8% 28%	4082
	11th to 20th	Day	19% 6% 2 6% 5% 4 4 3 6% 8% 37%	4081
	21st to end	Day	9% 6% 3 7% 5% 5% 5% 5% 7% 10% 38%	4591
June	1st to 10th	Day	11% 6% 3 6% 5% 5% 6% 3 6% 9% 41%	2660
	11th to 20th	Day	9% 5% 2 6% 4 4 5% 5% 7% 8% 44%	2660
	21st to end	Day	9% 6% 2 6% 6% 5% 5% 4 6% 10% 41%	2660
July	1st to 10th	Day	13% 7% 2 7% 5% 5% 5% 5% 7% 10% 34%	4440
	11th to 20th	Day	6% 4 2 5% 4 4 5% 5% 8% 12% 45%	4440
	21st to end	Day	9% 7% 2 8% 5% 6% 6% 5% 7% 8% 37%	4688
August	1st to 10th	Day	8% 5% 2 5% 4 4 5% 4 8% 9% 46%	4104
	11th to 20th	Day	8% 5% 2 6% 4 4 5% 4 7% 11% 42%	3886
	21st to end	Day	7% 4 2 6% 4 4 4 3 6% 9% 50%	4180
September	1st to 10th	Day	11% 6% 2 7% 4 4 4 3 7% 7% 45%	2248
	11th to 20th	Day	9% 5% 2 5% 4 4 4 4 7% 8% 48%	2090
	21st to end	Day	14% 6% 2 5% 4 4 3 3 5% 6% 47%	2090
October	1st to 10th	Day	12% 6% 2 6% 4 4 4 3 5% 7% 48%	2090
	11th to 20th	Day	13% 7% 2 7% 4 3 4 4 5% 7% 43%	1934
	21st to end	Day	17% 9% 4 8% 4 4 5% 4 5% 6% 34%	1881
November	1st to 10th	Day	9% 8% 2 6% 4 4 3 3 5% 6% 50%	1762
	11th to 20th	Day	16% 12% 3 9% 4 4 4 3 5% 7% 34%	1800
	21st to end	Day	18% 11% 4 8% 6% 3 4 2 5% 6% 33%	1800
December	1st to 10th	Day	13% 12% 4 8% 4 3 3 3 4 5% 41%	2930
	11th to 20th	Day	16% 16% 5% 11% 5% 5% 4 3 5% 5% 24%	3023
	21st to end	Day	25% 19% 7% 10% 5% 5% 4 3 4 5% 13%	3982
January	1st to 10th	Night	16% 15% 8% 14% 6% 4 4 3 5% 5% 22%	6348
	11th to 20th	Night	13% 20% 8% 14% 7% 6% 6% 4 3 3 18%	6360
	21st to end	Night	20% 13% 6% 8% 5% 4 4 4 4 5% 27%	6814
February	1st to 10th	Night	19% 14% 4 9% 5% 5% 4 3 4 5% 27%	2346
	11th to 20th	Night	13% 13% 4 10% 5% 4 4 3 5% 7% 33%	2218
	21st to end	Night	19% 11% 4 11% 5% 3 4 3 4 5% 30%	1884
March	1st to 10th	Night	19% 14% 3 7% 4 3 3 2 4 5% 34%	3733
	11th to 20th	Night	12% 7% 2 6% 4 4 4 3 5% 7% 46%	3590
	21st to end	Night	17% 9% 4 8% 5% 3 4 3 5% 5% 37%	3672
April	1st to 10th	Night	14% 10% 3 6% 5% 4 4 4 6% 8% 38%	1900
	11th to 20th	Night	17% 8% 2 5% 4 4 4 3 5% 7% 40%	1875
	21st to end	Night	17% 9% 2 7% 5% 4 5% 4 6% 6% 35%	1731
May	1st to 10th	Night	18% 10% 3 8% 6% 5% 4 4 5% 8% 28%	2813
	11th to 20th	Night	19% 7% 3 6% 3 3 4 3 5% 8% 39%	2812
	21st to end	Night	9% 5% 2 6% 4 4 6% 4 6% 10% 43%	2964
June	1st to 10th	Night	8% 6% 2 7% 5% 4 3 4 5% 8% 48%	1520
	11th to 20th	Night	10% 6% 2 6% 3 4 4 3 5% 8% 47%	1520
	21st to end	Night	6% 4 3 7% 4 4 5% 5% 7% 11% 44%	1520
July	1st to 10th	Night	10% 4 2 6% 4 4 5% 4 5% 9% 47%	2530
	11th to 20th	Night	5% 4 1 4 3 3 4 4 7% 7% 56%	2530
	21st to end	Night	9% 7% 3 7% 5% 5% 4 4 6% 9% 41%	2871
August	1st to 10th	Night	11% 5% 1 6% 4 4 4 3 6% 9% 49%	2825
	11th to 20th	Night	7% 6% 3 7% 5% 4 5% 4 6% 9% 45%	2939
	21st to end	Night	5% 4 2 6% 4 4 4 3 6% 7% 54%	3476
September	1st to 10th	Night	12% 6% 2 5% 5% 3 4 3 5% 6% 49%	1911
	11th to 20th	Night	7% 4 2 4 3 4 4 4 5% 7% 56%	2090
	21st to end	Night	12% 6% 2 5% 3 4 3 3 5% 7% 49%	2090
October	1st to 10th	Night	9% 4 2 5% 4 4 3 3 6% 6% 54%	2090
	11th to 20th	Night	18% 6% 2 4 3 3 3 3 4 7% 46%	2239
	21st to end	Night	17% 7% 3 6% 4 4 4 3 5% 6% 40%	2717
November	1st to 10th	Night	12% 7% 2 6% 3 3 3 3 5% 6% 49%	2536
	11th to 20th	Night	14% 10% 3 7% 4 3 4 3 5% 7% 39%	2600
	21st to end	Night	18% 13% 4 8% 5% 4 4 3 4 6% 31%	2600
December	1st to 10th	Night	14% 10% 4 8% 6% 3 4 3 4 6% 39%	4250
	11th to 20th	Night	18% 15% 6% 10% 5% 4 4 3 4 5% 27%	5166
	21st to end	Night	26% 19% 6% 10% 5% 4 4 3 4 4 15%	6996

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	65% 3 6% 19% 6% 1	3618
	11th to 20th	Day	69% 4 9% 8% 8% 2	3620
	21st to end	Day	67% 2 8% 14% 6% 2	4141
February	1st to 10th	Day	62% 5% 9% 15% 10% 1	1941
	11th to 20th	Day	56% 4 9% 20% 9% 1	1858
	21st to end	Day	56% 5% 9% 20% 8% 2	1570
March	1st to 10th	Day	61% 4 6% 19% 9% 1	3120
	11th to 20th	Day	41% 5% 9% 30% 13% 1	3370
	21st to end	Day	53% 7% 13% 22% 5%	3987
April	1st to 10th	Day	50% 6% 11% 20% 13% 1	2280
	11th to 20th	Day	46% 6% 11% 23% 10% 3	2254
	21st to end	Day	50% 5% 10% 22% 11% 3	2446
May	1st to 10th	Day	52% 8% 12% 22% 6%	4120
	11th to 20th	Day	45% 8% 12% 25% 9%	4085
	21st to end	Day	38% 9% 12% 21% 19% 1	4604
June	1st to 10th	Day	40% 7% 12% 22% 16% 3	2660
	11th to 20th	Day	34% 7% 12% 24% 21% 2	2660
	21st to end	Day	38% 7% 14% 20% 17% 4	2660
July	1st to 10th	Day	44% 6% 12% 22% 15% 2	4371
	11th to 20th	Day	29% 8% 15% 28% 18% 1	4365
	21st to end	Day	41% 9% 14% 18% 15% 3	4540
August	1st to 10th	Day	31% 8% 16% 29% 15% 1	4091
	11th to 20th	Day	33% 8% 12% 32% 14%	3925
	21st to end	Day	29% 7% 12% 30% 17% 4	4179
September	1st to 10th	Day	37% 6% 10% 25% 18% 4	2248
	11th to 20th	Day	32% 7% 10% 25% 21% 4	2090
	21st to end	Day	36% 5% 10% 25% 22% 1	2090
October	1st to 10th	Day	24% 4 9% 32% 29% 2	3480
	11th to 20th	Day	34% 5% 9% 26% 25% 1	3189
	21st to end	Day	41% 4 10% 24% 21% 1	3081
November	1st to 10th	Day	35% 4 12% 27% 18% 3	1762
	11th to 20th	Day	50% 4 9% 20% 13% 3	1800
	21st to end	Day	53% 3 10% 22% 10% 1	1800
December	1st to 10th	Day	48% 3 10% 27% 12%	2930
	11th to 20th	Day	62% 5% 10% 18% 5%	3020
	21st to end	Day	73% 4 9% 10% 4	3982
January	1st to 10th	Night	65% 4 8% 16% 8%	6348
	11th to 20th	Night	71% 4 6% 9% 7% 2	6360
	21st to end	Night	60% 3 10% 17% 8% 1	6814
February	1st to 10th	Night	60% 4 11% 16% 8% 1	2346
	11th to 20th	Night	52% 4 10% 19% 13% 1	2219
	21st to end	Night	56% 4 11% 17% 10% 2	1884
March	1st to 10th	Night	52% 5% 8% 23% 10% 2	3733
	11th to 20th	Night	38% 7% 10% 25% 19% 2	3590
	21st to end	Night	48% 6% 11% 27% 7% 1	3672
April	1st to 10th	Night	43% 6% 12% 23% 14% 2	1900
	11th to 20th	Night	44% 5% 9% 21% 16% 5%	1875
	21st to end	Night	46% 7% 9% 20% 13% 4	1731
May	1st to 10th	Night	54% 8% 9% 21% 8% 1	2840
	11th to 20th	Night	43% 7% 13% 25% 11% 1	2813
	21st to end	Night	34% 8% 13% 25% 16% 3	2972
June	1st to 10th	Night	33% 7% 9% 27% 20% 3	1520
	11th to 20th	Night	34% 7% 10% 23% 21% 4	1520
	21st to end	Night	32% 9% 15% 24% 17% 4	1520
July	1st to 10th	Night	34% 7% 10% 27% 17% 5%	2490
	11th to 20th	Night	23% 7% 13% 32% 23% 2	2482
	21st to end	Night	38% 7% 14% 21% 15% 4	2780
August	1st to 10th	Night	32% 7% 14% 31% 15% 1	2814
	11th to 20th	Night	34% 7% 13% 27% 18% 1	2966
	21st to end	Night	28% 6% 13% 29% 22% 3	3476
September	1st to 10th	Night	34% 6% 11% 22% 21% 6%	1911
	11th to 20th	Night	28% 6% 9% 27% 26% 4	2090
	21st to end	Night	34% 6% 9% 24% 23% 4	2090
October	1st to 10th	Night	20% 4 7% 27% 39% 2	3480
	11th to 20th	Night	29% 3 9% 25% 33% 2	3723
	21st to end	Night	34% 4 8% 26% 25% 4	4467
November	1st to 10th	Night	37% 4 9% 26% 22% 3	2536
	11th to 20th	Night	45% 4 10% 22% 17% 3	2600
	21st to end	Night	56% 4 8% 23% 10%	2600
December	1st to 10th	Night	48% 3 11% 26% 11%	4250
	11th to 20th	Night	61% 3 10% 16% 9% 1	5168
	21st to end	Night	73% 4 9% 10% 4	6996

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	23% 21% 32% 20% 3	300
	11th to 20th	Day	22% 22% 37% 13% 5%	300
	21st to end	Day	28% 19% 32% 16% 4	330
February	1st to 10th	Day	27% 18% 34% 16% 5%	285
	11th to 20th	Day	22% 23% 33% 17% 6%	270
	21st to end	Day	27% 18% 39% 15% 1	225
March	1st to 10th	Day	24% 25% 33% 16% 2	270
	11th to 20th	Day	26% 19% 33% 15% 6% 1	389
	21st to end	Day	29% 17% 32% 16% 6% 1	506
April	1st to 10th	Day	16% 21% 35% 18% 8% 2	460
	11th to 20th	Day	21% 18% 28% 20% 11% 2	452
	21st to end	Day	24% 17% 33% 17% 7% 2	460
May	1st to 10th	Day	22% 13% 33% 19% 10% 2	463
	11th to 20th	Day	22% 8% 28% 23% 12% 7%	487
	21st to end	Day	11% 8% 29% 23% 19% 9%	592
June	1st to 10th	Day	11% 7% 31% 29% 16% 6%	680
	11th to 20th	Day	12% 6% 25% 34% 17% 6%	680
	21st to end	Day	12% 8% 29% 26% 18% 7%	680
July	1st to 10th	Day	13% 3 19% 27% 23% 15%	671
	11th to 20th	Day	7% 4 21% 35% 22% 11%	668
	21st to end	Day	10% 3 18% 33% 27% 10%	663
August	1st to 10th	Day	11% 3 16% 26% 29% 15%	486
	11th to 20th	Day	11% 4 21% 29% 24% 12%	479
	21st to end	Day	6% 3 15% 31% 31% 14%	539
September	1st to 10th	Day	12% 5% 16% 30% 28% 9%	490
	11th to 20th	Day	10% 3 14% 29% 29% 15%	490
	21st to end	Day	17% 8% 23% 21% 20% 10%	490
October	1st to 10th	Day	11% 9% 21% 35% 16% 8%	490
	11th to 20th	Day	13% 18% 32% 23% 11% 2	419
	21st to end	Day	25% 17% 35% 20% 3	330
November	1st to 10th	Day	12% 19% 32% 21% 14% 2	300
	11th to 20th	Day	23% 19% 32% 17% 7% 2	300
	21st to end	Day	25% 14% 38% 20% 4	300
December	1st to 10th	Day	19% 25% 36% 15% 4 1	300
	11th to 20th	Day	21% 21% 36% 16% 6%	300
	21st to end	Day	28% 21% 31% 16% 4	330
January	1st to 10th	Night	24% 17% 33% 23% 4	1000
	11th to 20th	Night	26% 15% 37% 19% 3	1000
	21st to end	Night	24% 16% 34% 24% 3	1022
February	1st to 10th	Night	27% 12% 34% 25% 2	781
	11th to 20th	Night	20% 17% 36% 24% 3	743
	21st to end	Night	26% 12% 39% 21% 3	628
March	1st to 10th	Night	21% 15% 34% 24% 6%	760
	11th to 20th	Night	19% 15% 38% 22% 6% 1	760
	21st to end	Night	25% 12% 31% 27% 5% 1	755
April	1st to 10th	Night	18% 14% 35% 25% 7%	570
	11th to 20th	Night	20% 11% 31% 28% 9% 1	563
	21st to end	Night	21% 10% 39% 22% 7% 1	570
May	1st to 10th	Night	19% 10% 35% 25% 10%	570
	11th to 20th	Night	20% 5% 26% 30% 18% 1	561
	21st to end	Night	9% 4 27% 36% 22% 2	617
June	1st to 10th	Night	11% 3 27% 44% 15% 1	570
	11th to 20th	Night	12% 4 21% 42% 20% 1	570
	21st to end	Night	7% 4 26% 38% 25% 1	570
July	1st to 10th	Night	10% 2 15% 37% 31% 6%	555
	11th to 20th	Night	7% 3 19% 38% 29% 4	552
	21st to end	Night	8% 2 18% 40% 30% 2	624
August	1st to 10th	Night	8% 1 16% 38% 33% 4	567
	11th to 20th	Night	7% 2 13% 41% 30% 5%	564
	21st to end	Night	8% 1 16% 32% 38% 5%	627
September	1st to 10th	Night	13% 4 14% 34% 30% 4	581
	11th to 20th	Night	8% 3 17% 34% 35% 4	760
	21st to end	Night	15% 5% 21% 32% 25% 2	760
October	1st to 10th	Night	11% 6% 23% 35% 20% 5%	760
	11th to 20th	Night	21% 10% 29% 26% 13% 1	760
	21st to end	Night	22% 11% 36% 25% 7% 1	836
November	1st to 10th	Night	18% 9% 34% 27% 12% 1	780
	11th to 20th	Night	18% 16% 32% 26% 7% 1	800
	21st to end	Night	26% 13% 29% 25% 7%	800
December	1st to 10th	Night	23% 14% 37% 21% 5%	800
	11th to 20th	Night	26% 12% 32% 23% 7%	980
	21st to end	Night	31% 14% 31% 20% 4	1100

Page generated at 2025-02-03 03:05:53. Version ac07

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