Hodges and North Wildlife Area
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Hodges and North Wildlife Area clear sky chart from 2005-11-06 to 2024-01-17.

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% 8% 4 7% 6% 3 5% 5% 5% 7% 37%	74765
	Night	13% 8% 3 7% 5% 3 4 4 5% 6% 41%	75088
Transparency	Day	45% 6% 13% 22% 12% 1	74469
	Night	44% 5% 13% 23% 14% 2	74904
Seeing	Day	16% 9% 29% 27% 14% 4	14717
	Night	16% 9% 31% 31% 11% 1	24720

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	10% 12% 7% 9% 9% 5% 6% 6% 5% 5% 26%	1517
	11th to 20th	Day	12% 13% 6% 12% 6% 5% 5% 5% 6% 6% 25%	1540
	21st to end	Day	13% 13% 7% 11% 8% 4 6% 5% 5% 6% 22%	1782
February	1st to 10th	Day	11% 12% 6% 9% 8% 4 5% 5% 4 7% 28%	1620
	11th to 20th	Day	14% 10% 6% 6% 5% 4 6% 6% 5% 6% 33%	1574
	21st to end	Day	15% 10% 4 7% 8% 3 5% 5% 5% 7% 31%	1476
March	1st to 10th	Day	15% 10% 5% 9% 6% 3 4 4 4 7% 33%	1894
	11th to 20th	Day	15% 8% 3 8% 6% 3 4 5% 5% 9% 34%	1980
	21st to end	Day	20% 12% 4 7% 5% 3 5% 4 5% 6% 27%	2235
April	1st to 10th	Day	19% 11% 4 7% 5% 3 4 5% 5% 6% 31%	2160
	11th to 20th	Day	17% 11% 3 7% 5% 4 4 5% 5% 8% 32%	2134
	21st to end	Day	23% 8% 2 6% 5% 3 4 5% 5% 6% 33%	2207
May	1st to 10th	Day	18% 8% 3 7% 7% 3 6% 5% 7% 7% 29%	2420
	11th to 20th	Day	17% 9% 3 7% 5% 3 4 3 5% 6% 37%	2479
	21st to end	Day	16% 6% 3 6% 6% 4 5% 5% 6% 8% 36%	2725
June	1st to 10th	Day	12% 4 2 4 5% 3 6% 5% 6% 9% 43%	2520
	11th to 20th	Day	11% 5% 3 5% 5% 3 5% 5% 5% 7% 46%	2520
	21st to end	Day	12% 5% 3 5% 6% 4 5% 6% 7% 9% 39%	2520
July	1st to 10th	Day	8% 5% 2 5% 5% 3 5% 5% 7% 8% 47%	2520
	11th to 20th	Day	6% 4 2 5% 5% 4 6% 5% 7% 9% 47%	2520
	21st to end	Day	7% 3 2 4 5% 2 5% 6% 7% 10% 47%	2677
August	1st to 10th	Day	8% 5% 2 5% 6% 4 5% 7% 8% 9% 43%	2328
	11th to 20th	Day	11% 5% 3 5% 5% 3 5% 5% 6% 9% 44%	2292
	21st to end	Day	10% 4 2 5% 5% 3 4 5% 5% 7% 50%	2376
September	1st to 10th	Day	14% 4 2 5% 4 3 4 4 4 7% 49%	2160
	11th to 20th	Day	11% 4 2 4 5% 3 5% 6% 4 7% 50%	2160
	21st to end	Day	13% 4 3 5% 5% 3 4 5% 5% 7% 46%	1896
October	1st to 10th	Day	15% 8% 2 5% 5% 2 4 3 5% 6% 44%	1800
	11th to 20th	Day	18% 8% 2 6% 5% 3 4 3 5% 7% 39%	1800
	21st to end	Day	17% 9% 4 5% 5% 2 4 4 5% 6% 41%	1959
November	1st to 10th	Day	13% 7% 3 5% 5% 3 4 4 5% 7% 46%	1672
	11th to 20th	Day	14% 10% 5% 8% 6% 4 4 4 5% 6% 35%	1561
	21st to end	Day	15% 11% 4 7% 5% 2 4 4 5% 6% 38%	1520
December	1st to 10th	Day	13% 12% 4 11% 7% 4 5% 4 5% 5% 30%	1520
	11th to 20th	Day	14% 11% 5% 9% 7% 3 5% 4 5% 7% 31%	1918
	21st to end	Day	21% 19% 8% 12% 6% 3 4 3 3 5% 17%	2783
January	1st to 10th	Night	9% 11% 5% 8% 6% 4 5% 4 4 6% 36%	2648
	11th to 20th	Night	12% 12% 6% 12% 7% 4 4 4 5% 8% 26%	2563
	21st to end	Night	13% 12% 5% 11% 7% 3 5% 4 5% 7% 29%	2574
February	1st to 10th	Night	11% 12% 5% 9% 8% 3 5% 4 4 6% 32%	2340
	11th to 20th	Night	11% 10% 3 7% 6% 4 4 4 4 6% 40%	2273
	21st to end	Night	14% 10% 4 7% 7% 3 5% 4 4 6% 37%	1779
March	1st to 10th	Night	16% 10% 4 6% 4 3 4 3 4 6% 41%	2080
	11th to 20th	Night	13% 8% 3 7% 5% 4 5% 3 5% 7% 41%	1980
	21st to end	Night	20% 10% 4 8% 6% 3 5% 4 5% 6% 29%	2120
April	1st to 10th	Night	17% 8% 4 6% 4 3 3 4 4 6% 41%	1800
	11th to 20th	Night	16% 9% 3 5% 6% 3 4 5% 5% 6% 38%	1775
	21st to end	Night	18% 7% 2 6% 5% 3 4 4 5% 6% 40%	1750
May	1st to 10th	Night	16% 6% 3 7% 5% 3 5% 5% 5% 6% 39%	1540
	11th to 20th	Night	14% 7% 3 6% 5% 3 4 4 6% 8% 39%	1416
	21st to end	Night	12% 6% 2 5% 6% 3 5% 5% 4 7% 44%	1551
June	1st to 10th	Night	8% 5% 2 5% 5% 2 5% 5% 7% 8% 49%	1440
	11th to 20th	Night	9% 6% 2 5% 5% 3 4 5% 8% 9% 45%	1440
	21st to end	Night	11% 4 2 4 4 2 4 6% 5% 8% 49%	1440
July	1st to 10th	Night	6% 4 2 3 3 3 4 5% 6% 9% 55%	1440
	11th to 20th	Night	6% 3 1 3 3 2 4 4 4 9% 59%	1440
	21st to end	Night	5% 3 2 5% 5% 3 4 4 6% 8% 55%	1637
August	1st to 10th	Night	5% 4 2 5% 4 3 5% 5% 7% 9% 53%	1611
	11th to 20th	Night	9% 4 2 4 5% 3 4 3 5% 8% 54%	1608
	21st to end	Night	9% 4 2 4 4 2 4 3 4 6% 57%	1980
September	1st to 10th	Night	10% 4 2 6% 5% 2 3 3 5% 5% 53%	1800
	11th to 20th	Night	12% 4 2 4 4 3 4 3 3 7% 55%	1800
	21st to end	Night	9% 5% 2 4 4 2 4 4 4 6% 56%	2042
October	1st to 10th	Night	13% 5% 3 5% 4 2 3 3 3 7% 52%	2160
	11th to 20th	Night	16% 8% 3 5% 5% 2 3 4 5% 5% 45%	2160
	21st to end	Night	17% 8% 4 5% 5% 3 4 4 5% 5% 40%	2395
November	1st to 10th	Night	11% 6% 3 5% 3 2 3 4 4 6% 51%	2406
	11th to 20th	Night	13% 9% 5% 7% 5% 3 4 5% 4 6% 39%	2617
	21st to end	Night	16% 8% 3 6% 4 3 4 4 4 6% 41%	2660
December	1st to 10th	Night	12% 10% 5% 9% 6% 4 5% 6% 5% 7% 32%	2660
	11th to 20th	Night	14% 11% 4 8% 7% 3 5% 4 5% 7% 32%	3279
	21st to end	Night	21% 16% 6% 11% 6% 3 4 4 4 5% 19%	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	58% 6% 13% 14% 9%	1518
	11th to 20th	Day	59% 4 13% 16% 7% 1	1540
	21st to end	Day	62% 5% 13% 13% 7%	1782
February	1st to 10th	Day	55% 5% 15% 17% 7% 1	1620
	11th to 20th	Day	50% 6% 12% 23% 8% 1	1583
	21st to end	Day	53% 6% 12% 18% 9% 2	1476
March	1st to 10th	Day	51% 5% 15% 20% 8% 1	1894
	11th to 20th	Day	48% 6% 13% 23% 10%	1980
	21st to end	Day	57% 6% 10% 19% 6% 1	2235
April	1st to 10th	Day	53% 5% 12% 22% 8%	2160
	11th to 20th	Day	50% 6% 12% 19% 11% 1	2134
	21st to end	Day	50% 5% 12% 20% 10% 2	2207
May	1st to 10th	Day	51% 8% 14% 19% 8% 1	2420
	11th to 20th	Day	48% 5% 12% 23% 11% 1	2483
	21st to end	Day	45% 7% 13% 20% 13% 2	2725
June	1st to 10th	Day	35% 8% 15% 26% 15% 1	2520
	11th to 20th	Day	36% 7% 13% 22% 20% 2	2520
	21st to end	Day	40% 8% 15% 23% 13% 1	2520
July	1st to 10th	Day	34% 7% 13% 30% 14% 2	2451
	11th to 20th	Day	32% 9% 17% 25% 15% 3	2445
	21st to end	Day	28% 8% 19% 27% 15% 2	2528
August	1st to 10th	Day	35% 9% 14% 29% 11% 2	2314
	11th to 20th	Day	36% 8% 13% 28% 14% 1	2292
	21st to end	Day	33% 7% 11% 28% 19% 2	2376
September	1st to 10th	Day	36% 6% 12% 26% 18% 3	2160
	11th to 20th	Day	33% 6% 13% 32% 15% 1	2160
	21st to end	Day	36% 6% 11% 29% 16% 1	1896
October	1st to 10th	Day	41% 5% 11% 27% 16% 1	1800
	11th to 20th	Day	45% 5% 11% 22% 15% 2	1800
	21st to end	Day	45% 4 14% 22% 13% 1	1959
November	1st to 10th	Day	38% 6% 12% 27% 14% 3	1672
	11th to 20th	Day	50% 5% 13% 20% 11% 1	1561
	21st to end	Day	47% 6% 16% 23% 8% 1	1520
December	1st to 10th	Day	56% 6% 12% 18% 8% 2	1520
	11th to 20th	Day	53% 5% 18% 15% 8% 1	1915
	21st to end	Day	72% 4 9% 11% 4	2783
January	1st to 10th	Night	49% 5% 12% 20% 13% 1	2648
	11th to 20th	Night	58% 4 15% 15% 7%	2563
	21st to end	Night	56% 4 13% 17% 8% 1	2574
February	1st to 10th	Night	54% 5% 11% 19% 10% 1	2340
	11th to 20th	Night	45% 5% 12% 24% 12% 2	2274
	21st to end	Night	49% 5% 12% 19% 13% 3	1779
March	1st to 10th	Night	46% 4 12% 26% 10% 1	2080
	11th to 20th	Night	44% 5% 13% 22% 15% 2	1980
	21st to end	Night	56% 5% 13% 17% 8% 1	2120
April	1st to 10th	Night	45% 5% 11% 24% 14% 2	1800
	11th to 20th	Night	45% 6% 10% 21% 15% 3	1775
	21st to end	Night	44% 6% 12% 24% 13% 2	1750
May	1st to 10th	Night	44% 7% 12% 21% 15% 1	1540
	11th to 20th	Night	43% 6% 12% 25% 12% 2	1417
	21st to end	Night	39% 6% 13% 23% 16% 2	1552
June	1st to 10th	Night	31% 8% 15% 27% 15% 3	1440
	11th to 20th	Night	34% 7% 12% 22% 21% 4	1440
	21st to end	Night	31% 7% 15% 27% 16% 3	1440
July	1st to 10th	Night	25% 8% 16% 30% 18% 4	1400
	11th to 20th	Night	23% 7% 18% 32% 17% 4	1392
	21st to end	Night	26% 6% 16% 29% 19% 3	1546
August	1st to 10th	Night	26% 9% 16% 32% 15% 2	1601
	11th to 20th	Night	29% 6% 15% 31% 17% 2	1608
	21st to end	Night	29% 6% 12% 26% 22% 6%	1980
September	1st to 10th	Night	32% 5% 11% 26% 24% 2	1800
	11th to 20th	Night	31% 4 10% 34% 19% 2	1800
	21st to end	Night	29% 5% 11% 31% 22% 2	2042
October	1st to 10th	Night	35% 4 11% 25% 22% 3	2160
	11th to 20th	Night	41% 4 11% 23% 18% 2	2160
	21st to end	Night	45% 5% 12% 22% 15% 2	2395
November	1st to 10th	Night	35% 5% 14% 25% 18% 4	2406
	11th to 20th	Night	46% 6% 13% 23% 11% 1	2617
	21st to end	Night	45% 4 13% 27% 10% 1	2660
December	1st to 10th	Night	51% 5% 13% 21% 9%	2660
	11th to 20th	Night	51% 6% 13% 22% 6% 1	3281
	21st to end	Night	68% 5% 8% 13% 5%	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	19% 12% 35% 25% 8% 2	270
	11th to 20th	Day	24% 9% 40% 22% 5%	258
	21st to end	Day	18% 16% 33% 26% 6% 2	264
February	1st to 10th	Day	16% 19% 38% 23% 3	240
	11th to 20th	Day	20% 17% 35% 20% 8% 1	240
	21st to end	Day	22% 15% 39% 20% 4	198
March	1st to 10th	Day	13% 18% 44% 17% 6% 1	240
	11th to 20th	Day	23% 11% 35% 21% 9% 2	240
	21st to end	Day	34% 12% 27% 18% 7% 2	321
April	1st to 10th	Day	24% 13% 38% 19% 5% 1	420
	11th to 20th	Day	23% 16% 29% 21% 9% 1	412
	21st to end	Day	25% 14% 33% 17% 9% 2	467
May	1st to 10th	Day	23% 13% 31% 24% 8% 1	603
	11th to 20th	Day	22% 12% 27% 24% 12% 3	625
	21st to end	Day	17% 8% 28% 27% 16% 4	679
June	1st to 10th	Day	10% 4 27% 32% 21% 6%	630
	11th to 20th	Day	12% 7% 26% 36% 17% 3	630
	21st to end	Day	11% 7% 33% 31% 14% 5%	630
July	1st to 10th	Day	8% 3 19% 33% 24% 13%	621
	11th to 20th	Day	8% 2 27% 33% 24% 6%	618
	21st to end	Day	6% 3 24% 36% 26% 5%	684
August	1st to 10th	Day	8% 3 22% 31% 28% 8%	626
	11th to 20th	Day	12% 4 18% 31% 24% 10%	606
	21st to end	Day	9% 4 24% 33% 24% 6%	495
September	1st to 10th	Day	15% 6% 22% 30% 21% 6%	450
	11th to 20th	Day	9% 3 27% 36% 20% 6%	450
	21st to end	Day	15% 11% 29% 28% 15% 3	316
October	1st to 10th	Day	19% 8% 31% 24% 14% 3	270
	11th to 20th	Day	24% 20% 35% 14% 8%	270
	21st to end	Day	23% 14% 35% 19% 6% 3	297
November	1st to 10th	Day	16% 10% 36% 28% 6% 3	270
	11th to 20th	Day	17% 20% 30% 23% 7% 1	270
	21st to end	Day	24% 11% 36% 24% 5%	270
December	1st to 10th	Day	12% 16% 41% 22% 7% 2	270
	11th to 20th	Day	18% 14% 34% 23% 9% 1	270
	21st to end	Day	28% 14% 39% 16% 2	297
January	1st to 10th	Night	14% 13% 37% 27% 7%	950
	11th to 20th	Night	17% 13% 35% 29% 6%	935
	21st to end	Night	19% 10% 35% 29% 5%	990
February	1st to 10th	Night	18% 13% 35% 28% 5% 1	900
	11th to 20th	Night	16% 11% 38% 28% 6%	879
	21st to end	Night	19% 13% 37% 27% 4 1	595
March	1st to 10th	Night	20% 12% 35% 26% 6% 1	640
	11th to 20th	Night	19% 9% 34% 30% 9% 1	540
	21st to end	Night	24% 11% 34% 24% 6% 1	594
April	1st to 10th	Night	20% 13% 41% 24% 3	540
	11th to 20th	Night	19% 13% 35% 25% 7% 1	533
	21st to end	Night	21% 9% 33% 28% 8% 1	540
May	1st to 10th	Night	18% 8% 33% 31% 9% 1	540
	11th to 20th	Night	17% 7% 33% 34% 9% 1	531
	21st to end	Night	15% 5% 29% 34% 16% 1	584
June	1st to 10th	Night	11% 4 25% 43% 16% 1	540
	11th to 20th	Night	10% 4 31% 43% 12% 1	540
	21st to end	Night	13% 3 26% 41% 17% 1	540
July	1st to 10th	Night	6% 2 13% 44% 33% 3	525
	11th to 20th	Night	7% 2 19% 42% 27% 3	522
	21st to end	Night	5% 2 19% 49% 24% 2	591
August	1st to 10th	Night	4 2 16% 47% 29% 2	537
	11th to 20th	Night	10% 3 16% 39% 27% 5%	534
	21st to end	Night	9% 2 20% 42% 24% 3	594
September	1st to 10th	Night	12% 4 20% 39% 21% 4	540
	11th to 20th	Night	13% 3 21% 38% 24% 2	540
	21st to end	Night	10% 7% 28% 36% 16% 2	652
October	1st to 10th	Night	15% 6% 30% 34% 14% 2	720
	11th to 20th	Night	19% 12% 32% 28% 9%	720
	21st to end	Night	22% 11% 31% 28% 7%	792
November	1st to 10th	Night	15% 9% 38% 29% 9% 1	740
	11th to 20th	Night	16% 12% 40% 24% 7%	907
	21st to end	Night	19% 11% 36% 25% 8%	950
December	1st to 10th	Night	18% 11% 39% 26% 5% 1	950
	11th to 20th	Night	22% 8% 35% 28% 7% 1	950
	21st to end	Night	25% 12% 35% 23% 5%	1045

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