Higgins Lake
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Higgins Lake clear sky chart from 2005-11-06 to 2026-07-16.

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% 11% 4 10% 6% 5% 5% 4 5% 6% 31%	137148
	Night	13% 13% 5% 11% 6% 5% 4 3 5% 6% 29%	135769
Transparency	Day	52% 6% 10% 20% 12% 1	140660
	Night	54% 5% 11% 18% 10% 1	140334
Seeing	Day	20% 16% 30% 21% 9% 3	17912
	Night	20% 12% 31% 26% 9% 1	27609

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% 19% 9% 21% 9% 5% 4 2 4 4 11%	4691
	11th to 20th	Day	11% 16% 8% 23% 11% 10% 6% 2 3 3 7%	4710
	21st to end	Day	11% 14% 9% 14% 8% 8% 7% 3 4 5% 16%	5156
February	1st to 10th	Day	10% 18% 6% 14% 14% 6% 4 4 4 4 17%	1856
	11th to 20th	Day	12% 15% 7% 16% 11% 6% 5% 4 4 4 18%	2017
	21st to end	Day	11% 20% 7% 15% 8% 4 4 3 4 5% 20%	1730
March	1st to 10th	Day	12% 11% 4 10% 6% 5% 5% 4 5% 6% 32%	4580
	11th to 20th	Day	13% 11% 6% 12% 5% 4 5% 4 6% 7% 26%	5032
	21st to end	Day	22% 12% 8% 12% 5% 4 4 3 4 4 23%	5690
April	1st to 10th	Day	17% 17% 4 8% 5% 5% 3 3 4 5% 27%	2520
	11th to 20th	Day	20% 14% 3 6% 4 3 4 3 5% 5% 34%	2628
	21st to end	Day	16% 12% 3 9% 5% 4 4 4 5% 7% 31%	2730
May	1st to 10th	Day	14% 8% 3 8% 6% 5% 5% 4 5% 8% 34%	7616
	11th to 20th	Day	13% 9% 3 7% 5% 4 4 3 5% 6% 39%	7686
	21st to end	Day	14% 8% 3 6% 4 4 4 3 5% 6% 44%	9047
June	1st to 10th	Day	13% 6% 3 6% 5% 5% 5% 3 7% 8% 40%	3076
	11th to 20th	Day	13% 6% 2 6% 5% 5% 5% 4 7% 8% 38%	3150
	21st to end	Day	14% 6% 2 7% 5% 5% 5% 5% 6% 8% 37%	3059
July	1st to 10th	Day	13% 7% 2 7% 4 4 4 4 6% 9% 40%	6500
	11th to 20th	Day	9% 5% 2 6% 4 5% 5% 4 7% 9% 45%	6431
	21st to end	Day	7% 5% 2 5% 4 5% 5% 4 7% 10% 44%	6924
August	1st to 10th	Day	9% 5% 2 7% 5% 6% 6% 6% 8% 9% 37%	4282
	11th to 20th	Day	13% 6% 2 6% 4 4 5% 4 6% 7% 43%	4174
	21st to end	Day	13% 6% 2 8% 4 4 5% 4 5% 7% 41%	4543
September	1st to 10th	Day	13% 7% 2 5% 5% 5% 5% 4 7% 8% 39%	2341
	11th to 20th	Day	12% 6% 2 5% 4 5% 4 4 5% 8% 46%	2200
	21st to end	Day	15% 7% 3 7% 4 5% 5% 4 6% 8% 35%	2200
October	1st to 10th	Day	17% 8% 2 7% 4 4 4 3 5% 7% 38%	2190
	11th to 20th	Day	21% 15% 4 10% 5% 4 4 3 5% 6% 23%	1925
	21st to end	Day	22% 15% 4 10% 6% 5% 4 3 5% 6% 20%	1980
November	1st to 10th	Day	16% 15% 4 7% 5% 4 4 4 5% 7% 29%	1852
	11th to 20th	Day	15% 19% 6% 11% 5% 5% 4 4 5% 6% 20%	1890
	21st to end	Day	18% 21% 7% 12% 6% 4 4 2 4 5% 16%	1764
December	1st to 10th	Day	12% 27% 10% 18% 7% 5% 4 3 3 3 9%	2383
	11th to 20th	Day	15% 22% 11% 15% 8% 4 4 3 3 3 13%	2695
	21st to end	Day	23% 25% 9% 14% 6% 4 3 2 2 3 8%	3900
January	1st to 10th	Night	13% 14% 8% 25% 9% 5% 4 2 3 3 13%	8232
	11th to 20th	Night	10% 19% 10% 18% 10% 10% 5% 3 4 3 7%	8280
	21st to end	Night	9% 16% 8% 19% 10% 7% 7% 4 5% 5% 12%	9058
February	1st to 10th	Night	10% 15% 7% 14% 12% 7% 5% 4 4 4 17%	2762
	11th to 20th	Night	12% 15% 5% 14% 8% 6% 5% 4 5% 5% 21%	2486
	21st to end	Night	14% 14% 5% 14% 7% 6% 4 4 4 5% 23%	2076
March	1st to 10th	Night	15% 10% 4 9% 7% 4 4 3 4 5% 36%	5493
	11th to 20th	Night	11% 12% 5% 9% 4 4 4 4 5% 8% 33%	5148
	21st to end	Night	19% 13% 7% 10% 4 4 3 2 4 5% 30%	5524
April	1st to 10th	Night	17% 13% 5% 8% 4 3 4 3 6% 6% 30%	2100
	11th to 20th	Night	19% 11% 4 7% 4 3 3 3 5% 5% 35%	1941
	21st to end	Night	15% 11% 3 7% 5% 4 4 3 5% 6% 37%	1890
May	1st to 10th	Night	13% 7% 2 7% 5% 5% 5% 4 5% 8% 40%	5237
	11th to 20th	Night	13% 10% 3 7% 4 4 4 3 5% 7% 41%	5161
	21st to end	Night	16% 6% 2 5% 3 3 3 4 5% 6% 47%	5139
June	1st to 10th	Night	13% 6% 2 6% 4 5% 5% 3 5% 8% 43%	1533
	11th to 20th	Night	9% 6% 2 6% 5% 4 4 4 7% 9% 43%	1470
	21st to end	Night	11% 8% 3 6% 4 4 3 4 6% 7% 44%	1552
July	1st to 10th	Night	12% 7% 2 6% 4 5% 4 4 6% 9% 41%	3698
	11th to 20th	Night	8% 6% 2 5% 3 3 4 4 6% 7% 52%	3657
	21st to end	Night	8% 5% 2 6% 3 4 4 3 6% 9% 50%	3947
August	1st to 10th	Night	10% 6% 2 6% 4 5% 5% 4 6% 7% 45%	2866
	11th to 20th	Night	14% 6% 1 4 3 3 3 3 5% 7% 50%	2875
	21st to end	Night	11% 6% 2 5% 3 4 5% 4 5% 7% 47%	3351
September	1st to 10th	Night	10% 5% 2 6% 4 3 3 3 5% 6% 51%	2038
	11th to 20th	Night	11% 6% 2 4 3 3 4 3 6% 7% 51%	2200
	21st to end	Night	16% 7% 2 7% 4 4 4 4 6% 8% 40%	2200
October	1st to 10th	Night	17% 8% 3 6% 4 3 3 2 4 6% 44%	2210
	11th to 20th	Night	19% 14% 3 8% 5% 4 3 3 5% 6% 30%	2470
	21st to end	Night	22% 13% 4 8% 4 3 4 3 4 6% 28%	2860
November	1st to 10th	Night	13% 13% 4 8% 5% 5% 4 4 5% 7% 33%	2666
	11th to 20th	Night	13% 18% 5% 10% 7% 5% 5% 3 4 5% 23%	2730
	21st to end	Night	17% 19% 7% 11% 6% 4 4 3 4 6% 17%	2852
December	1st to 10th	Night	11% 18% 7% 16% 7% 6% 6% 4 5% 6% 15%	5021
	11th to 20th	Night	12% 24% 8% 15% 7% 5% 4 3 3 4 14%	5732
	21st to end	Night	23% 25% 8% 12% 4 4 3 2 3 3 13%	7314

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	77% 6% 8% 6% 3	4692
	11th to 20th	Day	83% 4 4 6% 3	4710
	21st to end	Day	70% 5% 10% 10% 5%	5156
February	1st to 10th	Day	71% 4 8% 13% 3	1856
	11th to 20th	Day	67% 7% 9% 11% 6%	2027
	21st to end	Day	65% 5% 9% 15% 4	1730
March	1st to 10th	Day	52% 4 14% 16% 10% 3	4580
	11th to 20th	Day	55% 6% 14% 16% 8% 1	5032
	21st to end	Day	64% 5% 8% 15% 8% 1	5692
April	1st to 10th	Day	59% 5% 10% 16% 10%	2520
	11th to 20th	Day	52% 5% 9% 20% 14% 1	2628
	21st to end	Day	51% 6% 12% 16% 12% 2	2730
May	1st to 10th	Day	46% 7% 9% 22% 14% 3	7651
	11th to 20th	Day	44% 6% 9% 23% 17% 2	7690
	21st to end	Day	40% 5% 7% 21% 22% 4	9061
June	1st to 10th	Day	40% 6% 13% 25% 15% 2	3076
	11th to 20th	Day	41% 7% 12% 23% 16% 1	3150
	21st to end	Day	42% 7% 13% 23% 13% 1	3059
July	1st to 10th	Day	40% 5% 13% 25% 16% 1	6431
	11th to 20th	Day	33% 6% 11% 33% 16% 1	6356
	21st to end	Day	33% 7% 14% 29% 16% 1	6728
August	1st to 10th	Day	38% 8% 13% 27% 13% 1	4267
	11th to 20th	Day	39% 6% 12% 28% 13% 1	4213
	21st to end	Day	41% 6% 13% 27% 12% 1	4542
September	1st to 10th	Day	39% 8% 14% 24% 14% 1	2341
	11th to 20th	Day	36% 6% 15% 29% 14% 1	2200
	21st to end	Day	44% 6% 15% 24% 11%	2200
October	1st to 10th	Day	33% 4 10% 32% 18% 2	3567
	11th to 20th	Day	52% 4 9% 21% 13%	3115
	21st to end	Day	61% 5% 11% 17% 6%	3180
November	1st to 10th	Day	54% 7% 10% 21% 8%	1852
	11th to 20th	Day	63% 7% 14% 10% 5%	1890
	21st to end	Day	71% 5% 11% 10% 3	1764
December	1st to 10th	Day	82% 5% 6% 6% 1	2383
	11th to 20th	Day	78% 4 7% 10% 2	2691
	21st to end	Day	82% 3 5% 6% 4	3900
January	1st to 10th	Night	75% 5% 8% 8% 4 1	8233
	11th to 20th	Night	80% 5% 6% 6% 3	8280
	21st to end	Night	73% 6% 7% 10% 5%	9058
February	1st to 10th	Night	68% 6% 8% 14% 4 1	2762
	11th to 20th	Night	63% 5% 11% 15% 5%	2487
	21st to end	Night	63% 5% 11% 15% 6%	2076
March	1st to 10th	Night	51% 4 16% 19% 10% 1	5493
	11th to 20th	Night	47% 5% 20% 19% 8% 1	5148
	21st to end	Night	56% 5% 10% 18% 10% 1	5524
April	1st to 10th	Night	53% 6% 9% 19% 11% 1	2100
	11th to 20th	Night	50% 5% 8% 20% 15% 2	1941
	21st to end	Night	47% 6% 12% 18% 14% 2	1890
May	1st to 10th	Night	41% 6% 11% 22% 18% 3	5264
	11th to 20th	Night	42% 5% 9% 28% 15% 1	5162
	21st to end	Night	37% 5% 10% 23% 22% 4	5149
June	1st to 10th	Night	39% 6% 10% 24% 20% 2	1533
	11th to 20th	Night	36% 8% 14% 25% 16% 2	1470
	21st to end	Night	37% 7% 13% 26% 16% 2	1552
July	1st to 10th	Night	39% 5% 13% 26% 14% 4	3660
	11th to 20th	Night	31% 5% 13% 34% 18% 1	3612
	21st to end	Night	31% 6% 16% 29% 16% 1	3832
August	1st to 10th	Night	36% 7% 15% 28% 14% 1	2857
	11th to 20th	Night	33% 5% 16% 31% 14%	2902
	21st to end	Night	35% 6% 15% 26% 17% 1	3351
September	1st to 10th	Night	31% 8% 14% 29% 16% 2	2038
	11th to 20th	Night	32% 6% 15% 33% 15%	2200
	21st to end	Night	42% 7% 14% 26% 9% 1	2200
October	1st to 10th	Night	34% 4 12% 33% 16% 1	3613
	11th to 20th	Night	46% 4 10% 25% 15%	4019
	21st to end	Night	52% 4 13% 24% 7%	4610
November	1st to 10th	Night	50% 7% 13% 20% 9% 1	2666
	11th to 20th	Night	62% 6% 13% 13% 6% 1	2730
	21st to end	Night	68% 7% 13% 11% 2 1	2852
December	1st to 10th	Night	69% 7% 12% 10% 2	5021
	11th to 20th	Night	73% 6% 8% 9% 4	5735
	21st to end	Night	77% 4 7% 6% 6%	7314

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% 20% 37% 13% 4	330
	11th to 20th	Day	27% 20% 39% 11% 3	330
	21st to end	Day	28% 16% 38% 14% 4	363
February	1st to 10th	Day	22% 32% 32% 9% 3 2	330
	11th to 20th	Day	25% 27% 37% 10% 1	330
	21st to end	Day	31% 28% 36% 5% 1	273
March	1st to 10th	Day	28% 27% 35% 9% 1	330
	11th to 20th	Day	25% 20% 33% 15% 6% 1	508
	21st to end	Day	31% 17% 27% 19% 5% 1	594
April	1st to 10th	Day	28% 18% 33% 16% 4 1	540
	11th to 20th	Day	32% 21% 26% 14% 6% 2	532
	21st to end	Day	25% 18% 27% 21% 7% 2	540
May	1st to 10th	Day	23% 21% 30% 17% 6% 3	543
	11th to 20th	Day	18% 16% 31% 25% 6% 4	588
	21st to end	Day	17% 15% 31% 25% 9% 3	844
June	1st to 10th	Day	14% 16% 33% 26% 9% 3	780
	11th to 20th	Day	18% 14% 33% 23% 10% 3	780
	21st to end	Day	15% 13% 34% 27% 9% 3	780
July	1st to 10th	Day	9% 9% 33% 27% 16% 6%	771
	11th to 20th	Day	11% 10% 30% 28% 16% 6%	744
	21st to end	Day	10% 7% 31% 31% 15% 5%	794
August	1st to 10th	Day	9% 5% 26% 29% 20% 11%	562
	11th to 20th	Day	12% 7% 20% 34% 16% 10%	519
	21st to end	Day	17% 9% 24% 27% 17% 6%	583
September	1st to 10th	Day	15% 11% 25% 25% 15% 9%	530
	11th to 20th	Day	11% 9% 20% 29% 20% 11%	530
	21st to end	Day	18% 12% 21% 29% 14% 6%	530
October	1st to 10th	Day	22% 15% 28% 19% 13% 2	530
	11th to 20th	Day	28% 17% 36% 17% 3	455
	21st to end	Day	32% 20% 31% 11% 4 1	363
November	1st to 10th	Day	30% 20% 30% 15% 4 1	330
	11th to 20th	Day	29% 21% 33% 13% 3	330
	21st to end	Day	27% 25% 33% 13% 2	264
December	1st to 10th	Day	31% 22% 29% 11% 5% 2	220
	11th to 20th	Day	31% 25% 30% 11% 2	220
	21st to end	Day	33% 25% 30% 9% 2 1	322
January	1st to 10th	Night	20% 19% 36% 19% 5%	1050
	11th to 20th	Night	24% 18% 33% 20% 4	1050
	21st to end	Night	20% 13% 39% 23% 5% 1	1155
February	1st to 10th	Night	20% 15% 38% 22% 4	872
	11th to 20th	Night	23% 20% 30% 23% 3	823
	21st to end	Night	26% 18% 34% 20% 3	692
March	1st to 10th	Night	19% 16% 35% 23% 6% 1	840
	11th to 20th	Night	22% 17% 35% 21% 5%	840
	21st to end	Night	22% 14% 33% 25% 5% 1	898
April	1st to 10th	Night	22% 16% 34% 23% 4	630
	11th to 20th	Night	25% 15% 30% 23% 6% 1	623
	21st to end	Night	20% 11% 33% 30% 6% 1	630
May	1st to 10th	Night	15% 10% 36% 31% 8%	630
	11th to 20th	Night	17% 11% 31% 31% 10%	621
	21st to end	Night	16% 7% 30% 33% 14% 1	683
June	1st to 10th	Night	16% 7% 30% 37% 10%	483
	11th to 20th	Night	11% 7% 34% 38% 9%	420
	21st to end	Night	12% 7% 30% 35% 15% 1	502
July	1st to 10th	Night	10% 3 22% 44% 20% 1	615
	11th to 20th	Night	8% 5% 25% 37% 24% 2	597
	21st to end	Night	11% 3 26% 38% 21% 1	657
August	1st to 10th	Night	10% 2 23% 41% 23% 2	597
	11th to 20th	Night	11% 4 19% 36% 28% 3	594
	21st to end	Night	14% 4 22% 39% 20% 1	660
September	1st to 10th	Night	12% 4 26% 30% 24% 4	638
	11th to 20th	Night	13% 5% 21% 34% 23% 4	800
	21st to end	Night	19% 8% 23% 32% 15% 4	800
October	1st to 10th	Night	20% 9% 27% 30% 13% 1	800
	11th to 20th	Night	26% 13% 30% 24% 7%	800
	21st to end	Night	30% 14% 29% 22% 6%	880
November	1st to 10th	Night	20% 15% 34% 23% 7% 1	820
	11th to 20th	Night	23% 18% 36% 19% 4	840
	21st to end	Night	28% 15% 37% 17% 3	840
December	1st to 10th	Night	24% 17% 34% 21% 4	1024
	11th to 20th	Night	25% 17% 38% 16% 4	1050
	21st to end	Night	30% 16% 33% 19% 2	1155

Page generated at 2026-07-13 03:14:49. Version ac07

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