Newfound Lake
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Newfound Lake 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	17% 8% 3 7% 5% 5% 5% 4 6% 7% 34%	101395
	Night	17% 8% 3 7% 5% 4 4 4 6% 7% 35%	97755
Transparency	Day	46% 7% 12% 21% 12% 1	104907
	Night	45% 7% 13% 21% 12% 1	102332
Seeing	Day	24% 17% 28% 19% 9% 3	14887
	Night	22% 16% 25% 27% 9% 1	23774

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	14% 8% 4 8% 5% 4 5% 5% 6% 8% 35%	2517
	11th to 20th	Day	15% 11% 3 9% 7% 6% 6% 4 7% 6% 25%	2520
	21st to end	Day	16% 12% 4 10% 7% 4 4 4 6% 6% 28%	2772
February	1st to 10th	Day	15% 11% 3 9% 5% 5% 5% 4 5% 7% 31%	1684
	11th to 20th	Day	11% 10% 3 10% 7% 4 5% 4 5% 7% 34%	1848
	21st to end	Day	15% 11% 3 8% 5% 5% 5% 5% 6% 6% 32%	1570
March	1st to 10th	Day	20% 16% 3 8% 5% 5% 4 4 4 5% 28%	3116
	11th to 20th	Day	14% 9% 3 7% 5% 6% 6% 6% 6% 7% 30%	3303
	21st to end	Day	19% 10% 3 8% 5% 5% 4 3 4 7% 32%	4089
April	1st to 10th	Day	18% 11% 3 7% 5% 4 4 3 5% 7% 33%	2280
	11th to 20th	Day	17% 6% 2 7% 4 5% 5% 4 7% 7% 36%	2269
	21st to end	Day	21% 8% 3 8% 5% 5% 5% 4 5% 5% 32%	2470
May	1st to 10th	Day	23% 12% 4 9% 5% 4 4 3 5% 5% 26%	4106
	11th to 20th	Day	19% 8% 3 8% 5% 5% 5% 4 6% 8% 30%	4320
	21st to end	Day	14% 5% 2 5% 5% 5% 6% 5% 7% 9% 39%	4837
June	1st to 10th	Day	20% 6% 2 7% 6% 5% 6% 4 7% 9% 29%	2660
	11th to 20th	Day	16% 6% 2 6% 5% 5% 5% 4 6% 9% 36%	2660
	21st to end	Day	20% 7% 2 6% 6% 6% 5% 4 6% 7% 30%	2660
July	1st to 10th	Day	12% 6% 2 6% 5% 4 6% 5% 8% 10% 35%	4440
	11th to 20th	Day	10% 4 2 6% 5% 6% 7% 5% 7% 10% 36%	4440
	21st to end	Day	19% 6% 2 5% 4 5% 4 4 6% 7% 36%	4814
August	1st to 10th	Day	14% 6% 3 7% 6% 6% 5% 5% 8% 7% 34%	4275
	11th to 20th	Day	16% 8% 3 7% 5% 5% 5% 5% 7% 9% 31%	3996
	21st to end	Day	9% 4 2 6% 4 5% 5% 4 7% 11% 42%	4180
September	1st to 10th	Day	12% 4 2 5% 4 4 4 4 7% 9% 45%	2280
	11th to 20th	Day	14% 5% 1 5% 3 4 4 3 4 6% 52%	2114
	21st to end	Day	15% 6% 2 5% 4 4 4 4 5% 7% 44%	2090
October	1st to 10th	Day	22% 7% 3 7% 4 5% 4 4 4 6% 35%	2090
	11th to 20th	Day	15% 7% 2 7% 5% 5% 4 3 5% 6% 40%	1810
	21st to end	Day	24% 9% 2 6% 5% 5% 4 3 5% 5% 32%	1881
November	1st to 10th	Day	13% 7% 3 6% 4 5% 4 3 5% 8% 41%	1752
	11th to 20th	Day	19% 6% 2 7% 4 4 5% 5% 6% 6% 37%	1710
	21st to end	Day	20% 8% 1 6% 4 5% 4 4 7% 7% 33%	1644
December	1st to 10th	Day	20% 10% 3 8% 6% 6% 5% 5% 6% 6% 26%	1520
	11th to 20th	Day	22% 9% 2 5% 4 4 5% 4 4 6% 35%	1906
	21st to end	Day	24% 11% 3 6% 5% 5% 4 4 5% 6% 26%	2772
January	1st to 10th	Night	16% 9% 3 7% 4 4 4 4 6% 7% 37%	4429
	11th to 20th	Night	12% 9% 4 12% 8% 5% 6% 5% 7% 6% 27%	4440
	21st to end	Night	18% 12% 4 10% 5% 5% 5% 4 5% 6% 27%	4884
February	1st to 10th	Night	15% 9% 2 8% 5% 5% 5% 5% 6% 7% 32%	2493
	11th to 20th	Night	11% 8% 3 7% 5% 5% 5% 6% 7% 9% 34%	2218
	21st to end	Night	14% 9% 2 7% 5% 5% 5% 5% 6% 8% 35%	1884
March	1st to 10th	Night	23% 14% 2 6% 5% 4 4 3 5% 6% 29%	3724
	11th to 20th	Night	13% 10% 4 9% 6% 6% 5% 4 6% 6% 31%	3654
	21st to end	Night	21% 10% 3 7% 4 4 3 4 6% 6% 32%	3540
April	1st to 10th	Night	19% 9% 3 7% 5% 4 4 3 5% 5% 36%	1900
	11th to 20th	Night	20% 8% 3 6% 5% 4 4 2 5% 7% 36%	1858
	21st to end	Night	21% 7% 2 6% 4 4 4 3 5% 8% 36%	1710
May	1st to 10th	Night	29% 10% 3 7% 5% 4 4 4 5% 6% 24%	2834
	11th to 20th	Night	18% 11% 4 8% 5% 6% 6% 5% 6% 6% 27%	2601
	21st to end	Night	15% 6% 1 6% 5% 4 4 4 6% 9% 40%	2738
June	1st to 10th	Night	21% 6% 2 8% 4 4 4 4 5% 7% 34%	1520
	11th to 20th	Night	19% 6% 1 5% 5% 4 4 4 6% 7% 38%	1520
	21st to end	Night	19% 6% 2 6% 5% 4 5% 5% 6% 7% 35%	1520
July	1st to 10th	Night	11% 5% 2 5% 6% 4 6% 5% 8% 9% 38%	2520
	11th to 20th	Night	14% 6% 2 5% 4 4 5% 3 5% 7% 44%	2520
	21st to end	Night	18% 6% 2 5% 4 4 4 4 6% 7% 41%	2739
August	1st to 10th	Night	21% 7% 3 7% 4 4 4 3 5% 6% 36%	2623
	11th to 20th	Night	16% 8% 3 6% 4 5% 4 4 6% 7% 38%	2814
	21st to end	Night	10% 4 1 4 4 4 4 4 8% 10% 46%	3476
September	1st to 10th	Night	12% 5% 2 5% 4 3 3 4 5% 6% 51%	1900
	11th to 20th	Night	14% 5% 2 5% 3 3 4 3 5% 7% 50%	2066
	21st to end	Night	16% 6% 1 6% 3 4 3 4 6% 7% 44%	2090
October	1st to 10th	Night	21% 7% 2 7% 4 4 4 4 5% 5% 38%	2090
	11th to 20th	Night	16% 7% 3 6% 4 5% 5% 4 6% 6% 38%	2366
	21st to end	Night	24% 8% 2 6% 4 4 4 4 5% 6% 33%	2717
November	1st to 10th	Night	14% 7% 2 6% 5% 5% 5% 4 5% 7% 41%	2531
	11th to 20th	Night	16% 7% 2 6% 5% 4 4 4 6% 7% 38%	2470
	21st to end	Night	16% 8% 3 7% 5% 5% 4 3 7% 7% 36%	2534
December	1st to 10th	Night	19% 10% 3 8% 6% 5% 4 4 5% 7% 28%	2660
	11th to 20th	Night	20% 9% 3 6% 4 3 5% 4 7% 7% 32%	3288
	21st to end	Night	22% 12% 4 9% 5% 4 4 3 5% 6% 27%	4884

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	44% 7% 12% 28% 8% 1	2518
	11th to 20th	Day	53% 10% 12% 18% 6% 1	2520
	21st to end	Day	54% 7% 11% 18% 8% 1	2772
February	1st to 10th	Day	50% 6% 12% 20% 9% 2	1684
	11th to 20th	Day	48% 8% 10% 20% 12% 3	1857
	21st to end	Day	51% 6% 11% 19% 12% 2	1570
March	1st to 10th	Day	59% 6% 10% 13% 11% 2	3119
	11th to 20th	Day	47% 9% 13% 16% 12% 4	3303
	21st to end	Day	51% 5% 6% 16% 18% 4	4089
April	1st to 10th	Day	50% 5% 9% 19% 13% 3	2280
	11th to 20th	Day	44% 7% 12% 20% 16% 1	2269
	21st to end	Day	53% 6% 9% 17% 13% 3	2470
May	1st to 10th	Day	58% 8% 9% 18% 7% 1	4120
	11th to 20th	Day	50% 9% 15% 15% 9% 1	4324
	21st to end	Day	37% 10% 14% 24% 14% 1	4837
June	1st to 10th	Day	49% 8% 13% 19% 10%	2660
	11th to 20th	Day	44% 7% 12% 20% 14% 2	2660
	21st to end	Day	50% 9% 11% 17% 11% 1	2660
July	1st to 10th	Day	40% 7% 15% 23% 14% 1	4370
	11th to 20th	Day	39% 8% 16% 27% 10%	4365
	21st to end	Day	45% 6% 13% 21% 14% 1	4661
August	1st to 10th	Day	44% 8% 15% 21% 10%	4261
	11th to 20th	Day	45% 9% 16% 23% 7%	4035
	21st to end	Day	33% 7% 16% 27% 16% 1	4180
September	1st to 10th	Day	34% 7% 14% 29% 16% 1	2280
	11th to 20th	Day	34% 6% 10% 29% 20% 2	2114
	21st to end	Day	38% 7% 13% 25% 16% 2	2090
October	1st to 10th	Day	46% 7% 9% 23% 15% 1	3480
	11th to 20th	Day	40% 5% 13% 24% 15% 2	2974
	21st to end	Day	39% 4 9% 29% 16% 3	3081
November	1st to 10th	Day	40% 6% 15% 24% 14% 1	1752
	11th to 20th	Day	43% 6% 12% 20% 16% 2	1710
	21st to end	Day	48% 6% 19% 18% 8% 1	1644
December	1st to 10th	Day	53% 8% 13% 16% 8% 1	1520
	11th to 20th	Day	49% 6% 11% 17% 16% 1	1906
	21st to end	Day	58% 6% 11% 15% 10%	2772
January	1st to 10th	Night	43% 8% 13% 24% 10% 2	4429
	11th to 20th	Night	49% 11% 13% 17% 9% 1	4440
	21st to end	Night	56% 6% 12% 16% 9% 1	4884
February	1st to 10th	Night	48% 8% 13% 19% 11% 2	2493
	11th to 20th	Night	43% 7% 12% 22% 14% 2	2220
	21st to end	Night	44% 8% 12% 21% 11% 4	1884
March	1st to 10th	Night	55% 6% 11% 17% 10% 2	3734
	11th to 20th	Night	49% 9% 10% 17% 13% 2	3655
	21st to end	Night	51% 5% 7% 14% 18% 5%	3540
April	1st to 10th	Night	49% 6% 10% 19% 15% 2	1900
	11th to 20th	Night	47% 6% 10% 23% 15% 1	1858
	21st to end	Night	46% 5% 13% 17% 16% 3	1710
May	1st to 10th	Night	58% 8% 10% 15% 8% 1	2840
	11th to 20th	Night	53% 10% 12% 15% 9% 2	2602
	21st to end	Night	40% 7% 17% 21% 13% 2	2739
June	1st to 10th	Night	48% 8% 13% 19% 11%	1520
	11th to 20th	Night	44% 8% 15% 19% 12% 2	1520
	21st to end	Night	46% 8% 15% 20% 10% 1	1520
July	1st to 10th	Night	38% 9% 17% 23% 13%	2480
	11th to 20th	Night	39% 7% 15% 26% 14%	2472
	21st to end	Night	41% 6% 12% 28% 13% 1	2651
August	1st to 10th	Night	49% 7% 12% 22% 9%	2613
	11th to 20th	Night	44% 8% 18% 20% 10%	2841
	21st to end	Night	29% 8% 19% 29% 15% 1	3476
September	1st to 10th	Night	32% 7% 14% 29% 17%	1900
	11th to 20th	Night	33% 6% 12% 28% 19% 1	2066
	21st to end	Night	38% 6% 12% 28% 15% 1	2090
October	1st to 10th	Night	43% 7% 14% 24% 11% 1	3480
	11th to 20th	Night	35% 6% 14% 24% 19% 3	3941
	21st to end	Night	40% 5% 12% 28% 13% 1	4467
November	1st to 10th	Night	40% 6% 13% 24% 14% 2	2531
	11th to 20th	Night	42% 6% 12% 23% 15% 2	2470
	21st to end	Night	44% 7% 16% 23% 9% 1	2534
December	1st to 10th	Night	53% 8% 11% 21% 7%	2660
	11th to 20th	Night	48% 7% 13% 16% 14% 1	3288
	21st to end	Night	57% 6% 10% 20% 7%	4884

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	29% 21% 31% 16% 3 1	180
	11th to 20th	Day	29% 28% 31% 8% 2 2	180
	21st to end	Day	20% 26% 31% 17% 6%	198
February	1st to 10th	Day	29% 27% 30% 11% 3	290
	11th to 20th	Day	28% 27% 30% 12% 3	456
	21st to end	Day	31% 24% 25% 16% 3	382
March	1st to 10th	Day	30% 21% 30% 15% 4	460
	11th to 20th	Day	32% 25% 26% 13% 4 1	460
	21st to end	Day	31% 22% 24% 15% 6% 2	506
April	1st to 10th	Day	34% 20% 26% 13% 6% 2	460
	11th to 20th	Day	31% 25% 23% 14% 6% 2	452
	21st to end	Day	32% 21% 28% 12% 5% 3	460
May	1st to 10th	Day	32% 21% 26% 14% 4 3	463
	11th to 20th	Day	23% 18% 33% 18% 6% 2	487
	21st to end	Day	21% 15% 31% 22% 9% 2	529
June	1st to 10th	Day	20% 14% 36% 18% 11% 1	490
	11th to 20th	Day	20% 15% 33% 19% 11% 3	490
	21st to end	Day	22% 14% 31% 19% 11% 2	490
July	1st to 10th	Day	19% 12% 31% 22% 13% 4	485
	11th to 20th	Day	14% 8% 33% 30% 12% 2	484
	21st to end	Day	15% 11% 36% 25% 11% 3	532
August	1st to 10th	Day	13% 13% 31% 25% 15% 3	486
	11th to 20th	Day	18% 12% 28% 22% 14% 6%	479
	21st to end	Day	13% 13% 27% 26% 15% 6%	539
September	1st to 10th	Day	17% 11% 28% 22% 17% 6%	490
	11th to 20th	Day	17% 13% 25% 21% 14% 10%	490
	21st to end	Day	16% 18% 25% 25% 10% 7%	490
October	1st to 10th	Day	28% 14% 21% 21% 12% 4	490
	11th to 20th	Day	24% 19% 22% 21% 11% 2	436
	21st to end	Day	35% 14% 23% 21% 6%	429
November	1st to 10th	Day	24% 17% 25% 23% 10% 1	392
	11th to 20th	Day	31% 18% 25% 19% 7% 1	370
	21st to end	Day	34% 18% 26% 16% 6% 1	304
December	1st to 10th	Day	28% 27% 24% 17% 4	180
	11th to 20th	Day	36% 22% 28% 12% 2	180
	21st to end	Day	32% 20% 30% 14% 4 1	198
January	1st to 10th	Night	22% 21% 30% 25% 3	760
	11th to 20th	Night	27% 20% 25% 25% 3	760
	21st to end	Night	19% 24% 31% 22% 4	836
February	1st to 10th	Night	22% 22% 32% 22% 2	760
	11th to 20th	Night	21% 24% 33% 19% 3	743
	21st to end	Night	24% 19% 28% 25% 4	628
March	1st to 10th	Night	28% 16% 30% 22% 3	760
	11th to 20th	Night	24% 21% 26% 22% 6%	760
	21st to end	Night	26% 19% 25% 22% 7% 1	836
April	1st to 10th	Night	27% 18% 28% 23% 4	760
	11th to 20th	Night	25% 19% 27% 22% 7%	734
	21st to end	Night	28% 18% 26% 23% 5%	570
May	1st to 10th	Night	28% 13% 26% 25% 7% 1	570
	11th to 20th	Night	21% 14% 26% 32% 8%	441
	21st to end	Night	19% 9% 23% 36% 11% 1	411
June	1st to 10th	Night	22% 8% 24% 34% 12% 1	380
	11th to 20th	Night	20% 9% 26% 31% 13%	380
	21st to end	Night	22% 5% 24% 37% 11% 1	380
July	1st to 10th	Night	15% 6% 21% 42% 16% 1	370
	11th to 20th	Night	15% 3 22% 38% 20% 2	368
	21st to end	Night	17% 3 21% 40% 18%	416
August	1st to 10th	Night	16% 4 19% 43% 18% 1	443
	11th to 20th	Night	16% 7% 27% 29% 17% 3	581
	21st to end	Night	16% 6% 19% 33% 23% 3	836
September	1st to 10th	Night	14% 8% 25% 32% 20% 1	760
	11th to 20th	Night	16% 11% 19% 30% 20% 5%	760
	21st to end	Night	19% 10% 22% 31% 17% 2	760
October	1st to 10th	Night	23% 12% 18% 30% 15% 2	760
	11th to 20th	Night	21% 15% 24% 26% 12% 1	760
	21st to end	Night	29% 16% 23% 26% 7%	836
November	1st to 10th	Night	19% 16% 27% 28% 9% 1	779
	11th to 20th	Night	23% 19% 25% 24% 8% 1	760
	21st to end	Night	24% 19% 25% 26% 6% 1	760
December	1st to 10th	Night	26% 21% 28% 21% 4	760
	11th to 20th	Night	28% 20% 27% 21% 4	760
	21st to end	Night	29% 23% 25% 22% 2	836

Page generated at 2024-11-07 06:55:45. Version ac07

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