Camden
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Camden clear sky chart from 2005-11-06 to 2024-11-08.

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	18% 8% 2 6% 4 4 4 4 5% 7% 38%	101094
	Night	18% 8% 3 6% 4 4 4 3 5% 6% 37%	98001
Transparency	Day	45% 6% 12% 22% 14% 2	104635
	Night	46% 5% 11% 21% 14% 2	102538
Seeing	Day	22% 15% 32% 22% 8% 2	15623
	Night	22% 13% 31% 25% 8% 1	24062

By Month

Percentage Cloud Cover NE (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	17% 8% 2 6% 5% 4 3 3 4 5% 42%	2517
	11th to 20th	Day	17% 8% 2 5% 3 3 4 3 4 7% 44%	2520
	21st to end	Day	17% 11% 3 8% 4 3 3 3 4 6% 38%	2813
February	1st to 10th	Day	17% 10% 2 7% 5% 4 5% 3 5% 5% 37%	1710
	11th to 20th	Day	14% 10% 2 7% 5% 4 5% 4 6% 5% 39%	1787
	21st to end	Day	15% 10% 3 8% 5% 3 4 4 6% 6% 37%	1570
March	1st to 10th	Day	25% 13% 2 6% 4 4 4 3 4 5% 30%	3131
	11th to 20th	Day	18% 9% 2 7% 5% 4 5% 3 5% 5% 37%	3480
	21st to end	Day	25% 10% 3 5% 4 4 4 3 5% 6% 30%	3816
April	1st to 10th	Day	20% 12% 3 6% 4 4 4 3 4 6% 34%	2270
	11th to 20th	Day	19% 8% 2 6% 5% 4 4 3 5% 7% 38%	2400
	21st to end	Day	22% 8% 3 7% 5% 3 4 4 4 7% 34%	2470
May	1st to 10th	Day	21% 9% 3 6% 4 4 5% 4 5% 7% 31%	4106
	11th to 20th	Day	19% 8% 2 7% 4 4 5% 4 6% 6% 36%	4081
	21st to end	Day	17% 8% 2 5% 4 4 4 4 7% 8% 37%	4816
June	1st to 10th	Day	22% 8% 2 7% 4 4 4 4 5% 7% 32%	2850
	11th to 20th	Day	18% 7% 2 6% 4 4 4 3 6% 7% 38%	2850
	21st to end	Day	25% 7% 3 6% 4 5% 5% 4 6% 7% 29%	2844
July	1st to 10th	Day	15% 7% 3 6% 5% 5% 5% 4 7% 8% 36%	4440
	11th to 20th	Day	15% 6% 2 5% 3 4 4 4 6% 9% 40%	4440
	21st to end	Day	22% 6% 2 5% 4 4 4 4 5% 7% 36%	4737
August	1st to 10th	Day	18% 8% 2 7% 4 4 5% 4 6% 8% 33%	4105
	11th to 20th	Day	17% 8% 3 7% 5% 5% 4 4 5% 7% 35%	4045
	21st to end	Day	10% 5% 2 5% 3 4 5% 5% 6% 9% 46%	4473
September	1st to 10th	Day	10% 6% 2 5% 4 4 5% 3 5% 7% 49%	2195
	11th to 20th	Day	12% 5% 1 5% 3 3 3 2 5% 6% 54%	2090
	21st to end	Day	18% 7% 2 4 4 4 3 3 5% 7% 44%	2090
October	1st to 10th	Day	16% 7% 3 6% 5% 4 5% 3 4 6% 41%	2052
	11th to 20th	Day	19% 5% 2 5% 4 4 4 3 4 6% 43%	1877
	21st to end	Day	22% 9% 2 5% 4 3 4 3 4 6% 39%	1881
November	1st to 10th	Day	16% 7% 2 6% 4 4 4 2 5% 6% 43%	1734
	11th to 20th	Day	21% 5% 2 5% 3 3 4 4 4 6% 43%	1710
	21st to end	Day	20% 9% 2 5% 3 3 3 3 3 6% 43%	1541
December	1st to 10th	Day	21% 10% 2 6% 5% 4 4 3 4 5% 36%	1421
	11th to 20th	Day	23% 9% 2 4 4 4 3 2 4 4 40%	1668
	21st to end	Day	26% 10% 2 5% 4 4 4 3 5% 5% 31%	2564
January	1st to 10th	Night	15% 9% 3 7% 5% 3 4 3 5% 6% 42%	4429
	11th to 20th	Night	13% 10% 3 9% 5% 4 4 3 5% 6% 38%	4440
	21st to end	Night	16% 13% 4 8% 4 4 4 3 4 5% 35%	4842
February	1st to 10th	Night	16% 10% 3 6% 5% 6% 5% 4 4 6% 35%	2470
	11th to 20th	Night	14% 9% 4 8% 4 4 4 3 5% 6% 39%	2274
	21st to end	Night	14% 10% 4 6% 5% 4 4 3 4 6% 41%	1884
March	1st to 10th	Night	28% 13% 3 5% 4 4 3 3 3 4 32%	3707
	11th to 20th	Night	14% 9% 3 8% 6% 5% 6% 4 6% 7% 33%	3479
	21st to end	Night	26% 9% 3 7% 4 4 4 4 5% 4 30%	3816
April	1st to 10th	Night	23% 10% 3 5% 4 4 4 3 4 6% 34%	1905
	11th to 20th	Night	19% 8% 2 5% 5% 4 4 3 6% 9% 35%	1727
	21st to end	Night	23% 9% 3 6% 3 4 4 3 4 6% 35%	1710
May	1st to 10th	Night	24% 8% 3 6% 3 3 4 4 5% 8% 33%	2834
	11th to 20th	Night	18% 7% 3 8% 5% 6% 5% 5% 7% 8% 28%	2813
	21st to end	Night	16% 7% 3 8% 5% 4 5% 4 5% 7% 35%	2783
June	1st to 10th	Night	22% 8% 3 6% 4 4 5% 4 6% 7% 30%	1330
	11th to 20th	Night	16% 8% 2 7% 4 3 4 5% 5% 7% 37%	1330
	21st to end	Night	24% 9% 3 7% 4 4 4 4 5% 7% 29%	1330
July	1st to 10th	Night	15% 8% 2 6% 5% 5% 6% 5% 7% 9% 32%	2519
	11th to 20th	Night	17% 6% 2 5% 4 5% 5% 4 6% 8% 38%	2520
	21st to end	Night	15% 8% 2 5% 4 4 4 4 6% 8% 39%	2770
August	1st to 10th	Night	22% 8% 3 7% 5% 5% 5% 3 5% 7% 30%	2825
	11th to 20th	Night	17% 11% 3 7% 5% 4 5% 3 5% 7% 33%	2782
	21st to end	Night	10% 5% 2 5% 4 4 4 4 5% 7% 49%	3180
September	1st to 10th	Night	12% 6% 2 5% 3 3 4 4 5% 7% 49%	1985
	11th to 20th	Night	15% 7% 1 4 2 2 3 2 4 7% 52%	2090
	21st to end	Night	17% 6% 2 5% 3 4 4 3 4 6% 46%	2090
October	1st to 10th	Night	18% 6% 3 6% 4 5% 4 3 4 7% 41%	2127
	11th to 20th	Night	17% 5% 2 6% 3 3 4 3 5% 6% 44%	2299
	21st to end	Night	24% 8% 2 5% 4 4 3 2 4 6% 38%	2717
November	1st to 10th	Night	17% 6% 2 6% 4 3 3 4 4 6% 44%	2505
	11th to 20th	Night	18% 6% 2 5% 4 4 4 3 4 6% 43%	2470
	21st to end	Night	18% 7% 2 5% 4 3 4 3 5% 6% 42%	2636
December	1st to 10th	Night	22% 9% 3 6% 4 3 4 3 5% 6% 35%	2758
	11th to 20th	Night	22% 9% 2 4 4 3 3 3 4 5% 41%	3531
	21st to end	Night	24% 9% 2 6% 3 3 3 3 4 5% 36%	5094

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	45% 4 13% 26% 11% 1	2518
	11th to 20th	Day	43% 4 12% 26% 13% 2	2520
	21st to end	Day	48% 4 13% 21% 13% 1	2813
February	1st to 10th	Day	49% 4 11% 19% 15% 3	1710
	11th to 20th	Day	46% 5% 11% 20% 16% 3	1796
	21st to end	Day	48% 5% 10% 21% 12% 5%	1570
March	1st to 10th	Day	57% 5% 9% 13% 14% 3	3134
	11th to 20th	Day	46% 5% 13% 20% 14% 3	3480
	21st to end	Day	53% 3 8% 14% 17% 5%	3816
April	1st to 10th	Day	51% 4 9% 17% 15% 4	2270
	11th to 20th	Day	45% 5% 10% 23% 16% 2	2400
	21st to end	Day	50% 5% 8% 18% 15% 4	2470
May	1st to 10th	Day	48% 10% 13% 18% 9% 1	4120
	11th to 20th	Day	47% 8% 14% 22% 9% 1	4085
	21st to end	Day	43% 8% 15% 20% 13% 1	4816
June	1st to 10th	Day	50% 7% 12% 21% 9% 1	2850
	11th to 20th	Day	44% 7% 11% 20% 16% 2	2850
	21st to end	Day	53% 8% 9% 18% 10% 1	2844
July	1st to 10th	Day	45% 7% 12% 24% 12%	4370
	11th to 20th	Day	38% 8% 17% 26% 11% 1	4365
	21st to end	Day	47% 6% 12% 23% 12% 1	4586
August	1st to 10th	Day	46% 8% 14% 25% 7%	4092
	11th to 20th	Day	45% 8% 17% 21% 9%	4084
	21st to end	Day	31% 8% 14% 27% 19% 1	4473
September	1st to 10th	Day	33% 7% 14% 27% 19% 1	2195
	11th to 20th	Day	32% 5% 12% 27% 21% 3	2090
	21st to end	Day	41% 5% 8% 27% 17% 1	2090
October	1st to 10th	Day	46% 8% 11% 22% 12% 1	3416
	11th to 20th	Day	32% 4 10% 31% 23%	3093
	21st to end	Day	35% 3 14% 24% 20% 4	3081
November	1st to 10th	Day	42% 4 13% 24% 16% 2	1734
	11th to 20th	Day	42% 4 10% 21% 20% 3	1710
	21st to end	Day	45% 4 16% 21% 13% 1	1541
December	1st to 10th	Day	51% 4 10% 22% 12% 1	1421
	11th to 20th	Day	48% 4 10% 20% 14% 4	1668
	21st to end	Day	54% 7% 11% 17% 9% 2	2564
January	1st to 10th	Night	44% 4 12% 28% 10% 2	4429
	11th to 20th	Night	48% 4 13% 21% 12% 2	4440
	21st to end	Night	52% 4 10% 20% 12% 1	4842
February	1st to 10th	Night	50% 4 11% 18% 13% 3	2470
	11th to 20th	Night	47% 4 9% 20% 17% 3	2276
	21st to end	Night	45% 4 10% 21% 15% 5%	1884
March	1st to 10th	Night	57% 3 9% 16% 11% 4	3717
	11th to 20th	Night	46% 6% 14% 19% 11% 2	3480
	21st to end	Night	56% 3 7% 14% 16% 4	3816
April	1st to 10th	Night	51% 4 8% 15% 18% 4	1905
	11th to 20th	Night	47% 5% 7% 23% 16% 1	1727
	21st to end	Night	51% 5% 10% 17% 15% 3	1710
May	1st to 10th	Night	49% 9% 16% 17% 8% 1	2840
	11th to 20th	Night	52% 8% 14% 17% 7% 2	2814
	21st to end	Night	47% 9% 13% 18% 12% 1	2784
June	1st to 10th	Night	52% 8% 9% 21% 8% 1	1330
	11th to 20th	Night	47% 6% 15% 19% 13% 2	1330
	21st to end	Night	55% 5% 9% 18% 10% 2	1330
July	1st to 10th	Night	47% 8% 13% 19% 12%	2479
	11th to 20th	Night	44% 7% 15% 24% 10%	2472
	21st to end	Night	42% 6% 14% 24% 12% 1	2681
August	1st to 10th	Night	55% 7% 12% 19% 7%	2813
	11th to 20th	Night	49% 8% 13% 19% 10%	2809
	21st to end	Night	32% 7% 13% 27% 20% 1	3180
September	1st to 10th	Night	35% 5% 12% 28% 18% 1	1985
	11th to 20th	Night	35% 4 11% 28% 21% 2	2090
	21st to end	Night	39% 5% 9% 29% 17% 2	2090
October	1st to 10th	Night	41% 5% 14% 24% 15% 1	3543
	11th to 20th	Night	31% 3 10% 29% 24% 2	3810
	21st to end	Night	38% 4 10% 28% 18% 3	4467
November	1st to 10th	Night	41% 5% 11% 25% 16% 1	2505
	11th to 20th	Night	43% 4 10% 23% 18% 2	2470
	21st to end	Night	44% 5% 13% 20% 16% 2	2636
December	1st to 10th	Night	52% 5% 9% 21% 13% 1	2758
	11th to 20th	Night	46% 4 11% 21% 18% 1	3532
	21st to end	Night	50% 6% 11% 18% 13% 1	5094

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	25% 22% 30% 18% 5%	180
	11th to 20th	Day	26% 26% 28% 16% 4 1	180
	21st to end	Day	19% 22% 35% 20% 4	226
February	1st to 10th	Day	26% 21% 33% 17% 3	370
	11th to 20th	Day	24% 26% 34% 14% 2	426
	21st to end	Day	23% 21% 35% 18% 3	382
March	1st to 10th	Day	24% 22% 36% 15% 2	460
	11th to 20th	Day	21% 24% 37% 15% 3 1	460
	21st to end	Day	27% 24% 29% 13% 6% 1	506
April	1st to 10th	Day	30% 22% 31% 13% 4 1	460
	11th to 20th	Day	25% 22% 31% 17% 4 1	452
	21st to end	Day	25% 17% 38% 13% 5% 1	460
May	1st to 10th	Day	26% 20% 32% 16% 4 1	463
	11th to 20th	Day	16% 16% 39% 22% 5% 1	487
	21st to end	Day	19% 15% 38% 21% 5% 1	538
June	1st to 10th	Day	22% 11% 31% 24% 10% 1	680
	11th to 20th	Day	19% 9% 34% 24% 12% 2	680
	21st to end	Day	27% 8% 28% 26% 10% 1	674
July	1st to 10th	Day	20% 8% 35% 27% 9% 2	485
	11th to 20th	Day	16% 6% 36% 29% 11% 3	484
	21st to end	Day	17% 5% 36% 29% 11% 2	532
August	1st to 10th	Day	15% 6% 31% 34% 13% 1	486
	11th to 20th	Day	19% 6% 27% 33% 12% 3	479
	21st to end	Day	15% 9% 31% 29% 12% 4	539
September	1st to 10th	Day	14% 8% 32% 29% 15% 2	490
	11th to 20th	Day	16% 9% 32% 22% 14% 6%	490
	21st to end	Day	17% 12% 32% 24% 10% 5%	490
October	1st to 10th	Day	19% 14% 26% 28% 10% 3	470
	11th to 20th	Day	21% 16% 31% 22% 8% 3	390
	21st to end	Day	30% 14% 31% 21% 5%	429
November	1st to 10th	Day	20% 19% 28% 24% 7% 2	386
	11th to 20th	Day	26% 18% 31% 20% 4 1	370
	21st to end	Day	25% 22% 29% 17% 6%	370
December	1st to 10th	Day	23% 17% 37% 17% 5% 1	271
	11th to 20th	Day	32% 25% 32% 9% 1 1	180
	21st to end	Day	28% 25% 30% 12% 5%	198
January	1st to 10th	Night	21% 22% 35% 20% 3	760
	11th to 20th	Night	26% 21% 34% 15% 4	760
	21st to end	Night	18% 21% 40% 17% 3	836
February	1st to 10th	Night	23% 20% 35% 19% 3	760
	11th to 20th	Night	20% 22% 38% 17% 3	743
	21st to end	Night	22% 16% 37% 21% 4	628
March	1st to 10th	Night	25% 18% 37% 19% 2	760
	11th to 20th	Night	21% 16% 35% 22% 6%	760
	21st to end	Night	24% 16% 33% 21% 6%	836
April	1st to 10th	Night	28% 14% 33% 20% 3 1	760
	11th to 20th	Night	23% 12% 33% 27% 5%	603
	21st to end	Night	29% 11% 31% 24% 5% 1	570
May	1st to 10th	Night	26% 8% 31% 28% 8% 1	570
	11th to 20th	Night	24% 6% 35% 28% 6% 1	562
	21st to end	Night	22% 7% 28% 34% 8% 1	456
June	1st to 10th	Night	26% 6% 24% 32% 10% 1	380
	11th to 20th	Night	18% 6% 26% 36% 14% 1	380
	21st to end	Night	26% 6% 25% 34% 9%	380
July	1st to 10th	Night	21% 4 20% 40% 15%	370
	11th to 20th	Night	20% 4 20% 39% 16% 1	368
	21st to end	Night	18% 3 22% 40% 16% 1	435
August	1st to 10th	Night	17% 4 23% 41% 15% 1	568
	11th to 20th	Night	17% 5% 22% 40% 15% 1	562
	21st to end	Night	15% 5% 23% 38% 18% 2	657
September	1st to 10th	Night	14% 5% 29% 34% 17% 1	760
	11th to 20th	Night	18% 7% 26% 28% 15% 5%	760
	21st to end	Night	18% 7% 29% 29% 15% 2	760
October	1st to 10th	Night	22% 8% 26% 28% 15% 1	760
	11th to 20th	Night	20% 12% 31% 24% 11% 2	760
	21st to end	Night	29% 13% 29% 23% 5%	836
November	1st to 10th	Night	23% 12% 31% 26% 6% 2	771
	11th to 20th	Night	21% 16% 33% 22% 7% 1	760
	21st to end	Night	21% 20% 33% 20% 6%	838
December	1st to 10th	Night	27% 15% 37% 15% 5%	850
	11th to 20th	Night	24% 22% 33% 18% 3	850
	21st to end	Night	27% 20% 33% 17% 3	893

Page generated at 2024-11-05 08:15:48. Version ac07

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