Hearts Content Scenic Area
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Hearts Content Scenic Area clear sky chart from 2005-11-06 to 2025-10-19.

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% 12% 5% 9% 5% 4 4 3 5% 6% 28%	126624
	Night	18% 13% 5% 10% 5% 4 4 3 4 5% 28%	123073
Transparency	Day	56% 5% 10% 18% 9% 1	130219
	Night	57% 5% 10% 17% 9% 1	127564
Seeing	Day	26% 16% 28% 18% 9% 3	15849
	Night	25% 15% 27% 23% 10% 1	25332

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	16% 21% 10% 26% 5% 3 3 2 2 3 9%	3712
	11th to 20th	Day	11% 23% 11% 22% 9% 6% 2 1 2 2 11%	4026
	21st to end	Day	20% 17% 8% 15% 8% 5% 4 2 3 4 13%	4466
February	1st to 10th	Day	17% 20% 6% 14% 8% 6% 4 2 2 4 17%	1800
	11th to 20th	Day	15% 16% 8% 16% 8% 4 4 3 4 5% 17%	1753
	21st to end	Day	19% 17% 4 12% 6% 4 3 2 5% 6% 21%	1602
March	1st to 10th	Day	18% 12% 8% 10% 5% 3 3 3 4 5% 29%	4932
	11th to 20th	Day	14% 15% 7% 9% 4 4 3 3 4 6% 32%	4980
	21st to end	Day	21% 13% 5% 10% 4 4 3 2 4 5% 28%	5465
April	1st to 10th	Day	18% 17% 4 7% 5% 4 3 2 5% 6% 28%	2355
	11th to 20th	Day	20% 14% 3 7% 3 4 5% 3 4 5% 32%	2382
	21st to end	Day	22% 12% 3 6% 4 3 4 3 4 5% 34%	2600
May	1st to 10th	Day	25% 10% 3 8% 5% 4 4 3 4 6% 27%	5888
	11th to 20th	Day	23% 11% 3 8% 5% 5% 5% 3 6% 7% 26%	6083
	21st to end	Day	21% 8% 2 6% 5% 4 6% 4 5% 7% 32%	6949
June	1st to 10th	Day	18% 8% 2 7% 6% 4 5% 4 6% 8% 33%	2800
	11th to 20th	Day	17% 7% 2 7% 6% 4 5% 5% 7% 8% 32%	2800
	21st to end	Day	17% 7% 3 5% 5% 5% 4 4 6% 9% 36%	2800
July	1st to 10th	Day	10% 7% 2 6% 5% 5% 6% 5% 7% 9% 38%	6360
	11th to 20th	Day	14% 7% 3 7% 5% 5% 5% 4 7% 9% 34%	6136
	21st to end	Day	13% 6% 2 6% 4 5% 5% 4 5% 7% 42%	6424
August	1st to 10th	Day	19% 7% 2 8% 5% 5% 5% 4 6% 8% 30%	4234
	11th to 20th	Day	15% 8% 3 7% 5% 6% 6% 6% 7% 9% 28%	4174
	21st to end	Day	14% 6% 2 6% 4 4 6% 5% 7% 9% 36%	4417
September	1st to 10th	Day	19% 8% 2 6% 3 4 4 3 5% 7% 39%	2400
	11th to 20th	Day	13% 6% 3 7% 4 4 5% 3 5% 8% 41%	2281
	21st to end	Day	21% 8% 3 8% 4 5% 4 3 6% 7% 31%	2155
October	1st to 10th	Day	18% 8% 3 7% 4 4 4 4 5% 8% 35%	2000
	11th to 20th	Day	21% 11% 3 8% 5% 4 4 3 5% 5% 31%	1980
	21st to end	Day	25% 13% 3 8% 5% 4 4 3 4 5% 25%	2090
November	1st to 10th	Day	14% 13% 4 8% 5% 4 4 3 5% 7% 33%	1834
	11th to 20th	Day	18% 19% 4 9% 5% 4 4 4 5% 5% 24%	1600
	21st to end	Day	22% 24% 6% 7% 4 4 3 4 4 6% 17%	1600
December	1st to 10th	Day	20% 26% 15% 16% 3 2 2 2 2 2 9%	2600
	11th to 20th	Day	21% 23% 7% 10% 6% 3 2 2 3 4 17%	2986
	21st to end	Day	25% 24% 7% 12% 5% 3 3 3 3 4 12%	3960
January	1st to 10th	Night	14% 19% 10% 28% 8% 4 2 2 2 3 9%	6229
	11th to 20th	Night	12% 18% 11% 22% 9% 5% 4 3 3 4 9%	5859
	21st to end	Night	20% 18% 8% 17% 7% 5% 5% 2 3 3 13%	6490
February	1st to 10th	Night	18% 19% 6% 12% 10% 5% 4 3 3 3 18%	2600
	11th to 20th	Night	16% 15% 7% 15% 8% 6% 5% 3 4 5% 17%	2533
	21st to end	Night	20% 14% 6% 15% 6% 4 4 3 3 4 21%	2021
March	1st to 10th	Night	20% 15% 6% 9% 8% 3 2 2 4 5% 26%	4908
	11th to 20th	Night	15% 14% 7% 6% 3 3 3 3 4 5% 36%	4979
	21st to end	Night	18% 14% 5% 9% 4 4 3 2 4 4 32%	5467
April	1st to 10th	Night	20% 15% 4 7% 4 4 4 3 5% 6% 28%	2045
	11th to 20th	Night	19% 11% 4 5% 5% 3 5% 3 4 6% 35%	1975
	21st to end	Night	16% 11% 3 7% 4 4 5% 4 5% 8% 34%	1810
May	1st to 10th	Night	29% 12% 3 6% 4 4 4 3 4 5% 27%	4053
	11th to 20th	Night	23% 12% 3 6% 4 3 4 3 4 5% 33%	3809
	21st to end	Night	22% 8% 2 6% 3 3 4 3 5% 8% 35%	3926
June	1st to 10th	Night	13% 6% 2 7% 5% 5% 5% 4 6% 8% 40%	1600
	11th to 20th	Night	14% 7% 3 6% 5% 4 4 4 6% 9% 39%	1600
	21st to end	Night	14% 7% 2 6% 3 4 4 3 6% 9% 42%	1600
July	1st to 10th	Night	15% 8% 2 6% 4 4 4 3 5% 8% 41%	3600
	11th to 20th	Night	13% 8% 2 6% 4 5% 4 4 6% 9% 39%	3820
	21st to end	Night	11% 5% 2 6% 4 4 5% 3 5% 8% 46%	4428
August	1st to 10th	Night	15% 9% 3 7% 4 4 5% 4 6% 7% 37%	2915
	11th to 20th	Night	19% 8% 2 5% 4 4 4 4 5% 6% 40%	2875
	21st to end	Night	11% 5% 2 5% 4 4 4 4 6% 8% 45%	3446
September	1st to 10th	Night	14% 8% 2 5% 4 4 4 4 4 7% 46%	2000
	11th to 20th	Night	11% 5% 2 5% 4 4 4 4 6% 7% 49%	2115
	21st to end	Night	21% 8% 2 7% 5% 4 5% 3 5% 6% 34%	2244
October	1st to 10th	Night	18% 6% 2 6% 4 4 4 3 5% 7% 42%	2400
	11th to 20th	Night	21% 9% 3 7% 4 3 4 3 6% 7% 33%	2377
	21st to end	Night	28% 10% 3 5% 4 4 4 3 4 5% 29%	2508
November	1st to 10th	Night	15% 13% 3 6% 4 4 3 3 6% 6% 37%	2457
	11th to 20th	Night	19% 19% 4 7% 5% 5% 4 4 4 5% 24%	2800
	21st to end	Night	20% 20% 5% 9% 5% 4 3 3 5% 5% 20%	2800
December	1st to 10th	Night	17% 24% 13% 13% 4 4 4 3 4 4 12%	4580
	11th to 20th	Night	23% 20% 9% 12% 5% 3 3 2 3 4 16%	5208
	21st to end	Night	22% 21% 8% 12% 6% 4 3 3 4 4 13%	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	82% 3 5% 7% 3	3713
	11th to 20th	Day	83% 3 5% 7% 2	4060
	21st to end	Day	78% 3 6% 9% 3	4466
February	1st to 10th	Day	74% 4 8% 10% 5%	1800
	11th to 20th	Day	70% 6% 7% 11% 6%	1762
	21st to end	Day	65% 5% 10% 13% 5% 2	1602
March	1st to 10th	Day	58% 5% 12% 19% 6%	4935
	11th to 20th	Day	53% 6% 15% 19% 6% 2	4980
	21st to end	Day	58% 5% 6% 19% 11% 1	5465
April	1st to 10th	Day	57% 5% 10% 16% 11% 1	2355
	11th to 20th	Day	54% 6% 9% 19% 11% 2	2382
	21st to end	Day	52% 6% 10% 18% 12% 2	2600
May	1st to 10th	Day	59% 5% 8% 17% 8% 3	5897
	11th to 20th	Day	55% 8% 10% 17% 9% 1	6087
	21st to end	Day	49% 8% 11% 19% 11% 2	6949
June	1st to 10th	Day	47% 8% 12% 19% 13% 1	2800
	11th to 20th	Day	47% 9% 13% 18% 11% 1	2800
	21st to end	Day	44% 7% 14% 23% 12% 1	2800
July	1st to 10th	Day	42% 4 12% 25% 15% 1	6290
	11th to 20th	Day	45% 5% 13% 22% 14%	6061
	21st to end	Day	41% 5% 11% 25% 17% 1	6240
August	1st to 10th	Day	51% 7% 12% 21% 8%	4221
	11th to 20th	Day	49% 8% 13% 23% 7% 1	4213
	21st to end	Day	42% 6% 13% 28% 10% 1	4417
September	1st to 10th	Day	45% 6% 10% 22% 15% 1	2400
	11th to 20th	Day	41% 7% 12% 25% 14% 1	2281
	21st to end	Day	52% 7% 10% 19% 11% 1	2155
October	1st to 10th	Day	41% 5% 12% 24% 17% 1	3260
	11th to 20th	Day	49% 5% 13% 17% 13% 4	3220
	21st to end	Day	48% 4 14% 23% 10% 1	3428
November	1st to 10th	Day	50% 7% 12% 16% 13% 2	1834
	11th to 20th	Day	60% 6% 12% 14% 7% 2	1600
	21st to end	Day	68% 6% 11% 11% 4 1	1600
December	1st to 10th	Day	84% 3 6% 6% 1	2600
	11th to 20th	Day	73% 4 8% 12% 3	2986
	21st to end	Day	78% 5% 8% 7% 2	3960
January	1st to 10th	Night	83% 3 5% 6% 2	6229
	11th to 20th	Night	81% 4 7% 6% 2	5900
	21st to end	Night	78% 3 7% 8% 4 1	6490
February	1st to 10th	Night	71% 5% 7% 12% 5%	2600
	11th to 20th	Night	70% 6% 7% 12% 4	2535
	21st to end	Night	67% 5% 8% 12% 8%	2021
March	1st to 10th	Night	62% 4 11% 17% 6%	4918
	11th to 20th	Night	49% 5% 16% 20% 7% 3	4980
	21st to end	Night	55% 5% 9% 15% 15% 1	5467
April	1st to 10th	Night	56% 6% 10% 16% 11% 1	2045
	11th to 20th	Night	50% 6% 12% 19% 12% 2	1975
	21st to end	Night	48% 7% 12% 20% 11% 2	1810
May	1st to 10th	Night	59% 5% 9% 14% 10% 3	4060
	11th to 20th	Night	53% 7% 11% 19% 10% 1	3810
	21st to end	Night	46% 8% 11% 20% 12% 3	3927
June	1st to 10th	Night	40% 8% 13% 23% 14% 2	1600
	11th to 20th	Night	42% 8% 13% 22% 13% 2	1600
	21st to end	Night	39% 8% 14% 23% 16%	1600
July	1st to 10th	Night	43% 4 10% 26% 15% 1	3560
	11th to 20th	Night	42% 4 16% 26% 12% 1	3772
	21st to end	Night	36% 5% 13% 21% 24%	4297
August	1st to 10th	Night	45% 7% 13% 24% 10% 1	2904
	11th to 20th	Night	44% 6% 13% 29% 8%	2902
	21st to end	Night	36% 6% 15% 32% 10% 1	3446
September	1st to 10th	Night	38% 7% 12% 25% 16% 3	2000
	11th to 20th	Night	32% 8% 13% 27% 19% 1	2115
	21st to end	Night	51% 6% 12% 17% 12% 1	2244
October	1st to 10th	Night	41% 6% 9% 23% 21% 1	3920
	11th to 20th	Night	45% 5% 13% 17% 14% 6%	3876
	21st to end	Night	43% 5% 15% 23% 14% 1	4120
November	1st to 10th	Night	46% 6% 13% 20% 12% 3	2457
	11th to 20th	Night	60% 7% 10% 14% 7% 3	2800
	21st to end	Night	65% 6% 11% 14% 4 1	2800
December	1st to 10th	Night	78% 5% 8% 8% 2	4580
	11th to 20th	Night	73% 4 8% 12% 3	5208
	21st to end	Night	75% 6% 7% 10% 2	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	34% 29% 27% 9% 2	225
	11th to 20th	Day	38% 29% 24% 6% 2 1	300
	21st to end	Day	35% 28% 29% 6% 1	330
February	1st to 10th	Day	36% 28% 29% 6%	300
	11th to 20th	Day	41% 29% 26% 4	300
	21st to end	Day	42% 23% 29% 7%	306
March	1st to 10th	Day	33% 23% 31% 10% 3	500
	11th to 20th	Day	32% 23% 32% 9% 3 1	500
	21st to end	Day	37% 20% 27% 11% 4 1	550
April	1st to 10th	Day	33% 24% 24% 14% 3 1	500
	11th to 20th	Day	32% 23% 25% 13% 7% 2	492
	21st to end	Day	31% 20% 30% 15% 3 1	500
May	1st to 10th	Day	32% 21% 26% 13% 6% 1	503
	11th to 20th	Day	27% 15% 26% 22% 7% 2	527
	21st to end	Day	20% 14% 28% 21% 13% 4	573
June	1st to 10th	Day	23% 13% 31% 23% 8% 2	530
	11th to 20th	Day	22% 12% 28% 25% 12% 2	530
	21st to end	Day	21% 12% 32% 23% 9% 2	530
July	1st to 10th	Day	15% 8% 27% 26% 19% 6%	525
	11th to 20th	Day	14% 9% 31% 24% 15% 7%	524
	21st to end	Day	14% 8% 31% 26% 16% 5%	576
August	1st to 10th	Day	14% 7% 26% 26% 19% 7%	526
	11th to 20th	Day	18% 6% 25% 29% 13% 9%	519
	21st to end	Day	16% 8% 27% 27% 14% 7%	583
September	1st to 10th	Day	22% 12% 20% 23% 16% 8%	530
	11th to 20th	Day	14% 5% 23% 26% 24% 9%	530
	21st to end	Day	27% 10% 27% 19% 14% 4	530
October	1st to 10th	Day	22% 12% 28% 20% 14% 4	530
	11th to 20th	Day	28% 17% 32% 15% 6% 2	522
	21st to end	Day	34% 19% 28% 15% 4	539
November	1st to 10th	Day	25% 20% 30% 16% 7% 2	399
	11th to 20th	Day	34% 22% 31% 10% 4 1	200
	21st to end	Day	35% 26% 32% 7% 1	200
December	1st to 10th	Day	40% 26% 25% 7% 3 2	200
	11th to 20th	Day	42% 21% 29% 9% 1	200
	21st to end	Day	38% 24% 30% 7% 2	220
January	1st to 10th	Night	32% 23% 33% 10% 3	800
	11th to 20th	Night	33% 23% 30% 13% 2	800
	21st to end	Night	28% 26% 30% 14% 2	880
February	1st to 10th	Night	33% 22% 30% 15% 1	800
	11th to 20th	Night	31% 25% 33% 11% 1	783
	21st to end	Night	32% 25% 29% 13% 2	660
March	1st to 10th	Night	28% 23% 32% 16% 2	800
	11th to 20th	Night	29% 21% 25% 19% 5%	800
	21st to end	Night	29% 19% 32% 17% 3 1	880
April	1st to 10th	Night	32% 16% 30% 17% 5%	800
	11th to 20th	Night	29% 15% 28% 19% 9%	791
	21st to end	Night	21% 13% 32% 29% 4 1	610
May	1st to 10th	Night	26% 11% 24% 28% 11%	600
	11th to 20th	Night	23% 9% 30% 30% 8%	498
	21st to end	Night	15% 8% 28% 29% 18% 2	433
June	1st to 10th	Night	15% 5% 30% 36% 14% 1	400
	11th to 20th	Night	16% 8% 27% 38% 11%	400
	21st to end	Night	18% 6% 28% 33% 15% 1	400
July	1st to 10th	Night	12% 4 22% 39% 20% 3	390
	11th to 20th	Night	14% 4 18% 39% 22% 3	478
	21st to end	Night	13% 3 18% 43% 21% 1	657
August	1st to 10th	Night	13% 3 18% 39% 26% 2	597
	11th to 20th	Night	16% 4 16% 32% 28% 4	594
	21st to end	Night	13% 4 21% 33% 25% 3	792
September	1st to 10th	Night	18% 6% 23% 29% 22% 3	800
	11th to 20th	Night	13% 5% 18% 34% 27% 4	800
	21st to end	Night	24% 9% 21% 26% 16% 3	800
October	1st to 10th	Night	22% 8% 23% 27% 18% 3	800
	11th to 20th	Night	26% 12% 30% 23% 7% 1	793
	21st to end	Night	34% 14% 27% 22% 4	836
November	1st to 10th	Night	23% 15% 29% 24% 8%	780
	11th to 20th	Night	33% 16% 29% 17% 4 1	800
	21st to end	Night	32% 20% 29% 15% 4	800
December	1st to 10th	Night	36% 24% 25% 11% 3	800
	11th to 20th	Night	31% 26% 26% 14% 3	800
	21st to end	Night	32% 23% 30% 14% 2	880

Page generated at 2025-10-16 01:50:29. Version ac07

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