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 2024-02-10.

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	15% 11% 5% 8% 7% 4 5% 5% 5% 7% 30%	77930
	Night	15% 12% 6% 9% 6% 4 5% 4 5% 6% 29%	81059
Transparency	Day	53% 7% 12% 18% 10% 1	77630
	Night	56% 7% 12% 17% 8% 1	80880
Seeing	Day	20% 15% 30% 22% 10% 4	14540
	Night	20% 12% 31% 27% 10% 1	24441

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% 20% 11% 15% 8% 4 5% 3 4 4 13%	2527
	11th to 20th	Day	14% 16% 7% 15% 14% 9% 8% 3 3 4 6%	2530
	21st to end	Day	19% 19% 13% 12% 7% 3 4 4 4 4 11%	2783
February	1st to 10th	Day	11% 15% 7% 13% 14% 5% 5% 4 4 4 17%	1669
	11th to 20th	Day	12% 14% 8% 13% 12% 4 4 5% 4 4 19%	1721
	21st to end	Day	12% 19% 9% 13% 9% 3 4 3 3 5% 20%	1480
March	1st to 10th	Day	14% 11% 6% 8% 10% 4 5% 5% 4 5% 27%	1800
	11th to 20th	Day	13% 11% 7% 9% 6% 3 5% 5% 5% 5% 31%	1952
	21st to end	Day	17% 14% 4 8% 7% 3 5% 4 5% 5% 30%	2214
April	1st to 10th	Day	18% 15% 6% 7% 7% 4 3 4 4 6% 27%	2160
	11th to 20th	Day	20% 13% 3 5% 4 3 4 4 5% 5% 34%	2248
	21st to end	Day	16% 12% 4 8% 6% 3 4 4 5% 6% 31%	2340
May	1st to 10th	Day	17% 9% 3 7% 6% 2 5% 5% 5% 7% 34%	2340
	11th to 20th	Day	17% 7% 3 7% 6% 3 5% 4 5% 6% 38%	2319
	21st to end	Day	12% 6% 3 5% 5% 3 5% 5% 6% 8% 42%	2725
June	1st to 10th	Day	13% 6% 3 5% 5% 3 5% 4 6% 8% 40%	2636
	11th to 20th	Day	14% 6% 2 5% 6% 3 5% 5% 6% 9% 40%	2700
	21st to end	Day	13% 5% 3 6% 6% 4 5% 6% 6% 8% 38%	2623
July	1st to 10th	Day	7% 5% 2 5% 5% 4 5% 5% 6% 9% 47%	2520
	11th to 20th	Day	11% 5% 2 5% 6% 4 5% 5% 7% 9% 41%	2520
	21st to end	Day	9% 6% 3 4 6% 4 5% 6% 7% 9% 41%	2743
August	1st to 10th	Day	9% 5% 3 6% 6% 4 6% 7% 8% 9% 38%	2360
	11th to 20th	Day	10% 7% 2 6% 6% 4 5% 5% 6% 8% 42%	2303
	21st to end	Day	15% 7% 2 6% 5% 3 4 5% 5% 7% 42%	2502
September	1st to 10th	Day	14% 6% 3 5% 5% 3 5% 5% 7% 8% 39%	2107
	11th to 20th	Day	13% 6% 2 4 5% 3 5% 4 6% 8% 44%	1980
	21st to end	Day	16% 7% 3 6% 6% 4 5% 5% 6% 9% 34%	1980
October	1st to 10th	Day	19% 8% 3 7% 5% 3 4 4 5% 6% 35%	1972
	11th to 20th	Day	23% 15% 5% 8% 7% 3 4 4 5% 6% 21%	1733
	21st to end	Day	23% 15% 4 9% 7% 4 4 4 5% 7% 18%	1782
November	1st to 10th	Day	16% 14% 4 7% 5% 3 4 5% 5% 8% 28%	1672
	11th to 20th	Day	15% 17% 7% 10% 7% 3 5% 5% 4 6% 20%	1710
	21st to end	Day	19% 20% 7% 11% 6% 3 4 3 3 5% 17%	1596
December	1st to 10th	Day	15% 21% 10% 13% 7% 3 5% 3 4 5% 14%	1349
	11th to 20th	Day	17% 19% 8% 14% 8% 4 4 4 4 4 15%	1675
	21st to end	Day	23% 24% 11% 14% 7% 3 4 3 2 3 7%	2659
January	1st to 10th	Night	15% 17% 11% 16% 8% 4 4 3 4 4 16%	4428
	11th to 20th	Night	12% 15% 8% 15% 13% 8% 7% 4 3 4 9%	4440
	21st to end	Night	16% 20% 10% 16% 9% 4 5% 4 4 4 10%	4884
February	1st to 10th	Night	11% 13% 8% 13% 12% 5% 5% 6% 4 4 17%	2494
	11th to 20th	Night	14% 14% 6% 12% 9% 5% 6% 5% 5% 5% 20%	2122
	21st to end	Night	16% 15% 6% 12% 8% 4 5% 4 3 5% 23%	1776
March	1st to 10th	Night	13% 10% 5% 9% 6% 4 4 4 5% 4 36%	2160
	11th to 20th	Night	13% 11% 5% 8% 5% 3 3 5% 4 5% 36%	2008
	21st to end	Night	16% 10% 5% 6% 6% 3 5% 4 4 5% 35%	2156
April	1st to 10th	Night	17% 12% 6% 7% 5% 3 4 5% 6% 7% 30%	1800
	11th to 20th	Night	19% 11% 3 6% 5% 2 4 4 5% 6% 36%	1661
	21st to end	Night	15% 10% 4 6% 5% 4 4 4 5% 6% 38%	1620
May	1st to 10th	Night	15% 7% 3 7% 6% 4 5% 5% 5% 8% 35%	1620
	11th to 20th	Night	14% 8% 3 8% 6% 3 4 6% 5% 6% 37%	1571
	21st to end	Night	13% 5% 1 4 4 2 4 6% 5% 8% 46%	1551
June	1st to 10th	Night	14% 5% 3 4 5% 3 5% 5% 5% 9% 43%	1314
	11th to 20th	Night	8% 6% 2 5% 5% 3 5% 5% 6% 9% 46%	1260
	21st to end	Night	10% 7% 3 4 5% 3 4 4 6% 8% 46%	1330
July	1st to 10th	Night	7% 3 2 4 4 3 4 5% 6% 12% 52%	1440
	11th to 20th	Night	6% 4 2 5% 5% 3 5% 5% 6% 8% 50%	1440
	21st to end	Night	9% 5% 2 6% 4 2 4 5% 6% 9% 48%	1575
August	1st to 10th	Night	8% 4 2 4 5% 3 5% 5% 6% 8% 49%	1576
	11th to 20th	Night	9% 5% 1 4 4 3 4 5% 6% 8% 52%	1598
	21st to end	Night	12% 6% 2 4 4 3 5% 5% 6% 8% 46%	1850
September	1st to 10th	Night	11% 5% 2 5% 5% 2 4 4 6% 6% 50%	1834
	11th to 20th	Night	12% 6% 3 4 3 2 4 4 6% 7% 49%	1980
	21st to end	Night	16% 7% 2 6% 5% 3 4 4 5% 8% 39%	1980
October	1st to 10th	Night	18% 8% 3 5% 4 3 3 3 4 6% 42%	1988
	11th to 20th	Night	20% 14% 3 7% 5% 3 3 4 5% 7% 29%	2222
	21st to end	Night	25% 13% 4 7% 5% 2 4 4 4 6% 26%	2574
November	1st to 10th	Night	12% 11% 4 7% 6% 4 4 5% 5% 8% 33%	2406
	11th to 20th	Night	14% 17% 6% 9% 8% 4 5% 4 4 5% 23%	2470
	21st to end	Night	18% 17% 8% 10% 6% 3 5% 4 4 6% 19%	2580
December	1st to 10th	Night	14% 16% 9% 13% 7% 4 6% 5% 4 6% 15%	2826
	11th to 20th	Night	14% 18% 7% 15% 8% 4 6% 4 4 5% 14%	3522
	21st to end	Night	24% 24% 8% 11% 5% 3 4 3 3 3 11%	5003

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	74% 9% 9% 6% 3	2528
	11th to 20th	Day	83% 6% 6% 5% 1	2530
	21st to end	Day	76% 6% 11% 4 2	2783
February	1st to 10th	Day	71% 5% 8% 13% 3	1669
	11th to 20th	Day	67% 7% 9% 11% 6% 1	1731
	21st to end	Day	67% 5% 9% 14% 4	1480
March	1st to 10th	Day	57% 6% 11% 17% 8% 1	1800
	11th to 20th	Day	53% 6% 11% 19% 8% 3	1952
	21st to end	Day	56% 5% 10% 19% 10% 1	2214
April	1st to 10th	Day	59% 5% 10% 16% 9%	2160
	11th to 20th	Day	52% 5% 9% 18% 14% 2	2248
	21st to end	Day	52% 6% 12% 15% 13% 3	2340
May	1st to 10th	Day	49% 6% 9% 22% 11% 2	2340
	11th to 20th	Day	46% 6% 10% 21% 14% 2	2323
	21st to end	Day	40% 7% 14% 24% 14% 2	2725
June	1st to 10th	Day	40% 6% 14% 25% 14% 2	2636
	11th to 20th	Day	39% 8% 12% 23% 17% 1	2700
	21st to end	Day	41% 7% 14% 23% 14% 1	2623
July	1st to 10th	Day	32% 7% 15% 25% 19% 2	2451
	11th to 20th	Day	36% 9% 12% 26% 16% 1	2445
	21st to end	Day	36% 8% 15% 22% 17% 2	2591
August	1st to 10th	Day	38% 9% 14% 26% 11% 1	2345
	11th to 20th	Day	38% 8% 15% 25% 13% 2	2303
	21st to end	Day	40% 7% 14% 23% 14% 2	2502
September	1st to 10th	Day	40% 8% 13% 22% 14% 2	2107
	11th to 20th	Day	37% 6% 15% 29% 12% 1	1980
	21st to end	Day	45% 7% 16% 25% 8%	1980
October	1st to 10th	Day	48% 6% 12% 22% 11% 1	1972
	11th to 20th	Day	64% 6% 11% 16% 4	1733
	21st to end	Day	66% 6% 12% 11% 5%	1782
November	1st to 10th	Day	54% 7% 11% 20% 7%	1672
	11th to 20th	Day	63% 7% 15% 10% 5%	1710
	21st to end	Day	70% 5% 12% 10% 3	1596
December	1st to 10th	Day	74% 6% 8% 9% 1	1349
	11th to 20th	Day	73% 5% 10% 9% 2	1671
	21st to end	Day	83% 4 6% 4 2	2659
January	1st to 10th	Night	71% 7% 8% 11% 3	4428
	11th to 20th	Night	78% 7% 7% 6% 2	4440
	21st to end	Night	77% 8% 8% 6% 1	4884
February	1st to 10th	Night	68% 6% 8% 13% 5% 1	2494
	11th to 20th	Night	65% 5% 10% 15% 5% 1	2123
	21st to end	Night	64% 6% 10% 14% 7%	1776
March	1st to 10th	Night	50% 5% 12% 22% 10% 1	2160
	11th to 20th	Night	49% 6% 11% 20% 12% 2	2008
	21st to end	Night	51% 5% 11% 21% 11% 1	2156
April	1st to 10th	Night	52% 6% 10% 19% 12% 1	1800
	11th to 20th	Night	48% 6% 9% 21% 14% 2	1661
	21st to end	Night	46% 6% 12% 18% 15% 2	1620
May	1st to 10th	Night	46% 6% 12% 21% 12% 3	1620
	11th to 20th	Night	46% 6% 10% 22% 14% 2	1572
	21st to end	Night	35% 7% 16% 25% 15% 2	1552
June	1st to 10th	Night	38% 6% 11% 25% 19% 1	1314
	11th to 20th	Night	34% 8% 14% 25% 17% 2	1260
	21st to end	Night	35% 8% 13% 26% 17% 2	1330
July	1st to 10th	Night	25% 7% 15% 32% 19% 3	1400
	11th to 20th	Night	29% 7% 16% 28% 19% 1	1392
	21st to end	Night	31% 8% 16% 27% 16% 1	1487
August	1st to 10th	Night	31% 8% 19% 29% 13% 1	1567
	11th to 20th	Night	29% 7% 18% 30% 16% 1	1598
	21st to end	Night	35% 8% 15% 26% 16% 1	1850
September	1st to 10th	Night	32% 8% 13% 28% 17% 2	1834
	11th to 20th	Night	34% 6% 15% 33% 12%	1980
	21st to end	Night	43% 8% 15% 26% 8% 1	1980
October	1st to 10th	Night	43% 5% 13% 25% 12% 1	1988
	11th to 20th	Night	55% 6% 12% 20% 6% 1	2222
	21st to end	Night	60% 6% 12% 15% 7%	2574
November	1st to 10th	Night	49% 7% 14% 21% 9% 1	2406
	11th to 20th	Night	62% 6% 13% 13% 6%	2470
	21st to end	Night	67% 7% 14% 11% 2 1	2580
December	1st to 10th	Night	70% 7% 10% 11% 3	2826
	11th to 20th	Night	71% 8% 11% 7% 3	3525
	21st to end	Night	79% 5% 8% 5% 2	5003

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	24% 19% 36% 15% 5%	270
	11th to 20th	Day	26% 16% 42% 13% 3	270
	21st to end	Day	28% 15% 38% 14% 4	297
February	1st to 10th	Day	21% 31% 34% 9% 3 2	267
	11th to 20th	Day	23% 28% 39% 9% 1	240
	21st to end	Day	30% 28% 36% 5% 1	198
March	1st to 10th	Day	27% 29% 34% 10% 1	240
	11th to 20th	Day	22% 17% 36% 17% 7% 1	392
	21st to end	Day	30% 14% 27% 22% 6% 1	462
April	1st to 10th	Day	25% 18% 34% 17% 5% 1	420
	11th to 20th	Day	30% 19% 26% 15% 7% 3	412
	21st to end	Day	24% 18% 26% 22% 8% 2	420
May	1st to 10th	Day	24% 20% 30% 16% 7% 4	423
	11th to 20th	Day	18% 14% 30% 27% 6% 5%	465
	21st to end	Day	16% 13% 30% 27% 11% 4	679
June	1st to 10th	Day	13% 15% 33% 26% 10% 3	630
	11th to 20th	Day	16% 13% 31% 26% 12% 3	630
	21st to end	Day	15% 12% 31% 28% 11% 3	630
July	1st to 10th	Day	8% 8% 31% 29% 18% 7%	621
	11th to 20th	Day	11% 10% 29% 28% 16% 6%	618
	21st to end	Day	10% 7% 32% 30% 15% 5%	684
August	1st to 10th	Day	10% 5% 26% 29% 19% 11%	479
	11th to 20th	Day	11% 8% 19% 35% 16% 11%	439
	21st to end	Day	19% 8% 24% 26% 17% 5%	495
September	1st to 10th	Day	16% 11% 25% 25% 16% 8%	450
	11th to 20th	Day	12% 10% 23% 28% 18% 9%	450
	21st to end	Day	20% 13% 20% 28% 14% 6%	450
October	1st to 10th	Day	24% 15% 27% 18% 13% 2	450
	11th to 20th	Day	31% 17% 33% 16% 2 1	383
	21st to end	Day	33% 23% 30% 9% 4 1	297
November	1st to 10th	Day	27% 20% 31% 17% 4 1	270
	11th to 20th	Day	26% 22% 37% 12% 3	270
	21st to end	Day	24% 28% 33% 13% 2	216
December	1st to 10th	Day	32% 20% 31% 9% 7% 2	180
	11th to 20th	Day	29% 26% 31% 12% 2	180
	21st to end	Day	29% 27% 32% 9% 2	263
January	1st to 10th	Night	20% 19% 35% 20% 6% 1	950
	11th to 20th	Night	25% 17% 33% 21% 5% 1	950
	21st to end	Night	21% 11% 38% 24% 5% 1	1045
February	1st to 10th	Night	19% 16% 38% 22% 4	789
	11th to 20th	Night	23% 19% 32% 22% 4	703
	21st to end	Night	27% 19% 32% 20% 2	592
March	1st to 10th	Night	18% 16% 35% 23% 7% 1	720
	11th to 20th	Night	21% 16% 34% 22% 6%	720
	21st to end	Night	22% 13% 32% 26% 6% 1	770
April	1st to 10th	Night	21% 16% 34% 24% 5% 1	540
	11th to 20th	Night	22% 14% 32% 25% 6% 1	533
	21st to end	Night	19% 10% 34% 30% 6% 1	540
May	1st to 10th	Night	17% 10% 35% 30% 8% 1	540
	11th to 20th	Night	17% 11% 31% 31% 11%	531
	21st to end	Night	15% 6% 28% 35% 15% 1	584
June	1st to 10th	Night	17% 5% 30% 37% 11%	414
	11th to 20th	Night	11% 7% 31% 41% 11%	360
	21st to end	Night	10% 6% 29% 37% 16% 2	430
July	1st to 10th	Night	8% 3 21% 45% 22% 2	525
	11th to 20th	Night	7% 5% 25% 37% 24% 2	522
	21st to end	Night	11% 3 26% 38% 21% 1	591
August	1st to 10th	Night	11% 2 23% 41% 22% 1	537
	11th to 20th	Night	9% 4 19% 35% 30% 3	534
	21st to end	Night	15% 4 22% 39% 19% 1	594
September	1st to 10th	Night	13% 3 26% 32% 22% 4	574
	11th to 20th	Night	14% 6% 23% 33% 20% 4	720
	21st to end	Night	19% 9% 23% 31% 15% 4	720
October	1st to 10th	Night	22% 9% 26% 30% 13% 1	720
	11th to 20th	Night	27% 14% 29% 23% 7%	720
	21st to end	Night	32% 13% 29% 20% 6%	792
November	1st to 10th	Night	19% 15% 34% 24% 7% 1	740
	11th to 20th	Night	23% 17% 37% 19% 4	760
	21st to end	Night	27% 14% 37% 18% 3	760
December	1st to 10th	Night	24% 16% 34% 21% 4	926
	11th to 20th	Night	24% 17% 38% 16% 4 1	950
	21st to end	Night	29% 16% 34% 19% 2	1045

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